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Sample records for aleksandrs jemeljanovs mra

  1. MR angiography (MRA)

    Energy Technology Data Exchange (ETDEWEB)

    Hasuo, Kanehiro [Kyushu Univ., Fukuoka (Japan). Faculty of Medicine

    1995-12-01

    The primary goal of vascular imaging is the visualization of morphology and hemodynamics. Catheter angiography has been regarded as a gold standard for this purpose. However, MR angiography (MRA) is now increasingly being recognized as an important noninvasive technique for the depiction of vascular diseases and is partially superseding catheter angiography. The author evaluated the usefulness of MRA in the diagnosis of cerebral aneurysms and moyamoya disease. All aneurysms 5 mm or larger in diameter could be detected and most of those less than 5 mm in diameter were also detectable with using a combination of MIP images, target MIP images and source images. In moyamoya disease, the diagnosis could be made in all. For hemodynamic changes, flow directions in the circle of Willis could be visualized by phase-contrast MRA in a normal volunteer. In addition, MRA successfully showed the patency of surgical collaterals in cases of moyamoya disease. Despite some limitations compared with catheter angiography, MRA has a high sensitivity and specificity in the diagnosis of cerebrovascular abnormalities. Furthermore, screening of cerebral aneurysms or cerebrovascular occlusive diseases seems to be a new, and important indication for MRA. (author).

  2. Za vsjo horosheje - finansovaja udavka ili Aleksandr Kaljagin protiv Marinõ Dmitrijevskoi / Boris Tuch

    Index Scriptorium Estoniae

    Tuch, Boris, 1946-

    2007-01-01

    Vastasseisust Venemaa Teatritegelaste Liidu esimehe Aleksandr Kaljagini ja Peterburi teatriajakirja "Peterburgski teatralnõi zhurnal" peatoimetaja Marina Dmitrijevskaja vahel. Aleksandr Kaljagin ähvardab lõpetada ajakirja finantseerimise

  3. Contrast-enhanced peripheral MRA

    DEFF Research Database (Denmark)

    Nielsen, Yousef W; Thomsen, Henrik S

    2012-01-01

    MRI contrast agent is injected intravenously and T1-weighted images are acquired in the subsequent arterial first-pass phase. In order to achieve high quality MR angiograms without interfering venous contamination or artifacts, a number of factors need to be taken into account. This includes magnetic......-state MRA. Gadolinium(Gd)-based contrast agents are used for CE-MRA of the peripheral arteries. Extracellular Gd agents have a pharmacokinetic profile similar to iodinated contrast media. Accordingly, these agents are employed for first-pass MRA. Blood-pool Gd-based agents are characterized by prolonged...... intravascular stay, due to macromolecular structure or protein binding. These agents can be used for first-pass, as well as steady-state MRA. Some Gd-based contrast agents with low thermodynamic stability have been linked to development of nephrogenic systemic fibrosis in patients with severe renal...

  4. Ja protiv zabivanija gvozdei / Aleksandr Gordon ; interv. Nikolai Hrustaljov

    Index Scriptorium Estoniae

    Gordon, Aleksandr

    2003-01-01

    Venemaal Gatshina filmifestivalil "Kirandus ja kino" ("Literatura i kino") sai žürii eriauhinna "Parima debüüdi eest" Aleksandr Gordoni mängufilm oma isa Garri Gordoni jutustuse järgi "Oma lehmade karjane" ("Pastuhh svoihh korov")

  5. Ainult kaks küsimust / Aleksandr Žedeljov

    Index Scriptorium Estoniae

    Žedeljov, Aleksandr

    2010-01-01

    Vene Teatris juunis 2011 esietenduvast live performance'ist "Alice", mis koosneb kaasaegsest koreograafiast, originaalsest autorimuusikast. videost, animatsioonist ja varjuteatrist. Lewis Carroll'i teosel "Alice Imedemaal" põhineva lavastuse autorid on Olga Privis, Aleksandr Žedeljov, MTÜ Fat Snail, MTÜ Vastik Sipsik, MTÜ HeliTelg

