WorldWideScience

Sample records for superior transoesophageal imaging

  1. Modelling transoesophageal echo

    Directory of Open Access Journals (Sweden)

    Susan Wright

    2011-04-01

    Full Text Available Background: Achieving competence in transoesophageal echocardiography (TOE requires a clear understanding of cardiac anatomy as well as an ability to correlate two-dimensional (2D echocardiographic images with the three-dimensional (3D structures which they represent. Training in the technique is a long process, which may also be hampered by insufficient access to teaching in the clinical environment. These challenges would be met by a simulator which demonstrates detailed cardiac anatomy with a previously unavailable degree of accuracy. Methods: A TOE simulator system was created by collaboration with a wide range of clinical specialists and a post-production company skilled in the generation of computer graphics and special effects for the film industry. The core of the system is an animated, accurate and detailed virtual heart. Echocardiographic simulation was developed to provide a real-time display of ultrasound images alongside the 3D anatomical correlate of the imaging plane. Results: A freely interactive animated model of the heart was created as the basis for ultrasound simulation. Creation of a mannequin simulator which drives the software allowed reproduction of the practical experience of the TOE procedure. Conclusions: Partnership with groups with a wide diversity of skills can result in a simulator teaching tool of high fidelity.

  2. Transoesophageal echocardiography: What a neuroanaesthesiologist should know?

    Directory of Open Access Journals (Sweden)

    Minati Choudhury

    2015-01-01

    Full Text Available Transoesophageal echocardiography (TEE is a semi invasive imaging modality rapidly gained credence and popularity in the cardiothoracic centers worldwide by mid 1990s. It has also been found to be useful in some noncardiac surgical procedures, in particular in the management of neurosurgical patients and haemodynamically unstable patients in intensive care units (ICUs. The principal goal of basic transoesophageal echocardiographic examination encompass a broad range of anatomic imaging including the diagnosis of air embolism, causes of haemodynamic instability, ventricular size and function, volume status, and complications from invasive procedures, as well as the clinical impact or etiology of pulmonary dysfunction in ICU. TEE is relatively cheap and semi-invasive, but it should not be used as a stand-alone device but as a tool which provides data in addition to the data acquired from other forms of monitoring. The establishment of TEE in perioperative neuro anaesthetic care though recent, may result in a significant change in the role of the anaesthetsiologist who, using TEE can provide new information which may change the course and the outcome of surgical procedures.

  3. Transoesophageal echocardiography during liver transplantation

    Institute of Scientific and Technical Information of China (English)

    Lesley; De; Pietri; Federico; Mocchegiani; Chiara; Leuzzi; Roberto; Montalti; Marco; Vivarelli; Vanni; Agnoletti

    2015-01-01

    Liver transplantation(LT) has become the standard of care for patients with end stage liver disease. The allocation of organs, which prioritizes the sickest patients, has made the management of liver trans-plant candidates more complex both as regards their comorbidities and their higher risk of perioperative complications. Patients undergoing LT frequently display considerable physiological changes during the pro-cedures as a result of both the disease process and the surgery. Transoesophageal echocardiography(TEE), which visualizes dynamic cardiac function and overall contractility, has become essential for perioperative LT management and can optimize the anaesthetic management of these highly complex patients. More-over, TEE can provide useful information on volume status and the adequacy of therapeutic interventions and can diagnose early intraoperative complications, such as the embolization of large vessels or development of pulmonary hypertension. In this review, directed at clinicians who manage TEE during LT, we show why the procedure merits a place in challenging anaesthetic environment and how it can provide essential information in the perioperative management of compromised patients undergoing this very complex surgical procedure.

  4. Absolute assessment of aortic valve stenosis by planimetry using cardiovascular magnetic resonance imaging: Comparison with transoesophageal echocardiography, transthoracic echocardiography, and cardiac catheterisation

    Energy Technology Data Exchange (ETDEWEB)

    Reant, Patricia [Department of Cardiology and Echocardiography, Hopital Cardiologique Haut-Leveque, Bordeaux-Pessac (France); University of Victor Segalen, F33076 Bordeaux (France)]. E-mail: patreant@free.fr; Lederlin, Mathieu [Department of Radiology, Hopital Cardiologique Haut-Leveque, Bordeaux-Pessac (France); University of Victor Segalen, F33076 Bordeaux (France); Lafitte, Stephane [Department of Cardiology and Echocardiography, Hopital Cardiologique Haut-Leveque, Bordeaux-Pessac (France); University of Victor Segalen, F33076 Bordeaux (France); Serri, Karim [Department of Cardiology and Echocardiography, Hopital Cardiologique Haut-Leveque, Bordeaux-Pessac (France); University of Victor Segalen, F33076 Bordeaux (France); Montaudon, Michel [Department of Radiology, Hopital Cardiologique Haut-Leveque, Bordeaux-Pessac (France); University of Victor Segalen, F33076 Bordeaux (France); Inserm E356, F33076 Bordeaux (France); Corneloup, Olivier [Department of Radiology, Hopital Cardiologique Haut-Leveque, Bordeaux-Pessac (France); University of Victor Segalen, F33076 Bordeaux (France); Roudaut, Raymond [Department of Cardiology and Echocardiography, Hopital Cardiologique Haut-Leveque, Bordeaux-Pessac (France); University of Victor Segalen, F33076 Bordeaux (France); Laurent, Francois [Department of Radiology, Hopital Cardiologique Haut-Leveque, Bordeaux-Pessac (France); University of Victor Segalen, F33076 Bordeaux (France); Inserm E356, F33076 Bordeaux (France)

    2006-08-15

    Objective: The aims of this study were to investigate absolute assessment of aortic valve area (AVA), before surgery for aortic stenosis, using cardiovascular magnetic resonance (CMR) in comparison with transoesophageal echocardiography (TEE) and with effective AVA indirectly obtained by routine techniques i.e. transthoracic echocardiography (TTE) and cardiac catheterisation. Materials and methods: Absolute AVA planimetry was performed by TEE and CMR steady state free precession sequences obtained through the aortic valvular plane. Effective AVA was calculated by the continuity equation in TTE and by cardiac catheterisation (Gorlin formula). Results: Thirty-nine patients with aortic valve stenosis, mean age 71.7 {+-} 7.6 years, with a mean AVA of 0.93 {+-} 0.31 cm{sup 2} as measured by TEE, were enrolled in the study. Mean differences were: between CMR and TEE planimetry: d = 0.01 {+-} 0.14 cm{sup 2}, between CMR and cardiac catheterisation: d = 0.05 {+-} 0.13 cm{sup 2}, between CMR and TTE: d = 0.10 {+-} 0.17 cm{sup 2}, between TTE and TEE: d = 0.10 {+-} 0.18 cm{sup 2}, between TTE and cardiac catheterisation: d 0.06 {+-} 0.16 cm{sup 2}, and between TEE and cardiac catheterisation: d = 0.07 {+-} 0.13 cm{sup 2}. Mean intraobserver and interobserver differences of CMR planimetry were d = 0.02 {+-} 0.07 cm{sup 2} and d = 0.03 {+-} 0.14 cm{sup 2}, respectively. Conclusion: CMR planimetry of the AVA is a noninvasive and reproducible technique to evaluate stenotic aortic valves and can be used as an alternative to echocardiography or cardiac catheterisation.

  5. Superiorization of incremental optimization algorithms for statistical tomographic image reconstruction

    Science.gov (United States)

    Helou, E. S.; Zibetti, M. V. W.; Miqueles, E. X.

    2017-04-01

    We propose the superiorization of incremental algorithms for tomographic image reconstruction. The resulting methods follow a better path in its way to finding the optimal solution for the maximum likelihood problem in the sense that they are closer to the Pareto optimal curve than the non-superiorized techniques. A new scaled gradient iteration is proposed and three superiorization schemes are evaluated. Theoretical analysis of the methods as well as computational experiments with both synthetic and real data are provided.

  6. Magnetic resonance imaging evaluation of meniscoid superior labrum: normal variant or superior labral tear*

    Science.gov (United States)

    Simão, Marcelo Novelino; Vinson, Emily N.; Spritzer, Charles E.

    2016-01-01

    Objective The objective of this study was to determine the incidence of a "meniscoid" superior labrum. Materials and Methods This was a retrospective analysis of 582 magnetic resonance imaging examinations of shoulders. Of those 582 examinations, 110 were excluded, for a variety of reasons, and the final analysis therefore included 472 cases. Consensus readings were performed by three musculoskeletal radiologists using specific criteria to diagnose meniscoid labra. Results A meniscoid superior labrum was identified in 48 (10.2%) of the 472 cases evaluated. Arthroscopic proof was available in 21 cases (43.8%). In 10 (47.6%) of those 21 cases, the operative report did not include the mention a superior labral tear, thus suggesting the presence of a meniscoid labrum. In only one of those cases were there specific comments about a mobile superior labrum (i.e., meniscoid labrum). In the remaining 11 (52.4%), surgical correlation demonstrated superior labral tears. Conclusion A meniscoid superior labrum is not an infrequent finding. Depending upon assumptions and the requirement of surgical proof, the prevalence of a meniscoid superior labrum in this study was between 2.1% (surgically proven) and 4.8% (projected). However, superior labral tears are just as common and are often confused with meniscoid labra. PMID:27777474

  7. Origins of superior dynamic visual acuity in baseball players: superior eye movements or superior image processing.

    Directory of Open Access Journals (Sweden)

    Yusuke Uchida

    Full Text Available Dynamic visual acuity (DVA is defined as the ability to discriminate the fine parts of a moving object. DVA is generally better in athletes than in non-athletes, and the better DVA of athletes has been attributed to a better ability to track moving objects. In the present study, we hypothesized that the better DVA of athletes is partly derived from better perception of moving images on the retina through some kind of perceptual learning. To test this hypothesis, we quantitatively measured DVA in baseball players and non-athletes using moving Landolt rings in two conditions. In the first experiment, the participants were allowed to move their eyes (free-eye-movement conditions, whereas in the second they were required to fixate on a fixation target (fixation conditions. The athletes displayed significantly better DVA than the non-athletes in the free-eye-movement conditions. However, there was no significant difference between the groups in the fixation conditions. These results suggest that the better DVA of athletes is primarily due to an improved ability to track moving targets with their eyes, rather than to improved perception of moving images on the retina.

  8. EchoComTEE - a simulator for transoesophageal echocardiography.

    Science.gov (United States)

    Weidenbach, M; Drachsler, H; Wild, F; Kreutter, S; Razek, V; Grunst, G; Ender, J; Berlage, T; Janousek, J

    2007-04-01

    Transoesophageal echocardiography (TOE) requires extensive hands-on training, and it is for this purpose we have designed EchoComTEE, a simulator for TOE. It consists of a manikin and dummy probe; according to the position of the dummy probe (tracked by an electromagnetic sensor), two-dimensional (2D) images are calculated from three-dimensional (3D) data sets. Echocardiographic images are presented side-by-side with a virtual scene consisting of a 3D heart, probe tip and image plane. In this way the trainee is provided with visual feed-back of the relationship between echocardiogram and image plane position. We evaluated the simulator using a standardised questionnaire. Twenty-five experts and 31 novice users participated in the study. Most experts graded the simulator as realistic and all recommended its use for training. Most novice users felt the simulator supported spatial orientation during TOE and, as anaesthetists often do not have training in transthoracic echocardiography, in this group the TOE simulator might be particularly useful.

  9. Type F Congenital Quadricuspid Aortic Valve: A Very Rare Case Diagnosed by 3-dimenional Transoesophageal Echocardiography

    Science.gov (United States)

    Garg, Pankaj; Kamaruddin, Hazlyna; Orme, Rachel; Watt, Victoria

    2014-01-01

    Congenital quadricuspid aortic valve (QAV) is a rare cardiac anomaly. Several different anatomical variations of a quadricuspid aortic valve have been described. Aortic regurgitation is the predominant valvular dysfunction associated with QAV and patients tend to present in their 5th or 6th decade of life. This anomaly is rarely picked up by transthoracic echocardiogram (TTE). A comprehensive transoesophageal echocardiography (TOE) study is more likely to diagnose it. We describe a very rare type of QAV – Type F in a 52-year-old lady who presented with symptoms of shortness of breath and pre-syncope. We include TOE images and intra-operative valve images. PMID:24707324

  10. Imaging Evaluation of Superior Labral Anteroposterior (SLAP) Tears.

    Science.gov (United States)

    Grubin, Jeremy; Maderazo, Alex; Fitzpatrick, Darren

    2015-10-01

    Superior labral anteroposterior (SLAP) tears are common injuries that are best evaluated with magnetic resonance arthrography (MRA), as it provides the most detailed evaluation of the bicipital labral complex. Given the variety and complexity of SLAP tears, distention of the joint with intra-articular dilute gadolinium contrast properly separates the intra-articular biceps tendon, superior labrum, glenoid cartilage and glenohumeral ligaments to optimize assessment of these structures. This allows for increased diagnostic confidence of the interpreting radiologist and provides a better road map for the surgeon prior to arthroscopy. Indirect MRA and high-field magnetic resonance imaging are sensitive and specific alternative modalities if MRA cannot be performed.

  11. Accuracy of 3-Dimensional Transoesophageal Echocardiography in Assessment of Prosthetic Mitral Valve Dehiscence with Comparison to Anatomical Specimens

    Science.gov (United States)

    Brown, Martin R.; Javorsky, George; Platts, David G.

    2010-01-01

    The evolution of echocardiography from 2-Dimensional Transthoracic Echo through to real time 3-Dimensional Transoesophageal Echo has enabled more accurate visualisation and quantification of valvular disorders especially prosthetic mitral valve paravalvular regurgitation. However, validation of accuracy is rarely confirmed by surgical or post-mortem specimens. We present a case directly comparing different echocardiographic modality images to post mortem specimens in a patient with prosthetic mitral valve paravalvular regurgitation. PMID:20886015

  12. Category superiority effects and the processing of auditory images.

    Science.gov (United States)

    Sharps, M J; Pollitt, B K

    1998-04-01

    Music and information appear to be processed by means of the phonological loop, as opposed to the visuospatial sketchpad, in working memory. Is this also true of memory for nonverbal, nonmusical auditory images, such as the characteristic sounds made by objects? In the present study, university students were presented with equivalent verbal stimuli, nonsemantic auditory stimuli, or pictorial stimuli, by category or in random order. Significant category superiority effects (CSEs) were obtained for both verbal and auditory stimuli, but not for pictorial stimuli, consistent with the expectation of phonological loop processing. However, absolute levels of recall for auditory stimuli were significantly higher than for verbal stimuli and did not differ from the levels observed for pictures, suggesting a somewhat intermediate character of processing for nonverbal, nonmusical auditory information.

  13. Transoesophageal ultrasound and computer tomographic assessment of the equine cricoarytenoid dorsalis muscle: Relationship between muscle geometry and exercising laryngeal function.

    Science.gov (United States)

    Kenny, M; Cercone, M; Rawlinson, J J; Ducharme, N G; Bookbinder, L; Thompson, M; Cheetham, J

    2017-05-01

    Early detection of recurrent laryngeal neuropathy (RLN) is of considerable interest to the equine industry. To describe two imaging modalities, transoesophageal ultrasound (TEU) and computed tomography (CT) with multiplanar reconstruction to assess laryngeal muscle geometry, and determine the relationship between cricoarytenoid dorsalis (CAD) geometry and function. Two-phase study evaluating CAD geometry in experimental horses and horses with naturally occurring RLN. Equine CAD muscle volume was determined from CT scan sets using volumetric reconstruction with LiveWire. The midbody and caudal dorsal-ventral thickness of the CAD muscle was determined using a TEU in the same horses; and in horses with a range of severity of RLN (n = 112). Transoesophageal ultrasound was able to readily image the CAD muscles and lower left:right CAD thickness ratios were observed with increasing disease severity. Computed tomography based muscle volume correlated very closely with ex vivo muscle volume (R(2) = 0.77). Computed tomography reconstruction can accurately determine intrinsic laryngeal muscle geometry. A relationship between TEU measurements of CAD geometry and laryngeal function was established. These imaging techniques could be used to track the response of the CAD muscle to restorative surgical treatments such as nerve muscle pedicle graft, nerve anastomosis and functional electrical stimulation. © 2016 EVJ Ltd.

  14. Medical image of the week: persistent left superior vena cava

    Directory of Open Access Journals (Sweden)

    Hammode E

    2014-10-01

    Full Text Available No abstract available. Article truncated after 150 words. A 19 year old man with acute lymphocytic leukemia was admitted to the ICU with septic shock. Due to areas of cellulitis on the right side of the chest and neck and femoral venous thrombi, a left subclavian central access was attempted. The chest x-ray obtained after line placement is shown below (Figure 1. Blood gas done from the line was consistent with venous blood and venous tranduction was seen. A CT of the chest (Figure 2 confirmed the diagnosis of persistent left superior vena cava (PLSVC. A persistent left superior vena cava is the most common congenital thoracic venous anomaly, seen in 0.3-0.5% of the population (1. Incidence is increased in patients with congenital heart disease to 5%. In most patients a right sided SVC is also present; hence the term SVC duplication has also been used. Embryologically a PLSVC is formed when the left anterior cardinal vein is ...

  15. Assessment of atrial septal defects in adults comparing cardiovascular magnetic resonance with transoesophageal echocardiography

    Directory of Open Access Journals (Sweden)

    Brown Michael A

    2010-07-01

    Full Text Available Abstract Background Many adult patients with secundum-type atrial septal defects (ASDs are able to have these defects fixed percutaneously. Traditionally, this has involved an assessment of ASD size, geometry and atrial septal margins by transoesophageal echocardiography (TOE prior to percutaneous closure. This is a semi-invasive technique, and all of the information obtained could potentially be obtained by non-invasive cardiovascular magnetic resonance (CMR. We compared the assessment of ASDs in consecutive patients being considered for percutaneous ASD closure using CMR and TOE. Methods Consecutive patients with ASDs diagnosed on transthoracic echocardiography (TTE were invited to undergo both CMR and TOE. Assessment of atrial septal margins, maximal and minimal defect dimensions was performed with both techniques. Analyses between CMR and TOE were made using simple linear regression and Bland Altman Analyses. Results Total CMR scan time was 20 minutes, and comparable to the TOE examination time. A total of 20 patients (M:F = 5:15, mean age 42.8 years ± 15.7 were included in the analyses. There was an excellent agreement between CMR and TOE for estimation of maximum defect size (R = 0.87. The anterior inferior, anterior superior and posterior inferior margins could be assessed in all patients with CMR. The posterior superior margin could not be assessed in only one patient. Furthermore, in 1 patient in whom TOE was unable to be performed, CMR was used to successfully direct percutaneous ASD closure. Conclusions CMR agrees with TOE assessment of ASDs in the work-up for percutaneous closure. Potentially CMR could be used instead of TOE for this purpose.

  16. Validity of acoustic quantification colour kinesis for detection of left ventricular regional wall motion abnormalities: a transoesophageal echocardiographic study.

    Science.gov (United States)

    Hartmann, T; Kolev, N; Blaicher, A; Spiss, C; Zimpfer, M

    1997-10-01

    Transoesophageal echocardiography is a sensitive monitor for intraoperative myocardial ischaemia. Colour kinesis is a new technology for echocardiographic assessment of regional wall motion based on acoustic quantification. We have examined the feasibility and accuracy of quantitative segmental analysis of colour kinesis images to provide objective evaluation of systolic regional wall motion during the perioperative period using transoesophageal echocardiography (TOE). Two-dimensional echocardiograms were obtained in the transgastric short-axis and long-axis views in 60 patients with coronary artery disease undergoing noncardiac surgery. End-systolic colour overlays superimposed on the grey scale images were obtained with colour kinesis to colour encode left ventricular endocardial motion throughout systole. These colour-encoded images were divided into segments and compared with corresponding conventional two-dimensional images. Six hundred of a potential 720 left ventricular wall segments were of sufficient resolution for grading by experts; they diagnosed wall motion abnormalities in 61 of these segments by a conventional method. In comparing the conventional TOE method with colour kinesis, there were 60 true positives, 482 true negatives, 57 false positives and 1 false negative result. This yielded a sensitivity of 98%, specificity of 89%, positive predictive value of 51% and negative predictive value of 100%. Translational and rotational movement of the heart and papillary muscle interference were common problems accounting for false positive diagnoses. We conclude that colour kinesis provides a basis for objective and on-line evaluation of left ventricular regional wall motion which is a sensitive but non-specific method. It may be a useful aid for the less experienced because it can potentially direct the anaesthetist's attention towards specific segments.

  17. Ultrasound cylindrical phased array for transoesophageal thermal therapy: initial studies

    Energy Technology Data Exchange (ETDEWEB)

    Melodelima, David [INSERM, Unite 556, 151 Cours Albert Thomas, 69424 Lyon (France); Lafon, Cyril [INSERM, Unite 556, 151 Cours Albert Thomas, 69424 Lyon (France); Prat, Frederic [Centre Hospitalier Bicetre, 78 Avenue General Leclerc, 94275 Le Kremlin Bicetre (France); Birer, Alain [INSERM, Unite 556, 151 Cours Albert Thomas, 69424 Lyon (France); Cathignol, Dominique [INSERM, Unite 556, 151 Cours Albert Thomas, 69424 Lyon (France)

    2002-12-07

    This work was undertaken to investigate the feasibility of constructing a cylindrical phased array composed of 64 elements spread around the periphery (OD 10.6 mm) for transoesophageal ultrasound thermotherapy. The underlying operating principle of this applicator is to rotate a plane ultrasound beam electronically. For this purpose, eight adjacent transducers were successively excited with appropriate delay times so as to generate a plane wave. The exposure direction was changed by exciting a different set of eight elements. For these feasibility studies, we used a cylindrical prototype (OD 10.6 mm) composed of 16 elementary transducers distributed over a quarter of the cylinder, all operating at 4.55 MHz. The active part was mechanically reinforced by a rigid damper structure behind the transducers. It was shown that an ultrasound field similar to that emitted by a plane transducer could be generated. Ex vivo experiments on pig's liver demonstrated that the ultrasound beam could be accurately rotated to generate sector-based lesions to a suitable depth (up to 19 mm). Throughout these experiments, exposures lasting 20 s were delivered at an acoustic intensity of 17 W cm{sup -2}. By varying the power from exposure to exposure, the depth of the lesion at different angles could be controlled.

  18. Imaging of superior labral anterior to posterior (SLAP) tears of the shoulder.

    Science.gov (United States)

    Simoni, P; Scarciolla, L; Kreutz, J; Meunier, B; Beomonte Zobel, B

    2012-12-01

    Superior labral anterior to posterior (SLAP) tears include a number of abnormal changes of the superior glenoid labrum. SLAP tears have been first reported in elite young atlete and are caused by repetitive overhead motion or by a fall on an outstretched arm. SLAP can lead to chronic pain and instability of shoulder. A diagnosis of SLAP may be difficult on the basis of clinical tests. Hence, modern imaging, including computed tomography arthrography (CTA), magnetic resonance imaging (MRI) and magnetic resonance arthrography (MRA) play a key role in the diagnosis of SLAP. The large number of normal anatomic variants of the superior labrum and the surrounding structures make the interpretation of SLAP challenging on imaging and at arthroscopy. In this article the imaging of SLAP are discussed in detail along with relevant anatomy, anatomic variants and biomechanics.

  19. Mallory-Weiss tear following cardiac surgery : transoesophageal echoprobe or nasogastric tube?

    NARCIS (Netherlands)

    De Vries, AJ; van der Maaten, JMAA; Laurens, RRP

    2000-01-01

    A case of fatal upper gastrointestinal bleeding from a Mallory-Weiss tear after transoesophageal echocardiography during cardiac surgery is reported. After the echocardiographic examination, which is considered a safe procedure, a nasogastric tube was inserted which immediately revealed bright red b

  20. The influence of transoesophageal echocardiography on intra-operative decision making - A European multicentre study

    NARCIS (Netherlands)

    Kolev, N; Brase, R; Swanevelder, J; Oppizzi, M; Riesgo, MJ; van der Maaten, JMAA; Abiad, MG; Guarracino, F; Zimpfer, M

    1998-01-01

    The role of transoesophageal echocardiography (TOE) in anaesthesia remains controversial because it is a rapidly evolving technique with few proven benefits and considerable cost. Recently, the Society of Cardiovascular Anaesthesiologists has published practice guidelines for the use of peri-operati

  1. Mallory-Weiss tear following cardiac surgery : transoesophageal echoprobe or nasogastric tube?

    NARCIS (Netherlands)

    De Vries, AJ; van der Maaten, JMAA; Laurens, RRP

    A case of fatal upper gastrointestinal bleeding from a Mallory-Weiss tear after transoesophageal echocardiography during cardiac surgery is reported. After the echocardiographic examination, which is considered a safe procedure, a nasogastric tube was inserted which immediately revealed bright red

  2. The influence of transoesophageal echocardiography on intra-operative decision making - A European multicentre study

    NARCIS (Netherlands)

    Kolev, N; Brase, R; Swanevelder, J; Oppizzi, M; Riesgo, MJ; van der Maaten, JMAA; Abiad, MG; Guarracino, F; Zimpfer, M

    1998-01-01

    The role of transoesophageal echocardiography (TOE) in anaesthesia remains controversial because it is a rapidly evolving technique with few proven benefits and considerable cost. Recently, the Society of Cardiovascular Anaesthesiologists has published practice guidelines for the use of peri-operati

  3. Superiority of zoom lens coupling in designing a novel X-ray image detector

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    We design a novel X-ray image detector by lens coupling a Gd2O2S:Tb intensifying screen with a high performance low-light-level (L3,which often means luminescence less than 10-3 Lux) image intensifier.Different coupling effects on imaging performance between zoom lens and fix-focus lens are analyzed theoretically.In experiment,for designing a detector of 15-inch visual field,the system coupled by zoom lens is of 12.25-1p/cm resolution,while the one with fix-focus lens is 10 lp/cm.The superiority of zoom lens is validated.It is concluded that zoom lens preserves the image information better than fix-focus lens and improves the imaging system's performance in this design,which is referential to the design of other optical imaging systems.

  4. Breast varices: imaging findings of an unusual presentation of collateral pathways in superior vena caval syndrome

    Energy Technology Data Exchange (ETDEWEB)

    Oezdemir, Ayseguel E-mail: aozdemir@tip.gazi.edu.tr; Ilgit, Erhan T.; Konus, Oeznur L.; Cetin, Meltem; Oezsunar, Yelda

    2000-11-01

    Imaging findings are presented of an unusual pathway of collateral circulation consisting of bilateral and diffuse dilated breast veins from a patient with long standing superior vena caval syndrome. The main importance of this case is the extent of the collateral development through the breast veins, serving as the major pathway of collateral circulation. Identification of this unusual collateral development, which resembles breast varices, was performed with contrast-enhanced chest CT scans, digital subtraction venography, color Doppler ultrasonography, and mammographic studies. Collateral development was secondary to a long segment idiopathic venous occlusion involving bilateral subclavian and brachiocephalic veins as well as vena cava superior. We conclude that dilated breast veins when detected on any imaging modality should raise the suspicion of central venous obstruction.

  5. Cardiac magnetic resonance, transthoracic and transoesophageal echocardiography: a comparison of in vivo assessment of ventricular function in rats.

    Science.gov (United States)

    Richardson, J D; Bertaso, A G; Frost, L; Psaltis, P J; Carbone, A; Koschade, B; Wong, D T; Nelson, A J; Paton, S; Williams, K; Azarisman, S; Worthley, M I; Teo, K S; Gronthos, S; Zannettino, A C W; Worthley, S G

    2013-10-01

    In vivo assessment of ventricular function in rodents has largely been restricted to transthoracic echocardiography (TTE). However 1.5 T cardiac magnetic resonance (CMR) and transoesophageal echocardiography (TOE) have emerged as possible alternatives. Yet, to date, no study has systematically assessed these three imaging modalities in determining ejection fraction (EF) in rats. Twenty rats underwent imaging four weeks after surgically-induced myocardial infarction. CMR was performed on a 1.5 T scanner, TTE was conducted using a 9.2 MHz transducer and TOE was performed with a 10 MHz intracardiac echo catheter. Correlation between the three techniques for EF determination and analysis reproducibility was assessed. Moderate-strong correlation was observed between the three modalities; the greatest between CMR and TOE (intraclass correlation coefficient (ICC) = 0.89), followed by TOE and TTE (ICC = 0.70) and CMR and TTE (ICC = 0.63). Intra- and inter-observer variations were excellent with CMR (ICC = 0.99 and 0.98 respectively), very good with TTE (0.90 and 0.89) and TOE (0.87 and 0.84). Each modality is a viable option for evaluating ventricular function in rats, however the high image quality and excellent reproducibility of CMR offers distinct advantages even at 1.5 T with conventional coils and software.

  6. Benzocaine-induced methaemoglobinaemia: a life-threatening complication after a transoesophageal echocardiogram (TEE).

    Science.gov (United States)

    Aryal, Madan Raj; Gupta, Shobhit; Giri, Smith; Fraga, Julian Diaz

    2013-09-16

    Acquired methaemoglobinaemia is a potentially fatal impairment in oxygen delivery if not recognised early and treated appropriately. Benzocaine used as an anaesthetic for endoscopic procedures is an uncommon but clinically important precipitant of acquired methaemoglobinaemia. We present a case of an elderly woman who developed perioral cyanosis and desaturation 20 min after a transoesophageal echocardiogram. Further evaluation led to the diagnosis of benzocaine-induced methaemoglobinaemia and timely treatment with intravenous methylene blue was initiated.

  7. Computerized Assessment of Superior Semicircular Canal Dehiscence Size using Advanced Morphological Imaging Operators.

    Science.gov (United States)

    Beckett, Joel S; Lagman, Carlito; Chung, Lawrance K; Bui, Timothy T; Lee, Seung J; Voth, Brittany L; Gaonkar, Bilwaj; Gopen, Quinton; Yang, Isaac

    2017-04-01

    Superior semicircular canal dehiscence (SSCD) describes a pathological aperture at the level of the arcuate eminence. Techniques for quantifying defect size are described with most studies using two-dimensional lengths that underestimate the pathology. The objective of this study is to describe a novel method of measurement that combines manual segmentation of high-resolution computed tomography (HRCT) images of the temporal bone and a morphological skeletonization transform to calculate dehiscence volume. Images were imported into a freely available image segmentation tool: ITK-SNAP (version 3.4.0; available at: http://www.itksnap.org/) software. Coronal and sagittal planes were used to outline the dehiscence in all slices demonstrating the defect using the paintbrush tool. A morphological skeletonization transform derived a single-pixel thick representation of the original delineation. This "sheet" of voxels overlaid the dehiscence. Volume was calculated by counting the number of nonzero image voxels within this "sheet" and multiplying this number by the volume (mm(3)) of each voxel. A total of 70 cases of SSCD were identified. Overall, mean volume was 0.88 mm(3) (standard deviation: 0.57, range: 0.11-2.27). We present a novel technique for measuring SSCD, which we believe provides a more accurate representation of the pathology, and has the potential to standardize measurement of SSCD.

  8. Veia cava superior esquerda anômala com ausência de veia cava superior direita: achados de imagem Persistent left superior vena cava with absent right superior vena cava: image findings

    Directory of Open Access Journals (Sweden)

    Cyrillo Rodrigues de Araújo Júnior

    2003-10-01

    Full Text Available A persistência da veia cava superior esquerda com ausência da veia cava superior direita é uma anomalia rara, com menos de 150 casos descritos na literatura. A não-obliteração e regressão da veia cardinal anterior esquerda durante o desenvolvimento embriológico promove uma variação sistêmica de retorno venoso ao coração, com persistência da veia cava superior esquerda. Sua incidência varia de 0,3% em pacientes sem alterações cardíacas congênitas concomitantes a 4,3% naqueles com cardiopatias. Na maioria das vezes coexiste a veia cava superior direita, porém se houver regressão e degeneração da veia cardinal anterior direita, implicará a sua ausência e a drenagem venosa para o coração será feita pela veia cava superior esquerda ao átrio direito, através do seio coronariano. Mostramos um caso de um paciente submetido a radiografia de tórax e tomografia computadorizada para avaliação de doença pulmonar obstrutiva crônica, tendo como achado a persistência da veia cava superior esquerda com ausência da direita, sem qualquer cardiopatia associada e com a drenagem cardíaca sendo feita, através do seio coronariano, para o átrio direito.Persistent left superior vena cava with absent right superior vena cava is a rare anomaly, with less than 150 cases reported in the literature. Congenitally persistent left superior vena cava is the most common variant of systemic venous return to the heart, resulting embryologically from failure of the left anterior cardinal vein to become obliterated. Its incidence varies from 0.3% in patients with otherwise normal heart to 4.3% in patients with congenital heart disease. In the majority of the patients, a right superior vena cava is present as well, but rarely the right anterior cardinal vein degenerates resulting in the absence of the normal right superior vena cava. The blood from the right side is carried by the persistent left superior vena cava to the right atrium through the

  9. Semiautomated volumetric response evaluation as an imaging biomarker in superior sulcus tumors

    Energy Technology Data Exchange (ETDEWEB)

    Vos, C.G.; Paul, M.A. [VU University Medical Center, Departments of Surgery, Amsterdam (Netherlands); Dahele, M.; Soernsen de Koste, J.R. van; Senan, S. [VU University Medical Center, Departments of Radiation Oncology, Amsterdam (Netherlands); Bahce, I.; Smit, E.F. [VU University Medical Center, Departments of Pulmonary Diseases, Amsterdam (Netherlands); Thunnissen, E. [VU University Medical Center, Departments of Pathology, Amsterdam (Netherlands); Hartemink, K.J. [VU University Medical Center, Departments of Surgery, Amsterdam (Netherlands); Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital (NKI-AVL), Department of Surgery, Amsterdam (Netherlands)

    2014-02-15

    Volumetric response to therapy has been suggested as a biomarker for patient-centered outcomes. The primary aim of this pilot study was to investigate whether the volumetric response to induction chemoradiotherapy was associated with pathological complete response (pCR) or survival in patients with superior sulcus tumors managed with trimodality therapy. The secondary aim was to evaluate a semiautomated method for serial volume assessment. In this retrospective study, treatment outcomes were obtained from a departmental database. The tumor was delineated on the computed tomography (CT) scan used for radiotherapy planning, which was typically performed during the first cycle of chemotherapy. These contours were transferred to the post-chemoradiotherapy diagnostic CT scan using deformable image registration (DIR) with/without manual editing. CT scans from 30 eligible patients were analyzed. Median follow-up was 51 months. Neither absolute nor relative reduction in tumor volume following chemoradiotherapy correlated with pCR or 2-year survival. The tumor volumes determined by DIR alone and DIR + manual editing correlated to a high degree (R{sup 2} = 0.99, P < 0.01). Volumetric response to induction chemoradiotherapy was not correlated with pCR or survival in patients with superior sulcus tumors managed with trimodality therapy. DIR-based contour propagation merits further evaluation as a tool for serial volumetric assessment. (orig.)

  10. A self-recovery fragile watermarking scheme for image authentication with superior localization

    Institute of Scientific and Technical Information of China (English)

    HE HongJie; ZHANG JiaShu; CHEN Fan

    2008-01-01

    To address the problems of the inferior localization and high probability of false rejection in existing self-recovery fragile watermarking algorithms,this paper proposes a new self-recovery fragile watermarking scheme with superior localization,and further discusses the probability of false rejection (PFR) and the probability of false acceptance (PFA) of the proposed scheme.Moreover,four measurements are defined to evaluate the quality of a recovered image.In the proposed algorithm,the original image is divided into 2×2 blocks to improve localization precision and decrease PFR under occurrence of random tampering.The PFR under occurrence of region tampering can be effectively decreased by randomly embedding the watermark of each block in conjunction with a novel method of tamper detection.Compared with the current self-recovery fragile watermarking algorithms,the proposed scheme not only resolves the tamper detection problem of self-embedding water marking,but also improves the robustness against the random tampering of self-embedding watermarking.In addition,the subjective measurements are provided to evaluate the performance of the self-recovery watermarking schemes for image authentication.

  11. Superior Cervical Sympathetic Ganglion: Normal Imaging Appearance on 3T-MRI

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Joo Yeon; Lee, Jeong Hyun [Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505 (Korea, Republic of); Song, Joon Seon; Song, Min Jeong [Department of Pathology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505 (Korea, Republic of); Hwang, Seung-Jun [Department of Anatomy and Cell Biology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505 (Korea, Republic of); Yoon, Ra Gyoung [Department of Radiology, Catholic Kwandong University International St. Mary' s Hospital, Catholic Kwandong University College of Medicine, Incheon 22711 (Korea, Republic of); Jang, Seung Won; Park, Ji Eun [Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505 (Korea, Republic of); Heo, Young Jin [Department of Radiology, Busan Paik Hospital, Inje University College of Medicine, Busan 47392 (Korea, Republic of); Choi, Young Jun; Baek, Jung Hwan [Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505 (Korea, Republic of)

    2016-11-01

    To identify superior cervical sympathetic ganglion (SCSG) and describe their characteristic MR appearance using 3T-MRI. In this prospective study, we recruited 53 consecutive patients without history of head and neck irradiation. Using anatomic location based on literature review, both sides of the neck were evaluated to identify SCSGs in consensus. SCSGs were divided into definite (medial to internal carotid artery [ICA] and lateral to longus capitis muscle [LCM]) and probable SCSGs based on relative location to ICA and LCM. Two readers evaluated signal characteristics including intraganglionic hypointensity of all SCSGs and relative location of probable SCSGs. Interrater and intrarater agreements were quantified using unweighted kappa. Ninety-one neck sites in 53 patients were evaluated after exclusion of 15 neck sites with pathology. Definite SCSGs were identified at 66 (73%) sites, and probable SCSGs were found in 25 (27%). Probable SCSGs were located anterior to LCM in 16 (18%), lateral to ICA in 6 (7%), and posterior to ICA in 3 (3%). Intraganglionic hypointensity was identified in 82 (90%) on contrast-enhanced fat-suppressed T1-weighted images. There was no statistical difference in the relative location between definite and probable SCSGs of the right and left sides with intragnalionic hypointensity on difference pulse sequences. Interrater and intrarater agreements on the location and intraganglionic hypointensity were excellent (κ-value, 0.749–1.000). 3T-MRI identified definite SCSGs at 73% of neck sites and varied location of the remaining SCSGs. Intraganglionic hypointensity was a characteristic feature of SCSGs.

  12. Superior cervical sympathetic ganglion: Normal imaging appearance on 3T-MRI

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Joo Yeon; Lee, Jeong Hyun; Song, Joon Seon [Dept. of Radiology, and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul (Korea, Republic of); and others

    2016-09-15

    To identify superior cervical sympathetic ganglion (SCSG) and describe their characteristic MR appearance using 3T-MRI. In this prospective study, we recruited 53 consecutive patients without history of head and neck irradiation. Using anatomic location based on literature review, both sides of the neck were evaluated to identify SCSGs in consensus. SCSGs were divided into definite (medial to internal carotid artery [ICA] and lateral to longus capitis muscle [LCM]) and probable SCSGs based on relative location to ICA and LCM. Two readers evaluated signal characteristics including intraganglionic hypointensity of all SCSGs and relative location of probable SCSGs. Interrater and intrarater agreements were quantified using unweighted kappa. Ninety-one neck sites in 53 patients were evaluated after exclusion of 15 neck sites with pathology. Definite SCSGs were identified at 66 (73%) sites, and probable SCSGs were found in 25 (27%). Probable SCSGs were located anterior to LCM in 16 (18%), lateral to ICA in 6 (7%), and posterior to ICA in 3 (3%). Intraganglionic hypointensity was identified in 82 (90%) on contrast-enhanced fat-suppressed T1-weighted images. There was no statistical difference in the relative location between definite and probable SCSGs of the right and left sides with intragnalionic hypointensity on difference pulse sequences. Interrater and intrarater agreements on the location and intraganglionic hypointensity were excellent (κ-value, 0.749–1.000). 3T-MRI identified definite SCSGs at 73% of neck sites and varied location of the remaining SCSGs. Intraganglionic hypointensity was a characteristic feature of SCSGs.

  13. Transoesophageal detection of heart graft rejection by electrical impedance: Using finite element method simulations

    Science.gov (United States)

    Giovinazzo, G.; Ribas, N.; Cinca, J.; Rosell-Ferrer, J.

    2010-04-01

    Previous studies have shown that it is possible to evaluate heart graft rejection level using a bioimpedance technique by means of an intracavitary catheter. However, this technique does not present relevant advantages compared to the gold standard for the detection of a heart rejection, which is the biopsy of the endomyocardial tissue. We propose to use a less invasive technique that consists in the use of a transoesophageal catheter and two standard ECG electrodes on the thorax. The aim of this work is to evaluate different parameters affecting the impedance measurement, including: sensitivity to electrical conductivity and permittivity of different organs in the thorax, lung edema and pleural water. From these results, we deduce the best estimator for cardiac rejection detection, and we obtain the tools to identify possible cases of false positive of heart rejection due to other factors. To achieve these objectives we have created a thoracic model and we have simulated, with a FEM program, different situations at the frequencies of 13, 30, 100, 300 and 1000 kHz. Our simulation demonstrates that the phase, at 100 and 300 kHz, has the higher sensitivity to changes in the electrical parameters of the heart muscle.

  14. The impact of a perceptual and adaptive learning module on transoesophageal echocardiography interpretation by anaesthesiology residents.

    Science.gov (United States)

    Romito, B T; Krasne, S; Kellman, P J; Dhillon, A

    2016-10-01

    The role of transoesophageal echocardiography (TOE) in anaesthetic practice is expanding. We evaluated the effect of a TOE perceptual and adaptive learning module (PALM) on first-yr anaesthesiology residents' performance, in diagnosing cardiac pathology by TOE. First-yr residents were assigned to a group (n = 12) that used a TOE PALM or a control group that did not (n = 12). Both groups received a TOE pretest that measured their accuracy and response times. The PALM group completed the PALM and a posttest within 30 min and a delayed test six months later. The control group received a delayed test six months after their pretest. Accuracy and fluency (accurate responses within 10 s) were measured. The PALM group had statistically significant improvements for both accuracy and fluency (P accuracy (P = 0.0002, d = 2.7) and fluency (P accuracy and fluency in diagnosing TOE cardiac pathology, in a group of first-year anaesthesiology residents. PALMs can significantly improve learning and pattern recognition in medical education. © The Author 2016. Published by Oxford University Press on behalf of the British Journal of Anaesthesia. All rights reserved. For Permissions, please email: journals.permissions@oup.com.

  15. Neural evidence for the use of digit-image mnemonic in a superior memorist: An fMRI study

    Directory of Open Access Journals (Sweden)

    Li-Jun eYin

    2015-03-01

    Full Text Available Some superior memorists demonstrated exceptional memory for reciting a large body of information. The underlying neural correlates, however, are seldom addressed. C.L., the current holder of Guinness World Record for reciting 67,890 digits in π, participated in this functional magnetic resonance imaging (fMRI study. Thirteen participants without any mnemonics training were included as controls. Our previous studies suggested that C.L. used a digit-image mnemonic in studying and recalling lists of digits, namely associating 2-digit groups of ‘00’ to ‘99’ with images and generating vivid stories out of them (Hu, Ericsson, Yang & Lu, 2009. Thus, 2-digit condition was included, with 1-digit numbers and letters as control conditions. We hypothesized that 2-digit condition in C.L. should elicit the strongest activity in the brain regions which are associated with his mnemonic. Functional MRI results revealed that bilateral frontal poles (FPs, BA10, left superior parietal lobule (SPL, left premotor cortex (PMC, and left dorsolateral prefrontal cortex (DLPFC, were more engaged in both the study and recall phase of 2-digit condition for C.L. relative to controls. Moreover, the left middle/inferior frontal gyri (M/IFG and intraparietal sulci (IPS were less engaged in the study phase of 2-digit condition for C.L. (vs. controls. These results suggested that C.L. relied more on brain regions that are associated with episodic memory other than verbal rehearsal while he used his mnemonic strategies. This study supported theoretical accounts of restructured cognitive mechanisms for the acquisition of superior memory performance.

  16. Detection of left atrial thrombus in patients with mitral stenosis and atrial fibrillation: retrospective comparison of two-phase computed tomography, transoesophageal echocardiography and surgical findings

    Energy Technology Data Exchange (ETDEWEB)

    Choi, Bo Hwa; Ko, Sung Min [Konkuk University Medical Center, Konkuk University School of Medicine, Department of Radiology, Research Institute of Medical Science, Seoul (Korea, Republic of); Hwang, Hweung Kon [Konkuk University Medical Center, Konkuk University School of Medicine, Department of Cardiology, Seoul (Korea, Republic of); Song, Meong Gun; Shin, Je Kyoun [Konkuk University Medical Center, Konkuk University School of Medicine, Department of Thoracic surgery, Seoul (Korea, Republic of); Kang, Woon Seok; Kim, Tae-Yop [Konkuk University Medical Center, Konkuk University School of Medicine, Department of Anesthesiology, Seoul (Korea, Republic of)

    2013-11-15

    This retrospective study aims to assess the accuracy of two-phase computed tomography (CT) and transoesophageal echocardiography (TEE) for the detection of left atrial (LA) thrombus in patients with mitral stenosis (MS) and atrial fibrillation (AF), by using intraoperative findings as the reference standard. Preoperative two-phase CT and intraoperative TEE were performed in 106 patients with MS and AF. The ratio (LAA/AA{sub L}) of Hounsfield units (HU) in the LA appendage (LAA) to the ascending aorta (AA) was calculated on the late-phase CT image. LA echodense masses on TEE and LA filling defects on two-phase CT were observed in 29 and 39 patients, respectively. Thirty-five LA thrombi were identified at surgery in 27 patients. Compared with the intraoperative findings, per-patient sensitivity, specificity, positive and negative predictive values of two-phase CT were 100 %, 85 %, 69 % and 100 %, and those by using TEE were 93 %, 95 %, 86 % and 97 % in detecting LAA thrombus. After adopting the cut-off value of 0.5 for the LAA/AA{sub L} HU ratio, the specificity and positive predictive value of two-phase CT were increased to 96 % and 90 %, respectively. Two-phase CT with a cut-off value of LAA/AA{sub L} HU ratio of 0.5 provides high performance for the detection of LAA thrombus. (orig.)

  17. Multi-detector computed tomography is equivalent to trans-oesophageal echocardiography for the assessment of the aortic annulus before transcatheter aortic valve implantation

    Energy Technology Data Exchange (ETDEWEB)

    Rixe, Johannes; Schmitt, Joern; Neumann, Thomas; Hamm, Christian W.; Rolf, Andreas [Kerckhoff Heart and Thorax Center, Department of Cardiology, Bad Nauheim (Germany); University Hospital of Giessen and Marburg, Site Giessen, Department of Internal Medicine I (Cardiology, Angiology), Giessen (Germany); Schuhbaeck, Annika; Nef, Holger M.; Achenbach, Stephan [University Hospital of Giessen and Marburg, Site Giessen, Department of Internal Medicine I (Cardiology, Angiology), Giessen (Germany); Liebetrau, Christoph; Moellmann, Helge; Szardien, Sebastian; Brandt, Roland [Kerckhoff Heart and Thorax Center, Department of Cardiology, Bad Nauheim (Germany); Schneider, Christian; Krombach, Gabriele [University Hospital of Giessen and Marburg, Department of Radiology, Giessen (Germany)

    2012-12-15

    In transcatheter aortic valve implantation (TAVI), assessment of the aortic annulus is mandatory. We sought to investigate the correlation between trans-oesophageal echocardiography (TEE) and multi-detector computed tomography (MDCT) for annulus diameter assessment before TAVI. A total of 122 patients (67 male, mean age 84 {+-} 6 years) underwent MDCT and TEE for TAVI planning. In TEE annulus diameters were obtained in a long-axis view at diastole. MDCT data were evaluated using MPR images, and corresponding projections were adjusted for MDCT and TEE. Patients were classified by the predominant localisation of aortic valve calcifications, and annulus diameters between TEE and MDCT were correlated. Additionally, the eccentricity of the aortic annulus was calculated. Mean eccentricity of the aortic annulus determined by MDCT was 0.34 {+-} 0.17, with no difference according to valve calcification. Regarding the aortic annulus diameter, the mean values measured were 24.3 {+-} 2.1 mm in MDCT and 24.0 {+-} 2.5 mm in TEE (P < 0.0001 for agreement). Independent of the pattern of aortic valve calcification, close correlation is found between CT and TEE measurements of the aortic annulus diameter. In addition, CT demonstrates the non-circular shape of the aortic annulus. (orig.)

  18. Is tissue harmonic ultrasound imaging (THI) of the prostatic urethra and rectum superior to brightness (B) mode imaging? An observer study.

    Science.gov (United States)

    Sandhu, Gurpreet K; Angyalfi, Steve; Dunscombe, Peter B; Khan, Rao F

    2014-09-01

    Quality ultrasound images are an essential part of prostate brachytherapy procedure. The authors have previously reported that tissue harmonic ultrasound images (THI) are superior to brightness (B) mode for the prostate. The objective of the current study was to compare both imaging modes for visualization of the prostatic urethra and rectum. B and THI mode transrectal ultrasound images were acquired for ten patients. The prostatic urethra and rectal wall were contoured by a radiation oncologist (RO) and five observers on randomly presented images. The contours on one patient were repeated four additional times by four observers. All the images were qualitatively scored using a five-level Likert scale. The values of the Pearson product-moment correlation coefficients showed that the observers were in close agreement with the RO. Two sample paired student t-test showed that the rectum volumes with THI were significantly smaller than B-mode, but no significant difference for urethra. Two-factor analysis of variances showed significant observer variability in defining the rectum and urethra in both imaging modes. Observer consistency of the rectum volumes, estimated by standard deviations as percentages of means was significantly improved for THI. The Likert scale based qualitative assessment supported quantitative observations. The significant improvement in image quality of the prostate (reported previously) and rectum with THI may offer better-quality treatment plans for prostate brachytherapy and potential improvement in local control. Copyright © 2014 Associazione Italiana di Fisica Medica. Published by Elsevier Ltd. All rights reserved.

  19. Medical image of the week: superior sulcus tumor with neural invasion

    Directory of Open Access Journals (Sweden)

    Cassidy S

    2017-06-01

    Full Text Available No abstract available. Article truncated after 150 words. A 78-year-old woman with left upper lobe squamous cell carcinoma presented with severe left arm and upper posterior chest pain. The pain was described as a severe burning sensation with “pins and needles”, and there was loss of motor function in the arm. This neuropathic pain was refractory to escalating doses of opioids and gabapentin. She was receiving chemotherapy with paclitaxel and carboplatin and completed five radiation treatments. On physical examination, there was atrophy of the left forearm and hand muscles. No evidence of Horner’s syndrome was noted. A CT of the chest with contrast (Figure 1 showed a 5.8 cm apical segment left upper lobe cavitary mass consistent with a superior sulcus tumor and concomitant pulmonary embolism. An MRI of the cervical and thoracic spine (Figure 2 showed a large apical necrotic tumor abutting the upper thoracic spine with invasion of the neural foramina at C7-T1, T1-T2, and T2-T3 …

  20. Magnetic resonance imaging of intact globe superior subluxation into the intracranium

    Directory of Open Access Journals (Sweden)

    Nariman Nezami

    2012-01-01

    Full Text Available A 67-year-old man with right-sided blunt ocular trauma is reported here. Despite having received primary medical care, the patient complained of severe headache for 14 days. Initial computed tomography (CT indicated hematoma in the right frontal lobe. However, magnetic resonance imaging (MRI indicated that the right globe along with its optic nerve had been intactly dislocated into the intracranium and differentiated from hematoma. In this case, the significance of MRI, in blunt ocular trauma work-up, and also regaining successful ocular function are highlighted.

  1. Superiority of autostereoscopic visualization for image-guided navigation in liver surgery

    Science.gov (United States)

    Vetter, Marcus; Hassenpflug, Peter; Thorn, Matthias; Cardenas, Carlos; Grenacher, Lars; Richter, Goetz M.; Lamade, Wolfram; Herfarth, Christian; Meinzer, Hans-Peter

    2002-05-01

    A substantial component of an image-guided surgery system (IGSS) is the kind of three-dimensional (3D) presentation to the surgeon because the visual depth perception of the complex anatomy is of significant relevance for orientation. Therefore, we examined for this contribution four different visualization techniques, which were evaluated by eight surgeons. The IGSS developed by our group supports the intraoperative orientation of the surgeon by presenting a visualization of the spatially tracked surgical instruments with respect to vitally important intrahepatic vessels, the tumor, and preoperatively calculated resection planes. In the preliminary trial presented here, we examined the human ability to perceive an intraoperative virtual scene and to solve given navigation tasks. The focus of the experiments was to measure the ability of eight surgeons to orientate themselves intrahepatically and to transfer the perceived virtual spatial relations to movements in real space. With auto-stereoscopic visualization making use of a prism-based display the navigation can be performed faster and more accurate than with the other visualization techniques.

  2. Indocyanine green (ICG lymphography is superior to lymphoscintigraphy for diagnostic imaging of early lymphedema of the upper limbs.

    Directory of Open Access Journals (Sweden)

    Makoto Mihara

    Full Text Available BACKGROUND: Secondary lymphedema causes swelling in limbs due to lymph retention following lymph node dissection in cancer therapy. Initiation of treatment soon after appearance of edema is very important, but there is no method for early diagnosis of lymphedema. In this study, we compared the utility of four diagnostic imaging methods: magnetic resonance imaging (MRI, computed tomography (CT, lymphoscintigraphy, and Indocyanine Green (ICG lymphography. PATIENTS AND METHODS: Between April 2010 and November 2011, we examined 21 female patients (42 arms with unilateral mild upper limb lymphedema using the four methods. The mean age of the patients was 60.4 years old (35-81 years old. Biopsies of skin and collecting lymphatic vessels were performed in 7 patients who underwent lymphaticovenous anastomosis. RESULTS: The specificity was 1 for all four methods. The sensitivity was 1 in ICG lymphography and MRI, 0.62 in lymphoscintigraphy, and 0.33 in CT. These results show that MRI and ICG lymphography are superior to lymphoscintigraphy or CT for diagnosis of lymphedema. In some cases, biopsy findings suggested abnormalities in skin and lymphatic vessels for which lymphoscintigraphy showed no abnormal findings. ICG lymphography showed a dermal backflow pattern in these cases. CONCLUSIONS: Our findings suggest the importance of dual diagnosis by examination of the lymphatic system using ICG lymphography and evaluation of edema in subcutaneous fat tissue using MRI.

  3. Vena contracta area for severity grading in functional and degenerative mitral regurgitation: a transoesophageal 3D colour Doppler analysis in 500 patients.

    Science.gov (United States)

    Goebel, Björn; Heck, Roland; Hamadanchi, Ali; Otto, Sylvia; Doenst, Torsten; Jung, Christian; Lauten, Alexander; Figulla, Hans R; Schulze, P Christian; Poerner, Tudor C

    2017-04-21

    Vena contracta area (VCA3D), derived by 3D colour Doppler echocardiography, has already been validated against cardiac magnetic resonance imaging, but the number of clinical studies to define cut-off values for grading of mitral regurgitation (MR) is limited. Aim of the study was to assess VCA3D in a large population of patients with functional (FMR) and degenerative MR (DMR). Transoesophageal echocardiography was performed in 500 patients with MR. The following 2D parameters were assessed for grading of MR: vena contracta width, effective regurgitant orifice area (EROAPISA), and regurgitation volume (RVPISA). VCA3D and the corresponding regurgitation volume (RVVCA) were quantified using 3D colour Doppler loop and CW Doppler tracing of the regurgitant jet. In 104 patients a 3D dataset of the left ventricle (LV) and the left ventricular outflow tract (LVOT) was acquired. As a reference method, regurgitation volume (RV3D) was calculated as difference between LV overall and LVOT stroke volumes. For prediction of severe MR, VCA3D yielded higher values of area under the ROC curve compared to EROAPISA (overall patient group 0.98 for VCA3D vs. 0.90 for EROAPISA, P FMR group 0.97 for VCA3D vs. 0.92 for EROAPISA, P = 0.002). RVVCA correlated closer with RV3D compared to RVPISA (r = 0.96 for RVPISA, r = 0.79 for RVPISA). This study delivers cut-off values for VCA3D in patients with different types of MR. VCA3D is a robust parameter for quantification of MR, showing a good correlation with the reference method using 3D datasets of LV.

  4. Sleep paralysis and "the bedroom intruder": the role of the right superior parietal, phantom pain and body image projection.

    Science.gov (United States)

    Jalal, Baland; Ramachandran, Vilayanur S

    2014-12-01

    Sleep paralysis (SP) is a common condition occurring either at sleep onset or sleep offset. During SP the sleeper experiences gross motor paralysis while the sensory system is clear. Hypnogogic and hypnopompic hallucinations are common during SP and may involve seeing, hearing, and sensing the presence of menacing intruders in one's bedroom. This "intruder" is often perceived as a shadowy humanoid figure. Supernatural accounts of this hallucinated intruder are common across cultures. In this paper, we postulate that a functional disturbance of the right parietal cortex explains the shadowy nocturnal bedroom intruder hallucination during SP. This hallucination may arise due to a disturbance in the multisensory processing of body and self at the temporoparietal junction. We specifically propose that this perceived intruder is the result of a hallucinated projection of the genetically "hard-wired" body image (homunculus), in the right parietal region; namely, the same circuits that dictate aesthetic and sexual preference of body morphology. One way to test this hypothesis would be to study clinical populations who may have genetically acquired "irregularities" in their internal hard-wired body image in the right superior parietal lobule (SPL); for example, individuals with apotemnophilia or anorexia nervosa. If such individuals experience SP (e.g., induced in a sleep lab), and they hallucinate this shadowy figure, one would predict that they would see humanoid shadows and shapes with body irregularities, mirroring their own internal body image morphology. If correct, our hypothesis will offer a neurological explanation for this nocturnal bedroom intruder that has been a source of controversy, and striking and implausible cultural interpretations throughout history. Indeed, if our proposed hypothesis is tested and corroborated, dissemination of such findings would provide great relief to SP experiencers worldwide and could potentially be used in a therapeutic context.

  5. Three-dimensional reconstructed magnetic resonance imaging for diagnosing persistent left superior vena cava. Comparison with magnetic resonance angiography and plain chest radiography

    Energy Technology Data Exchange (ETDEWEB)

    Koito, Hitoshi; Suzuki, Junichi; Ohkubo, Naohiko; Ishiguro, Yuka; Iwasaka, Toshiji; Inada, Mitsuo; Nakano, Yoshihisa [Kansai Medical Univ., Moriguchi, Osaka (Japan)

    1996-09-01

    The usefulness of low-cost, three-dimensional (3D) images reconstructed from magnetic resonance (MR) imaging for investigating persistent left superior vena cava was assessed and compared to the diagnostic accuracy of chest radiography. MR imaging by the spin-echo technique and MR angiography were performed in 10 patients with this anomaly diagnosed previously by contrast echocardiography and radionuclide angiocardiography. Four patients had complicating cardiac anomalies, one with postoperative atrial septal defect, one with postoperative ventricular septal defect, one with atrial septal defect and partial anomalous pulmonary venous return, and one with aortic coarctation and patent ductus arteriosus. Multisectional and multiphasic MR images were used for the 3D-reconstruction of the cardiovascular and mediastinal structures with a NeXT workstation and a 3D-kit. The 3D-reconstructed MR imaging clearly showed the persistent left superior vena cava and the anatomical relationship with the other cardiovascular and mediastinal structures in all 10 patients. Vascular shadows were observed outside the upper left border of the aortic arch on the chest radiographs in seven patients, and the 3D-reconstructed MR images revealed these shadows to be compatible with superior caval vein. The ratios of the diameter between the left and right superior venae cavae with and without the left innominate vein were 0.63{+-}0.14 (mean{+-}SD) and 0.94{+-}0.08, respectively. Three-dimensional reconstructed MR imaging is a useful method for recognizing persistent left superior vena cava and precise examination of the chest radiographs often allowed detection of the vascular shadows caused by this anomaly. (author)

  6. Chemical Exchange Saturation Transfer MR Imaging Is Superior to Diffusion Tensor Imaging in the Diagnosis and Severity Evaluation of Parkinson's Disease: a Study on Substantia Nigra and Striatum

    Directory of Open Access Journals (Sweden)

    Chunmei eLi

    2015-10-01

    Full Text Available Parkinson’s disease (PD is a neurodegenerative disorder characterized by nigrostriatal cell loss. To date the diagnosis of PD is still based primarily on the clinical manifestations which may be typical and obvious only in advanced-stage PD. Thus, it is crucial to find a reliable marker for the diagnosis of PD. We conducted this study to assess the diagnostic efficiency of chemical-exchange-saturation-transfer (CEST imaging and diffusion-tensor imaging (DTI in PD at 3 Tesla by evaluating changes on substantia nigra and striatum. Twenty-three PD patients and twenty-three age-matched normal controls were recruited. All patients and controls were imaged on a 3 Tesla MR system, using an 8-channel head coil. CEST imaging was acquired in two transverse slices of the head, including substantia nigra and striatum. The magnetization-transfer-ratio asymmetry at 3.5 ppm, MTRasym(3.5ppm, and the total CEST signal intensity between 0 and 4 ppm were calculated. Multi-slice DTI was acquired for all the patients and normal controls. Quantitative analysis was performed on the substantia nigra, globus pallidus, putamen and caudate. The MTRasym(3.5ppm value, the total CEST signal intensity and fractional anisotropy (FA value of the substantia nigra were all significantly lower in PD patients than in normal controls (P = 0.003, P = 0.004 and P < 0.001, respectively. The MTRasym(3.5ppm values of the putamen and the caudate were significantly higher in PD patients than in normal controls (P = 0.010 and P = 0.009, respectively. There were no significant differences for the mean diffusivity (MD in these four regions between PD patients and normal controls. In conclusion, CEST MR imaging provided multiple CEST image contrasts in the substantia nigra and the striatum in PD and may be superior to DTI in the diagnosis of PD.

  7. The Role of the Superior Order GLCM in the Characterization and Recognition of the Liver Tumors from Ultrasound Images

    Directory of Open Access Journals (Sweden)

    D. Mitrea

    2012-04-01

    Full Text Available The hepatocellular carcinoma (HCC is the most frequent malignant liver tumor. It often has a similar visual aspect with the cirrhotic parenchyma on which it evolves and with the benign liver tumors. The golden standard for HCC diagnosis is the needle biopsy, but this is an invasive, dangerous method. We aim to develop computerized,noninvasive techniques for the automatic diagnosis of HCC, based on information obtained from ultrasound images. The texture is an important property of the internal organs tissue, able to provide subtle information about the pathology. We previously defined the textural model of HCC, consisting in the exhaustive set of the relevant textural features, appropriate for HCC characterization and in the specific values of these features. In this work, we analyze the role that the superior order Grey Level Cooccurrence Matrices (GLCM and the associated parameters have in the improvement of HCC characterization and automatic diagnosis. We also determine the best spatial relations between the pixels that lead to the highest performances, for the third, fifth and seventh order GLCM. The following classes will be considered: HCC, cirrhotic liver parenchyma on which it evolves and benign liver tumors.

  8. Editorial Commentary: Lesions of the Superior Labrum From Anterior to Posterior (SLAP) Are a Slap in the Face to the Traditional Trinity of History, Examination, and Imaging.

    Science.gov (United States)

    Lubowitz, James H

    2015-12-01

    Superior labrum from anterior to posterior (SLAP) lesions are a slap in the face to the revered trinity of history, physical examination, and imaging. SLAP lesions are difficult to diagnose, and arthroscopy is not only the gold standard, but the current method on which expert arthroscopic shoulder subspecialists rely.

  9. Morphologic Study of Superior Temporal Sulcus-Amygdaloid Body and Lateral Fissure-Amygdaloid Body Surgical Approach by Using Magnetic Resonance Imaging Volume Rendering.

    Science.gov (United States)

    Qu, Yuan; Ren, Bichen; Chang, Xiaoyu; Zhang, Jinnan; Li, Youqiong; Duan, Haobo; Cheng, Kailiang; Wang, Jincheng

    2016-01-01

    In this research, 83 patients were measured by magnetic resonance imaging volume rendering technique. The authors acquired the curve length of the superior temporal sulcus and the lateral fissure on the cerebral hemisphere, the shortest distance from the superior temporal sulcus and the lateral fissure to the center of amygdaloid body separately, the vertical diameter, the transversal diameter, and the anteroposterior diameter of the amygdaloid body and the 2 approach angles between the median sagittal plane and the shortest segment from the superior temporal sulcus to the center of amygdaloid body and the shortest segment from lateral fissure to the center of the amygdaloid body. At the same time, we preliminarily oriented the 2 points of the superior temporal sulcus and the lateral fissure, which are closest to the center of amygdaloid body, aimed at finding out the best entrance points of surgical approach through the superior temporal sulcus and the lateral fissure to the amygdaloid body and reducing the damage to the nerve fibers or blood vessels during the operation. The results indicate that the point at the front side 1/4 of the superior temporal sulcus may be the ideal surgical approach entrance point and the point at the front side 1/3 of the lateral fissure. There is no difference between 2 cerebral hemispheres (P < 0.05).

  10. Imaging with {sup 124}I in differentiated thyroid carcinoma: is PET/MRI superior to PET/CT?

    Energy Technology Data Exchange (ETDEWEB)

    Binse, I.; Poeppel, T.D.; Ruhlmann, M.; Gomez, B.; Bockisch, A.; Rosenbaum-Krumme, S.J. [University of Duisburg-Essen, Medical Faculty, Department of Nuclear Medicine, Essen (Germany); Umutlu, L. [University of Duisburg-Essen, Medical Faculty, Department of Radiology, Essen (Germany)

    2016-06-15

    The aim of this study was to compare integrated PET/CT and PET/MRI for their usefulness in detecting and categorizing cervical iodine-positive lesions in patients with differentiated thyroid cancer using {sup 124}I as tracer. The study group comprised 65 patients at high risk of iodine-positive metastasis who underwent PET/CT (low-dose CT scan, PET acquisition time 2 min; PET/CT{sub 2}) followed by PET/MRI of the neck 24 h after {sup 124}I administration. PET images from both modalities were analysed for the numbers of tracer-positive lesions. Two different acquisition times were used for the comparisons, one matching the PET/CT{sub 2} acquisition time (2 min, PET/MRI{sub 2}) and the other covering the whole MRI scan time (30 min, PET/MRI{sub 30}). Iodine-positive lesions were categorized as metastasis, thyroid remnant or inconclusive according to their location on the PET/CT images. Morphological information provided by MRI was considered for evaluation of lesions on PET/MRI and for volume information. PET/MRI{sub 2} detected significantly more iodine-positive metastases and thyroid remnants than PET/CT{sub 2} (72 vs. 60, p = 0.002, and 100 vs. 80, p = 0.001, respectively), but the numbers of patients with at least one tumour lesion identified were not significantly different (21/65 vs. 17/65 patients). PET/MRI{sub 30} tended to detect more PET-positive metastases than PET/MRI{sub 2} (88 vs. 72), but the difference was not significant (p = 0.07). Of 21 lesions classified as inconclusive on PET/CT, 5 were assigned to metastasis or thyroid remnant when evaluated by PET/MRI. Volume information was available in 34 % of iodine-positive metastases and 2 % of thyroid remnants on PET/MRI. PET/MRI of the neck was found to be superior to PET/CT in detecting iodine-positive lesions. This was attributed to the higher sensitivity of the PET component, Although helpful in some cases, we found no substantial advantage of PET/MRI over PET/CT in categorizing iodine

  11. Magnetic resonance imaging arthrography following type II superior labrum from anterior to posterior repair: interobserver and intraobserver reliability

    Directory of Open Access Journals (Sweden)

    Kurji HM

    2015-11-01

    Full Text Available Hafeez M Kurji,1 Yohei Ono,2,3 Atiba A Nelson,2 Kristie D More,2 Ben Wong,4 Corinne Dyke,4 Richard S Boorman,2 Gail M Thornton,2,5 Ian KY Lo2 1College of Medicine, University of Saskatchewan, Saskatoon, SK, Canada; 2Department of Surgery, Section of Orthopaedic Surgery, McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, AB, Canada; 3Department of Orthopedic Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan; 4Department of Radiology, University of Calgary, Calgary, AB, Canada; 5Department of Orthopaedics, University of British Columbia, Vancouver, BC, Canada Background: Arthroscopic repair of type II superior labrum from anterior to posterior (SLAP lesions is a common surgical procedure. However, anatomic healing following repair has rarely been investigated. The intraobserver and interobserver reliability of magnetic resonance imaging arthrography (MRA following type II SLAP repair has not previously been investigated. This is of particular interest due to recent reports of poor clinical results following type II SLAP lesion repair. Purpose: To evaluate the MRA findings following arthroscopic type II SLAP lesion repair and determine its intraobserver and interobserver reliability. Study design: Cohort study (diagnosis, Level of Evidence, 2. Methods: Twenty-five patients with an isolated type II SLAP lesion (confirmed via diagnostic arthroscopy underwent standard suture anchor-based repair. At a mean of 25.2 months postoperatively, patients underwent a standardized MRA protocol to investigate the integrity of the repair. MRAs were independently reviewed by two radiologists and a fellowship trained shoulder surgeon. The outcomes were classified as healed SLAP repair or re-torn SLAP repair. Results: On average, 54% of MRAs were interpreted as healed SLAP repairs while 46% of MRAs were interpreted as having a re-torn SLAP repair. Overall, only 43% of the studies had 100% agreement across all

  12. Kinematic magnetic resonance imaging (MRI of the normal shoulder: assessment of the shapes and signals of the superior and inferior labra with abductive movement using an open-type imager.

    Directory of Open Access Journals (Sweden)

    Togami I

    2001-08-01

    Full Text Available A preliminary study was conducted to evaluate the superior and inferior glenoid labra with abductive movement using an open-type MR unit in asymptomatic healthy volunteers. Both fast low angle shot (FLASH and turbo spin echo (TSE images were obtained to evaluate the shapes of both the superior and inferior labra, as well as to assess changes in signal at these sites. As the abduction angle was increased, the shape of the superior labrum changed from round or triangular to crescentic and a higher signal was frequently seen. At an abduction angle of 150 degrees, an increase in signal was seen in one-half of the superior labra; this increase was noted more frequently in volunteers over 40 years of age. In some of the superior labra, the increase in signal seen at 150 degrees abduction disappeared on subsequent images obtained at 0 degrees abduction. Hence, the increase in signal was considered to be a reversible change. The shape of the inferior labrum tended to change from crescentic to triangular or round. An increase in signal in the inferior labrum was unrelated to the abduction angle. Abductive kinematic studies using an open-type MR unit provides information about the morphology of the superior and inferior labra, as well as information about signal changes occurring at these sites.

  13. Kinematic magnetic resonance imaging (MRI) of the normal shoulder. Assessment of the shapes and signals of the superior and inferior labra with abductive movement using an open-type imager

    Energy Technology Data Exchange (ETDEWEB)

    Togami, Izumi; Sasai, Nobuya; Tsunoda, Masatoshi [Okayama Univ. (Japan). School of Medicine] (and others)

    2001-08-01

    A preliminary study was conducted to evaluate the superior and inferior glenoid labra with abductive movement using an open-type MR unit in asymptomatic healthy volunteers. Both fast low angle shot (FLASH) and turbo spin echo (TSE) images were obtained to evaluate the shapes of both the superior and inferior labra, as well as to assess changes in signal at these sites. As the abduction angle was increased, the shape of the superior labrum changed from round or triangular to crescentic and a higher signal was frequently seen. At an abduction angle of 150deg, an increase in signal was seen in one-half of the superior labra; this increase was noted more frequently in volunteers over 40 years of age. In some of the superior labra, the increase in signal seen at 150deg abduction disappeared on subsequent images obtained at 0deg abduction. Hence, the increase in signal was considered to be a reversible change. The shape of the inferior labrum tended to change from crescentic to triangular or round. An increase in signal in the inferior labrum was unrelated to the abduction angle. Abductive kinematic studies using an open-type MR unit provides information about the morphology of the superior and inferior labra, as well as information about signal changes occurring at these sites. (author)

  14. EUS is superior for detection of pancreatic lesions compared with standard imaging in patients with multiple endocrine neoplasia type 1.

    Science.gov (United States)

    van Asselt, Sophie J; Brouwers, Adrienne H; van Dullemen, Hendrik M; van der Jagt, Eric J; Bongaerts, Alfons H H; Kema, Ido P; Koopmans, Klaas P; Valk, Gerlof D; Timmers, Henri J; de Herder, Wouter W; Feelders, Richard A; Fockens, Paul; Sluiter, Wim J; de Vries, Elisabeth G E; Links, Thera P

    2015-01-01

    In multiple endocrine neoplasia type 1 (MEN1), pancreatic neuroendocrine tumors (pNETs) are the leading MEN1-related cause of death. To evaluate EUS and (11)C-5-hydroxytryptophan positron emission tomography ((11)C-5-HTP PET), compared with the recommended screening techniques in MEN1 patients for early detection of pNETs. Cross-sectional study. Tertiary-care university medical center. This study involved 41 patients with a proven MEN1 mutation or with one MEN1 manifestation and a mutation carrier as a first-degree family member, with recent screening by abdominal CT or magnetic resonance imaging (MRI) and somatostatin receptor scintigraphy (SRS). EUS by using a linear Pentax echoendoscope and Hitachi EUB-525 and (11)C-5-HTP PET. Patient-based and lesion-based positivity for pNET was calculated for all imaging techniques. The McNemar test was used to compare the yield of the 4 imaging techniques. In 35 of 41 patients, 107 pancreatic lesions were detected in total. EUS detected 101 pancreatic lesions in 34 patients, (11)C-5-HTP PET detected 35 lesions in 19 patients, and CT/MRI + SRS detected 32 lesions in 18 patients (P HTP PET performed similarly to CT/MRI + SRS and better compared with SRS only (13 lesions in 12 patients), both at a patient-based and lesion-based level (P HTP PET is not useful. We recommend EUS as the first-choice pancreas imaging technique in patients with MEN1. ( NTR1668.). Copyright © 2015 American Society for Gastrointestinal Endoscopy. Published by Elsevier Inc. All rights reserved.

  15. Altered activity and functional connectivity of superior temporal gyri in anxiety disorders: A functional magnetic resonance imaging study

    Energy Technology Data Exchange (ETDEWEB)

    Zhao, Xiaohu; Xi, Qian; Wang, Peijun; Li, Chunbo [Tong Ji Hospital of Tong Ji University, Shanghai (China); He, Hongjian [Bio-X lab, Dept. of Physics, Zhe Jiang University, Hangzhou (China)

    2014-08-15

    The prior functional MRI studies have demonstrated significantly abnormal activity in the bilateral superior temporal gyrus (STG) of anxiety patients. The purpose of the current investigation was to determine whether the abnormal activity in these regions was related to a loss of functional connectivity between these regions. Ten healthy controls and 10 anxiety patients underwent noninvasive fMRI while actively listening to emotionally neutral words alternated by silence (Task 1) or threat-related words (Task 2). The participants were instructed to silently make a judgment of each word's valence (i.e., unpleasant, pleasant, or neutral). A coherence analysis was applied to the functional MRI data to examine the functional connectivity between the left and the right STG, which was selected as the primary region of interest on the basis of our prior results. The data demonstrated that the anxiety patients exhibited significantly increased activation in the bilateral STG than the normal controls. The functional connectivity analysis indicated that the patient group showed significantly decreased degree of connectivity between the bilateral STG during processing Task 2 compared to Task 1 (t = 2.588, p = 0.029). In addition, a significantly decreased connectivity was also observed in the patient group compared to the control group during processing Task 2 (t = 2.810, p = 0.012). Anxiety patients may exhibit increased activity of the STG but decreased functional connectivity between the left and right STG, which may reflect the underlying neural abnormality of anxiety disorder, and this will provide new insights into this disease.

  16. Detection of lymph node in the neck and superior mediastinal area in the cases of esophageal cancer using magnetic resonance imaging (MRI)

    Energy Technology Data Exchange (ETDEWEB)

    Yano, Yoshimasa [Chiba Univ. (Japan). School of Medicine

    1998-12-01

    We devised the following three imaging plane of MRI for detection of lymph nodes in the neck and superior mediastinal area. Those are carotid artery plane, trachea-bronchus plane and trachea-axial plane. MRI was performed in 42 patients of esophageal cancer. This method was useful for a classification of lymph nodes on the basis of ``Guide Lines for the Clinical and Pathologic Studies on Carcinoma of Esophagus`` by Japanese Society for Esophageal Diseases, because the structure which became a border line was visualized distinctly. The detectability of lymph nodes according to size was 22.5% (less than 5 mm), 70.0% (more than 5 mm and less than 10 mm) and 80.1% (more than 10 mm). The highly detectable locations were cervical paraesophageal, deep cervical, supraclavicular, thoracic paraesophageal and thoracheal bifurcational lymph nodes. Compared with EUS and Dynamic CT, the detectability of lymph nodes by this method (MRI) was statistically significantly higher, and that of metastatic ones was superior, too. Thus, it was found that identification of lymph nodes by the location and the size can be easy using three planes of MRI, and that we can reveal the positional relationship between lymph nodes and the adjacent organs such as the trachea or large vessels. (author)

  17. Anatomy, variants, and pathologies of the superior glenohumeral ligament: Magnetic resonance imaging with three-dimensional volumetric interpolated breath-hold examination sequence and conventional magnetic resonance arthrography

    Energy Technology Data Exchange (ETDEWEB)

    Ogul, Hayri; Karaca, Leyla; Emre, Cahit; Pirimoglu, Berhan; Tuncer, Kutsi; Topai, Murat; Okur, Aylin; Kantarci, Mecit [Medical Faculty, Ataturk University, Erzurum (Turkmenistan)

    2014-08-15

    The purpose of this review was to demonstrate magnetic resonance (MR) arthrography findings of anatomy, variants, and pathologic conditions of the superior glenohumeral ligament (SGHL). This review also demonstrates the applicability of a new MR arthrography sequence in the anterosuperior portion of the glenohumeral joint. The SGHL is a very important anatomical structure in the rotator interval that is responsible for stabilizing the long head of the biceps tendon. Therefore, a torn SGHL can result in pain and instability. Observation of the SGHL is difficult when using conventional MR imaging, because the ligament may be poorly visualized. Shoulder MR arthrography is the most accurately established imaging technique for identifying pathologies of the SGHL and associated structures. The use of three dimensional (3D) volumetric interpolated breath-hold examination (VIBE) sequences produces thinner image slices and enables a higher in-plane resolution than conventional MR arthrography sequences. Therefore, shoulder MR arthrography using 3D VIBE sequences may contribute to evaluating of the smaller intraarticular structures such as the SGHL.

  18. Casein-Coated Fe5C2 Nanoparticles with Superior r2 Relaxivity for Liver-Specific Magnetic Resonance Imaging.

    Science.gov (United States)

    Cowger, Taku A; Tang, Wei; Zhen, Zipeng; Hu, Kai; Rink, David E; Todd, Trever J; Wang, Geoffrey D; Zhang, Weizhong; Chen, Hongmin; Xie, Jin

    2015-01-01

    Iron oxide nanoparticles have been extensively used as T2 contrast agents for liver-specific magnetic resonance imaging (MRI). The applications, however, have been limited by their mediocre magnetism and r2 relaxivity. Recent studies show that Fe5C2 nanoparticles can be prepared by high temperature thermal decomposition. The resulting nanoparticles possess strong and air stable magnetism, suggesting their potential as a novel type of T2 contrast agent. To this end, we improve the synthetic and surface modification methods of Fe5C2 nanoparticles, and investigated the impact of size and coating on their performances for liver MRI. Specifically, we prepared 5, 14, and 22 nm Fe5C2 nanoparticles and engineered their surface by: 1) ligand addition with phospholipids, 2) ligand exchange with zwitterion-dopamine-sulfonate (ZDS), and 3) protein adsorption with casein. It was found that the size and surface coating have varied levels of impact on the particles' hydrodynamic size, viability, uptake by macrophages, and r2 relaxivity. Interestingly, while phospholipid- and ZDS-coated Fe5C2 nanoparticles showed comparable r2, the casein coating led to an r2 enhancement by more than 2 fold. In particular, casein coated 22 nm Fe5C2 nanoparticle show a striking r2 of 973 mM(-1)s(-1), which is one of the highest among all of the T2 contrast agents reported to date. Small animal studies confirmed the advantage of Fe5C2 nanoparticles over iron oxide nanoparticles in inducing hypointensities on T2-weighted MR images, and the particles caused little toxicity to the host. The improvements are important for transforming Fe5C2 nanoparticles into a new class of MRI contrast agents. The observations also shed light on protein-based surface modification as a means to modulate contrast ability of magnetic nanoparticles.

  19. Clinic misdiagnosis and imaging analysis of superior sulcus tumors of pulmonary%肺上沟瘤的临床误诊分析及影像诊断

    Institute of Scientific and Technical Information of China (English)

    王长彬; 李敏

    2014-01-01

    目的:分析肺上沟瘤的误诊原因及影像学表现,提高临床医生对本病的认识。方法回顾性分析19例经病理证实的肺上沟瘤患者的临床表现、影像学表现及误诊情况。结果19例肺上沟瘤患者中,病史2.6~9.7个月不等,19例中17例有肩背部疼痛,15例有颈部疼痛,14例有前臂疼痛,11例有手放射性疼痛,6例患者出现霍纳综合征;疼痛程度(VAS法)4~7分不等。19例中16例曾误诊,其中误诊为肩周炎9例,颈椎病4例,颈肩综合症3例。有5例常规X线胸片检查未见明显异常,摄前弓位片显示肺尖软组织密度影。C T均显示一侧肺尖部软组织密度增高影,其中有17例患者肿瘤累及到肋骨,15例患者累及到T 1或T 2椎体,11例患者锁骨下动脉受累,13例患者锁骨下静脉受累,10例患者肿瘤同时累及到T1和第一肋骨,7例患者锁骨下动脉及锁骨下静脉同时受累。结论肩背部疼痛是肺上沟瘤最常见的首发症状,肺上沟瘤容易误诊,发现时多为中晚期,前弓位X线胸片及多层螺旋CT (应用多平面重建技术)对肺上沟瘤的诊断有很大的价值,对临床诊断及治疗具有重要意义。%Objective To analyze misdiagnosis reason and imaging characteristics of superior sulcus tumors of pulmonary so as to improve the diagnostic accuracy .Methods The clinical symptoms ,imaging findings and misdiagnosis reasons of 19 cases of superior sulcus tumors of pulmonary were investigated retrospectively .Results In the 19 patients with superi‐or sulcus tumors of pulmonary ,medical history were about 2 .6~9 .7 months .The earliest clinical symptoms included pain in shoulder and back (n=17 cases) ,neck pain (n=15 cases) ,upper extremity pain (n=14 cases) ,hand radiated pain (n=11 cases) ,and Horner’ syndrome (n=6 cases) .According to VAS method ,the pain degrees were 4~7 scores .16 out of the 19 cases were misdiagnosed :9 patients

  20. Intracranially protruded bilateral posterior and superior SCCs with multiple dehiscences in a patient with positional vertigo: CT and MR imaging findings and review of literature

    Directory of Open Access Journals (Sweden)

    Nischal G Kundaragi

    2014-01-01

    Full Text Available We report a rare case of intracranially protruded posterior and superior semicircular canals beyond the margins of temporal bone with bony roof dehiscence in bilateral posterior and left superior semicircular canals in a patient with benign paroxysmal positional vertigo (BPPV.

  1. Chemical Exchange Saturation Transfer MR Imaging is Superior to Diffusion-Tensor Imaging in the Diagnosis and Severity Evaluation of Parkinson's Disease: A Study on Substantia Nigra and Striatum.

    Science.gov (United States)

    Li, Chunmei; Wang, Rui; Chen, Haibo; Su, Wen; Li, Shuhua; Zhao, Xuna; Zhou, Jinyuan; Qiao, Jian; Lou, Baohui; Song, Guodong; Chen, Min

    2015-01-01

    Parkinson's disease (PD) is a neurodegenerative disorder characterized by nigrostriatal cell loss. To date, the diagnosis of PD is still based primarily on the clinical manifestations, which may be typical and obvious only in advanced-stage PD. Thus, it is crucial to find a reliable marker for the diagnosis of PD. We conducted this study to assess the diagnostic efficiency of chemical exchange saturation transfer (CEST) imaging and diffusion-tensor imaging (DTI) in PD at 3 T by evaluating changes on substantia nigra and striatum. Twenty-three PD patients and twenty-three age-matched normal controls were recruited. All patients and controls were imaged on a 3-T MR system, using an eight-channel head coil. CEST imaging was acquired in two transverse slices of the head, including substantia nigra and striatum. The magnetization transfer ratio asymmetry at 3.5 ppm, MTRasym(3.5 ppm), and the total CEST signal intensity between 0 and 4 ppm were calculated. Multi-slice DTI was acquired for all the patients and normal controls. Quantitative analysis was performed on the substantia nigra, globus pallidus, putamen, and caudate. The MTRasym(3.5 ppm) value, the total CEST signal intensity, and fractional anisotropy value of the substantia nigra were all significantly lower in PD patients than in normal controls (P = 0.003, P = 0.004, and P diffusivity in these four regions between PD patients and normal controls. In conclusion, CEST MR imaging provided multiple CEST image contrasts in the substantia nigra and the striatum in PD and may be superior to DTI in the diagnosis of PD.

  2. Rapid diagnosis and management of thoracic aortic dissection and intramural haematoma: a prospective study of advantages of multiplane vs. biplane transoesophageal echocardiography.

    Science.gov (United States)

    Pepi, M; Campodonico, J; Galli, C; Tamborini, G; Barbier, P; Doria, E; Maltagliati, A; Alimento, M; Spirito, R

    2000-03-01

    The purposes of this study were to compare the accuracy of multiplane vs. biplane transoesophageal echocardiography (TEE) in the diagnosis of aortic dissection and aortic intramural haematoma, and to test whether these techniques provide all the diagnostic information required to make management decisions. Fifty-eight consecutive patients with clinically suspected aortic dissection were studied with multiplane TEE; all cases who required surgery underwent intraoperative monitoring with multiplane TEE. The following multiplane TEE data were analysed: the angle between current and 0 degrees plane at which each view was obtained; the success rate in the evaluation of true and false lumen, entry tear, coronary artery involvement, aortic regurgitation, pericardial effusion. Advantages of multiplane over biplane TEE have been evaluated by the demonstration of usefulness of views obtained in planes other than 0 degrees-20 degrees or 70 degrees-110 degrees, assuming that with manipulation of a biplane probe a 20 degrees arc could be added to the conventional horizontal and vertical planes. On the basis of TEE findings, aortic dissection was confirmed in 36 cases (18 type A, 12 type B, six intramural haematoma). The specificity and sensitivity of TEE in terms of the presence or absence of aortic dissection or intramural haematoma were 100%. An additional clinical value of multiplane over biplane TEE in the evaluation of ascending aorta, aortic arch, entry tears and coronary artery involvement was demonstrated. All cases with type A aortic dissection or intramural haematoma involving the ascending aorta had an operation that was performed immediately after the diagnosis (hospital mortality, 13%). Patients with type B aortic dissection were treated medically; 25% of these cases were operated later (hospital mortality, 0%). Multiplane and biplane TEE have excellent and similar accuracies in the evaluation of aortic dissection and intramural haematoma. Multiplane TEE improves

  3. La técnica de exploración con Imagen de Banda Estrecha o Narrow Band Imaging (NBI) en carcinomas epidermoides de la vía aerodigestiva superior

    OpenAIRE

    Barberá Durbán, Rafael

    2014-01-01

    INTRODUCCIÓN: La mayoría de las neoplasias malignas de cabeza y cuello son carcinomas epidermoides originados en la vía aerodigestiva superior. Debido a su localización preferente en la superficie de la mucosa, la exploración endoscópica en la consulta es fundamental. Para mejorar la exploración visual endoscópica de las lesiones y tratar de aislarlas de la mucosa sana se ha desarrollado la técnica de exploración con luz de banda estrecha (Narrow Band Imaging o NBI). Inicialmente utilizada pa...

  4. Superior Hiking Trail

    Data.gov (United States)

    Minnesota Department of Natural Resources — Superior Hiking Trail main trail, spurs, and camp spurs for completed trail throughout Cook, Lake, St. Louis and Carlton counties. These data were collected with...

  5. Bathymetry of Lake Superior

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Bathymetry of Lake Superior has been compiled as a component of a NOAA project to rescue Great Lakes lake floor geological and geophysical data and make it more...

  6. Superior Hiking Trail Facilities

    Data.gov (United States)

    Minnesota Department of Natural Resources — Superior Hiking Trail main trail, spurs, and camp spurs for completed trail throughout Cook, Lake, St. Louis and Carlton counties. These data were collected with...

  7. Usefulness of an accelerated transoesophageal stress echocardiography in the preoperative evaluation of high risk severely obese subjects awaiting bariatric surgery

    Directory of Open Access Journals (Sweden)

    Tessier Michel

    2010-07-01

    Full Text Available Abstract Background Severe obesity is associated with an increased risk of coronary artery disease (CAD. Bariatric surgery is an effective procedure for long term weight management as well as reduction of comorbidities. Preoperative evaluation of cardiac operative risk may often be necessary but unfortunately standard imaging techniques are often suboptimal in these subjects. The purpose of this study was to demonstrate the feasibility, safety and utility of transesophageal dobutamine stress echocardiography (TE-DSE using an adapted accelerated dobutamine infusion protocol in severely obese subjects with comorbidities being evaluated for bariatric surgery for assessing the presence of myocardial ischemia. Methods Subjects with severe obesity [body mass index (BMI >40 kg/m2] with known or suspected CAD and being evaluated for bariatric surgery were recruited. Results Twenty subjects (9M/11F, aged 50 ± 8 years (mean ± SD, weighing 141 ± 21 kg and with a BMI of 50 ± 5 kg/m2 were enrolled in the study and underwent a TE-DSE. The accelerated dobutamine infusion protocol used was well tolerated. Eighteen (90% subjects reached their target heart rate with a mean intubation time of 13 ± 4 minutes. Mean dobutamine dose was 31.5 ± 9.9 ug/kg/min while mean atropine dose was 0.5 ± 0.3 mg. TE-DSE was well tolerated by all subjects without complications including no significant arrhythmia, hypotension or reduction in blood arterial saturation. Two subjects had abnormal TE-DSE suggestive of myocardial ischemia. All patients underwent bariatric surgery with no documented cardiovascular complications. Conclusions TE-DSE using an accelerated infusion protocol is a safe and well tolerated imaging technique for the evaluation of suspected myocardial ischemia and cardiac operative risk in severely obese patients awaiting bariatric surgery. Moreover, the absence of myocardial ischemia on TE-DSE correlates well with a low operative risk of cardiac event.

  8. PERSISTENT LEFT SUPERIOR VENACAVA

    Directory of Open Access Journals (Sweden)

    Devinder Singh

    2014-05-01

    Full Text Available A Persistent Left Superior Venacava (PLSVC is the most common variation of the thoracic venous system and rare congenital vascular anomaly and is prevalent in 0.3% of the population. It may be associated with other cardiovascular abnormalities including atrial septal defect, bicuspid aortic valve, coarctation of aorta, coronary sinus ostial atresia, and cor triatriatum. Incidental rotation of a dilated coronary sinus on echocardiography should raise the suspicion of PLSVC. The diagnosis should be confirmed by saline contrast echocardiography. Condition is usually asymptomatic. Here we present a rare case of persistent left superior vena cava presented in OPD with dyspnoea & palpitations.

  9. Air Superiority Fighter Characteristics.

    Science.gov (United States)

    1998-06-05

    many a dispute could have been deflated into a single paragraph if the disputants had just dared to define their terms.7 Aristotle ...meaningful. This section will expand on some key ideology concepts. The phrase "air superiority fighter" may bring to mind visions of fighter... biographies are useful in garnering airpower advocate theories as well as identifying key characteristics. Air campaign results, starting with World

  10. A comparison of two-dimensional and real-time 3D transoesophageal echocardiography and angiography for assessing the left atrial appendage anatomy for sizing a left atrial appendage occlusion system: impact of volume loading.

    Science.gov (United States)

    Al-Kassou, Baravan; Tzikas, Apostolos; Stock, Friederike; Neikes, Fabian; Völz, Alexander; Omran, Heyder

    2017-04-20

    Correct sizing of a left atrial appendage (LAA) closure system is important to avoid redeployment of the device and peri-device leaks. The aims of this study were to assess the significance of two-dimensional transoesophageal echocardiography (2D-TEE), real-time 3D transoesophageal echocardiography (RT 3D-TEE) and angiography for measuring the size of the LAA landing zone and to determine the impact on sizing an LAA closure device. Furthermore, we investigated the relevance of volume loading on LAA size. In a prospective study, 46 patients underwent 2D-TEE and RT 3D-TEE 24 hours prior to LAA closure, at the beginning of the procedure and just before the procedure after volume loading with an average of 1,035±246 ml. Angiography was performed immediately before the implantation. Maximal diameter (2.2±0.4 versus 2.3±0.4 cm; pcorrelation (R) between measurements and LAA device size was found for RT 3D-TEE-derived perimeter (R=0.97) and area (R=0.96), whereas the maximal diameter (R=0.78) measured by 2D-TEE and angiography (R=0.76) correlated less closely. Sizing based on an RT 3D-TEE-measured perimeter resulted only in 4% of undersizing the implanted device. Peri-device leaks occurred in seven cases (15%) and were associated with a lower compression of LAA devices (7±1.3% versus 14±3.2% for patients without leaks, pcorrelation to LAA closure device size than 2D-TEE or angiographic measurements.

  11. Myocardial perfusion imaging (MPI) is superior to the demonstration of distal collaterals in predicting cardiac events in chronic total occlusion (CTO).

    Science.gov (United States)

    Wright, Samuel; Lichtenstein, Meir; Grigg, Leeanne; Sivaratnam, Dinesh

    2013-08-01

    In chronic total occlusion (CTO), the evidence for revascularization is less robust than for stable angina. A medical therapy strategy is common and often based on distal collateralization, regardless of the presence of ischemia. The aim of this study was to examine the correlation between distal collateralization, myocardial perfusion imaging (MPI), and hard cardiac events (HCE) in CTO. Retrospective analysis of consecutive patients undergoing coronary angiography revealed 21 non-revascularized patients with CTO and MPI, over a 24-month period. Blinded review of patient charts, MPI, and angiography was undertaken. HCE of death, myocardial infarct, and unstable angina were assessed. Mean follow up was 23 months. Summed difference scores were calculated on a 17-segment model and collaterals graded on the Rentrop scale. 43% of patients had HCE, and 62% had collaterals. Ischemia on MPI accurately predicted HCE in CTO (60% vs 0%, P = .01). Distal collateralization failed to predict freedom from ischemia on MPI (31% vs 25%, P = .53) or HCE (31% vs 62%, P = .15). MPI in patients with CTO accurately predicted HCE. This allows for accurate triage of patients by MPI for consideration of revascularization. Patients without ischemia can be safely managed with optimal medical therapy. The presence of collateralization did not predict either ischemia or HCE.

  12. Longitudinal Long-term Magnetic Resonance Imaging and Clinical Follow-up After Single-Row Arthroscopic Rotator Cuff Repair: Clinical Superiority of Structural Tendon Integrity.

    Science.gov (United States)

    Heuberer, Philipp R; Smolen, Daniel; Pauzenberger, Leo; Plachel, Fabian; Salem, Sylvia; Laky, Brenda; Kriegleder, Bernhard; Anderl, Werner

    2017-05-01

    The number of arthroscopic rotator cuff surgeries is consistently increasing. Although generally considered successful, the reported number of retears after rotator cuff repair is substantial. Short-term clinical outcomes are reported to be rarely impaired by tendon retears, whereas to our knowledge, there is no study documenting long-term clinical outcomes and tendon integrity after arthroscopic rotator cuff repair. To investigate longitudinal long-term repair integrity and clinical outcomes after arthroscopic rotator cuff reconstruction. Case series; Level of evidence, 4. Thirty patients who underwent arthroscopic rotator cuff repair with suture anchors for a full-tendon full-thickness tear of the supraspinatus or a partial-tendon full-thickness tear of the infraspinatus were included. Two and 10 years after initial arthroscopic surgery, tendon integrity was analyzed using magnetic resonance imaging (MRI). The University of California, Los Angeles (UCLA) score and Constant score as well as subjective questions regarding satisfaction with the procedure and return to normal activity were used to evaluate short- and long-term outcomes. At the early MRI follow-up, 42% of patients showed a full-thickness rerupture, while 25% had a partial rerupture, and 33% of tendons remained intact. The 10-year MRI follow-up (129 ± 11 months) showed 50% with a total rerupture, while the other half of the tendons were partially reruptured (25%) or intact (25%). The UCLA and Constant scores significantly improved from preoperatively (UCLA total: 50.6% ± 20.2%; Constant total: 44.7 ± 10.5 points) to 2 years (UCLA total: 91.4% ± 16.0% [ P integrity important goals of future research efforts.

  13. Contabilidad Financiera Superior

    OpenAIRE

    Ipiñazar Petralanda, Izaskun

    2013-01-01

    Duración (en horas): De 31 a 40 horas. Destinatario: Estudiante y Docente A través de este material se presentan las pautas necesarias para implementar un aprendizaje basado en problemas en la asignatura de Contabilidad Financiera Superior dentro de los temas “Constitución de S.A. y S.R.L.” (Tema 2), “Ampliaciones de Capital” (Tema 3) y “Reducciones de Capital” (Tema 4). En primer lugar se presentan las guías generales de la asignatura, y a continuación, las diferentes activida...

  14. Contabilidad Financiera Superior

    OpenAIRE

    Ipiñazar Petralanda, Izaskun

    2013-01-01

    Duración (en horas): De 31 a 40 horas. Destinatario: Estudiante y Docente A través de este material se presentan las pautas necesarias para implementar un aprendizaje basado en problemas en la asignatura de Contabilidad Financiera Superior dentro de los temas “Constitución de S.A. y S.R.L.” (Tema 2), “Ampliaciones de Capital” (Tema 3) y “Reducciones de Capital” (Tema 4). En primer lugar se presentan las guías generales de la asignatura, y a continuación, las diferentes activida...

  15. Statistics of superior records

    Science.gov (United States)

    Ben-Naim, E.; Krapivsky, P. L.

    2013-08-01

    We study statistics of records in a sequence of random variables. These identical and independently distributed variables are drawn from the parent distribution ρ. The running record equals the maximum of all elements in the sequence up to a given point. We define a superior sequence as one where all running records are above the average record expected for the parent distribution ρ. We find that the fraction of superior sequences SN decays algebraically with sequence length N, SN˜N-β in the limit N→∞. Interestingly, the decay exponent β is nontrivial, being the root of an integral equation. For example, when ρ is a uniform distribution with compact support, we find β=0.450265. In general, the tail of the parent distribution governs the exponent β. We also consider the dual problem of inferior sequences, where all records are below average, and find that the fraction of inferior sequences IN decays algebraically, albeit with a different decay exponent, IN˜N-α. We use the above statistical measures to analyze earthquake data.

  16. Frenillo labial superior doble

    Directory of Open Access Journals (Sweden)

    Carlos Albornoz López del Castillo

    Full Text Available El frenillo labial superior doble no sindrómico es una anomalía del desarrollo que no hemos encontrado reportada en la revisión bibliográfica realizada. Se presenta una niña de 11 años de edad que fue remitida al servicio de Cirugía Maxilofacial del Hospital "Eduardo Agramonte Piña", de Camagüey, por presentar un frenillo labial superior doble de baja inserción. Se describen los síntomas clínicos asociados a esta anomalía y el tratamiento quirúrgico utilizado para su solución: una frenectomía y plastia sobre la banda muscular frénica anormal que provocaba exceso de tejido en la mucosa labial. Consideramos muy interesante la descripción de este caso, por no haber encontrado reporte similar en la literatura revisada.

  17. Usefulness of multidetector-row CT (MDCT) for the diagnosis of non-occlusive mesenteric ischemia (NOMI): Assessment of morphology and diameter of the superior mesenteric artery (SMA) on multi-planar reconstructed (MPR) images

    Energy Technology Data Exchange (ETDEWEB)

    Woodhams, Reiko, E-mail: reikow@hotmail.co.j [Department of Radiology, Kitasato University School of Medicine, 1-15-1, Kitasato, Sagamihara, Kanagawa 228-8555 (Japan); Nishimaki, Hiroshi, E-mail: emgrad@yhb.att.ne.j [Department of Radiology, Kitasato University School of Medicine, 1-15-1, Kitasato, Sagamihara, Kanagawa 228-8555 (Japan); Emergency Medicine, Kitasato University School of Medicine, 1-15-1, Kitasato, Sagamihara, Kanagawa, 228-8555 (Japan); Fujii, Kaoru, E-mail: kaorufujii@yahoo.co.j [Department of Radiology, Kitasato University School of Medicine, 1-15-1, Kitasato, Sagamihara, Kanagawa 228-8555 (Japan); Kakita, Satoko, E-mail: skakita@kitasato-u.ac.j [Department of Radiology, Kitasato University School of Medicine, 1-15-1, Kitasato, Sagamihara, Kanagawa 228-8555 (Japan); Hayakawa, Kazushige, E-mail: hayakazu@med.kitasato-u.ac.j [Department of Radiology, Kitasato University School of Medicine, 1-15-1, Kitasato, Sagamihara, Kanagawa 228-8555 (Japan)

    2010-10-15

    Objective: The purpose of this study was to assess the efficacy of multidetector-row CT (MDCT) for the diagnosis of non-occlusive mesenteric ischemia (NOMI) by analyzing morphology and diameter of superior mesenteric artery (SMA). We assessed whether MDCT was as useful as angiography for the diagnosis of NOMI. Materials and methods: Four patients who were diagnosed with NOMI were retrospectively analyzed. All patients had 8-row MDCT followed by laparotomy. Two of them underwent angiography after MDCT. The morphology and diameter of SMA of these cases was analyzed on multi-planar reconstructed (MPR) images. The mean diameter of SMA of NOMI cases was compared to that of 13 control cases. Results: MPR images of all NOMI cases showed irregular narrowing of the SMA, spasm of the arcades of SMA, and poor demonstration of intramural vessels. MPR images of two patients who had angiography were concordant with their angiograms. The mean diameter of SMA of NOMI patients was 3.4 {+-} 1.1 mm, which was statistically smaller than that of 13 control patients, 6.0 {+-} 1.5 mm (P < 0.05, Wilcoxon rank sum tests). Conclusion: Angiography has been recognized essential for the diagnosis of NOMI. This study shows the possibility of MDCT to be an equivalently useful modality compared to angiography for the diagnosis of NOMI by interpreting morphologic appearance and diameter of SMA. Introduction of MDCT in the decision tree of NOMI treatment may bring the benefit of prompt diagnosis and subsequent early and efficient initiation of therapy, which may improve the mortality.

  18. Cardiac imaging in infectious endocarditis

    DEFF Research Database (Denmark)

    Bruun, Niels Eske; Habib, Gilbert; Thuny, Franck;

    2014-01-01

    Infectious endocarditis remains both a diagnostic and a treatment challenge. A positive outcome depends on a rapid diagnosis, accurate risk stratification, and a thorough follow-up. Imaging plays a key role in each of these steps and echocardiography remains the cornerstone of the methods in use....... The technique of both transthoracic echocardiography and transoesophageal echocardiography has been markedly improved across the last decades and most recently three-dimensional real-time echocardiography has been introduced in the management of endocarditis patients. Echocardiography depicts structural changes...... with conventional CT (SPECT/CT). Of these methods, (18)F-FDG PET-CT carries the best promise for a future role in endocarditis. But there are distinct limitations with both SPECT/CT and (18)F-FDG PET-CT which should not be neglected. MRI and spiral CT are methods primarily used in the search for extra cardial...

  19. Sobredentadura total superior implantosoportada

    Directory of Open Access Journals (Sweden)

    Luis Orlando Rodríguez García

    2010-06-01

    Full Text Available Se presenta un caso de un paciente desdentado total superior, rehabilitado en la consulta de implantología de la Clínica "Pedro Ortiz" del municipio Habana del Este en Ciudad de La Habana, Cuba, en el año 2009, mediante prótesis sobre implantes osteointegrados, técnica que se ha incorporado a la práctica estomatológica en Cuba como alternativa al tratamiento convencional en los pacientes desdentados totales. Se siguió un protocolo que comprendió una fase quirúrgica, procedimiento con o sin realización de colgajo y carga precoz o inmediata. Se presenta un paciente masculino de 56 años de edad, que acudió a la consulta multidisciplinaria, preocupado, porque se le habían elaborado tres prótesis en los últimos dos años y ninguna reunía los requisitos de retención que él necesitaba para sentirse seguro y cómodo con las mismas. El resultado final fue la satisfacción total del paciente, con el mejoramiento de la calidad estética y funcional.

  20. Updated standards and processes for accreditation of echocardiographic laboratories from The European Association of Cardiovascular Imaging.

    Science.gov (United States)

    Popescu, Bogdan A; Stefanidis, Alexandros; Nihoyannopoulos, Petros; Fox, Kevin F; Ray, Simon; Cardim, Nuno; Rigo, Fausto; Badano, Luigi P; Fraser, Alan G; Pinto, Fausto; Zamorano, Jose Luis; Habib, Gilbert; Maurer, Gerald; Lancellotti, Patrizio; Andrade, Maria Joao; Donal, Erwan; Edvardsen, Thor; Varga, Albert

    2014-07-01

    Standards for echocardiographic laboratories were proposed by the European Association of Echocardiography (now the European Association of Cardiovascular Imaging) 7 years ago in order to raise standards of practice and improve the quality of care. Criteria and requirements were published at that time for transthoracic, transoesophageal, and stress echocardiography. This paper reassesses and updates the quality standards to take account of experience and the technical developments of modern echocardiographic practice. It also discusses quality control, the incentives for laboratories to apply for accreditation, the reaccreditation criteria, and the current status and future prospects of the laboratory accreditation process.

  1. The synergistic effect between corporate image and product’s superior benefits:A stereotype content model approach%公司形象和产品属性超越的协同效应:基于刻板印象内容模型

    Institute of Scientific and Technical Information of China (English)

    江红艳; 王海忠; 何云; 朱力

    2016-01-01

    由于消费者和品牌之间的关系与人际关系存在许多相似之处,反映人际感知的刻板印象内容模型为品牌感知研究提供了全新的视角。然而,以往研究多关注品牌感知两大维度——“感知能力”和“感知温情”二者之间的作用关系,鲜有研究同时基于公司层面和产品层面考察品牌感知不同维度的前因变量及其交互作用机理。鉴于此,本文实验1考察了公司形象/产品属性超越的不同维度与“感知能力”和“感知温情”的对应关系,在此基础上进一步发现公司形象和产品属性超越对购买意愿的协同效应。具体而言,当公司形象为能力型时,产品享乐性(相对于功能性)属性超越下消费者的购买意愿更高;当公司形象为诚信型时,产品功能性(相对于享乐性)属性超越下消费者的购买意愿更高。而且,品牌赞赏感在上述协同效应中发挥中介作用。实验2探究感知风险调节公司形象和产品属性超越对购买意愿的协同影响。文章最后讨论了本文的理论贡献,对企业如何实现公司形象策略和产品属性策略的协同促进等方面的营销启示,以及未来研究方向。%Models of social perception in social psychology can help our understanding of consumers’ perception and relation with brands. Consumers’ relationships with brands sometimes resemble people’s relationships among themselves. It is thus speculated that the Stereotype Content Model (SCM) on how social perception works would possibly apply to brand perception. Few studies, however, have investigated the antecedent variables of the different dimensions of brand perception at the corporate and product levels, as well as their interaction mechanism. This research explored the possible antecedent roles of corporate image and product’s superior benefits in brand perception. We further hypothesized a synergistic effect of corporate image and

  2. Measurement of blood flow in the superior sagittal sinus in healthy volunteers, and in patients with normal pressure hydrocephalus and idiopathic intracranial hypertension with phase-contrast cine MR imaging

    DEFF Research Database (Denmark)

    Gideon, P; Thomsen, C; Gjerris, F

    1996-01-01

    PURPOSE: To measure blood flow and velocity in the superior sagittal ++sinus. MATERIAL AND METHODS: MR velocity mapping was used to examine 14 healthy volunteers, 15 patients with normal pressure hydrocephalus (NPH), 3 patients with high pressure hydrocephalus (HPH), and 11 patients with idiopathic...... intracranial hypertension (IIH). RESULTS: Mean blood flow was 443 ml/min in healthy volunteers with a tendency towards reduced blood flow with increasing age. In NPH patients significantly lower superior sagittal sinus blood flow values were found, but this difference was no longer significant when patients...... and controls were matched for age. In HPH and IIH patients blood flow and velocity were within the normal range. In one patient with thrombosis of the superior sagittal sinus the blood flow was reduced to 40 ml/min. CONCLUSION: MR velocity mapping methods may be of value in the assessment of blood flow...

  3. 75 FR 28542 - Superior Resource Advisory Committee

    Science.gov (United States)

    2010-05-21

    ... orient the new Superior Resource Advisory Committee members on their roles and responsibilities. DATES... of the roles and responsibilities of the Superior Resource Advisory Committee members; Election of... Forest Service Superior Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice...

  4. [The superior laryngeal nerve and the superior laryngeal artery].

    Science.gov (United States)

    Lang, J; Nachbaur, S; Fischer, K; Vogel, E

    1987-01-01

    Length, diameter and anastomoses of the nervus vagus and its ganglion inferius were measured 44 halved heads. On the average, 8.65 fiber bundles of the vagus nerve leave the retro-olivary area. In the area of the jugular foramen is the near superior ganglion of the 10th cranial nerve. In this area were found 1.48 (mean value) anastomoses with the 9th cranial nerve. 11.34 mm below the margo terminalis sigmoidea branches off the ramus internus of the accessory nerve which has a length of 9.75 mm. Further anastomoses with the 10th cranial nerve were found. The inferior ganglion of the 10th nerve had a length of 25.47 mm and a diameter of 3.46 mm. Five mm below the ganglion the 10th nerve had a width of 2.9 and a thickness of 1.5 mm. The mean length of the superior sympathetic ganglion was 26.6 mm, its width 7.2 and its thickness 3.4 mm. In nearly all specimens anastomoses of the superior sympathetic ganglion with the ansa cervicalis profunda and the inferior ganglion of the 10th cranial nerve were found. The superior laryngeal nerve branches off about 36 mm below the margo terminalis sigmoidea. The width of this nerve was 1.9 mm, its thickness 0.8 mm on the right and 1.0 mm on the left side. The division in the internal and external rami was found about 21 mm below its origin. Between the n. vagus and thyreohyoid membrane the ramus internus had a length of 64 mm, the length of external ramus between the vagal nerve and the inferior pharyngeal constrictor muscle was 89 mm. Its mean length below the thyreopharyngeal part was 10.7 mm, 8.6 branchlets to the cricothyroid muscle were counted. The superior laryngeal artery had its origin in 80% of cases in the superior thyroideal artery, in 6.8% this vessel was a branch of the external carotid artery. Its average outer diameter was 1.23 mm on the right side and 1.39 mm on the left. The length of this vessel between its origin and the thyreohyoid membrane was 34 mm. In 7% on the right side and in 13% on the left, the superior

  5. Images

    Data.gov (United States)

    National Aeronautics and Space Administration — Images for the website main pages and all configurations. The upload and access points for the other images are: Website Template RSW images BSCW Images HIRENASD...

  6. What are Millian Qualitative Superiorities?

    Directory of Open Access Journals (Sweden)

    Jonathan Riley

    2008-04-01

    Full Text Available In an article published in Prolegomena 2006, Christoph Schmidt-Petri has defended his interpretation and attacked mine of Mill’s idea that higher kinds of pleasure are superior in quality to lower kinds, regardless of quantity. Millian qualitative superiorities as I understand them are infinite superiorities. In this paper, I clarify my interpretation and show how Schmidt-Petri has misrepresented it and ignored the obvious textual support for it. As a result, he fails to understand how genuine Millian qualitative superiorities determine the novel structure of Mill’s pluralistic utilitarianism, in which a social code of justice that distributes equal rights and duties takes absolute priority over competing considerations. Schmidt-Petri’s own interpretation is a non-starter, because it does noteven recognize that Mill is talking about different kinds of pleasant feelings, such that the higher kinds are intrinsically more valuable than the lower. I conclude by outlining why my interpretation is free of any metaphysical commitment to the “essence” of pleasure.

  7. Isolated superior mesenteric artery dissection

    Directory of Open Access Journals (Sweden)

    Lalitha Palle

    2010-01-01

    Full Text Available Isolated superior mesenteric artery (SMA dissection without involvement of the aorta and the SMA origin is unusual. We present a case of an elderly gentleman who had chronic abdominal pain, worse after meals. CT angiography, performed on a 64-slice CT scanner, revealed SMA dissection with a thrombus. A large artery of Drummond was also seen. The patient was managed conservatively.

  8. 肝移植术后门静脉狭窄-肠系膜上静脉血栓的影像诊断%Imaging diagnosis of portal vein stricture complicated with superior mesenteric venous thrombosis after liver transplantation

    Institute of Scientific and Technical Information of China (English)

    姜英丽; 陈虹; 李朝阳; 叶道斌; 张庆; 范铁艳; 沈中阳

    2010-01-01

    @@ 肠系膜上静脉血栓(superior mesenteric venous thrombosis,SMVT)发病率较低,多与肝移植行脾切除后门静脉高压及红细胞黏度增高等有关,其临床表现无特异性,易误诊、漏诊.本研究回顾性分析2009年12月26日我所收治的肝移植术后门静脉狭窄伴SMVT患者的临床资料,总结该病的影像学诊断要点.%Portal vein stricture complicated with superior mesenteric venous thrombosis is rarely seen in clinical practice. On December 26, 2009, a 51-year-old male patient who had a liver transplantation history was admitted to The General Hospital of Chinese People's Armed Police Forces with the chief complaint of intermittent abdominal pain and diarrhea.A plain and enhanced CT scan showed that the portal vein was constrictive and thrombosis had formed in the main trunk of the superior mesenteric vein, and varicose veins were seen in surrounding tissues of the esophagus. Edema was observed at the end of the ileum and cecum. The results of colonoscopy showed inflammatory changes and varicose veins of the colon. The patient received medical treatment. The thrombosis was dissolved 9 days later, and all symptoms disappeared 12 days later.

  9. A escrita no Ensino Superior

    Directory of Open Access Journals (Sweden)

    Maria Conceição Pillon Christofoli

    2013-01-01

    Full Text Available http://dx.doi.org/10.5902/198464445865 O presente artigo trata de apresentar resultados oriundos de pesquisa realizada no Ensino Superior, enfocando a escrita em contextos universitários. Depoimentos por parte dos acadêmicos evidenciam certa resistência ao ato de escrever, o que acaba muitas vezes distanciando o sujeito da produção de um texto. Assim sendo, mesmo que parciais, os resultados até então analisados dão conta de que: pressuposto 1 – há ruptura da ideia de coerência entre o que pensamos, o que conseguimos escrever, o que entende nosso interlocutor; pressuposto 2 – a autocorreção de textos como exercício de pesquisa é imprescindível para a qualificação da escrita; pressuposto 3 – os diários de aula representam rico instrumento para a qualificação da escrita no Ensino Superior; pressuposto 4 – há necessidade de que o aluno do Ensino Superior escreva variados tipos de escrita, ainda que a universidade cumpra com seu papel, enfatizando a escrita acadêmica; pressuposto 5 – o trabalho com a escrita no Ensino Superior deve enfatizar os componentes básicos da expressão escrita: o código escrito e a composição da escrita. Palavras-chave: Escrita; Ensino Superior; formação de professores.

  10. Pensamiento Superior y Desarrollo Territorial

    Directory of Open Access Journals (Sweden)

    Víctor Manuel Racancoj Alonzo

    2015-04-01

    Full Text Available Esta reflexión pretende explicar el papel, fundamental, que juega el pensamiento superior, en la formulación y la práctica de modelos de desarrollo territorial local; para que contribuyan de forma sustantiva, en la transformación de las condiciones socioeconómicas adversas que hoy viven comunidades indígenas y rurales de muchos países, como Guatemala, situación que puede resumirse en altos índices de pobreza y desnutrición. Pero, el pensamiento superior, debe ser competencia de la población con pertenencia a lo local, pues si y solo si esta condición existe, se dará validez y viabilidad al desarrollo territorial. Para alcanzar competencias de pensamiento superior, en los espacios locales, se tiene que superar obstáculos en el modelo de universidad, que hoy estamos familiarizados a ver y pensar; modelos que tienen las características de: herencia colonial, disfunción con la problemática económica, cultural, social y política de la sociedad y la negación de los saberes ancestrales.

  11. Superior sulcus tumors (Pancoast tumors).

    Science.gov (United States)

    Marulli, Giuseppe; Battistella, Lucia; Mammana, Marco; Calabrese, Francesca; Rea, Federico

    2016-06-01

    Superior Sulcus Tumors, frequently termed as Pancoast tumors, are a wide range of tumors invading the apical chest wall. Due to its localization in the apex of the lung, with the potential invasion of the lower part of the brachial plexus, first ribs, vertebrae, subclavian vessels or stellate ganglion, the superior sulcus tumors cause characteristic symptoms, like arm or shoulder pain or Horner's syndrome. The management of superior sulcus tumors has dramatically evolved over the past 50 years. Originally deemed universally fatal, in 1956, Shaw and Paulson introduced a new treatment paradigm with combined radiotherapy and surgery ensuring 5-year survival of approximately 30%. During the 1990s, following the need to improve systemic as well as local control, a trimodality approach including induction concurrent chemoradiotherapy followed by surgical resection was introduced, reaching 5-year survival rates up to 44% and becoming the standard of care. Many efforts have been persecuted, also, to obtain higher complete resection rates using appropriate surgical approaches and involving multidisciplinary team including spine surgeon or vascular surgeon. Other potential treatment options are under consideration like prophylactic cranial irradiation or the addition of other chemotherapy agents or biologic agents to the trimodality approach.

  12. MRI manifestations of enlarged superior ophthalmic vein

    Institute of Scientific and Technical Information of China (English)

    WEI Rui-li; MA Xiao-ye; CAI Ji-ping; ZHU Huang

    2002-01-01

    Objective:To assess MRI in the evaluation of enlarged superior ophthalmic vein (SOV). Methods: MRI manifestations and etiology of forty-six patients with enlarged SOV were analyzed. Results: SOV enlargement was noted to occur in carotid-cavernous fistula, ophthalmic Graves'disease, Tolosa-Hunt syndrome, inflammation at the apex of the orbit, orbital pseudotumor and thrombosis of cavernous sinus. The dilated vein appeared as signal void tubular shadows on both T1 and T2 weighted images. The diameter of the enlarged vein was 3.5-6.0 mm. Extraocular muscle enlargement, orbital pathologies, enlarged carotid cavernous sinus etc were also revealed by MRI. Conclusion: The dilated SOV may be well demonstrated by MRI. The etiological diagnosis of enlarged SOV can be made in combination with the associated findings.

  13. The management of superior sulcus tumors

    Energy Technology Data Exchange (ETDEWEB)

    Komaki, Ritsuko; Cox, J.D.; Putnam, J.B. Jr [Texas Univ., Houston, TX (United States). Anderson Cancer Center] (and others)

    2001-09-01

    Superior sulcus tumors are a rare type of lung cancer arising in the apex of the lung above the sulcus and cause specific symptoms and signs depending on the location and whether the tumor extends into the surrounding structures. Because of the closeness of critical structures to the tumor (e.g., the subclavian artery for anterior lesions, the brachial plexus for lesions in the middle location, and the sympathetic stellate ganglion causing Horner's syndrome [Pancoast's tumor], the vertebral bodies, nerve foramen, and spinal cord for posterior lesions), superior sulcus tumors were often considered marginally respectable or unresectable. Therefore, for many years, preoperative radiation therapy was considered routine treatment for those tumors. However, with the evolution in our understanding of these tumors and modern imaging techniques such as computerized tomography (CT) and magnetic resonant imaging (MRI) and surgical techniques, there is now considerable debate about the roles and timing of surgical resection, radiation therapy, and chemotherapy in the treatment of patients with these tumors. If mediastinoscopy reveals microscopic mediastinal lymph node involvement, the patient can be treated with preoperative concurrent chemoradiotherapy followed by surgery. If there was a gross mediastinal lymph node involvement (N2) on CT, N3 or T4 lesions, the patient can be treated with concurrent chemoradiotherapy with a curative intent; the outcome of such treatment appears to be better than that of sequential chemotherapy followed by radiation therapy. Whenever possible, without compromising the patient's quality of life, surgery should be considered to improve outcome. (author)

  14. Superior Canal Dehiscence Syndrome: Lessons from the First 20 Years

    Directory of Open Access Journals (Sweden)

    Bryan K. Ward

    2017-04-01

    Full Text Available Superior semicircular canal dehiscence syndrome was first reported by Lloyd Minor and colleagues in 1998. Patients with a dehiscence in the bone overlying the superior semicircular canal experience symptoms of pressure or sound-induced vertigo, bone conduction hyperacusis, and pulsatile tinnitus. The initial series of patients were diagnosed based on common symptoms, a physical examination finding of eye movements in the plane of the superior semicircular canal when ear canal pressure or loud tones were applied to the ear, and high-resolution computed tomography imaging demonstrating a dehiscence in the bone over the superior semicircular canal. Research productivity directed at understanding better methods for diagnosing and treating this condition has substantially increased over the last two decades. We now have a sound understanding of the pathophysiology of third mobile window syndromes, higher resolution imaging protocols, and several sensitive and specific diagnostic tests. Furthermore, we have a treatment (surgical occlusion of the superior semicircular canal that has demonstrated efficacy. This review will highlight some of the fundamental insights gained in SCDS, propose diagnostic criteria, and discuss future research directions.

  15. Superior memorizers employ different neural networks for encoding and recall.

    Science.gov (United States)

    Mallow, Johannes; Bernarding, Johannes; Luchtmann, Michael; Bethmann, Anja; Brechmann, André

    2015-01-01

    Superior memorizers often employ the method of loci (MoL) to memorize large amounts of information. The MoL, known since ancient times, relies on a complex process where information to be memorized is bound to landmarks along mental routes in a previously memorized environment. However, functional magnetic resonance imaging data on groups of trained superior memorizer are rare. Based on the memorizing strategy reported by superior memorizers, we developed a scheme of the processes successively employed during memorizing and recalling digits and relate these to brain activation that is specific for the encoding and recall period. In the examined superior memorizers several regions, suggested to be involved in mental navigation and digit-to-word processing, were specifically activated during encoding: bilateral early visual cortex, retrosplenial cortex, left parahippocampus, left visual cortex, and left superior parietal cortex. Although the scheme suggests that some steps during encoding and recall seem to be analog, none of the encoding areas were specifically activated during the recall. Instead, we found strong activation in left anterior superior temporal gyrus, which we relate to recalling the sequential order of the digits, and right motor cortex that may be related to reciting the digits.

  16. Entidades fiscalizadoras superiores y accountability

    OpenAIRE

    Estela Moreno, María

    2016-01-01

    OBJETIVOS DE LA TESIS: El objetivo general del trabajo es establecer el nivel de eficacia de las Entidades Fiscalizadoras Superiores (EFS) como agencia asignada y herramienta de accountability horizontal, a través de la valoración de su diseño institucional y de la calidad de sus productos finales, los informes de auditoría, estableciéndose los siguientes objetivos específicos: 1. Relevar las nociones de accountability, actualizando el Estado del Arte de la cuestión. 2. Analizar la ...

  17. The sentence superiority effect revisited.

    Science.gov (United States)

    Snell, Joshua; Grainger, Jonathan

    2017-11-01

    A sentence superiority effect was investigated using post-cued word-in-sequence identification with the rapid parallel visual presentation (RPVP) of four horizontally aligned words. The four words were presented for 200ms followed by a post-mask and cue for partial report. They could form a grammatically correct sentence or were formed of the same words in a scrambled agrammatical sequence. Word identification was higher in the syntactically correct sequences, and crucially, this sentence superiority effect did not vary as a function of the target's position in the sequence. Cloze probability measures for words at the final, arguably most predictable position, revealed overall low values that did not interact with the effects of sentence context, suggesting that these effects were not driven by word predictability. The results point to a level of parallel processing across multiple words that enables rapid extraction of their syntactic categories. These generate a sentence-level representation that constrains the recognition process for individual words, thus facilitating parallel word processing when the sequence is grammatically sound. Copyright © 2017 Elsevier B.V. All rights reserved.

  18. Superior mediastinal widening from traumatic posterior dislocation of sternoclavicular joint: a case report

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Sung Ah; Juhng, Seon Kwan [Wonkang Univ. School of Medicine, Iksan (Korea, Republic of)

    1999-08-01

    Superior mediastinal widening, as seen on chest radiographs of traumatized patients, has been considered the hallmark of mediastinal injury. The usual causes of superior mediastinal widening are rupture of the aorta, esophagus or trachea, and hematoma as a result of spinal fracture. Posterior dislocation of the sternoclavicular joint is rarely a cause. We report a case of superior mediastinal widening resulting from traumatic posterior dislocation of the sternoclavicular joint, and describe the CT findings, including those of 3-D imaging.

  19. 78 FR 21116 - Superior Supplier Incentive Program

    Science.gov (United States)

    2013-04-09

    ... Department of the Navy Superior Supplier Incentive Program AGENCY: Department of the Navy, DoD. ACTION... policy that will establish a Superior Supplier Incentive Program (SSIP). Under the SSIP, contractors that..., performance, quality, and business relations would be granted Superior Supplier Status (SSS). Contractors...

  20. Temporal Bone Fracture Causing Superior Semicircular Canal Dehiscence

    Directory of Open Access Journals (Sweden)

    Kevin A. Peng

    2014-01-01

    Full Text Available Importance. Superior semicircular canal dehiscence (SCD is a third window lesion of the inner ear causing symptoms of vertigo, autophony, tinnitus, and hearing loss. A “two-hit” hypothesis has traditionally been proposed, whereby thinly developed bone overlying the superior canal is disrupted by a sudden change in intracranial pressure. Although the symptoms of SCD may be precipitated by head injury, no previous reports have described a temporal bone fracture directly causing SCD. Observations. Two patients sustained temporal bone fractures after closed head trauma, and developed unilateral otologic symptoms consistent with SCD. In each instance, computed tomography imaging revealed fractures extending through the bony roof of the superior semicircular canal. Conclusions and Relevance. Temporal bone fractures, which are largely treated nonoperatively, have not previously been reported to cause SCD. As it is a potentially treatable entity, SCD resulting from temporal bone fracture must be recognized as a possibility and diagnosed promptly if present.

  1. Isolated abscess in superior rectus muscle in a child

    Directory of Open Access Journals (Sweden)

    Sushank Ashok Bhalerao

    2015-01-01

    Full Text Available Pyomyositis is a primary bacterial infection of striated muscles nearly always caused by Staphylococcus aureus. Development of the intramuscular abscess involving the extra-ocular muscles (EOMs remains an extremely rare process. We herein present a case of isolated EOM pyomyositis involving superior rectus muscle in a 2-year male child who was referred with complaints of swelling in left eye (LE and inability to open LE since last 1-month. Orbital computed tomography (CT scan showed a well-defined, hypo-dense, peripheral rim-enhancing lesion in relation to left superior rectus muscle suggestive of left superior rectus abscess. The abscess was drained through skin approach. We concluded that pyomyositis of EOM should be considered in any patient presenting with acute onset of orbital inflammation and characteristic CT or magnetic resonance imaging features. Management consists of incision and drainage coupled with antibiotic therapy.

  2. superior en México

    Directory of Open Access Journals (Sweden)

    César Mureddu Torres

    2008-01-01

    Full Text Available El presente artículo desarrolla algunos de los retos que ha traído consigo el acceso a la información existente en la red de Internet y lo que ello supone. Se abordan principalmente las consecuencias de la presencia actual de una sociedad llamada del conocimiento, si se mantiene la confusión entre conocimiento e información. Por ello, la sola gestión de la información no puede ser tomada como definitoria respecto a la función de educación superior confiada a las universidades. Hacerlo sería cometer un error aún más grave que la confusión teórica entre los términos mencionados.

  3. Superior calcium homeostasis of extraocular muscles.

    Science.gov (United States)

    Zeiger, Ulrike; Mitchell, Claire H; Khurana, Tejvir S

    2010-11-01

    Extraocular muscles (EOMs) are a unique group of skeletal muscles with unusual physiological properties such as being able to undergo rapid twitch contractions over extended periods and escape damage in the presence of excess intracellular calcium (Ca(2+)) in Duchenne's muscular dystrophy (DMD). Enhanced Ca(2+) buffering has been proposed as a contributory mechanism to explain these properties; however, the mechanisms are not well understood. We investigated mechanisms modulating Ca(2+) levels in EOM and tibialis anterior (TA) limb muscles. Using Fura-2 based ratiometric Ca(2+) imaging of primary myotubes we found that EOM myotubes reduced elevated Ca(2+) ˜2-fold faster than TA myotubes, demonstrating more efficient Ca(2+) buffering. Quantitative PCR (qPCR) and western blotting revealed higher expression of key components of the Ca(2+) regulation system in EOM, such as the cardiac/slow isoforms sarcoplasmic Ca(2+)-ATPase 2 (Serca2) and calsequestrin 2 (Casq2). Interestingly EOM expressed monomeric rather than multimeric forms of phospholamban (Pln), which was phosphorylated at threonine 17 (Thr17) but not at the serine 16 (Ser16) residue. EOM Pln remained monomeric and unphosphorylated at Ser16 despite protein kinase A (PKA) treatment, suggesting differential signalling and modulation cascades involving Pln-mediated Ca(2+) regulation in EOM. Increased expression of Ca(2+)/SR mRNA, proteins, differential post-translational modification of Pln and superior Ca(2+) buffering is consistent with the improved ability of EOM to handle elevated intracellular Ca(2+) levels. These characteristics provide mechanistic insight for the potential role of superior Ca(2+) buffering in the unusual physiology of EOM and their sparing in DMD.

  4. Escuela Superior de Palos Verdes

    Directory of Open Access Journals (Sweden)

    Neutra, Richard J.

    1965-02-01

    Full Text Available Before initiating the building operations for the «Palos Verdes» School, the site was divided into two large horizontal surfaces, at different levels. The lower one served to accommodate the playing fields, a car park, the physical training building, and shop and ancillary buildings. On the higher of these two surfaces, and to the West of the access road, there is a car park and also the building and plot of ground devoted to agricultural technology, as well as the literary studies and general purpose buildings. As a complement to these, there is a series of blocks, arranged in parallel rows, which house the administrative offices, the art school, the craft's school, the general classrooms, and those devoted to higher education. The fascinating aspect of this school is the outstanding penetration of the architect's mind into the essential function of the project. Its most evident merit is the sense of comradeship and harmony that permeates the whole architectural manifold.Antes de construir el complejo escolar «Palos Verdes» se comenzó por crear, en el terreno, dos grandes mesetas a niveles diferentes. Sobre el inferior se organizaron: los campos de juegos, de deportes, un aparcamiento, el edificio para educación física y los destinados a tiendas y servicios. Sobre la meseta superior, al oeste de la vía de acceso, se dispuso un aparcamiento y el edificio y campo para adiestramiento agrícola; al este, otro aparcamiento, el edificio dedicado a materias literarias, y el destinado a usos múltiples. Completan las instalaciones de la escuela una serie de bloques paralelos: la administración, la escuela de arte, las clases de trabajos manuales, las aulas de enseñanzas generales, y las de los cursos superiores. Lo fascinante de este complejo escolar es la perfecta y magistral compenetración del arquitecto con el tema proyectado, y su mayor mérito, la sensación de cordialidad y armonía con el ambiente.

  5. Imaging in percutaneous ablation for atrial fibrillation

    Energy Technology Data Exchange (ETDEWEB)

    Maksimovic, Ruzica [Erasmus Medical Center, Department of Radiology, GD Rotterdam (Netherlands); Institute for Cardiovascular Diseases of the University Medical Center, Belgrade (Czechoslovakia); Dill, Thorsten [Kerckhoff-Heart Center, Department of Cardiology, Bad Nauheim (Germany); Ristic, Arsen D.; Seferovic, Petar M. [Institute for Cardiovascular Diseases of the University Medical Center, Belgrade (Czechoslovakia)

    2006-11-15

    Percutaneous ablation for electrical disconnection of the arrhythmogenic foci using various forms of energy has become a well-established technique for treating atrial fibrillation (AF). Success rate in preventing recurrence of AF episodes is high although associated with a significant incidence of pulmonary vein (PV) stenosis and other rare complications. Clinical workup of AF patients includes imaging before and after ablative treatment using different noninvasive and invasive techniques such as conventional angiography, transoesophageal and intracardiac echocardiography, computed tomography (CT) and magnetic resonance imaging (MRI), which offer different information with variable diagnostic accuracy. Evaluation before percutaneous ablation involves assessment of PVs (PV pattern, branching pattern, orientation and ostial size) to facilitate position and size of catheters and reduce procedure time as well as examining the left atrium (presence of thrombi, dimensions and volumes). Imaging after the percutaneous ablation is important for assessment of overall success of the procedure and revealing potential complications. Therefore, imaging methods enable depiction of PVs and the anatomy of surrounding structures essential for preprocedural management and early detection of PV stenosis and other ablation-related procedures, as well as long-term follow-up of these patients. (orig.)

  6. Superior vesical fissure concealed by giant omphalocele: A case report

    Directory of Open Access Journals (Sweden)

    Danial Hayek

    2016-11-01

    Full Text Available Omphalocele is an abdominal wall defect characterized by exteriorization of abdominal viscera that is covered by a membrane. Omphalocele has a well-known association with chromosome abnormalities. Here we present a case of a superior vesical fissure (SVF initially disguised as a giant omphalocele in a newborn with trisomy 18. We also show unique prenatal imaging and discuss the importance and limitations of prenatal genetic testing.

  7. Sobredentadura total superior implantosoportada Superior total overdenture on implants

    Directory of Open Access Journals (Sweden)

    Luis Orlando Rodríguez García

    2010-06-01

    Full Text Available Se presenta un caso de un paciente desdentado total superior, rehabilitado en la consulta de implantología de la Clínica "Pedro Ortiz" del municipio Habana del Este en Ciudad de La Habana, Cuba, en el año 2009, mediante prótesis sobre implantes osteointegrados, técnica que se ha incorporado a la práctica estomatológica en Cuba como alternativa al tratamiento convencional en los pacientes desdentados totales. Se siguió un protocolo que comprendió una fase quirúrgica, procedimiento con o sin realización de colgajo y carga precoz o inmediata. Se presenta un paciente masculino de 56 años de edad, que acudió a la consulta multidisciplinaria, preocupado, porque se le habían elaborado tres prótesis en los últimos dos años y ninguna reunía los requisitos de retención que él necesitaba para sentirse seguro y cómodo con las mismas. El resultado final fue la satisfacción total del paciente, con el mejoramiento de la calidad estética y funcional.This is the case of a total maxilla edentulous patient seen in consultation of the "Pedro Ortíz" Clinic Implant of Habana del Este municipality in 2009 and con rehabilitation by prosthesis over osteointegration implants added to stomatology practice in Cuba as an alternative to conventional treatment in patients totally edentulous. We follow a protocol including a surgery or surgical phase, technique without or with flap creation and early or immediate load. This is a male patient aged 56 came to our multidisciplinary consultation worried because he had three prostheses in last two years and any fulfilled the requirements of retention to feel safe and comfortable with prostheses. The final result was the total satisfaction of rehabilitated patient improving its aesthetic and functional quality.

  8. Widespread Myocardial Delivery of Heart-Derived Stem Cells by Nonocclusive Triple-Vessel Intracoronary Infusion in Porcine Ischemic Cardiomyopathy: Superior Attenuation of Adverse Remodeling Documented by Magnetic Resonance Imaging and Histology.

    Directory of Open Access Journals (Sweden)

    Eleni Tseliou

    Full Text Available Single-vessel, intracoronary infusion of stem cells under stop-flow conditions has proven safe but achieves only limited myocardial coverage. Continuous flow intracoronary delivery to one or more coronary vessels may achieve broader coverage for treating cardiomyopathy, but has not been investigated. Using nonocclusive coronary guiding catheters, we infused allogeneic cardiosphere-derived cells (CDCs either in a single vessel or sequentially in all three coronary arteries in porcine ischemic cardiomyopathy and used magnetic resonance imaging (MRI to assess structural and physiological outcomes. Vehicle-infused animals served as controls. Single-vessel stop-flow and continuous-flow intracoronary infusion revealed equivalent effects on scar size and function. Sequential infusion into each of the three major coronary vessels under stop-flow or continuous-flow conditions revealed equal efficacy, but less elevation of necrotic biomarkers with continuous-flow delivery. In addition, multi-vessel delivery resulted in enhanced global and regional tissue function compared to a triple-vessel placebo-treated group. The functional benefits after global cell infusion were accompanied histologically by minimal inflammatory cellular infiltration, attenuated regional fibrosis and enhanced vessel density in the heart. Sequential multi-vessel non-occlusive delivery of CDCs is safe and provides enhanced preservation of left ventricular function and structure. The current findings provide preclinical validation of the delivery method currently undergoing clinical testing in the Dilated cardiomYopathy iNtervention With Allogeneic MyocardIally-regenerative Cells (DYNAMIC trial of CDCs in heart failure patients.

  9. Agenesia de cava superior associada a bloqueio atrioventricular de 3º grau Agenesis of the right superior vena cava associated with total heart block

    Directory of Open Access Journals (Sweden)

    Gustavo J. Ventura Couto

    2008-03-01

    Full Text Available A persistência de veia cava superior esquerda com ausência da veia cava superior é uma anomalia rara, principalmente quando associada a bloqueio atrioventricular de 3º grau. Relatamos o caso de uma paciente, na qual durante implante de marca-passo definitivo, para a correção de bloqueio atrioventricular total, foi detectada presença de veia cava superior esquerda com suspeição de ausência de veia cava superior, o que levou ao emprego de técnica diferenciada para fixação do eletrodo ventricular. Para confirmação da provável agenesia, foram realizados diversos exames complementares de imagem, demonstrando-se a dificuldade no diagnóstico da síndrome aqui descrita.The superior left vena cava with the absent superior vena cava is a rare abnormality, especially when associated with total heart block. We report a case of a patient in which the presence of superior left vena cava and the absence of the superior vena cava was detected during the implantation of a pacemaker for the correction of a total heart block, which led us to use a different technique for the fixation of the ventricular electrode. To confirm the supposed absence, several image exams were made showing the difficulty on the diagnosis of the described syndrome.

  10. Morphological variation of siscowet lake trout in Lake Superior

    Science.gov (United States)

    Bronte, C.R.; Moore, S.A.

    2007-01-01

    Historically, Lake Superior has contained many morphologically distinct forms of the lake trout Salvelinus namaycush that have occupied specific depths and locations and spawned at specific times of the year. Today, as was probably the case historically, the siscowet morphotype is the most abundant. Recent interest in harvesting siscowets to extract oil containing omega-3 fatty acids will require additional knowledge of the biology and stock structure of these lightly exploited populations. The objective of this study was to determine whether shape differences exist among siscowet populations across Lake Superior and whether these shape differences can be used to infer stock structure. Morphometric analysis (truss protocol) was used to differentiate among siscowets sampled from 23 locations in Lake Superior. We analyzed 31 distance measurements among 14 anatomical landmarks taken from digital images of fish recorded in the field. Cluster analysis of size-corrected data separated fish into three geographic groups: The Isle Royale, eastern (Michigan), and western regions (Michigan). Finer scales of stock structure were also suggested. Discriminant function analysis demonstrated that head measurements contributed to most of the observed variation. Cross-validation classification rates indicated that 67–71% of individual fish were correctly classified to their region of capture. This is the first study to present shape differences associated with location within a lake trout morphotype in Lake Superior.

  11. Paso superior en una ladera

    Directory of Open Access Journals (Sweden)

    Bender, O.