  6. Renal artery stenosis: comparative assessment by unenhanced renal artery mra versus contrast-enhanced MRA

    International Nuclear Information System (INIS)

    Khoo, Michael M.Y.; Deeab, Dhafer; Gedroyc, Wladyslaw M.W.; Dick, Elizabeth A.; Duncan, Neil; Taube, David

    2011-01-01

    To evaluate steady-state free precession (SSFP) non-contrast-enhanced MR angiography (Unenhanced-MRA) versus conventional contrast-enhanced MR angiography (CE-MRA) in the detection of renal artery stenosis (RAS). Retrospective analysis of 70 consecutive patients referred for suspected RAS, examined by SSFP Unenhanced-MRA and CE-MRA. Image quality, quality of visible renal arterial segments, presence and grade of RAS were evaluated. The Unenhanced-MRA were compared against reference standard CE-MRA results. 149 renal arteries were assessed with 21 haemodynamically significant stenoses (≥50% stenosis) demonstrated by CE-MRA. Combined sensitivity and specificity for RAS detection by Unenhanced-MRA was 72.8% and 97.8% respectively. There is substantial correlation for RAS detection between Unenhanced-MRA and CE-MRA with kappa values of between 0.64 and 0.74. There was excellent inter-observer correlation for RAS on Unenhanced-MRA (kappa values 0.82-1.0). Our study has shown Unenhanced-MRA to be a viable alternative to CE-MRA, yielding images equal in quality without the requirement for gadolinium contrast agents. The sensitivity and specificity for the detection of haemodynamically significant stenoses are comparable to CE-MRA. Potentially, Unenhanced-MRA could be used as an initial investigation to avoid performing CE-MRA in patients with normal renal arteries, however we suggest that its real value will lie in being complementary to CE-MRA. (orig.)

  7. Your Radiologist Explains Magnetic Resonance Angiography (MRA)

    Medline Plus

    Full Text Available ... with you about magnetic resonance angiography, or as it’s commonly known, MRA. MRA is a noninvasive test ... of the major blood vessels throughout your body. It may be performed with or without contrast material ...

  8. Your Radiologist Explains Magnetic Resonance Angiography (MRA)

    Medline Plus

    Full Text Available ... it’s commonly known, MRA. MRA is a noninvasive test that uses a powerful magnetic field and a computer to produce detailed pictures of the major blood vessels throughout your body. It may be performed ...

  9. Your Radiologist Explains Magnetic Resonance Angiography (MRA)

    Medline Plus

    Full Text Available ... Sponsored by Image/Video Gallery Your Radiologist Explains Magnetic Resonance Angiography (MRA) Transcript Welcome to Radiology Info dot ... I’d like to talk with you about magnetic resonance angiography, or as it’s commonly known, MRA. MRA ...

  10. Your Radiologist Explains Magnetic Resonance Angiography (MRA)

    Medline Plus

    Full Text Available ... talk with you about magnetic resonance angiography, or as it’s commonly known, MRA. MRA is a noninvasive ... possibility that you’re pregnant tell your doctor as well. On the day of your exam, it’s ...

  11. Your Radiologist Explains Magnetic Resonance Angiography (MRA)

    Medline Plus

    Full Text Available Toggle navigation Test/Treatment Patient Type Screening/Wellness Disease/Condition Safety En Español More Info Images/Videos About Us News Physician ... it’s commonly known, MRA. MRA is a noninvasive test that uses a powerful magnetic field and a ...