    1965-07-01

    Full Text Available The Redwood highway, through the Californian forest, runs on a viaduct, as it crosses a mountain slope of about 45° inclination. The firm ground is fairly deep, and as an additional constructional difficulty, it was necessary to respect the natural beauty of the countryside. A structure of portal frames were built, forming a number of short spans. These spans were bridged with metal girders, on which a 19 m wide deck was placed. The columns are hollow and have a transversal cross beam, to join each pair. There was difficulty in excavating the foundations for the columns, as it was necessary to dig through the soft top soil, and also prevent this soil from hurting the trunks of the forest trees. Another significant difficulty in the construction of this viaduct was the access to the working site, since there were no suitable platforms from which to operate the appropriate machinery. This made it necessary to do a lot of the work by manual operation. As one of the edges of the deck is very close to the mountain side, a supporting beam was erected on this side. It was made of concrete, on metal piles. The formwork for the deck structure was placed on the concrete stems of the supporting piles.La autopista denominada Redwood (California salva, con un paso superior, la ladera de un bosque cuya pendiente es del 1/1. El terreno firme se halla a bastante profundidad, añadiéndose, a los naturales problemas de la construcción, el imperativo de respetar la belleza agreste del paraje. La solución adoptada consiste en una estructura porticada, con varios tramos de pequeñas luces, salvados con vigas metálicas, sobre los que se coloca la losa del tablero, de 19 m de anchura total. Los soportes están constituidos por pórticos de dos montantes huecos (con bases de hormigón en masa por debajo del suelo, hasta el firme coronados por un cabezal. La perforación de pozos para el hormigonado de los montantes presentaba la dificultad de atravesar el terreno

  12. Pseudodisplacements of superior vena cava catheter in the persistent left superior vena cava

    Energy Technology Data Exchange (ETDEWEB)

    Jantsch, H.; Draxler, V.; Muhar, U.; Schlemmer, M.; Waneck, R.

    1983-01-01

    Pseudodisplacement of a left sided superior vena cava catheter in a persistent superior vena cava may be expected in adults in 0,37% and in a group of children with congenital heart disease in 2,5%. Embryology, anatomy and clinical implications is discussed on the basis of our own cases. The vena cava superior sinistra persitents is depending on a sufficient calibre a suitable vessel for a superior cava catheter.

  13. [Imaging].

    Science.gov (United States)

    Chevrot, A; Drapé, J L; Godefroy, D; Dupont, A M; Pessis, E; Sarazin, L; Minoui, A

    1997-01-01

    The panoply of imaging techniques useful in podology is essentially limited to X-rays. Standard "standing" and "lying" X-rays furnish most of the required information. Arthrography is sometimes performed, in particular for trauma or tumour of the ankle. CT scan and MRI make a decisive contribution in difficult cases, notably in fractures and in small fractures without displacement. The two latter techniques are useful in tendon, ligament and muscular disorders, where echography is also informative. Rigorous analysis of radiographies and a good knowledge of foot disorders make these imaging techniques efficacious.

  14. Superiority in value and the repugnant conclusion

    DEFF Research Database (Denmark)

    Jensen, Karsten Klint

    2007-01-01

    James Griffin has considered a weak form of superiority in value a possible remedy to the Repugnant Conclusion. In this paper, I demonstrate that, in a context where value is additive, this weaker form collapses into a stronger form of superiority. And in a context where value is non-additive, weak...... superiority does not amount to a radical value difference at all. I then spell out the consequences of these results for different interpretations of Griffin's suggestion regarding population ethics. None of them comes out very successful, but perhaps they nevertheless retain some interest....

  15. Visual search for emotional expressions: Effect of stimulus set on anger and happiness superiority.

    Science.gov (United States)

    Savage, Ruth A; Becker, Stefanie I; Lipp, Ottmar V

    2016-01-01

    Prior reports of preferential detection of emotional expressions in visual search have yielded inconsistent results, even for face stimuli that avoid obvious expression-related perceptual confounds. The current study investigated inconsistent reports of anger and happiness superiority effects using face stimuli drawn from the same database. Experiment 1 excluded procedural differences as a potential factor, replicating a happiness superiority effect in a procedure that previously yielded an anger superiority effect. Experiments 2a and 2b confirmed that image colour or poser gender did not account for prior inconsistent findings. Experiments 3a and 3b identified stimulus set as the critical variable, revealing happiness or anger superiority effects for two partially overlapping sets of face stimuli. The current results highlight the critical role of stimulus selection for the observation of happiness or anger superiority effects in visual search even for face stimuli that avoid obvious expression related perceptual confounds and are drawn from a single database.

  16. Millian superiorities and the repugnant conclusion

    DEFF Research Database (Denmark)

    Jensen, Karsten Klint

    2008-01-01

    James Griffin has considered a form of superiority in value that is weaker than lexical priority as a possible remedy to the Repugnant Conclusion. In this article, I demonstrate that, in a context where value is additive, this weaker form collapses into the stronger form of superiority. And in a ......James Griffin has considered a form of superiority in value that is weaker than lexical priority as a possible remedy to the Repugnant Conclusion. In this article, I demonstrate that, in a context where value is additive, this weaker form collapses into the stronger form of superiority...... of these results for different interpretations of Griffin's suggestion regarding population ethics. None of them comes out very successful, but perhaps they nevertheless retain some interest....

  17. Measuring Financial Gains from Genetically Superior Trees

    Science.gov (United States)

    George Dutrow; Clark Row

    1976-01-01

    Planting genetically superior loblolly pines will probably yield high profits.Forest economists have made computer simulations that predict financial gains expected from a tree improvement program under actual field conditions.

  18. Superior mesenteric artery syndrome causing growth retardation

    Directory of Open Access Journals (Sweden)

    Halil İbrahim Taşcı

    2013-03-01

    Full Text Available Superior mesenteric artery syndrome is a rare and lifethreateningclinical condition caused by the compressionof the third portion of the duodenum between the aortaand the superior mesenteric artery’s proximal part. Thiscompression may lead to chronic intermittent, acute totalor partial obstruction. Sudden weight-loss and the relateddecrease in the fat tissue are considered to be the etiologicalreason of acute stenosis. Weight-loss accompaniedby nausea, vomiting, anorexia, epigastric pain, andbloating are the leading complaints. Barium radiographs,computerized tomography, conventional angiography,tomographic and magnetic resonance angiography areused in the diagnosis. There are medical and surgical approachesto treatment. We hereby present the case ofa patient with superior mesenteric artery syndrome withdelayed diagnosis.Key words: superior mesenteric artery syndrome, nausea-vomiting, anorexia

  19. Leiomyosarcoma of the superior vena cava.

    Science.gov (United States)

    de Chaumont, Arthus; Pierret, Charles; de Kerangal, Xavier; Le Moulec, Sylvestre; Laborde, François

    2014-08-01

    Leiomyosarcoma of the superior vena cava is a very rare tumor and only a few cases have been reported, with various techniques of vascular reconstruction. We describe a new case of leiomyosarcoma of the superior vena cava in a 61-year-old woman with extension to the brachiocephalic arterial trunk. Resection and vascular reconstruction were performed using, respectively, polytetrafluoroethylene and polyethylene terephtalate vascular grafts.

  20. Superior mesenteric artery compression syndrome - case report

    OpenAIRE

    Paulo Rocha França Neto; Rodrigo de Almeida Paiva; Antônio Lacerda Filho; Fábio Lopes de Queiroz; Teon Noronha

    2011-01-01

    Superior mesenteric artery syndrome is an entity generally caused by the loss of the intervening mesenteric fat pad, resulting in compression of the third portion of the duodenum by the superior mesenteric artery. This article reports the case of a patient with irremovable metastatic adenocarcinoma in the sigmoid colon, that evolved with intense vomiting. Intestinal transit was carried out, which showed important gastric dilation extended until the third portion of the duodenum, compatible wi...

  1. Medical image of the week: duplicate superior vena cava

    Directory of Open Access Journals (Sweden)

    L'Heureux D

    2013-04-01

    Full Text Available A persistent left SVC is the most common thoracic venous anomaly and usually opens into the right atrium via the coronary sinus. A central line inserted into the left SVC may be mistaken for placement in other sites such as the subclavian or carotid artery, the mediastinum, the pericardium or pleural space. A duplicate SVC may cause difficulty in introducing central venous catheters or pulmonary artery catheters because of the narrow opening of the coronary sinus to reach the right atrium. In addition, a duplicate SVC is associated with important cardiac conditions such as atrial septal defects and ventricular arrhythmias.

  2. Concomitant Persistent Left Superior Vena Cava and Horseshoe Kidney

    Directory of Open Access Journals (Sweden)

    Faraz Jaffer

    2015-01-01

    Full Text Available Persistent left superior vena cava (PLSVC and horseshoe kidney (HSK are common congenital abnormalities; however presence of both in the same person is extremely rare. A patient with hepatitis C cirrhosis awaiting transplant presented with worsening liver dysfunction, diagnosed with acute renal failure secondary to hepatorenal syndrome, and required X-ray fluoroscopy guided tunneled venous catheter placement for hemodialysis. Review of imaging studies demonstrated coexistence of PLSVC and HSK. PLSVC in adulthood is usually incidental with the most common drainage pattern being without physiologic dysfunction. Isolated horseshoe kidney is still the most common of renal fusion anomalies; however etiology of coexistent PLSVC remains unknown.

  3. Superior oblique surgery: when and how?

    Directory of Open Access Journals (Sweden)

    Taylan Şekeroğlu H

    2013-08-01

    Full Text Available Hande Taylan Şekeroğlu,1 Ali Sefik Sanac,1 Umut Arslan,2 Emin Cumhur Sener11Department of Ophthalmology, 2Department of Biostatistics, Hacettepe University Faculty of Medicine, Ankara, TurkeyBackground: The purpose of this paper is to review different types of superior oblique muscle surgeries, to describe the main areas in clinical practice where superior oblique surgery is required or preferred, and to discuss the preferred types of superior oblique surgery with respect to their clinical outcomes.Methods: A consecutive nonrandomized retrospective series of patients who had undergone superior oblique muscle surgery as a single procedure were enrolled in the study. The diagnosis, clinical features, preoperative and postoperative vertical deviations in primary position, type of surgery, complications, and clinical outcomes were reviewed. The primary outcome measures were the type of strabismus and the type of superior oblique muscle surgery. The secondary outcome measure was the results of the surgeries.Results: The review identified 40 (20 male, 20 female patients with a median age of 6 (2–45 years. Nineteen patients (47.5% had Brown syndrome, eleven (27.5% had fourth nerve palsy, and ten (25.0% had horizontal deviations with A pattern. The most commonly performed surgery was superior oblique tenotomy in 29 (72.5% patients followed by superior oblique tuck in eleven (27.5% patients. The amount of vertical deviation in the fourth nerve palsy and Brown syndrome groups (P = 0.01 for both and the amount of A pattern in the A pattern group were significantly reduced postoperatively (P = 0.02.Conclusion: Surgery for the superior oblique muscle requires experience and appropriate preoperative evaluation in view of its challenging nature. The main indications are Brown syndrome, fourth nerve palsy, and A pattern deviations. Superior oblique surgery may be effective in terms of pattern collapse and correction of vertical deviations in primary

  4. Whisker-related afferents in superior colliculus.

    Science.gov (United States)

    Castro-Alamancos, Manuel A; Favero, Morgana

    2016-05-01

    Rodents use their whiskers to explore the environment, and the superior colliculus is part of the neural circuits that process this sensorimotor information. Cells in the intermediate layers of the superior colliculus integrate trigeminotectal afferents from trigeminal complex and corticotectal afferents from barrel cortex. Using histological methods in mice, we found that trigeminotectal and corticotectal synapses overlap somewhat as they innervate the lower and upper portions of the intermediate granular layer, respectively. Using electrophysiological recordings and optogenetics in anesthetized mice in vivo, we showed that, similar to rats, whisker deflections produce two successive responses that are driven by trigeminotectal and corticotectal afferents. We then employed in vivo and slice experiments to characterize the response properties of these afferents. In vivo, corticotectal responses triggered by electrical stimulation of the barrel cortex evoke activity in the superior colliculus that increases with stimulus intensity and depresses with increasing frequency. In slices from adult mice, optogenetic activation of channelrhodopsin-expressing trigeminotectal and corticotectal fibers revealed that cells in the intermediate layers receive more efficacious trigeminotectal, than corticotectal, synaptic inputs. Moreover, the efficacy of trigeminotectal inputs depresses more strongly with increasing frequency than that of corticotectal inputs. The intermediate layers of superior colliculus appear to be tuned to process strong but infrequent trigeminal inputs and weak but more persistent cortical inputs, which explains features of sensory responsiveness, such as the robust rapid sensory adaptation of whisker responses in the superior colliculus. Copyright © 2016 the American Physiological Society.

  5. Superior-subordinate relations as organizational processes

    DEFF Research Database (Denmark)

    Asmuss, Birte; Aggerholm, Helle Kryger; Oshima, Sae

    Since the emergence of the practice turn in social sciences (Golsorkhi et al. 2010), studies have shown a number of institutionally relevant aspects as achievements across time and by means of various resources (human and non-human) (Taylor & van Every 2000, Cooren et al. 2006). Such a process view...... on organizational practices relates closely to an increased focus on communication as being constitutive of the organization in general and the superior-subordinate relationship in specific. The current study aims to contribute to this line of research by investigating micro-practices involved in establishing...... superior-subordinate relations in a specific institutionalized setting: performance appraisal interviews (PAIs). While one main task of PAIs is to manage and integrate organizational and employee performance (Fletcher, 2001:473), PAIs are also organizational practices where superior-subordinate relations...

  6. Lake Superior Aquatic Invasive Species Complete Prevention Plan

    Science.gov (United States)

    The Lake Superior Aquatic Invasive Species Complete Prevention Plan is an expression of the best professional judgment of the members of the Lake Superior Task Force as to what is necessary to protect Lake Superior from new aquatic invasive species.

  7. Endovascular treatment of superior vena cava syndrome

    DEFF Research Database (Denmark)

    Duvnjak, Stevo; Andersen, Poul Erik

    2011-01-01

    Abstract AIM: The aim of this study was to report our experience with palliative stent treatment of superior vena cava syndrome. METHODS: Between January 2008 and December 2009, 30 patients (mean age 60.7 years) were treated with stents because of stenosed superior vena cava. All patients presented...... there was an immediate clinical improvement with considerable reduction in the edema of upper extremities and head. There was, however, continous dyspnea in five patients (17%) and two patients (7%) had persistent visible collateral venous circulations on the upper chest. There were no stent associated complications...

  8. Decoding the superior parietal lobule connections of the superior longitudinal fasciculus/arcuate fasciculus in the human brain.

    Science.gov (United States)

    Kamali, A; Sair, H I; Radmanesh, A; Hasan, K M

    2014-09-26

    The temporo-parietal (TP) white matter connections between the inferior parietal lobule and superior temporal gyrus as part of the superior longitudinal fasciculus/arcuate fasciculus (SLF/AF) or middle longitudinal fasciculus (MdLF) have been studied in prior diffusion tensor tractography (DTT) studies. However, few studies have been focusing on the higher TP connections of the superior parietal lobule with the temporal lobe. These higher TP connections have been shown to have a role in core processes such as attention, memory, emotions, and language. Our most recent study, for the first time, hinted to the possibility of a long white matter connection interconnecting the superior parietal lobule (SPL) with the posterior temporal lobe in human brain which we call the SLF/AF TP-SPL and for a shorter abbreviation, the TP-SPL. We decided to further investigate this white matter connection using fiber assignment by continuous tracking deterministic tractography and high spatial resolution diffusion tensor imaging on 3T. Five healthy right-handed men (age range 24-37 years) were studied. We delineated the SPL connections of the SLF/AF TP bilaterally in five normal adult human brains. Using a high resolution DTT technique, we demonstrate for the first time, the trajectory of a long fiber bundle connectivity between the SPL and posterior temporal lobe, called the SLF/AF TP-SPL (or the TP-SPL), bilaterally in five healthy adult human brains. We also demonstrate the trajectory of the vertically oriented posterior TP connections, interconnecting the inferior parietal lobule (IPL) with the posterior temporal lobe (TP-IPL) in relation to the TP-SPL, arcuate fasciculus and other major language pathways. In the current study, for the first time, we categorized the TP connections into the anterior and posterior connectivity groups and subcategorized each one into the SPL or IPL connections. Published by Elsevier Ltd.

  9. Sustained attention is associated with right superior longitudinal fasciculus and superior parietal white matter microstructure in children.

    Science.gov (United States)

    Klarborg, Brith; Skak Madsen, Kathrine; Vestergaard, Martin; Skimminge, Arnold; Jernigan, Terry L; Baaré, William F C

    2013-12-01

    Sustained attention develops during childhood and has been linked to the right fronto-parietal cortices in functional imaging studies; however, less is known about its relation to white matter (WM) characteristics. Here we investigated whether the microstructure of the WM underlying and connecting the right fronto-parietal cortices was associated with sustained attention performance in a group of 76 typically developing children aged 7-13 years. Sustained attention was assessed using a rapid visual information processing paradigm. The two behavioral measures of interest were the sensitivity index d' and the coefficient of variation in reaction times (RTCV ). Diffusion-weighted imaging was performed. Mean fractional anisotropy (FA) was extracted from the WM underlying right dorsolateral prefrontal (DLPFC) and parietal cortex (PC), and the right superior longitudinal fasciculus (SLF), as well as equivalent anatomical regions-of-interest (ROIs) in the left hemisphere and mean global WM FA. When analyzed collectively, right hemisphere ROIs FA was significantly associated with d' independently of age. Follow-up analyses revealed that only FA of right SLF and the superior part of the right PC contributed significantly to this association. RTCV was significantly associated with right superior PC FA, but not with right SLF FA. Observed associations remained significant after controlling for FA of equivalent left hemisphere ROIs or global mean FA. In conclusion, better sustained attention performance was associated with higher FA of WM in regions connecting right frontal and parietal cortices. Further studies are needed to clarify to which extent these associations are driven by maturational processes, stable characteristics and/or experience.

  10. Is transnasal TEE imaging a viable alternative to conventional TEE during structural cardiac interventions to avoid general anaesthesia? A pilot comparison study of image quality

    Directory of Open Access Journals (Sweden)

    Dimitris Klettas

    2017-04-01

    Full Text Available Aim: The role of transoesophageal echocardiography in cardiac interventional structural procedures is well established and appreciated. However, the need for general anaesthesia (GA throughout the procedure remains a controversial issue. The aim of the present study is to assess the feasibility and imaging quality of using a transnasal microrobe that allows the usage of conscious sedation in patients who undergo cardiac structural interventional procedures without missing the benefits, guidance and navigation of conventional trans-procedural TEE. Methods: We analysed the trans-procedural images of 24 consecutive patients who underwent TAVI, TMVI or ASD/PFO closure, using a transnasal 2D microprobe (PHILIPS and then we compared them with images taken by using a conventional 3D TEE probe (PHILIPS. In particular, we compared the imaging quality of the two probes regarding: (1 The anatomy, visualisation of valvular calcification and transvalvular colour Doppler of the aortic and mitral valve; (2 the imaging quality of PFO, ASD and interatrial communication colour flow; (3 the imaging of left ventricle systolic function and pericardial space and (4 transgastric imaging. Results: All images were graded with a scale from 5 to 1. The average grade of imaging quality in the mitral valve was: anatomy, 4.3; calcification, 3.8; colour Doppler, 4.2. The average grade of imaging quality in the aortic valve was: anatomy, 4.3; calcification, 3.7; colour Doppler, 4.3. The average grade of imaging quality in PFO/ASD was 4.3. The average grade of imaging quality in LV/pericardial space was 4.2. The average grade of imaging quality in transgastric imaging was 4.1. Conclusion: These results suggest that transnasal TEE can provide good anatomical image quality of relevant cardiac structures during cardiac structural interventions and this may facilitate these procedures being performed during conscious sedation without having to lose TEE guidance.

  11. Intra and inter-rater reliability of infrared image analysis of masticatory and upper trapezius muscles in women with and without temporomandibular disorder Confiabilidade intra e interexaminador da análise de imagens infravermelhas dos músculos mastigatórios e trapézio superior em mulheres com e sem disfunção temporomandibular

    Directory of Open Access Journals (Sweden)

    Ana C. S Costa

    2013-02-01

    Full Text Available BACKGROUND: Infrared thermography is an aid tool that can be used to evaluate several pathologies given its efficiency in analyzing the distribution of skin surface temperature. OBJECTIVES: To propose two forms of infrared image analysis of the masticatory and upper trapezius muscles, and to determine the intra and inter-rater reliability of both forms of analysis. METHOD: Infrared images of masticatory and upper trapezius muscles of 64 female volunteers with and without temporomandibular disorder (TMD were collected. Two raters performed the infrared image analysis, which occurred in two ways: temperature measurement of the muscle length and in central portion of the muscle. The Intraclass Correlation Coefficient (ICC was used to determine the intra and inter-rater reliability. RESULTS: The ICC showed excellent intra and inter-rater values for both measurements: temperature measurement of the muscle length (TMD group, intra-rater, ICC ranged from 0.996 to 0.999, inter-rater, ICC ranged from 0.992 to 0.999; control group, intra-rater, ICC ranged from 0.993 to 0.998, inter-rater, ICC ranged from 0.990 to 0.998, and temperature measurement of the central portion of the muscle (TMD group, intra-rater, ICC ranged from 0.981 to 0.998, inter-rater, ICC ranged from 0.971 to 0.998; control group, intra-rater, ICC ranged from 0.887 to 0.996, inter-rater, ICC ranged from 0.852 to 0.996. CONCLUSION: The results indicated that temperature measurements of the masticatory and upper trapezius muscles carried out by the analysis of the muscle length and central portion yielded excellent intra and inter-rater reliability.CONTEXTUALIZAÇÃO: A termografia infravermelha vem sendo utilizada como instrumento auxiliar na avaliação de patologias diversas, dada a sua eficiência na investigação da distribuição da temperatura superficial cutânea. OBJETIVOS: Propor duas formas de análise das imagens infravermelhas dos músculos mastigatórios e trapézio superior

  12. Intra and inter-rater reliability of infrared image analysis of masticatory and upper trapezius muscles in women with and without temporomandibular disorder Confiabilidade intra e interexaminador da análise de imagens infravermelhas dos músculos mastigatórios e trapézio superior em mulheres com e sem disfunção temporomandibular

    Directory of Open Access Journals (Sweden)

    Ana C. S Costa

    2012-01-01

    Full Text Available BACKGROUND: Infrared thermography is an aid tool that can be used to evaluate several pathologies given its efficiency in analyzing the distribution of skin surface temperature. OBJECTIVES: To propose two forms of infrared image analysis of the masticatory and upper trapezius muscles, and to determine the intra and inter-rater reliability of both forms of analysis. METHOD: Infrared images of masticatory and upper trapezius muscles of 64 female volunteers with and without temporomandibular disorder (TMD were collected. Two raters performed the infrared image analysis, which occurred in two ways: temperature measurement of the muscle length and in central portion of the muscle. The Intraclass Correlation Coefficient (ICC was used to determine the intra and inter-rater reliability. RESULTS: The ICC showed excellent intra and inter-rater values for both measurements: temperature measurement of the muscle length (TMD group, intra-rater, ICC ranged from 0.996 to 0.999, inter-rater, ICC ranged from 0.992 to 0.999; control group, intra-rater, ICC ranged from 0.993 to 0.998, inter-rater, ICC ranged from 0.990 to 0.998, and temperature measurement of the central portion of the muscle (TMD group, intra-rater, ICC ranged from 0.981 to 0.998, inter-rater, ICC ranged from 0.971 to 0.998; control group, intra-rater, ICC ranged from 0.887 to 0.996, inter-rater, ICC ranged from 0.852 to 0.996. CONCLUSION: The results indicated that temperature measurements of the masticatory and upper trapezius muscles carried out by the analysis of the muscle length and central portion yielded excellent intra and inter-rater reliability.CONTEXTUALIZAÇÃO: A termografia infravermelha vem sendo utilizada como instrumento auxiliar na avaliação de patologias diversas, dada a sua eficiência na investigação da distribuição da temperatura superficial cutânea. OBJETIVOS: Propor duas formas de análise das imagens infravermelhas dos músculos mastigatórios e trapézio superior

  13. Isolated Right Superior Vena Cava Drainage into the Left Atrium Diagnosed Noninvasively in the Peripartum Period

    Science.gov (United States)

    Baggett, Charles; Skeen, Shawn J.; Gantt, D. Scott; Trotter, Bradley R.; Birkemeier, Krista L.

    2009-01-01

    Isolated right superior vena cava drainage into the left atrium is an extremely rare cardiac anomaly, especially in the absence of other cardiac abnormalities. Only 28 of 5,127 reported consecutive congenital cardiac cases involved superior vena cava drainage into the left atrium, and all were associated with other cardiac anomalies. Of 19 reported cases of right superior vena cava drainage into the left atrium, most patients have been children who were experiencing mild hypoxemia and cyanosis. Herein, we describe the case of a 34-year-old woman who presented with asymptomatic hypoxemia in the peripartum period. She was diagnosed to have isolated drainage of the right superior vena cava into the left atrium. To the best of our knowledge, this is the 1st reported instance of such diagnosis by use of noninvasive imaging only, without cardiac catheterization. We also review the medical literature that pertains to our patient's anomaly. PMID:20069093

  14. Superior-subordinate relations as organizational processes

    DEFF Research Database (Denmark)

    Asmuss, Birte; Aggerholm, Helle Kryger; Oshima, Sae

    Since the emergence of the practice turn in social sciences (Golsorkhi et al. 2010), studies have shown a number of institutionally relevant aspects as achievements across time and by means of various resources (human and non-human) (Taylor & van Every 2000, Cooren et al. 2006). Such a process view...... superior-subordinate relations in a specific institutionalized setting: performance appraisal interviews (PAIs). While one main task of PAIs is to manage and integrate organizational and employee performance (Fletcher, 2001:473), PAIs are also organizational practices where superior-subordinate relations...... are shaped, (re)confirmed and re-evaluated. This paper pursues the better understanding of the latter aspect by looking at one substantial and recurrent activity in PAIs: the evaluation of employee performance. One resource for doing the evaluation work is making assessments (e.g. Goodwin & Goodwin, 1987...

  15. Exploring the word superiority effect using TVA

    DEFF Research Database (Denmark)

    Starrfelt, Randi

    Words are made of letters, and yet sometimes it is easier to identify a word than a single letter. This word superiority effect (WSE) has been observed when written stimuli are presented very briefly or degraded by visual noise. It is unclear, however, if this is due to a lower threshold...... for perception of words, or a higher speed of processing for words than letters. We have investigated the WSE using methods based on a Theory of Visual Attention. In an experiment using single stimuli (words or letters) presented centrally, we show that the classical WSE is specifically reflected in perceptual...... processing speed: words are simply processed faster than single letters. It is also clear from this experiment, that the word superiority effect can be observed at a large range of exposure durations, from the perceptual threshold to ceiling performance. Intriguingly, when multiple stimuli are presented...

  16. Resolution of superior oblique myokymia with memantine.

    Science.gov (United States)

    Jain, Saurabh; Farooq, Shegufta J; Gottlob, Irene

    2008-02-01

    We describe a novel treatment of superior oblique myokymia. A 40-year-old woman was treated with gabapentin for this disorder with partial success and reported significant side effects including loss of libido and weight gain. After a drug holiday, memantine therapy was initiated resulting in a substantial improvement in her symptoms with far fewer side effects and stability on long-term maintenance therapy.

  17. Locked Superior Dislocation of the Acromioclavicular Joint

    Directory of Open Access Journals (Sweden)

    Salma Eltoum Elamin

    2013-01-01

    Full Text Available Acromioclavicular (AC joint injuries account for approximately 3–5% of shoulder girdle injuries (Rockwood et al., 1998. Depending on severity of injury and direction of displacement these are classified using Rockwood classification system for AC joint dislocation. We present an unusual case presenting with locked superior dislocation of the AC joint highlighting the presentation and subsequent successful surgical management of such case. To our knowledge this has not been reported previously in literature.

  18. Reperfusion hemorrhage following superior mesenteric artery stenting.

    LENUS (Irish Health Repository)

    Moore, Michael

    2012-02-03

    Percutaneous transluminal angioplasty and stent placement is now an established treatment option for chronic mesenteric ischemia and is associated with low mortality and morbidity rates. We present a case of reperfusion hemorrhage complicating endovascular repair of superior mesenteric artery stenosis. Although a recognized complication following repair of carotid stenosis, hemorrhage has not previously been reported following mesenteric endovascular reperfusion. We describe both spontaneous cessation of bleeding and treatment with coil embolization.

  19. [Mitral surgery by superior biatrial septotomy].

    Science.gov (United States)

    Saade, A; Delepine, G; Lemaitre, C; Baehrel, B

    1995-01-01

    The superior biatrial septotomy approach consists of two semicircular right atrial and septal incisions joined at the superior end of the interatrial septum and extended across the dome of the left atrium, allowing exposure of the mitral valve by reflecting the ventricular side using stay sutures. From 1991 to 1993, 81 patients underwent mitral valve surgery by this technic. Mitral valve operation was combined with other cardiac procedures in 30 patients (37%) and was performed as a second operation in 21 patients (25.9%). Duration of cardiopulmonary bypass and aortic occlusion was not significantly different from that of patients operated via a conventional left atrial approach. The five hospital deaths (6.2%) were not related to this operative approach. Only 2 patients (3.3%) with preoperative in sinus rythm were discharged in atrial fibrillation after operation. In one patient (1.6%), atrioventricular block appeared at late follow-up. There were no cases of bleeding, atrioventricular nodal dysfunction or intra-atrial shunting related to the approach. This approach provides excellent exposure of the mitral valve even in unfavorable situations such as a small left atrium, dense adhesions from previous procedures or a previously implanted aortic prosthesis, without damage to various cardiac structures due to excessive traction. No retractor or vena cava repair are required. These data support a wide application of the superior biatrial septotomy approach in mitral valve surgery.

  20. Superior performance of cone beam tomography in detecting a calcaneus fracture.

    Science.gov (United States)

    Lohse, Christian; Catala-Lehnen, Philip; Regier, Marc; Heiland, Max

    2015-01-01

    Cone beam computed tomography is a state-of-the-art imaging tool, initially developed for dental and maxillofacial application. With its high resolution and low radiation dose, cone beam tomography has been expanding its application fields, for example, to diagnosis of traumata and fractures in the head and neck area. In this study, we demonstrate superior and satisfactory performance of cone beam tomography for the imaging of a calcaneus fracture in comparison to conventional X-ray and computed tomography.

  1. The superior vena cava syndrome caused by malignant disease

    Energy Technology Data Exchange (ETDEWEB)

    Eren, Suat [Department of Radiology, Faculty of Medicine, Atatuerk University, 25240 Erzurum (Turkey)]. E-mail: suateren@atauni.edu.tr; Karaman, Adem [Department of Radiology, Faculty of Medicine, Atatuerk University, 25240 Erzurum (Turkey); Okur, Adnan [Department of Radiology, Faculty of Medicine, Atatuerk University, 25240 Erzurum (Turkey)

    2006-07-15

    Objective: The superior vena cava (SVC) obstruction by malignant diseases is either by direct invasion and compression or by tumour thrombus of the SVC. Whatever is its cause, obstruction of the SVC causes elevated pressure in the veins draining into the SVC and increased or reversed blood flow through collateral vessels. Severity of the syndrome depends on the collateral vascular system development. Therefore, imaging of the collateral veins with variable location and connection is important in determining the extension and management of the disease. Our aims are to describe collateral vessels of the superior vena cava syndrome (SVCS) related with the malignant diseases and to assess the ability of multi-detector row CT with multiplanar and 3D volume rendering techniques in determining and describing collateral circulations. Materials and methods: We present CT angiography findings of seven patients with small cell carcinoma of the lung (n = 2), squamous cell carcinoma of the lung (n = 3), Hodgkin disease of the thorax (n = 1), and squamous cell carcinoma of the oesophagus (n = 1). The patients received contrast-enhanced CT scans of the chest and abdomen on a multi-detector row CT during breath holding at suspended inspiration. Results: CT images revealed the cause and level of the SVC obstruction in all patients with axial and multiplanar reconstructed images. The SVC showed total obstruction in five patients and partial obstruction in two patients. The most common experienced collateral vessels were azygos vein (6), intercostal veins (6), mediastinal veins (6), paravertebral veins (5), hemiazygos vein (5), thoracoepigastric vein (5), internal mammary vein (5), thoracoacromioclavicular venous plexus (5), and anterior chest wall veins (5). While one case showed the portal-systemic shunt, V. cordis media and sinus coronarius with phrenic veins were enlarged in two cases, and the left adrenal vein was enlarged in a patient. In one case, the azygos vein with reversed

  2. Superior mesenteric artery compression syndrome - case report

    Directory of Open Access Journals (Sweden)

    Paulo Rocha França Neto

    2011-12-01

    Full Text Available Superior mesenteric artery syndrome is an entity generally caused by the loss of the intervening mesenteric fat pad, resulting in compression of the third portion of the duodenum by the superior mesenteric artery. This article reports the case of a patient with irremovable metastatic adenocarcinoma in the sigmoid colon, that evolved with intense vomiting. Intestinal transit was carried out, which showed important gastric dilation extended until the third portion of the duodenum, compatible with superior mesenteric artery syndrome. Considering the patient's nutritional condition, the medical team opted for the conservative treatment. Four months after the surgery and conservative measures, the patient did not present vomiting after eating, maintaining previous weight. Superior mesenteric artery syndrome is uncommon and can have unspecific symptoms. Thus, high suspicion is required for the appropriate clinical adjustment. A barium examination is required to make the diagnosis. The treatment can initially require gastric decompression and hydration, besides reversal of weight loss through adequate nutrition. Surgery should be adopted only in case of clinical treatment failure.A síndrome da artéria mesentérica superior é uma entidade clínica causada geralmente pela perda do tecido adiposo mesentérico, resultando na compressão da terceira porção do duodeno pela artéria mesentérica superior. Esse artigo relata o caso clínico de uma paciente portadora de adenocarcinoma de cólon sigmoide metastático irressecável, que evoluiu com vômitos incoercíveis. Realizou-se, então, trânsito intestinal que evidenciou dilatação gástrica importante, que se prolongava até a terceira porção duodenal, quadro radiológico compatível com pinçamento da artéria mesentérica superior. Diante da condição nutricional da paciente, foi optado por iniciar medidas conservadoras (porções alimentares pequenas e mais frequentes, além de dec

  3. Superior orbital fissure syndrome in herpes zoster ophthalmicus.

    LENUS (Irish Health Repository)

    Kirwan, R P

    2012-02-01

    AIM: To report a case of superior orbital fissure syndrome (SOFS) in a patient with herpes zoster ophthalmicus (HZO). MATERIALS AND METHODS: A case report. RESULTS: A 71-year-old male with HZO presented acutely to accident and emergency complaining of right vision loss, double vision and drowsiness. The right visual acuity was counting fingers. There was no relative afferent pupillary defect. He had interstitial keratitis, ptosis, proptosis and total ophthalmoplaegia. The signs indicated HZO complicated by SOFS. Brain imaging and lumbar puncture confirmed the diagnosis of varicella zoster encephalitis. Systemic acyclovir and prednisolone led to recovery of visual acuity and ocular motility in addition to resolution of his proptosis and ptosis. CONCLUSION: SOFS is a rare complication of herpes zoster infection. With the appropriate treatment and follow-up, patients may be reassured that recovery of their visual acuity and ocular motility will occur.

  4. Retinal Origin of Direction Selectivity in the Superior Colliculus

    Science.gov (United States)

    Shi, Xuefeng; Barchini, Jad; Ledesma, Hector Acaron; Koren, David; Jin, Yanjiao; Liu, Xiaorong; Wei, Wei; Cang, Jianhua

    2017-01-01

    Detecting visual features in the environment such as motion direction is crucial for survival. The circuit mechanisms that give rise to direction selectivity in a major visual center, the superior colliculus (SC), are entirely unknown. Here, we optogenetically isolate the retinal inputs that individual direction-selective SC neurons receive and find that they are already selective as a result of precisely converging inputs from similarly-tuned retinal ganglion cells. The direction selective retinal input is linearly amplified by the intracollicular circuits without changing its preferred direction or level of selectivity. Finally, using 2-photon calcium imaging, we show that SC direction selectivity is dramatically reduced in transgenic mice that have decreased retinal selectivity. Together, our studies demonstrate a retinal origin of direction selectivity in the SC, and reveal a central visual deficit as a consequence of altered feature selectivity in the retina. PMID:28192394

  5. Retinal origin of direction selectivity in the superior colliculus.

    Science.gov (United States)

    Shi, Xuefeng; Barchini, Jad; Ledesma, Hector Acaron; Koren, David; Jin, Yanjiao; Liu, Xiaorong; Wei, Wei; Cang, Jianhua

    2017-04-01

    Detecting visual features in the environment, such as motion direction, is crucial for survival. The circuit mechanisms that give rise to direction selectivity in a major visual center, the superior colliculus (SC), are entirely unknown. We optogenetically isolate the retinal inputs that individual direction-selective SC neurons receive and find that they are already selective as a result of precisely converging inputs from similarly tuned retinal ganglion cells. The direction-selective retinal input is linearly amplified by intracollicular circuits without changing its preferred direction or level of selectivity. Finally, using two-photon calcium imaging, we show that SC direction selectivity is dramatically reduced in transgenic mice that have decreased retinal selectivity. Together, our studies demonstrate a retinal origin of direction selectivity in the SC and reveal a central visual deficit as a consequence of altered feature selectivity in the retina.

  6. Catheter-Induced Thrombosis of the Superior Vena Cava

    Directory of Open Access Journals (Sweden)

    Elio Venturini

    2012-01-01

    Full Text Available There has been an increase in the use of central venous catheters (CVCs in clinical practice. One of the most dangerous complications associated with their use is symptomatic or asymptomatic thrombosis (T, sometimes associated with superior vena cava (SVC syndrome, resulting from impaired venous drainage. The right heart clots can induce an increased risk of mortality due the potential pulmonary embolism (PE. We report a case of asymptomatic 83-year-old woman in whom the thrombosis was detected after an echocardiogram. Echocardiography demonstrated a cardiac mass, and the T was confirmed by (magnetic resonance imaging MRI. The clinical scenario, a high index of suspicion and routine use of echocardiogram in patients with CVC, can lead to a correct diagnosis, preventing dangerous complications.

  7. Exploring the word superiority effect using TVA

    DEFF Research Database (Denmark)

    Starrfelt, Randi

    Words are made of letters, and yet sometimes it is easier to identify a word than a single letter. This word superiority effect (WSE) has been observed when written stimuli are presented very briefly or degraded by visual noise. It is unclear, however, if this is due to a lower threshold for perc...... simultaneously we find a different pattern: In a whole report experiment with six stimuli (letters or words), letters are perceived more easily than words, and this is reflected both in perceptual processing speed and short term memory capacity....

  8. de educación media superior

    Directory of Open Access Journals (Sweden)

    Enrique Cerón Ferrer

    2007-01-01

    Full Text Available El trabajo presenta los resultados obtenidos en relación al conocimiento y manejo que sobre matemáticas tienen los estudiantes de educación media superior, de los Centros de Estudios Tecnológicos y de Servicios del Distrito Federal, de diferentes carreras que se imparten en estos centros escolares, durante el año 2005. El instrumento de análisis es un cuestionario que contestaron los alumnos, la metodología utilizada es de tipo longitudinal y comparativa.

  9. Pancreaticoduodenectomy with early superior mesenteric artery dissection

    Institute of Scientific and Technical Information of China (English)

    Yu-Fei Xu; Zuo-Jin Liu; Jian-Ping Gong

    2010-01-01

    BACKGROUND: Pancreatic adenocarcinoma remains the fourth leading cause of cancer-related death and is one of the most aggressive human tumors. At present, surgical resection is the only potentially curative treatment. Early neck division is inadequate when invasion of the superior mesenteric artery (SMA) is suspected or in cases of replaced or accessory right hepatic artery. Malignant periampullary tumors often invade retroperitoneal peripancreatic tissues and a positive resection margin is associated with a poor long-term survival. DATA SOURCES: English-language medical databases, PubMed, ELSEVIER and SPRINGERLINK, were searched for articles on"posterior approach pancreaticoduodenectomy","superior mesenteric artery ifrst approach", "retroperitoneal tissue","hanging maneuver", and related topics. RESULTS:The modiifcation allowed the surgeon to early identify the nonresectability of a replaced right hepatic artery if present, enabling complete dissection of the right side of the SMA and portal vein as well as complete excision of the retroportal pancreatic lamina. CONCLUSION: Pancreaticoduodenectomy with early retro-pancreatic dissection is a useful and safe technical variant, which is indicated for the improvement of the safety and curative effect of the procedure.

  10. Radiation treatment of superior sulcus lung carcinoma

    Energy Technology Data Exchange (ETDEWEB)

    Millar, J.; Ball, D.; Worotniuk, V.; Smith, J.; Crennan, E.; Bishop, M. [Peter MacCallum Cancer Inst., East Melbourne, VIC (Australia)

    1996-02-01

    The survival of patients with superior sulcus lung carcinoma and the effects of treatment were reviewed. From a prospective database of 4123 consecutive new patients with lung carcinoma, 131 (3.2%) cases of superior sulcus lung carcinoma were identified. Seventy-four patients were planned to receive radiation with palliative intent, 53 radical radiotherapy and one was observed only. The remaining three patients, with small-cell carcinoma, were treated with chemotherapy with or without radiotherapy. Of the 53 radically treated patients, nine were treated with pre-operative radiation prior to intended radical resection. Analysis was carried out on the effect on survival of performance status, nodal involvement, weight loss, vertebral body or rib involvement, treatment intent and radical combined modality treatment compared with radical radiation alone. The estimated median survival for the whole group was 7.6 months; for those treated radically it was 18.3 months, while for the palliatively treated patients it was 3.7 months. Radically treated patients with no initial nodal involvement had an estimated median survival of 22 months, while radically treated patients with nodal involvement had an estimated median survival of 8.4 months (P = 0.003). There were no statistically significant differences in survival between radically treated patients grouped according to initial weight loss, performance status, or vertebral body and rib involvement. Patients treated with pre-operative radiation did not survive significantly longer than patients treated with radiation alone, although the numbers are small. 33 refs., 2 tabs., 4 figs.

  11. Studies on zooplankton of Lago Paione Superiore

    Directory of Open Access Journals (Sweden)

    Patrizia COMOLI

    1999-08-01

    Full Text Available We report here the results of a three year study on the zooplankton of Lago Paione Superiore, an acid sensitive lake above the tree line in the Italian Alps. The research was carried out within MOLAR, an EC-founded Project on “Measuring and Modeling the dynamic response of remote mountain lakes ecosystems to environmental change”. This study comes after a series of investigations on the effects of acidification, in which we documented the changes occurred with decreasing water pHs, by comparing the recent situation with that in the literature of the 40s, and reconstructed the beginning of anthropogenic disturbance through an analysis of the past cladocera assemblages archived in the lake sediments. A characteristic pattern in seasonal periodicity is a transition from a community dominated by small zooplankton (August to a community where the large particle-feeder Daphnia longispina dominates. This is a typical pattern observed in fishless, copepod-cladocera lakes. Regardless from which food is able to exploit, Daphnia population of Lago Paione Superiore is composed by well-fed organisms, visually rich in lipids, able to produce more than one generation/ year of parthenogenetic females at density levels which are rather high in an oligotrophic high mountain lake.

  12. MRI appearance of the superior transverse scapular ligament

    Energy Technology Data Exchange (ETDEWEB)

    Simeone, F.J.; Bredella, Miriam A.; Chang, Connie Y.; Torriani, Martin; Huang, Ambrose J. [Massachusetts General Hospital, Department of Radiology, Division of Musculoskeletal Imaging and Intervention, Boston, MA (United States)

    2015-11-15

    The superior transverse scapular ligament (STSL) forms the roof of the suprascapular notch, which is the most common location of entrapment of the suprascapular nerve, a cause of shoulder pain and weakness. The purpose of this study is to determine the frequency of visualization of the STSL on routine shoulder MRIs, to identify the sequences and imaging planes on which it is visualized most frequently, and to describe its typical MRI appearance, none of which have been previously addressed in the radiologic literature. One hundred twenty-one consecutive shoulder MRIs were reviewed for the presence or absence of the STSL, including the imaging plane and sequence that best depicted the ligament. Dimensions of the ligament were recorded. Fifty four of 121 shoulder MRIs were technically adequate for visualization of the STSL, and it was identified on 51 of these studies (94 %). There was no statistically significant difference between 1.5-T and 3-T systems. The best individual sequence for visualizing the STSL was the sagittal T1-weighted sequence, in which the STSL was visible on 75/80 technically adequate sequences (94 %). The sagittal plane was the best plane for visualizing the STSL, in which it was visible on 65/69 technically adequate studies (94 %). The STSL on average measured 12.8 ± 1.5 mm in transverse dimension. The STSL can be visualized on the majority of shoulder MRIs and is best seen on sagittal T1-weighted images on our imaging protocol. Evaluation of the STSL can potentially help in identifying pathologic conditions affecting the suprascapular nerve. (orig.)

  13. Cochlear implant outcomes in patients with superior canal dehiscence

    NARCIS (Netherlands)

    Puram, Sidharth V.; Roberts, Daniel S.; Niesten, Marlien E F; Dilger, Amanda E.; Lee, Daniel J.

    2015-01-01

    Objective: To determine whether adult cochlear implant (CI) users with superior canal dehiscence syndrome (SCDS) or asymptomatic superior semicircular canal dehiscence (SCD) have different surgical, vestibular, and audiologic outcomes when compared to CI users with normal temporal bone anatomy. Meth

  14. Superior mesenteric vein thrombosis as a complication of cecal diverticulitis: A case report

    Directory of Open Access Journals (Sweden)

    Soniya Pinto

    2016-01-01

    Full Text Available Pylephlebitis is an uncommon complication of uncontrolled intra-abdominal infection that is associated with high morbidity and mortality. We present our experience with a unique case of cecal diverticulitis and septic thrombophlebitis of the superior mesenteric vein that was promptly diagnosed with high-resolution imaging and blood cultures. Antibiotic and anticoagulation therapy was instituted on confirming the diagnosis with magnetic resonance imaging (MRI to control the infection and prevent propagation of the thrombus. Our case report raises awareness about a rare and potentially fatal condition and provides appropriate imaging supplementation to aid in timely diagnosis.

  15. The Superior Transvelar Approach to the Fourth Ventricle and Brainstem

    OpenAIRE

    Ezer, Haim; Banerjee, Anirban Deep; Bollam, Papireddy; Guthikonda, Bharat; Nanda, Anil

    2012-01-01

    Objective The superior transvelar approach is used to access pathologies located in the fourth ventricle and brainstem. The surgical path is below the venous structures, through the superior medullary velum. Following splitting the tentorial edge, near the tentorial apex, the superior medullary velum is split in the cerebello-mesencephalic fissure. Using the supracerebellar infratentorial, transtentorial or parietal interhemispheric routes, the superior medullary velum is approached. Splittin...

  16. Longitudinal two dimensional strain rate imaging is superior to tissue Doppler imaging in predicting echocardiographic response in cardiac resynchronization therapy%二维斑点追踪显像技术预测心脏再同步治疗的疗效

    Institute of Scientific and Technical Information of China (English)

    史浩颖; 舒先红; 汪芳; 陈灏珠; 刘少稳

    2009-01-01

    Objective The aim of this study was to investigate the ability of longitudinal strain and strain rate imaging by two dimensional speckle tracking in predicting echocardiographic response under cardiac resynchronization therapy (CRT),in comparison with tissue Doppler imaging (TDI). Methods Fifty patients suffering from heart failure,who received CRT,were selected. TDI and two dimensional speckle tracking ima ging in addition to standard echocardiography were performed prior to CRT. The average value of peak longitu dinal strain in 12 left ventricular (LV) segments (Strain-12), the standard deviation of time to peak longitudinal strain in 12 LV segments (Tstrain-SD) and the standard deviation of time to the end of longitudinal systolic strain rate in 6 basal LV segments (Tsr-SD) were calculated. Patients were classified as echocardiographic re sponders if the LV end-systolic volume (LVESV) was reduced > 15% compared with baseline volumes. Re sults No significant difference was seen in baseline Ts-SD,Strain-12 and Tstrain-SD between nonresponders and responders. However, the Tsr-SD was much higher in responders than nonresponders[ (95. 9 ±33. 0)% vs (64. 8 ±39. 6)%,P15%或左心室射血分数(LVEF)绝对值增加>5%的患者.结果 CRT有效组起搏前左心室射血前时间显著长于无效组[(146.0±34.5)ms对(123.5±32.0)ms,P0.05),而CRT有效组的应变率结束时间标准差(Tsr-SD)显著高于无效组(P0.05),而CRT有效组的左心室12节段纵轴反向应变总和(Pstrain-12)显著高于无效组[(12.5±7.9)%对(7.1±8.4)%,P<0.05].将140.5 ms作为截点值,左心室射血前时间预测超声心动图有效的敏感性和特异性分别为63%和79%,将70.7 ms作为截点值,Tsr-SD预测CRT有效的敏感性和特异性分别为73%和65%.结论 常规超声心动图参数中仅左心室射血前时间能预测CRT疗效,二维斑点追踪显像技术的部分参数预测CRT疗效优于组织多普勒.

  17. 14 CFR 385.7 - Exercise of authority by superiors.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 4 2010-01-01 2010-01-01 false Exercise of authority by superiors. 385.7... Exercise of authority by superiors. Any assignment of authority to a staff member other than the Chief... Department's principle of management responsibility, the superior may choose to exercise the assigned power...

  18. The suprameatal dural flap for superior petrosal vein protection during the retrosigmoid intradural suprameatal approach.

    Science.gov (United States)

    Mortini, Pietro; Gagliardi, Filippo; Boari, Nicola; Spina, Alfio; Bailo, Michele; Franzin, Alberto

    2014-01-01

    The drilling of the suprameatal bone during the retrosigmoid intradural suprameatal approach (RISA) puts the superior petrosal vein complex at risk of heating and mechanical injury, which may lead to cerebellar swelling and infarction. We present a new technique to protect the superior petrosal venous complex during suprameatal bone drilling. A microanatomical laboratory investigation on cadaver was conducted. The surgical technique is described and intraoperative schematic pictures are provided. The surgical steps of this technique and the related intraoperative images are reported. One case illustration regarding the removal of a large petrous apex meningioma with Meckel cave extension is described to demonstrate the application of the technique in a clinical setting. Reflecting a dural flap onto the posterior trigeminal nerve root and the superior petrosal vein complex can be a simple way to protect the nerve and the vein during the suprameatal bone drilling during the RISA. Georg Thieme Verlag KG Stuttgart · New York.

  19. Superiority: China Mobile in the competition

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    The market share between China Mobile and China Unicom has stabilized since 2002.It is found that China Mobile has the superiority in the competition, for example, the scissors movement between its revenue and cost indicates that it has a strong profit generating ability and there is enough room for it to reduce the price.The ratio between its price (marginal income) and marginal cost indicates that there is a very distant limit for it to reduce the price.Its demand is obviously flexible with the price, but it does not use the price weapon abundantly.The reason for the stabilization of the market is that China Mobile withdrew from the competition.

  20. Lightning activity during the 1999 Superior derecho

    Science.gov (United States)

    Price, Colin G.; Murphy, Brian P.

    2002-12-01

    On 4 July 1999, a severe convective windstorm, known as a derecho, caused extensive damage to forested regions along the United States/Canada border, west of Lake Superior. There were 665,000 acres of forest destroyed in the Boundary Waters Canoe Area Wilderness (BWCAW) in Minnesota and Quetico Provincial Park in Canada, with approximately 12.5 million trees blown down. This storm resulted in additional severe weather before and after the occurrence of the derecho, with continuous cloud-to-ground (CG) lightning occurring for more than 34 hours during its path across North America. At the time of the derecho the percentage of positive cloud-to-ground (+CG) lightning measured by the Canadian Lightning Detection Network (CLDN) was greater than 70% for more than three hours, with peak values reaching 97% positive CG lightning. Such high ratios of +CG are rare, and may be useful indicators of severe weather.

  1. Analgesia em modelo animal superior para ortopedia

    OpenAIRE

    Oliveira MT, Maria Teresa; Potes, José Alberto; Queiroga, Cristina; Castro, José António; Pereira, Alfredo; Reis, Joana

    2015-01-01

    O teste de novos biomateriais para aplicações clínicas em ortopedia, ou noutras áreas da medicina, em modelos animais vivos e sencientes, em prol do benefício humano, deve ser objecto de planeamento cuidado e ponderado, dado o conflito ético que se coloca. Compete-nos a nós, enquanto investigadores, garantir que as condições de vida, saúde e bem-estar são asseguradas. O uso de ovinos como modelo superior pré-clínico, para investigação em Ortopedia, tem-se evidenciado devido às suas caracterís...

  2. Superior vena cava syndrome in hemodialysis patient

    Directory of Open Access Journals (Sweden)

    Azeb Molhem

    2011-01-01

    Full Text Available Obstruction of blood flow in the superior vena cava (SVC results in symptoms and signs of SVC syndrome. SVC obstruction can be caused either by invasion or external compression of the SVC by contagious pathologic processes involving the right lung, lymph nodes, and other mediastinal structures, or by thrombosis of blood within the SVC. Occasionally, both mechanisms co-exist. We hereby report a case of a 28-year-old male, Saudi patient who was diagnosed with end-stage renal disease and was maintained on regular hemodiaysis via right jugular vein dual lumen catheter for ten months. Three years later, the patient presented with signs and symptoms suggestive of SVC obstruction that was successfully managed with SVC stenting.

  3. [Surgical treatment of superior thoracic outlet syndrome].

    Science.gov (United States)

    Gaibov, A D; Kakhorov, A Z; Sadriev, O N; Yunusov, Kh A

    2015-01-01

    The authors present immediate and long-term results of treatment of 117 patients with superior thoracic outlet syndrome (STOS). There were different reasons for compression of neu- rovascular fascicle in outlet of the thorax. The costaclavicular syndrome was a reason in 48 patients, additional cervical ribs had 36 patients. Skalenus syndrome was noted in 26 cases, rudimentary cervical ribs or hypertrophy of cervical vertebrae C7 had 7 patients. Raynaud's syndrome took place in 19 cases. The required volume of diagnostic procedures and surgical treatment of STOS were determined according to the cause of the syndrome. Differentiated approach to the different forms of STOS was used in relation to dominant symptoms of the disease and reasons for compression of neurovascular fascicle. This allowed getting positive results in majority of patients (90,4%) in long- term period.

  4. ANATOMIC RESEARCH OF SUPERIOR CLUNIAL NERVE TRAUMA

    Institute of Scientific and Technical Information of China (English)

    1999-01-01

    In order to find the mechanism of superior clunial nerve (SCN) trauma, we dissected and revealed SCN from 12 corpses (24 sides). Combining 100 sides of SCN trauma, we inspected the course of SCN, the relation between SCN and it's neighbour tissues with the situation of SCN when being subjected to force. We found that the following special anatomic characteristics and mechanical elements such as the course of SCN, it's turning angles, the bony fibrous tube at the iliac crest, the posterior layer of the lumbodorsal fascia and SCN neighbour adipose tissue, are the causes of external force inducing SCN trauma. The anatomic revealment is the guidance of SCN trauma treatment with edged needle.

  5. Superiorization: An optimization heuristic for medical physics

    CERN Document Server

    Herman, G T; Davidi, R; Censor, Y

    2012-01-01

    Purpose: To describe and mathematically validate the superiorization methodology, which is a recently-developed heuristic approach to optimization, and to discuss its applicability to medical physics problem formulations that specify the desired solution (of physically given or otherwise obtained constraints) by an optimization criterion. Methods: The underlying idea is that many iterative algorithms for finding such a solution are perturbation resilient in the sense that, even if certain kinds of changes are made at the end of each iterative step, the algorithm still produces a constraints-compatible solution. This property is exploited by using permitted changes to steer the algorithm to a solution that is not only constraints-compatible, but is also desirable according to a specified optimization criterion. The approach is very general, it is applicable to many iterative procedures and optimization criteria used in medical physics. Results: The main practical contribution is a procedure for automatically p...

  6. STEREO Superior Solar Conjunction Mission Phase

    Science.gov (United States)

    Ossing, Daniel A.; Wilson, Daniel; Balon, Kevin; Hunt, Jack; Dudley, Owen; Chiu, George; Coulter, Timothy; Reese, Angel; Cox, Matthew; Srinivasan, Dipak; hide

    2017-01-01

    With its long duration and high gain antenna (HGA) feed thermal constraint; the NASA Solar-TErestrial RElations Observatory (STEREO) solar conjunction mission phase is quite unique to deep space operations. Originally designed for a two year heliocentric orbit mission to primarily study coronal mass ejection propagation, after 8 years of continuous science data collection, the twin STEREO observatories entered the solar conjunction mission phase, for which they were not designed. Nine months before entering conjunction, an unforeseen thermal constraint threatened to stop daily communications and science data collection for 15months. With a 3.5 month long communication blackout from the superior solar conjunction, without ground commands, each observatory will reset every 3 days, resulting in 35 system resets at an Earth range of 2 AU. As the observatories will be conjoined for the first time in 8 years, a unique opportunity for calibrating the same instruments on identical spacecraft will occur. As each observatory has lost redundancy, and with only a limited fidelity hardware simulator, how can the new observatory configuration be adequately and safely tested on each spacecraft? Without ground commands, how would a 3-axis stabilized spacecraft safely manage the ever accumulating system momentum without using propellant for thrusters? Could science data still be collected for the duration of the solar conjunction mission phase? Would the observatories survive? In its second extended mission, operational resources were limited at best. This paper discusses the solutions to the STEREO superior solar conjunction operational challenges, science data impact, testing, mission operations, results, and lessons learned while implementing.

  7. 双侧小脑上脚各向异性分数与年龄相关性的初步研究%Preliminary study of age-related changes in fractional anisotropy of bilateral superior cerebellar peduncles with MR diffusion tensor imaging

    Institute of Scientific and Technical Information of China (English)

    吴珂; 王君霞; 马得廷; 张有军; 谢元忠

    2015-01-01

    目的:应用磁共振弥散张量成像(DTI)定量评估双侧小脑上脚各向异性分数(FA)值,并探讨与年龄之间的相关性。方法回顾性分析110例健康受检者DTI图像数据,男54例,女56例,14~79岁,平均50.8岁。由一名专家运用感兴趣区(ROI)功能在FA图上测量双侧小脑上脚的FA值。双侧小脑上脚的FA值的比较采用配对样本t检验,FA值与年龄的相关性采用双变量相关分析。结果110例健康者中,双侧小脑上脚的FA值分别为0.707±0.050、0.712±0.050,无统计学差异(t=-1.829,P=0.000)。右侧小脑上脚FA值与年龄呈正相关(r=0.400,P=0.000),左侧小脑上脚FA值与年龄呈正相关(r=0.432,P=0.000)。结论双侧小脑上脚的FA值均与年龄呈正相关性,反映了小脑上脚随年龄的生理变化过程,可为相关研究提供参考。%Objective This study is to evaluate the fractional anisotropy (FA) values of bilateral superior cerebellar peduncle (SCP) and explore the relationship between patient’s age and FA value of the SCPs.MethodsAxial FA maps of 110 neurologically normal subjects (54 men, 56 women; age range: 14-79 years, mean age: 50.8 years) using diffusion tensor imaging (DTI) were evaluated retrospectively. Measurement of the FA values was done by one radiologist and by placing circular ROIs in the SCPs. Paried-Samplet-test was used to evaluate the difference of FA values of bilateral SCPs. Bivariate correlation analysis was performed to evaluate the effects of age.ResultsIn 110 healthy patients, the mean FA value was slightly lower in the right SCP (0.707±0.050) than in the left SCP (0.712±0.050), the difference was not significant (t=-1.829,P=0.000). Bivariate linear regression models revealed that there was a moderate positive correlation between age and the FA value in the right SCP (r=0.400,P=0.000) and left SCP (r=0.432,P=0.000).ConclusionThe FA value of the bilateral SCPs

  8. Migration of central lines from the superior vena cava to the azygous vein

    Energy Technology Data Exchange (ETDEWEB)

    Haygood, T.M., E-mail: tamara.haygood@mdanderson.org [University of Texas, MD Anderson Cancer Center, 1515 Holcombe Blvd, Unit 1475, Houston, TX 77030 (United States); Malhotra, K., E-mail: kmalhotra@mdanderson.org [University of Texas, MD Anderson Cancer Center, 1515 Holcombe Blvd, Unit 1475, Houston, TX 77030 (United States); Ng, C., E-mail: cng@mdanderson.org [University of Texas, MD Anderson Cancer Center, 1515 Holcombe Blvd, Unit 1475, Houston, TX 77030 (United States); Chasen, B., E-mail: beth.chasen@mdanderson.org [University of Texas, MD Anderson Cancer Center, 1515 Holcombe Blvd, Unit 1475, Houston, TX 77030 (United States); McEnery, K.W., E-mail: kmcenery@mdanderson.org [University of Texas, MD Anderson Cancer Center, 1515 Holcombe Blvd, Unit 1475, Houston, TX 77030 (United States); Chasen, M., E-mail: mchasen@mdanderson.org [University of Texas, MD Anderson Cancer Center, 1515 Holcombe Blvd, Unit 1475, Houston, TX 77030 (United States)

    2012-01-15

    Aim: To report 11 cases of central venous access catheters migrating from the superior vena cava to the azygos vein in order to raise radiologists' awareness of this possibility. Materials and methods: This is a retrospective review of the clinical history and imaging of 11 patients whose central line migrated from the superior vena cava to the azygos vein. The time course of migration, access route of the catheters, outcome, and depth of placement in the superior vena cava were evaluated. Results: All of these catheters were placed from the left; six through the subclavian vein, four as PICC lines, and one from the left internal jugular vein. Seven of the catheters were originally positioned in the superior vena cava. Four of the catheters were originally positioned in the azygos vein and were repositioned into the superior vena cava at the time of placement. The time to migration ranged from 2 to 126 days, average 43 days. In three cases, the migration was not reported at the first opportunity, resulting in a delay in diagnosis ranging from 10 to 27 days. All but one of the catheters extended at least 3.5 cm (range 1.8-7 cm) below the top of the right mainstem bronchus when in the superior vena cava. Conclusion: Risk factors for migration into the azygos vein include placement from a left-sided approach and original positioning in the azygos vein with correction at placement. The depth of placement in the superior vena cava was not a protective factor. It is important to recognize migration because of the elevated risk of complications when central lines are placed in the azygos vein.

  9. Reproduction of superior sagittal sinus animal model by bypass transplantation of biomaterial graft

    Directory of Open Access Journals (Sweden)

    Qing-yong LUO

    2011-03-01

    Full Text Available Objective To establish the beagles model of superior sagittal sinus bypass graft,and explore the feasibility of reconstruction of superior sagittal sinus with biomaterials using this model.Methods Eight adult male beagles(weight: 12.5-22.0kg were involved in the present study.The superior sagittal sinus was exposed and blocked via bone window,and then anastomosed side-to-end to the biomaterial graft under the dedicated microscope of neurosurgery surgery,expectant treatment such as anti-inflammatory was given for the animals.The digital subtraction venography(DSV and color Doppler flow imaging(CDFI of superior sagittal sinus were performed in 1,2,4 and 8 weeks after the operation.Eight weeks after the operation,all the animals were sacrificed and the material graft was examined histologically.Results The DSV and CDFI of superior sagittal sinus showed that the stomas of 2 beagles were with slight stenosis and high flow velocity,of 1 beagle with small leakage and low flow velocity,while of other 5 beagles were normal.The histological examination showed endothelial cells were growing on the graft and superior sagittal sinus,and crawling toward the lumen of graft 8 weeks after the operation.Conclusion The beagles model of superior sagittal sinus bypass graft was established successfully.The short-term effect of the model was satisfactory,while further work should be performed to determine the long-term effects.

  10. Posterior semicircular canal dehiscence: a morphologic cause of vertigo similar to superior semicircular canal dehiscence

    Energy Technology Data Exchange (ETDEWEB)

    Krombach, G.A.; Schmitz-Rode, T.; Haage, P.; Guenther, R.W. [Department of Diagnostic Radiology, University of Technology, Pauwelstrasse 30, 52057, Aachen (Germany); DiMartino, E. [Department of Otorhinolaryngology, University of Technology, Pauwelstrasse 30, 52057, Aachen (Germany); Prescher, A. [Department of Anatomy, University of Technology, Pauwelstrasse 30, 52057, Aachen (Germany); Kinzel, S. [Department of Experimental Veterinarian Medicine, University of Technology, Pauwelstrasse 30, 52057, Aachen (Germany)

    2003-06-01

    Heading Abstract.The aim of this study was to assess imaging findings of posterior semicircular dehiscence on computed tomography and to evaluate incidence of posterior and superior semicircular canal dehiscence in patients presenting with vertigo, sensorineuronal hearing loss or in a control group without symptoms related to the inner ear. Computed tomography was performed in 507 patients presenting either with vertigo (n=128; 23 of these patients suffered also from sensorineuronal hearing loss), other symptoms related to the inner ear, such as hearing loss or tinnitus (n=183) or symptoms unrelated to the labyrinth (n=196). All images were reviewed for presence of dehiscence of the bone, overlying the semicircular canals. Twenty-nine patients had superior semicircular canal dehiscence. Of these patients, 83% presented with vertigo, 10% with hearing loss or tinnitus and the remaining 7% with symptoms unrelated to the inner ear. In 23 patients dehiscence of the posterior semicircular canal was encountered. Of these patients, 86% presented with vertigo, 9% with hearing loss or tinnitus and 5% with symptoms unrelated to the inner ear. Defects of the bony overly are found at the posterior semicircular canal, in addition to the recently introduced superior canal dehiscence syndrome. Significant prevalence of vertigo in these patients suggests that posterior semicircular canal dehiscence can cause vertigo, similar to superior semicircular canal dehiscence. (orig.)

  11. Superior temporal gyrus volume reduction and P300 in schizophrenia prior to treatment

    Energy Technology Data Exchange (ETDEWEB)

    Hirayasu, Akira; Hokama, Hiroto; Ogura, Chikara; Ohta, Hirokazu; Arakaki, Hajime; Asato, Naohiko; Yamaguchi, Keiichiro [Ryukyus Univ., Nishihara, Okinawa (Japan). Faculty of Medicine

    1998-07-01

    Authors measured the superior temporal gyrus volume by 3D MRI imaging for the schizophrenics and simultaneously recorded the P300 component during the auditory odd-ball exercise. Subjects were 8 cases of schizophrenics and the sex- and age-matched healthy control adults. In schizophrenics, the superior temporal gyrus volume reduction was found. When the superior temporal gyrus was divided into two parts, the anterior part containing the primary auditory area, and the posterior part containing the planum temporale and the Wernicle speech area, the volume reduction of left side in the posterior part was remarkable. There was no difference in the latent time and the P300 amplitude between schizophrenics and healthy controls, suggesting that the superior temporal gyrus abnormalities will appear prior to P300 abnormalities. We could not find any correlation between findings of MRI and P300 and psychic symptoms. We discuss the possible contribution on the elucidation of the pathogenesis of the schizophrenia by simultaneous recordings of 3D MRI imaging and the event-related potentials. (K.H.)

  12. All you need to know about the tricuspid valve: Tricuspid valve imaging and tricuspid regurgitation analysis.

    Science.gov (United States)

    Huttin, Olivier; Voilliot, Damien; Mandry, Damien; Venner, Clément; Juillière, Yves; Selton-Suty, Christine

    2016-01-01

    The acknowledgment of tricuspid regurgitation (TR) as a stand-alone and progressive entity, worsening the prognosis of patients whatever its aetiology, has led to renewed interest in the tricuspid-right ventricular complex. The tricuspid valve (TV) is a complex, dynamic and changing structure. As the TV is not easy to analyse, three-dimensional imaging, cardiac magnetic resonance imaging and computed tomography scans may add to two-dimensional transthoracic and transoesophageal echocardiographic data in the analysis of TR. Not only the severity of TR, but also its mechanisms, the mode of leaflet coaptation, the degree of tricuspid annulus enlargement and tenting, and the haemodynamic consequences for right atrial and right ventricular morphology and function have to be taken into account. TR is functional and is a satellite of left-sided heart disease and/or elevated pulmonary artery pressure most of the time; a particular form is characterized by TR worsening after left-sided valve surgery, which has been shown to impair patient prognosis. A better description of TV anatomy and function by multimodality imaging should help with the appropriate selection of patients who will benefit from either surgical TV repair/replacement or a percutaneous procedure for TR, especially among patients who are to undergo or have undergone primary left-sided valvular surgery.

  13. Cardiac Resynchronization Therapy in a Patient with Persistent Left Superior Vena Cava Draining into the Coronary Sinus and Absent Innominate Vein: A Case Report and Review of Literature

    Directory of Open Access Journals (Sweden)

    Girish M. Nair, MBBS, MSc, FRCPC

    2014-09-01

    Conclusions: Superior venous anomalies such as PLSVC can make CIED implantation technically challenging. However, with increasing operator experience, cardiac imaging and appropriate tools successful CIED implantation is possible in almost all cases.

  14. Lake Superior Coastal Wetland Fish Assemblages and ...

    Science.gov (United States)

    The role of the coastal margin and the watershed context in defining the ecology of even very large lakes is increasingly being recognized and examined. Coastal wetlands are both important contributors to the biodiversity and productivity of large lakes and important mediators of the lake-basin connection. We explored wetland-watershed connections and their relationship to wetland function and condition using data collected from 37 Lake Superior wetlands spanning a substantial geographic and geomorphic gradient. While none of these wetlands are particularly disturbed, there were nevertheless clear relationships between watershed landuse and wetland habitat and biota, and these varied consistently across wetland type categories that reflected the strength of connection to the watershed. For example, water clarity and vegetation structure complexity declined with decreasing percent natural land cover, and these effects were strongest in riverine wetlands (having generally large watersheds and tributary-dominated hydrology) and weakest in lagoon wetlands (having generally small watersheds and lake-dominate hydrology). Fish abundance and species richness both increased with decreasing percent natural land cover while species diversity decreased, and again the effect was strongest in riverine wetlands. Lagoonal wetlands, which lack any substantial tributary, consistently harbored the fewest species of fish and a composition different from the more watershed-lin

  15. The MDCT and MRI Findings of a Pancreatic Arteriovenous Malformation Combined with Isolated Dissection of the Superior Mesenteric Artery: A Case Report

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Yong Soo; Jeong, Woo Kyoung [Hanyang University Guri Hospital, Seoul (Korea, Republic of); Kim, Jin Oo [Naval Pohang Hospital, Pohang (Korea, Republic of); Oh, Ji Young; Song, Soon Young [Hanyang University Medical College, Seoul (Korea, Republic of)

    2010-03-15

    Pancreatic arteriovenous malformation and isolated spontaneous dissection of the superior mesenteric artery are both rare maladies, and now they can be easily diagnosed due to the development of such noninvasive modalities as multi-detector computed tomography and magnetic resonance imaging. We report here on the multi-detector computed tomography and magnetic resonance imaging findings of a rare case of pancreatic arteriovenous malformation combined with isolated dissection of the superior mesenteric artery.

  16. 垂体窝上口形态学特点与垂体腺瘤生长关系的影像学研究%Imaging study of the relationship between morphological features of pituitary fossa superior orifice and growth pattern of pituitary adenomas

    Institute of Scientific and Technical Information of China (English)

    韦拳堂; 漆松涛; 彭玉平; 陆云涛; 龙浩; 王剑新

    2012-01-01

    Objective To explore the relationship between morphological features of pituitary fossa superior orifice and growth pattern of pituitary adenomas. Methods One hundred patients with pituitary adenomas were selected as pituitary adenoma. One hundred healthy people were set as normal control group. Head CT scan was used to observe the anatomical features of the pituitary fossa superior orifice in healthy people and the sella turcica in patients with pituitary adenoma. The effect of morphological features of pituitary fossa superior orifice on the growth pattern of pituitary adenoma was analyzed. Results The slant angle of pituitary fossa superior orifice was 0.79°±l 1.69° in healthy people and -1.73°±12.42° in pituitary adenoma group. The angle in normal control group can be classified into three types, namely anteverted type, horizontal type and retroverted type. The angle between the longest diameter of tumor and pituitary fossa superior orifice was 91.18°±10.24° in pituitary adenoma patients. According to morphology of the sella turcica, the tumor was of sac type in 41 patients, wok type in 24, cylinder type in 13 and cribriform type in 22. Conclusions Pituitary adenoma grows upward basically perpendicularly to pituitary fossa superior orifice. The slant angle of pituitary fossa superior orifice determines the growth direction of pituitary adenoma toward suprasella.%目的 探讨垂体窝上口形态学特点与垂体腺瘤生长方式的关系.方法 收集100例垂体腺瘤病人作为垂体腺瘤组,正常对照组为100例健康人.运用CT扫描观察正常人垂体窝上口与垂体腺瘤病人蝶鞍的解剖特点,并分析垂体窝上口形态学特点对垂体腺瘤生长方式的影响.结果 正常对照组垂体窝上口倾斜角为(0.79°±11.69°),垂体腺瘤组为(-1.73°±12.42°).该夹角在正常人可分为前倾型、水平型、后仰型.肿瘤最长径与垂体窝上口之间的夹角为(91.18°±10.24°).垂体腺瘤根据蝶鞍

  17. Deep Orbital Dermoid Cyst Bulging into the Superior Orbital Fissure: Clinical Presentation and Management

    Science.gov (United States)

    Kumar, Ravinder; Vyas, Kapil; Jaiswal, Gagan; Bhargava, Abhishek; Kundu, Jyoti

    2017-01-01

    Purpose: To present a case of deep orbital dermoid cyst with emphasis on clinical presentation, imaging spectrum, differential diagnosis and management. Case Report: A 28-year-old female was referred to our hospital with chief complaint of drooping of right eyelid and progressive headache. Ocular motility, visual acuity and fundus examination were normal. computed tomography (CT) and magnetic resonance imaging (MRI) revealed a well-defined, intraosseous deep orbital dermoid cyst (5.9 mm × 12.5 mm) located near the apex of right orbit, extending from greater wing of sphenoid into the superior orbital fissure. Due to occulomotor nerve (superior and inferior divisions) compression which passes through the superior orbital fissure, ipsilateral headache and ptosis occurred. Complete surgical excision of cyst was performed using noninvasive extracranial lateral orbitotomy approach. After removal of the cyst, curette and cutting drill were used to thoroughly remove any residual cystic content. Histopathological analysis confirmed the diagnosis. The healing was uneventful postoperatively. Conclusion: CT and MRI are easy, reliable, safe and effective imaging methods for establishing the diagnosis of orbital dermoid cyst. Size, location and manifestations are the most important determinants of the disease management. Complete surgical excision without rupture of the cyst is the treatment of choice. PMID:28299014

  18. Carbon phosphide monolayers with superior carrier mobility

    Science.gov (United States)

    Wang, Gaoxue; Pandey, Ravindra; Karna, Shashi P.

    2016-04-01

    Two dimensional (2D) materials with a finite band gap and high carrier mobility are sought after materials from both fundamental and technological perspectives. In this paper, we present the results based on the particle swarm optimization method and density functional theory which predict three geometrically different phases of the carbon phosphide (CP) monolayer consisting of sp2 hybridized C atoms and sp3 hybridized P atoms in hexagonal networks. Two of the phases, referred to as α-CP and β-CP with puckered or buckled surfaces are semiconducting with highly anisotropic electronic and mechanical properties. More remarkably, they have the lightest electrons and holes among the known 2D semiconductors, yielding superior carrier mobility. The γ-CP has a distorted hexagonal network and exhibits a semi-metallic behavior with Dirac cones. These theoretical findings suggest that the binary CP monolayer is a yet unexplored 2D material holding great promise for applications in high-performance electronics and optoelectronics.Two dimensional (2D) materials with a finite band gap and high carrier mobility are sought after materials from both fundamental and technological perspectives. In this paper, we present the results based on the particle swarm optimization method and density functional theory which predict three geometrically different phases of the carbon phosphide (CP) monolayer consisting of sp2 hybridized C atoms and sp3 hybridized P atoms in hexagonal networks. Two of the phases, referred to as α-CP and β-CP with puckered or buckled surfaces are semiconducting with highly anisotropic electronic and mechanical properties. More remarkably, they have the lightest electrons and holes among the known 2D semiconductors, yielding superior carrier mobility. The γ-CP has a distorted hexagonal network and exhibits a semi-metallic behavior with Dirac cones. These theoretical findings suggest that the binary CP monolayer is a yet unexplored 2D material holding great

  19. Absent right superior caval vein in situs solitus

    DEFF Research Database (Denmark)

    Lytzen, Rebekka; Sundberg, Karin; Vejlstrup, Niels

    2015-01-01

    no postnatal complications. All children were found to have healthy hearts at follow-up. CONCLUSIONS: In all cases, the findings proved to be a benign condition with no clinical manifestations or complications. Although isolated absent right superior caval vein does not seem to affect the outcome, associated......Introduction In up to 0.07% of the general population, the right anterior cardinal vein obliterates and the left remains open, creating an absent right superior caval vein and a persistent left superior caval vein. Absent right superior caval vein is associated with additional congenital heart...... disease in about half the patients. We wished to study the consequences of absent right superior caval vein as an incidental finding on prenatal ultrasonic malformation screening. Material and methods This is a retrospective case series study of all foetuses diagnosed with absent right superior caval vein...

  20. The Business Value of Superior Energy Performance

    Energy Technology Data Exchange (ETDEWEB)

    McKane, Aimee; Scheihing, Paul; Evans, Tracy; Glatt, Sandy; Meffert, William

    2015-08-04

    Industrial facilities participating in the U.S. Department of Energy’s (US DOE) Superior Energy Performance (SEP) program are finding that it provides them with significant business value. This value starts with the implementation of ISO 50001-Energy management system standard, which provides an internationally-relevant framework for integration of energy management into an organization’s business processes. The resulting structure emphasizes effective use of available data and supports continual improvement of energy performance. International relevance is particularly important for companies with a global presence or trading interests, providing them with access to supporting ISO standards and a growing body of certified companies representing the collective knowledge of communities of practice. This paper examines the business value of SEP, a voluntary program that builds on ISO 50001, inviting industry to demonstrate an even greater commitment through third-party verification of energy performance improvement to a specified level of achievement. Information from 28 facilities that have already achieved SEP certification will illustrate key findings concerning both the value and the challenges from SEP/ISO 50001 implementation. These include the facilities’ experience with implementation, internal and external value of third-party verification of energy performance improvement; attractive payback periods and the importance of SEP tools and guidance. US DOE is working to bring the program to scale, including the Enterprise-Wide Accelerator (SEP for multiple facilities in a company), the Ratepayer-Funded Program Accelerator (supporting tools for utilities and program administrators to include SEP in their program offerings), and expansion of the program to other sectors and industry supply chains.

  1. Hypothalamic germinoma masquerading as superior mesenteric artery (SMA) syndrome.

    Science.gov (United States)

    Vethakkan, Shireene R; Venugopal, Yogeswari; Tan, Alexander T B; Paramasivam, Sharmila S; Ratnasingam, Jeyakantha; Razak, Rohaya A; Alias, Azmi; Kassim, Fauziah; Choong, Karen

    2013-01-01

    To report a case of superior mesenteric artery (SMA) syndrome secondary to hypothalamic germinoma. We describe the clinical presentation, diagnostic work-up, management, and clinical course of a patient admitted with SMA syndrome who was subsequently found to have a hypothalamic germinoma. An adolescent boy was admitted to the surgical ward with progressive weight loss over a 2 year period and postprandial vomiting. He was diagnosed with SMA syndrome based on evidence of proximal duodenal dilatation, extrinsic compression of the distal duodenum, and a narrowed aortomesenteric angle (16°). Investigations performed to exclude thyrotoxicosis unexpectedly revealed secondary hypothyroidism and further evaluation demonstrated evidence of pan-hypopituitarism. Psychiatric evaluation excluded anorexia nervosa and bulimia. Magnetic resonance imaging (MRI) of the brain revealed a heterogeneously enhancing hypothalamic lesion, but a normal pituitary gland. Hormone replacement with hydrocortisone, desmopressin, testosterone, and thyroxine resulted in weight gain and resolution of gastrointestinal symptoms. A transventricular endoscopic biopsy subsequently confirmed a hypothalamic germinoma and he was referred to an oncologist. SMA syndrome secondary to severe weight loss is an uncommon cause of upper gastrointestinal obstruction. While there have been reports of poorly controlled diabetes mellitus and thyrotoxicosis manifesting as SMA syndrome, there are no published reports to date of SMA syndrome secondary to hypothalamic/pituitary disease. Management of SMA syndrome is conservative, as symptoms of intestinal obstruction resolve with weight gain following treatment of the underlying cause. Awareness of this uncommon presentation of endocrine cachexia/hypothalamic disease will prevent unnecessary laparotomies and a misdiagnosis of an eating disorder.

  2. The superior mesenteric artery syndrome in patients with spinal deformity.

    Science.gov (United States)

    Altiok, Haluk; Lubicky, John P; DeWald, Christopher J; Herman, Jean E

    2005-10-01

    A retrospective review. To determine the incidence of the superior mesenteric artery syndrome (SMAS) after surgical correction for scoliosis and if it is influenced by newer derotation/translation surgical systems. The SMAS is a known complication after surgery. Of 2939 charts reviewed, 17 patients between 1960 and 2002 matched inclusion criteria. Our incidence of the SMAS was 0.5%. Onset of symptoms was 7.2 days. Several scoliosis diagnoses were included in the study group. Instrumentation that was used included: nondistraction systems (n = 14), Harrington rod with body cast (n = 1), Luque rod with sublaminar wires (n = 1), and casted in situ posterior spinal fusion (n = 1). Before surgery, 10 of 17 patients weighed less than the 50th percentile. Mean preoperative BMI was 18.6 kg/cm/cm. Postoperative height gain averaged 3.175 cm, and weight loss at onset of symptoms averaged 4.5 kg. There were 14 patients who required nasogastric suction for an average duration of 10.2 days, 11 required hyperalimentation, and 5 concurrently received hyperalimentation with enteric feeding. The SMAS recurred in 2 patients. Postoperative weight loss appears to be more important for the development of the SMAS than asthenic body type. Newer derotation/translation corrective techniques have not eliminated the SMAS. Gastrointestinal imaging is indicated when nausea and vomiting occur 6-12 days after surgery, associated with early satiety and normal bowel sounds. Decompression and nutritional support remain the mainstays of treatment.

  3. Coding of multisensory temporal patterns in human superior temporal sulcus

    Directory of Open Access Journals (Sweden)

    Toemme eNoesselt

    2012-08-01

    Full Text Available Philosophers, psychologists, and neuroscientists have long been interested in how the temporal aspects of perception are represented in the brain. In the present study, we investigated the neural basis of the temporal perception of synchrony/asynchrony for audiovisual speech stimuli using functional magnetic imaging (fMRI. Subjects judged the temporal relation of (asynchronous audiovisual speech streams, and indicated any changes in their perception of the stimuli over time. Differential hemodynamic responses for synchronous versus asynchronous stimuli were observed in the multisensory superior temporal sulcus complex (mSTS-c and prefrontal cortex. Within mSTS-c we found adjacent regions expressing an enhanced BOLD-response to the different physical (asynchrony conditions. These regions were further modulated by the subjects’ perceptual state. By calculating the distances between the modulated regions within mSTS-c in single-subjects we demonstrate that the ‘auditory’ and ‘visual leading areas’ lie closer to ‘synchrony areas’ than to each other. Moreover, analysis of interregional connectivity indicates a stronger functional connection between multisensory prefrontal cortex and mSTS-c during the perception of asynchrony. Taken together, these results therefore suggest the presence of distinct sub-regions within the human STS-c for the maintenance of temporal relations for audiovisual speech stimuli plus differential functional connectivity with prefrontal regions. The respective local activity in mSTS-c is dependent both upon the physical properties of the stimuli presented and upon the subjects’ perception of (asynchrony.

  4. Smaller superior temporal gyrus volume specificity in schizotypal personality disorder

    Science.gov (United States)

    Goldstein, Kim E.; Hazlett, Erin A.; New, Antonia S.; Haznedar, M. Mehmet; Newmark, Randall E.; Zelmanova, Yuliya; Passarelli, Vincent; Weinstein, Shauna R.; Canfield, Emily L.; Meyerson, David A.; Tang, Cheuk Y.; Buchsbaum, Monte S.; Siever, Larry J.

    2009-01-01

    Background Superior temporal gyrus (STG/BA22) volume is reduced in schizophrenia and to a milder degree in schizotypal personality disorder (SPD), representing a less severe disorder in the schizophrenia-spectrum. SPD and Borderline personality disorder (BPD) are severe personality disorders characterized by social and cognitive dysfunction. However, while SPD is characterized by social withdrawal/anhedonia, BPD is marked by hyper-reactivity to interpersonal stimuli and hyper-emotionality. This is the first morphometric study to directly compare SPD and BPD patients in temporal volume. Methods We compared three age-gender- and education-matched groups: 27 unmedicated SPD individuals with no BPD traits, 52 unmedicated BPD individuals with no SPD traits, and 45 healthy controls. We examined gray matter volume of frontal and temporal lobe Brodmann areas (BAs), and dorsal/ventral amygdala from 3T magnetic resonance imaging. Results In the STG, an auditory association area reported to be dysfunctional in SPD and BPD, the SPD patients had significantly smaller volume than healthy controls and BPD patients. No group differences were found between BPD patients and controls. Smaller BA22 volume was associated with greater symptom severity in SPD patients. Reduced STG volume may be an important endophenotype for schizophrenia-spectrum disorders. SPD is distinct from BPD in terms of STG volume abnormalities which may reflect different underlying pathophysiological mechanisms and could help discriminate between them. PMID:19473820

  5. Vowel sound extraction in anterior superior temporal cortex.

    Science.gov (United States)

    Obleser, Jonas; Boecker, Henning; Drzezga, Alexander; Haslinger, Bernhard; Hennenlotter, Andreas; Roettinger, Michael; Eulitz, Carsten; Rauschecker, Josef P

    2006-07-01

    We investigated the functional neuroanatomy of vowel processing. We compared attentive auditory perception of natural German vowels to perception of nonspeech band-passed noise stimuli using functional magnetic resonance imaging (fMRI). More specifically, the mapping in auditory cortex of first and second formants was considered, which spectrally characterize vowels and are linked closely to phonological features. Multiple exemplars of natural German vowels were presented in sequences alternating either mainly along the first formant (e.g., [u]-[o], [i]-[e]) or along the second formant (e.g., [u]-[i], [o]-[e]). In fixed-effects and random-effects analyses, vowel sequences elicited more activation than did nonspeech noise in the anterior superior temporal cortex (aST) bilaterally. Partial segregation of different vowel categories was observed within the activated regions, suggestive of a speech sound mapping across the cortical surface. Our results add to the growing evidence that speech sounds, as one of the behaviorally most relevant classes of auditory objects, are analyzed and categorized in aST. These findings also support the notion of an auditory "what" stream, with highly object-specialized areas anterior to primary auditory cortex. 2005 Wiley-Liss, Inc.

  6. Coronary artery bypass and superior vena cava syndrome.

    OpenAIRE

    Thomas, T V; Masrani, K; Thomas, J.L.

    1999-01-01

    Superior vena cava syndrome is the obstruction of the superior vena cava or its main tributaries by benign or malignant lesions. The syndrome causes edema and engorgement of the vessels on the face, neck, and arms, nonproductive cough, and dyspnea. We discuss the case of a 48-year-old obese diabetic woman who was admitted with unstable angina. She had previously been diagnosed with superior vena cava syndrome. Urgent coronary artery bypass grafting was necessary Although thousands of coronary...

  7. 77 FR 48856 - Safety Zone; Superior Bay, Duluth, MN

    Science.gov (United States)

    2012-08-15

    ... spectators during the Superior Man Triathlon. DATES: This rule is effective from 6 a.m. to 8:30 a.m. on... Triathlon, which are discussed further below. Under 5 U.S.C. 553(d)(3), the Coast Guard finds that good... inaugural Superior Man Triathlon will occur along the Bay of Lake Superior. The 1.2 mile swim leg of...

  8. Region-Based Image-Fusion Framework for Compressive Imaging

    Directory of Open Access Journals (Sweden)

    Yang Chen

    2014-01-01

    Full Text Available A novel region-based image-fusion framework for compressive imaging (CI and its implementation scheme are proposed. Unlike previous works on conventional image fusion, we consider both compression capability on sensor side and intelligent understanding of the image contents in the image fusion. Firstly, the compressed sensing theory and normalized cut theory are introduced. Then region-based image-fusion framework for compressive imaging is proposed and its corresponding fusion scheme is constructed. Experiment results demonstrate that the proposed scheme delivers superior performance over traditional compressive image-fusion schemes in terms of both object metrics and visual quality.

  9. Superior Mesenteric Artery Syndrome: An Infrequent Complication of Scoliosis Surgery

    Directory of Open Access Journals (Sweden)

    Metin Keskin

    2014-01-01

    Full Text Available Superior mesenteric artery syndrome is a rare condition that causes a proximal small intestinal obstruction due to contraction of the angle between the superior mesenteric artery and the aorta. Scoliosis surgery is one of the 15 reasons for superior mesenteric artery syndrome, which can present with acute or chronic manifestations. Although conservative treatment is usually possible, surgical treatment is required in certain cases that cannot be treated using conservative methods. In this paper, we describe a patient who developed superior mesenteric artery syndrome after scoliosis surgery and was treated with duodenojejunostomy due to failure and complications of conservative treatment.

  10. Superior Vena Cava Thrombosis in a Case of Lung Adenocarcinoma

    Directory of Open Access Journals (Sweden)

    Santanu Ghosh

    2013-01-01

    Full Text Available Superior vena cava syndrome is a common presentation of bronchogenic carcinoma. The mechanism of obstruction is by compression of superior vena cava by the bronchogenic tumor itself or enlarged mediastinal lymph nodes. However obstruction due to intravascular thrombosis is extremely uncommon. Here, we report a rare case of a 65-year-old male smoker who presented with superior vena cava syndrome and bilateral pleural and pericardial effusion with thrombotic occlusion of the superior vena cava in adenocarcinoma of the lung. He was given chemotherapy with carboplatin and gemcitabine with anticoagulant therapy.

  11. [Catheter in the superior vena cava for hemodialysis as a last resort in superior hemithorax].

    Science.gov (United States)

    Restrepo Valencia, C A; Buritica Barragán, C M; Arango, A

    2010-01-01

    We report four patients with chronic kidney disease undergoing haemodialysis therapy, which had exhausted conventional venous access (internal jugular, subclavian) and non-conventional access (axillary, innominate) in the upper hemithorax for haemodialysis. This was primarily due to thrombosis of these veins caused by previous catheterisation. These patients did not qualify for peritoneal dialysis. Using the technique recommended by Archundia et al., 4 indwelling catheters were implanted directly in the superior vena cava in each of the patients with subsequent subcutaneous tunneling. The catheters operated correctly and are currently permeable after being used for an average of 19 months.

  12. Correspondence Differential Ghost Imaging

    CERN Document Server

    Li, Ming-Fei; Luo, Kai-Hong; Wu, Ling-An; Fan, Heng

    2013-01-01

    Experimental data with digital masks and a theoretical analysis are presented for a nonlocal imaging scheme that we name correspondence differential ghost imaging (CDGI). It is shown that by conditional averaging of the information from the reference detector but with the negative signals inverted, the quality of the reconstructed images is, in general, superior to all other ghost imaging (GI) methods to date. The advantages of both differential GI and correspondence GI are combined, plus less data and shorter computation time are required to obtain equivalent quality images under the same conditions. This CDGI method offers a general approach applicable to all GI techniques, especially when objects with continuous gray tones are involved.

  13. Results from a geophysical investigation of Lake Superior's ring structures

    Science.gov (United States)

    Wattrus, N. J.; Gustafson, D.

    2010-12-01

    Ring shaped depressions are widely developed on the lake floor of Lake Superior. They have not been widely reported elsewhere. The rings are typically between 200 and 300 m across and up to 5 m deep. The width of the depression ranges between 10 to 30 m. They often occur in closely spaced groups or networks but can also occur as isolated features. Several mechanisms have been proposed to explain the formation of these features; they include syneresis of the fine-grained lake floor sediments, polygonal faulting and dewatering of the lake floor sediments. High resolution bathymetric surveying with a multibeam sonar has revealed that they are comprised of pockmarks arranged in irregular polygonal patterns. Sidescan sonar images of the pockmarks often exhibit increased backscatter about the pock which could be interpreted as evidence of a lag-surface. High-resolution CHIRP sub-bottom profiling across the pocks occasionally reveal chimney-like structures below the lake floor pock. This evidence suggests that the rings were produced by the expulsion of fluid from the lake floor. This appears to have been a basin-wide event. The timing, duration and origin of this are not well known. Neither is the structure of the subsurface plumbing below these features. Here we present results from a geophysical survey conducted in northwestern Lake Superior off the western coast of Isle Royale where both isolated and grouped lake floor rings are well developed. The objectives of the survey were to define the geometry of the sub-surface plumbing below the rings and to possibly gain some insight into how these systems develop. The data collected included two high-resolution pseudo-3D single-channel seismic reflection datasets, one acquired with a small airgun and a second acquired with a CHIRP profiler. Multibeam and sidescan sonar data were also acquired as part of the survey. A 9 m piston core was collected in close proximity to a ring feature. This is used to determine the physical

  14. A Novel Method for Intraoral Access to the Superior Head of the Human Lateral Pterygoid Muscle

    Directory of Open Access Journals (Sweden)

    Aleli Tôrres Oliveira

    2014-01-01

    Full Text Available Background. The uncoordinated activity of the superior and inferior parts of the lateral pterygoid muscle (LPM has been suggested to be one of the causes of temporomandibular joint (TMJ disc displacement. A therapy for this muscle disorder is the injection of botulinum toxin (BTX, of the LPM. However, there is a potential risk of side effects with the injection guide methods currently available. In addition, they do not permit appropriate differentiation between the two bellies of the muscle. Herein, a novel method is presented to provide intraoral access to the superior head of the human LPM with maximal control and minimal hazards. Methods. Computational tomography along with digital imaging software programs and rapid prototyping techniques were used to create a rapid prototyped guide to orient BTX injections in the superior LPM. Results. The method proved to be feasible and reliable. Furthermore, when tested in one volunteer it allowed precise access to the upper head of LPM, without producing side effects. Conclusions. The prototyped guide presented in this paper is a novel tool that provides intraoral access to the superior head of the LPM. Further studies will be necessary to test the efficacy and validate this method in a larger cohort of subjects.

  15. Interventional treatment for symptomatic acute-subacute portal and superior mesenteric vein thrombosis

    Institute of Scientific and Technical Information of China (English)

    Feng-Yong Liu; Mao-Qiang Wang; Qing-Sheng Fan; Feng Duan; Zhi-Jun Wang; Peng Song

    2009-01-01

    AIM: To summarize our methods and experience with interventional treatment for symptomatic acute-subacute portal vein and superior mesenteric vein thrombosis (PV-SMV) thrombosis. METHODS: Forty-six patients (30 males, 16 females,aged 17-68 years) with symptomatic acute-subacute portal and superior mesenteric vein thrombosis were accurately diagnosed with Doppler ultrasound scans, computed tomography and magnetic resonance imaging.They were treated with interventional therapy, including direct thrombolysis (26 cases through a transjugular intrahepatic portosystemic shunt; 6 through percutaneous transhepatic portal vein cannulation) and indirect thrombolysis (10 through the femoral artery to superior mesenteric artery catheterization; 4 through the radial artery to superior mesenteric artery catheterization).RESULTS: The blood reperfusion of PV-SMV was achieved completely or partially in 34 patients 3-13 d after thrombolysis. In 11 patients there was no PV-SMV blood reperfusion but the number of collateral vessels increased significantly. Symptoms in these 45 patients were improved dramatically without severe operational complications. In 1 patient, the thrombi did not respond to the interventional treatment and resulted in intestinal necrosis, which required surgical treatment.In 3 patients with interventional treatment, thrombi re-formed 1, 3 and 4 mo after treatment. In these 3 patients, indirect PV-SMV thrombolysis was performed again and was successful.CONCLUSION: Interventional treatment, including direct or indirect PV-SMV thrombolysis, is a safe and effective method for patients with symptomatic acutesubacute PV-SMV thrombosis.

  16. Fatal pericardial tamponade after superior vena cava stenting.

    NARCIS (Netherlands)

    Ploegmakers, M.J.M.; Rutten, M.J.C.M.

    2009-01-01

    We discuss a fatal complication of percutaneous superior vena cava (SVC) self-expandable stent placement in a patient with superior vena cava syndrome (SVCS). The SVCS was caused by a malignant mediastinal mass with total occlusion of the SVC. Twenty-four hours after the procedure, the patient died

  17. 33 CFR 117.495 - Superior Oil Canal.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Superior Oil Canal. 117.495 Section 117.495 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Louisiana § 117.495 Superior Oil Canal. The draw of the S82 bridge, mile 6.3, in Cameron...

  18. [Superior vena cava syndrome--surgical solution--case report].

    Science.gov (United States)

    Galie, N; Vasile, R; Savu, C; Petreanu, C; Grigorie, V; Tabacu, E

    2010-01-01

    The patient of 52-year-old smoker was admitted in emergency with headaches, dyspnea, oedema and cyanosis of the cephalic extremity and of the superior members. This signs and symptoms suggest a superior vena cava sindrom. Thoracic CT scan shows the thrombosis of the superior vena cava and a tumor localized in the Bariety's Lodge of about 30/40 mm witch is around the right lateral wall of the traheea.This tumor is also tangent to the superior the superior vena cava. The patient was operated by total median sternotomy. By this approach we performed a complete excision of the mediastinal tumor mass. After that we effected a longitudinal cavotomy, we took out the endoluminal clot and we sutured the superior vena cava. The histological diagnosis of the mediastinal tumor was adenocarcinoma tubular-papillary moderately differentiated. The evolution post operative period was favorable the superior vena cava sindrom was a complet remission. The thoracic CT scan control after 9 months later didn't show a local relapse and blood flow was normally throw the superior vena cava.

  19. Fatal pericardial tamponade after superior vena cava stenting.

    NARCIS (Netherlands)

    Ploegmakers, M.J.M.; Rutten, M.J.C.M.

    2009-01-01

    We discuss a fatal complication of percutaneous superior vena cava (SVC) self-expandable stent placement in a patient with superior vena cava syndrome (SVCS). The SVCS was caused by a malignant mediastinal mass with total occlusion of the SVC. Twenty-four hours after the procedure, the patient died

  20. The superior transvelar approach to the fourth ventricle and brainstem.

    Science.gov (United States)

    Ezer, Haim; Banerjee, Anirban Deep; Bollam, Papireddy; Guthikonda, Bharat; Nanda, Anil

    2012-06-01

    Objective The superior transvelar approach is used to access pathologies located in the fourth ventricle and brainstem. The surgical path is below the venous structures, through the superior medullary velum. Following splitting the tentorial edge, near the tentorial apex, the superior medullary velum is split in the cerebello-mesencephalic fissure. Using the supracerebellar infratentorial, transtentorial or parietal interhemispheric routes, the superior medullary velum is approached. Splitting this velum provides a detailed view of the fourth ventricle and its floor. Materials and Methods A total of 10 formalin-fixed specimens were dissected in a stepwise manner to simulate the superior transvelar approach to the fourth ventricle. The exposure gained the distance from the craniotomy site and the ease of access was assessed for each of the routes. We also present an illustrative case, operated by the senior author (AN). Results The superior transvelar approach provides access to the entire length of the fourth ventricle floor, from the aqueduct to the obex, when using the parietal interhemispheric route. In addition, this approach provides access to the entire width of the floor of the fourth ventricle; however, this requires retracting the superior cerebellar peduncle. Using the supracerebellar infratentorial route gives a limited exposure of the superior part of the fourth ventricle. The occipital interhemispheric route is a compromise between these two. Conclusion The superior transvelar approach to the fourth ventricle provides a route for approaching the fourth ventricle from above. This approach does not require opening the posterior fossa in the traditional way, and provides a reasonable alternative for accessing the superior fourth ventricle.

  1. Data fusion in X-ray computed tomography using a superiorization approach.

    Science.gov (United States)

    Schrapp, Michael J; Herman, Gabor T

    2014-05-01

    X-ray computed tomography (CT) is an important and widespread inspection technique in industrial non-destructive testing. However, large-sized and heavily absorbing objects cause artifacts due to either the lack of penetration of the specimen in specific directions or by having data from only a limited angular range of views. In such cases, valuable information about the specimen is not revealed by the CT measurements alone. Further imaging modalities, such as optical scanning and ultrasonic testing, are able to provide data (such as an edge map) that are complementary to the CT acquisition. In this paper, a superiorization approach (a newly developed method for constrained optimization) is used to incorporate the complementary data into the CT reconstruction; this allows precise localization of edges that are not resolvable from the CT data by itself. Superiorization, as presented in this paper, exploits the fact that the simultaneous algebraic reconstruction technique (SART), often used for CT reconstruction, is resilient to perturbations; i.e., it can be modified to produce an output that is as consistent with the CT measurements as the output of unmodified SART, but is more consistent with the complementary data. The application of this superiorized SART method to measured data of a turbine blade demonstrates a clear improvement in the quality of the reconstructed image.

  2. IMAGES, IMAGES, IMAGES

    Energy Technology Data Exchange (ETDEWEB)

    Marcus, A.

    1980-07-01

    The role of images of information (charts, diagrams, maps, and symbols) for effective presentation of facts and concepts is expanding dramatically because of advances in computer graphics technology, increasingly hetero-lingual, hetero-cultural world target populations of information providers, the urgent need to convey more efficiently vast amounts of information, the broadening population of (non-expert) computer users, the decrease of available time for reading texts and for decision making, and the general level of literacy. A coalition of visual performance experts, human engineering specialists, computer scientists, and graphic designers/artists is required to resolve human factors aspects of images of information. The need for, nature of, and benefits of interdisciplinary effort are discussed. The results of an interdisciplinary collaboration are demonstrated in a product for visualizing complex information about global energy interdependence. An invited panel will respond to the presentation.

  3. Different Image Segmentation Techniques for Dental Image Extraction

    Directory of Open Access Journals (Sweden)

    R. Bala Subramanyam

    2014-07-01

    Full Text Available Image segmentation is the process of partitioning a digital image into multiple segments and often used to locate objects and boundaries (lines, curves etc.. In this paper, we have proposed image segmentation techniques: Region based, Texture based, Edge based. These techniques have been implemented on dental radiographs and gained good results compare to conventional technique known as Thresholding based technique. The quantitative results show the superiority of the image segmentation technique over three proposed techniques and conventional technique.

  4. Síndrome de Deiscência de Canal Semicircular Superior Superior Canal Dehiscence Syndrome

    Directory of Open Access Journals (Sweden)

    Suzane da Cunha Ferreira

    2006-06-01

    Full Text Available A Síndrome de Deiscência de Canal Semicircular Superior (SDCSS, primeiramente descrita em 1998 por Minor et al., caracteriza-se por vertigem associada à presença de nistagmo, relacionados à exposição a estímulos sonoros intensos ou a modificações de pressão dentro da orelha média ou intracraniana. Disacusia, em sua maioria de padrão condutivo à audiometria tonal, também pode estar presente. Nesta revisão da literatura objetivou-se abordar a SDCSS, com seus principais sinais e sintomas, achados diagnósticos e tratamento, assim como enfatizar a importância de sua inclusão dentre as causas de vertigem, visto tratar-se de acometimento ainda pouco conhecido até mesmo entre especialistas. O diagnóstico correto, além de possibilitar seu tratamento, impede que abordagens diagnósticas e terapêuticas inapropriadas sejam realizadas.The Superior Canal Dehiscence Syndrome (SCDS was first reported by Minor at. Al. (1998, and has been characterized by vertigo and vertical-torsional eye movements related to loud sounds or stimuli that change middle ear or intracranial pressure. Hearing loss, for the most part with conductive patterns on audiometry, may be present in this syndrome. We performed a literature survey in order to to present symptoms, signs, diagnostic and therapeutic approaches to the SCDS, also aiming at stressing the great importance of including this syndrome among the tractable cause of vertigo. We should emphasize that this is a recent issue, still unknown by some specialists. The Correct SCDS diagnosis, besides enabling patient treatment, precludes misdiagnosis and inadequate therapeutic approaches.

  5. Morphological study of surgical approach by superior temporal sulcus-temporal horn of lateral ventricle approach using volume rendering.

    Science.gov (United States)

    Sun, Wei; Jia, Linpei; Dong, Yidian; Zhao, Hang; Liu, Haoyuan; Yang, Kerong; Li, Youqiong

    2014-03-01

    In this research, we acquired the length of the superior temporal sulcus, the shortest distance from the superior temporal sulcus to the temporal horn of the lateral ventricle, and the approach angle between the median sagittal plane and the shortest segment from the superior temporal sulcus to the temporal horn of the lateral ventricle measuring 98 specimens by magnetic resonance imaging volume rendering. At the same time, we preliminarily oriented the point of the superior temporal sulcus, which is closest to the temporal horn of the lateral ventricle, aimed at finding out the best entrance point of surgical approach through the superior temporal sulcus to the temporal horn of the lateral ventricle and reducing the damage to optic radiation as well as other nerve fibers during the operation. The results indicate that the point at the front side 3/5 of the superior temporal sulcus may be the ideal surgical approach entrance point, and there is no difference between 2 cerebral hemispheres (P < 0.05).

  6. Clinical results of arthroscopic superior capsule reconstruction for irreparable rotator cuff tears.

    Science.gov (United States)

    Mihata, Teruhisa; Lee, Thay Q; Watanabe, Chisato; Fukunishi, Kunimoto; Ohue, Mutsumi; Tsujimura, Tomoyuki; Kinoshita, Mitsuo

    2013-03-01

    The objective of this study was to investigate the clinical outcome and radiographic findings after arthroscopic superior capsule reconstruction (ASCR) for symptomatic irreparable rotator cuff tears. From 2007 to 2009, 24 shoulders in 23 consecutive patients (mean, 65.1 years) with irreparable rotator cuff tears (11 large, 13 massive) underwent ASCR using fascia lata. We used suture anchors to attach the graft medially to the glenoid superior tubercle and laterally to the greater tuberosity. We added side-to-side sutures between the graft and infraspinatus tendon and between the graft and residual anterior supraspinatus/subscapularis tendon to improve force coupling. Physical examination, radiography, and magnetic resonance imaging (MRI) were performed before surgery; at 3, 6, and 12 months after surgery; and yearly thereafter. Average follow-up was 34.1 months (24 to 51 months) after surgery. Mean active elevation increased significantly from 84° to 148° (P Arthroscopy Association of North America. All rights reserved.

  7. Acquired Brown Syndrome Treated With Traction of Superior Oblique Tendon.

    Science.gov (United States)

    Shin, Kwang Hoon; Paik, Hae Jung; Chi, Mijung

    2016-03-01

    Brown syndrome is a rare strabismic disease characterized by a limited elevation in adduction of the eye. The lengthening/weakening of superior oblique muscle is the main way of surgical intervention for this disease. A 7-year-old boy was diagnosed as having acquired Brown syndrome in his right eye after injury in his face. We experienced successful release of this Brown syndrome through mere pulling outward of superior oblique tendon during surgical exploration. We briefly discuss why this manipulation of superior oblique tendon that we performed was successful.

  8. Right superior vena cava draining into the left atrium

    Energy Technology Data Exchange (ETDEWEB)

    Calcagni, Giulio; Sidi, Daniel; Bonnet, Damien [University Rene Descartes-Paris 5, Department of Paediatric Cardiology, Hopital Necker-Enfants Malades, Paris (France); Batisse, Alain [Institut de Puericulture et de Perinatalogie, Paris (France); Vouhe, Pascal [University Rene Descartes-Paris 5, Department of Paediatric Cardiac Surgery, Hopital Necker-Enfants Malades, Paris (France); Ou, Phalla [University Rene Descartes-Paris 5, Department of Paediatric Cardiology, Hopital Necker-Enfants Malades, Paris (France); University Rene Descartes-Paris 5, Department of Pediatric Radiology, Hopital Necker-Enfants Malades, Paris (France)

    2008-08-15

    The right superior vena cava draining into the left atrium is a rare malformation causing cyanosis and clubbing in patients in whom no other signs of congenital heart defect are present. Diagnosis may be difficult as cyanosis may be mild and the anomaly is not always easily detectable by echocardiography. For this reason we report a 13-month-old male in whom we confirmed the clinical and echocardiographic suspicion of anomalous drainage of the right superior vena cava using multidetector CT. This allowed successful surgical reconnection of the right superior vena cava to the right atrium. (orig.)

  9. Noise management to achieve superiority in quantum information systems

    Science.gov (United States)

    Nemoto, Kae; Devitt, Simon; Munro, William J.

    2017-06-01

    Quantum information systems are expected to exhibit superiority compared with their classical counterparts. This superiority arises from the quantum coherences present in these quantum systems, which are obviously absent in classical ones. To exploit such quantum coherences, it is essential to control the phase information in the quantum state. The phase is analogue in nature, rather than binary. This makes quantum information technology fundamentally different from our classical digital information technology. In this paper, we analyse error sources and illustrate how these errors must be managed for the system to achieve the required fidelity and a quantum superiority. This article is part of the themed issue 'Quantum technology for the 21st century'.

  10. Hypoxia Caused by Persistent Left Superior Vena Cava Connecting to the Left Atrium A Rare Clinical Entity

    Science.gov (United States)

    Freeman, Andrew M.; Fenster, Brett E.; Weinberger, Howard D.; Buckner, J. Kern; Lynch, David

    2012-01-01

    We relate the case of a 40-year-old man with a history of premature birth and dextroposition of the heart who presented for an evaluation of persistent hypoxia. An unrevealing pulmonary evaluation and agitated-saline echocardiogram led to cardiac magnetic resonance imaging. This revealed a very unusual finding: a persistent left superior vena cava with insertion into the left atrium and a small connecting vein between the right and left superior venae cavae. The implications, embryology, and pathogenesis of this rare condition are discussed. PMID:23109762

  11. Cardiac imaging in adults

    Energy Technology Data Exchange (ETDEWEB)

    Jaffe, C.C.

    1987-01-01

    This book approaches adult cardiac disease from the correlative imaging perspective. It includes chest X-rays and angiographs, 2-dimensional echocardiograms with explanatory diagrams for clarity, plus details on digital radiology, nuclear medicine techniques, CT and MRI. It also covers the normal heart, valvular heart disease, myocardial disease, pericardial disease, bacterial endocarditis, aortic aneurysm, cardiac tumors, and congenital heart disease of the adult. It points out those aspects where one imaging technique has significant superiority.

  12. 2010 Great Lakes Restoration Initiative Bathymetric Lidar: Lake Superior

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The data contained in this file contain hydrographic and topographic data collected by the Fugro LADS Mk II system along the Lake Superior coast of Minnessota,...

  13. 28 CFR 2.60 - Superior program achievement.

    Science.gov (United States)

    2010-07-01

    ... OF PRISONERS, YOUTH OFFENDERS, AND JUVENILE DELINQUENTS United States Code Prisoners and Parolees § 2... or a case with both superior program achievement and minor disciplinary infraction(s)). Advancements...

  14. Coronary artery bypass and superior vena cava syndrome.

    Science.gov (United States)

    Thomas, T V; Masrani, K; Thomas, J L

    1999-01-01

    Superior vena cava syndrome is the obstruction of the superior vena cava or its main tributaries by benign or malignant lesions. The syndrome causes edema and engorgement of the vessels on the face, neck, and arms, nonproductive cough, and dyspnea. We discuss the case of a 48-year-old obese diabetic woman who was admitted with unstable angina. She had previously been diagnosed with superior vena cava syndrome. Urgent coronary artery bypass grafting was necessary Although thousands of coronary artery bypasses are performed every year, there are not many reports on patients with superior vena cava syndrome who successfully undergo cardiopulmonary bypass and coronary artery grafting with an internal mammary artery as the conduit. The results of the case and alternative recommended methods are discussed.

  15. Total variation superiorization in dual-energy CT reconstruction for proton therapy treatment planning

    Science.gov (United States)

    Zhu, Jiahua; Penfold, Scott

    2017-04-01

    Proton therapy is a precise form of radiotherapy in which the range of an energetic beam of protons within a patient must be accurately known. The current approach based on single-energy computed tomography (SECT) can lead to uncertainties in the proton range of approximately 3%. This range of uncertainty may lead to under-dosing of the tumour or over-dosing of healthy tissues. Dual-energy CT (DECT) theoretically has the potential to reduce these range uncertainties by quantifying electron density and the effective atomic number. In practice, however, DECT images reconstructed with filtered backprojection (FBP) tend to suffer from high levels of noise. The objective of the current work was to examine the effect of total variation superiorization (TVS) on proton therapy planning accuracy when compared with FBP. A virtual CT scanner was created with the Monte Carlo toolkit Geant4. Tomographic images were reconstructed with FBP and TVS combined with diagonally relaxed orthogonal projections (TVS-DROP). A total variation minimization (TVM) filter was also applied to the image reconstructed with FBP (FBP-TVM). Quantitative accuracy and variance of proton relative stopping power (RSP) derived from each image set was assessed. Mean RSPs were comparable with each image; however, the standard deviation of pixel values with TVS-DROP was reduced by a factor of 0.44 compared with the FBP image and a factor of 0.66 when compared with the FBP-TVM image. Proton doses calculated with the TVS-DROP image set were also better able to predict a reference dose distribution when compared with the FBP and FBP-TVM image sets. The study demonstrated the potential advantages of TVS-DROP as an image reconstruction method for DECT applied to proton therapy treatment planning.

  16. Superior Memorizers Employ Different Neural Networks for Encoding and Recall

    Directory of Open Access Journals (Sweden)

    Johannes eMallow

    2015-09-01

    Full Text Available Superior memorizers often employ the method of loci (MoL to memorize large amounts of information. The method of loci, known since ancient times, relies on a complex process where information to be memorized is bound to landmarks along mental routes in a previously memorized environment. However, fMRI data on groups of trained superior memorizer are rare. Based on the memorizing strategy reported by superior memorizers we developed a scheme of the processes successively employed during memorizing and recalling digits and relate these to brain activation that is specific for the encoding and recall period. In the examined superior memorizers several regions, suggested to be involved in mental navigation and digit-to-word processing, were specifically activated during encoding: bilateral early visual cortex, retrosplenial cortex, left parahippocampus, left visual cortex, and left superior parietal cortex. Although the scheme suggests that some steps during encoding and recall seem to be analog, none of the encoding areas were specifically activated during the recall. Instead, we found strong activation in left anterior superior temporal gyrus, which we relate to recalling the sequential order of the digits, and right motor cortex that may be related to reciting the digits.

  17. Differential diagnosis of cervical radiculopathy and superior pulmonary sulcus tumor

    Institute of Scientific and Technical Information of China (English)

    GU Rui; KANG Ming-yang; GAO Zhong-li; ZHAO Jian-wu; WANG Jin-cheng

    2012-01-01

    Background The result would be disastrous if the superior pulmonary sulcus tumor (Pancoast tumor) was misdiagnosed as degenerative cervical spine diseases.The aim of this study was to investigate the differential diagnosis methods of cervical radiculopathy and superior pulmonary sulcus tumor.Methods Clinical manifestations,physical,and radiological findings of 10 patients,whose main complaints were radiating shoulder and arm pain and later were diagnosed with superior pulmonary sulcus tumor,were reviewed and compared with those of cervical radiculopathy.Results Superior pulmonary sulcus tumor patients have shorter mean history and fewer complaints of neck pain or limitation of neck movement.Physical examination showed almost normal cervical spine range of motion.Spurling's neck compression test was negative in all patients.Anteroposterior cervical radiographs showed the lack of pulmonary air at the top of the affected lung in all cases and first rib encroachment in one case.The diagnosis of superior pulmonary sulcus tumor can be further confirmed by CT and MRI.Conclusions By the method of combination of history,physical examination,and radiological findings,superior pulmonary sulcus tumor can be efficiently differentiated from cervical radiculopathy.Normal motion range of the cervical spine,negative Spurling's neck compression test,and the lack of pulmonary air at the top of the affected lung in anteroposterior cervical radiographs should be considerad as indications for further chest radiograph examinations.

  18. Unusual Complication of Superior Mesenteric Artery Syndrome: Spontaneous Upper Gastrointestinal Bleeding with Hypovolemic Shock

    Directory of Open Access Journals (Sweden)

    Kai-Hsiung Ko

    2009-01-01

    Full Text Available Superior mesenteric artery (SMA syndrome is an unusual form of duodenal obstruction. Complications of SMA syndrome may sometimes develop and are usually associated with marked gastric dilatation, although most complications can be corrected by supportive treatment. In this article, we report a case of severe SMA syndrome with hypovolemic shock in a 24-year-old man. Multidetector-row computed tomography with reconstructed images was performed to establish the diagnosis. Spontaneous gastrointestinal bleeding is an extremely uncommon complication of SMA syndrome, and emergent surgical intervention was unavoidable in our patient. To our knowledge, no other such case has been reported in the English-language literature.

  19. Aneurysm of the Superior Posterior Pancreatic-Duodenal Artery Presenting with Recurrent Syncopes

    Directory of Open Access Journals (Sweden)

    I.A.J. van Doesburg

    2009-08-01

    Full Text Available We present a 61-year-old woman with hypovolemic shock due to a ruptured aneurysm of the superior posterior pancreatic-duodenal artery in whom recurrent syncopes were the first presenting sign of pancreatic-duodenal artery aneurysm (PDAA. PDAA is a rare but life-threatening condition. The widely varying symptomatology may lead to a delay in diagnosis and treatment. Patients with atypical symptoms, such as vague abdominal pain, recurrent dizziness or syncope, may actually suffer from a sentinel bleeding of the vascular malformation. Radiological imaging, especially selective angiography, may provide a diagnostic as well as a therapeutic tool in these patients.

  20. Small bowel volvulus in pregnancy with associated superior mesenteric artery occlusion.

    Science.gov (United States)

    Esterson, Yonah B; Villani, Robert; Dela Cruz, Ronald A; Friedman, Barak; Grimaldi, Gregory M

    Here we report the case of a pregnant 28-year-old who presented with acute upper abdominal pain. CT demonstrated midgut volvulus with short segment occlusion of the superior mesenteric artery (SMA). Emergent detorsion of the small bowel was performed, at which time underlying intestinal malrotation was discovered. Following detorsion, the SMA had a bounding pulse and did not require thrombectomy or revascularization. Fewer than 25 cases of midgut volvulus during pregnancy have been reported over the past 20years. To our knowledge, this is the first report of maternal midgut volvulus in which imaging captures the resultant occlusion of the SMA.

  1. Percutaneous augmentation of the superior pubic ramus with polymethyl methacrylate: treatment of acute traumatic and chronic insufficiency fractures

    Energy Technology Data Exchange (ETDEWEB)

    Beall, Douglas P. [University of Oklahoma, Clinical Radiology of Oklahoma, Oklahoma City, OK (United States); D' Souza, Sharon L. [University of Oklahoma, Oklahoma City, OK (United States); Costello, Richard F.; Stapp, Annette M. [Clinical Radiology of Oklahoma, Edmond, OK (United States); Prater, Scott D. [University of Oklahoma College of Medicine, Edmond, OK (United States); Van Zandt, Bryan L. [University of Oklahoma College of Medicine, Oklahoma City, OK (United States); Martin, Hal D. [Oklahoma Sports Science and Orthopaedics, Oklahoma City, OK (United States)

    2007-10-15

    The injection of polymethylmethacrylate (PMMA) is a minimally invasive image-guided procedure that is typically used to treat vertebral body fractures due to osteoporosis or neoplastic involvement. The injection of PMMA into various other locations including the sacrum, acetabulum, pedicles, femur and tibia has been reported previously, and these procedures have, overall, been highly effective at alleviating pain and discomfort. Although the injection of PMMA into the vertebral body is a very common procedure that has been performed for over 2 decades for the percutaneous treatment of vertebral body fractures, the percutaneous injection of PMMA has not been reported in the English literature as treatment for superior pubic ramus fractures. We report the percutaneous treatment of an acute superior pubic ramus fracture and of a chronic insufficiency fracture of the superior pubic ramus using a parasymphyseal approach to access the region of injury. (orig.)

  2. Vein of foramen caecum: imaging findings.

    Science.gov (United States)

    Tutar, Onur; Kandemirli, Sedat Giray; Yildirim, Duzgun; Memis, Emine Sebnem; Bakan, Selim

    2016-07-01

    Vein of foramen caecum has been classically described as a vein that connects nasal mucosa to the superior sagittal sinus in classic anatomy textbooks. However, its existence is controversial in literature. Herein, we demonstrated computed tomography and contrast enhanced magnetic resonance imaging findings of a tubular vascular structure extending to nasal mucosa and superior sagittal sinus.

  3. Development of a superior frontal-intraparietal network for visuo-spatial working memory.

    Science.gov (United States)

    Klingberg, Torkel

    2006-01-01

    Working memory capacity increases throughout childhood and adolescence, which is important for the development of a wide range of cognitive abilities, including complex reasoning. The spatial-span task, in which subjects retain information about the order and position of a number of objects, is a sensitive task to measure development of spatial working memory. This review considers results from previous neuroimaging studies investigating the neural correlates of this development. Older children and adolescents, with higher capacity, have been found to have higher brain activity in the intraparietal cortex and in the posterior part of the superior frontal sulcus, during the performance of working memory tasks. The structural maturation of white matter has been investigated by diffusion tensor magnetic resonance imaging (DTI). This has revealed several regions in the frontal lobes in which white matter maturation is correlated with the development of working memory. Among these is a superior fronto-parietal white matter region, located close to the grey matter regions that are implicated in the development of working memory. Furthermore, the degree of white matter maturation is positively correlated with the degree of cortical activation in the frontal and parietal regions. This suggests that during childhood and adolescence, there is development of networks related to specific cognitive functions, such as visuo-spatial working memory. These networks not only consist of cortical areas but also the white matter tracts connecting them. For visuo-spatial working memory, this network could consist of the superior frontal and intraparietal cortex.

  4. Neural correlates associated with superior tactile symmetry perception in the early blind.

    Science.gov (United States)

    Bauer, Corinna; Yazzolino, Lindsay; Hirsch, Gabriella; Cattaneo, Zaira; Vecchi, Tomaso; Merabet, Lotfi B

    2015-02-01

    Symmetry is an organizational principle that is ubiquitous throughout the visual world. However, this property can also be detected through non-visual modalities such as touch. The role of prior visual experience on detecting tactile patterns containing symmetry remains unclear. We compared the behavioral performance of early blind and sighted (blindfolded) controls on a tactile symmetry detection task. The tactile patterns used were similar in design and complexity as in previous visual perceptual studies. The neural correlates associated with this behavioral task were identified with functional magnetic resonance imaging (fMRI). In line with growing evidence demonstrating enhanced tactile processing abilities in the blind, we found that early blind individuals showed significantly superior performance in detecting tactile symmetric patterns compared to sighted controls. Furthermore, comparing patterns of activation between these two groups identified common areas of activation (e.g. superior parietal cortex) but key differences also emerged. In particular, tactile symmetry detection in the early blind was also associated with activation that included peri-calcarine cortex, lateral occipital (LO), and middle temporal (MT) cortex, as well as inferior temporal and fusiform cortex. These results contribute to the growing evidence supporting superior behavioral abilities in the blind, and the neural correlates associated with crossmodal neuroplasticity following visual deprivation.

  5. La educación superior como eje del desarrollo

    Directory of Open Access Journals (Sweden)

    Benjamín Afanador Vargas

    2003-11-01

    Full Text Available Este documento analiza cómo ha sido la interacción entre la política educativa y las estrategiasde desarrollo en Colombia, a lo largo del siglo XX. Se presenta una revisión del estadoactual de la educación en Colombia, tanto a nivel de educación básica y media, como de laeducación superior. Para ello se toman tres criterios básicos que son la cobertura, la calidady la equidad en el acceso a la educación. Para el caso de la educación superior, se comparala oferta de cupos con la demanda existente, se clasifican los distintos segmentos en que sedivide la educación superior y se hace una breve reseña sobre el recurso humano con que secuenta en la educación superior colombiana. Así mismo, se expone una conceptualización delos retos que enfrenta la educación superior, sobretodo para lograr una cohesión de la sociedad,evitando que algunos de sus integrantes sean excluidos y permitiendo que todos losestamentos de la sociedad puedan compartir los mismos ideales y los consideren asequibles.Finalmente, se presentan unas conclusiones que se derivan del estudio y se proponen algunasrecomendaciones de política .

  6. Management of type II superior labrum anterior posterior lesions: a review of the literature

    Directory of Open Access Journals (Sweden)

    Xinning Li

    2010-02-01

    Full Text Available Superior labrum anterior and posterior lesions were first described in 1985 by Andrews et al. and later classified into four types by Synder et al. The most prevalent is type II which is fraying of the superior glenoid labrum with detachment of the biceps anchor. Superior labrum anterior posterior (SLAP lesions can also be associated with other shoulder pathology. Both MRI and MRA can be utilized in making the diagnosis with the coronal images being the most sensitive. The mechanism of injury can be either repetitive stress or acute trauma with the superior labrum most vulnerable to injury during the late cocking phase of throwing. A combination of the modified dynamic labral shear and O’Brien test can be used clinically in making the diagnosis of SLAP lesion. However, the most sensitive and specific test used to diagnosis specifically a type II SLAP lesion is the Biceps Load Test II. The management of type II SLAP lesions is controversial and dependent on patient characteristics. In the young high demanding overhead athlete, repair of the type II lesion is recommended to prevent glenohumeral instability. In middle-aged patients (age 25-45, repair of the type II SLAP lesion with concomitant treatment of other shoulder pathology resulted in better functional outcomes and patient satisfaction. Furthermore, patients who had a distinct traumatic event resulting in the type II SLAP tear did better functionally than patients who did not have the traumatic event when the lesion was repaired. In the older patient population (age over 45 years, minimum intervention (debridement, biceps tenodesis/tenotomy to the type II SLAP lesion results in excellent patient satisfaction and outcomes.

  7. Design of a fifth generation air superiority fighter

    Science.gov (United States)

    Atique, Md. Saifuddin Ahmed; Barman, Shuvrodeb; Nafi, Asif Shahriar; Bellah, Masum; Salam, Md. Abdus

    2016-07-01

    Air Superiority Fighter is considered to be an effective dogfighter which is stealthy & highly maneuverable to surprise enemy along with improve survivability against the missile fire. This new generation fighter aircraft requires fantastic aerodynamics design, low wing loading (W/S), high thrust to weight ratio (T/W) with super cruise ability. Conceptual design is the first step to design an aircraft. In this paper conceptual design of an Air Superiority Fighter Aircraft is proposed to carry 1 crew member (pilot) that can fly at maximum Mach No of 2.3 covering a range of 1500 km with maximum ceiling of 61,000 ft. Payload capacity of this proposed aircraft is 6000 lb that covers two advanced missiles & one advanced gun. The Air Superiority Fighter Aircraft was designed to undertake all the following missions like: combat air petrol, air to air combat, maritime attack, close air support, suppression, destruction of enemy air defense and reconnaissance.

  8. Partial anomalous pulmonary venous connection to the superior vena cava.

    Science.gov (United States)

    Aramendi, José I; Rey, Estibaliz; Hamzeh, Gadah; Crespo, Alejandro; Luis, Maite; Voces, Roberto

    2011-04-01

    We describe the surgical technique of reimplantation of the right superior pulmonary vein into the left atrium in 2 patients with partial anomalous pulmonary venous connection to the superior vena cava without atrial septal defect. A right axillary minithoracotomy is done through the fourth intercostal space. The pulmonary vein is detached from its origin in the superior vena cava. This is sutured with 6-0 reabsorbable polydioxanone suture (Ethicon, Somerville, NJ). A lateral clamp is applied to the left atrium, and the pulmonary vein is reimplanted. The patient is extubated in the operating room. Neither cardiopulmonary bypass nor blood transfusion was required. It is simple, safe, and reproducible. Copyright © 2011 The Society of Thoracic Surgeons. Published by Elsevier Inc. All rights reserved.

  9. Anthropogenic climate change has altered primary productivity in Lake Superior

    Science.gov (United States)

    O'Beirne, M. D.; Werne, J. P.; Hecky, R. E.; Johnson, T. C.; Katsev, S.; Reavie, E. D.

    2017-06-01

    Anthropogenic climate change has the potential to alter many facets of Earth's freshwater resources, especially lacustrine ecosystems. The effects of anthropogenic changes in Lake Superior, which is Earth's largest freshwater lake by area, are not well documented (spatially or temporally) and predicted future states in response to climate change vary. Here we show that Lake Superior experienced a slow, steady increase in production throughout the Holocene using (paleo)productivity proxies in lacustrine sediments to reconstruct past changes in primary production. Furthermore, data from the last century indicate a rapid increase in primary production, which we attribute to increasing surface water temperatures and longer seasonal stratification related to longer ice-free periods in Lake Superior due to anthropogenic climate warming. These observations demonstrate that anthropogenic effects have become a prominent influence on one of Earth's largest, most pristine lacustrine ecosystems.

  10. Noise management to achieve superiority in quantum information systems.

    Science.gov (United States)

    Nemoto, Kae; Devitt, Simon; Munro, William J

    2017-08-06

    Quantum information systems are expected to exhibit superiority compared with their classical counterparts. This superiority arises from the quantum coherences present in these quantum systems, which are obviously absent in classical ones. To exploit such quantum coherences, it is essential to control the phase information in the quantum state. The phase is analogue in nature, rather than binary. This makes quantum information technology fundamentally different from our classical digital information technology. In this paper, we analyse error sources and illustrate how these errors must be managed for the system to achieve the required fidelity and a quantum superiority.This article is part of the themed issue 'Quantum technology for the 21st century'. © 2017 The Author(s).

  11. INFORMATION ASSURANCE - INTELLIGENCE - INFORMATION SUPERIORITY RELATIONSHIP WITHIN NATO OPERATIONS

    Directory of Open Access Journals (Sweden)

    Gheorghe BOARU, Ioan-Mihai ILIEŞ

    2011-01-01

    Full Text Available There is a tight relationship between information assurance, the intelligence cycle and information superiority within NATO operations. The intelligence cycle has a discrete architecture and provides on-time and relevant intelligence products to the joint force commanders and to other authorized users in a specifi c joint area of operations. The intelligence cycle must follow the evolution of the operation. A permanent intelligence estimate will be performed during the military decision making process and operations execution. Information superiority is one of the most powerful intelligence cycle achievements. and decisively infuences the success of NATO joint operations. Information superiority must be preserved and enhanced through information assurance. Information assurance is an information operation that must be planned by the military in charge of operation security or by non-military experts, executed by all personnel during the entire intelligence cycle life time and employed during the planning and execution of NATO joint operations.

  12. Status of the shortjaw cisco (Coregonus zenithicus) in Lake Superior

    Science.gov (United States)

    Hoff, Michael H.; Todd, Thomas N.

    2004-01-01

    The shortjaw cisco (Coregonus zenithicus) was historically found in Lakes Huron, Michigan, and Superior, but has been extirpated in Lakes Huron and Michigan apparently as the result of commercial overharvest. During 1999-2001, we conducted an assessment of shortjaw cisco abundance in five areas, spanning the U.S. waters of Lake Superior, and compared our results with the abundance measured at those areas in 1921-1922. The shortjaw cisco was found at four of the five areas sampled, but abundances were so low that they were not significantly different from zero. In the four areas where shortjaw ciscoes were found, abundance declined significantly by 99% from the 1920s to the present. To increase populations of this once economically and ecologically important species in Lake Superior, an interagency rehabilitation effort is needed. Population monitoring is recommended to assess population trends and to evaluate success of rehabilitation efforts.

  13. The postdiction superiority effect in metacomprehension of text.

    Science.gov (United States)

    Pierce, B H; Smith, S M

    2001-01-01

    Metacomprehension accuracy for texts was greater after, rather than before, answering test questions about the texts-a postdiction superiority effect. Although postdiction superiority was found across successive sets of test questions and across successive texts, there was no improvement in metacomprehension accuracy after participants had taken more tests. Neither prediction nor postdiction gamma correlations with test performance improved with successive tests. Although the results are consistent with retrieval hypotheses, they contradict predictions made by test knowledge hypotheses, which state that increasing knowledge of the nature of the tests should increase metacomprehension accuracy.

  14. SUPERIOR MESENTERIC ARTERY SYNDROME - AN UNUSUAL CAUSE OF DUODENAL OBSTRUCTION

    OpenAIRE

    Sahu SK, , , , , , ,; Singh PK; Ray J; Uniyal M; Sharma C; Sekhar C; Kapruwan H; Sachan PK

    2012-01-01

    Superior mesenteric artery (SMA) arising from aorta at the level of first lumbar vertebra usually takes an angular downward course from ventral surface of aorta. It is through this vascular angle that the 3rd part of duodenum passes at the level of 4th lumbar vertebra. Fat and lymphatics around SMA maintains the angle at 25° to 60° with a mean of 450 and provide protection against duodenal compression. In Superior Mesenteric Artery Syndrome, the SMA-aorta angle in narrowed down to 7° to 22° w...

  15. Síndrome de veia cava superior Superior vena cava syndrome

    Directory of Open Access Journals (Sweden)

    SAMUEL ZUÍNGLIO DE BIASI CORDEIRO

    2002-09-01

    Full Text Available A obstrução ao fluxo sanguíneo na VCS e suas manifestações clínicas têm hoje como causa principal o câncer de pulmão. A história relata que no século XVIII a sífilis e a tuberculose eram responsáveis por 40% dos casos conhecidos. O conhecimento das alterações hemodinâmicas compreendidas nesta síndrome assim como a apuração das técnicas de diagnóstico de imagem e de citopatologia permitem hoje que o médico possa tratar de seu paciente com mais segurança e conforto do que há 10 anos. A TC contrastada e a RM auxiliam no diagnóstico de localização da obstrução e técnicas mais antigas como a cavografia puderam ser abandonadas. O diagnóstico de obstrução da VCS e o estudo por Doppler realizado à beira do leito em muito contribuem para a realização de procedimentos de desobstrução como a angioplastia transluminal percutânea nos casos de trombose ou estenose do vaso. Também a utilização de próteses como PTFE é de importância fundamental na condução de casos de lesão traumática da VCS durante cirurgias para câncer pulmonar ou mediastinal. No campo da radioterapia, a técnica de fracionamento permite que altas doses de irradiação sejam administradas aos pacientes portadores de neoplasias malignas, com benefícios em 70% dos casos.Lung cancer is now the main cause of blood flow obstruction in the superior vena cava and of its clinical manifestations. History tells that in the 18th Century, syphilis and tuberculosis were responsible for 40% of the known cases. The knowledge of hemodynamic changes seen in this syndrome and the improvement of diagnostic and cytopathologic techniques allow for a safer and more comfortable treatment of the patient than 10 years ago. Contrast CT and MR added to the identification and location of the obstruction, and older techniques such as cavography could be abandoned. SVC obstruction diagnosis and Doppler studies carried out at the bed of the patient contribute to

  16. Human middle longitudinal fascicle: Segregation and behavioral-clinical implications of two distinct fiber connections linking temporal pole and superior temporal gyrus with the angular gyrus or superior parietal lobule using multi-tensor tractography

    Science.gov (United States)

    Makris, N.; Preti, M.G.; Wassermann, D.; Rathi, Y.; Papadimitriou, G. M.; Yergatian, C.; Dickerson, B. C.; Shenton, M. E.; Kubicki, M.

    2013-01-01

    The middle longitudinal fascicle (MdLF) is a major fiber connection running principally between the superior temporal gyrus and the parietal lobe, neocortical regions of great biological and clinical interest. Although one of the most prominent cerebral association fiber tracts it has only recently been discovered in humans. In this high angular resolution diffusion imaging (HARDI) MRI study, we delineated the two major fiber connections of the human MdLF, by examining morphology, topography, cortical connections, biophysical measures, volume and length in seventy-four brains. These two fiber connections course together through the dorsal temporal pole and the superior temporal gyrus maintaining a characteristic topographic relationship in the mediolateral and ventrodorsal dimensions. As these pathways course towards the parietal lobe, they split to form separate fiber pathways, one following a ventrolateral trajectory and connecting with the angular gyrus and the other following a dorsomedial route and connecting with the superior parietal lobule. Based on the functions of their cortical affiliations, we suggest that the superior temporal-angular connection of the MdLF, i.e., STG(MdLF)AG plays a role in language and attention, whereas the superior temporal-superior parietal connection of the MdLF, i.e., STG(MdLF)SPL is involved in visuospatial and integrative audiovisual functions. Furthermore, the MdLF may have clinical implications in neurodegenerative disorders such as primary progressive aphasia, frontotemporal dementia, posterior cortical atrophy, corticobulbar degeneration and Alzheimer’s disease as well as attention-deficit/hyperactivity disorder and schizophrenia. PMID:23686576

  17. Biological Motion Task Performance Predicts Superior Temporal Sulcus Activity

    Science.gov (United States)

    Herrington, John D.; Nymberg, Charlotte; Schultz, Robert T.

    2011-01-01

    Numerous studies implicate superior temporal sulcus (STS) in the perception of human movement. More recent theories hold that STS is also involved in the "understanding" of human movement. However, almost no studies to date have associated STS function with observable variability in action understanding. The present study directly associated STS…

  18. O MARKETING NO ENSINO SUPERIOR: COMPARATIVO BRASIL-PORTUGAL

    Directory of Open Access Journals (Sweden)

    Helena Alves

    2010-12-01

    Full Text Available Ao abordar o marketing aplicado ao ensino superior, este estudo tem como objetivos discutir os conceitos teóricos do marketing educacional e aplicálos aos contextos brasileiro e português. Tendo em consideração que o marketing educacional tem a sua maior expressão nos E.U.A., a sua aplicação a diferentes realidades e culturas requer adaptações. Inicialmente, fez-se uma revisão dos conceitos tradicionais de marketing educacional, com ênfase nas vantagens, desvantagens e no marketing-mix aplicado à educação. Posteriormente realizou-se uma caraterização dos contextos atuais do ensino superior no Brasil e em Portugal, e fez-se uma comparação da aplicação do marketing educacional nas realidades brasileira e portuguesa, focando as análises no marketing-mix educacional. Percebeu-se que o ensino superior no Brasil tem caraterísticas muito diversas do ensino superior em Portugal e ambos divergem na aplicação dos conceitos mais tradicionais do marketing à educação. Desta forma, faz-se necessária a construção de abordagens teóricas específicas para a aplicação do marketing educacional a diferentes nações.

  19. Organizational Self-Awareness in the Key to Knowledge Superiority

    Science.gov (United States)

    2015-12-01

    a divisionalized bureaucracy (Mintzberg 1981). Designed as an innovation center, it is responsible for, among other things, forecasting and...the system, which prioritizes the needs and selection criteria for that system. 14. SUBJECT TERMS knowledge superiority, innovation , organizational...competitive advantage, knowledge is the critical element needed for any organization to innovate and succeed (Porter and Millar 1985). Its timely and

  20. Radiologic classification of superior canal dehiscence : Implications for surgical repair

    NARCIS (Netherlands)

    Lookabaugh, Sarah; Kelly, Hillary R.; Carter, Margaret S.; Niesten, Marlien E F; McKenna, Michael J.; Curtin, Hugh; Lee, Daniel J.

    2015-01-01

    Objective: Surgical access to repair a superior canal dehiscence (SCD) is influenced by the location of the bony defect and its relationship to surrounding tegmen topography as seen on computed tomography. There are currently no agreed-upon methods of characterizing these radiologic findings. We

  1. Mnemonic Training Reshapes Brain Networks to Support Superior Memory

    NARCIS (Netherlands)

    Dresler, M.; Shirer, W.R.; Konrad, B.N.; Muller, N.C.J.; Wagner, I.; Fernandez, G.S.E.; Czisch, M.; Greicius, M.D.

    2017-01-01

    Memory skills strongly differ across the general population; however, little is known about the brain characteristics supporting superior memory performance. Here we assess functional brain network organization of 23 of the world's most successful memory athletes and matched controls with fMRI

  2. Perturbation resilience and superiorization methodology of averaged mappings

    Science.gov (United States)

    He, Hongjin; Xu, Hong-Kun

    2017-04-01

    We first prove the bounded perturbation resilience for the successive fixed point algorithm of averaged mappings, which extends the string-averaging projection and block-iterative projection methods. We then apply the superiorization methodology to a constrained convex minimization problem where the constraint set is the intersection of fixed point sets of a finite family of averaged mappings.