  12. Kas e-saba leevendab olukorda? / Jelena Kazina, Aleksandr Bõstrov, Raiki Nelk

    Index Scriptorium Estoniae

    Kazina, Jelena

    2010-01-01

    Küsimusele elektroonilist piirijärjekorda võimaldava seaduse kohta vastavad Baltliner OÜ projektijuht Jelena Kazina, endine Cargoman OÜ juhataja Aleksandr Bõstrov ja AG Logistik OÜ ekspedeerija Raiki Nelk

  13. Eesti kirjandus Moskvas : ajutine vaikus : [intervjuu] / Vera Ruber, Aleksandr Tomberg ; üles kirjut. Triin Parts

    Index Scriptorium Estoniae

    Ruber, Vera, 1925-2011

    1997-01-01

    Emil Tode (T. Õnnepalu) 'Piiririik' ilmub Vera Ruberi tõlkes ajakirja 'Druzhba Narodov' detsembrinumbris. Aleksandr Tombergil on valmis romaani 'Hind' tõlge, kuid seni puuduvad avaldamisvõimalused

  14. Your Radiologist Explains Magnetic Resonance Angiography (MRA)

    Medline Plus

    Full Text Available ... to Radiology Info dot org Hello, I’m Dr. Elliot Fishman, a radiologist at Johns Hopkins Hospital ... of your body and to identify abnormalities and disease. If you’re scheduled for an MRA scan, ...

  15. Your Radiologist Explains Magnetic Resonance Angiography (MRA)

    Medline Plus

    Full Text Available ... Disorders Video: The Basketball Game: An MRI Story Radiology and You Sponsored by Image/Video Gallery Your ... Explains Magnetic Resonance Angiography (MRA) Transcript Welcome to Radiology Info dot org Hello, I’m Dr. Elliot ...

  16. Your Radiologist Explains Magnetic Resonance Angiography (MRA)

    Medline Plus

    Full Text Available ... MRA scan, there are several things you can do to prepare for the examination. First of all, ... To help ensure current and accurate information, we do not permit copying but encourage linking to this ...

  17. Your Radiologist Explains Magnetic Resonance Angiography (MRA)

    Medline Plus

    Full Text Available ... Angiography (MRA) Transcript Welcome to Radiology Info dot org Hello, I’m Dr. Elliot Fishman, a radiologist ... question you might have, visit Radiology Info dot org. Thank you for your time and for your ...

  18. Your Radiologist Explains Magnetic Resonance Angiography (MRA)

    Medline Plus

    Full Text Available ... an MRA scan, there are several things you can do to prepare for the examination. First of ... medical devices implanted in your body as these can interfere with the magnetic field of the MRI ...

  19. Your Radiologist Explains Magnetic Resonance Angiography (MRA)

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    Full Text Available ... mild sedative prior to the examination. For more information about Magnetic Resonance Angiography of MRA or any ... Inc. (RSNA). To help ensure current and accurate information, we do not permit copying but encourage linking ...

  20. Magnetic resonance angiography (MRA) of the calf station at 3.0 T: intraindividual comparison of non-enhanced ECG-gated flow-dependent MRA, continuous table movement MRA and time-resolved MRA

    International Nuclear Information System (INIS)

    Haneder, Stefan; Attenberger, Ulrike I.; Riffel, Philipp; Henzler, Thomas; Schoenberg, Stefan O.; Michaely, Henrik J.

    2011-01-01

    To compare 3D non-enhanced ECG-gated inflow-dependent MRA (NE-MRA) vs. continuous table movement (CTM) MR-angiography and time-resolved TWIST-MRA in the calf station at 3.0 T in a clinical patient collective. 36 patients (27 male/9 female, 66.1 ± 14.4 years) with PAOD (stage II-IV) underwent during a single MRI: NE-MRA, contrast-enhanced CTM-MRA and TWIST-MRA with a single dose of a gadolinium-based contrast agent. The image quality (IQ) and the degree of stenoses were rated on a four-point scale. Positive (PPV) and negative predictive values (NPV), sensitivity (SS) and specificity (SP) for stenoses detection were calculated for NE-MRA vs. CTM-MRA and vs. TWIST-MRA. Values were obtained for overall graduation of wall changes and for severe stenoses (>70%). With NE-MRA 122/288 segments were not assessable. Compared with CTM-MRA and TWIST-MRA the IQ was significantly inferior (p < 0.0001 to p = 0.0426). CTM-MRA/TWIST-MRA detected stenoses in 44.9%/46.1% of the segments, NE-MRA in 53.5%. SS/NPV of the NE-MRA ranged from 97.8 to 100%. The SP and PPV ranged from 72.7 to 85.5% and 66.7 to 78.2%. Contrast-enhanced MRA techniques are superior to NE-MRA regarding IQ and correct identification of stenoses. If technically successful, NE-MRA is characterised by high NPV and overestimation of the degree of stenoses. (orig.)