  3. Measurement of ocular torsion variation following superior oblique tenectomy

    Directory of Open Access Journals (Sweden)

    Bruna Lana Ducca

    2014-12-01

    Full Text Available Purposes: To objectively evaluate the torsional effect of the superior oblique muscle-weakening surgery using the tenectomy technique proposed by Souza-Dias. Methods: The present prospective study included 10 patients (20 eyes with horizontal strabismus, bilateral superior oblique overaction and A-pattern of 15 to 30 prism diopters who underwent superior oblique tenectomy. Objective assessment of ocular torsion was performed by retinography immediately before and one month after surgery. The amount of ocular torsion was determined by measuring the angle formed by a horizontal line drawn across the geometric center of the optic disc and a second line connecting this point to the fovea. Results: The median preoperative angle was 5.56° in the right eyes and -3.43° in the left eyes. The median postoperative angle was 1.84° in the right eyes and -3.12° in the left eyes. The angle variation was statistically significant in both eyes (p=0.012 and p=0.01, respectively. Conclusion: The present study suggests that superior oblique tenectomy has an extorter effect, decreasing the intorsion detected on overaction of this muscle.

  4. Superior Mesenteric Artery Syndrome in a Young Military Basic Trainee

    Science.gov (United States)

    2013-03-01

    patients with severe anorexia nervosa .10 Severe cases may require surgery or parenteral feeding because of food avoidance leading to further loss of...2012. 10. Gwee K, Teh A, Huang C: Acute superior mesenteric artery syndrome and pancreatitis in anorexia nervosa . Australas Psychiatry 2010; 18(6): 523

  5. El contexto virtual en la educación superior

    National Research Council Canada - National Science Library

    Vera Quintana, Mercedes

    2015-01-01

    ... técnicos, organizativos y metodológicos, por tanto, la virtualización de la educación superior durante su relativa corta vida, ha sido ese nuevo paradigma educativo resultante del uso de las tecnologías...

  6. Evaluation of the Superior Gluteal Nerve During Proximal Femoral Nailing

    Directory of Open Access Journals (Sweden)

    Mehmet Sonmez

    2017-05-01

    Full Text Available Aim: The superior gluteal nerve may be compromised during hip surgery. We retrospectively evaluated the patients who underwent proximal femoral nailing for unstable trochanteric fractures in order to investigate the presence of superior gluteal nerve injury and its clinical findings. Material and Method: Twenty five patients (14 women, 11 men were included in the study who had femoral nailing between January 2004 and March 2010 at Hamidiye Sisli Etfal Training and Research Hospital Department of Orthopaedics. Two different types of nails which have similar designs and surgical techniques were used for fracture fixation. Patients who had a history of cerebrovascular disease, electromyography findings of polyneuropathy, or degenerative vertebral disease were excluded from the study. Patients were evaluated clinically and radiologically. Findings related to acute denervation in the gluteus medius muscle and motor unit action potential changes were accepted as signs of superior gluteal nerve injury. Results: Eight patients were using support during walking and three of these patients had positive Trendelenburg sign, but only one patient had acute denervation signs of the superior gluteal nerve. Discussion: Based on the present study the incidence of iatrogenic nerve injury is a rare complication of proximal femoral nailing. Elderly patients, regardless of whether they have nerve injury, may limp and need to use a walking support.

  7. The effect of superior auditory skills on vocal accuracy

    Science.gov (United States)

    Amir, Ofer; Amir, Noam; Kishon-Rabin, Liat

    2003-02-01

    The relationship between auditory perception and vocal production has been typically investigated by evaluating the effect of either altered or degraded auditory feedback on speech production in either normal hearing or hearing-impaired individuals. Our goal in the present study was to examine this relationship in individuals with superior auditory abilities. Thirteen professional musicians and thirteen nonmusicians, with no vocal or singing training, participated in this study. For vocal production accuracy, subjects were presented with three tones. They were asked to reproduce the pitch using the vowel /a/. This procedure was repeated three times. The fundamental frequency of each production was measured using an autocorrelation pitch detection algorithm designed for this study. The musicians' superior auditory abilities (compared to the nonmusicians) were established in a frequency discrimination task reported elsewhere. Results indicate that (a) musicians had better vocal production accuracy than nonmusicians (production errors of 1/2 a semitone compared to 1.3 semitones, respectively); (b) frequency discrimination thresholds explain 43% of the variance of the production data, and (c) all subjects with superior frequency discrimination thresholds showed accurate vocal production; the reverse relationship, however, does not hold true. In this study we provide empirical evidence to the importance of auditory feedback on vocal production in listeners with superior auditory skills.

  8. Visuospatial Superiority in Developmental Dyslexia: Myth or Reality?

    Science.gov (United States)

    Brunswick, Nicola; Martin, G. Neil; Marzano, Lisa

    2010-01-01

    Anecdotal evidence indicates that dyslexia is positively associated with superior visuospatial ability but empirical evidence is inconsistent. We explicitly tested the hypothesis that dyslexia is associated with visuospatial advantage in 20 dyslexic and 21 unimpaired adult readers using paper-and-pencil measures and tests of "everyday"…

  9. Early detection of non-indigenous fishes in Lake Superior

    Science.gov (United States)

    Invasive species pose a serious threat to the ecological stability of the Great Lakes warranting continual monitoring for the arrival of new species. Three locations in Lake Superior were identified as “high risk” for new introductions: St. Louis River near Duluth, M...

  10. Preference for concentric orientations in the mouse superior colliculus

    NARCIS (Netherlands)

    Ahmadlou, Mehran; Heimel, J Alexander

    2015-01-01

    The superior colliculus is a layered structure important for body- and gaze-orienting responses. Its superficial layer is, next to the lateral geniculate nucleus, the second major target of retinal ganglion axons and is retinotopically organized. Here we show that in the mouse there is also a

  11. Funciones superiores en pacientes con accidente cerebro vascular

    National Research Council Canada - National Science Library

    Felipe Rodríguez; Alfonso Urzúa

    2009-01-01

    .... Con base a esto el objetivo de esta investigación fue elaborar un perfil de deterioro neuropsicológico de las diversas funciones cerebrales superiores causado por un ACV, en un grupo de 50 pacientes de la Unidad de Medicina...

  12. Absence of the superior petrosal veins and sinus: Surgical considerations

    Directory of Open Access Journals (Sweden)

    Ken Matsushima

    2015-01-01

    Conclusions: In cases in which the superior petrosal sinus and veins are absent, care should be directed to preserving the collateral drainage through the galenic and tentorial tributaries. Although surgical strategies for intraoperative management and preservation of venous structures are still controversial, knowledge of the possible anatomical variations is considered to be essential to improve surgical outcomes.

  13. Lake Superior supports novel clusters of cyanobacterial picoplankton.

    Science.gov (United States)

    Ivanikova, Natalia V; Popels, Linda C; McKay, R Michael L; Bullerjahn, George S

    2007-06-01

    Very little is known about the biodiversity of freshwater autotrophic picoplankton (APP) in the Laurentian Great Lakes, a system comprising 20% of the world's lacustrine freshwater. In this study, the genetic diversity of Lake Superior APP was examined by analyzing 16S rRNA gene and cpcBA PCR amplicons from water samples. By neighbor joining, the majority of 16S rRNA gene sequences clustered within the "picocyanobacterial clade" consisting of freshwater and marine Synechococcus and Prochlorococcus. Two new groups of Synechococcus spp., the pelagic Lake Superior clusters I and II, do not group with any of the known freshwater picocyanobacterial clusters and were the most abundant species (50 to 90% of the sequences) in samples collected from offshore Lake Superior stations. Conversely, at station Portage Deep (PD), located in a nearshore urbanized area, only 4% of the sequences belonged to these clusters and the remaining clones reflected the freshwater Synechococcus diversity described previously at sites throughout the world. Supporting the 16S rRNA gene data, the cpcBA library from nearshore station PD revealed a cosmopolitan diversity, whereas the majority of the cpcBA sequences (97.6%) from pelagic station CD1 fell within a unique Lake Superior cluster. Thus far, these picocyanobacteria have not been cultured, although their phylogenetic assignment suggests that they are phycoerythrin (PE) rich, consistent with the observation that PE-rich APP dominate Lake Superior picoplankton. Lastly, flow cytometry revealed that the summertime APP can exceed 10(5) cells ml-1 and suggests that the APP shifts from a community of PE and phycocyanin-rich picocyanobacteria and picoeukaryotes in winter to a PE-rich community in summer.

  14. [Examination of the hypothesis 'the factors and mechanisms of superiority'].

    Science.gov (United States)

    Sierra-Fitzgerald, O; Quevedo-Caicedo, J; López-Calderón, M G

    INTRODUCTION. The hypothesis of Geschwind and Galaburda suggests that specific cognitive superiority arises as a result of an alteration in development of the nervous system. In this article we review the co existence of superiority and inferiority . PATIENTS AND METHODS. A study was made of six children aged between 6 and 8 years old at the Instituto de Belles Artes Antonio Maria Valencia in Cali,Columbia with an educational level between second and third grade at a primary school and of medium low socio economic status. The children were considered to have superior musical ability by music experts, which is the way in which the concept of superiority was to be tested. The concept of inferiority was tested by neuropsychological tests = 1.5 DE below normal for the same age. We estimated the perinatal neurological risk in each case. Subsequently the children s general intelligence and specific cognitive abilities were evaluated. In the first case the WISC R and MSCA were used. The neuropsychological profiles were obtained by broad evaluation using a verbal fluency test, a test using counters, Boston vocabulary test, the Wechster memory scale, sequential verbal memory test, super imposed figures test, Piaget Head battery, Rey Osterrieth complex figure and the Wisconsin card classification test. The RESULTS showed slight/moderate deficits in practical construction ability and mild defects of memory and concept abilities. In general the results supported the hypothesis tested. The mechanisms of superiority proposed in the classical hypothesis mainly involve the contralateral hemisphere: in this study the ipsilateral mechanism was more important.

  15. Vertebral uptake of Tc-99m macroaggregated albumin (MAA) with SPECT/CT occurring in superior vena cava obstruction

    Energy Technology Data Exchange (ETDEWEB)

    Karls, Shawn; Hassoun, Hani; Derbekyan, Vilma [Dept. of Nuclear Madicine, Royal Victoria Hospital, Montreal (Canada)

    2016-09-15

    A 67-year-old male presented with dyspnea for which lung scintigraphy was ordered to rule out pulmonary embolus. Planar images demonstrated abnormal midline uptake of Tc-99m macroaggregated albumin, which SPECT/CT localized to several thoracic vertebrae. Thoracic vertebral uptake on perfusion lung scintigraphy was previously described on planar imaging. Radionuclide venography and contrast-enhanced CT subsequently demonstrated superior vena cava (SVC) obstruction with collateralization through the azygous/hemiazygous system and vertebral venous plexus. SPECT/CT differentiated residual esophageal/tracheal ventilation activity, a clinically insignificant finding, from vertebral uptake indicative of SVC obstruction, a potentially life-threatening condition.

  16. Bioaccumulation of toxaphene congeners in the lake superior food web

    Science.gov (United States)

    Muir, D.C.G.; Whittle, D.M.; De Vault, D. S.; Bronte, C.R.; Karlsson, H.; Backus, S.; Teixeira, C.

    2004-01-01

    The bioaccumulation and biotransformation of toxaphene was examined in the food webs of Lake Superior and Siskiwit Lake (Isle Royale) using congener specific analysis as well as stable isotope ratios of carbon and nitrogen to characterize food webs. Toxaphene concentrations (calculated using technical toxaphene) in lake trout (Salvelinus namaycush) from the western basin of Lake Superior (N = 95) averaged (±SD) 889 ± 896 ng/g wet wt and 60 ± 34 ng/g wet wt in Siskiwit Lake. Major congeners in lake trout were B8-789 (P38), B8-2226 (P44), B9-1679 (P50), and B9-1025 (P62). Toxaphene concentrations were found to vary seasonally, especially in lower food web organisms in Lake Superior and to a lesser extent in Siskiwit Lake. Toxaphene concentrations declined significantly in lake herring (Coregonus artedii), rainbow smelt (Omerus mordax), and slimy sculpin (Cottus cognatus) as well as in zooplankton (> 102 &mn;m) and Mysis (Mysis relicta) between May and October. The seasonal variation may reflect seasonal shifts in the species abundance within the zooplankton community. Trophic magnification factors (TMF) derived from regressions of toxaphene congener concentrations versus δ15N were > 1 for most octa- and nonachlorobornanes in Lake Superior except B8-1413 (P26) and B9-715. Log bioaccumulation factors (BAFs) for toxaphene congeners in lake trout (ng/g lipid/ng/L dissolved) ranged from 4.54 to 9.7 and were significantly correlated with log octanol-water partition coefficients. TMFs observed for total toxaphene and congener B9-1679 in Lake Superior were similar to those in Arctic lakes, as well as to previous studies in the Great Lakes, which suggests that the bioaccumulation behavior of toxaphene is similar in pelagic food webs of large, cold water systems. However, toxaphene concentrations were lower in lake trout from Siskiwit Lake and lakes in northwestern Ontario than in Lake Superior possibly because of shorter food chains and greater reliance on zooplankton or

  17. PET/MR Imaging in Gynecologic Oncology.

    Science.gov (United States)

    Ohliger, Michael A; Hope, Thomas A; Chapman, Jocelyn S; Chen, Lee-May; Behr, Spencer C; Poder, Liina

    2017-08-01

    MR imaging and PET using 2-Deoxy-2-[(18)F]fluoroglucose (FDG) are both useful in the evaluation of gynecologic malignancies. MR imaging is superior for local staging of disease whereas fludeoxyglucose FDG PET is superior for detecting distant metastases. Integrated PET/MR imaging scanners have great promise for gynecologic malignancies by combining the advantages of each modality into a single scan. This article reviews the technology behind PET/MR imaging acquisitions and technical challenges relevant to imaging the pelvis. A dedicated PET/MR imaging protocol; the roles of PET and MR imaging in cervical, endometrial, and ovarian cancers; and future directions for PET/MR imaging are discussed. Copyright © 2017 Elsevier Inc. All rights reserved.

  18. Whole mouse cryo-imaging

    Science.gov (United States)

    Wilson, David; Roy, Debashish; Steyer, Grant; Gargesha, Madhusudhana; Stone, Meredith; McKinley, Eliot

    2008-03-01

    The Case cryo-imaging system is a section and image system which allows one to acquire micron-scale, information rich, whole mouse color bright field and molecular fluorescence images of an entire mouse. Cryo-imaging is used in a variety of applications, including mouse and embryo anatomical phenotyping, drug delivery, imaging agents, metastastic cancer, stem cells, and very high resolution vascular imaging, among many. Cryo-imaging fills the gap between whole animal in vivo imaging and histology, allowing one to image a mouse along the continuum from the mouse -> organ -> tissue structure -> cell -> sub-cellular domains. In this overview, we describe the technology and a variety of exciting applications. Enhancements to the system now enable tiled acquisition of high resolution images to cover an entire mouse. High resolution fluorescence imaging, aided by a novel subtraction processing algorithm to remove sub-surface fluorescence, makes it possible to detect fluorescently-labeled single cells. Multi-modality experiments in Magnetic Resonance Imaging and Cryo-imaging of a whole mouse demonstrate superior resolution of cryo-images and efficiency of registration techniques. The 3D results demonstrate the novel true-color volume visualization tools we have developed and the inherent advantage of cryo-imaging in providing unlimited depth of field and spatial resolution. The recent results continue to demonstrate the value cryo-imaging provides in the field of small animal imaging research.

  19. HTLV-I carrier with unusual brain MR imaging findings

    Energy Technology Data Exchange (ETDEWEB)

    Yata, Shinsaku; Ogawa, Toshihide; Sugihara, Shuji; Matsusue, Eiji; Fujii, Shinya; Kinoshita, Toshibumi [Tottori University, Department of Pathophysiological and Therapeutic Science, Yonago (Japan); Faculty of Medicine, Tottori University, Yonago (Japan)

    2004-09-01

    We describe unusual brain MR imaging findings in a patient who is an HTLV-I carrier without myelopathy. T2-weighted MR images showed hyperintense signal abnormalities in the pyramidal tract, superior and middle cerebellar peduncles, and decussation of the superior cerebellar peduncles, in addition to subcortical white matter involvement. Diffusion-weighted images also showed hyperintense signal abnormalities in the same regions by T2 shine-through effect. (orig.)

  20. Can linear superiorization be useful for linear optimization problems?

    Science.gov (United States)

    Censor, Yair

    2017-04-01

    Linear superiorization (LinSup) considers linear programming problems but instead of attempting to solve them with linear optimization methods it employs perturbation resilient feasibility-seeking algorithms and steers them toward reduced (not necessarily minimal) target function values. The two questions that we set out to explore experimentally are: (i) does LinSup provide a feasible point whose linear target function value is lower than that obtained by running the same feasibility-seeking algorithm without superiorization under identical conditions? (ii) How does LinSup fare in comparison with the Simplex method for solving linear programming problems? Based on our computational experiments presented here, the answers to these two questions are: ‘yes’ and ‘very well’, respectively.

  1. Anterior superior instability with rotator cuff tearing: SLAC lesion.

    Science.gov (United States)

    Savoie, F H; Field, L D; Atchinson, S

    2001-07-01

    Anterosuperior instability of the shoulder may occur from a variety of pathologic lesions. We describe a specific entity, the SLAC (superior labrum, anterior cuff) lesion that involves an association of anterior-superior labral tear with a partial supraspinatus tear. We retrospectively isolated a group of 40 patients with this lesion. The presenting complaints, physical examination findings, surgical findings, and results were isolated. Overhead activities were the most common etiology; load and shift instability testing and whipple rotator cuff testing were the most common physical examination findings. Surgical repair was successful in 37 of the 40 patients. The SLAC lesion is a definable clinical entity with predictable history, examination, surgical pathology, and satisfactory results from surgery.

  2. Superior gluteal nerve entrapment between two bellies of piriformis muscle

    Directory of Open Access Journals (Sweden)

    Yadav Y

    2010-12-01

    Full Text Available A double belly composition of piriformis muscle with superior gluteal nerve entrapment between the two muscle masses was detected. Piriformis muscle and its relation to sciatic nerve has been suggested as a cause of piriformis syndrome. Patients suffering from buttock pain are most often diagnosed as having piriformis syndrome, where anatomical variation of the piriformis is an important contributor. The present variation showed two distinct bellies of piriformis muscle. Interestingly the superior gluteal nerve was interposed between the two bellies. Such incidental findings on cadavers may help the clinicians to establish a rare yet important cause of piriformis syndrome. Furthermore, such observations are also relevant to the radiologists while interpreting MRI scans in cases of undiagnosed chronic gluteal pain.

  3. Laparoscopic Pancreaticoduodenectomy: Right Posterior Superior Mesenteric Artery "First" Approach.

    Science.gov (United States)

    Pittau, Gabriella; Sànchez-Cabùs, Santiago; Laurenzi, Andrea; Gelli, Maximiliano; Cunha, Antonio Sa

    2015-12-01

    Pancreaticoduodenectomy (PD) is considered one of the most challenging abdominal operations for several reasons, including the anatomy, which is surrounded by vital vascular structures and also because of the serious complications that are possible in the postoperative period. Nowadays, thanks to the development of minimally invasive surgery and improvement of patients' selection, laparoscopic pancreatic resections have been proven to be technically feasible and safe especially in the case of left pancreatectomies. More recently, many series of laparoscopic PD for adenocarcinoma have been published demonstrating the feasibility of this technique. In pancreatic cancer, the advantage of superior mesenteric artery "first approach" is already known to achieve an oncological resection. The purpose of this video is to describe the different technical aspects of the laparoscopic superior mesenteric artery first approach in the right posterior fashion.

  4. Surgical approach to the superior mid-orbit.

    Science.gov (United States)

    Krohn-Hansen, Dag; Nicolaissen, Bjørn; Meling, Torstein R; Haaskjold, Erling

    2013-09-01

    Access to the superior mid-orbit is required for procedures on the levator muscle in the correction of upper eyelid ptosis and in surgery aimed at local lesions in this region. The purpose with this human cadaver study was to clarify the anatomical substrate for a surgical approach to the levator muscle and the upper mid-orbit structures, in which the orbital septum and the retroseptal fat pad is not harmed during surgery. Macro-anatomical dissections and histological examinations were performed on five human orbits from three formalin embalmed cadaver heads. It was found that the orbital septum extends posteriorly from its junction with the levator aponeurosis. This posterior continuation of the orbital septum encloses the superior orbital fat pad and separates this from the anterior surface of the levator muscle. In between the orbital septum and the levator, there is a dissection space that provides a minimal invasive access corridor to the structures in the upper mid-orbit.

  5. False memories in highly superior autobiographical memory individuals.

    Science.gov (United States)

    Patihis, Lawrence; Frenda, Steven J; LePort, Aurora K R; Petersen, Nicole; Nichols, Rebecca M; Stark, Craig E L; McGaugh, James L; Loftus, Elizabeth F

    2013-12-24

    The recent identification of highly superior autobiographical memory (HSAM) raised the possibility that there may be individuals who are immune to memory distortions. We measured HSAM participants' and age- and sex-matched controls' susceptibility to false memories using several research paradigms. HSAM participants and controls were both susceptible to false recognition of nonpresented critical lure words in an associative word-list task. In a misinformation task, HSAM participants showed higher overall false memory compared with that of controls for details in a photographic slideshow. HSAM participants were equally as likely as controls to mistakenly report they had seen nonexistent footage of a plane crash. Finding false memories in a superior-memory group suggests that malleable reconstructive mechanisms may be fundamental to episodic remembering. Paradoxically, HSAM individuals may retrieve abundant and accurate autobiographical memories using fallible reconstructive processes.

  6. Genomes for jeans: cotton genomics for engineering superior fiber.

    Science.gov (United States)

    Mansoor, Shahid; Paterson, Andrew H

    2012-10-01

    Twenty years ago, scientists predicted that better understanding of fiber development would lead to novel ways to engineer superior cotton fiber. Advances in genetic resources, DNA markers, DNA sequence information, and gene expression data have indeed provided new insights into fiber initiation, elongation and maturation. Many exciting applications of this knowledge offer the potential to select better cotton genotypes more effectively in mainstream breeding programs or engineer genotypes with improved agronomic and/or quality traits. Here, we discuss recent progress in understanding genes involved in fiber development, and their regulation and manipulation to engineer improved fibers. Better understanding of quantitative trait loci/gene interactions that influence fiber quality and yield may help to tailor superior cotton genotypes to diverse environments.

  7. Tullio phenomenon in superior semicircular canal dehiscence syndrome.

    Science.gov (United States)

    Basura, Gregory J; Cronin, Scott J; Heidenreich, Katherine D

    2014-03-18

    Tullio phenomenon refers to eye movements induced by sound.(1) This unusual examination finding may be seen in superior semicircular canal dehiscence (SSCD) syndrome.(2) This disorder is due to absent bone over the superior semicircular canal (figure). Patients complain of dizziness triggered by loud sound, aural fullness, autophony, and pulsatile tinnitus. When Tullio phenomenon exists in SSCD syndrome, the patient develops a mixed vertical-torsional nystagmus in which the slow phase rotates up and away from the affected ear (video on the Neurology® Web site at Neurology.org). This pattern of nystagmus aligns in the plane of the dehiscent semicircular canal and is due to excitation of its afferent nerves.

  8. Implantation of VVI pacemaker in a patient with dextrocardia, persistent left superior vena cava, and sick sinus syndrome

    Science.gov (United States)

    Guo, Gongliang; Yang, Lili; Wu, Jinyi; Sun, Liqun

    2017-01-01

    Abstract Background: Dextrocardia, or right-lying heart, is an uncommon congenital heart disease in which the apex of the heart is located on the right side of chest. Persistent left superior vena cava (PLSVA) is a rare venous anomaly that is often associated with the abnormalities of cardiac transduction system. A case with combination of dextrocardia, persistent left superior vena cava, and sick sinus syndrome has not been reported. Methods: We used different techniques including cardiac color Doppler echocardiography, 24-hour Holter monitoring, and abdominal ultrasound to make a diagnosis and treated the patient by implanting a VVI pacemaker. Results: A 50-year-old woman was admitted with a syncope. Angiography of the right atrium and superior vena cava, echocardiography, electrocardiography, and abdominal ultrasound revealed the presence of the combination of mirror image dextrocardia, PLSVA, and sick sinus syndrome. The complex structural anomalies presented great technical challenges for interventional treatments. After thorough examination and understanding of the structural anatomy and anomalies of the superior and inferior vena cava and cardiac chambers, we successfully treated this patient by implanting a VVI pacemaker. Conclusion: Physicians must be aware of the complexity of the morphological and anatomical structures of dextrocardia accompanying PLSVC. Given that the diagnosis of situs inversus was performed at a relatively advanced age, it is therefore important to make such a correct diagnosis followed by appropriate therapeutic intervention. PMID:28151908

  9. Functional Connectivity Between Superior Parietal Lobule and Primary Visual Cortex "at Rest" Predicts Visual Search Efficiency.

    Science.gov (United States)

    Bueichekú, Elisenda; Ventura-Campos, Noelia; Palomar-García, María-Ángeles; Miró-Padilla, Anna; Parcet, María-Antonia; Ávila, César

    2015-10-01

    Spatiotemporal activity that emerges spontaneously "at rest" has been proposed to reflect individual a priori biases in cognitive processing. This research focused on testing neurocognitive models of visual attention by studying the functional connectivity (FC) of the superior parietal lobule (SPL), given its central role in establishing priority maps during visual search tasks. Twenty-three human participants completed a functional magnetic resonance imaging session that featured a resting-state scan, followed by a visual search task based on the alphanumeric category effect. As expected, the behavioral results showed longer reaction times and more errors for the within-category (i.e., searching a target letter among letters) than the between-category search (i.e., searching a target letter among numbers). The within-category condition was related to greater activation of the superior and inferior parietal lobules, occipital cortex, inferior frontal cortex, dorsal anterior cingulate cortex, and the superior colliculus than the between-category search. The resting-state FC analysis of the SPL revealed a broad network that included connections with the inferotemporal cortex, dorsolateral prefrontal cortex, and dorsal frontal areas like the supplementary motor area and frontal eye field. Noteworthy, the regression analysis revealed that the more efficient participants in the visual search showed stronger FC between the SPL and areas of primary visual cortex (V1) related to the search task. We shed some light on how the SPL establishes a priority map of the environment during visual attention tasks and how FC is a valuable tool for assessing individual differences while performing cognitive tasks.

  10. Right anterior superior temporal activation predicts auditory sentence comprehension following aphasic stroke.

    Science.gov (United States)

    Crinion, Jenny; Price, Cathy J

    2005-12-01

    Previous studies have suggested that recovery of speech comprehension after left hemisphere infarction may depend on a mechanism in the right hemisphere. However, the role that distinct right hemisphere regions play in speech comprehension following left hemisphere stroke has not been established. Here, we used functional magnetic resonance imaging (fMRI) to investigate narrative speech activation in 18 neurologically normal subjects and 17 patients with left hemisphere stroke and a history of aphasia. Activation for listening to meaningful stories relative to meaningless reversed speech was identified in the normal subjects and in each patient. Second level analyses were then used to investigate how story activation changed with the patients' auditory sentence comprehension skills and surprise story recognition memory tests post-scanning. Irrespective of lesion site, performance on tests of auditory sentence comprehension was positively correlated with activation in the right lateral superior temporal region, anterior to primary auditory cortex. In addition, when the stroke spared the left temporal cortex, good performance on tests of auditory sentence comprehension was also correlated with the left posterior superior temporal cortex (Wernicke's area). In distinct contrast to this, good story recognition memory predicted left inferior frontal and right cerebellar activation. The implication of this double dissociation in the effects of auditory sentence comprehension and story recognition memory is that left frontal and left temporal activations are dissociable. Our findings strongly support the role of the right temporal lobe in processing narrative speech and, in particular, auditory sentence comprehension following left hemisphere aphasic stroke. In addition, they highlight the importance of the right anterior superior temporal cortex where the response was dissociated from that in the left posterior temporal lobe.

  11. CURRENT COLLOIDAL DISPERSION GELS ARE NOT SUPERIOR TO POLYMER FLOODING

    Institute of Scientific and Technical Information of China (English)

    Seright Randy; Han Peihui; Wang Dongmei

    2006-01-01

    The suggestion that the colloidal-dispersion-gel (CDG) process is superior to normal polymer flooding is misleading and generally incorrect. Colloidal dispersion gels, in their present state of technological development, should not be advocated as an improvement to, or substitute for, polymer flooding. Gels made from aluminum-citrate crosslinked polyacrylamides can act as conventional gels and provide effective conformance improvement in treating some types of excess water production problems if sound scientific and engineering principles are respected.

  12. Pseudoaneurysm of the superior gluteal artery following polytrauma

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Dennis [Vancouver General Hospital, University of British Columbia and Department of Radiology, Vancouver, BC (Canada); Legiehn, Gerald M. [Vancouver General Hospital, Interventional Radiology, University of British Columbia and Department of Radiology, Vancouver, BC (Canada); Munk, Peter L. [Vancouver General Hospital, MSK Section, University of British Columbia and Department of Radiology, Vancouver, BC (Canada)

    2007-09-15

    Gluteal artery aneurysms are rare and often secondary to pelvic fractures, blunt or penetrating trauma. We describe a case of a superior gluteal artery pseudoaneurysm that presented as back pain with numbness and weakness of the lower extremities. Diagnosis was confirmed by color Doppler sonography and angiography. A proximal and distal control was obtained over the aneurysm neck via coil embolization with excellent hemostasis within the pseudoaneurysm and maintenance of perfusion to the left pelvis. (orig.)

  13. [Superior gluteal nerve: a new block on the block?

    Science.gov (United States)

    Sá, Miguel; Graça, Rita; Reis, Hugo; Cardoso, José Miguel; Sampaio, José; Pinheiro, Célia; Machado, Duarte

    2017-05-24

    The superior gluteal nerve is responsible for innervating the gluteus medius, gluteus minimus and tensor fascia latae muscles, all of which can be injured during surgical procedures. We describe an ultrasound-guided approach to block the superior gluteal nerve which allowed us to provide efficient analgesia and anesthesia for two orthopedic procedures, in a patient who had significant risk factors for neuraxial techniques and deep peripheral nerve blocks. An 84-year-old female whose regular use of clopidogrel contraindicated neuraxial techniques or deep peripheral nerve blocks presented for urgent bipolar hemiarthroplasty in our hospital. Taking into consideration the surgical approach chosen by the orthopedic team, we set to use a combination of general anesthesia and superficial peripheral nerve blocks (femoral, lateral cutaneous of thigh and superior gluteal nerve) for the procedure. A month and a half post-discharge the patient was re-admitted for debriding and correction of suture dehiscence; we performed the same blocks and light sedation. She remained comfortable in both cases, and reported no pain in the post-operative period. Deep understanding of anatomy and innervation empowers anesthesiologists to solve potentially complex cases with safer, albeit creative, approaches. The relevance of this block in this case arises from its innervation of the gluteus medius muscle and posterolateral portion of the hip joint. To the best of our knowledge, this is the first report of an ultrasound-guided superior gluteal nerve block with an analgesic and anesthetic goal, which was successfully achieved. Copyright © 2016 Sociedade Brasileira de Anestesiologia. Publicado por Elsevier Editora Ltda. All rights reserved.

  14. Superior gluteal nerve entrapment between two bellies of piriformis muscle

    OpenAIRE

    Yadav Y; Mehta V; Roy S; Suri R; Rath G

    2010-01-01

    A double belly composition of piriformis muscle with superior gluteal nerve entrapment between the two muscle masses was detected. Piriformis muscle and its relation to sciatic nerve has been suggested as a cause of piriformis syndrome. Patients suffering from buttock pain are most often diagnosed as having piriformis syndrome, where anatomical variation of the piriformis is an important contributor. The present variation showed two distinct bellies of piriformis muscle. Interestingly the sup...

  15. Pseudoaneurysm of the superior gluteal artery following polytrauma.

    Science.gov (United States)

    Lee, Dennis; Legiehn, Gerald M; Munk, Peter L

    2007-09-01

    Gluteal artery aneurysms are rare and often secondary to pelvic fractures, blunt or penetrating trauma. We describe a case of a superior gluteal artery pseudoaneurysm that presented as back pain with numbness and weakness of the lower extremities. Diagnosis was confirmed by color Doppler sonography and angiography. A proximal and distal control was obtained over the aneurysm neck via coil embolization with excellent hemostasis within the pseudoaneurysm and maintenance of perfusion to the left pelvis.

  16. Information Superiority generated through proper application of Geoinformatics

    Science.gov (United States)

    Teichmann, F.

    2012-04-01

    Information Superiority generated through proper application of Geoinformatics Information management and especially geoscience information delivery is a very delicate task. If it is carried out successfully, geoscientific data will provide the main foundation of Information Superiority. However, improper implementation of geodata generation, assimilation, distribution or storage will not only waste valuable resources like manpower or money, but could also give rise to crucial deficiency in knowledge and might lead to potentially extremely harmful disasters or wrong decisions. Comprehensive Approach, Effect Based Operations and Network Enabled Capabilities are the current buzz terms in the security regime. However, they also apply to various interdisciplinary tasks like catastrophe relief missions, civil task operations or even in day to day business operations where geo-science data is used. Based on experience in the application of geoscience data for defence applications the following procedure or tool box for generating geodata should lead to the desired information superiority: 1. Understand and analyse the mission, the task and the environment for which the geodata is needed 2. Carry out a Information Exchange Requirement between the user or customer and the geodata provider 3. Implementation of current interoperability standards and a coherent metadata structure 4. Execute innovative data generation, data provision, data assimilation and data storage 5. Apply a cost-effective and reasonable data life cycle 6. Implement IT security by focusing of the three pillar concepts Integrity, Availability and Confidentiality of the critical data 7. Draft and execute a service level agreement or a memorandum of understanding between the involved parties 8. Execute a Continuous Improvement Cycle These ideas from the IT world should be transferred into the geoscience community and applied in a wide set of scenarios. A standardized approach of how to generate, provide

  17. Superior Mesenteric Artery Syndrome: An Infrequent Complication of Scoliosis Surgery

    OpenAIRE

    Metin Keskin; Turgut Akgül; Adem Bayraktar; Fatih Dikici; Emre Balık

    2014-01-01

    Case Report Superior Mesenteric Artery Syndrome: An Infrequent Complication of Scoliosis Surgery Metin Keskin,1 Turgut Akgül,2 Adem Bayraktar,1 Fatih Dikici,2 and Emre BalJk3 1 General Surgery Department, Istanbul Faculty of Medicine, Istanbul University, Capa, Millet Caddesi, 34093 Istanbul, Turkey 2Orthopedic Department, Istanbul Faculty of Medicine, Istanbul University, Capa, Millet Caddesi, 34093 Istanbul, Turkey 3 General Surgery Department, School of Medicine, Koc¸ Uni...

  18. São os membros superiores na Paralisia Cerebral negligenciados?

    Directory of Open Access Journals (Sweden)

    Ubiratan Brum Castro

    2014-06-01

    Full Text Available Objetivo: Avaliar se num serviço de atendimento especializado, o membro superior é preterido ou negligenciado no tratamento das alterações motoras da Paralisia Cerebral. Casuística e métodos: Foram analisados 80 pacientes portadores de Paralisia Cerebral menores de dezessete anos tratados institucionalmente. Foram avaliados pelo mesmo examinador quanto à classificação e tratamentos (cirúrgico ou não do aparelho locomotor. Resultados: O membro superior teve a seguinte abordagem terapêutica considerando o grupo de mão comprometida, 1 (2% foi submetido a transferência tendinosa no punho e 53 (98% não foram operados. Quanto a órteses, 9 (17% usavam estabilizadores de punho e 45 (83% não usavam. Quanto à toxina botulínica não houve aplicação nos membros superiores. Nos membros inferiores, considerando o total de pacientes, 16 (20% foram submetidos à cirurgia e 64(80% não foram operados. As cirurgias foram um tratamento cirúrgico de luxação do quadril, 7 a alongamentos múltiplos em membros inferiores, 5 alongamento de tendão calcâneo, 3 tenotomia de adutores. Quanto ao uso de órteses, 49 (61% faziam uso e 31(39% não utilizavam. Dos pacientes que faziam uso de órteses, 48 usavam tala estabilizadora de tornozelo, um usava estabilizador de joelho. Quanto à  o uso de toxina botulínica: 32 tiveram aplicação (40% e 48 não receberam aplicação (60%. Conclusão: No presente estudo, o tratamento do membro superior foi negligenciado.

  19. Effect of bilateral superior oblique split lengthening on torsion

    Directory of Open Access Journals (Sweden)

    Jitendra Jethani

    2015-01-01

    Full Text Available Introduction: Superior oblique split lengthening (SOSL is done for weakening of superior oblique. It corrects the superior oblique overaction (SOOA and A pattern. Its effect on the torsion of the eye is not known. We present our data on the effect of this particular procedure on torsion. Materials and Methods: We did a study of 16 patients (32 eyes who underwent bilateral SOSL and compared the disc foveal angle (DFA preoperatively and postoperatively. The split lengthening was done from 4 mm to 7 mm depending upon the overaction of superior oblique. Results: The mean age was 15.3 ± 8.4 years. Mean preoperative DFA in the right eye (RE was −3.9° and in the left eye (LE was −2.9°. Mean postoperative DFA in RE was 0.2° and in LE was 0.9°. The mean change in the DFA for RE was 4.1° ± 1.3° and for LE was 3.8° ± 1.2°. All the patients were aligned horizontally within 6 prism diopter and no pattern and no diplopia postoperatively. The A pattern was corrected in all the patient postsurgery. For each mm of surgery, an improvement of 0.8° was seen in the DFA. Conclusion: We report the effect of SOSL on torsion. The SOSL reduces intorsion postsurgery and is, therefore, a valuable procedure in SOOA where both pattern and in torsion needs to be corrected.

  20. A Rare Complication of Acute Appendicitis: Superior Mesenteric Vein Thrombosis

    Directory of Open Access Journals (Sweden)

    Hendra Koncoro

    2016-12-01

    Full Text Available Superior mesenteric vein (SMV thrombosis caused by acute appendicitis is quite rare nowadays. These conditions occurs secondary to infection in the region drained by the portal venous system. In this case, we report a successfully treated case of SMV thrombosis and liver abscess associated with appendicitis with antibiotics and anticoagulant.Early diagnosis and prompt treatment are basic to a favorable clinical course.

  1. Superior Gas Sensing Properties of Monolayer PtSe2

    KAUST Repository

    Sajjad, Muhammad

    2016-12-15

    First-principles calculations of the structural and electronic properties of monolayer 1T-PtSe2 with adsorbed (a) NO2, (b) NO, (c) NH3, (d) H2O, (e) CO2, and (f) CO molecules are discussed. The results point to great potential of the material in gas sensor applications. Superior sensitivity is demonstrated by transport calculations using the nonequilibrium Green\\'s function method.

  2. Kernel based subspace projection of hyperspectral images

    DEFF Research Database (Denmark)

    Larsen, Rasmus; Nielsen, Allan Aasbjerg; Arngren, Morten

    In hyperspectral image analysis an exploratory approach to analyse the image data is to conduct subspace projections. As linear projections often fail to capture the underlying structure of the data, we present kernel based subspace projections of PCA and Maximum Autocorrelation Factors (MAF). Th......). The MAF projection exploits the fact that interesting phenomena in images typically exhibit spatial autocorrelation. The analysis is based on nearinfrared hyperspectral images of maize grains demonstrating the superiority of the kernelbased MAF method....

  3. The Relationships of the Maxillary Sinus With the Superior Alveolar Nerves and Vessels as Demonstrated by Cone-Beam CT Combined With μ-CT and Histological Analyses.

    Science.gov (United States)

    Kasahara, Norio; Morita, Wataru; Tanaka, Ray; Hayashi, Takafumi; Kenmotsu, Shinichi; Ohshima, Hayato

    2016-05-01

    There are no available detailed data on the three-dimensional courses of the human superior alveolar nerves and vessels. This study aimed to clarify the relationships of the maxillary sinus with the superior alveolar nerves and vessels using cone-beam computed tomography (CT) combined with μ-CT and histological analyses. Digital imaging and communication in medicine data obtained from the scanned heads/maxillae of cadavers used for undergraduate/postgraduate dissection practice and skulls using cone-beam CT were reconstructed into three-dimensional (3D) images using software. The 3D images were compared with μ-CT images and histological sections. Cone-beam CT clarified the relationships of the maxillary sinus with the superior alveolar canals/grooves. The main anterior superior alveolar canal/groove ran anteriorly through the upper part of the sinus and terminated at the bottom of the nasal cavity near the piriform aperture. The main middle alveolar canal ran downward from the upper part of the sinus to ultimately join the anterior one. The main posterior alveolar canal ran through the lateral lower part of the sinus and communicated with the anterior one. Histological analyses demonstrated the existence of nerves and vessels in these canals/grooves, and the quantities of these structures varied across each canal/groove. Furthermore, the superior dental nerve plexus exhibited a network that was located horizontally to the occlusal plane, although these nerve plexuses appeared to be the vertical network that is described in most textbooks. In conclusion, cone-beam CT is suggested to be a useful method for clarifying the superior alveolar canals/grooves including the nerves and vessels.

  4. A Miniature-Based Image Retrieval System

    CERN Document Server

    Islam, Md Saiful

    2010-01-01

    Due to the rapid development of World Wide Web (WWW) and imaging technology, more and more images are available in the Internet and stored in databases. Searching the related images by the querying image is becoming tedious and difficult. Most of the images on the web are compressed by methods based on discrete cosine transform (DCT) including Joint Photographic Experts Group(JPEG) and H.261. This paper presents an efficient content-based image indexing technique for searching similar images using discrete cosine transform features. Experimental results demonstrate its superiority with the existing techniques.

  5. Acute Superior Mesenteric Venous Thrombosis: Transcatheter Thrombolysis and Aspiration Thrombectomy Therapy by Combined Route of Superior Mesenteric Vein and Artery in Eight Patients

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Shuofei, E-mail: yangshuofei@gmail.com; Liu, Baochen, E-mail: 306446264@qq.com; Ding, Weiwei, E-mail: dingwei-nju@hotmail.com; He, Changsheng, E-mail: hechsh@163.com; Wu, Xingjiang, E-mail: wuxingjiang@sohu.com; Li, Jieshou, E-mail: lijieshou2013@sohu.com [Research Institute of General Surgery, Jinling Hospital, Medical School of Nanjing University (China)

    2015-02-15

    PurposeTo assess the feasibility, effectiveness, and safety of catheter-directed thrombolysis and aspiration thrombectomy therapy by combined route of superior mesenteric vein and artery (SMV+SMA) for acute superior mesenteric venous thrombosis (ASMVT).MethodsThis retrospective study reviewed eight ASMVT patients with transcatheter direct thrombolysis and aspiration thrombectomy therapy via SMV and indirect thrombolysis via SMA during a period of 14 months. The demographics, etiology, risk factors, therapeutic effect, complications, mortality, and follow-up of the study population were assessed. Anatomic and imaging classification of location and extent of thrombus at diagnosis and degree of thrombus lysis were described.ResultsTechnical success was achieved with substantial improvement in symptoms and thrombus resolution after thrombolytic therapy in all patients. The local urokinase infusion by SMA and SMV was performed for 5–7 (6.13 ± 0.83) and 7–15 (12 ± 2.51) days. Anticoagulation was performed catheter-directed and then orally throughout hospitalization and after discharge. Four patients required delayed localized bowel resection after thrombolytic therapy with no death. Thrombolytic therapy was not interrupted despite minor bleeding at the puncture site in two patients and sepsis in another two postoperatively. Nearly complete removal of thrombus was demonstrated by contrast-enhanced CT scan and portography before discharge. Patients were discharged in 10–27 (19.25 ± 4.89) days after admission. No recurrence developed during the follow-up of 10–13 (12.13 ± 0.99) months.ConclusionsCatheter-directed thrombolytic and aspiration therapy via SMV+SMA is beneficial for ASMVT in avoiding patient death, efficient resolving thrombus, rapid improving symptoms, reversing extensive intestinal ischemia, averting bowel resection, or localizing infarcted bowel segment and preventing short bowel syndrome.

  6. Superior parathyroid gland approach to the recurrent laryngeal nerve.

    Science.gov (United States)

    Elsheikh, Ezzeddin

    2017-07-01

    The superior parathyroid gland is known to be almost constant in its location under the false thyroid capsule. Could it be a landmark to point to the site of incision of the false thyroid capsule and find the plane of the recurrent laryngeal nerve (RLN) during thyroidectomy? The study included 48 patients with benign goiter scheduled for hemithyroidectomy or total thyroidectomy; there were 16 cases of solitary thyroid nodules, 27 cases of multinodular goiter, and 5 cases of toxic goiter. This study included 80 lobectomies. All patients showed no evidence of postoperative RLN palsy, bleeding, or hypoparathyroidism. The superior parathyroid gland was consistently found within the false capsule in all cases, whereas the inferior parathyroid was found within the same layer in 64 sides (80%). The described approach can accurately guide dissection between true and false capsules of the thyroid to reach and preserve both the RLN and the superior parathyroid gland. © 2017 Wiley Periodicals, Inc. Head Neck 39: 1287-1290, 2017. © 2017 Wiley Periodicals, Inc.

  7. Hacia una educación superior inclusiva en Colombia

    Directory of Open Access Journals (Sweden)

    Sandra Lucia Arizabaleta Dominguez

    2016-12-01

    Full Text Available En este artículo se analizan concepciones teórico-conceptuales básicas que subyacen a la educación superior inclusiva, en el marco de los Lineamientos de la Política de Educación Superior Inclusiva del Ministerio de Educación Nacional de Colombia (men. Además, se plantean los desafíos que deben asumir las instituciones de educación superior (ies en la identificación de barreras de aprendizaje de su población estudiantil y la promoción de estrategias que garanticen la accesibilidad, permanencia, pertinencia académica y la graduación. Esta situación lleva a las ies a reflexionar y repensarse a partir de los procesos de autoevaluación institucional para crear estrategias participativas que promuevan la gestión inclusiva en un sistema educativo equitativo, pertinente y de calidad

  8. Anatomo-radiological study of the Superior Semicircular Canal Dehiscence

    Energy Technology Data Exchange (ETDEWEB)

    Crovetto, M., E-mail: macdlt@telefonica.net [Otolaryngology Department, Hospital de Basurto, University of the Basque Country, Avenida de Montevideo 18, Bilbao 48013, Vizcaya (Spain); Whyte, J., E-mail: jwhite@unizar.es [Faculty of Medicine, Department of Human Anatomy and Histology, University of Zaragoza, C/Domingo Mirall s/n, Zaragoza (Spain); Rodriguez, O.M., E-mail: OLIVIAMARIA.RODRIGUEZSANVICENT@osakidetza.net [Hospital de Cruces, Baracaldo, Vizcaya (Spain); Lecumberri, I., E-mail: INIGO.LECUMBERRICORTES@osakidetza.net [Hospital de Basurto, Avenida Montevideo 18, Bilbao 498013 (Spain); Martinez, C., E-mail: claudiorayosx@yahoo.es [Hospital General de la Defensa, Via Iberica s/n Zaragoza (Spain); Elexpuru, J., E-mail: jelexpuru@mac.com [Hospital de Basurto, Avenida de Montevideo 18, Bilbao 48013, Vizcaya (Spain)

    2010-11-15

    Introduction: The main purpose of this study is to determine the radiological incidence of Superior (SSCD) and Posterior Semicircular Canal Dehiscence (PSCD) and to compare radiologic SSCD to the incidence of this condition on cadaver specimen. We have also analysed the relation between the ossification state of the semicircular canals and the degree of mastoid pneumatization and integrity of Tegmen Tympani. Material and methods: Temporal bones have been investigated by means of CT scan on patients and direct observation on cadaver specimen, respectively. Results: 604 ears and 160 cadaver temporal bones have been investigated by means of CT scan and direct observation, respectively. 3.6% and 0.3% of the studied ears had SSCD and PSCD, respectively, on CT scan. Only 0.6% of the cadaver specimen ears did have anatomical SSCD. Degree of pneumatization of the mastoid bone is related to the mean thickness of bone overlying the Superior and Posterior Semicircular Canal. Radiological absence of Tegmen Tympani is more frequent in ears that also have radiologic SSCD. Conclusion: CT scanning gives higher incidence figures of SSCD than anatomical studies, 3.6% vs. 0.6%. We also found a 0.6% incidence of radiological PSCD in the studied ears. There is a direct relation between the degree of ossification of Superior and Posterior Semicircular Canal and certain temporal bone anatomic features: temporal bone pneumatization and absence/presence of Tegmen Tympani or Antri.

  9. Relative superiority analysis of Garut lamb and its crossbred

    Directory of Open Access Journals (Sweden)

    Ismeth Inounu

    2003-10-01

    Full Text Available The objective of the research was to evaluate the relative superiority of Garut lamb and its crosses with St. Croix and Moulton Charollais. The research was conducted at Animal Research Station, Indonesian Research Institute for Animal Production, Bogor, Indonesia. The data used for this paper was collected from 1995 to 2002. The results revealed that individual lamb weight at birth, at weaning, preweaning daily gain, at 6, 9 and 12 months of age of the composite sheep (HG = 50% St. Croix : 50% Garut, MG = 50% M. Charollais : 50% Garut, MHG (MG X HG dan HMG (HG X MG = 25% St. Croix : 25% M. Charollais : 50% Garut were higher than Garut sheep. The relative superiority were 6.7-13.1% for lamb weight at birth, 6.6- 15.6% for lamb weight at weaning, 3.2-20.8% for preweaning daily gain dan 6.2-17.9% for lamb weight at 9 month of age, respectively. The superiority of composite sheep were obtained in good and limited feed condition. Lamb growth parameters were also affected by feed condition, parity, sex, and rearing type.

  10. Superior metallic alloys through rapid solidification processing (RSP) by design

    Energy Technology Data Exchange (ETDEWEB)

    Flinn, J.E. [Idaho National Engineering Laboratory, Idaho Falls, ID (United States)

    1995-05-01

    Rapid solidification processing using powder atomization methods and the control of minor elements such as oxygen, nitrogen, and carbon can provide metallic alloys with superior properties and performance compared to conventionally processing alloys. Previous studies on nickel- and iron-base superalloys have provided the baseline information to properly couple RSP with alloy composition, and, therefore, enable alloys to be designed for performance improvements. The RSP approach produces powders, which need to be consolidated into suitable monolithic forms. This normally involves canning, consolidation, and decanning of the powders. Canning/decanning is expensive and raises the fabrication cost significantly above that of conventional, ingot metallurgy production methods. The cost differential can be offset by the superior performance of the RSP metallic alloys. However, without the performance database, it is difficult to convince potential users to adopt the RSP approach. Spray casting of the atomized molten droplets into suitable preforms for subsequent fabrication can be cost competitive with conventional processing. If the fine and stable microstructural features observed for the RSP approach are preserved during spray casing, a cost competitive product can be obtained that has superior properties and performance that cannot be obtained by conventional methods.

  11. Stomatitis sub-prosthesis in patients with superior dental prosthesis

    Directory of Open Access Journals (Sweden)

    Antonia Martina Francisco Local

    2009-04-01

    Full Text Available Background: The stomatitis sub-prosthesis is one of the most frequent changes in hard palate mucous membrane in patients with mucous-supported dental prosthesis. It can be caused by multiple factors, which makes its study and prognosis more difficult. Objective: To describe the occurrence of stomatitis sub-prosthesis and its causes in patients with superior dental prosthesis. Method: Descriptive study including all the patients with superior dental prosthesis examined in the odontology consultation “Barrio Adentro” in the state of Miranda, Venezuela, from November, 2005 to March, 2006. The analysed variables were: age, sex, stomatitis level, teeth brushing frequency, prosthesis condition and use, palate mucous condition and frequency of odontology consultations. Results: 89 patients were attended, more 50% of them had superior dental prosthesis and presented stomatitis sub-prosthesis; the group between 35 and 59 years was the most affected, mainly females. Sub-prosthesis stomatitis type II was the most common and the main causes included constant use of the prosthesis and loose prosthesis. Buccal hygiene was not adequate in these patients. Most of them declared never attending to the dentist, or just when presenting some particular problem. Conclusion: Stomatitis prevalence was related with incorrect hygiene habits and lack of knowledge; it shows the importance of performing educative tasks to reduce this disease incidence.  

  12. Water quality of streams tributary to Lakes Superior and Michigan

    Science.gov (United States)

    Zimmerman, Jerome W.

    1968-01-01

    Water quality of streams tributary to Lakes Superior and Michigan was analyzed for 142 stations on 99 streams tributary to Lake Superior and 83 stations on 56 streams tributary to Lake Michigan during 1962-65. Concentrations of aluminum, copper, and iron were not affected greatly by flow or season. Magnesium, calcium, chlorides, total alkalinity, total hardness, and conductivity varied with the flow, temperature, and season; the lowest values were during the spring runoff and heavy rains, and the highest were during low water in late summer and the colder periods of winter. Concentrations of nitrate, silica, and sulfates were lowest in the spring and summer. Concentrations of tanninlike and ligninlike compounds were highest during the spring runoff and other high-water periods, and were lowest during freezeup when surface runoff was minimal. The pH values were highest from June to September and lowest during the spring runoff. Phenolphthalein alkalinity was detected primarily in the summer and coincided occasionally with low flows just before the spring thaw. Total hardness usually was lower in streams tributary to Lake Superior than in streams tributary to Lake Michigan. The total hardness was higher in the streams in Wisconsin than in the streams in Michigan along the west shore of Lake Michigan. It was lowest in the northernmost streams. The water quality of the streams in an area was related to the geological characteristics of the land.

  13. Cooperation between ligninolytic enzymes produced by superior mixed flora

    Institute of Scientific and Technical Information of China (English)

    WANG Hai-lei; LI Zong-yi; GUO Wei-yun; WANG Zhen-yu; PAN Feng

    2005-01-01

    Since the ability to degrade lignin with one kind of white-rot fungi or bacteria was very limited, superior mixed flora's ability to degrade lignin was investigated by an orthogonal experiment in this paper. The results showed that superior mixed flora reinforced the ability to degrade lignin, the degradation rates of both sample 9 and 10 were beyond 80% on the day 9. The cooperation between lignin peroxidase(LiP), Mn-dependent peroxidase(MnP) and laccase (Lac) for lignin degradation was also studied. By examining the activities of three enzymes produced by superior mixed flora, it was found that Lac was a key enzyme in the process of biological degradation of lignin but Lip was not; the enzyme activity ratios of Lac/MnP and Lac/LiP were significantly correlative with the degradation rate of lignin at the 0.01 level; and the ratio of MnP/LiP was an important factor affecting the degradation rate of lignin.

  14. Preference for Audiovisual Speech Congruency in Superior Temporal Cortex.

    Science.gov (United States)

    Lüttke, Claudia S; Ekman, Matthias; van Gerven, Marcel A J; de Lange, Floris P

    2016-01-01

    Auditory speech perception can be altered by concurrent visual information. The superior temporal cortex is an important combining site for this integration process. This area was previously found to be sensitive to audiovisual congruency. However, the direction of this congruency effect (i.e., stronger or weaker activity for congruent compared to incongruent stimulation) has been more equivocal. Here, we used fMRI to look at the neural responses of human participants during the McGurk illusion--in which auditory /aba/ and visual /aga/ inputs are fused to perceived /ada/--in a large homogenous sample of participants who consistently experienced this illusion. This enabled us to compare the neuronal responses during congruent audiovisual stimulation with incongruent audiovisual stimulation leading to the McGurk illusion while avoiding the possible confounding factor of sensory surprise that can occur when McGurk stimuli are only occasionally perceived. We found larger activity for congruent audiovisual stimuli than for incongruent (McGurk) stimuli in bilateral superior temporal cortex, extending into the primary auditory cortex. This finding suggests that superior temporal cortex prefers when auditory and visual input support the same representation.

  15. Superior Pattern Processing is the Essence of the Evolved Human Brain

    Directory of Open Access Journals (Sweden)

    Mark eMattson

    2014-08-01

    Full Text Available Humans have long pondered the nature of their mind/brain and, particularly why its capacities for reasoning, communication and abstract thought are far superior to other species, including closely related anthropoids. This article considers superior pattern processing (SPP as the fundamental basis of most, if not all, unique features of the human brain including intelligence, language, imagination, invention, and the belief in imaginary entities such as ghosts and gods. SPP involves the electrochemical, neuronal network-based, encoding, integration, and transfer to other individuals of perceived or mentally-fabricated patterns. During human evolution, pattern processing capabilities became increasingly sophisticated as the result of expansion of the cerebral cortex, particularly the prefrontal cortex and regions involved in processing of images. Specific patterns, real or imagined, are reinforced by emotional experiences, indoctrination and even psychedelic drugs. Impaired or dysregulated SPP is fundamental to cognitive and psychiatric disorders. A broader understanding of SPP mechanisms, and their roles in normal and abnormal function of the human brain, may enable the development of interventions that reduce irrational decisions and destructive behaviors.

  16. New human-specific brain landmark: the depth asymmetry of superior temporal sulcus.

    Science.gov (United States)

    Leroy, François; Cai, Qing; Bogart, Stephanie L; Dubois, Jessica; Coulon, Olivier; Monzalvo, Karla; Fischer, Clara; Glasel, Hervé; Van der Haegen, Lise; Bénézit, Audrey; Lin, Ching-Po; Kennedy, David N; Ihara, Aya S; Hertz-Pannier, Lucie; Moutard, Marie-Laure; Poupon, Cyril; Brysbaert, Marc; Roberts, Neil; Hopkins, William D; Mangin, Jean-François; Dehaene-Lambertz, Ghislaine

    2015-01-27

    Identifying potentially unique features of the human cerebral cortex is a first step to understanding how evolution has shaped the brain in our species. By analyzing MR images obtained from 177 humans and 73 chimpanzees, we observed a human-specific asymmetry in the superior temporal sulcus at the heart of the communication regions and which we have named the "superior temporal asymmetrical pit" (STAP). This 45-mm-long segment ventral to Heschl's gyrus is deeper in the right hemisphere than in the left in 95% of typical human subjects, from infanthood till adulthood, and is present, irrespective of handedness, language lateralization, and sex although it is greater in males than in females. The STAP also is seen in several groups of atypical subjects including persons with situs inversus, autistic spectrum disorder, Turner syndrome, and corpus callosum agenesis. It is explained in part by the larger number of sulcal interruptions in the left than in the right hemisphere. Its early presence in the infants of this study as well as in fetuses and premature infants suggests a strong genetic influence. Because this asymmetry is barely visible in chimpanzees, we recommend the STAP region during midgestation as an important phenotype to investigate asymmetrical variations of gene expression among the primate lineage. This genetic target may provide important insights regarding the evolution of the crucial cognitive abilities sustained by this sulcus in our species, namely communication and social cognition.

  17. Skull fracture with effacement of the superior sagittal sinus following drone impact: a case report.

    Science.gov (United States)

    Chung, Lawrance K; Cheung, Yuri; Lagman, Carlito; Au Yong, Nicholas; McBride, Duncan Q; Yang, Isaac

    2017-06-22

    The popularity of unmanned aerial vehicles, or drones, raises safety concerns as they become increasingly common for commercial, personal, and recreational use. Collisions between drones and people may result in serious injuries. A 13-year-old male presented with a comminuted depressed skull fracture causing effacement of the superior sagittal sinus secondary to a racing drone impact. The patient experienced a brief loss of consciousness and reported lower extremity numbness and weakness after the accident. Imaging studies revealed bone fragments crossing the superior sagittal sinus with a short, focal segment of blood flow interruption. Neurosurgical intervention was deferred given the patient's improving neurological deficits, and the patient was treated conservatively. He was discharged home in stable condition. Drones may represent a hazard when operated inappropriately due to their capacity to fly at high speeds and altitudes. Impacts from drones can carry enough force to cause skull fractures and significant head injuries. The rising popularity of drones likely translates to an increased incidence of drone-related injuries. Thus, clinicians should be aware of this growing trend.

  18. Pneumomediastinum and the aortic nipple: the clinical relevance of the left superior intercostal vein.

    Science.gov (United States)

    Walters, Andy; Cassidy, Lindsey; Muhleman, Mitchel; Peterson, Ashley; Blaak, Christa; Loukas, Marios

    2014-07-01

    This article discusses the appearance of the "aortic nipple" in chest radiography, and reviews the embryology and anatomy of the left superior intercostal vein which causes the appearance of an "aortic nipple." This radiological sign is useful in differentiating certain thoracic pathologies, such as pneumomediastinum, pneumopericardium, and medial pneumothorax. Pneumomediastinum is an encompassing term describing the presence of air in the mediastinum, and may arise from a wide range of pathological conditions. Despite the well-described imaging of pneumomediastinum, it is sometimes difficult to differentiate from other conditions such as pneumopericardium and medial pneumothorax. A separate finding, "aortic nipple" is the radiographic term used to describe the lateral nipple-like projection from the aortic knob present in a small number of individuals. The aortic nipple corresponds to the end-on appearance of the left superior intercostal vein coursing around the aortic knob, and may be mistaken radiologically for lymphadenopathy or a neoplasm. Despite their relative independence, the aortic nipple is defined by new contours in cases of pneumomediastinum, taking on an "inverted aortic nipple" appearance. In this position, the inverted aortic nipple may facilitate radiographic discrimination of pneumomediastinum from similar conditions. This study aims to review the common clinical and radiographic features of both pneumomediastinum and the aortic nipple. The radiologic appearance of the aortic nipple occurring in unison with pneumomediastinum, and its potential role as a tool in the differentiation of pneumomediastinum from similarly presenting conditions will also be described. Copyright © 2013 Wiley Periodicals, Inc.

  19. Bilateral Superior Labrum Anterior to Posterior (SLAP) Tears With Abnormal Anatomy of Biceps Tendon.

    Science.gov (United States)

    Morris, Dan; Guettler, Joseph; Morris, Sean

    2015-08-01

    There have been several descriptions of variant anatomy of the long head of the biceps tendon (LHBT). A recent literature review identified 8 cases of anomalous intracapsular attachment of the LHBT. In this report, we discuss a distinctive case of a young athlete who presented with symptoms consistent with bilateral superior labrum anterior to posterior (SLAP) tears that were unresponsive to conservative measures. Magnetic resonance imaging and arthroscopic findings of this patient confirmed that the patient had type II SLAP tears, a Buford complex anteriorly, and perhaps most important, confluence of the biceps tendon itself to the undersurface of the capsule within the rotator interval. Our case proposes that anomalous insertion of the LHBT, as well as other labral and biceps anchor variations, are not always a benign finding at the time of arthroscopy. In this particular case, the tethering of the biceps tendon to the capsule is thought to have increased stress on the superior labrum and contributed to the development of the bilateral symptomatic type II SLAP tears that were identified and treated in this young athlete.

  20. Síndrome da artéria mesentérica superior Superior mesenteric artery syndrome

    OpenAIRE

    Haberlandh Sodré Lima; Accyoli Moreira Maia; Antonio Kneipp Pitta de Castro Neto

    2000-01-01

    The Superior Mesenteric Syndrome is a rare and controversial disease. The compression of the duodenum by the mesenteric artery and aorta causes an intermitent obstruction. Preoperative diagnosis is very difficult.We present one case of this syndrome in a pacient with severe weight loss and signs of high intestinal obstruction. The diagnosis was based on clinical and radiologic findings. A duodenojejunostomy was performed after medical treatment failure.This patient died on the 20th posoperati...

  1. Isolated superior mesenteric artery dissection: case for conservative treatment and endovascular repair

    Institute of Scientific and Technical Information of China (English)

    WU Bin; ZHANG Jian; YIN Ming-di; WANG Lei; SONG Jin-qiu; LI Xuan; YANG Dong; DUAN Zhi-quan; XIN Shi-jie

    2009-01-01

    @@ Dissection of the superior mesenteric artery (SMA) not associated aortic dissection is an uncommon event. The pathogenesis remains unclear. Diagnosis has become more efficient due to recent advances in imaging techniques and increased awareness of mesenteric vessel diseases. Early recognition has led to early interventions. Although there is still no consensus on the best option of management for this disease, an increasing number of patients in recent years have been reported to be treated successfully by non-operative approaches (medical therapy and/or percutaneous endovascular repair) rather than operations. We report the diagnosis and non-operative managements of isolated dissection of SMA in the acute stage in two cases at the First Hospital of China Medical University from October to December in 2006.

  2. White Matter Microstructural Organization Is Higher with Age in Adult Superior Cerebellar Peduncles.

    Science.gov (United States)

    Kanaan, Richard A; Allin, Matthew; Picchioni, Marco M; Shergill, Sukhwinder S; McGuire, Philip K

    2016-01-01

    Using diffusion tensor imaging, we conducted an exploratory investigation of the relationship between white matter tract microstructure and age in 200 healthy adult subjects using tract-based spatial statistics (TBSS). Though most tracts showed the slight decline in microstructural organization with age widely noted, in both superior cerebellar peduncles (SCP) it correlated positively with age, a result not previously reported. We confirmed this by using an alternative method, and by repeating our TBSS analysis in an additional sample of 133 healthy adults. In exploring this surprising result we considered the possibility that this might arise from the continual cognitive and motor refinement that is enacted in the cerebellum: we found that tract microstructure in both SCPs was also strongly correlated with IQ, again in contrast with all other tracts, and its relationship with age mediated by IQ, as a training model would predict.

  3. White matter microstructural organisation is higher with age in adult Superior Cerebellar Peduncles alone

    Directory of Open Access Journals (Sweden)

    Richard eKanaan

    2016-04-01

    Full Text Available Using diffusion tensor imaging, we conducted an exploratory investigation of the relationship between white matter tract microstructure and age in 200 healthy subjects using tract-based spatial statistics (TBSS. Though most tracts showed the slight decline widely noted, microstructural organization in both superior cerebellar peduncles (SCP correlated positively with age, a result not previously reported. We confirmed this by using an alternative method, and by repeating our TBSS analysis in an additional sample of 133 healthy subjects. In exploring this surprising result we considered the possibility that this might arise from the continual cognitive and motor refinement that is enacted in the cerebellum: we found that tract microstructure in both SCPs was also strongly correlated with IQ, again in contrast with all other tracts, and its relationship with age mediated by IQ, as a training model would predict.

  4. Brain morphology and neuropsychological profiles in a family displaying dyslexia and superior nonverbal intelligence.

    Science.gov (United States)

    Craggs, Jason G; Sanchez, Juliana; Kibby, Michelle Y; Gilger, Jeffrey W; Hynd, George W

    2006-11-01

    Behavioral research suggests that individuals with dyslexia may have exceptional skills in nonverbal cognitive processes, while genetic studies have noted that giftedness, high IQ and/or special talents tend to run in families. Taken together, these results suggest that persons within families (particularly offspring) may share similar cortical systems supporting those functions. Postmortem and in vivo imaging studies have linked dyslexia to abnormalities in the structures associated with the parietal operculum (PO) (e.g., planum temporale, supramarginal gyrus, and angular gyrus). In this paper we present data on a single family showing a link between dyslexia, superior nonverbal IQ and atypical PO presentation. We consider the psychometric and neurological patterns of this family as a tentative etiological test of the putative dyslexia-talent association.

  5. Polyvinylpyrrolidone (PVP)-capped Pt Nanocubes with Superior Peroxidase-like Activity

    Energy Technology Data Exchange (ETDEWEB)

    Ye, Haihang; Liu, Y.; chhabra, ashima; lilla, emily; xia, xiaohu

    2017-01-01

    Peroxidase mimics of inorganic nanoparticles are expected to circumvent the inherent issues of natural peroxidases, providing enhanced performance in important applications such as diagnosis and imaging. Despite the report of a variety of peroxidase mimics in the past decade, very limited progress has been made on improving their catalytic efficiency. The catalytic efficiencies of most previously reported mimics are only up to one order of magnitude higher than those of natural peroxidases. In this work, we demonstrate a type of highly efficient peroxidase mimic – polyvinylpyrrolidone (PVP)-capped Pt nanocubes of sub-10 nm in size. These PVP-capped Pt cubes are ~200-fold more active than the natural counterparts and exhibit a record-high specific catalytic efficiency. In addition to the superior efficiency, the new mimic shows several other promising features, including excellent stabilities, well-controlled uniformity in both size and shape, controllable sizes, and facile and scalable production.

  6. A giant neuroendocrine tumor of the thymus gland causing superior vena cava syndrome.

    Science.gov (United States)

    Komoda, Satsuki; Komoda, Takeshi; Knosalla, Christoph; Pavel, Marianne E; Morawietz, Lars; von Weikersthal, Ludwig Fischer; Lehmkuhl, Hans B; Hetzer, Roland

    2012-12-01

    We describe the case of a 37-year-old man with a rare giant thymic neuroendocrine tumor. The patient presented with a swelling of the neck associated with superior vena cava syndrome and underwent stent implantation in the right innominate vein (brachiocephalic vein). Computed tomography imaging revealed a large tumor of the mediastinum, measuring 15 × 10 × 12 cm. CT-guided core-needle biopsy for histology revealed a thymic carcinoid. Surgical resection of the tumor and repair with interposition of a 14-mm Gore-Tex prosthesis between the left innominate vein and the right atrial appendage were performed. Histopathological analysis classified the tumor as an atypical thymic carcinoid. Postoperative course was uneventful. Since complete resection could not be achieved, the patient received two cycles of peptide-receptor radionuclide therapy followed by conventional radiotherapy, and remains symptom-free at 12 months after surgery.

  7. Detection of Superior Vena Cava Obstruction on Dynamic 99mTc-DTPA Renal Transplant Scintigraphy

    Directory of Open Access Journals (Sweden)

    Elahe Pirayesh

    2016-02-01

    Full Text Available We present an asymptomatic patient with a history of prolonged hemodialysis through a right internal jugular vein catheter who was diagnosed with superior vena cava (SVC obstruction on 99mTechnetium-diethylenetriaminepentaacetic acid renal transplant scintigraphy. During the angiographic phase, an unusual vascular filling pattern was detected on the anterior view of the abdomen. Angioscintigraphic imaging of the chest wall was suggestive of SVC obstruction. The SVC obstruction in our patient was related to the long-term use of an indwelling catheter in the central venous system, which is a well-known complication of such a procedure. There is also evidence of a hypercoagulable state in dialyzed uremic cases; therefore, our patient may have been more susceptible to an SVC thrombosis. Acquired compensatory dilatation of the azygos vein is rather a rare finding. To the best of our knowledge, this is the first report describing an asymptomatic patient with SVC obstruction who was diagnosed by renal scintigraphy.