  1. Nonenhanced magnetic resonance angiography (MRA) of the calf arteries at 3 Tesla: intraindividual comparison of 3D flow-dependent subtractive MRA and 2D flow-independent non-subtractive MRA.

    Science.gov (United States)

    Knobloch, Gesine; Lauff, Marie-Teres; Hirsch, Sebastian; Schwenke, Carsten; Hamm, Bernd; Wagner, Moritz

    2016-12-01

    To prospectively compare 3D flow-dependent subtractive MRA vs. 2D flow-independent non-subtractive MRA for assessment of the calf arteries at 3 Tesla. Forty-two patients with peripheral arterial occlusive disease underwent nonenhanced MRA of calf arteries at 3 Tesla with 3D flow-dependent subtractive MRA (fast spin echo sequence; 3D-FSE-MRA) and 2D flow-independent non-subtractive MRA (balanced steady-state-free-precession sequence; 2D-bSSFP-MRA). Moreover, all patients underwent contrast-enhanced MRA (CE-MRA) as standard-of-reference. Two readers performed a per-segment evaluation for image quality (4 = excellent to 0 = non-diagnostic) and severity of stenosis. Image quality scores of 2D-bSSFP-MRA were significantly higher compared to 3D-FSE-MRA (medians across readers: 4 vs. 3; p Tesla with significantly higher image quality and diagnostic accuracy compared to 3D flow-dependent subtractive MRA (3D-FSE-MRA). • 2D flow-independent non-subtractive MRA (2D-bSSFP-MRA) is a robust NE-MRA technique at 3T • 2D-bSSFP-MRA outperforms 3D flow-dependent subtractive MRA (3D-FSE-MRA) as NE-MRA of calf arteries • 2D-bSSFP-MRA is a promising alternative to CE-MRA for calf PAOD evaluation.

  2. Nonenhanced ECG-gated quiescent-interval single-shot MRA (QISS-MRA) of the lower extremities: Comparison with contrast-enhanced MRA

    Energy Technology Data Exchange (ETDEWEB)

    Klasen, J. [Department of Diagnostic and Interventional Radiology, University of Duesseldorf, Medical Faculty, Duesseldorf (Germany); Blondin, D., E-mail: blondin@med.uni-duesseldorf.de [Department of Diagnostic and Interventional Radiology, University of Duesseldorf, Medical Faculty, Duesseldorf (Germany); Schmitt, P. [Siemens AG, Healthcare Sector, Erlangen (Germany); Bi, X. [Siemens Healthcare, Chicago, IL (United States); Sansone, R. [Department of Cardiology, University of Duesseldorf, Medical Faculty, Duesseldorf (Germany); Wittsack, H.-J.; Kroepil, P.; Quentin, M.; Kuhlemann, J.; Miese, F. [Department of Diagnostic and Interventional Radiology, University of Duesseldorf, Medical Faculty, Duesseldorf (Germany); Heiss, C.; Kelm, M. [Department of Cardiology, University of Duesseldorf, Medical Faculty, Duesseldorf (Germany); Antoch, G.; Lanzman, R.S. [Department of Diagnostic and Interventional Radiology, University of Duesseldorf, Medical Faculty, Duesseldorf (Germany)

    2012-05-15

    Aim: To evaluate electrocardiogram (ECG)-gated quiescent-interval single-shot magnetic resonance angiography (QISS-MRA) for nonenhanced assessment of peripheral artery occlusive disease (PAOD) using contrast-enhanced MRA (CE-MRA) as the reference standard. Materials and methods: Twenty-seven patients (mean age 66.6 {+-} 10.8 years) with PAOD were included in the study. QISS-MRA and CE-MRA of the lower extremity were performed using a 1.5 T MR scanner. In each patient, subjective image quality and the degree of stenosis were evaluated on a four-point scale for 15 predefined arterial segments. Results: Twenty-five of the 27 patients were considered for analysis. Subjective image quality of QISS-MRA was significantly lower for the distal aorta, pelvic arteries, and femoral arteries as compared to CE-MRA (p < 0.01), while no significant difference was found for other vascular segments. The degree of stenosis was overestimated with QISS-MRA in 23 of 365 (6.3%) segments and underestimated in two of 365 (0.5%) segments. As compared to CE-MRA, QISS-MRA had a high sensitivity (98.6%), specificity (96%) as well as positive and negative predictive value (88.7 and 99.6%, respectively) for the detection of significant stenosis ({>=}50%). Conclusion: ECG-gated QISS-MRA is a promising imaging technique for reliable assessment of PAOD without the use of contrast material.

  3. Nonenhanced ECG-gated quiescent-interval single-shot MRA (QISS-MRA) of the lower extremities: Comparison with contrast-enhanced MRA

    International Nuclear Information System (INIS)

    Klasen, J.; Blondin, D.; Schmitt, P.; Bi, X.; Sansone, R.; Wittsack, H.-J.; Kröpil, P.; Quentin, M.; Kuhlemann, J.; Miese, F.; Heiss, C.; Kelm, M.; Antoch, G.; Lanzman, R.S.

    2012-01-01

    Aim: To evaluate electrocardiogram (ECG)-gated quiescent-interval single-shot magnetic resonance angiography (QISS-MRA) for nonenhanced assessment of peripheral artery occlusive disease (PAOD) using contrast-enhanced MRA (CE-MRA) as the reference standard. Materials and methods: Twenty-seven patients (mean age 66.6 ± 10.8 years) with PAOD were included in the study. QISS-MRA and CE-MRA of the lower extremity were performed using a 1.5 T MR scanner. In each patient, subjective image quality and the degree of stenosis were evaluated on a four-point scale for 15 predefined arterial segments. Results: Twenty-five of the 27 patients were considered for analysis. Subjective image quality of QISS-MRA was significantly lower for the distal aorta, pelvic arteries, and femoral arteries as compared to CE-MRA (p < 0.01), while no significant difference was found for other vascular segments. The degree of stenosis was overestimated with QISS-MRA in 23 of 365 (6.3%) segments and underestimated in two of 365 (0.5%) segments. As compared to CE-MRA, QISS-MRA had a high sensitivity (98.6%), specificity (96%) as well as positive and negative predictive value (88.7 and 99.6%, respectively) for the detection of significant stenosis (≥50%). Conclusion: ECG-gated QISS-MRA is a promising imaging technique for reliable assessment of PAOD without the use of contrast material.

  4. "...dorogi tshastnõje i mezhvremennõje" / Aleksandr Solzhenitsõn

    Index Scriptorium Estoniae

    Солженицын, Александр Исаевич, 1918-2008

    1999-01-01

    Katkend mälestustest: Solzhenitsõn, Aleksandr. Ugodila zernõshko promezh dvuhh zhernovov : otserki izgnanija. Tsh. 1 // Novõi Mir (1998) nr. 9, lk. 47-125. Ka A. Solzhenitsõni kiri V. Nabokovile (16. mai 1972)

  5. MRA in inflammatory disorders of the central nervous system

    International Nuclear Information System (INIS)

    Felber, S.

    2000-01-01

    In this review, we discuss the diagnostic potential of time of flight (TOF) MRA and contrast enhanced (CE) MRA in inflammatory disorders of the meninges and the brain. Cerebrovascular complications are frequently observed during infectious meningoencepalitis. 3D TOF-MRA and CE-MRA are complementary for the detection of basal intracranial artery stenosis and septic cerebral vein and sinus thrombosis due to secondary vasculitis. MRA reveals stenosis and occlusion as indirect signs of vasculitis, whereas MRI shows the inflammation of the brain and meninges and occasionally the vessel wall, together with the ischemic or hemorrhagic complication. In case of septic emboli MRA can detect peripheral occlusions and 'mycotic' aneurysms. For the diagnosis of noninfectious vasculitides of the intracranial vessels, high resolution 3D TOF-MRA is superior to CE-MRA for the detection of multiloculated segmental stenoses. However, there are presently no prospective studies on the sensitivity and specificity of MRA for these indications. Therefore, only positive MRA results can directly influence clinical management. In case of normal MRA, confirmation by catheder angiography may still be required. (orig.) [de