  8. Giant saphenous vein graft pseudoaneurysm to right posterior descending artery presenting with superior vena cava syndrome

    Institute of Scientific and Technical Information of China (English)

    Andres; Vargas-Estrada; Dianna; Edwards; Mohammad; Bashir; James; Rossen; Firas; Zahr

    2015-01-01

    Saphenous vein grafts(SVG) pseudoaneurysms,especially giant ones,are rare and occur as a late complication of coronary artery bypass grafting. This condition affects both genders and typically occurs within the sixth decade of life. The clinical presentation ranges from an asymptomatic incidental finding on imaging studies to new onset angina,dyspnea,myocardial infarction or symptoms related to compression of neighboring structures. An 82-year-old woman presented with acute onset back pain,dyspnea and was noted to have significantly engorged neck veins. In the emergency department,a chest computed tomographic angiogram with intravenous contrast revealed a ruptured giant bilobed SVG pseudoaneurysm to the right posterior descending artery(RPDA). This imaging modality also demonstrated compression of the superior vena cava(SVC) by the SVG pseudoaneurysm. Coronary angiogram with bypass study was performed to establish the patency of this graft. Endovascular coiling and embolization of the SVG to RPDA was initially considered but disfavored after the coronary angiogram revealed preserved flow from the graft to this arterial branch. After reviewing the angiogram films,a surgical strategy was favored over a percutaneous intervention with a Nitinol self-expanding stent since the latter would have not addressed the superior vena cava compression caused by the giant pseudoaneurysm. Intraoperative transesophageal echocardiogram demonstrated SVCcompression by the giant pseudoaneurysm cranial lobe. Our patient underwent surgical ligation and excision of the giant pseudoaneurysm and the RPDA was regrafted successfully. In summary,saphenous vein grafts pseudoaneurysms can be life-threatening and its therapy should be guided based on the presence of mechanical complications,the patency of the affected vein graft and the involved myocardial territory viability.

  9. Vowel-specific mismatch responses in the anterior superior temporal gyrus: an fMRI study.

    Science.gov (United States)

    Leff, Alexander P; Iverson, Paul; Schofield, Thomas M; Kilner, James M; Crinion, Jennifer T; Friston, Karl J; Price, Cathy J

    2009-04-01

    There have been many functional imaging studies that have investigated the neural correlates of speech perception by contrasting neural responses to speech and "speech-like" but unintelligible control stimuli. A potential drawback of this approach is that intelligibility is necessarily conflated with a change in the acoustic parameters of the stimuli. The approach we have adopted is to take advantage of the mismatch response elicited by an oddball paradigm to probe neural responses in temporal lobe structures to a parametrically varied set of deviants in order to identify brain regions involved in vowel processing. Thirteen normal subjects were scanned using a functional magnetic resonance imaging (fMRI) paradigm while they listened to continuous trains of auditory stimuli. Three classes of stimuli were used: 'vowel deviants' and two classes of control stimuli: one acoustically similar ('single formants') and the other distant (tones). The acoustic differences between the standard and deviants in both the vowel and single-formant classes were designed to match each other closely. The results revealed an effect of vowel deviance in the left anterior superior temporal gyrus (aSTG). This was most significant when comparing all vowel deviants to standards, irrespective of their psychoacoustic or physical deviance. We also identified a correlation between perceptual discrimination and deviant-related activity in the dominant superior temporal sulcus (STS), although this effect was not stimulus specific. The responses to vowel deviants were in brain regions implicated in the processing of intelligible or meaningful speech, part of the so-called auditory "what" processing stream. Neural components of this pathway would be expected to respond to sudden, perhaps unexpected changes in speech signal that result in a change to narrative meaning.

  10. THE HUMAN SUBJECTIVITY BETWEEN THE SUPERIOR AND INFERIOR TYPES A SUBJETIVIDADE HUMANA ENTRE OS TIPOS SUPERIORES E INFERIORES

    Directory of Open Access Journals (Sweden)

    Vagner Silva

    2011-12-01

    Full Text Available This article attempts to solve the following contradiction of Nietzsche's thought: man has a subjective drive constitution, these drives, however, are individuals, and its being (the being of the drives, is constituted for more power fight (the will to power. Nietzsche's superior man (educated and cultivated man is that one, in which there is harmony in the drives, who can give greater freedom to its most terrible drives, without, however, loses the control over them. That is the contradiction: if man has to control the drives, they are not harmonics. There is incompatibility between harmony and control. In other words, the superior man is indeed the man of culture and cultivated man of Nietzsche? If the answer to this question is yes, then, in this man, reigns the drives harmony. If, on the other hand, the answer is no, then, for this man does not become a barbarian destroyer, dangerous to himself and to others it is necessary that a drive dominates the others. However it is not possible to escape the contradiction: either there is harmony in human drive or control.Este artigo busca resolver a seguinte contradição do pensamento de Nietzsche: o homem possui uma constituição subjetiva pulsional, estas pulsões, porém, são individuais, e o seu ser, o das pulsões, constitui-se da luta por mais poder (vontade de poder. O homem superior de Nietzsche (homem culto e cultivado é aquele no qual há harmonia nas pulsões, aquele que pode dar mais liberdade às suas mais terríveis pulsões, sem, no entanto, perder o controle sobre elas. Eis a contradição: se o homem superior exerce controle sobre as pulsões então elas não são harmônicas. Há, aqui, a incompatibilidade entre harmonia e controle. Em outros termos: o homem superior é de fato o homem culto e cultivado de Nietzsche? Se a resposta para esta pergunta for sim, então neste homem reina a harmonia pulsional. Se, por outro lado, a resposta for não, então, para que este homem n

  11. MR imaging of the brachial plexus.

    Science.gov (United States)

    Posniak, H V; Olson, M C; Dudiak, C M; Wisniewski, R; O'Malley, C

    1993-08-01

    The brachial plexus is difficult to evaluate with conventional radiologic techniques, including CT. However, it is well shown by MR imaging, which has direct multiplanar imaging capability and superior soft-tissue resolution [1-4]. We present our technique for evaluating the brachial plexus, discuss the anatomy, and illustrate normal and abnormal findings.

  12. Japanese Advanced Meteorological Imager

    Science.gov (United States)

    Puschell, Jeffery J.; Lowe, Howard A.; Jeter, James W.; Kus, Steven M.; Osgood, Roderic; Hurt, W. Todd; Gilman, David; Rogers, David L.; Hoelter, Roger L.; Kamel, Ahmed

    2005-01-01

    The Japanese Advanced Meteorological Imager (JAMI) was developed by Raytheon and delivered to Space Systems/Loral as the Imager Subsystem for Japan's MTSAT-1R satellite. Due to Japan's urgent need to replace MTSAT-1, which was destroyed in a launch failure in 1999, JAMI was developed on an expeditious 39-month schedule. Raytheon's success in responding to the needs of MTSAT-1R and delivering an excellent operational geosynchronous Earth orbit (GEO) imager was enabled by an elegant instrument architecture and use of newer but proven technology that simplified design, assembly and test of the Imager while simultaneously supplying superior performance. JAMI breaks through limitations of earlier three-axis stabilized GEO instruments with significant improvements in many areas, including spatial sampling, radiometric sensitivity, calibration and performance around local midnight.

  13. Superior facet syndrome. Findings on metrizamide CT myelography

    Energy Technology Data Exchange (ETDEWEB)

    Kubo, Yoshichika; Igarashi, Seishi; Koyama, Tsunemaro

    1985-02-01

    Sciatica caused by root entrapment in the lateral recess was named superior facet syndrome by Epstein in 1972. Few reports on this subject based on large numbers of cases have been documented to date. Of the patients with sciatica, 32 patients were diagnosed to have root entrapment at the lateral recess L5 or/and S1 lumbar spine. Out of 32 patients, 20 patients were operated on and the lateral entrapment was recognized in all of surgical cases. Neuroradiological findings, especially of metrizamide CT (met. CT), were documented in detail. Thirty two patients were classified in three types according to radiological findings. They were congenital or developmental, degenerative, and combined type, respectively. Fourteen cases belonged to the congenital type, 13 to the degenerative and 5 to the combined type. Each group had the mean ages of 23.4, 53.8, and 36.8 years old, respectively. Of 32 cases the entrapment occured in 47 L5 roots and 11 S1 roots. There was no remarkable laterality. In operation the unroofing of the lateral recess were done and the sciatica subsided postoperatively in all of surgical cases. Met. CT revealed extreme medial protrusion of the superior articular joint in 18 of 24 cases(75%) and none filling of the root in the lateral recess in 21 of 24 cases (87.5%). In the degenerative type, met. CT showed some degenerative changes that were hypertrophy or deformity of the articular joints and spur formation of the vertebral body. In contrast to met. CT, metrizamide myelography revealed only slight changes, which were poor filling of the root before it turned out the pedicle of lateral compression of the root. In plain films or lumbar spine articular joints at Lsub(4/5) were formed in coronal plane in 69% of cases of the L5 root entrapment. Met. CT using ReView technique was of great diagnostic value in superior facet syndrome.

  14. QUAL DEMOCRATIZAÇÃO DO ENSINO SUPERIOR?

    Directory of Open Access Journals (Sweden)

    François Dubet

    Full Text Available Esse artigo, resultante de uma conferência, discute traços do processo de democratização do ensino superior. Procura distinguir analiticamente várias dimensões da democratização, baseadas, por sua vez, em concepções diferentes da justiça: igualdade de oportunidades, meritocracia, utilidades e equidade dos procedimentos. Cada sociedade constrói modelos de democratização desse ensino. A massificação do ensino superior desempenhou papel democrático objetivo, favorável aos grupos sociais antes excluídos. Mas massificação não equivale à democratização. Todas as categorias sociais não se beneficiam da mesma forma da massificação. A democratização do acesso ao ensino superior não depende apenas das famílias. Depende também da estrutura geral do sistema educativo. A meritocracia acadêmica constrói uma hierarquia de competências que é também social, com forte impacto reprodutivo. As desigualdades de utilidade das diferentes formações têm impacto sobre o conjunto das desigualdades sociais. Os sistemas educativos implementam distintos procedimentos de seleção, de concessão de gratuidades, bolsas e auxílios, que podem ser considerados como mais ou menos equitativos segundo as normas de justiça que mobilizam.

  15. Lipid peroxidation following superior mesenteric artery occlusion in rat intestine

    Directory of Open Access Journals (Sweden)

    P. Pasbakhsh

    2006-07-01

    Full Text Available Background: The aim of this study was to determine the level of lipid peroxidation and tissue protein after superior mesenteric artery occlusion tissue damage. The effect of melatonin as anti oxidant and free radical scavenger in prevention of tissue damage, were also evaluated. Methods: Thity six young male Wisatr-Albino rats (weight: 80-120 gr, were divided equally in 6 group with different concentrations of melatonin (10,20,30 mg/kg treatment. Group 1was control, group 2 the sham that surgical process was applied until superior mesenteric artery dissection and received vehicle solution only in equally volume by intra muscular route. Group 3 was ischemia- reperfusion (I/R, group 4 was I/R plus melatonin 10 mg/kg, group 5 I/R plus melatonin 20 mg/kg and finally group 6 I/R plus melatonin 30 mg/kg. After laparatomy, a microvascular atraumatic clip was placed across the superior mesenteric artery under general anaesthesia and itbremoved after ischemia for 30 minutes. The first dose of melatonin was applied just beforereperfusion, second dose, after reperfusion and third dose on the second day .On third day rats were killed and their bowels were removed. The level of tissue melandialdehyde (MDA as index of lipid peroxidation and tissue protein was determined. Results: The level of tissue MDA were significantly lower in group 4, 5, 6 than group 3 (p0, 05. Conclusion: These results suggest that melatonin 10 mg/kg has antioxidant effect in prevention of inducing tissue damage during SMA occlusion in rat intestine.

  16. LA EDUCACIÓN SUPERIOR CUBANA: LOGROS Y PERSPECTIVAS

    Directory of Open Access Journals (Sweden)

    Acela Cantero Zayas

    Full Text Available Resumen: El impetuoso desarrollo de la ciencia y la técnica contemporâneo en general y muy específicamente en la realidad cubana, estâ dirigido a satisfacer las necesidades creciente de nuestra sociedad, lo que conlleva a un continuo perfeccionamiento de todo el sistema educativo en correspondencia con las exigencias, demandas y necesidades de nuestro pueblo. En tal sentido, para comprender los resultados que exhibe la Educación cubana y dentro de ella la Educación Superior, se precisa de toda una reflexión histórica, como soporte lógico y metodológico del hecho educativo cubano. En la actualidad, el mayor impacto de nuestra Educación Superior, desde los puntos de vista social, político, económico y en especial formativo, lo constituye, el diseno e implementación del modelo de Universalización, el cual tiene como objetivo supremo la extensión de la Universidad a los distintos municipios del país, con la finalidad de irradiar cultura y saber, que son las únicas modalidades de garantizar un hombre libre y de hecho una sociedad independiente. En el presente trabajo se muestra una panorâmica de la Educación Superior en Cuba, partiendo del elemento histórico hasta la contemporaneidad y en ésta, los nuevos retos impuestos por el contexto socio-político a escala mundial.

  17. LA EDUCACIÓN SUPERIOR CUBANA: LOGROS Y PERSPECTIVAS

    Directory of Open Access Journals (Sweden)

    Acela Cantero Zayas

    2004-01-01

    Full Text Available El impetuoso desarrollo de la ciencia y la técnica contemporáneo en general y muy específicamente en la realidad cubana, está dirigido a satisfacer las necesidades creciente de nuestra sociedad, lo que conlleva a un continuo perfeccionamiento de todo el sistema educativo en correspondencia con las exigencias, demandas y necesidades de nuestro pueblo. En tal sentido, para comprender los resultados que exhibe la Educación cubana y dentro de ella la Educación Superior, se precisa de toda una reflexión histórica, como soporte lógico y metodológico del hecho educativo cubano. En la actualidad, el mayor impacto de nuestra Educación Superior, desde los puntos de vista social, político, económico y en especial formativo, lo constituye, el diseño e implementación del modelo de Universalización, el cual tiene como objetivo supremo la extensión de la Universidad a los distintos municipios del país, con la finalidad de irradiar cultura y saber, que son las únicas modalidades de garantizar un hombre libre y de hecho una sociedad independiente. En el presente trabajo se muestra una panorámica de la Educación Superior en Cuba, partiendo del elemento histórico hasta la contemporaneidad y en ésta, los nuevos retos impuestos por el contexto socio-político a escala mundial.

  18. Infantile intracranial aneurysm of the superior cerebellar artery.

    Science.gov (United States)

    Del Santo, Molly Ann; Cordina, Steve Mario

    2016-02-29

    Intracranial aneurysms in the pediatric population are rare. We report a case of a 3-month-old infant who presented with inconsolable crying, vomiting, and sunset eye sign. CT revealed a subarachnoid hemorrhage, with CT angiogram revealing a superior cerebellar artery aneurysm. An external ventricular drain was placed for acute management of hydrocephalus, with definitive treatment by endovascular technique with a total of six microcoils to embolize the aneurysm. Serial transcranial Dopplers revealed no subsequent vasospasm. Although aneurysms in the pediatric population are rare, once the diagnosis is established, early treatment results in better outcomes. 2016 BMJ Publishing Group Ltd.

  19. CALIDAD Y EXPERIENCIA DOCENTE EN EDUCACIÓN SUPERIOR

    Directory of Open Access Journals (Sweden)

    María Isabel Lafuente Guantes

    2010-01-01

    Full Text Available En este trabajo se considera la forma de entender la calidad en la experiencia docente en educación superior a partir de la práctica del profesorado, y en relación con las orientaciones educativas hoy al uso. Se analiza en tres trabajos: las nociones en que se basa esta experiencia, su valor en el proceso docente, qué condiciones se requieren para lograr que la creencia en la calidad alcance su efectuación.

  20. A standardized surgical technique for rat superior cervical ganglionectomy

    DEFF Research Database (Denmark)

    Savastano, Luis Emilio; Castro, Analía Elizabeth; Fitt, Marcos René

    2010-01-01

    injury. Despite having several experimental applications in the rat, a thorough description of a standardized procedure has never been published. Here, we provide a brief review of the principal features and experimental uses of the SCGx, the surgical anatomy of the neck and sympathetic cervical chain......, and a step-by-step description of how to consistently remove the superior cervical ganglia through the omohyoid muscle or the carotid triangle. Furthermore, we suggest procedures and precautions to be taken during and after surgery to optimize results and describe tools to validate surgical success. We...

  1. Superior Valley photovoltaic power processing and system controller evaluation

    Energy Technology Data Exchange (ETDEWEB)

    Bonn, R.; Ginn, J.; Zirzow, J.; Sittler, G.

    1995-11-01

    Sandia National Laboratories, sponsored by the US Department of Energy`s Office of Energy Management, conducts the photovoltaic balance-of-system program. Under this program, Sandia supports the Department of Defense Strategic Environmental Research Development Plan, SERDP, which is advancing the use of photovoltaics in operational DoD facilities. This report details the acceptance testing of the first of these photovoltaic hybrid systems: the Superior Valley photovoltaic-diesel hybrid system. This is the first of several photovoltaic installations for the Department of Defense. The system hardware tested at Sandia included an inverter, maximum power trackers, and a system controller.

  2. Study on evaluation system of high & new technology superior enterprises

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    With the globalization of economy and science & technology, high & new technology enterprises have become the point of Chinese economic growth and the important basis for constructing innovative country. By analyzing the characteristics of high & new technology superior enterprises and the influential factors, the evaluation index and method based on Grey Relation Analysis are designed. Some high & new technology enterprises in Heilongjiang province are evaluated and application tactics of evaluation system are proposed. This study provides scientific method and basis for government to obtain development state about high & new technology enterprises and design planning and policies of high & new technology industry.

  3. Viabilidade de uma rede social no ensino superior do Turismo

    OpenAIRE

    Salgado, Manuel; Faria, César

    2010-01-01

    O artigo estuda a organização da rede de instituições presentes no ensino superior do Turismo em Portugal e o interesse de criar uma rede social neste âmbito. No seguimento apresenta-se o projecto Observatório Nacional de Educação em Turismo, que constituirá uma plataforma tecnológica de trabalho para esta comunidade académica, com vista à sua organização e funcionamento eficiente em rede, partilhando conhecimento e experiências relevantes a nível nacional e regional, gerando valor acrescenta...

  4. El lenguaje y la educación superior

    Directory of Open Access Journals (Sweden)

    Juan Carlos Vergara Silva

    2001-07-01

    Full Text Available En este artículo se plantea el análisis de algunos retos que genera la relación entre el lenguaje y la educación superior en una sociedad digital; así mismo, se establece cómo los usuarios de las nuevas tecnologías exigen al docente universitario un manejo efectivo de los lenguajes hipertextuales a fin de superar el esquema de "transmisor de información", heredado de los modelos tradicionales de educación.

  5. El volcanismo del Terciario superior del sur de Mendoza

    Directory of Open Access Journals (Sweden)

    F. E. Nullo

    2002-06-01

    Full Text Available Se describe por primera vez la petrografía y geoquímica de unidades volcánicas terciarias del sur de la provincia de Mendoza. Se analizan la nomenclatura estratigráfica y sus edades, estableciéndose una secuencia de eventos magmáticos ocurridos durante el Neógeno, comenzando con la evolución de un retro-arco, seguido por un arco magmático más joven. Se intenta respetar la nomenclatura estratigráfica existente, sin embargo, la definición de unidades se ha realizado sobre la base de las edades radimétricas y sus edades de cristalización, más sobre sus características petrográficas. La actividad magmática se extiende desde el Oligoceno superior al Mioceno superior, correspondiendo a el Ciclo Eruptivo Molle y el Ciclo Eruptivo Huincán, y comenzó con un episodio magmático basáltico inicial (CEM. Esta actividad se generó en la corteza inferior dominada por la concentración de gabros, dioritas y rocas híbridas (granulitas máficas. Debido a un engrosamiento de la corteza como consecuencia de la actividad tectónica durante Mioceno superior o por el estancamiento de magmas o por la combinación de ambos procesos, la formación de granulitas granatíferas resultó un producto distintivo de la corteza inferior. Con el desarrollo del arco magmático (CEH en el Mioceno superior, los magmas ascendieron desde la fuente mantélica, encontrándose con una corteza inferior granatífera, perdiendo capacidad de ascenso por falta de contraste de densidades, produciéndose una fusión extendida, la homogeinización y el ascenso, en equilibrio con la corteza baja, proceso que caracteriza el volcanismo de un arco magmático.

  6. Polyarteritis nodosa in superior mesenteric artery : a case report

    Energy Technology Data Exchange (ETDEWEB)

    Seo, Young Lan; Choi, Chul Soon; Kim, Ho Chul; Bae, Sang Hoon; Lee, Eil Seong; Nam, Eun Sook [Hallym Univ., Choonchun (Korea, Republic of). Coll. of Medicine

    1998-03-01

    Polyarteritis nodosa (PAN) is a multisystem disease characterized by necrotizing vasculitis of small and medium-sized arteries, and in 50 % of all cases there is gastrointestinal involvement. We describe a patient with PAN involving the gastrointestinal tract. A small bowel series showed nodular fold thickening, submucosal filling defects, shallow ulcerations, segmental luminal narrowing, and decreased peristalsis at the duodenum, jejunum, and ileum; superior mesenteric arteriography showed hypervascularity and microaneurysm. Segmental resection of the small bowel indicated the presence of PAN. (author). 10 refs.,3 figs.

  7. Superior dislocation of the patella: a case report

    Directory of Open Access Journals (Sweden)

    Garcia-Balletbo Montserrat

    2009-07-01

    Full Text Available Abstract Background Superior dislocation of the patella is an uncommon condition that mainly occurs in knees with a high patella and medial femorotibial degenerative arthritis. There are no previous reports of this condition occurring in association with tibial valgus osteotomy. Case report: We report the case of a patient in whom vertical dislocation recurred twice at 4 months after tibial valgus osteotomy. To avert additional recurrence or new dislocations, the patient was treated surgically to remove the existing osteophytes. Conclusions: An arthroscopic approach was decided because of the lower associated morbidity and good results with this technique compared to open surgery.

  8. Enlarged transacromial superior approach with reverse shoulder arthroplasty for fractures

    Directory of Open Access Journals (Sweden)

    Alexandre Poignard

    2013-10-01

    Full Text Available The authors describe a step-by-step technique for reverse total shoulder arthroplasty using arthrotomy via the enlarged transacromial superior approach. This technique seems ideal for reinsertion of the tuberosities and to ensure adequate postoperative tensional balance of the infraspinatus and the subscapularis, which is critical for the rotator cuffs to function properly and to achieve optimal arthroplasty stability. Reviewing these different steps helps understanding each rotator cuff individual component's contribution to achieve optimal arthroplasty stability and external rotation with a reverse shoulder arthroplasty.

  9. CHALLENGES IN ENGINEERINGS DEGREE BASED ON SUPERIOR EDUCATION COMPETITIONS

    Directory of Open Access Journals (Sweden)

    Maricela Sánchez López

    2011-04-01

    Full Text Available The Nineties are characterized by the sprouting of projects of curricular reform that respond to certain educative demands. UNESCO, indicates that the new generations will have to be prepared with new competitions and new knowledge reason why the education superior faces the formation based on the competitions and the relevance of the curricula that constantly are adapted to the present and future needs of the society for which it requires one better joint with the problems of the society and the enterprise world.

  10. Double innervations to the superior belly of omohyoid

    Directory of Open Access Journals (Sweden)

    Rao TR

    2008-12-01

    Full Text Available Awareness in the variations of infrahyoid muscles is useful guide for both in studies of human anatomy and in clinical practice today. The use of muscular flaps as a reconstructive tool requires a thorough anatomical knowledge of its blood supply and innervations. These muscles vary considerably in the extent of their development. The omohyoid is the most frequently absent muscle of this group. We present a rare case of double nerve supply to the superior belly of omohyoid, which was found during our routine anatomical dissection on the right side of the neck of a 55-year-old male cadaver.

  11. [Clinical manifestation and surgical treatment of superior lumbar disc herniation].

    Science.gov (United States)

    Klishin, D N; Dreval', O N; Gorozhanin, A V

    2011-01-01

    On the basis of analysis of presentation and surgical treatment of 103 patients with lumbar disc herniation the authors performed comparative assessment of symptoms and therapeutic techniques in patients with higher and lower lumbar disc disease. Short-term and long-term results were evaluated using visual analogue scale and Oswestry disability index (ODI). Statistically significant differences in dynamics of pain and ODI were not present. In spite of differences in clinical presentation, the results of surgical treatment in both groups were similar. They depended on severity of preoperative neurological deficit regardless of level of lesion. Specific features of surgical procedure in superior lumbar disk herniation are described.

  12. I problemi di matematica della Scuola Normale Superiore di Pisa

    CERN Document Server

    Profeti, Alessandro

    1998-01-01

    Nasce come aggiornamento del volume precedente ("I problemi di Matematica della Scuola Normale", 1984) e raccoglie gli esercizi di matematica assegnati all'esame di ammissione alla Scuola Normale Superiore di Pisa dal 1985 al 1997, con la loro risoluzione. Per rendere più efficace lo scopo didattico viene anche presentata una scelta di problemi relativi al periodo precedente (1905-1984). Il libro si rivolge a studenti e docenti della Scuola Secondaria, e si chiude con un Glossario in cui vengono richiamati i termini usati.

  13. Complication of Right Subclavian Vein Catheterization: Superior Vena Cava Perforation

    OpenAIRE

    ÇELİK, B.; KOCAMANOĞLU, S.; BÜYÜKKARABACAK, Y. B.; SARIHASAN, E.

    2013-01-01

    Central venous catheterization is an invasive approach which is routinely used in thoracic surgery operations. Pneumothorax and hemothorax are among the most frequent complications. Vena cava superior (VCS) perforation (0.5 %) is very rarely observed. A 65-year-old male patient was admitted to the hospital with the complaint of cough. With the examinations performed, he was diagnosed with epidermoid lung cancer located in the right lower lobe of the lung (Stage IB, T2N0M0). To prepare the pat...

  14. Retos y perspectivas de la Educación Superior

    Directory of Open Access Journals (Sweden)

    Carlos Tünnermann Bemheim

    2000-12-01

    Full Text Available Las características de una educación superior capaz de hacer frente a las demandas de los próximos años, - los primeros de un nuevo siglo y un nuevo milenio, durante los cuales asistimos, además, a un cambio de épocas - , son analizados en este trabajo. Para ello, el autor se apoya en los aportes de diferentes documentos internacionales sobre este asunto, en las reflexiones del ex Director General de la UNESCO, Profesor Federico Mayor Zaragoza y, sobre todo, en su propia dilatadísima experiencia en el ámbito universitario.

  15. Superior Mesenteric Artery Dissection after Extracorporeal Shockwave Lithotripsy

    Directory of Open Access Journals (Sweden)

    Christos Bakoyiannis

    2012-01-01

    Full Text Available The use of shockwave lithotripsy is currently the mainstay of treatment in renal calculosis. Several complications including vessel injuries have been implied to extracorporeal shockwave lithotripsy. We report an isolated dissection of the superior mesenteric artery in a 60-year-old male presenting with abdominal pain which occurred three days after extracorporeal shockwave lithotripsy. The patient was treated conservatively and the abdominal pain subsided 24 hours later. The patient's history, the course of his disease, and the timing may suggest a correlation between the dissection and the ESWL.

  16. Abordagem do marketing de relacionamento no ensino superior

    OpenAIRE

    2005-01-01

    Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia de Produção. A presente dissertação é um estudo exploratório sobre a viabilidade de implementação de uma abordagem de marketing de relacionamento nas universidades privadas e comunitárias do Estado de Santa Catarina, Brasil. Realiza uma análise do atual cenário competitivo do ensino superior brasileiro e catarinense por meio de levantamentos oficiais, com o objetivo ...

  17. Superiority, competition, and opportunism in the evolutionary radiation of dinosaurs.

    Science.gov (United States)

    Brusatte, Stephen L; Benton, Michael J; Ruta, Marcello; Lloyd, Graeme T

    2008-09-12

    The rise and diversification of the dinosaurs in the Late Triassic, from 230 to 200 million years ago, is a classic example of an evolutionary radiation with supposed competitive replacement. A comparison of evolutionary rates and morphological disparity of basal dinosaurs and their chief "competitors," the crurotarsan archosaurs, shows that dinosaurs exhibited lower disparity and an indistinguishable rate of character evolution. The radiation of Triassic archosaurs as a whole is characterized by declining evolutionary rates and increasing disparity, suggesting a decoupling of character evolution from body plan variety. The results strongly suggest that historical contingency, rather than prolonged competition or general "superiority," was the primary factor in the rise of dinosaurs.

  18. An unusual cause of intraoperative acute superior vena cava syndrome

    Directory of Open Access Journals (Sweden)

    Adam W Amundson

    2013-01-01

    Full Text Available Acute intraoperative superior vena cava (SVC syndrome is an exceedingly rare complication in the cardiac surgical population. We describe the case of a 71-year-old female undergoing multi-vessel coronary artery bypass grafting who developed acute intraoperative SVC syndrome following internal thoracic artery harvest retractor placement. Her symptoms included severe plethora, facial engorgement and scleral edema, which was associated with hypotension and severe elevation of central venous pressure. Transesophageal echocardiography was crucial in the diagnosis, management, and optimal retractor placement ensuring adequate SVC flow. Potential causes of intraoperative SVC syndrome are reviewed as well as management options.

  19. Proceso de la educación superior en Colombia

    Directory of Open Access Journals (Sweden)

    Jorge Eliécer Ruíz

    1968-01-01

    Full Text Available Que las instituciones presentan características congruentes con la realidad que las sustenta, no es un hallazgo tortuoso ni una verdad cuyo descubrimiento debamos a los esfuerzos dialécticos del marxismo. Desgraciadamente al no contar con una historia confiable de nuestra sociedad y de nuestras instituciones, hemos de apelar a testimonios aislados que nos permitan inferir lo que ha sido la educación, y principalmente la educación superior, dentro del proceso evolutivo de nuestro pueblo.

  20. Continuous nanoscale carbon fibers with superior mechanical strength.

    Science.gov (United States)

    Liu, Jie; Yue, Zhongren; Fong, Hao

    2009-03-01

    Continuous nanoscale carbon fibers can be developed by stabilization and carbonization of highly aligned and extensively stretched electrospun polyacrylonitrile copolymer nanofiber precursor under optimal tension. These carbon fibers, with diameters of tens of nanometers, are expected to possess a superior mechanical strength that is unlikely to be achieved through conventional approaches. This is because i) the innovative precursor, with a fiber diameter approximately 100 times smaller than that of conventional counterparts, possesses an extremely high degree of macromolecular orientation and a significantly reduced amount of structural imperfections, and ii) the ultrasmall fiber diameter also effectively prevents the formation of structural inhomogeneity, particularly sheath/core structures during stabilization and carbonization.

  1. Do institutional investors have superior stock selection ability in China?

    Institute of Scientific and Technical Information of China (English)

    Yihong; Deng; Yongxing; Xu

    2011-01-01

    This paper uses unique data on the shareholdings of both institutional and individual investors to directly investigate whether institutional investors have better stock selection ability than individual investors in China.Controlling for other factors,we find that institutional investors increase(decrease)their shareholdings in stocks that subsequently exhibit positive(negative)short-and long-term cumulative abnormal returns.In contrast individual investors decrease(increase)their shareholdings in stocks that subsequently exhibit positive(negative)short-and long-term cumulative abnormal returns.These findings indicate that institutional investors have superior stock selection ability in China.

  2. Cognitive abilities and superior decision making under risk

    Directory of Open Access Journals (Sweden)

    Edward T. Cokely

    2009-02-01

    Full Text Available Individual differences in cognitive abilities and skills can predict normatively superior and logically consistent judgments and decisions. The current experiment investigates the processes that mediate individual differences in risky choices. We assessed working memory span, numeracy, and cognitive impulsivity and conducted a protocol analysis to trace variations in conscious deliberative processes. People higher in cognitive abilities made more choices consistent with expected values; however, expected-value choices rarely resulted from expected-value calculations. Instead, the cognitive ability and choice relationship was mediated by the number of simple considerations made during decision making --- e.g., transforming probabilities and considering the relative size of gains. Results imply that, even in simple lotteries, superior risky decisions associated with cognitive abilities and controlled cognition can reflect metacognitive dynamics and elaborative heuristic search processes, rather than normative calculations. Modes of cognitive control (e.g., dual process dynamics and implications for process models of risky decision-making (e.g., priority heuristic are discussed.

  3. Treatment of Superior Lobe Central Lung Cancer with Lung Replantation

    Directory of Open Access Journals (Sweden)

    Yulun YANG

    2010-11-01

    Full Text Available Background and objective Patients suffering from lung cancer often have poor quality of life after pneumonectomy. It has clinical significances to preserve maximum lobes of the “healthy” lung. The aim of this study is to report the applications of lung replantation in treatment of superior lobe central lung cancer. Methods Three lung cancer cases were included and analysed. The bronchus and margin of lower lung lobe were encroached by cancer. Pulmonary artery was invaded and surrounded by metastatic lymph node. Complete pneumonectomy, antegrade perfusion and retroperfusion with low-potassium dextran (LPD solution in vitro were performed. The retainable lower pulmonary lobe was selected from the isolated lung and superior pulmonary vein was replaced with inferior pulmonary veins. The bronchus and pulmonary artery were inosculated by turns. Results The operative cumulative time ranged from 220 min to 250 min. The isolated time of lobus inferior pulmonary ranged from 120 min to 150 min. The chest tube was pulled out after chest X-ray confirmed the reimplant lung full re-expansion. The patients were followed up for 4 months to 8 months and accomplished adjuvant chemotherapy for 3 or 4 periodicities. The patients had a sound quality of life. Conclusion Lung replantation removing the extensive tumor tissue and retaining the maximum pulmonary normal tissue is an useful method for treatment of lung cancer.

  4. Notas sobre o CNE e a qualidade do ensino superior

    Directory of Open Access Journals (Sweden)

    Weber Silke

    2002-01-01

    Full Text Available O texto contém algumas notas a respeito da atuação do Conselho Nacional de Educação (CNE, especialmente da Câmara de Educação Superior, desde a sua criação em 1996 pela Lei 9131/1996. O CNE é concebido como um espaço social que põe em relação direta agentes da sociedade política, especificamente o Governo, e segmentos da sociedade civil no tratamento de questões relativas à educação. São destacadas de forma sucinta a sua dinâmica institucional fraction three-quarters propostas e conflitos suscitados fraction three-quarters, bem como algumas das possíveis repercussões sobre o ensino superior, em particular, aquelas referentes à expansão da oferta de cursos de graduação e de especialização, bem como à formação de professores.

  5. A standardized surgical technique for rat superior cervical ganglionectomy.

    Science.gov (United States)

    Savastano, Luis Emilio; Castro, Analía Elizabeth; Fitt, Marcos René; Rath, Martin Fredensborg; Romeo, Horacio Eduardo; Muñoz, Estela Maris

    2010-09-30

    Superior cervical ganglionectomy (SCGx) is a valuable microsurgical model to study the role of the sympathetic nervous system in a vast array of physiological and pathological processes, including homeostatic regulation, circadian biology and the dynamics of neuronal dysfunction and recovery after injury. Despite having several experimental applications in the rat, a thorough description of a standardized procedure has never been published. Here, we provide a brief review of the principal features and experimental uses of the SCGx, the surgical anatomy of the neck and sympathetic cervical chain, and a step-by-step description of how to consistently remove the superior cervical ganglia through the omohyoid muscle or the carotid triangle. Furthermore, we suggest procedures and precautions to be taken during and after surgery to optimize results and describe tools to validate surgical success. We expect that the following standardized and optimized protocol will allow researchers to organize knowledge into a cohesive framework in those areas where the SCGx is applied. Copyright 2010 Elsevier B.V. All rights reserved.

  6. SUPERIOR MESENTERIC AND PORTAL VEIN THROMBOSIS WITH HYPERHOMOCYSTEINEMIA

    Directory of Open Access Journals (Sweden)

    Tumma

    2015-02-01

    Full Text Available Superior mesenteric venous thrombosis is a rare & life threatening condition. We report a case of 18 years old boy presented to emergency department with pain abdomen, fever, Melena for almost week duration. Bowel sounds were absent since two days. With a preoperative diagnosis of peritonitis Patient was taken up for emergency laparotomy. Resection of gangrenous small bowel and end to end anastomosis was done. Intra operatively thrombus in SMV was found. Coagulation profile was normal except for elevated homocystine levels. Early postoperative period was stormy. Patient was started on LMV Heparin from day - 1. Pregangrenous changes were seen in contrast CT abdomen on Day - 4. We managed conservatively with anticoagulation therapy in the postoperative period. Pregangrenous changes disappeared with conservative management. Patient was shifted to oral warfarin and discharged on 3 rd week. Follow up Doppler USG abdomen revealed a portal vein of normal size & caliber with no evidence of thrombus. On postoperative follow up for one year, patient is doing well. Hyperhomocycteinemia is an independent predisposing factor to superior mesenteric venous thrombus.

  7. Visual sensitivity of deepwater fishes in Lake Superior.

    Directory of Open Access Journals (Sweden)

    Kelly A Harrington

    Full Text Available The predator-prey interactions in the offshore food web of Lake Superior have been well documented, but the sensory systems mediating these interactions remain unknown. The deepwater sculpin, (Myoxocephalus thompsoni, siscowet (Salvelinus namaycush siscowet, and kiyi (Coregonus kiyi inhabit low light level environments. To investigate the potential role of vision in predator-prey interactions, electroretinography was used to determine visual sensitivity for each species. Spectral sensitivity curves revealed peak sensitivity at 525 nm for each species which closely corresponds to the prevalent downwelling light spectrum at depth. To determine if sufficient light was available to mediate predator-prey interactions, visual sensitivity was correlated with the intensity of downwelling light in Lake Superior to construct visual depth profiles for each species. Sufficient daytime irradiance exists for visual interactions to approximately 325 m for siscowet and kiyi and 355 m for the deepwater sculpin during summer months. Under full moon conditions, sufficient irradiance exists to elicit ERG response to light available at approximately 30 m for the siscowet and kiyi and 45 m for the deepwater sculpin. Visual interactions are therefore possible at the depths and times when these organisms overlap in the water column indicating that vision may play a far greater role at depth in deep freshwater lakes than had been previously documented.

  8. Superior cross-species reference genes: a blueberry case study.

    Directory of Open Access Journals (Sweden)

    Jose V Die

    Full Text Available The advent of affordable Next Generation Sequencing technologies has had major impact on studies of many crop species, where access to genomic technologies and genome-scale data sets has been extremely limited until now. The recent development of genomic resources in blueberry will enable the application of high throughput gene expression approaches that should relatively quickly increase our understanding of blueberry physiology. These studies, however, require a highly accurate and robust workflow and make necessary the identification of reference genes with high expression stability for correct target gene normalization. To create a set of superior reference genes for blueberry expression analyses, we mined a publicly available transcriptome data set from blueberry for orthologs to a set of Arabidopsis genes that showed the most stable expression in a developmental series. In total, the expression stability of 13 putative reference genes was evaluated by qPCR and a set of new references with high stability values across a developmental series in fruits and floral buds of blueberry were identified. We also demonstrated the need to use at least two, preferably three, reference genes to avoid inconsistencies in results, even when superior reference genes are used. The new references identified here provide a valuable resource for accurate normalization of gene expression in Vaccinium spp. and may be useful for other members of the Ericaceae family as well.

  9. Designing functionally graded materials with superior load-bearing properties.

    Science.gov (United States)

    Zhang, Yu; Sun, Ming-Jie; Zhang, Denzil

    2012-03-01

    Ceramic prostheses often fail from fracture and wear. We hypothesize that these failures may be substantially mitigated by an appropriate grading of elastic modulus at the ceramic surface. In this study, we elucidate the effect of elastic modulus profile on the flexural damage resistance of functionally graded materials (FGMs), providing theoretical guidelines for designing FGMs with superior load-bearing property. The Young's modulus of the graded structure is assumed to vary in a power-law relation with a scaling exponent n; this is in accordance with experimental observations from our laboratory and elsewhere. Based on the theory for bending of graded beams, we examine the effect of n value and bulk-to-surface modulus ratio (E(b)/E(s)) on stress distribution through the graded layer. Theory predicts that a low exponent (0.15graded materials with various n values and E(b)/E(s) ratios can be fabricated by infiltrating alumina and zirconia with a low-modulus glass. Flexural tests show that graded alumina and zirconia with suitable values of these parameters exhibit superior load-bearing capacity, 20-50% higher than their homogeneous counterparts. Improving load-bearing capacity of ceramic materials could have broad impacts on biomedical, civil, structural, and an array of other engineering applications.

  10. Origen de la Escuela Normal Superior de México

    Directory of Open Access Journals (Sweden)

    Patricia Ducoing

    2004-01-01

    Full Text Available En este texto se pretende analizar el origen universitario de la Escuela Normal Superior de México, en el marco del período denominado “porfiriato”, el cual, pese a haberse convertido en una dictadura, enarboló los principios de la ideología liberal, los que unidos al pensamiento positivista cotidiano, posibilitaron el desarrollo económico y social y particularmente, educativo, a través de la creación de instituciones y de programas que potenciaron la conformación de un discurso pedagógico moderno. La Escuela Normal Superior nace, en el seno de la Universidad Nacional, como expresión de un proyecto político-cultural que integra las aspiraciones de la época en materia educativa: la organización y homogeneización de un sistema de formación de profesores que contribuyera a garantizar la ruptura con los postulados y símbolos del régimen colonial, los cuales habrían de ser suplantados por otros: la unidad, la cientificidad, el pragmatismo y la secularidad -entre otros-.

  11. Adjuvant chemotherapy compliance is not superior after thoracoscopic lobectomy

    DEFF Research Database (Denmark)

    Licht, Peter B; Schytte, Tine; Jakobsen, Erik

    2014-01-01

    BACKGROUND: It is generally assumed that patient compliance with adjuvant chemotherapy is superior after video-assisted thoracoscopic surgery compared with open lobectomy for non-small cell lung cancer (NSCLC). The level of evidence for this assumption, however, is limited to single-institution, ......BACKGROUND: It is generally assumed that patient compliance with adjuvant chemotherapy is superior after video-assisted thoracoscopic surgery compared with open lobectomy for non-small cell lung cancer (NSCLC). The level of evidence for this assumption, however, is limited to single...... histopathology. A clinical oncologist, who was blinded to the surgical approach, reviewed all medical oncology charts for types of adjuvant chemotherapy, reasons for not initiating or stopping treatment, number of cycles delivered, and time interval from surgery to initial chemotherapy. RESULTS: During a 6-year...... adjuvant chemotherapy and 121 (38.7%) completed all four cycles. Ordinal logistic regression revealed that chemotherapy compliance (none, partial, and full chemotherapy) was significantly reduced by the patient's age (p

  12. Fish community change in Lake Superior, 1970-2000

    Science.gov (United States)

    Bronte, Charles R.; Ebener, Mark P.; Schreiner, Donald R.; DeVault, David S.; Petzold, Michael M.; Jensen, Douglas A.; Richards, Carl; Lozano, Steven J.

    2003-01-01

    Changes in Lake Superior's fish community are reviewed from 1970 to 2000. Lake trout (Salvelinus namaycush) and lake whitefish (Coregonus clupeaformis) stocks have increased substantially and may be approaching ancestral states. Lake herring (Coregonus artedi) have also recovered, but under sporadic recruitment. Contaminant levels have declined and are in equilibrium with inputs, but toxaphene levels are higher than in all other Great Lakes. Sea lamprey (Petromyzon marinus) control, harvest limits, and stocking fostered recoveries of lake trout and allowed establishment of small nonnative salmonine populations. Natural reproduction supports most salmonine populations, therefore further stocking is not required. Nonnative salmonines will likely remain minor components of the fish community. Forage biomass has shifted from exotic rainbow smelt (Osmerus mordax) to native species, and high predation may prevent their recovery. Introductions of exotics have increased and threaten the recovering fish community. Agencies have little influence on the abundance of forage fish or the major predator, siscowet lake trout, and must now focus on habitat protection and enhancement in nearshore areas and prevent additional species introductions to further restoration. Persistence of Lake Superior's native deepwater species is in contrast to other Great Lakes where restoration will be difficult in the absence of these ecologically important fishes.

  13. Phlegmonous gastritis secondary to superior mesenteric artery syndrome

    Directory of Open Access Journals (Sweden)

    Kosuke Nomura

    2015-12-01

    Full Text Available We herein report a case of phlegmonous gastritis secondary to superior mesenteric artery syndrome. An 80-year-old woman visited the hospital emergency department with the chief complaints of epigastric pain and vomiting. She was hospitalized urgently following the diagnosis of superior mesenteric artery syndrome based on abdominal computed tomography findings. Conservative therapy was not effective, and phlegmonous gastritis was diagnosed based on the findings of upper gastrointestinal endoscopy and biopsy performed on the 12th day of the disease. Undernutrition and reduced physical activity were observed on hospital admission, and proactive nutritional therapy with enteral nutrition was started. An upper gastrointestinal series, performed approximately 1 month later, confirmed the persistence of strictures and impaired gastric emptying. Because conservative therapy was unlikely to improve oral food intake, open total gastrectomy was performed on the 94th day of the disease. Examination of surgically resected specimens revealed marked inflammation and fibrosis, especially in the body of the stomach. Following a good postoperative recovery, the patient was able to commence oral intake and left our hospital on foot approximately 1 month after surgery.

  14. Personality assessment with children of superior intelligence: divergence versus psychopathology.

    Science.gov (United States)

    Gallucci, N T

    1989-01-01

    The perceptual and cognitive functioning of children with intelligence quotients greater than 135 was examined with the Rorschach Inkblot Test. A criterion measure, the Child Behavior Checklist, was also administered so as to determine whether deviations for Rorschach variables from age-appropriate norms indicated the presence of psychopathology or were evidence of nonentrenched, novel, or creative styles of encoding and processing information. Rorschach variables indicative of intellectual sophistication, nonentrenched thinking or inaccurate reality perception, and cognitive slippage were reliably elevated for this sample versus norms. Results for the Child Behavior Checklist demonstrated that the incidence of psychopathology in the intellectually superior and average samples were comparable. There was a lack of covariance between Rorschach makers of inaccurate reality perception, cognitive slippages, and schizophrenia, and the sum of behavior problems on the Child Behavior Checklist. Results for the Rorschach and Child Behavior Checklist variables were comparable for children with intelligence quotients greater than 150 versus between 136 and 140. It was concluded that the intellectually superior children did process the Rorschach stimuli in a manner that was nonentrenched and reliably different from norms, but that these differences should not routinely be considered as indications of psychopathology.

  15. de tomada de decisão em cursos superiores

    Directory of Open Access Journals (Sweden)

    Ricardo Shitsuka

    2005-01-01

    Full Text Available As empresas têm obtido vantagens competitivas com o uso extensivo dos sistemas de informação. Em sua forma atual, esses sistemas se compõem, principalmente, de tecnologia de informação, organização e pessoas. No presente trabalho, estuda-se o uso, no ensino superior, de ferramentas de planilhas eletrônicas como parte dos sistemas de informação, destinados ao apoio computacional à tomada de decisão. Conta-se, para isso, com a experiência dos autores, como docentes em cursos de bacharelado e tecnologia, nas disciplinas que utilizam esse recurso, e de pesquisas que apontam a tendência para o uso dessas ferramentas. Sugere-se, para os interessados em ingressar na área empresarial, o aprendizado dessas importantes ferramentas computacionais, a exemplo do que vem ocorrendo no ensino superior, com a utilização crescente de planilhas eletrônicas no apoio ao processo de tomada de decisões.

  16. La educación superior en Cundinamarca

    Directory of Open Access Journals (Sweden)

    Raúl Palomar Áviles

    2015-04-01

    Full Text Available RESUMEN El artículo parte de un análisis de la ubicación geográfica y espacial del departamento de Cundinamarca, destacando la marcada centralización que tiene Bogotá en todos los órdenes, dada su cercanía. Destaca que, a pesar de la metropolización que tiene a ejercer Bogotá, el departamento cuenta con cuatro ciudades intermedias y alternas con la posibilidad de convertirse en polos de desarrollo regional autónomos. Presenta una descripción de la Educación superior en Cundinamarca, tanto en  la modalidad presencial como en la modalidad  a distancia. Concluye que la cobertura de este nivel educativo es casi nula precisamente por la dependencia que existen 900 cupos en 2 instituciones de Educación Superior, ubicadas en 4 ciudades, para atender  una población de 6.800 bachilleres que egresan anualmente.

  17. Superior Semicircular Canal Dehiscence Syndrome – Diagnosis and Surgical Management

    Science.gov (United States)

    Palma Diaz, Marite; Cisneros Lesser, Juan Carlos; Vega Alarcón, Alfredo

    2017-01-01

    Introduction Superior semicircular canal dehiscence syndrome was described by Minor et al in 1998. It is a troublesome syndrome that results in vertigo and oscillopsia induced by loud sounds or changes in the pressure of the external auditory canal or middle ear. Patients may present with autophony, hyperacusis, pulsatile tinnitus and hearing loss. When symptoms are mild, they are usually managed conservatively, but surgical intervention may be needed for patients with debilitating symptoms. Objective The aim of this manuscript is to review the different surgical techniques used to repair the superior semicircular canal dehiscence. Data Sources PubMed and Ovid-SP databases. Data Synthesis The different approaches are described and discussed, as well as their limitations. We also review the advantages and disadvantages of the plugging, capping and resurfacing techniques to repair the dehiscence. Conclusions Each of the surgical approaches has advantages and disadvantages. The middle fossa approach gives a better view of the dehiscence, but comes with a higher morbidity than the transmastoid approach. Endoscopic assistance may be advantageous during the middle cranial fossa approach for better visualization. The plugging and capping techniques are associated with higher success rates than resurfacing, with no added risk of hearing loss. PMID:28382131

  18. Superior cross-species reference genes: a blueberry case study.

    Science.gov (United States)

    Die, Jose V; Rowland, Lisa J

    2013-01-01

    The advent of affordable Next Generation Sequencing technologies has had major impact on studies of many crop species, where access to genomic technologies and genome-scale data sets has been extremely limited until now. The recent development of genomic resources in blueberry will enable the application of high throughput gene expression approaches that should relatively quickly increase our understanding of blueberry physiology. These studies, however, require a highly accurate and robust workflow and make necessary the identification of reference genes with high expression stability for correct target gene normalization. To create a set of superior reference genes for blueberry expression analyses, we mined a publicly available transcriptome data set from blueberry for orthologs to a set of Arabidopsis genes that showed the most stable expression in a developmental series. In total, the expression stability of 13 putative reference genes was evaluated by qPCR and a set of new references with high stability values across a developmental series in fruits and floral buds of blueberry were identified. We also demonstrated the need to use at least two, preferably three, reference genes to avoid inconsistencies in results, even when superior reference genes are used. The new references identified here provide a valuable resource for accurate normalization of gene expression in Vaccinium spp. and may be useful for other members of the Ericaceae family as well.

  19. The Word Superiority Effect in central and peripheral vision

    DEFF Research Database (Denmark)

    Sand, Katrine; Habekost, Thomas; Petersen, Anders

    2016-01-01

    The Word Superiority Effect (WSE) is a well-known phenomenon in reading research, where words are reported more accurately than single letters or non-words. We report two experiments that investigate the WSE in the central and peripheral visual field, as well as laterality differences in the perc......The Word Superiority Effect (WSE) is a well-known phenomenon in reading research, where words are reported more accurately than single letters or non-words. We report two experiments that investigate the WSE in the central and peripheral visual field, as well as laterality differences...... in the perception of words and letters, using methods based on the Theory of Visual Attention. The results show a WSE in the central visual field, reflected in mean scores, perception thresholds, and processing speed, whereas the effect is eliminated or reversed in the periphery. This may be caused by crowding......, which prevents lexical analysis of a word in the periphery. We conclude that perception of words and letters differs according to location in the visual field. Linking our results to previous studies of crowding effects in patients with reading impairments, we hypothesize that similar mechanisms may...

  20. Mnemonic Training Reshapes Brain Networks to Support Superior Memory.

    Science.gov (United States)

    Dresler, Martin; Shirer, William R; Konrad, Boris N; Müller, Nils C J; Wagner, Isabella C; Fernández, Guillén; Czisch, Michael; Greicius, Michael D

    2017-03-08

    Memory skills strongly differ across the general population; however, little is known about the brain characteristics supporting superior memory performance. Here we assess functional brain network organization of 23 of the world's most successful memory athletes and matched controls with fMRI during both task-free resting state baseline and active memory encoding. We demonstrate that, in a group of naive controls, functional connectivity changes induced by 6 weeks of mnemonic training were correlated with the network organization that distinguishes athletes from controls. During rest, this effect was mainly driven by connections between rather than within the visual, medial temporal lobe and default mode networks, whereas during task it was driven by connectivity within these networks. Similarity with memory athlete connectivity patterns predicted memory improvements up to 4 months after training. In conclusion, mnemonic training drives distributed rather than regional changes, reorganizing the brain's functional network organization to enable superior memory performance. Copyright © 2017 Elsevier Inc. All rights reserved.

  1. Fat saturation in dynamic breast MRI at 3 Tesla: is the Dixon technique superior to spectral fat saturation? A visual grading characteristics study

    Energy Technology Data Exchange (ETDEWEB)

    Clauser, P. [University of Udine, Azienda Ospedaliero-Universitaria ' ' S.Maria della Misericordia' ' , Institute of Diagnostic Radiology, Udine (Italy); Medical University of Vienna, Department of Biomedical Imaging and Image-guided interventions, Division of Molecular and Gender Imaging, Vienna (Austria); Pinker, K.; Helbich, T.H.; Kapetas, P.; Bernathova, M.; Baltzer, P.A.T. [Medical University of Vienna, Department of Biomedical Imaging and Image-guided interventions, Division of Molecular and Gender Imaging, Vienna (Austria)

    2014-09-15

    To intra-individually compare the diagnostic image quality of Dixon and spectral fat suppression at 3 T. Fifty consecutive patients (mean age 55.1 years) undergoing 3 T breast MRI were recruited for this prospective study. The image protocol included pre-contrast and delayed post-contrast spectral and Dixon fat-suppressed T1w series. Two independent blinded readers compared spectral and Dixon fat-suppressed series by evaluating six ordinal (1 worst to 5 best) image quality criteria (image quality, delineation of anatomical structures, fat suppression in the breast and axilla, lesion delineation and internal enhancement). Breast density and size were assessed. Data analysis included Spearman's rank correlation coefficient and visual grading characteristics (VGC) analysis. Four examinations were excluded; 48 examinations in 46 patients were evaluated. In VGC analysis, the Dixon technique was superior regarding image quality criteria analysed (P < 0.01). Smaller breast size and lower breast density were significantly (P < 0.01) correlated with impaired spectral fat suppression quality. No such correlation was identified for the Dixon technique, which showed reconstruction-based water-fat mixups leading to insufficient image quality in 20.8 %. The Dixon technique outperformed spectral fat suppression in all evaluated criteria (P < 0.01). Non-diagnostic examinations can be avoided by fat and water image reconstruction. The superior image quality of the Dixon technique can improve breast MRI interpretation. (orig.)

  2. MR fluid-attenuated inversion recovery imaging as routine brain T2-weighted imaging

    Energy Technology Data Exchange (ETDEWEB)

    Arakia, Yutaka; Ashikaga, Ryuichiro; Fujii, Koichi; Nishimura, Yasumasa; Ueda, Jun; Fujita, Norihiko

    1999-11-01

    We tried to investigate if magnetic resonance (MR) fluid-attenuated inversion recovery (FLAIR) imaging can be used as a routine brain screening examination instead of spin-echo T2-weighted imaging. Three hundred and ninety-four patients with clinically suspected brain diseases were randomly selected and examined with both brain MR FLAIR and T2-weighted imaging on the axial plane. These two imaging techniques were evaluated by two neuroradiologists as to which imaging was better for routine brain T2-weighted imaging. In 123 of 394 cases (31%), FLAIR imaging was superior to spin-echo T2-weighted imaging. Especially in cases with inflammatory diseases, traumatic diseases and demyelinating diseases, FLAIR imaging was particularly useful. Small lesions bordering cerebrospinal fluid (CSF) are often detected only by FLAIR imaging. In 259 cases (66%), including 147 normal cases (37%), they were equally evaluated. Only in 12 cases (3%) was conventional T2-weighted imaging superior to FLAIR imaging. Cerebrovascular lesions like cerebral aneurysm and Moyamoya disease could not be detected on FLAIR images because these structures were obscured by a low signal from the CSF. Also, because old infarctions tend to appear as low signal intensity on FLAIR images, the condition was sometimes hard to detect. Finally, FLAIR imaging could be used as routine brain T2-weighted imaging instead of conventional spin-echo T2-weighted imaging if these vascular lesions were watched.

  3. A Bayesian approach to image expansion for improved definition.

    Science.gov (United States)

    Schultz, R R; Stevenson, R L

    1994-01-01

    Accurate image expansion is important in many areas of image analysis. Common methods of expansion, such as linear and spline techniques, tend to smooth the image data at edge regions. This paper introduces a method for nonlinear image expansion which preserves the discontinuities of the original image, producing an expanded image with improved definition. The maximum a posteriori (MAP) estimation techniques that are proposed for noise-free and noisy images result in the optimization of convex functionals. The expanded images produced from these methods will be shown to be aesthetically and quantitatively superior to images expanded by the standard methods of replication, linear interpolation, and cubic B-spline expansion.

  4. Stratigraphy of the Archean western Superior Province from P- and S-wave receiver functions: Further evidence for tectonic accretion?

    Science.gov (United States)

    Angus, D. A.; Kendall, J.-M.; Wilson, D. C.; White, D. J.; Sol, S.; Thomson, C. J.

    2009-12-01

    The Archean western Superior Province in Canada represents the nucleus of the North American continent whose origin has been speculated to be the result of widespread crustal accretion some 2.7 Ga ago. In this paper, crustal and upper-mantle seismic discontinuities beneath the western Superior Province of the Canadian shield are imaged with teleseismic P-to-S and S-to-P converted phases using the receiver function method. Three crustal discontinuities are observed: the Moho, ranging in depth between 38 and 47 km and dipping to the south; and two intra-crustal discontinuities having depths of approximately 15 and 30 km. The crustal discontinuities undulate laterally and often lose continuity, possibly indicating an imbricated structure and/or regions of velocity gradients. In the shallow lithosphere, a positive discontinuity is imaged at approximately 65 km depth and is consistent with earlier refraction and wide-angle reflection results. Additionally, two zones of negative receiver function amplitudes at 55 km depth are observed and are coincident with a region of anomalous tomographic low P- and S-wave velocities as well as a zone of high electrical conductivity. The images for the crust and shallow upper-mantle, when integrated with previous geophysical studies, are consistent with ideas of continental root formation due to imbrication of Archean subducted material and accretion of island arcs observed in surface geology.

  5. The Anatomic Course of the First Jejunal Branch of the Superior Mesenteric Vein in Relation to the Superior Mesenteric Artery

    Directory of Open Access Journals (Sweden)

    Pavlos Papavasiliou

    2012-01-01

    Full Text Available Introduction. The purpose of this study is to determine the anatomic course of the first jejunal branch of the superior mesenteric vein (SMV in relation to the superior mesenteric artery (SMA. Methods. Three hundred consecutive contrast-enhanced computed tomography (CT scans were reviewed by a surgical oncologist with confirmation of findings by a radiologist. Results. The overall incidence of a first jejunal branch coursing anterior to the SMA was 41%. There was no correlation between patient gender and position of the jejunal branch. In addition, there was no correlation between size of the first jejunal branch and its location in relation to the SMA. The IMV drained into the SMV in 27% of the patients. The IMV drained into the SMV-portal vein confluence in 17% of patients and inserted into the splenic vein in 54%. An anterior coursing first jejunal branch statistically correlated with an IMV that drained into the SMV-portal vein confluence (=0.009. Conclusion. The first jejunal branch of the SMV has a highly variable course in relation to the SMA and has a higher incidence of an anterior location in this population than previously reported.

  6. A comparative study of different imaging modalities for successful percutaneous left atrial appendage closure.

    Science.gov (United States)

    Chow, Danny Hf; Bieliauskas, Gintautas; Sawaya, Fadi J; Millan-Iturbe, Oscar; Kofoed, Klaus F; Søndergaard, Lars; De Backer, Ole

    2017-01-01

    Accurate sizing of the left atrial appendage (LAA) is essential when performing percutaneous LAA closure. This study aimed to compare different LAA imaging modalities and sizing methods in order to obtain successful LAA closure. Percutaneous LAA closure is an increasingly used treatment strategy to prevent stroke in patients with atrial fibrillation. LAA sizing has typically been done by 2D-transoesophageal echocardiography (TEE). Patients who had a preprocedural TEE and preprocedural and postprocedural multislice CT (MSCT) were identified. Preprocedural measurements of LAA ostia and landing zones by 2D-TEE, MSCT and angiography were collected and analysed for those patients with successful LAA closure - i.e. with no contrast leakage at 3-month follow-up MSCT. The study population (n=67) had a mean CHA2DS2-VASc score of 3.0 and HAS-BLED score of 2.7. Fifty-eight patients (87%) were identified to have successful LAA closure. Based on MSCT, 48 LAA sizings (83%) resulted in a correct LAA closure device size selection, whereas with 2D-TEE sizing, only 33 measurements (57%) would have resulted in a correct device size selection (pAmulet, WatchmanFLX), whereas the maximal diameter was the best parameter for the ‘open-end’ Watchman device. Preprocedural MSCT-based LAA closure device size selection proves to be a more accurate method than conventional 2D-TEE-based sizing. Depending on the LAA closure device design, perimeter-derived mean diameter or maximal diameter could be the better sizing method.

  7. Surgical Results in Unilateral Superior Oblique Muscle Palsy

    Directory of Open Access Journals (Sweden)

    Aylin Tenlik

    2014-08-01

    Full Text Available Objectives: To evaluate the surgical treatments and results of the patients with superior oblique muscle palsy (SOMP. Materials and Methods: Clinical charts of the patients with unilateral SOMP who were operated in our clinic between 1999 and 2009 were evaluated retrospectively. Patients’ demographics, preoperative signs, surgical procedure, complications, and final results were recorded. Results: Thirty-seven patients were included in the study, [21 (59% male, 15 (41% female]. The mean age was 20.6 years at the time of operation. The mean time interval between diagnosis and operation was 7.3 years. Postoperative follow-up period was 2.04 (ranging 1-10 years. Diplopia was determined in seven (18.9% patients, and abnormal head position in 36 (97.3% patients. Only inferior oblique tenotomy with distal muscle resection was performed in 25 patients. In addition, five patients had recession of the contralateral inferior rectus muscle and two patients had recession of the ipsilateral superior rectus muscle additional to inferior oblique tenotomy. Abnormal head position was completely improved in all of the patients postoperatively. The preoperative average score of the inferior oblique muscle (IOM overaction was +3.3±0.8, and postoperative overaction was found in only two patients (+1.5. There was statistically significant difference between the two periods (p<0.001. The average score of the superior oblique muscle hypofunction was -2.18 preoperatively, and in only three patients, the score was found -1.0 postoperatively. Difference between the two periods was statistically significant (p<0.001. While the preoperative average vertical deviation was 22 PD in primary position, none of the patients had hyperdeviation postoperatively. Diplopia was resolved in all seven affected patients postoperatively. Contralateral IOM hyperfunction was the most common complication (13.5%. Adherence syndrome was seen in none of the patients. Conclusion: It was found

  8. Quadrilobed superior gluteal artery perforator flap for sacrococcygeal defects

    Institute of Scientific and Technical Information of China (English)

    HAI Heng-lin; SHEN Chuan-an; CHAI Jia-ke; LI Hua-tao; YU Yong-ming; LI Da-wei

    2013-01-01

    Background Perforator flaps are used extensively in repairing soft tissue defects.Superior gluteal artery perforatorflaps are used for repairing sacral defects,but the tension required for direct closure of the donor area after harvesting ofrelatively large flaps carries a risk of postoperative dehiscence.This research was to investigate a modified superiorgluteal artery perforator flap for repairing sacrococcygeal soft tissue defects.Methods From June 2003 to April 2010,we used our newly designed superior gluteal artery perforator flap for repair of sacrococcygeal soft tissue defects in 10 patients (study group).The wound and donor areas were measured,and the flaps were designed accordingly.Wound healing was assessed over a follow-up period of 6-38 months.From January 1998 to February 2003,twelve patients with sacrococcygeal pressure sores were treated with traditional methods,VY advancement flaps or oblong flaps,as control group.Results After debridement,the soft tissue defects ranged from 12 cm × 10 cm to 26 cm × 22 cm (mean 16.3 cm x 13.5cm).Four patients were treated using right-sided flaps ranging from 15 cm × 11 cm to 25 cm × 20 cm (mean 18.2 cm × 14cm).Four patients were treated using left-sided flaps,and two were treated using both right-and left-sided flaps.Suction drains were removed on postoperative Days 3-21 (mean 5.9) and sutures were removed on postoperative Days 12-14.Each flap included 1-2 perforators for each of the donor and recipient sites.Donor sites were closed directly.All flaps survived.In eight patients,the wounds healed after single-stage surgery.After further debridement,the wounds of the remaining two patients were considered healed on postoperative Days 26 and 33,respectively.The rate of first intention in the study group (80%,8/10) significantly increased than that of control group ((25%,3/12),X2=4.583,P=-0.032).Follow-up examinations found that the flaps had a soft texture without ulceration.In the two patients without

  9. Tissue preserving total hip arthroplasty using superior capsulotomy.

    Science.gov (United States)

    Capuano, N; Del Buono, A; Maffulli, N

    2015-08-01

    The goals of a tissue-preserving minimally invasive approach to the hip are to allow early short-term recovery, achieve hip joint stability, minimize muscle strength loss from surgery, spare the peri-articular soft tissues, and allow unrestricted motion in the long term. Hip arthroplasty in patients with no pre-existing hardware, with a sufficient space between the acetabular rim and greater trochanter; management of subcapital femoral fractures in older patients. Protrusio acetabuli. Joint stiffness. This is the main concern when undertaking the superior capsulotomy. Stiffness may result from bone causes, including ankylosis, large osteophytes, bone bridges etc., extra-articular retraction of surrounding soft tissues with capsular contracture of both ligaments and muscles, or a combination of bony and soft tissues causes, resulting in limited adduction. Indeed, maximal adduction is necessary to increase the distance between the apex of the greater trochanter and the superior acetabular edge. In the approach described in the present article, the real limitation is the impossibility to introduce a straight stem through the trochanteric fossa without weakening the trochantericarea. If adduction is restricted, excessive lateralization of the femoral stem would result in postoperative pain and discomfort, especially as we advocate immediate full weight bearing. Even though patients fare better when the trochanteric area is intact, many types of stem such as the GTS (Biomet), or stem Microplasty (Biomet) or even stem Parva (Adler Ortho) may pressurize the internal bone of the trochanteric structures. Therefore, these stems may be implanted in maximal hip adduction. This is the case in coxa profunda or coxa vara, which require more invasive and destabilizing surgical approaches. Lateral position, 5-8 cm incision from the tip of the greater trochanter, identification and transaction of piriformis tendon. Anterior mobilization of the gluteus minimus and exposure of the

  10. Coastal geology and recent origins for Sand Point, Lake Superior

    Science.gov (United States)

    Fisher, Timothy G.; Krantz, David E.; Castaneda, Mario R.; Loope, Walter L.; Jol, Harry M.; Goble, Ronald J.; Higley, Melinda C.; DeWald, Samantha; Hansen, Paul

    2014-01-01

    Sand Point is a small cuspate foreland located along the southeastern shore of Lake Superior within Pictured Rocks National Lakeshore near Munising, Michigan. Park managers’ concerns for the integrity of historic buildings at the northern periphery of the point during the rising lake levels in the mid-1980s greatly elevated the priority of research into the geomorphic history and age of Sand Point. To pursue this priority, we recovered sediment cores from four ponds on Sand Point, assessed subsurface stratigraphy onshore and offshore using geophysical techniques, and interpreted the chronology of events using radiocarbon and luminescence dating. Sand Point formed at the southwest edge of a subaqueous platform whose base is probably constructed of glacial diamicton and outwash. During the post-glacial Nipissing Transgression, the base was mantled with sand derived from erosion of adjacent sandstone cliffs. An aerial photograph time sequence, 1939–present, shows that the periphery of the platform has evolved considerably during historical time, infl uenced by transport of sediment into adjacent South Bay. Shallow seismic refl ections suggest slump blocks along the leading edge of the platform. Light detection and ranging (LiDAR) and shallow seismic refl ections to the northwest of the platform reveal large sand waves within a deep (12 m) channel produced by currents fl owing episodically to the northeast into Lake Superior. Ground-penetrating radar profi les show transport and deposition of sand across the upper surface of the platform. Basal radiocarbon dates from ponds between subaerial beach ridges range in age from 540 to 910 cal yr B.P., suggesting that Sand Point became emergent during the last ~1000 years, upon the separation of Lake Superior from Lakes Huron and Michigan. However, optically stimulated luminescence (OSL) ages from the beach ridges were two to three times as old as the radiocarbon ages, implying that emergence of Sand Point may have begun

  11. The impact of vascular factors on language localization in the superior temporal sulcus.

    Science.gov (United States)

    Wilson, Stephen M

    2014-08-01

    The left superior temporal sulcus (STS) has been shown in numerous functional imaging studies to be a critical region for language processing, as it is reliably activated when language comprehension is compared with acoustically matched control conditions. Studies in non-human primates have demonstrated several subdivisions in the STS, yet the precise region(s) within the STS that are important for language remain unclear, in large part because the presence of draining veins in the sulcus makes it difficult to determine whether neural activity is localized to the dorsal or ventral bank of the sulcus. We used functional MRI to localize language regions, and then acquired several additional sequences in order to account for the impact of vascular factors. A breath-holding task was used to induce hypercapnia in order to normalize voxel-wise differences in blood oxygen level-dependent (BOLD) responsivity, and veins were identified on susceptibility-weighted and T2*-weighted BOLD images, and masked out. We found that the precise locations of language areas in individual participants were strongly influenced by vascular factors, but that these vascular effects could be ameliorated by hypercapnic normalization and vein masking. After these corrections were applied, the majority of regions activated by language processing were localized to the dorsal bank of the STS.