  6. An empirical technique to improve MRA imagin

    Directory of Open Access Journals (Sweden)

    Sonia Rauf

    2016-07-01

    Full Text Available In the Region Growing Algorithm (RGA results of segmentation are totally dependent on the selection of seed point, as an inappropriate seed point may lead to poor segmentation. However, the majority of MRA (Magnetic Resonance Angiography datasets do not contain required region (vessels in starting slices. An Enhanced Region Growing Algorithm (ERGA is proposed for blood vessel segmentation. The ERGA automatically calculates the threshold value on the basis of maximum intensity values of all the slices and selects an appropriate starting slice of the image which has a appropriate seed point. We applied our proposed technique on different patients of MRA datasets of different resolutions and have got improved segmented images with reduction of noise as compared to tradition RGA.

  7. Poet and profligate: the secrets of Aleksandr Sergeyevich Pushkin's (1799-1837) personality and maladies.

    Science.gov (United States)

    Lerner, Vladimir; Witztum, Eliezer

    2015-11-01

    Aleksandr Sergeyevich Pushkin (1799-1837) was one of the great figures of Russian poetry and literature. There are numerous publications about his life, adventures and creative work. However, little has been written about his character, mental state and the condition of his wound during his fatal duel. Furthermore, his sexual illnesses and their nature were discussed even less. This paper attempts to lift the veil from this mystery. © The Author(s) 2013.

  8. Contrast-enhanced peripheral MRA. Technique and contrast agents

    International Nuclear Information System (INIS)

    Nielsen, Yousef W.; Thomsen, Henrik S.

    2012-01-01

    In the last decade contrast-enhanced magnetic resonance angiography (CE-MRA) has gained wide acceptance as a valuable tool in the diagnostic work-up of patients with peripheral arterial disease. This review presents current concepts in peripheral CE-MRA with emphasis on MRI technique and contrast agents. Peripheral CE-MRA is defined as an MR angiogram of the arteries from the aortic bifurcation to the feet. Advantages of CE-MRA include minimal invasiveness and lack of ionizing radiation. The basic technique employed for peripheral CE-MRA is the bolus-chase method. With this method a paramagnetic MRI contrast agent is injected intravenously and T1-weighted images are acquired in the subsequent arterial first-pass phase. In order to achieve high quality MR angiograms without interfering venous contamination or artifacts, a number of factors need to be taken into account. This includes magnetic field strength of the MRI system, receiver coil configuration, use of parallel imaging, contrast bolus timing technique, and k-space filling strategies. Furthermore, it is possible to optimize peripheral CE-MRA using venous compression techniques, hybrid scan protocols, time-resolved imaging, and steady-state MRA. Gadolinium(Gd)-based contrast agents are used for CE-MRA of the peripheral arteries. Extracellular Gd agents have a pharmacokinetic profile similar to iodinated contrast media. Accordingly, these agents are employed for first-pass MRA. Blood-pool Gd-based agents are characterized by prolonged intravascular stay, due to macromolecular structure or protein binding. These agents can be used for first-pass, as well as steady-state MRA. Some Gd-based contrast agents with low thermodynamic stability have been linked to development of nephrogenic systemic fibrosis in patients with severe renal insufficiency. Using optimized technique and a stable MRI contrast agent, peripheral CE-MRA is a safe procedure with diagnostic accuracy close to that of conventional catheter X

  9. Nonenhanced magnetic resonance angiography (MRA) of the calf arteries at 3 Tesla: intraindividual comparison of 3D flow-dependent subtractive MRA and 2D flow-independent non-subtractive MRA