  12. The use of stereotypical images of Africa in fundraising campaigns ...

    African Journals Online (AJOL)

    Journal Home > Vol 11, No 1 (2013) > ... The marketing company had no ethical hesitations in designing this campaign, although they received some hindrances from ... The used images consolidate the status quo of the European superiority.

  13. Recurrent cerebral venous infarcts and superior vena cava obstruction: case report

    Energy Technology Data Exchange (ETDEWEB)

    Bozzao, A. [Department of Radiology, University of Rome ``Tor Vergata``, Rome (Italy)]|[Istituto di Radiologia, Ospedale S. Eugenio, Piazzale dell`Umanesimo 10 I-00144 Roma (Italy); Gallucci, M. [Department of Neuroradiology, University of L`Aquila, L`Aquila (Italy); Marsili, L. [Department of Neuroradiology, University of L`Aquila, L`Aquila (Italy); Cerone, G. [Department of Neurology, Collemaggio Hospital, L`Aquila (Italy)

    1997-06-01

    We report a patient with repeated venous infarcts in the occipital lobe and occlusion of the superior vena cava. The pathogenetic relationships between the superior vena cava occlusion and the brain infarcts are discussed. High pressure in the superior venous territory and incomplete patency of the transverse sinus are probably responsible for the venous infarcts. (orig.). With 4 figs.

  14. Superiority of Bessel function over Zernicke polynomial as base function for radial expansion in tomographic reconstruction

    Indian Academy of Sciences (India)

    A K Chattopadhyay; C V S Rao

    2003-07-01

    Here we describe the superiority of Bessel function as base function for radial expansion over Zernicke polynomial in the tomographic reconstruction technique. The causes for the superiority have been described in detail. The superiority has been shown both with simulated data for Kadomtsev’s model for saw-tooth oscillation and real experimental x-ray data from W7-AS Stellarator.

  15. File list: Pol.Neu.05.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available Pol.Neu.05.AllAg.Superior_Cervical_Ganglion mm9 RNA polymerase Neural Superior Cerv...ical Ganglion http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/Pol.Neu.05.AllAg.Superior_Cervical_Ganglion.bed ...

  16. File list: Oth.Neu.10.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available Oth.Neu.10.AllAg.Superior_Cervical_Ganglion mm9 TFs and others Neural Superior Cerv...ical Ganglion SRX435084 http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/Oth.Neu.10.AllAg.Superior_Cervical_Ganglion.bed ...

  17. File list: DNS.Neu.20.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available DNS.Neu.20.AllAg.Superior_Cervical_Ganglion mm9 DNase-seq Neural Superior Cervical ...Ganglion http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/DNS.Neu.20.AllAg.Superior_Cervical_Ganglion.bed ...

  18. File list: ALL.Neu.50.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available ALL.Neu.50.AllAg.Superior_Cervical_Ganglion mm9 All antigens Neural Superior Cervic...al Ganglion SRX435084,SRX435085 http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/ALL.Neu.50.AllAg.Superior_Cervical_Ganglion.bed ...

  19. File list: Unc.Neu.50.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available Unc.Neu.50.AllAg.Superior_Cervical_Ganglion mm9 Unclassified Neural Superior Cervic...al Ganglion http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/Unc.Neu.50.AllAg.Superior_Cervical_Ganglion.bed ...

  20. File list: DNS.Neu.05.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available DNS.Neu.05.AllAg.Superior_Cervical_Ganglion mm9 DNase-seq Neural Superior Cervical ...Ganglion http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/DNS.Neu.05.AllAg.Superior_Cervical_Ganglion.bed ...

  1. File list: Oth.Neu.20.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available Oth.Neu.20.AllAg.Superior_Cervical_Ganglion mm9 TFs and others Neural Superior Cerv...ical Ganglion SRX435084 http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/Oth.Neu.20.AllAg.Superior_Cervical_Ganglion.bed ...

  2. File list: Pol.Neu.10.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available Pol.Neu.10.AllAg.Superior_Cervical_Ganglion mm9 RNA polymerase Neural Superior Cerv...ical Ganglion http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/Pol.Neu.10.AllAg.Superior_Cervical_Ganglion.bed ...

  3. File list: His.Neu.20.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available His.Neu.20.AllAg.Superior_Cervical_Ganglion mm9 Histone Neural Superior Cervical Ga...nglion http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/His.Neu.20.AllAg.Superior_Cervical_Ganglion.bed ...

  4. File list: DNS.Neu.50.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available DNS.Neu.50.AllAg.Superior_Cervical_Ganglion mm9 DNase-seq Neural Superior Cervical ...Ganglion http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/DNS.Neu.50.AllAg.Superior_Cervical_Ganglion.bed ...

  5. File list: Pol.Neu.50.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available Pol.Neu.50.AllAg.Superior_Cervical_Ganglion mm9 RNA polymerase Neural Superior Cerv...ical Ganglion http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/Pol.Neu.50.AllAg.Superior_Cervical_Ganglion.bed ...

  6. File list: His.Neu.50.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available His.Neu.50.AllAg.Superior_Cervical_Ganglion mm9 Histone Neural Superior Cervical Ga...nglion http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/His.Neu.50.AllAg.Superior_Cervical_Ganglion.bed ...

  7. File list: Unc.Neu.10.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available Unc.Neu.10.AllAg.Superior_Cervical_Ganglion mm9 Unclassified Neural Superior Cervic...al Ganglion http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/Unc.Neu.10.AllAg.Superior_Cervical_Ganglion.bed ...

  8. File list: DNS.Neu.10.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available DNS.Neu.10.AllAg.Superior_Cervical_Ganglion mm9 DNase-seq Neural Superior Cervical ...Ganglion http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/DNS.Neu.10.AllAg.Superior_Cervical_Ganglion.bed ...

  9. File list: Unc.Neu.05.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available Unc.Neu.05.AllAg.Superior_Cervical_Ganglion mm9 Unclassified Neural Superior Cervic...al Ganglion http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/Unc.Neu.05.AllAg.Superior_Cervical_Ganglion.bed ...

  10. File list: ALL.Neu.05.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available ALL.Neu.05.AllAg.Superior_Cervical_Ganglion mm9 All antigens Neural Superior Cervic...al Ganglion SRX435084,SRX435085 http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/ALL.Neu.05.AllAg.Superior_Cervical_Ganglion.bed ...

  11. File list: ALL.Neu.10.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available ALL.Neu.10.AllAg.Superior_Cervical_Ganglion mm9 All antigens Neural Superior Cervic...al Ganglion SRX435084,SRX435085 http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/ALL.Neu.10.AllAg.Superior_Cervical_Ganglion.bed ...

  12. File list: Unc.Neu.20.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available Unc.Neu.20.AllAg.Superior_Cervical_Ganglion mm9 Unclassified Neural Superior Cervic...al Ganglion http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/Unc.Neu.20.AllAg.Superior_Cervical_Ganglion.bed ...

  13. File list: Oth.Neu.50.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available Oth.Neu.50.AllAg.Superior_Cervical_Ganglion mm9 TFs and others Neural Superior Cerv...ical Ganglion SRX435084 http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/Oth.Neu.50.AllAg.Superior_Cervical_Ganglion.bed ...

  14. File list: ALL.Neu.20.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available ALL.Neu.20.AllAg.Superior_Cervical_Ganglion mm9 All antigens Neural Superior Cervic...al Ganglion SRX435084,SRX435085 http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/ALL.Neu.20.AllAg.Superior_Cervical_Ganglion.bed ...

  15. File list: Oth.Neu.05.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available Oth.Neu.05.AllAg.Superior_Cervical_Ganglion mm9 TFs and others Neural Superior Cerv...ical Ganglion SRX435084 http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/Oth.Neu.05.AllAg.Superior_Cervical_Ganglion.bed ...

  16. File list: Pol.Neu.20.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available Pol.Neu.20.AllAg.Superior_Cervical_Ganglion mm9 RNA polymerase Neural Superior Cerv...ical Ganglion http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/Pol.Neu.20.AllAg.Superior_Cervical_Ganglion.bed ...

  17. File list: His.Neu.05.AllAg.Superior_Cervical_Ganglion [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available His.Neu.05.AllAg.Superior_Cervical_Ganglion mm9 Histone Neural Superior Cervical Ga...nglion http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/assembled/His.Neu.05.AllAg.Superior_Cervical_Ganglion.bed ...

  18. Superior Sagittal Sinus Thrombosis Complicating Typhoid Fever in a Teenager

    Directory of Open Access Journals (Sweden)

    P. O. Okunola

    2012-01-01

    Full Text Available Cerebral venous sinus (sinovenous thrombosis (CSVT is a rare life-threatening disorder in childhood that is often misdiagnosed. CSVT encompasses cavernous sinus thrombosis, lateral sinus thrombosis, and superior sagittal sinus thrombosis (SSST. We present an adolescent girl who was well until two weeks earlier when she had a throbbing frontal headache and fever with chills; she later had dyspnoea, jaundice, melena stool, multiple seizures, nuchal rigidity, and monoparesis of the right lower limb a day before admission. Urine test for Salmonella typhi Vi antigen was positive, and Widal reaction was significant. Serial cranial computerized tomography scans revealed an expanding hypodense lesion in the parafalcine region consistent with SSST or a parasagittal abscess. Inadvertent left parietal limited craniectomy confirmed SSST. She recovered completely with subsequent conservative management. Beyond neuropsychiatric complications of Typhoid fever, CSVT should be highly considered when focal neurologic deficits are present.

  19. No superior adaptations to carbohydrate periodization in elite endurance athletes

    DEFF Research Database (Denmark)

    Gejl, Kasper Degn; Thams, Line; Hansen, Mette

    2017-01-01

    content (18 ± 5%), CS activity (11 ± 5%) and pACC (38 ± 19%) (Ptraining had no superior effects on performance and muscle...... endurance training, while matched and randomized into two groups training with (Low) or without (High) carbohydrate (CHO) manipulation three days a week. The CHO manipulation days consisted of a 1-hr high intensity bike session in the morning, recovery for 7 hrs while consuming isocaloric diets containing...... either high CHO (414±2.4 g) or low CHO (79.5±1.0 g), and a 2-hr moderate bike session in the afternoon with or without CHO. VO2max, maximal fat oxidation and power output during a 30-min time trial (TT) were determined before and after the training period. The TT was undertaken after 90 mins...

  20. Superior optical nonlinearity of an exceptional fluorescent stilbene dye

    Energy Technology Data Exchange (ETDEWEB)

    He, Tingchao [College of Physics Science and Technology, Shenzhen University, Shenzhen 518060 (China); Division of Physics and Applied Physics, Centre for Disruptive Photonic Technologies (CDPT), School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371 (Singapore); Sreejith, Sivaramapanicker; Zhao, Yanli [Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371 (Singapore); Gao, Yang; Grimsdale, Andrew C. [School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore 639798 (Singapore); Lin, Xiaodong, E-mail: linxd@szu.edu.cn, E-mail: hdsun@ntu.edu.sg [College of Physics Science and Technology, Shenzhen University, Shenzhen 518060 (China); Sun, Handong, E-mail: linxd@szu.edu.cn, E-mail: hdsun@ntu.edu.sg [Division of Physics and Applied Physics, Centre for Disruptive Photonic Technologies (CDPT), School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371 (Singapore)

    2015-03-16

    Strong multiphoton absorption and harmonic generation in organic fluorescent chromophores are, respectively, significant in many fields of research. However, most of fluorescent chromophores fall short of the full potential due to the absence of the combination of such different nonlinear upconversion behaviors. Here, we demonstrate that an exceptional fluorescent stilbene dye could exhibit efficient two- and three-photon absorption under the excitation of femtosecond pulses in solution phase. Benefiting from its biocompatibility and strong excited state absorption behavior, in vitro two-photon bioimaging and superior optical limiting have been exploited, respectively. Simultaneously, the chromophore could generate efficient three-photon excited fluorescence and third-harmonic generation (THG) when dispersed into PMMA film, circumventing the limitations of classical fluorescent chromophores. Such chromophore may find application in the production of coherent light sources of higher photon energy. Moreover, the combination of three-photon excited fluorescence and THG can be used in tandem to provide complementary information in biomedical studies.

  1. Superior optical nonlinearity of an exceptional fluorescent stilbene dye

    Science.gov (United States)

    He, Tingchao; Sreejith, Sivaramapanicker; Gao, Yang; Grimsdale, Andrew C.; Zhao, Yanli; Lin, Xiaodong; Sun, Handong

    2015-03-01

    Strong multiphoton absorption and harmonic generation in organic fluorescent chromophores are, respectively, significant in many fields of research. However, most of fluorescent chromophores fall short of the full potential due to the absence of the combination of such different nonlinear upconversion behaviors. Here, we demonstrate that an exceptional fluorescent stilbene dye could exhibit efficient two- and three-photon absorption under the excitation of femtosecond pulses in solution phase. Benefiting from its biocompatibility and strong excited state absorption behavior, in vitro two-photon bioimaging and superior optical limiting have been exploited, respectively. Simultaneously, the chromophore could generate efficient three-photon excited fluorescence and third-harmonic generation (THG) when dispersed into PMMA film, circumventing the limitations of classical fluorescent chromophores. Such chromophore may find application in the production of coherent light sources of higher photon energy. Moreover, the combination of three-photon excited fluorescence and THG can be used in tandem to provide complementary information in biomedical studies.

  2. superior o atractivo artilugio estético?

    Directory of Open Access Journals (Sweden)

    Miguel Angel Munive Villanueva

    2007-01-01

    Full Text Available En este ensayo se presenta un análisis de la acreditación bajo la idea de que es el mejor instrumento para fortalecer la mejora de la calidad de la educación superior, lo que da lugar a la reflexión sobre la manera en que se logran sus objetivos y resultados. Este preámbulo es la pauta que sirve para abordar la acreditación no como la simple conquista o adjudicación de una constancia de un órgano o instancia acreditadora, poniendo de realce que la efectividad y trascendencia de la acreditación, y particularmente de la evaluación, radica en su integración formal a los procesos de planeación de las tareas académicas y de apoyo de las entidades académicas.

  3. Phonetic Feature Encoding in Human Superior Temporal Gyrus

    Science.gov (United States)

    Mesgarani, Nima; Cheung, Connie; Johnson, Keith; Chang, Edward F.

    2015-01-01

    During speech perception, linguistic elements such as consonants and vowels are extracted from a complex acoustic speech signal. The superior temporal gyrus (STG) participates in high-order auditory processing of speech, but how it encodes phonetic information is poorly understood. We used high-density direct cortical surface recordings in humans while they listened to natural, continuous speech to reveal the STG representation of the entire English phonetic inventory. At single electrodes, we found response selectivity to distinct phonetic features. Encoding of acoustic properties was mediated by a distributed population response. Phonetic features could be directly related to tuning for spectrotemporal acoustic cues, some of which were encoded in a nonlinear fashion or by integration of multiple cues. These findings demonstrate the acoustic-phonetic representation of speech in human STG. PMID:24482117

  4. ENSINO SUPERIOR E OS PARADIGMAS DA POLÍTICA NEOLIBERAL

    OpenAIRE

    Hebert de Melo

    2010-01-01

    Este artigo científico procurou investigar o processo de adaptação da Universidade Brasileira aos novos paradigmas impostos pelas políticas neoliberais. A análise se faz a partir de breve histórico do liberalismo e de suas imbricações no ensino. Apontando também a relativização da suposta democratização e modernização do ensino pelas novas perspectivas impostas pelo mercado. São levantadas também questões como autonomia universitária e legitimação da instituição de ensino superior....

  5. Superhydrophobic paper with superior stability against deformations and humidity

    Science.gov (United States)

    Wang, Nan; Xiong, Dangsheng; Pan, Sai; Deng, Yaling; Shi, Yan; Wang, Kun

    2016-12-01

    Superhydrophobic coatings on paper were achieved by means of incorporating micro-nano hierarchical topography, where the water droplet was repelled and rested in a spherical shape. A silica sol, which was prepared using tetraethylorthosilicate (TEOS) as precursor and trimethylethoxysilane (TMES) as co-precursor, was poured on the paper to form a superhydrophobic surface. The coating was fluorine-free, environmentally friend, and could be easily fabricated on different kinds of papers. Besides, the transmittance of prepared coating reached up to 92% in visible light range, and the words on treated paper showed a good visualization. Moreover, the treated paper showed superior mechanical durability against 100 times of deformation, remarkable stability towards both the acidic and basic solutions. The treated paper could withstand 70 cycles of water condensation test (from 60 °C, 90% relative humidity to 10 °C) without losing superhydrophobicity, suggesting a long-term protection for paper.

  6. Firm-specific information, analysts’ superiority and investment value

    Institute of Scientific and Technical Information of China (English)

    Lu; Li; Erjia; Yang; Tusheng; Xiao

    2014-01-01

    Using a sample of Chinese security analysts’recommendations from 2005 to2010,we examine the source of analysts’superiority and the investment value of their recommendations.Using a calendar-time portfolio approach,we find that,on average,analysts’recommendations are valuable and that analysts are better at analyzing and transferring firm-specific information than market-wide or industry-level information.In addition,we show that the investment value of recommendations increases as firm-specific information becomes more important in stock pricing.Our empirical results are useful in guiding investors and helping brokerage houses to evaluate the output of research departments.

  7. Phonetic feature encoding in human superior temporal gyrus.

    Science.gov (United States)

    Mesgarani, Nima; Cheung, Connie; Johnson, Keith; Chang, Edward F

    2014-02-28

    During speech perception, linguistic elements such as consonants and vowels are extracted from a complex acoustic speech signal. The superior temporal gyrus (STG) participates in high-order auditory processing of speech, but how it encodes phonetic information is poorly understood. We used high-density direct cortical surface recordings in humans while they listened to natural, continuous speech to reveal the STG representation of the entire English phonetic inventory. At single electrodes, we found response selectivity to distinct phonetic features. Encoding of acoustic properties was mediated by a distributed population response. Phonetic features could be directly related to tuning for spectrotemporal acoustic cues, some of which were encoded in a nonlinear fashion or by integration of multiple cues. These findings demonstrate the acoustic-phonetic representation of speech in human STG.

  8. [Human interaction, social cognition, and the superior temporal sulcus].

    Science.gov (United States)

    Brunelle, Francis; Saitovitch, Anna; Boddaert, Nathalie; Grevent, David; Cambier, Jean; Lelord, Gilbert; Samson, Yves; Zilbovicius, Monica

    2013-01-01

    Human beings are social animals. This ability to live together is ensured by cognitive functions, the neuroanatomical bases of which are starting to be unraveled by MRI-based studies. The regions and network engaged in this process are known as the "social brain ". The core of this network is the superior temporal sulcus (STS), which integrates sensory and emotional inputs. Modeling studies of healthy volunteers have shown the role of the STS.in recognizing others as biological beings, as well as facial and eye-gaze recognition, intentionality and emotions. This cognitive capacity has been described as the "theory of mind ". Pathological models such as autism, in which the main clinical abnormality is altered social abilities and communication, have confirmed the role of the STS in the social brain. Conceptualisation of this empathic capacity has been described as "meta cognition ", which forms the basis of human social organizationand culture.

  9. Mediastinal seminoma presenting with superior vena cava syndrome.

    Science.gov (United States)

    Wanous, Amanda; McPhail, Ian R; Quevedo, J Fernando; Sandhu, Nicole P

    2017-06-08

    We present a rare cause of superior vena cava syndrome (SVC) in a previously healthy male aged 31 years. Malignancy was suspected due to unintentional weight loss and childhood exposure to radioactive fallout from a nuclear facility accident. A very large anterior mediastinal mass was identified and demonstrated to be an extragonadal seminoma. Extragonadal germ cell tumours are rare tumours with a high potential for cardiovascular, pulmonary and vascular sequelae. Studies have documented an increased risk of developing seminoma in patients with radioactive exposure. Chemotherapy was initiated, during which the patient experienced progressive and new symptoms, found to be due to extensive thromboembolic disease, which responded well to anticoagulation. Seventy-two months after completing chemotherapy, without need for surgical management, he remains free of the disease. © BMJ Publishing Group Ltd (unless otherwise stated in the text of the article) 2017. All rights reserved. No commercial use is permitted unless otherwise expressly granted.

  10. Voice range in superior laryngeal nerve paresis and paralysis.

    Science.gov (United States)

    Eckley, C A; Sataloff, R T; Hawkshaw, M; Spiegel, J R; Mandel, S

    1998-09-01

    Evaluation of Physiologic Frequency Range (PFR) and Musical Frequency Range (MRP) of Phonation was performed on 56 adults (singers and nonsingers) presenting with superior laryngeal nerve (SLN) paresis or paralysis confirmed by laryngeal electromyography. The most common etiology was neuritis (69.7%), followed by iatrogenic and unknown causes,each accounting for 10.2% of cases, and finally trauma (8.9%). Both female and male singers with SLN paresis or paralysis had significantly higher PFR and MPR than nonsingers. Female classical singers presented PFR and MPR of up to 10 semitones (ST) higher than nonclassical singers and nonsingers. The lowest PFR and musical ranges were found in patients with SLN paresis associated with recurrent laryngeal nerve paresis or paralysis. The authors suggest that voice range measurement is a useful parameter for analyzing the effects of SLN paresis or paralysis on voice and that it may also assist in measuring outcome following voice therapy.

  11. Ensino superior, para quê? Higher education, what for?

    Directory of Open Access Journals (Sweden)

    Henry Giroux

    2010-05-01

    Full Text Available O texto propõe retomar a universidade democrática como referência ética, em face dos desafios do mundo globalizado. Discute a situação atual das universidades, caracterizada como uma crise mundial no Ensino Superior, tendo como referência as IES dos Estados Unidos da América e do Canadá. São destacados três aspectos nessa questão-problema: 1- as consequências do movimento de globalização, que atinge todas as esferas da vida humana, entre elas a educação, e demandam do Ensino Superior o exercício da função de educar as gerações futuras para enfrentar os desafios de uma democracia global, evitando adotar a prática da indução dos professores e alunos à instrumentalização e ao imediatismo, subvalorizando o conhecimento crítico. 2- a retomada pelas universidades de seus objetivos de conhecimento e autonomia, posicionando-se contra a instrumentalização, a mercantilização e a militarização, essa última, como monitoramento de diferentes sujeitos sociais, e do Estado, exercidos sobre as IES. Para isso, propõe a colaboração inclusiva como uma das principais formas de divulgação da universidade e da importância da liberdade e da autonomia da Instituição Superior em suas decisões e ações. 3- a universidade acessível a todos que, além de possibilitar o desenvolvimento de uma educação crítica e de uma cultura intelectual verdadeira, adota metodologias prazerosas, estimulantes e capacitadoras, e valoriza os professores extinguindo os "contratos alternativos de trabalho" que têm contribuído para o empobrecimento da qualidade do Ensino Superior.The text proposes to reinstitute the democratic university as an ethic reference, given the challenges of the globalized world. It discusses the universities' current situation, which is characterized as a global crisis in higher education, taking as reference American and Canadian higher education institutions. Three aspects of such characterization are highlighted: 1

  12. ENSINO SUPERIOR E OS PARADIGMAS DA POLÍTICA NEOLIBERAL

    Directory of Open Access Journals (Sweden)

    Hebert de Melo

    2010-07-01

    Full Text Available Este artigo científico procurou investigar o processo de adaptação da Universidade Brasileira aos novos paradigmas impostos pelas políticas neoliberais. A análise se faz a partir de breve histórico do liberalismo e de suas imbricações no ensino. Apontando também a relativização da suposta democratização e modernização do ensino pelas novas perspectivas impostas pelo mercado. São levantadas também questões como autonomia universitária e legitimação da instituição de ensino superior.

  13. Chronic dissection of the superior mesenteric artery: case report

    Energy Technology Data Exchange (ETDEWEB)

    Common, A.A.; Pressacco, J. [Univ. of Toronto, St. Michael' s Hospital, Dept. of Medical Imaging, Toronto, Ontario (Canada)

    1999-02-01

    Acute dissection of the thoracic aorta is a well-recognized, often fatal condition that frequently extends to involve the abdominal aorta and iliac vessels. The ostia of the renal and mesenteric vessels may be compromised, and the resulting visceral ischemia may necessitate surgical intervention. However, visceral perfusion may be restored if blood flow from true to false lumen is re-established or if the false lumen is obliterated, either spontaneously or by surgical or interventional techniques. Isolated dissections of mesenteric, renal, and carotid vessels are rarely reported. These may be spontaneous, related to high blood pressure and underlying disease of the vessel wall, or caused by abdominal trauma or medical intervention, including angiographic procedures. They are usually associated with pain and other signs and symptoms of ischemia in the appropriate territory. We present a case of chronic superior mesenteric artery (SMA) dissection, an incidental angiographic finding, in an asymptomatic patient being evaluated for resection of an abdominal aortic aneurysm (AAA). (author)

  14. ESTUDIO DEL BULLYING EN EL CICLO SUPERIOR DE PRIMARIA

    Directory of Open Access Journals (Sweden)

    Rosario Ruiz Arroyo

    2015-01-01

    Full Text Available Nuestra investigación trata el fenómeno del bullying en el ciclo superior de primaria. Para llevarla a cabo, hemos elaborado un cuestionario ad hoc a partir de una revisión bibliográfica de diferentes investigaciones en las que se han utilizado varios instrumentos, pruebas, cuestionarios... Este instrumento nos ha servido para analizar diferentes temas: la percepción que tienen los niños de ciclo superior sobre el bullying, en qué escenarios del centro escolar se producen más estos comportamientos, los diferentes tipos de bullying (físico, verbal y exclusión social y cuáles se producen más a menudo y analizar las respuestas que nos dan los alumnos en función del género y del curso (5.º y 6.º. Los resultados que hemos obtenido muestran, entre otras cosas: que en los niños se da más el bullying físico, mientras que en las niñas predomina el de tipo verbal y exclusión social; que la única diferencia según el curso es que en 6.º curso se da más exclusión social que en 5.º curso; y que donde se producen más conductas de bullying es en el patio, seguido del aula cuando no se encuentra el docente. Finalmente, partiendo de los resultados obtenidos, hemos elaborado unas propuestas de actuación psicopedagógicas para mejorar la convivencia en la escuela y otros espacios educativos.

  15. en la educación superior mexicana

    Directory of Open Access Journals (Sweden)

    César Mureddu Torres

    2006-01-01

    Full Text Available El presente escrito contempla algunas nociones de relativa novedad en el marco de nuestra política nacional, incluida la política educativa de nivel superior, es el caso concreto de la expresión, ahora tan frecuente políticas públicas. Indaga en torno a los principales impulsores que dieron origen a diversas decisiones que afectaron a la comunidad académica en su quehacer cotidiano. Hace ver que en muchas ocasiones la decisión política responde a requerimientos que proceden de actividades pertenecientes a núcleos más estructurados del actuar público. Tal es el caso de la relación entre las esferas de lo político en su intersección con lo económico. El estudio hace ver también que de esta intersección han surgido la mayor parte de las decisiones que han afectado en lo público al quehacer académico, sin que las motivaciones que llevaron a ese tipo de decisiones hayan sido consensadas, develadas y transparentes, sobre todo en lo que se refiere a sus consecuencias para la mejoría o deterioro de las actividades a regular por tales políticas. Se interroga, entonces, sobre el tipo de consecuencias que han tenido para con el actuar de esta comunidad académica las políticas públicas sobre la educación superior y la respuesta está en el título de este artículo.

  16. Educación superior, movilidad social y desigualdades interdependientes

    Directory of Open Access Journals (Sweden)

    Lorenza Villa Lever

    2016-01-01

    Full Text Available En el contexto de la globalización económica, la educación superior ha redefinido los espacios institucionales para la producción del conocimiento exigiendo una mayor competitividad de las universidades, lo que ha propiciado asimetrías en su desarrollo, ya que a partir de sus respuestas, algunas han mostrado capacidad para responder a la llamada sociedad del conocimiento, mientras que otras se han concretado a dar respuesta a las necesidades precisas del mercado local. Con ese telón de fondo, en este trabajo se analizarán cuatro aspectos de estas transformaciones en América Latina: la ampliación de la matrícula de educación superior, su distribución por estrato social y género, el proceso de segmentación institucional que ha acompañado ese proceso de crecimiento, y las percepciones de los estudiantes sobre su situación, comparada a la de sus padres. Para el análisis se trabajará con dos conceptos: el de movilidad social y el de desigualdades interdependientes. Se parte del supuesto de que a medida que el nivel de bienestar de los hijos dependa del origen socioeconómico de la familia de origen, habrá mayor reducción en las libertades efectivas en la sociedad en su conjunto, y por tanto, mayores limites a las posibilidades reales de que los individuos que provienen de hogares desfavorecidos logren la vida que desean. El trabajo está organizado en tres partes: en la primera se ubica el problema de la movilidad social en América Latina; después se exponen los resultados de una investigación empírica con estudiantes universitarios en Mé- xico; y finalmente se presentan algunas conclusiones.

  17. Pure word deafness with auditory object agnosia after bilateral lesion of the superior temporal sulcus.

    Science.gov (United States)

    Gutschalk, Alexander; Uppenkamp, Stefan; Riedel, Bernhard; Bartsch, Andreas; Brandt, Tobias; Vogt-Schaden, Marlies

    2015-12-01

    Based on results from functional imaging, cortex along the superior temporal sulcus (STS) has been suggested to subserve phoneme and pre-lexical speech perception. For vowel classification, both superior temporal plane (STP) and STS areas have been suggested relevant. Lesion of bilateral STS may conversely be expected to cause pure word deafness and possibly also impaired vowel classification. Here we studied a patient with bilateral STS lesions caused by ischemic strokes and relatively intact medial STPs to characterize the behavioral consequences of STS loss. The patient showed severe deficits in auditory speech perception, whereas his speech production was fluent and communication by written speech was grossly intact. Auditory-evoked fields in the STP were within normal limits on both sides, suggesting that major parts of the auditory cortex were functionally intact. Further studies showed that the patient had normal hearing thresholds and only mild disability in tests for telencephalic hearing disorder. Prominent deficits were discovered in an auditory-object classification task, where the patient performed four standard deviations below the control group. In marked contrast, performance in a vowel-classification task was intact. Auditory evoked fields showed enhanced responses for vowels compared to matched non-vowels within normal limits. Our results are consistent with the notion that cortex along STS is important for auditory speech perception, although it does not appear to be entirely speech specific. Formant analysis and single vowel classification, however, appear to be already implemented in auditory cortex on the STP. Copyright © 2015 Elsevier Ltd. All rights reserved.

  18. Otic capsule dehiscence syndrome: Superior semicircular canal dehiscence syndrome with no radiographically visible dehiscence.

    Science.gov (United States)

    Wackym, P Ashley; Wood, Scott J; Siker, David A; Carter, Dale M

    2015-08-01

    We conducted a prospective longitudinal study of two cohorts of patients who had superior semicircular canal dehiscence syndrome (SSCDS); one group had radiographically confirmed superior canal dehiscence (SCD), and the other exhibited no identified otic capsule dehiscence on imaging (no-iOCD). We compiled data obtained from prospective structured symptomatology interviews; diagnostic studies; three-dimensional, high-resolution, temporal bone computed tomography; and a retrospective case review from our tertiary care referral center. Eleven adults and 1 child with SSCDS were identified, surgically managed, and followed. Six of these patients-1 man and 5 women, aged 29 to 54 years at first surgery (mean: 41.8)-had radiologically confirmed SCD. The other 6 patients-1 man, 4 women, and 1 girl, aged 1 to 51 years (mean: 32.2)-had no-iOCD. The 6 adults with SCD underwent surgery via a middle cranial fossa approach with plugging procedures. The 5 adults and 1 child with no-iOCD underwent round window reinforcement (RWR) surgery. One SCD patient developed no-iOCD 1.5 years after SCD surgery, and she subsequently underwent RWR surgery. Our main outcome measures were patient symptomatology (with video documentation) and the results of diagnostic studies. Other than the character of migraine headaches, there was no difference in preoperative symptomatology between the two groups. Postoperatively, resolution of SSCDS symptoms ultimately occurred in all patients. Both the SCD and the no-iOCD groups experienced a highly significant improvement in postural control following treatment (Wilcoxon signed rank test, p syndrome more accurately reflects the clinical syndrome of SSCDS since it includes both superior semicircular canal dehiscence and no-iOCD, as well as posterior and lateral semicircular canal dehiscence, all of which can manifest as SSCDS. We have also included links to videos in which 4 of the SSCDS patients with no-iOCD in this study discussed their symptoms and the

  19. Microscopic Halftone Image Segmentation

    Institute of Scientific and Technical Information of China (English)

    WANG Yong-gang; YANG Jie; DING Yong-sheng

    2004-01-01

    Microscopic halftone image recognition and analysis can provide quantitative evidence for printing quality control and fault diagnosis of printing devices, while halftone image segmentation is one of the significant steps during the procedure. Automatic segmentation on microscopic dots by the aid of the Fuzzy C-Means (FCM) method that takes account of the fuzziness of halftone image and utilizes its color information adequately is realized. Then some examples show the technique effective and simple with better performance of noise immunity than some usual methods. In addition, the segmentation results obtained by the FCM in different color spaces are compared, which indicates that the method using the FCM in the f1f2f3 color space is superior to the rest.

  20. Combined Double Sleeve Lobectomy and Superior Vena Cava Resection for Non-small Cell Lung Cancer with Persistent Left Superior Vena Cava

    Institute of Scientific and Technical Information of China (English)

    Daxing ZHU; Xiaoming QIU; Qinghua ZHOU

    2015-01-01

    A 65-year-old man with right central type of lung squamous carcinoma was admitted to our department. Bronchoscopy displayed complete obstruction of right upper lobe bronchus and inifltration of the bronchus intermedius with tumor. Chest contrast computed tomography revealed the tumor invaded right pulmonary artery, superior vena cava, and the persistant letf superior vena cava lfowed into the coronary sinus. hTe tumor was successfully removed by means of bronchial and pulmonary artery sleeve resection of the right upper and middle lobes combined with resection and reconstruction of superior vena cava (SVC) utilizing ringed polytetralfuoroethylene gratf. To the best of our knowledge, this was the ifrst report of complete resection of locally advanced lung cancer involving superior vena cava, right pulmonary artery trunk and main bronchus with persistant letf superior vena cava.

  1. The role of left superior parietal lobe in male sexual behavior: dynamics of distinct components revealed by FMRI.

    Science.gov (United States)

    Cera, Nicoletta; Di Pierro, Ezio D; Sepede, Gianna; Gambi, Francesco; Perrucci, Mauro Gianni; Merla, Arcangelo; Tartaro, Armando; Del Gratta, Cosimo; Galatioto Paradiso, Giuseppe; Vicentini, Carlo; Romani, Gian Luca; Ferretti, Antonio

    2012-06-01

    Despite the interest for the brain correlates of male sexual arousal, few studies investigated neural mechanisms underlying psychogenic erectile dysfunction (ED). Although these studies showed several brain regions active in ED patients during visual erotic stimulation, the dynamics of inhibition of sexual response is still unclear. This study investigated the dynamics of brain regions involved in the psychogenic ED. Functional magnetic resonance imaging (fMRI) and simultaneous penile tumescence (PT) were used to study brain activity evoked in 17 outpatients with psychogenic ED and 19 healthy controls during visual erotic stimulation. Patterns of brain activation related to different phases of sexual response in the two groups were compared. Simultaneous recording of blood oxygen level-dependent fMRI responses and PT during visual erotic stimulation. During visual erotic stimuli, a larger activation was observed for the patient group in the left superior parietal lobe, ventromedial prefrontal cortex, and posterior cingulate cortex, whereas the control group showed larger activation in the right middle insula and dorsal anterior cingulate cortex and hippocampus. Moreover, the left superior parietal lobe showed a larger activation in patients than controls especially during the later stage of sexual response. Our results suggest that, among regions more active in patient group, the left superior parietal lobe plays a crucial role in inhibition of sexual response. Previous studies showed that left superior parietal lobe is involved in monitoring of internal body representation. The larger activation of this region in patients during later stages of sexual response suggests a high monitoring of the internal body representation, possibly affecting the behavioral response. These findings provide insight on brain mechanisms involved in psychogenic ED. © 2012 International Society for Sexual Medicine.

  2. Human arachnoid granulations Part I: a technique for quantifying area and distribution on the superior surface of the cerebral cortex

    Directory of Open Access Journals (Sweden)

    Holman David W

    2007-07-01

    Full Text Available Abstract Background The arachnoid granulations (AGs are herniations of the arachnoid membrane into the dural venous sinuses on the surface of the brain. Previous morphological studies of AGs have been limited in scope and only one has mentioned surface area measurements. The purpose of this study was to investigate the topographic distribution of AGs on the superior surface of the cerebral cortex. Methods En face images were taken of the superior surface of 35 formalin-fixed human brains. AGs were manually identified using Adobe Photoshop, with a pixel location containing an AG defined as 'positive'. A set of 25 standard fiducial points was marked on each hemisphere for a total of 50 points on each image. The points were connected on each hemisphere to create a segmented image. A standard template was created for each hemisphere by calculating the average position of the 25 fiducial points from all brains. Each segmented image was mapped to the standard template using a linear transformation. A topographic distribution map was produced by calculating the proportion of AG positive images at each pixel in the standard template. The AG surface area was calculated for each hemisphere and for the total brain superior surface. To adjust for different brain sizes, the proportional involvement of AGs was calculated by dividing the AG area by the total area. Results The total brain average surface area of AGs was 78.53 ± 13.13 mm2 (n = 35 and average AG proportional involvement was 57.71 × 10-4 ± 7.65 × 10-4. Regression analysis confirmed the reproducibility of AG identification between independent researchers with r2 = 0.97. The surface AGs were localized in the parasagittal planes that coincide with the region of the lateral lacunae. Conclusion The data obtained on the spatial distribution and en face surface area of AGs will be used in an in vitro model of CSF outflow. With an increase in the number of samples, this analysis technique can be used

  3. 3D photoacoustic imaging

    Science.gov (United States)

    Carson, Jeffrey J. L.; Roumeliotis, Michael; Chaudhary, Govind; Stodilka, Robert Z.; Anastasio, Mark A.

    2010-06-01

    Our group has concentrated on development of a 3D photoacoustic imaging system for biomedical imaging research. The technology employs a sparse parallel detection scheme and specialized reconstruction software to obtain 3D optical images using a single laser pulse. With the technology we have been able to capture 3D movies of translating point targets and rotating line targets. The current limitation of our 3D photoacoustic imaging approach is its inability ability to reconstruct complex objects in the field of view. This is primarily due to the relatively small number of projections used to reconstruct objects. However, in many photoacoustic imaging situations, only a few objects may be present in the field of view and these objects may have very high contrast compared to background. That is, the objects have sparse properties. Therefore, our work had two objectives: (i) to utilize mathematical tools to evaluate 3D photoacoustic imaging performance, and (ii) to test image reconstruction algorithms that prefer sparseness in the reconstructed images. Our approach was to utilize singular value decomposition techniques to study the imaging operator of the system and evaluate the complexity of objects that could potentially be reconstructed. We also compared the performance of two image reconstruction algorithms (algebraic reconstruction and l1-norm techniques) at reconstructing objects of increasing sparseness. We observed that for a 15-element detection scheme, the number of measureable singular vectors representative of the imaging operator was consistent with the demonstrated ability to reconstruct point and line targets in the field of view. We also observed that the l1-norm reconstruction technique, which is known to prefer sparseness in reconstructed images, was superior to the algebraic reconstruction technique. Based on these findings, we concluded (i) that singular value decomposition of the imaging operator provides valuable insight into the capabilities of

  4. Spatial determinants of multisensory integration in cat superior colliculus neurons.

    Science.gov (United States)

    Meredith, M A; Stein, B E

    1996-05-01

    1. Although a representation of multisensory space is contained in the superior colliculus, little is known about the spatial requirements of multisensory stimuli that influence the activity of neurons here. Critical to this problem is an assessment of the registry of the different receptive fields within individual multisensory neurons. The present study was initiated to determine how closely the receptive fields of individual multisensory neurons are aligned, the physiological role of that alignment, and the possible functional consequences of inducing receptive-field misalignment. 2. Individual multisensory neurons in the superior colliculus of anesthetized, paralyzed cats were studied with the use of standard extracellular recording techniques. The receptive fields of multisensory neurons were large, as reported previously, but exhibited a surprisingly high degree of spatial coincidence. The average proportion of receptive-field overlap was 86% for the population of visual-auditory neurons sampled. 3. Because of this high degree of intersensory receptive-field correspondence, combined-modality stimuli that were coincident in space tended to fall within the excitatory regions of the receptive fields involved. The result was a significantly enhanced neuronal response in 88% of the multisensory neurons studied. If stimuli were spatially disparate, so that one fell outside its receptive field, either a decreased response occurred (56%), or no intersensory effect was apparent (44%). 4. The normal alignment of the different receptive fields of a multisensory neuron could be disrupted by passively displacing the eyes, pinnae, or limbs/body. In no case was a shift in location or size observed in a neuron's other receptive field(s) to compensate for this displacement. The physiological result of receptive-field misalignment was predictable and based on the location of the stimuli relative to the new positions of their respective receptive fields. Now, for example, one

  5. Escuela superior de Hacienda Pública en Speyer, Alemania

    Directory of Open Access Journals (Sweden)

    Ruf, Sep

    1963-12-01

    Full Text Available The total building program connected with this School comprises the following: 1. The Higher School itself, which has an auditorium, lecture halls, main lecture hall, rooms for scientific work done by professors and their assistants, and the usual administrative offices. 2. Living quarters for the professors and students, living rooms, a club and a flat for the porter. 3. A bar and the kitchen. 4. Garage, servicing station and a bicycle shed. The Higher School is built on a single level, around a central patio-style garden, with a pond in the middle. The library, lecture halls, and working rooms are arranged to face this inner open space. The main lecture hall rises in tiers, to facilitate the view of the speaker, and its roof emerges considerably above the level of the rest of the building, as a dominant feature. The living accommodation is housed in a four storey building. The ground floor contains the club, living rooms, and the professors and porter's flats. The upper three floors are taken up with the students rooms. These are single and double rooms. This project is simply proportioned, and the volumes and planes are very clearly differentiated, to achieve a space pattern of very clearcut outline.El conjunto de instalaciones construidas comprende: — La Escuela Superior propiamente dicha, dotada de los correspondientes auditorio, clase, aula magna, salas para trabajos científicos de profesores y asistentes y la zona de administración. — Viviendas para profesores y cursillistas, salas de estar, club y vivienda del conserje. — Bar con cocina. Garaje con estación de servicio y un local para bicicletas. La Escuela Superior se desarrolla en una sola planta, en la cual, alrededor del patio-jardín—con un estanque—, se hallan la biblioteca, clase, auditorios y salas de trabajo. El aula magna tiene acceso al nivel de suelo, y presenta una disposición escalonada que facilita la visibilidad. Como elemento dominante, este cuerpo se eleva

  6. Concepto de excelencia en enseñanza superior universitaria

    Directory of Open Access Journals (Sweden)

    Eduardo García-Jiménez

    2016-07-01

    Full Text Available La idea de excelencia es consustancial a la enseñanza superior universitaria. A pesar de la diversidad bajo la que se manifiesta, la excelencia está presente en las agendas de las universidades. Los propios cuestionamientos de la capacidad de las universidades para responder al reto de proporcionar una formación avanzada a millones de estudiantes en todo el mundo o para aportar valor añadido a la sociedad y la exigencia de que desarrollen sistemas internos de garantía de la calidad y se sometan a evaluaciones externas, no son sino evidencias de la que la excelencia debería formar parte del ADN de la enseñanza superior universitaria. El concepto de excelencia en la enseñanza es un constructo multidimensional que puede definirse en términos de proceso, producto y meta. En términos de proceso, la excelencia puede definirse a partir de elementos instruccionales vinculados a los métodos de enseñanza, a la evaluación y retroalimentación, a los recursos que hacen excelentes las experiencias de aprendizaje de los estudiantes o la integración de la enseñanza y la investigación. Pero, en la definición del concepto excelencia también intervienen otros elementos menos tangibles como el compromiso académico de estudiantes y profesores o el compromiso de los programas y cursos con la libertad académica y la igualdad. En términos de producto, la excelencia se define a través de indicadores de rendimiento, de satisfacción de los grupos de interés o de responsabilidad social. Pero, en todos los casos, la excelencia es la meta a partir de la que las instituciones universitarias realizan sus planes de futuro y su propia definición de enseñanza.

  7. A Model of the Superior Colliculus Predicts Fixation Locations during Scene Viewing and Visual Search.

    Science.gov (United States)

    Adeli, Hossein; Vitu, Françoise; Zelinsky, Gregory J

    2017-02-08

    Modern computational models of attention predict fixations using saliency maps and target maps, which prioritize locations for fixation based on feature contrast and target goals, respectively. But whereas many such models are biologically plausible, none have looked to the oculomotor system for design constraints or parameter specification. Conversely, although most models of saccade programming are tightly coupled to underlying neurophysiology, none have been tested using real-world stimuli and tasks. We combined the strengths of these two approaches in MASC, a model of attention in the superior colliculus (SC) that captures known neurophysiological constraints on saccade programming. We show that MASC predicted the fixation locations of humans freely viewing naturalistic scenes and performing exemplar and categorical search tasks, a breadth achieved by no other existing model. Moreover, it did this as well or better than its more specialized state-of-the-art competitors. MASC's predictive success stems from its inclusion of high-level but core principles of SC organization: an over-representation of foveal information, size-invariant population codes, cascaded population averaging over distorted visual and motor maps, and competition between motor point images for saccade programming, all of which cause further modulation of priority (attention) after projection of saliency and target maps to the SC. Only by incorporating these organizing brain principles into our models can we fully understand the transformation of complex visual information into the saccade programs underlying movements of overt attention. With MASC, a theoretical footing now exists to generate and test computationally explicit predictions of behavioral and neural responses in visually complex real-world contexts.SIGNIFICANCE STATEMENT The superior colliculus (SC) performs a visual-to-motor transformation vital to overt attention, but existing SC models cannot predict saccades to visually

  8. Superior mesenteric venous thrombosis: a retrospective study of thirteen cases Trombosis de vena mesentérica superior: estudio retrospectivo de trece casos

    Directory of Open Access Journals (Sweden)

    S. Muñoz

    2004-06-01

    Full Text Available Objective: to analyze the epidemiology, associated risk factors, clinical presentation, diagnostic methods, treatment, and evolution of patients diagnosed with superior mesenteric venous thrombosis (SMVT at an university hospital in Madrid. Experimental design: retrospective and descriptive study. We review the medical records of patients with this diagnosis in our hospital from January 1998 to December 2002. Data were processed by using the SPSS vs. 11 software. Patients: all thirteen subjects diagnosed with SMVT in that period were included. Results: associated risk factors included tumoral conditions (5 patients, acute abdominal pathology (2, polyglobulia (1, prothrombin gene mutation (1, and anticardiolipin antibodies (1. No predisposing factor was found in 3 patients. Clinical presentation for all patients was abdominal pain, with nausea and vomiting being the second symptom in frequency (7. The diagnosis was reached by abdominal CT (9, arteriography (2, ultrasounds (1, and histology after intestinal resection (1. Treatment with only anticoagulation was initiated in 4 patients, whereas anticoagulation and surgery were performed in 5 cases. In 4 subjects no specific treatment was prescribed and only palliative measures were established due to a baseline end-stage condition. Five patients died, and four of them had a neoplasic condition as associated risk factor. Mortality in our series was 38.5%. Conclusions: SMVT is a very rare disease that is often associated with neoplasic pathology, which influences its high mortality. Due to non specific symptoms, imaging is essential for the diagnosis and the detection of associated risk factors. In our series, computed tomography imaging was the most profitable test.Objetivo: analizar la epidemiología, factores de riesgo asociados, presentación clínica, métodos diagnósticos, tratamiento y evolución en pacientes diagnosticados de trombosis de vena mesentérica superior (TVMS en un hospital

  9. Imaging of the temporomandibular joint: An update

    Science.gov (United States)

    Bag, Asim K; Gaddikeri, Santhosh; Singhal, Aparna; Hardin, Simms; Tran, Benson D; Medina, Josue A; Curé, Joel K

    2014-01-01

    Imaging of the temporomandibular joint (TMJ) is continuously evolving with advancement of imaging technologies. Many different imaging modalities are currently used to evaluate the TMJ. Magnetic resonance imaging is commonly used for evaluation of the TMJ due to its superior contrast resolution and its ability to acquire dynamic imaging for demonstration of the functionality of the joint. Computed tomography and ultrasound imaging have specific indication in imaging of the TMJ. This article focuses on state of the art imaging of the temporomandibular joint. Relevant normal anatomy and biomechanics of movement of the TMJ are discussed for better understanding of many TMJ pathologies. Imaging of internal derangements is discussed in detail. Different arthropathies and common tumors are also discussed in this article. PMID:25170394

  10. Imaging of the temporomandibular joint: An update

    Institute of Scientific and Technical Information of China (English)

    Asim; K; Bag; Santhosh; Gaddikeri; Aparna; Singhal; Simms; Hardin; Benson; D; Tran; Josue; A; Medina; Joel; K; Curé

    2014-01-01

    Imaging of the temporomandibular joint(TMJ) is continuously evolving with advancement of imaging technologies. Many different imaging modalities are currently used to evaluate the TMJ. Magnetic resonance imaging is commonly used for evaluation of the TMJ due to its superior contrast resolution and its ability to acquire dynamic imaging for demonstration of the functionality of the joint. Computed tomography and ultrasound imaging have specific indication in imaging of the TMJ. This article focuses on state of the art imaging of the temporomandibular joint. Relevant normal anatomy and biomechanics of movement of the TMJ are discussed for better understanding of many TMJ pathologies. Imaging of internal derangements is discussed in detail. Different arthropathies and commontumors are also discussed in this article.

  11. Superior flexibility of a wrinkled carbon shell under electrochemical cycling

    KAUST Repository

    Li, Qianqian

    2014-01-01

    Nanocarbon composites have been extensively employed in engineering alloy-type anodes in order to improve the poor cyclability caused by the enormous volume changes during lithium (Li+) insertion/extraction. The chemical vapor deposited wrinkled carbon shell (WCS) shows high electrical conductivity, excellent thermal stability and remarkable mechanical robustness, which help in retaining the structural integrity around the tin (Sn) anode core despite ∼250% variation in volume during repetitive lithiation and delithiation. In situ transmission electron microscopy reveals no embrittlement in the lithiated WCS, which fully recovers its original shape after severe mechanical deformation with no obvious structural change. Further analysis indicates that the capacity to accommodate large strains is closely related to the construction of the carbon shell, that is, the stacking of wrinkled few-layer graphenes. Both the pre-existing wrinkles and the few-layer thickness render the carbon shell superior flexibility and good elasticity under bending or expansion of the interior volume. Moreover, the WCS possesses fast lithium ion diffusion channels, which have lower activation barriers (∼0.1 eV) than that on a smooth graphene (∼0.3 eV). The results provide an insight into the improvement in cycle performance that can be achieved through carbon coating of anodes of lithium ion batteries. © 2014 The Royal Society of Chemistry.

  12. Funciones superiores en pacientes con accidente cerebro vascular.

    Directory of Open Access Journals (Sweden)

    Felipe Rodríguez

    2009-07-01

    Full Text Available Los estudios realizados en Chile hasta la fecha no permiten detectar de manera significativa el deterioro neuropsicológico causado por el accidente cerebro vascular (ACV y el impacto que éste tiene en el paciente a nivel de su desenvolvimiento diario y familiar. Con base a esto el objetivo de esta investigación fue elaborar un perfil de deterioro neuropsicológico de las diversas funciones cerebrales superiores causado por un ACV, en un grupo de 50 pacientes de la Unidad de Medicina Física del Hospital San José al cuál se le administró un Protocolo de Evaluación Neuropsicológica, comparándose luego con un grupo control de 50 sujetos evaluados con el mismo protocolo. Se encuentra que sobre un 20% de la población con ACV evaluada presenta deterioro en al menos uno de los ítems evaluados, siendo las funciones ejecutivas, la memoria a largo plazo y la memoria a corto plazo las áreas mayoritariamente afectada en la población evaluada.

  13. en estudiantes de educación superior

    Directory of Open Access Journals (Sweden)

    Julio Alfonso Piña López

    2006-01-01

    Full Text Available Se condujo un estudio transversal que tuvo como objetivo evaluar la capacidad de predicción de tres variables psicológicas: conocimientos, creencias y motivos, sobre dos comportamientos relacionadas con el uso de condón en estudiantes de educación superior de ambos sexos. El análisis de varianza en función de la edad arrojó diferencias significativas en la práctica de los dos comportamientos; con la rho de Spearman se encontraron correlaciones altas y significativas entre los motivos y los dos comportamientos, mientras que un análisis de regresión evidenció el poder de predicción de la variable motivos sobre ambos comportamientos. Se destaca la necesidad de analizar el importante papel que dicha variable desempeña en el uso de condón en esa población, especialmente para prevenir la infección por VIH.

  14. Of guns and snakes: testing a modern threat superiority effect.

    Science.gov (United States)

    Subra, Baptiste; Muller, Dominique; Fourgassie, Lisa; Chauvin, Alan; Alexopoulos, Theodore

    2017-02-03

    Previous studies suggest that ancient (i.e. evolutionary-based) threats capture attention because human beings possess an inborn module shaped by evolution and dedicated to their detection. An alternative account proposes that a key feature predicting whether a stimulus will capture attention is its relevance rather than its ontology (i.e. phylogenetic or ontogenetic threat). Within this framework, the present research deals with the attentional capture by threats commonly encountered in our urban environment. In two experiments, we investigate the attentional capture by modern threats (i.e. weapons). In Experiment 1, participants responded to a target preceded by a cue, which was a weapon or a non-threatening stimulus. We found a larger cuing effect (faster reaction times to valid vs. invalid trials) with weapons as compared with non-threatening cues. In Experiment 2, modern (e.g. weapons) and ancient threats (e.g. snakes) were pitted against one another as cues to determine which ones preferentially capture attention. Crucially, participants were faster to detect a target preceded by a modern as opposed to an ancient threat, providing initial evidence for a superiority of modern threat. Overall, the present findings appear more consistent with a relevance-based explanation rather than an evolutionary-based explanation of threat detection.

  15. Inflammatory responses in the rat superior colliculus after eye enucleation.

    Science.gov (United States)

    Hernandes, Marina S; Britto, Luiz R G

    2014-02-01

    Ocular enucleation induces profound morphological alterations in central visual areas. However, little is known about the response of glial cells and possible inflammatory processes in visual brain areas resulting from eye enucleation. In this study, immunoblotting and immunostaining assays revealed increased expression of astrocyte and microglia markers in the rat superior colliculus (SC) between 1 and 15 days after contralateral enucleation. A transient increase of neuronal COX-2 protein expression was also found in the SC. To evaluate the role of an anti-inflammatory drug in attenuating both COX-2 and glial cell activation, the synthetic glucocorticoid dexamethasone (DEX) was administered (1 mg/kg i.p., for 3 days) to enucleated rats. Immunoblotting data revealed that DEX treatment significantly inhibited COX-2 protein expression. Postlesion immunostaining for astrocyte and microglia markers was also significantly reduced by DEX treatment. These findings suggest that the removal of retinal ganglion cell input generates inflammatory responses in central retinorecipient structures. Copyright © 2013 Elsevier Inc. All rights reserved.

  16. A permeabilidade social das carreiras do ensino superior

    Directory of Open Access Journals (Sweden)

    Maria Ligia de Oliveira Barbosa

    Full Text Available Este artigo propõe-se a analisar as diferenças entre cursos pertencentes a três áreas de conhecimento (ciências biológicas, exatas e humanas quanto à sua capacidade para oferecer maior igualdade de oportunidades no momento de expansão e diversificação do ensino superior brasileiro. O estudo foi realizado a partir dos microdados do Exame Nacional de Desempenho dos Estudantes (ENADE, combinando a nota geral da prova às respostas do questionário socioeconômico dos alunos, de forma a avaliar as associações entre o financiamento dos estudos de graduação e o desempenho e permanência nos diferentes cursos. Ao mesmo tempo em que os resultados confirmam as diferenças entre as áreas de conhecimento, também indicam a importância desses mecanismos de custeio das despesas para a finalização dos cursos. Verificam-se diferenças significativas em cada curso quanto ao desempenho associado a cada tipo de bolsa e de financiamento.

  17. El contexto virtual en la educación superior

    Directory of Open Access Journals (Sweden)

    Vera Quintana, Mercedes

    2015-06-01

    Full Text Available El laboratorio virtual constituye el nuevo proceso que trata de imponer sus presupuestos técnicos, organizativos y metodológicos, por tanto, la virtualización de la educación superior durante su relativa corta vida, ha sido ese nuevo paradigma educativo resultante del uso de las tecnologías de la información y las comunicaciones (TIC, como herramienta de mediación en los procesos de aprendizaje. Los espacios virtuales de aprendizaje (EVA han revolucionado los procesos de enseñanza y aprendizaje con la explotación de sus múltiples posibilidades que indudablemente ofrecen una alternativa a los modelos pedagógicos tradicionales. Nuestra modesta propuesta se inserta metodológicamente en lo que serían estas nuevas prácticas educativas con sus correspondientes estrategias para definir el nuevo modelo pedagógico en función de los entornos virtuales.

  18. Autologous chondrocyte implantation: superior biologic properties of hyaline cartilage repairs.

    Science.gov (United States)

    Henderson, Ian; Lavigne, Patrick; Valenzuela, Herminio; Oakes, Barry

    2007-02-01

    Information regarding the quality of autologous chondrocyte implantation repair is needed to determine whether the current autologous chondrocyte implantation surgical technology and the subsequent biologic repair processes are capable of reliably forming durable hyaline or hyaline-like cartilage in vivo. We report and analyze the properties and qualities of autologous chondrocyte implantation repairs. We evaluated 66 autologous chondrocyte implantation repairs in 57 patients, 55 of whom had histology, indentometry, and International Cartilage Repair Society repair scoring at reoperation for mechanical symptoms or pain. International Knee Documentation Committee scores were used to address clinical outcome. Maximum stiffness, normalized stiffness, and International Cartilage Repair Society repair scoring were higher for hyaline articular cartilage repairs compared with fibrocartilage, with no difference in clinical outcome. Reoperations revealed 32 macroscopically abnormal repairs (Group B) and 23 knees with normal-looking repairs in which symptoms leading to arthroscopy were accounted for by other joint disorders (Group A). In Group A, 65% of repairs were either hyaline or hyaline-like cartilage compared with 28% in Group B. Autologous chondrocyte repairs composed of fibrocartilage showed more morphologic abnormalities and became symptomatic earlier than hyaline or hyaline-like cartilage repairs. The hyaline articular cartilage repairs had biomechanical properties comparable to surrounding cartilage and superior to those associated with fibrocartilage repairs.

  19. Delineation of sympatric morphotypes of lake trout in Lake Superior

    Science.gov (United States)

    Moore, Seth A.; Bronte, Charles R.

    2001-01-01

    Three morphotypes of lake trout Salvelinus namaycush are recognized in Lake Superior: lean, siscowet, and humper. Absolute morphotype assignment can be difficult. We used a size-free, whole-body morphometric analysis (truss protocol) to determine whether differences in body shape existed among lake trout morphotypes. Our results showed discrimination where traditional morphometric characters and meristic measurements failed to detect differences. Principal components analysis revealed some separation of all three morphotypes based on head and caudal peduncle shape, but it also indicated considerable overlap in score values. Humper lake trout have smaller caudal peduncle widths to head length and depth characters than do lean or siscowet lake trout. Lean lake trout had larger head measures to caudal widths, whereas siscowet had higher caudal peduncle to head measures. Backward stepwise discriminant function analysis retained two head measures, three midbody measures, and four caudal peduncle measures; correct classification rates when using these variables were 83% for leans, 80% for siscowets, and 83% for humpers, which suggests the measures we used for initial classification were consistent. Although clear ecological reasons for these differences are not readily apparent, patterns in misclassification rates may be consistent with evolutionary hypotheses for lake trout within the Laurentian Great Lakes.

  20. The Anesthetic Effect of Anterior Middle Superior Alveolar Technique (AMSA)

    Science.gov (United States)

    de Souza Tolentino, Lívia; Barbisan Souza, André; Girardi, Ana Alice; Romito, Giuseppe Alexandre; Araújo, Maurício Guimarães

    2015-01-01

    Anesthesia of the soft and hard tissues of the maxilla may require up to 5 injections. Thus, the aim of this study was to evaluate the anesthetic efficacy of the anterior middle superior alveolar (AMSA) and supraperiosteal injection techniques during subgingival scaling and root planing (SRP). Thirty individuals with periodontitis were scheduled for SRP on the buccal aspect of teeth in the anterior maxilla. Before SRP, on a randomly chosen side of the maxilla, the supraperiosteal injection was performed in 1 session, while the AMSA injection was conducted in the contralateral side of the same patient in another session. Immediately after each SRP session, patients rated their pain perception during the procedure with a visual analog scale. No statistically significant differences in mean pain ratings during SRP were found after both anesthetic techniques (P > .05). This preliminary study demonstrated that the AMSA and supraperiosteal injection techniques provided similar anesthetic comfort during SRP. The AMSA injection could be an alternative to anesthetize the buccal aspect of maxilla, without the undesirable effects on facial structures such as the upper lip, nostrils, and lower eyelids. However, further randomized clinical trials with larger samples are necessary to confirm such results. PMID:26650493

  1. Teaching condom use skills: practice is superior to observation.

    Science.gov (United States)

    Calsyn, Donald A; Hatch-Maillette, Mary A; Doyle, Suzanne R; Cousins, Sarah; Chen, TeChieh; Godinez, Melinda

    2010-10-01

    Men exposed to a condom skills practice exercise were hypothesized to perform better on condom skills measures than those exposed only to a demonstration or to no intervention. As part of a larger National Institute on Drug Abuse (NIDA) Clinical Trials Network HIV Prevention protocol, men in substance abuse treatment were administered male and female condom use skills measures (MCUS, FCUS) at preintervention, 2 weeks, 3 months, and 6 months postintervention. The MCUS and FCUS scores were compared for 3 intervention exposure groups (demonstration only [DO, n = 149], demonstration plus practice [D+P; n = 112], attended no sessions [NS, n = 139]) across the 4 assessment time points using a mixed effects linear regression model. There is a statistically significant intervention group-by-time effect (P < .0001) for both the MCUS and FCUS. Post hoc, pairwise linear trends across time indicated that for both the MCUS and the FCUS, the D+P group is significantly superior to the DO group and the NS group.

  2. Reproductive success of herring gulls breeding on Lake Superior

    Energy Technology Data Exchange (ETDEWEB)

    Shutt, J.L. [Canadian Wildlife Service, Hull, Quebec (Canada)

    1994-12-31

    Herring gulls breed in the vicinity of three pulp mills located on the north shore of Lake Superior. The impacts of exposure to effluents produced by these mills on various aspects of the reproductive biology of this species have been monitored since 1992. Reproductive success at these sites has been either zero or below the level necessary to maintain a stable population. Levels of dioxins and furans in the eggs and tissues of herring gulls did not show any consistent trends between the exposed and control sites and were generally low. Additionally, TCDD TEQs calculated for the same colonies, with the inclusion of several non ortho-substituted PCBs, were well below levels thought to result in reproductive impairment of herring gulls. However, plasma and liver concentrations of retinol were depressed and variable at several colonies, indicating potential diet differences between the study sites. Further determination of food types consumed at the control and exposed sites revealed that fish, the traditional diet of this species, was a small or insignificant component of the diet. Food type was also correlated with contaminant burden and reproductive output. Previously collected data as well as current results will be discussed.

  3. The mesoproterozoic midcontinent rift system, Lake Superior region, USA

    Science.gov (United States)

    Ojakangas, R.W.; Morey, G.B.; Green, J.C.

    2001-01-01

    Exposures in the Lake Superior region, and associated geophysical evidence, show that a 2000 km-long rift system developed within the North American craton ??? 1109-1087 Ma, the age span of the most of the volcanic rocks. This system is characterized by immense volumes of mafic igneous rocks, mostly subaerial plateau basalts, generated in two major pulses largely by a hot mantle plume. A new ocean basin was nearly formed before rifting ceased, perhaps due to the remote effect of the Grenville continental collision to the east. Broad sagging/subsidence, combined with a system of axial half-grabens separated along the length of the rift by accommodation zones, provided conditions for the accumulation of as much as 20 km of volcanic rocks and as much as 10 km of post-rift clastic sediments, both along the rift axis and in basins flanking a central, post-volcanic horst. Pre-rift mature, quartzose sandstones imply little or no uplift prior to the onset of rift volcanism. Early post-rift red-bed sediments consist almost entirely of intrabasinally derived volcanic sediment deposited in alluvial fan to fluvial settings; the exception is one gray to black carbon-bearing lacustrine(?) unit. This early sedimentation phase was followed by broad crustal sagging and deposition of progressively more mature red-bed, fluvial sediments with an extra-basinal provenance. ?? 2001 Elsevier Science B.V. All rights reserved.

  4. Gallbladder cancer with tumor thrombus in the superior vena cava

    Institute of Scientific and Technical Information of China (English)

    Sandeep Batra; Dinesh Chandra Doval; Ullas Batra; Pandalanghat Suresh; Amit Dhiman; Vineet Talwar

    2010-01-01

    BACKGROUND: Gastrointestinal cancers, especially pancreato-biliary cancers, are frequently associated with or are complicated by thromboembolic phenomena due to hypercoagulability and/or altered venous drainage, especially of the abdomen and lower limbs. This report describes an unusual and interesting case of gallbladder carcinoma developing a viable tumor thrombus in the superior vena cava (SVC) with resultant SVC obstruction, while on geiftinib-based anti-epidermal growth factor receptor (EGFR) therapy. METHODS: A 60-year-old woman was incidentally diagnosed to have gallbladder cancer on cholecystectomy. She had disease recurrence and received systemic chemotherapy followed by geiftinib-based anti-EGFR therapy. Subsequently, while on geiftinib-based therapy, she presented with clinical signs and symptoms suggestive of SVC thrombosis. RESULTS: A whole body PET scan revealed a metabolically active tumor thrombus in the SVC, besides other sites of metabolically active disease inclusive of the lung parenchyma, lymph nodes and abdomen. She was treated with anti-thrombotics and external beam radiotherapy directed to the SVC thrombus leading to symptomatic relief. She continues to survive on the day of writing this report. CONCLUSIONS: This rare complication, though theoretically possible, is unreported because of the short overall survival of advanced gallbladder cancer patients. This highlights that with the availability of better chemotherapeutic/biotherapeutic agents for increasing in the lifespan of cancer patients, we may come across such cases more frequently in the future.

  5. A Astronomia no Ensino Superior Brasileiro entre 1808 e 1889

    Science.gov (United States)

    Bretones, Paulo S.; Videira, Antonio A. P.

    2003-05-01

    Este artigo apresenta os principais eventos ocorridos na história do ensino de astronomia nos cursos superiores que existiram no Brasil desde a chegada da Família Real portuguesa em 1808 até o final do período monárquico. Para compor esse esboço histórico, utilizamos, principalmente, livros didáticos, regulamentos, decretos e leis responsáveis pelas organizações dos conteúdos oferecidos e das carreiras dos responsáveis pela disciplina. Na análise do material empregado, investigamos a presença de concepções filosóficas e científicas, que podem ter norteado os conteúdos disciplinares. Não realizamos nenhuma comparação com o ensino de astronomia em outros países. Concluímos mostrando que o estudo de astronomia, durante o período monárquico, foi mais direcionado para a formação d engenheiros do que astrônomos. Gostaríamos de observar que o presente artigo não tem a pretensão de abordar o assunto de maneira completa e detalhada.

  6. Modeling the value of strategic actions in the superior colliculus

    Directory of Open Access Journals (Sweden)

    Dhushan Thevarajah

    2010-02-01

    Full Text Available In learning models of strategic game play, an agent constructs a valuation (action value over possible future choices as a function of past actions and rewards. Choices are then stochastic functions of these action values. Our goal is to uncover a neural signal that correlates with the action value posited by behavioral learning models. We measured activity from neurons in the superior colliculus (SC, a midbrain region involved in planning saccadic eye movements, in monkeys while they performed two saccade tasks. In the strategic task, monkeys competed against a computer in a saccade version of the mixed-strategy game “matching-pennies”. In the instructed task, stochastic saccades were elicited through explicit instruction rather than free choices. In both tasks, neuronal activity and behavior were shaped by past actions and rewards with more recent events exerting a larger influence. Further, SC activity predicted upcoming choices during the strategic task and upcoming reaction times during the instructed task. Finally, we found that neuronal activity in both tasks correlated with an established learning model, the Experience Weighted Attraction model of action valuation (Ho, Camerer, and Chong, 2007. Collectively, our results provide evidence that action values hypothesized by learning models are represented in the motor planning regions of the brain in a manner that could be used to select strategic actions.

  7. Bone Scan "Hot Spot" at the Superior Lateral Orbital Margin Fronto-zygomatic Suture Uptake Characterized with Tc-99m MDP SPECT/CT.

    Science.gov (United States)

    Thang, S P; Tan, A E H; Goh, A S W

    2011-07-01

    Findings of a solitary "hot spot" at the superior lateral orbital margin on bone scan scintigraphy is not uncommonly seen, and is often dismissed as a benign lesion. However, the exact etiology is indeterminate. We present two cases in which hybrid single photon emission computed tomography/computed tomography imaging was able to characterize and localize this uptake, demonstrating correlation to the right fronto-zygomatic suture.

  8. Molecular imaging with terahertz waves.

    Science.gov (United States)

    Oh, Seung Jae; Choi, Jihye; Maeng, Inhee; Park, Jae Yeon; Lee, Kwangyeol; Huh, Yong-Min; Suh, Jin-Suck; Haam, Seungjoo; Son, Joo-Hiuk

    2011-02-28

    We demonstrate a highly sensitive THz molecular imaging (TMI) technique involving differential modulation of surface plasmons induced on nanoparticles and obtain target specific in vivo images of cancers. This technique can detect quantities of gold nanoparticles as small as 15 µM in vivo. A comparison of TMI images with near infrared absorption images shows the superior sensitivity of TMI. Furthermore, the quantification property of TMI is excellent, being linearly proportional to the concentration of nanoparticles. The target specificity issue is also addressed at the ex vivo and cell levels. The high thermal sensitivity of TMI can help extend photonic-based photothermal molecular imaging researches from the in vitro level to the in vivo level. The TMI technique can be used for monitoring drug delivery processes and for early cancer diagnosis.

  9. Responses in the right posterior superior temporal sulcus show a feature-based response to facial expression.

    Science.gov (United States)

    Flack, Tessa R; Andrews, Timothy J; Hymers, Mark; Al-Mosaiwi, Mohammed; Marsden, Samuel P; Strachan, James W A; Trakulpipat, Chayanit; Wang, Liang; Wu, Tian; Young, Andrew W

    2015-08-01

    The face-selective region of the right posterior superior temporal sulcus (pSTS) plays an important role in analysing facial expressions. However, it is less clear how facial expressions are represented in this region. In this study, we used the face composite effect to explore whether the pSTS contains a holistic or feature-based representation of facial expression. Aligned and misaligned composite images were created from the top and bottom halves of faces posing different expressions. In Experiment 1, participants performed a behavioural matching task in which they judged whether the top half of two images was the same or different. The ability to discriminate the top half of the face was affected by changes in the bottom half of the face when the images were aligned, but not when they were misaligned. This shows a holistic behavioural response to expression. In Experiment 2, we used fMR-adaptation to ask whether the pSTS has a corresponding holistic neural representation of expression. Aligned or misaligned images were presented in blocks that involved repeating the same image or in which the top or bottom half of the images changed. Increased neural responses were found in the right pSTS regardless of whether the change occurred in the top or bottom of the image, showing that changes in expression were detected across all parts of the face. However, in contrast to the behavioural data, the pattern did not differ between aligned and misaligned stimuli. This suggests that the pSTS does not encode facial expressions holistically. In contrast to the pSTS, a holistic pattern of response to facial expression was found in the right inferior frontal gyrus (IFG). Together, these results suggest that pSTS reflects an early stage in the processing of facial expression in which facial features are represented independently.

  10. Trauma to the Superior Mesenteric Artery and Superior Mesenteric Vein: A Narrative Review of Rare but Lethal Injuries.

    Science.gov (United States)

    Phillips, B; Reiter, S; Murray, E P; McDonald, D; Turco, L; Cornell, D L; Asensio, J A

    2017-09-05

    Mesenteric vessels, including the superior mesenteric artery (SMA) and vein (SMV), provide and drain the rich blood supply of the midgut and hindgut. SMA and SMV injuries are rare and often lethal. Clinical management of these injuries is not well established, but treatment options include operative, non-operative, and endovascular strategies. A narrative review of the literature was conducted using MEDLINE Complete-EBSCO. Relevant studies, specifically those focusing on diagnosis and management of SMA and SMV injuries, were selected. Only original reports and collected series were selected to prevent duplication of cases. A search of the literature for mesenteric arterial injuries yielded 87 studies. Vessel-specific breakdown of the studies yielded 40 with SMA injuries and 41 with SMV injuries. These searches were winnowed to 26 individual studies, which were included in this collective review. Limitations of this study are similar to all narrative literature reviews: the dependence on previously published research and availability of references as outlined in our methodology. Although historically rare, mesenteric vessel injuries are seen with increasing incidence and continue to present a challenge to trauma surgeons due to their daunting mortality rates. Currently, universal treatment guidelines do not exist, but the various options for their management have been extensively reviewed in the literature.

  11. Age and growth of the whitefish in Lake Superior

    Science.gov (United States)

    Dryer, William R.

    1963-01-01

    The average annual commercial production of whitefish in the U.S. waters of Lake Superior dropped from 2,194,000 pounds in 1879-1908 to 504,000 pounds in 1911-59. The modern production, though far below the earlier, has accounted for more than 10 percent of the total value of the fishery in all but one of the last 20 years. Data are given on growth rate, age and year-class composition, size distribution, and length-weight relation of 1,800 fish collected in 1957-59 at Bayfield, Wis., and Marquette, Whitefish Point, and Dollar Settlement, Mich. Studies of the body-scale relation, sex ratio, and age and size at maturity were limited to fish collected at Bayfield. The age composition and mean age varied widely by port and year of capture. Oldest fish were those of the 1957 Bayfield samples which were dominated by age group VII and averaged 5.5 years old. The youngest were from Whitefish Point in 1959; age-group III was dominant, and the mean age was 3.2 years. The evidence on the strength of year classes was not clear-cut, but it was obvious that fluctuations in stocks of different areas were largely independent. The percentage of legal-size fish (17 inches or longer) in age groups ranged widely; only 8.6 percent of the V group were legal in the 1957 Bayfield collections, whereas 100 percent of fish of the same age were legal in the 1957-59 collections from Whitefish Point. The weight of whitefish in the combined samples increased as the 3.2408 power of the length. The growth rate from the fastest to the slowest growing stocks ranked as follows: Whitefish Point; Dollar Settlement and Marquette (fish from the two ports reversed ranks after 3 years); Bayfield. The major differences in growth in length among the various stocks occurred during the first years of life. Beyond the fifth year the annual increments were nearly the same in all stocks. The whitefish from Whitefish Point, Dollar Settlement, and Marquette are among the fastest growing in the Great Lakes. The

  12. Body Image

    Science.gov (United States)

    ... About Us Contact Us Text size | Print | Body Image Developing a positive body image and a healthy mental attitude is crucial to ... on for tips to have a healthy body image. Topics About body image When you look in ...

  13. The role of the superior laryngeal nerve in esophageal reflexes.

    Science.gov (United States)

    Lang, I M; Medda, B K; Jadcherla, S; Shaker, R

    2012-06-15

    The aim of this study was to determine the role of the superior laryngeal nerve (SLN) in the following esophageal reflexes: esophago-upper esophageal sphincter (UES) contractile reflex (EUCR), esophago-lower esophageal sphincter (LES) relaxation reflex (ELIR), secondary peristalsis, pharyngeal swallowing, and belch. Cats (N = 43) were decerebrated and instrumented to record EMG of the cricopharyngeus, thyrohyoideus, geniohyoideus, and cricothyroideus; esophageal pressure; and motility of LES. Reflexes were activated by stimulation of the esophagus via slow balloon or rapid air distension at 1 to 16 cm distal to the UES. Slow balloon distension consistently activated EUCR and ELIR from all areas of the esophagus, but the distal esophagus was more sensitive than the proximal esophagus. Transection of SLN or proximal recurrent laryngeal nerves (RLN) blocked EUCR and ELIR generated from the cervical esophagus. Distal RLN transection blocked EUCR from the distal cervical esophagus. Slow distension of all areas of the esophagus except the most proximal few centimeters activated secondary peristalsis, and SLN transection had no effect on secondary peristalsis. Slow distension of all areas of the esophagus inconsistently activated pharyngeal swallows, and SLN transection blocked generation of pharyngeal swallows from all levels of the esophagus. Slow distension of the esophagus inconsistently activated belching, but rapid air distension consistently activated belching from all areas of the esophagus. SLN transection did not block initiation of belch but blocked one aspect of belch, i.e., inhibition of cricopharyngeus EMG. Vagotomy blocked all aspects of belch generated from all areas of esophagus and blocked all responses of all reflexes not blocked by SLN or RLN transection. In conclusion, the SLN mediates all aspects of the pharyngeal swallow, no portion of the secondary peristalsis, and the EUCR and ELIR generated from the proximal esophagus. Considering that SLN is not

  14. O ENSINO SUPERIOR EM TURISMO: HUMANO OU MERCADO?

    Directory of Open Access Journals (Sweden)

    Waléria Thabata Roldão Niquini

    2013-06-01

    Full Text Available Desde La creación de la educación superior en el Turismo en Brasil, en La década de 1970, se han producido algunas discusiones en relación a la formación del estudiante y su desempeño en el mercado laboral. Sin embargo hay varios puntos educativos significantes incluso antes de la aparición de la inserción profesional. La preparación de los estudiantes, las acciones de los maestros en la esfera de investigación y extensión y la necesidad del pensamiento crítico son supuestos que poden justificar tal curso mientras que la práctica educativa libertadora. Estas son las cuestiones discutidas en esta investigación destinada a comprender las perspectivas docente y dicente, en la licenciatura en Turismo, sobre la relación entre la enseñanza y el aprendizaje y sus aspectos esenciales, en una más amplia visión y menos fragmentada, entre la destacada dicotomía y el mercado de laboro y el pensamiento crítico científico. Se concluye que el debate académico sobre la educación en el Turismo todavía se disocia sólo entre los intereses del mercado y las discusiones humanas, sin una integración profunda en la relación enseñanza-aprendizaje.

  15. Surgical treatment of superior oblique palsy: Predictors of outcome

    Directory of Open Access Journals (Sweden)

    Pilar Merino Sanz

    2017-01-01

    Full Text Available Purpose: The purpose of this study was to evaluate the incidence and outcome of surgically treated superior oblique palsy (SOP and the factors involved in its resolution. Methods: We performed a retrospective study of 76 patients who underwent surgery for SOP. We recorded data from the physical examination and the number and type of procedures performed. Favorable outcome was defined as resolution of or improvement in torticollis (≤5° and diplopia in primary position (PP and downgaze or as vertical deviation (VD <5 prism diopters (pd in PP and 10 pd in the oblique diagnostic position. Results: Mean age was 33.12 years. Congenital SOP was the most frequent type (65.8%. Mean preoperative VD was 15.89 ± 9.94 pd, decreasing to 3.07 ± 4.36 pd after surgery. Associated horizontal deviation was recorded in 51.32% of cases. The mean number of procedures was 1.37 ± 0.62 (range 1–4, with 69.7% of patients requiring only one procedure. The mean number of muscles operated on was 1.96 ± 1.01 (inferior oblique being the most frequent. A greater reduction in VD after surgery was observed in patients with congenital SOP (P = 0.04. Although none of the factors evaluated influenced surgical outcome, amblyopic patients had a greater risk of reoperation (P = 0.04. A favorable outcome was achieved in 75% of cases. Mean follow-up was 37.08 months. Conclusion: Congenital SOP was twice as frequent as acquired SOP and although surgery was successful in most cases, a greater reduction in VD was obtained in congenital cases. Amblyopia was identified as a risk factor for reoperation.

  16. Robot-assisted partial nephrectomy: Superiority over laparoscopic partial nephrectomy.

    Science.gov (United States)

    Shiroki, Ryoichi; Fukami, Naohiko; Fukaya, Kosuke; Kusaka, Mamoru; Natsume, Takahiro; Ichihara, Takashi; Toyama, Hiroshi

    2016-02-01

    Nephron-sparing surgery has been proven to positively impact the postoperative quality of life for the treatment of small renal tumors, possibly leading to functional improvements. Laparoscopic partial nephrectomy is still one of the most demanding procedures in urological surgery. Laparoscopic partial nephrectomy sometimes results in extended warm ischemic time and severe complications, such as open conversion, postoperative hemorrhage and urine leakage. Robot-assisted partial nephrectomy exploits the advantages offered by the da Vinci Surgical System to laparoscopic partial nephrectomy, equipped with 3-D vision and a better degree in the freedom of surgical instruments. The introduction of the da Vinci Surgical System made nephron-sparing surgery, specifically robot-assisted partial nephrectomy, safe with promising results, leading to the shortening of warm ischemic time and a reduction in perioperative complications. Even for complex and challenging tumors, robotic assistance is expected to provide the benefit of minimally-invasive surgery with safe and satisfactory renal function. Warm ischemic time is the modifiable factor during robot-assisted partial nephrectomy to affect postoperative kidney function. We analyzed the predictive factors for extended warm ischemic time from our robot-assisted partial nephrectomy series. The surface area of the tumor attached to the kidney parenchyma was shown to significantly affect the extended warm ischemic time during robot-assisted partial nephrectomy. In cases with tumor-attached surface area more than 15 cm(2) , we should consider switching robot-assisted partial nephrectomy to open partial nephrectomy under cold ischemia if it is imperative. In Japan, a nationwide prospective study has been carried out to show the superiority of robot-assisted partial nephrectomy to laparoscopic partial nephrectomy in improving warm ischemic time and complications. By facilitating robotic technology, robot-assisted partial nephrectomy

  17. Non-Stationarity in Multisensory Neurons in the Superior Colliculus

    Directory of Open Access Journals (Sweden)

    Thomas J Perrault

    2011-07-01

    Full Text Available The superior colliculus (SC integrates information from multiple sensory modalities to facilitate the detection and localization of salient events. The efficacy of multisensory integration is traditionally measured by comparing the magnitude of the response elicited by a cross-modal stimulus to the responses elicited by its modality-specific component stimuli, and because there is an element of randomness in the system, these calculations are made using response values averaged over multiple stimulus presentations in an experiment. Recent evidence suggests that multisensory integration in the SC is highly plastic and these neurons adapt to specific anomalous stimulus configurations. This raises the question whether such adaptation occurs during an experiment with traditional stimulus configurations; that is, whether the state of the neuron and its integrative principles are the same at the beginning and end of the experiment, or whether they are altered as a consequence of exposure to the testing stimuli even when they are pseudo-randomly interleaved. We find that unisensory and multisensory responses do change during an experiment, and these changes are predictable. Responses that are initially weak tend to potentiate, responses that are initially strong tend to habituate, and the efficacy of multisensory integration waxes or wanes accordingly during the experiment as predicted by the principle of inverse effectiveness. These changes are presumed to reflect two competing mechanisms in the SC: potentiation reflecting increases in the expectation that a stimulus will occur at a given location, habituation reflecting decreases in stimulus novelty. These findings indicate plasticity in multisensory integration that allows animals to adapt to rapidly changing environmental events while suggesting important caveats in the interpretation of experimental data: the neuron studied at the beginning of an experiment is not the same at the end of it.

  18. Cambiar paradigmas: una experiencia en educación superior

    Directory of Open Access Journals (Sweden)

    Gisella Vargas Chinchilla

    2004-09-01

    Full Text Available

    Resumen. Una experiencia en educación superior, al estilo de investigación-acción, donde una “comunidad de aprendizaje” constituida por docentes y estudiantes, busca convertirse en entes multiplicadores del desarrollo sostenible, dentro del plan de formación de docentes de Educación Preescolar.

    Esta investigación constituye el Trabajo final de Graduación, requisito de un grupo de estudiantes para obtener el grado de Licenciadas en Educación Preescolar, en la Universidad de Costa Rica. El proceso metodológico dio inicio con un diagnóstico, para seguir con un plan de acción, organizado y desarrollado en conjunto, estudiantes y docentes, para culminar con la aceptación de “compromisos ambientales” asumidos por las personas participantes.

     

    Abstract. This is a research-action type of experience in higher education lived by a “learning community” conformed by teachers and students whose aim is to become fostering agents for sustainable development. The experience was carried out as part of the plan for teacher training in Preschool Education.

    This paper is the authors' Final Graduation Paper, a requirement to obtain a Licentiate degree in Preschool Education at the University of Costa Rica. The research began with a diagnosis that would lead to the implementation of an action plan that was organized and carried out jointly by the students and their teachers. The project finished with the participants' acceptance of some “environmental commitments”.

  19. Spatiotemporal structure of visual receptive fields in macaque superior colliculus.

    Science.gov (United States)

    Churan, Jan; Guitton, Daniel; Pack, Christopher C

    2012-11-01

    Saccades are useful for directing the high-acuity fovea to visual targets that are of behavioral relevance. The selection of visual targets for eye movements involves the superior colliculus (SC), where many neurons respond to visual stimuli. Many of these neurons are also activated before and during saccades of specific directions and amplitudes. Although the role of the SC in controlling eye movements has been thoroughly examined, far less is known about the nature of the visual responses in this area. We have, therefore, recorded from neurons in the intermediate layers of the macaque SC, while using a sparse-noise mapping procedure to obtain a detailed characterization of the spatiotemporal structure of visual receptive fields. We find that SC responses to flashed visual stimuli start roughly 50 ms after the onset of the stimulus and last for on average ~70 ms. About 50% of these neurons are strongly suppressed by visual stimuli flashed at certain locations flanking the excitatory center, and the spatiotemporal pattern of suppression exerts a predictable influence on the timing of saccades. This suppression may, therefore, contribute to the filtering of distractor stimuli during target selection. We also find that saccades affect the processing of visual stimuli by SC neurons in a manner that is quite similar to the saccadic suppression and postsaccadic enhancement that has been observed in the cortex and in perception. However, in contrast to what has been observed in the cortex, decreased visual sensitivity was generally associated with increased firing rates, while increased sensitivity was associated with decreased firing rates. Overall, these results suggest that the processing of visual stimuli by SC receptive fields can influence oculomotor behavior and that oculomotor signals originating in the SC can shape perisaccadic visual perception.

  20. Experiencing the changing climate on the shores of Lake Superior

    Science.gov (United States)

    Akerlof, K.; Maibach, E.

    2011-12-01

    The Great Lakes of the United States - the largest freshwater system in the world - have been termed "the canary in the coal mine" of environmental change. To assess if and how residents of Alger County, Michigan are experiencing changes in climate on the shores of Lake Superior, during the summer of 2010 we conducted a representative household mail survey in collaboration with a national lakeshore and watershed partnership. A total of 765 adult residents (18 years or older) responded to the survey; a 57% survey completion rate. We content analyzed respondents' open-ended characterizations of how they have personally experienced global warming, and compared the results with land surface and storm data for the same geographic region to see whether public perceptions of local changes match trends in National Climatic Data Center data. Just over a quarter of residents (27%) indicated that they had personally experienced global warming. Those who had were most likely to say that they had experienced global warming locally (as opposed to in other locations of the country or globally), and most frequently cited changes in seasons, weather, lake levels, and animals or plant species. However, some local public perceptions appeared to conflict with weather records. For example, residents were more likely to say that they had been experiencing less snow in the winters, while NCDC data suggests the reverse is true. As climate changes differentially in regions across the United States, the public will in turn experience its physical impacts in distinct ways that are unique to each landscape. This may be counter-intuitive to a public that increasingly experiences the world, and issues such as climate change, through sources of information such as national news media that operate at much larger geographic scales. Understanding where these forms of cognitive dissonance may arise may assist researchers, educators, and communicators in furthering discourses with the public about

  1. [Acupoint catgut-embedding therapy: superiorities and principles of application].

    Science.gov (United States)

    Zhang, Xuan-Ping; Jia, Chun-Sheng; Wang, Jian-Ling; Shi, Jing; Zhang, Xin; Li, Xiao-Feng; Xu, Xiao-Kang; Qin, Liang; Zhang, Mei-Ling; Kang, Su-Gang; Duan, Xiao-Dong

    2012-10-01

    To analyze the superiorities of acupoint catgut-embedding therapy, discuss its law of clinical application and provide scientific decision-making for clinical treatment. Literatures on acupoint catgut-embedding therapy in the recent 40 years were selected, input, examined and verified, picked up and analyzed by establishing database with the modern computer technology. (1) One thousand and seventy-five literatures were input. It shows that the acupoint catgut-embedding therapy has an extensive application in all departments, especially in the internal department, accounting for 48.54% (50/103) of the total disease category. It has the most extensive application on treatment of epigastric pain, with the frequency of 102 times, and obesity of 74 times. The next is surgery, accounting for 14.56% (15/103). The major application is on low back pain and leg pain with the frequency of 79 times. Psoriasis, with the frequency of 30 times, holds the major application in dermatological department. And blepharoplasty, with the frequency of 30 times, gains the most application in department of ophthalmology and otorhinolaryngology. (2) In the included literatures, selection of adjacent acupoints and distal acupoints are held as the major method of acupoint selection. The adjusted lumbar puncture needle is taken as the major tool for the acupoint catgut-embedding therapy. And catguts of different sizes are adopted for the operation. (3) Analysis of the therapeutic effect shows that acupoint catgut-embedding therapy has obvious effect in all departments, especially in surgery and dermatology, with the total effective rate over 90%. Epigastric pain, obesity, epilepsy, asthma, abdominal pain, facial paralysis and constipation of the internal medicine, low back pain and leg pain of the surgical department, psoriasis of the dermatological department and blepharoplasty of the department of ophthalmology and otorhinolaryngology are considered as the dominant diseases for acupoint

  2. Percutaneous treatment of superior vena cava syndrome using metallic stents

    Energy Technology Data Exchange (ETDEWEB)

    De Gregorio Ariza, Miguel Angel; Gimeno, Maria Jose; Alfonso, Eduardo; Mainar, Antonio; Medrano, Joaquin; Lopez-Marin, Paloma [Department of Interventional Radiology, ' ' Lozano Blesa' ' University Hospital, Avda. San Juan Bosco 15, 50009 Zaragoza (Spain); Gamboa, Pablo [Division of Interventional Radiology, Ohio State University Hospital, Columbus, Ohio (United States); Tobio, Ricardo [Interventional Radiology, Clinica de la Zarzuela, Madrid (Spain); Herrera, Marcos [Division of Interventional Radiology, University of Minnesota, Minneapolis, Minnesota (United States)

    2003-04-01

    The purpose of this study was to evaluate the results of treatment of superior vena cava syndrome (SVCS) in patients with benign and malignant disease using expandable metallic stent. From January 1995 to April 2000, 87 expandable stents were implanted in 82 patients (59 men, 23 women; mean age 57.8 years, age range 39-79 years) for the treatment of SVCS. The SVCS was defined as symptomatic bilateral obstruction of venous drainage from head, neck and upper extremities. In 68 patients SVCS was due to malignant neoplasia, and in 14 cases it was due to benign aetiology. All patients were treated with expandable stent. We implanted 81 Wallstent prostheses and 6 Palmaz stents. Adjuvant thrombolysis was applied in 12 patients who required fibrinolysis. After recanalization, the stent was implanted in all cases in SVC (infra- or supra-azygos vein). All patients were treated with heparin of low molecular weight (HBPM) during 6 months. Patency was analyzed according to clinical symptoms and Doppler US or venograms exploration. Technical success was observed in all cases. Clinical success was reached in 78 of 82 patients (95.1%) (absence of symptoms in 2 or 3 days). Four patients suffered immediate thrombosis which required fibrinolitic treatment with a new prosthesis placement in 1 case. The follow-up for the malignant process was of 7.1 months (range 1-39 months) and in benign cases was 31.2 months (range 11-61 months). Sixty-two (91.1%) patients with malignancy died without SVCS symptomatology. All the patients with benign pathology are alive. Clinical primary patency in malignant cases was 87% with assisted patency of 96.2%. Endovascular therapy using metallic stent and thrombolysis is a successful method to treat SVCS due to benign or malignant aetiology. (orig.)

  3. Superior mesenteric artery outcomes after fenestrated endovascular aortic aneurysm repair.

    Science.gov (United States)

    Lala, Salim; Knowles, Martyn; Timaran, David; Baig, Mirza Shadman; Valentine, James; Timaran, Carlos

    2016-09-01

    The Zenith (Cook Medical, Bloomington, Ind) fenestrated endovascular graft may be designed with single-wide scallops or large fenestrations to address the superior mesenteric artery (SMA). Misalignment of the SMA with an unstented scallop or a large fenestration is possible. This study assessed SMA outcomes after fenestrated endovascular aortic aneurysm repair (FEVAR). During an 18-month period, 47 FEVARs were performed at a single institution. For analysis, patients were grouped according to unstented (n = 23) vs stented (n = 24) SMA scallops/fenestrations. The Institutional Review Board approved this single-institution observational study. Because this was a retrospective review of the data, patient consent was unnecessary for the study. Technical success for FEVAR was 100%. The median follow-up period was 7.7 months (range, 1-16 months). Nine of 21 patients (43%) in the unstented group had some degree of misalignment of the SMA (range, 9%-71%). Among these, four patients (44%) developed complications: three SMA stenoses and one occlusion. The mean peak systolic velocity in patients with and without SMA misalignment was 317.8 cm/s vs 188.4 cm/s (P < .08), respectively. No misalignment occurred in the stented group, and only one of 19 patients (5%) developed an SMA stenosis that required angioplasty. Overall, patients with unstented SMAs had significantly more adverse events directly attributable to SMA misalignment than the stented group (44% vs 5%, respectively; P < .05). Misalignment of the SMA with the use of unstented unreinforced scallops or fenestrations occurs frequently. Routine stenting of single-wide and large fenestrations, when feasible, may be a safer option for patients undergoing FEVAR. Copyright © 2016 Society for Vascular Surgery. Published by Elsevier Inc. All rights reserved.

  4. A surgical view of the superior nasal turbinate: anatomical study.

    Science.gov (United States)

    Orhan, Mustafa; Govsa, Figen; Saylam, Canan

    2010-06-01

    Differences of the superior nasal turbinate (SNT), presence of the supreme nasal turbinate (SpNT) and measurements of opening sphenoid sinus (OSS) are consistent anatomical landmarks that allow for safe entrances, such as posterior ethmoidectomy and sphenoid sinusotomy. The purpose of study was to investigate the anatomical details of the SNT for approaching the OSS on 20 specimens of adult cadavers under an operating microscope. The SNT and SpNT were localized more perpendicular than parallel to their axes. The SpNT structure was observed in 12 specimens (60%) and it was classified into three types. Type A SpNT was shortest of all turbinates (58.3%). In types B and C, SpNT was equal or larger than the SNT. These types were seen in 41.7% of specimens. In 11 specimens, posterior ethmoidal cells opened to supreme nasal meatus. In 7 specimens, there was one opening to supreme nasal meatus, while 2 openings were detected in 12 specimens, and 3 openings were seen in 1 specimen. All these openings belonged to posterior ethmoidal cells. To determine the position of the OSS, distances between some anatomical points were measured. In cases where the SpNT is present or the SpNT is bigger than the SNT, it is certain that a different method will be applied during the procedure in the nasal cavity. The SNT and the SpNT may easily be injured by unrecognized dissection in types B and C, leading to the disruption of its olfactory neuroepithelium and possibly to postoperative hyposmia.

  5. Surgical treatment of superior laryngeal neuralgia: A case report and review of the literature.

    Science.gov (United States)

    Salzman, Richard; Gabrhelík, Tomáš; Stárek, Ivo

    2016-03-01

    Superior laryngeal (SL) neuralgia is paroxysmal pain above the thyrohyoid membrane. We present a case of SL neuralgia that was resistant to conservative treatment and eventually required surgical intervention. The patient was a 39-year-old woman with a 5-year history of debilitating pain above the thyroid cartilage. After having undergone different imaging scans with negative results, she tried various treatments (e.g., antibiotics, analgesics, stellate ganglion block, radiofrequency SL neurotomy, and stereotactic radiosurgery), all of which were ineffective. Finally, she underwent bilateral surgical SL neurotomy. Postoperatively, she immediately noticed a significant alleviation of her pain. Her postoperative course was completely uneventful, as she experienced no dysphagia or dysphonia, even transiently. One month later, she no longer required regular painkillers, and at 14 months, she remained essentially pain-free. While medical management remains the treatment of choice for SL neuralgia, we recommend that refractory cases be treated initially with a neural block with local anesthesia. Patients who do not respond are candidates for surgery. We consider selective peripheral SL neurotomy to be safe and effective when performed by experienced hands. We also discuss the difficulties of managing SL neuralgia.

  6. Spectral organization of the human lateral superior temporal gyrus revealed by intracranial recordings.

    Science.gov (United States)

    Nourski, Kirill V; Steinschneider, Mitchell; Oya, Hiroyuki; Kawasaki, Hiroto; Jones, Robert D; Howard, Matthew A

    2014-02-01

    The place of the posterolateral superior temporal (PLST) gyrus within the hierarchical organization of the human auditory cortex is unknown. Understanding how PLST processes spectral information is imperative for its functional characterization. Pure-tone stimuli were presented to subjects undergoing invasive monitoring for refractory epilepsy. Recordings were made using high-density subdural grid electrodes. Pure tones elicited robust high gamma event-related band power responses along a portion of PLST adjacent to the transverse temporal sulcus (TTS). Responses were frequency selective, though typically broadly tuned. In several subjects, mirror-image response patterns around a low-frequency center were observed, but typically, more complex and distributed patterns were seen. Frequency selectivity was greatest early in the response. Classification analysis using a sparse logistic regression algorithm yielded above-chance accuracy in all subjects. Classifier performance typically peaked at 100-150 ms after stimulus onset, was comparable for the left and right hemisphere cases, and was stable across stimulus intensities. Results demonstrate that representations of spectral information within PLST are temporally dynamic and contain sufficient information for accurate discrimination of tone frequencies. PLST adjacent to the TTS appears to be an early stage in the hierarchy of cortical auditory processing. Pure-tone response patterns may aid auditory field identification.

  7. Representation of Glossy Material Surface in Ventral Superior Temporal Sulcal Area of Common Marmosets.

    Science.gov (United States)

    Miyakawa, Naohisa; Banno, Taku; Abe, Hiroshi; Tani, Toshiki; Suzuki, Wataru; Ichinohe, Noritaka

    2017-01-01

    The common marmoset (Callithrix jacchus) is one of the smallest species of primates, with high visual recognition abilities that allow them to judge the identity and quality of food and objects in their environment. To address the cortical processing of visual information related to material surface features in marmosets, we presented a set of stimuli that have identical three-dimensional shapes (bone, torus or amorphous) but different material appearances (ceramic, glass, fur, leather, metal, stone, wood, or matte) to anesthetized marmoset, and recorded multiunit activities from an area ventral to the superior temporal sulcus (STS) using multi-shanked, and depth resolved multi-electrode array. Out of 143 visually responsive multiunits recorded from four animals, 29% had significant main effect only of the material, 3% only of the shape and 43% of both the material and the shape. Furthermore, we found neuronal cluster(s), in which most cells: (1) showed a significant main effect in material appearance; (2) the best stimulus was a glossy material (glass or metal); and (3) had reduced response to the pixel-shuffled version of the glossy material images. The location of the gloss-selective area was in agreement with previous macaque studies, showing activation in the ventral bank of STS. Our results suggest that perception of gloss is an important ability preserved across wide range of primate species.

  8. How music alters a kiss: superior temporal gyrus controls fusiform–amygdalar effective connectivity

    Science.gov (United States)

    Deserno, Lorenz; Bakels, Jan-Hendrik; Schlochtermeier, Lorna H.; Kappelhoff, Hermann; Jacobs, Arthur M.; Fritz, Thomas Hans; Koelsch, Stefan; Kuchinke, Lars

    2014-01-01

    While watching movies, the brain integrates the visual information and the musical soundtrack into a coherent percept. Multisensory integration can lead to emotion elicitation on which soundtrack valences may have a modulatory impact. Here, dynamic kissing scenes from romantic comedies were presented to 22 participants (13 females) during functional magnetic resonance imaging scanning. The kissing scenes were either accompanied by happy music, sad music or no music. Evidence from cross-modal studies motivated a predefined three-region network for multisensory integration of emotion, consisting of fusiform gyrus (FG), amygdala (AMY) and anterior superior temporal gyrus (aSTG). The interactions in this network were investigated using dynamic causal models of effective connectivity. This revealed bilinear modulations by happy and sad music with suppression effects on the connectivity from FG and AMY to aSTG. Non-linear dynamic causal modeling showed a suppressive gating effect of aSTG on fusiform–amygdalar connectivity. In conclusion, fusiform to amygdala coupling strength is modulated via feedback through aSTG as region for multisensory integration of emotional material. This mechanism was emotion-specific and more pronounced for sad music. Therefore, soundtrack valences may modulate emotion elicitation in movies by differentially changing preprocessed visual information to the amygdala. PMID:24298171

  9. Involvement of the dorsolateral prefrontal cortex and superior temporal sulcus in impaired social perception in schizophrenia.

    Science.gov (United States)

    Shin, Jung Eun; Choi, Soo-Hee; Lee, Hyeongrae; Shin, Young Seok; Jang, Dong-Pyo; Kim, Jae-Jin

    2015-04-03

    Schizophrenia is a mental disorder characterized by impairments in diverse thinking and emotional responses, which are related to social perception dysfunction. This fMRI study was designed to investigate a neurobiological basis of social perception deficits of patients with schizophrenia in various social situations of daily life and their relationship with clinical symptoms and social dysfunction. Seventeen patients and 19 controls underwent functional magnetic resonance imaging, during which participants performed a virtual social perception task, containing an avatar's speech with positive, negative or neutral emotion in a virtual reality space. Participants were asked to determine whether or not the avatar's speech was appropriate to each situation. The significant group×appropriateness interaction was seen in the left dorsolateral prefrontal cortex (DLPFC), resulting from lower activity in patients in the inappropriate condition, and left DLPFC activity was negatively correlated with the severity of negative symptoms and positively correlated with the level of social functioning. The significant appropriateness×emotion interaction observed in the left superior temporal sulcus (STS) was present in controls, but absent in patients, resulting from the existence and absence of a difference between the inappropriate positive and negative conditions, respectively. These findings indicate that dysfunction of the DLPFC-STS network may underlie patients' abnormal social perception in various social situations of daily life. Abnormal functioning of this network may contribute to increases of negative symptoms and decreases of social functioning. Copyright © 2014 Elsevier Inc. All rights reserved.

  10. How music alters a kiss: superior temporal gyrus controls fusiform-amygdalar effective connectivity.

    Science.gov (United States)

    Pehrs, Corinna; Deserno, Lorenz; Bakels, Jan-Hendrik; Schlochtermeier, Lorna H; Kappelhoff, Hermann; Jacobs, Arthur M; Fritz, Thomas Hans; Koelsch, Stefan; Kuchinke, Lars

    2014-11-01

    While watching movies, the brain integrates the visual information and the musical soundtrack into a coherent percept. Multisensory integration can lead to emotion elicitation on which soundtrack valences may have a modulatory impact. Here, dynamic kissing scenes from romantic comedies were presented to 22 participants (13 females) during functional magnetic resonance imaging scanning. The kissing scenes were either accompanied by happy music, sad music or no music. Evidence from cross-modal studies motivated a predefined three-region network for multisensory integration of emotion, consisting of fusiform gyrus (FG), amygdala (AMY) and anterior superior temporal gyrus (aSTG). The interactions in this network were investigated using dynamic causal models of effective connectivity. This revealed bilinear modulations by happy and sad music with suppression effects on the connectivity from FG and AMY to aSTG. Non-linear dynamic causal modeling showed a suppressive gating effect of aSTG on fusiform-amygdalar connectivity. In conclusion, fusiform to amygdala coupling strength is modulated via feedback through aSTG as region for multisensory integration of emotional material. This mechanism was emotion-specific and more pronounced for sad music. Therefore, soundtrack valences may modulate emotion elicitation in movies by differentially changing preprocessed visual information to the amygdala.

  11. Changes in Effective Connectivity of the Superior Parietal Lobe during Inhibition and Redirection of Eye Movements

    Science.gov (United States)

    Asscheman, Susanne J.; Thakkar, Katharine N.; Neggers, Sebastiaan F.W.

    2015-01-01

    Executive control is the ability to flexibly control behavior and is frequently studied with saccadic eye movements. Contrary to frontal oculomotor areas, the role of the superior parietal lobe (SPL) in the executive control of saccades remains unknown. To explore the role of SPL networks in saccade control, we performed a saccadic search-step task while acquiring functional magnetic resonance imaging data for 41 participants. Psychophysiological interaction analyses assessed task-related differences in the effective connectivity of SPL with other brain regions during the inhibition and redirection of saccades. Results indicate an increased coupling of SPL with frontal, posterior, and striatal oculomotor areas for redirected saccades versus visually guided saccades. Saccade inhibition versus unsuccessful inhibition revealed an increased coupling of SPL with dorsolateral prefrontal cortex and anterior cingulate cortex. We discuss how these findings relate to ongoing debates about the implementation of executive control and conclude that early attentional control and rapid updating of saccade goals are important signals for executive control. PMID:27147827

  12. Representation of Glossy Material Surface in Ventral Superior Temporal Sulcal Area of Common Marmosets

    Science.gov (United States)

    Miyakawa, Naohisa; Banno, Taku; Abe, Hiroshi; Tani, Toshiki; Suzuki, Wataru; Ichinohe, Noritaka

    2017-01-01

    The common marmoset (Callithrix jacchus) is one of the smallest species of primates, with high visual recognition abilities that allow them to judge the identity and quality of food and objects in their environment. To address the cortical processing of visual information related to material surface features in marmosets, we presented a set of stimuli that have identical three-dimensional shapes (bone, torus or amorphous) but different material appearances (ceramic, glass, fur, leather, metal, stone, wood, or matte) to anesthetized marmoset, and recorded multiunit activities from an area ventral to the superior temporal sulcus (STS) using multi-shanked, and depth resolved multi-electrode array. Out of 143 visually responsive multiunits recorded from four animals, 29% had significant main effect only of the material, 3% only of the shape and 43% of both the material and the shape. Furthermore, we found neuronal cluster(s), in which most cells: (1) showed a significant main effect in material appearance; (2) the best stimulus was a glossy material (glass or metal); and (3) had reduced response to the pixel-shuffled version of the glossy material images. The location of the gloss-selective area was in agreement with previous macaque studies, showing activation in the ventral bank of STS. Our results suggest that perception of gloss is an important ability preserved across wide range of primate species. PMID:28367117

  13. Deciphering phonemes from syllables in blood oxygenation level-dependent signals in human superior temporal gyrus.

    Science.gov (United States)

    Zhang, Qingtian; Hu, Xiaolin; Luo, Huan; Li, Jianmin; Zhang, Xiaolu; Zhang, Bo

    2016-03-01

    Linguistic units such as phonemes and syllables are important for speech perception. How the brain encodes these units is not well understood. Many neuroimaging studies have found distinct representations of consonant-vowel syllables that shared one phoneme and differed in the other phoneme (e.g. /ba/ and /da/), but it is unclear whether this discrimination ability is due to the neural coding of phonemes or syllables. We combined functional magnetic resonance imaging with multivariate pattern analysis to explore this question. Subjects listened to nine Mandarin syllables in a consonant-vowel form. We successfully decoded phonemes from the syllables based on the blood oxygenation level-dependent signals in the superior temporal gyrus (STG). Specifically, a classifier trained on the cortical patterns elicited by a set of syllables, which contained two phonemes, could distinguish the cortical patterns elicited by other syllables that contained the two phonemes. The results indicated that phonemes have unique representations in the STG. In addition, there was a categorical effect, i.e. the cortical patterns of consonants were similar, and so were the cortical patterns of vowels. Further analysis showed that phonemes exhibited stronger encoding specificity in the mid-STG than in the anterior STG.

  14. Differential Processing of Consonance and Dissonance within the Human Superior Temporal Gyrus

    Directory of Open Access Journals (Sweden)

    Francine eFoo

    2016-04-01

    Full Text Available The auditory cortex is well known to be critical for music perception, including the perception of consonance and dissonance. Studies on the neural correlates of consonance and dissonance perception have largely employed non-invasive electrophysiological and functional imaging techniques in humans as well as neurophysiological recordings in animals, but the fine-grained spatiotemporal dynamics within the human auditory cortex remain unknown. We recorded electrocorticographic (ECoG signals directly from the lateral surface of either the left or right temporal lobe of 8 patients undergoing neurosurgical treatment as they passively listened to highly consonant and highly dissonant musical chords. We assessed ECoG activity in the high gamma (γhigh, 70-150 Hz frequency range within the superior temporal gyrus (STG and observed two types of cortical sites of interest in both hemispheres: one type showed no significant difference in γhigh activity between consonant and dissonant chords, and another type showed increased γhigh responses to dissonant chords between 75-200ms post-stimulus onset. Furthermore, a subset of these sites exhibited additional sensitivity towards different types of dissonant chords. We also observed a distinct spatial organization of cortical sites in the right STG, with dissonant-sensitive sites located anterior to non-sensitive sites. In sum, these findings demonstrate differential processing of consonance and dissonance in bilateral STG with the right hemisphere exhibiting robust and spatially organized sensitivity towards dissonance.

  15. Vision is superior to touch in shape perception even with equivalent peripheral input.

    Science.gov (United States)

    Cho, Yoonju; Craig, J C; Hsiao, S S; Bensmaia, S J

    2016-01-01

    Results from previous studies suggest that two-dimensional spatial patterns are processed similarly in vision and touch when the patterns are equated for effective size or when visual stimuli are blurred to mimic the spatial filtering of the skin. In the present study, we measured subjects' ability to perceive the shape of familiar and unfamiliar visual and tactile patterns to compare form processing in the two modalities. As had been previously done, the two-dimensional tactile and visual patterns were adjusted in size to stimulate an equivalent number of receptors in the two modalities. We also distorted the visual patterns, using a filter that accurately mimics the spatial filtering effected by the skin to further equate the peripheral images in the two modalities. We found that vision consistently outperformed touch regardless of the precise perceptual task and of how familiar the patterns were. Based on an examination of both the earlier and present data, we conclude that visual processing of both familiar and unfamiliar two-dimensional patterns is superior to its tactile counterpart except under very restricted conditions.

  16. Isolated superior mesenteric artery thrombosis: a rare cause for recurrent abdominal pain in a child.

    Science.gov (United States)

    Dahshan, Ahmed; Donovan, Kevin

    2002-01-01

    A 4-year-old boy was evaluated for recurrent abdominal pain and failure to thrive over a 1-year period in a pediatric subspecialty clinic. Results of the extensive workup mostly were unremarkable. Eventually, imaging studies of the abdominal aorta revealed an isolated thrombosis of the superior mesenteric artery trunk and compensatory hypertrophy of the inferior mesenteric artery. He had been having abdominal angina symptoms and fear of eating. A detailed family history suggested a possible hypercoagulable state. However, an extensive hematologic evaluation did not reveal a recognizable defect that could produce thrombotic events. He was treated by arterial graft bypass surgery and started on conventional anticoagulants. Several months later, he developed repeat, near-total thrombosis of the graft with recurrence of his symptoms. After balloon dilation of the graft and starting him on appropriate anticoagulant maintenance regimen, he had good symptom relief, and the graft remained patent. This presentation was unusually prolonged for the type of vascular problem identified. The possibility of vascular problems in children, therefore, should be considered. Unidentified cause of hereditary clotting tendency is another challenging aspect of this case.

  17. The Neuroanatomical Basis for Posterior Superior Parietal Lobule Control Lateralization of Visuospatial Attention.

    Science.gov (United States)

    Wu, Yan; Wang, Jiaojian; Zhang, Yun; Zheng, Dingchen; Zhang, Jinfeng; Rong, Menglin; Wu, Huawang; Wang, Yinyan; Zhou, Ke; Jiang, Tianzi

    2016-01-01

    The right hemispheric dominance in visuospatial attention in human brain has been well established. Converging evidence has documented that ventral posterior parietal cortex (PPC) plays an important role in visuospatial attention. The role of dorsal PPC subregions, especially the superior parietal lobule (SPL) in visuospatial attention is still controversial. In the current study, we used repetitive transcranial magnetic stimulation (rTMS) and diffusion magnetic resonance imaging (MRI) techniques to test the role of posterior SPL in visuospatial attention and to investigate the potential neuroanatomical basis for right hemisphere dominance in visuospatial function. Transcranial magnetic stimulation (TMS) results unraveled that the right SPL predominantly mediated visuospatial attention compared to left SPL. Anatomical connections analyses between the posterior SPL and the intrahemispheric frontal subregions and the contralateral PPC revealed that right posterior SPL has stronger anatomical connections with the ipsilateral middle frontal gyrus (MFG), with the ipsilateral inferior frontal gyrus (IFG), and with contralateral PPC than that of the left posterior SPL. Furthermore, these asymmetric anatomical connections were closely related to behavioral performances. Our findings indicate that SPL plays a crucial role in regulating visuospatial attention, and dominance of visuospatial attention results from unbalanced interactions between the bilateral fronto-parietal networks and the interhemispheric parietal network.

  18. Changes in Effective Connectivity of the Superior Parietal Lobe during Inhibition and Redirection of Eye Movements

    Directory of Open Access Journals (Sweden)

    Susanne J. Asscheman

    2015-01-01

    Full Text Available Executive control is the ability to flexibly control behavior and is frequently studied with saccadic eye movements. Contrary to frontal oculomotor areas, the role of the superior parietal lobe (SPL in the executive control of saccades remains unknown. To explore the role of SPL networks in saccade control, we performed a saccadic search-step task while acquiring functional magnetic resonance imaging data for 41 participants. Psychophysiological interaction analyses assessed task-related differences in the effective connectivity of SPL with other brain regions during the inhibition and redirection of saccades. Results indicate an increased coupling of SPL with frontal, posterior, and striatal oculomotor areas for redirected saccades versus visually guided saccades. Saccade inhibition versus unsuccessful inhibition revealed an increased coupling of SPL with dorsolateral prefrontal cortex and anterior cingulate cortex. We discuss how these findings relate to ongoing debates about the implementation of executive control and conclude that early attentional control and rapid updating of saccade goals are important signals for executive control.

  19. Changes in Effective Connectivity of the Superior Parietal Lobe during Inhibition and Redirection of Eye Movements.

    Science.gov (United States)

    Asscheman, Susanne J; Thakkar, Katharine N; Neggers, Sebastiaan F W

    2015-01-01

    Executive control is the ability to flexibly control behavior and is frequently studied with saccadic eye movements. Contrary to frontal oculomotor areas, the role of the superior parietal lobe (SPL) in the executive control of saccades remains unknown. To explore the role of SPL networks in saccade control, we performed a saccadic search-step task while acquiring functional magnetic resonance imaging data for 41 participants. Psychophysiological interaction analyses assessed task-related differences in the effective connectivity of SPL with other brain regions during the inhibition and redirection of saccades. Results indicate an increased coupling of SPL with frontal, posterior, and striatal oculomotor areas for redirected saccades versus visually guided saccades. Saccade inhibition versus unsuccessful inhibition revealed an increased coupling of SPL with dorsolateral prefrontal cortex and anterior cingulate cortex. We discuss how these findings relate to ongoing debates about the implementation of executive control and conclude that early attentional control and rapid updating of saccade goals are important signals for executive control.

  20. Posterior superior temporal sulcus responses predict perceived pleasantness of skin stroking

    Directory of Open Access Journals (Sweden)

    Monika Davidovic

    2016-09-01

    Full Text Available Love and affection is expressed through a range of physically intimate gestures, including caresses. Recent studies suggest that posterior temporal lobe areas typically associated with visual processing of social cues also respond to interpersonal touch. Here, we asked whether these areas are selective to caress-like skin stroking. We collected functional magnetic resonance imaging (fMRI data from 23 healthy participants and compared brain responses to skin stroking and vibration. We did not find any significant differences between stroking and vibration in the posterior temporal lobe; however, right posterior superior temporal sulcus (pSTS responses predicted healthy participant's perceived pleasantness of skin stroking, but not vibration. These findings link right pSTS responses to individual variability in perceived pleasantness of caress-like tactile stimuli. We speculate that the right pSTS may play a role in the translation of tactile stimuli into positively valenced, socially relevant interpersonal touch and that this system may be affected in disorders associated with impaired attachment.

  1. Left superior parietal cortex involvement in writing: integrating fMRI with lesion evidence.

    Science.gov (United States)

    Menon, V; Desmond, J E

    2001-10-01

    Writing is a uniquely human skill that we utilize nearly everyday. Lesion studies in patients with Gerstmann's syndrome have pointed to the parietal cortex as being critical for writing. Very little information is, however, available about the precise anatomical location of brain regions subserving writing in normal healthy individuals. In this study, we used functional magnetic resonance imaging (fMRI) to investigate parietal lobe function during writing to dictation. Significant clusters of activation were observed in left superior parietal lobe (SPL) and the dorsal aspects of the inferior parietal cortex (IPC) bordering the SPL. Localized clusters of activation were also observed in the left premotor cortex, sensorimotor cortex and supplementary motor area. No activation cluster was observed in the right hemisphere. These results clearly indicate that writing appears to be primarily organized in the language-dominant hemisphere. Further analysis revealed that within the parietal cortex, activation was significantly greater in the left SPL, compared to left IPC. Together with lesion studies, findings from the present study provide further evidence for the essential role of the left SPL in writing. Deficits to the precise left hemisphere parietal cortex regions identified in the present study may specifically underlie disorders of writing observed in Gerstmann's syndrome and apractic agraphia.

  2. The Superior Labrum, Anterior-to-Posterior ’SLAP’ Lesion

    Science.gov (United States)

    2006-10-01

    and no muscular atrophy. The capsular structures were intact with no evidence of Bankart or Hill Sachs lesions . The superior Military Medicine...include 1) anteroinferior Bankart -type labral lesions in continuity with SLAP lesions , 2) biceps tendon separation with an unstable flap tear of the...The Superior Labrum, Anterior-to-Posterior ‘SLAP’ Lesion Radiology Corner The Superior Labrum, Anterior-to-Posterior ‘SLAP’ Lesion Guarantor

  3. Congenital absence of the azygos vein with persistent left superior vena cava: A case report

    Energy Technology Data Exchange (ETDEWEB)

    Yim, Young Hee; Yi, Jeong Geun; Song, In Young; Park, Jeong Hee [Dept. of Radiology, Konkuk University School of Medicine, Seoul (Korea, Republic of)

    2014-03-15

    Absence of the azygos vein is a very rare variant of venous tributary arrangement which has been reported only in few cases so far. We hereby introduce the chest radiographic and computed tomographic findings of the congenital absence of the azygos vein with bilateral superior vena cava, incidentally detected during a follow-up for rectal cancer. The hemiazygos vein is drained into persistent left superior vena cava via left superior intercostal vein, so called the 'aortic nipple'.

  4. Use of hyaluronic acid gel in the treatment of lagophthalmos in sunken superior sulcus syndrome.

    Science.gov (United States)

    Leyngold, Ilya M; Berbos, Zachary J; McCann, John D; Pariseau, Brett; Leyngold, Ariel R; Anderson, Richard L

    2014-01-01

    To evaluate the use of hyaluronic acid gel in the management of lagophthalmos in sunken superior sulcus syndrome. Lagophthalmos associated with orbital fat atrophy and deep superior sulcus is a known entity described previously. Orbital fat atrophy results in deep superior sulcus where skin, orbicularis muscle, and orbital septum retract posteriorly in the deep superior sulcus, leading to lagophthalmos from suboptimal orbicularis function and effective skin shortening. The authors define this condition as sunken superior sulcus syndrome (SSSS) when the deep superior sulcus leads to exposure keratopathy. Thus, the syndrome consists of deep superior sulcus, lagophthalmos, and exposure keratopathy. Although the use of hyaluronic acid gel has been proposed as a management option for paralytic lagophthalmos, its application in the treatment of lagophthalmos in SSSS has not been reported. In this study, 5 patients (10 eyelids) with SSSS were injected with hyaluronic acid gel in the superior sulcus of the upper eyelid. Injected amount was titrated until the desired point was reached: complete or nearly complete eyelid closure. After an average follow up of 9.5 months, lagoph thalmos improved by 2 mm or 69% (p = 0.02) on the right side and by 1 mm or 71% (p = 0.01) on the left side. Most patients also reported significantly improved ocular comfort and appearance of the superior sulcus. The only complications noted were bruising and temporary uneven contour of the upper eyelid sulcus. Management of lagophthalmos in SSSS with hyaluronic acid gel is an effective and safe alternative to surgery.

  5. Cortical projections to the superior colliculus in tree shrews (Tupaia belangeri).

    Science.gov (United States)

    Baldwin, Mary K L; Wei, Haiyang; Reed, Jamie L; Bickford, Martha E; Petry, Heywood M; Kaas, Jon H

    2013-05-01

    The visuomotor functions of the superior colliculus depend not only on direct inputs from the retina, but also on inputs from neocortex. As mammals vary in the areal organization of neocortex, and in the organization of the number of visual and visuomotor areas, patterns of corticotectal projections vary. Primates in particular have a large number of visual areas projecting to the superior colliculus. As tree shrews are close relatives of primates, and they are also highly visual, we studied the distribution of cortical neurons projecting to the superior colliculus by injecting anatomical tracers into the colliculus. Since projections from visuotopically organized visual areas are expected to match the visuotopy of the superior colliculus, injections at different retinotopic locations in the superior colliculus provide information about the locations and organization of topographic areas in extrastriate cortex. Small injections in the superior colliculus labeled neurons in locations within areas 17 (V1) and 18 (V2) that are consistent with the known topography of these areas and the superior colliculus. In addition, the separate locations of clusters of labeled cells in temporal visual cortex provide evidence for five or more topographically organized areas. Injections that included deeper layers of the superior colliculus also labeled neurons in medial frontal cortex, likely in premotor cortex. Only occasional labeled neurons were observed in somatosensory or auditory cortex. Regardless of tracer injection location, we found that, unlike primates, a substantial projection to the superior colliculus from posterior parietal cortex is not a characteristic of tree shrews.

  6. Superior limb reimplantation. Case presentation. Reimplantación de miembro superior. Presentación de un caso.

    Directory of Open Access Journals (Sweden)

    Leyter Pérez Ferro

    2009-07-01

    Full Text Available Reimplantation surgery is only performed in highly specialized medical institutions. Its success is associate to the development and improvement of microsurgical techniques and to the constant training of the medical team. We present the case of a white patient of 17 years of age, who, as a result of an accident at the working place, suffered the total detachment of his upper right limb in the shoulder area. He was admitted in the emergency unit presenting hypovolemic shock and was immediately stabilized to perform later the limb reimplantation. The postsurgical development was satisfactory, proving that reimplantation can be considered a safe and functional practice in complex wounds or amputation affecting limbs.La cirugía de reimplante se realiza sólo en centros altamente especializados. Su éxito se encuentra ligado al desarrollo y perfeccionamiento de las técnicas microquirúrgicas y al entrenamiento constante del equipo de profesionales que interviene en su realización. Se presenta el caso de un paciente blanco, de 17 años de edad, que por un accidente laboral sufrió el desprendimiento total de su miembro superior derecho a nivel del hombro, y a ras con el tronco. Recibido en la unidad de urgencias médicas en estado de choque hipovolémico, fue estabilizado para realizar luego la reimplantación del miembro. La evolución postoperatoria fue satisfactoria, lo que demuestra que los reimplantes pueden ser considerados como una opción segura y viable de tratamiento, en heridas complejas o amputaciones que afecten a las extremidades.

  7. Cellular bioluminescence imaging.

    Science.gov (United States)

    Welsh, David K; Noguchi, Takako

    2012-08-01

    Bioluminescence imaging of live cells has recently been recognized as an important alternative to fluorescence imaging. Fluorescent probes are much brighter than bioluminescent probes (luciferase enzymes) and, therefore, provide much better spatial and temporal resolution and much better contrast for delineating cell structure. However, with bioluminescence imaging there is virtually no background or toxicity. As a result, bioluminescence can be superior to fluorescence for detecting and quantifying molecules and their interactions in living cells, particularly in long-term studies. Structurally diverse luciferases from beetle and marine species have been used for a wide variety of applications, including tracking cells in vivo, detecting protein-protein interactions, measuring levels of calcium and other signaling molecules, detecting protease activity, and reporting circadian clock gene expression. Such applications can be optimized by the use of brighter and variously colored luciferases, brighter microscope optics, and ultrasensitive, low-noise cameras. This article presents a review of how bioluminescence differs from fluorescence, its applications to cellular imaging, and available probes, optics, and detectors. It also gives practical suggestions for optimal bioluminescence imaging of single cells.

  8. Dramatización creativa en docencia superior de ciencias

    Directory of Open Access Journals (Sweden)

    Alberto Domingo

    2013-11-01

    Full Text Available La dramatización creativa es una estrategia didáctica con muchos antecedentes (Ward, W. Creative Dramatics. D. Appleton & Co., N.Y. 1930, pero poco conocida en la enseñanza superior de ciencias (Scherr, R.E., et al. PER Conference 2010, 1289:293-296. Es una estrategia educativa sin finalidad de exhibición y percibida como improvisada por los participantes, los cuales interpretan y recrean un proceso con sus acciones guiadas sobre la marcha por un instructor. Su propósito no es formar actores ni actuar para otros, sino facilitar la adquisición de un conocimiento desde la vivencia interna y la autoobservación. En humanidades suele consistir en la interpretación de roles humanos o sociales en situaciones determinadas, pero en ciencias es una representación figurada de un proceso científico complejo, donde los participantes asumen el papel de distintos componentes o elementos que intervienen, teniendo que representar objetos o conceptos abstractos y alejados de la percepción real o de la escala humana. La dramatización facilita el aprendizaje significativo y la clarificación de conceptos abstractos, así como la comprensión de procesos complejos a través de una toma de consciencia “desde dentro” de los propios elementos que juegan un papel en los mismos (Michael, J. In pursuit of meaningful learning. Advances in Physiology Education, 2001, 25:145-158; Dee Fink, L. Creating Significant Learning Experiences: An Integrated Approach to Designing College Courses. 2003, Josey-Bass, Wiley. San Francisco, CA 94103-1741. Esta actividad promueve un aprendizaje mediante la autoobservación, aprovechando la capacidad humana natural de representar la propia percepción de fenómenos complejos para comprenderlos. La dramatización creativa estimula el pensamiento lógico e intuitivo, interioriza el conocimiento y genera un placer estético que facilita un aprendizaje significativo y memorable. En esta comunicación se presentan ejemplos pr

  9. Superior semicircular canal dehiscence in East Asian women with osteoporosis

    Directory of Open Access Journals (Sweden)

    Yu Alexander

    2012-07-01

    Full Text Available Abstract Background Superior semicircular canal dehiscence (SSCD may cause Tullio phenomenon (sound-induced vertigo or Hennebert sign (valsalva-induced vertigo due to the absence of bone overlying the SSC. We document a case series of elderly East Asian women with atypical SSCD symptoms, radiologically confirmed dehiscence and concurrent osteoporosis. Methods A retrospective record review was performed on patients with dizziness, vertigo, and/or imbalance from a neurology clinic in a community health center serving the East Asian population in Boston. SSCD was confirmed by multi-detector, high-resolution CT of the temporal bone (with Pöschl and Stenvers reformations and osteoporosis was documented by bone mineral density (BMD scans. Results Of the 496 patients seen in the neurology clinic of a community health center from 2008 to 2010, 76 (17.3% had symptoms of dizziness, vertigo, and/or imbalance. Five (6.6% had confirmed SSCD by multi-detector, high-resolution CT of the temporal bone with longitudinal areas of dehiscence along the long axis of SSC, ranging from 0.4 to 3.0 mm, as seen on the Pöschl view. Two of the 5 patients experienced motion-induced vertigo, two fell due to disequilibrium, and one had chronic dizziness. None had a history of head trauma, otologic surgery, or active intracerebral disease. On neurological examination, two patients had inducible vertigo on Dix-Hallpike maneuver and none experienced cerebellar deficit, Tullio phenomenon, or Hennebert sign. All had documented osteoporosis or osteopenia by BMD scans. Three of them had definite osteoporosis, with T-scores  Conclusions We describe an unusual presentation of SSCD without Tullio phenomenon or Hennebert sign in a population of elderly, East Asian women. There may be an association of SSCD and osteoporosis in this population. Further research is needed to determine the incidence and prevalence of this disorder, as well as the relationship of age, race

  10. The superiority of conservative resection and adjuvant radiation for craniopharyngiomas.

    Science.gov (United States)

    Schoenfeld, Adam; Pekmezci, Melike; Barnes, Michael J; Tihan, Tarik; Gupta, Nalin; Lamborn, Kathleen R; Banerjee, Anu; Mueller, Sabine; Chang, Susan; Berger, Mitchel S; Haas-Kogan, Daphne

    2012-05-01

    The purpose of this study is to evaluate the roles of resection extent and adjuvant radiation in the treatment of craniopharyngiomas. We reviewed the records of 122 patients ages 11-52 years who received primary treatment for craniopharyngioma between 1980 and 2009 at the University of California, San Francisco (UCSF). Primary endpoints were progression free survival (PFS) and overall survival (OS). Secondary endpoints were development of panhypopituitarism, diabetes insipidus (DI), and visual field defects. Of 122 patients, 30 (24%) were treated with gross total resection (GTR) without radiation therapy (RT), 3 (3%) with GTR + RT, 41 (33.6%) with subtotal resection (STR) without RT, and 48 (39.3%) with STR + RT. Median age at diagnosis was 30 years, with 46 patients 18 years or younger. Median follow-up for all patients was 56.4 months (interquartile range 18.9-144.2 months) and 47 months (interquartile range 12.3-121.8 months) for the 60 patients without progression. Fifty six patients progressed, 10 have died, 6 without progression. Median PFS was 61.1 months for all patients. PFS rate at 2 years was 61.5% (95% CI: 52.1-70.9). OS rate at 10 years was 91.1% (95% CI 84.3-97.9). There was no significant difference in PFS and OS between patients treated with GTR vs. STR + XRT (PFS; p = 0.544, OS; p = 0.735), but STR alone resulted in significantly shortened PFS compared to STR + RT or GTR (p < 0.001 for both). STR was associated with significantly shortened OS compared to STR + RT (p = 0.050) and trended to shorter OS compared to GTR (p = 0.066). GTR was associated with significantly greater risk of developing DI (56.3 vs. 13.3% with STR + XRT, p < 0.001) and panhypopituitarism (54.8 vs. 26.7% with STR + XRT, p = 0.014). In conclusion, for patients with craniopharyngioma, STR + RT may provide superior clinical outcome, achieving better disease control than STR and limiting side effects associated with aggressive surgical resection.

  11. Is thoracoscopic patent ductus arteriosus closure superior to conventional surgery?

    Science.gov (United States)

    Stankowski, Tomasz; Aboul-Hassan, Sleiman Sebastian; Marczak, Jakub; Cichon, Romuald

    2015-10-01

    A best evidence topic in cardiac surgery was written according to a structured protocol. The question addressed was whether thoracoscopic patent ductus arteriosus (PDA) closure is superior to conventional surgery. Altogether 821 papers were found using the reported search, 11 of which represented the best evidence to answer the clinical question. The authors, journal, date and country of publication, patient group studied, study type, relevant outcomes and results of these papers are tabulated. Eleven studies included in the analysis consisted of two prospective and three retrospective, non-randomized studies and six case series. Four included studies focused only on preterm infants, three studies enrolled neonates and the other four analysed all age groups from neonates to older children or young adults. There were no differences in mortality between video-assisted thoracoscopic surgery (VATS) and conventional surgery. Two studies suggested that VATS offers shorter operative times. Two papers observed shorter hospital stay, although the other two noted no significant difference. A large prospective trial found VATS to be associated with a lower number of postoperative complications in neonates and infants, whereas other studies suggested no significant differences in short-term postoperative complications. There is little evidence to suggest better musculoskeletal status and cosmesis in neonates following VATS. Conversion from thoracoscopy to thoracotomy described in six papers was seldom and it did not lead to any additional complications. All observational studies confirmed that both techniques are free from major adverse cardiovascular complications and these two techniques can be safely used in all patients qualified for surgical PDA closure. Two studies compared cost-effectiveness between the two techniques; one of them described VATS as significantly more cost-efficient, whereas the other study observed no difference. However, it should be noted that data

  12. Practical Applications of Synthetic Aperture Imaging

    DEFF Research Database (Denmark)

    Nikolov, Svetoslav Ivanov; Kortbek, Jacob; Jensen, Jørgen Arendt

    2010-01-01

    Synthetic aperture imaging has been a focus of research for almost 3 decades. The research carried out at the Center for Fast Ultrasound Imaging has demonstrated that synthetic aperture focusing not only can be used in-vivo, but that it also yields superior B-mode and blood flow images. In the last......, and multiple angle flash imaging are just a few of the names used to describe the commercial implementations of synthetic aperture focusing. Although they sound like different algorithms, they are the same in their core, as revealed in this paper....

  13. MR imaging of the scrotal lesions

    Energy Technology Data Exchange (ETDEWEB)

    Otake, Shoichiro; Inada, Miho; Mike, Takeo; Watanabe, Shigeyuki; Banno, Tatsuo; Ohba, Satoru; Tsugaya, Masayuki; Ohtaguro, Kazuo (Nagoya City Univ. (Japan). Faculty of Medicine)

    1990-04-01

    Magnetic resonance (MR) imaging was performed in 13 patients with the scrotal abnormalities. There were six testicular tumors, one intratesticular hematoma, one hematoma in the epididymis, two epididymitis, one hydrocele, one inguinal hernia and one varicocele. Findings of MR were compared with those of ultrasonography (US) of the 12 cases in which both imaging modalities were performed. MR imaging clearly demonstrated the scrotal pathologic conditions and provided superior information than US. MR imaging is considered to be suited for the evaluation of the scrotal abnormalities. (author).

  14. Coronary magnetic resonance vein imaging: imaging contrast, sequence, and timing.

    Science.gov (United States)

    Nezafat, Reza; Han, Yuchi; Peters, Dana C; Herzka, Daniel A; Wylie, John V; Goddu, Beth; Kissinger, Kraig K; Yeon, Susan B; Zimetbaum, Peter J; Manning, Warren J

    2007-12-01

    Recently, there has been increased interest in imaging the coronary vein anatomy to guide interventional cardiovascular procedures such as cardiac resynchronization therapy (CRT), a device therapy for congestive heart failure (CHF). With CRT the lateral wall of the left ventricle is electrically paced using a transvenous coronary sinus lead or surgically placed epicardial lead. Proper transvenous lead placement is facilitated by the knowledge of the coronary vein anatomy. Cardiovascular MR (CMR) has the potential to image the coronary veins. In this study we propose and test CMR techniques and protocols for imaging the coronary venous anatomy. Three aspects of design of imaging sequence were studied: magnetization preparation schemes (T(2) preparation and magnetization transfer), imaging sequences (gradient-echo (GRE) and steady-state free precession (SSFP)), and imaging time during the cardiac cycle. Numerical and in vivo studies both in healthy and CHF subjects were performed to optimize and demonstrate the utility of CMR for coronary vein imaging. Magnetization transfer was superior to T(2) preparation for contrast enhancement. Both GRE and SSFP were viable imaging sequences, although GRE provided more robust results with better contrast. Imaging during the end-systolic quiescent period was preferable as it coincided with the maximum size of the coronary veins.

  15. An edge detection algorithm for imaging ladar

    Institute of Scientific and Technical Information of China (English)

    Qi Wang(王骐); Ziqin Li(李自勤); Qi Li(李琦); Jianfeng Sun(孙剑峰); Juncheng Fu(傅俊诚)

    2003-01-01

    In this paper, the morphological filter based on parametric edge detection is presented and applied toimaging ladar image with speckle noise. This algorithm and Laplacian of Gaussian (LOG) operator arecompared on edge detection. The experimental results indicate the superior performance of this kind ofthe edge detection.

  16. Image upconversion, a low noise infrared sensor?

    DEFF Research Database (Denmark)

    for detection of infrared images. Silicon cameras have much smaller intrinsic noise than their IR counter part- some models even offer near single photon detection capability. We demonstrate that an ordinary CCD camera combined with a low noise upconversion has superior noise characteristics when compared...

  17. Image upconversion - a low noise infrared sensor?

    DEFF Research Database (Denmark)

    Dam, Jeppe Seidelin; Tidemand-Lichtenberg, Peter; Pedersen, Christian

    for detection of infrared images. Silicon cameras have much smaller intrinsic noise than their IR counter part- some models even offer near single photon detection capability. We demonstrate that an ordinary CCD camera combined with a low noise upconversion has superior noise characteristics when compared...

  18. Sustained attention is associated with right superior longitudinal fasciculus and superior parietal white matter microstructure in children

    DEFF Research Database (Denmark)

    Klarborg, Brith; Skak Madsen, Kathrine; Vestergaard, Martin

    2013-01-01

    the right fronto-parietal cortices was associated with sustained attention performance in a group of 76 typically developing children aged 7-13 years. Sustained attention was assessed using a rapid visual information processing paradigm. The two behavioral measures of interest were the sensitivity index d......Sustained attention develops during childhood and has been linked to the right fronto-parietal cortices in functional imaging studies; however, less is known about its relation to white matter (WM) characteristics. Here we investigated whether the microstructure of the WM underlying and connecting...

  19. fMR-adaptation indicates selectivity to audiovisual content congruency in distributed clusters in human superior temporal cortex

    Directory of Open Access Journals (Sweden)

    Blomert Leo

    2010-02-01

    Full Text Available Abstract Background Efficient multisensory integration is of vital importance for adequate interaction with the environment. In addition to basic binding cues like temporal and spatial coherence, meaningful multisensory information is also bound together by content-based associations. Many functional Magnetic Resonance Imaging (fMRI studies propose the (posterior superior temporal cortex (STC as the key structure for integrating meaningful multisensory information. However, a still unanswered question is how superior temporal cortex encodes content-based associations, especially in light of inconsistent results from studies comparing brain activation to semantically matching (congruent versus nonmatching (incongruent multisensory inputs. Here, we used fMR-adaptation (fMR-A in order to circumvent potential problems with standard fMRI approaches, including spatial averaging and amplitude saturation confounds. We presented repetitions of audiovisual stimuli (letter-speech sound pairs and manipulated the associative relation between the auditory and visual inputs (congruent/incongruent pairs. We predicted that if multisensory neuronal populations exist in STC and encode audiovisual content relatedness, adaptation should be affected by the manipulated audiovisual relation. Results The results revealed an occipital-temporal network that adapted independently of the audiovisual relation. Interestingly, several smaller clusters distributed over superior temporal cortex within that network, adapted stronger to congruent than to incongruent audiovisual repetitions, indicating sensitivity to content congruency. Conclusions These results suggest that the revealed clusters contain multisensory neuronal populations that encode content relatedness by selectively responding to congruent audiovisual inputs, since unisensory neuronal populations are assumed to be insensitive to the audiovisual relation. These findings extend our previously revealed mechanism for

  20. Image Compression and Watermarking scheme using Scalar Quantization

    CERN Document Server

    Swamy, Kilari Veera; Reddy, Y V Bhaskar; Kumar, S Srinivas; 10.5121/ijngn.2010.2104

    2010-01-01

    This paper presents a new compression technique and image watermarking algorithm based on Contourlet Transform (CT). For image compression, an energy based quantization is used. Scalar quantization is explored for image watermarking. Double filter bank structure is used in CT. The Laplacian Pyramid (LP) is used to capture the point discontinuities, and then followed by a Directional Filter Bank (DFB) to link point discontinuities. The coefficients of down sampled low pass version of LP decomposed image are re-ordered in a pre-determined manner and prediction algorithm is used to reduce entropy (bits/pixel). In addition, the coefficients of CT are quantized based on the energy in the particular band. The superiority of proposed algorithm to JPEG is observed in terms of reduced blocking artifacts. The results are also compared with wavelet transform (WT). Superiority of CT to WT is observed when the image contains more contours. The watermark image is embedded in the low pass image of contourlet decomposition. ...