    Energy Technology Data Exchange (ETDEWEB)

    Knobloch, Gesine; Lauff, Marie-Teres; Hirsch, Sebastian; Hamm, Bernd; Wagner, Moritz [Charite - Universitaetsmedizin Berlin, Department of Radiology, Berlin (Germany); Schwenke, Carsten [SCO:SSiS Statistical Consulting, Berlin (Germany)

    2016-12-15

    To prospectively compare 3D flow-dependent subtractive MRA vs. 2D flow-independent non-subtractive MRA for assessment of the calf arteries at 3 Tesla. Forty-two patients with peripheral arterial occlusive disease underwent nonenhanced MRA of calf arteries at 3 Tesla with 3D flow-dependent subtractive MRA (fast spin echo sequence; 3D-FSE-MRA) and 2D flow-independent non-subtractive MRA (balanced steady-state-free-precession sequence; 2D-bSSFP-MRA). Moreover, all patients underwent contrast-enhanced MRA (CE-MRA) as standard-of-reference. Two readers performed a per-segment evaluation for image quality (4 = excellent to 0 = non-diagnostic) and severity of stenosis. Image quality scores of 2D-bSSFP-MRA were significantly higher compared to 3D-FSE-MRA (medians across readers: 4 vs. 3; p < 0.0001) with lower rates of non-diagnostic vessel segments on 2D-bSSFP-MRA (reader 1: <1 % vs. 15 %; reader 2: 1 % vs. 29 %; p < 0.05). Diagnostic performance of 2D-bSSFP-MRA and 3D-FSE-MRA across readers showed sensitivities of 89 % (214/240) vs. 70 % (168/240), p = 0.0153; specificities: 91 % (840/926) vs. 63 % (585/926), p < 0.0001; and diagnostic accuracies of 90 % (1054/1166) vs. 65 % (753/1166), p < 0.0001. 2D flow-independent non-subtractive MRA (2D-bSSFP-MRA) is a robust nonenhanced MRA technique for assessment of the calf arteries at 3 Tesla with significantly higher image quality and diagnostic accuracy compared to 3D flow-dependent subtractive MRA (3D-FSE-MRA). (orig.)

  10. Oma rahva säästmine on riigi ülim ülesanne / Aleksandr Solzhenitsõn ; interv. Vitali Tretjak

    Index Scriptorium Estoniae

    Solženitsõn, Aleksandr, 1918-2008

    2006-01-01

    Venemaa nädalalehes Moskovskije Novosti ilmunud vene ühiskondliku mõtte korüfee Aleksandr Solzhenitsõni intervjuu, mis analüüsib olukorda maailmas ja Venemaal. Vt. samas: Ilmar Mikiver. Solzhenitsõn - apostaat?; Aleksandr Solzhenitsõn Eestis

  11. Aleksandr Gol’ts, Armiia Rossii: 11 poteriannykh let, Moscow: Zakharov, 2004, 224 pp.

    Directory of Open Access Journals (Sweden)

    Richard F. Staar

    2004-07-01

    Full Text Available Specialist of military questions, Aleksandr Gol’ts worked for Red Star (Krasnaia Zvezda, the newspaper of the Russian Ministry of Defense, before joining various prestigious magazines such as Itogi. He is considered one of the most prominent journalist on military matters in Russia today. His book, “The Russian Army : 11 lost years”, is dedicated to military reforms in post-Soviet Russia. With his extensive knowledge of institutional realities of the military establishment, Gol’ts provides a...

  12. Applicability of PROSET-MRA for evaluating pediatric moyamoya disease

    International Nuclear Information System (INIS)

    Tsujimura, Asuka; Kojima, Hideyuki; Yabe, Hitoshi

    2011-01-01

    MR angiography (MRA) for pediatric moyamoya disease is important as a non-invasive examination to diagnose blood flow in the brain. Generally, the conventional 3D-time of flight (TOF) MRA is used for moyamoya disease. However, retrobulbar and subcutaneous fat of the head show high intensity signals. We found that using the conventional MRA to diagnose the details of brain blood flow is difficult and that it cannot differentiate moyamoya vessels and fat. It similarly obscures the ophthalmic artery and superficial temporal artery that overlap with fat in the direction of the maximum intensity projection (MIP). Therefore, we devised an MRA technique with fat suppression to diagnose blood flow in moyamoya disease patients: MR angiography with the principle of selective excitation technique (PROSET). The scan time does not need to be increased. We studied the TOF effect in constant and pulsatile flows and the water selective excitation method with the binominal pulse (PROSET) for the fat suppression effect for moyamoya disease. The results showed that PROSET-MRA achieved better image results than conventional MRA. The development of collaterals of the superficial temporal artery and occipital artery in pre- and post-operation moyamoya disease could be clearly visualized and evaluated. The PROSET-MRA method is useful for evaluating pre- and post-operation (encephalo-duro-arterio-synangiosis, encephalo-myo-synangiosis) blood flow reconstruction for patients who have moyamoya disease. (author)

  13. CBCT-based 3D MRA and angiographic image fusion and MRA image navigation for neuro interventions.

    Science.gov (United States)

    Zhang, Qiang; Zhang, Zhiqiang; Yang, Jiakang; Sun, Qi; Luo, Yongchun; Shan, Tonghui; Zhang, Hao; Han, Jingfeng; Liang, Chunyang; Pan, Wenlong; Gu, Chuanqi; Mao, Gengsheng; Xu, Ruxiang

    2016-08-01

    Digital subtracted angiography (DSA) remains the gold standard for diagnosis of cerebral vascular diseases and provides intraprocedural guidance. This practice involves extensive usage of x-ray and iodinated contrast medium, which can induce side effects. In this study, we examined the accuracy of 3-dimensional (3D) registration of magnetic resonance angiography (MRA) and DSA imaging for cerebral vessels, and tested the feasibility of using preprocedural MRA for real-time guidance during endovascular procedures.Twenty-three patients with suspected intracranial arterial lesions were enrolled. The contrast medium-enhanced 3D DSA of target vessels were acquired in 19 patients during endovascular procedures, and the images were registered with preprocedural MRA for fusion accuracy evaluation. Low-dose noncontrasted 3D angiography of the skull was performed in the other 4 patients, and registered with the MRA. The MRA was overlaid afterwards with 2D live fluoroscopy to guide endovascular procedures.The 3D registration of the MRA and angiography demonstrated a high accuracy for vessel lesion visualization in all 19 patients examined. Moreover, MRA of the intracranial vessels, registered to the noncontrasted 3D angiography in the 4 patients, provided real-time 3D roadmap to successfully guide the endovascular procedures. Radiation dose to patients and contrast medium usage were shown to be significantly reduced.Three-dimensional MRA and angiography fusion can accurately generate cerebral vasculature images to guide endovascular procedures. The use of the fusion technology could enhance clinical workflow while minimizing contrast medium usage and radiation dose, and hence lowering procedure risks and increasing treatment safety.

  14. Combined large field-of-view MRA and time-resolved MRA of the lower extremities: Impact of acquisition order on image quality

    International Nuclear Information System (INIS)

    Riffel, Philipp; Haneder, Stefan; Attenberger, Ulrike I.; Brade, Joachim; Schoenberg, Stefan O.; Michaely, Henrik J.

    2012-01-01

    Purpose: Different approaches exist for hybrid MRA of the calf station. So far, the order of the acquisition of the focused calf MRA and the large field-of-view MRA has not been scientifically evaluated. Therefore the aim of this study was to evaluate if the quality of the combined large field-of-view MRA (CTM MR angiography) and time-resolved MRA with stochastic interleaved trajectories (TWIST MRA) depends on the order of acquisition of the two contrast-enhanced studies. Methods: In this retrospective study, 40 consecutive patients (mean age 68.1 ± 8.7 years, 29 male/11 female) who had undergone an MR angiographic protocol that consisted of CTM-MRA (TR/TE, 2.4/1.0 ms; 21° flip angle; isotropic resolution 1.2 mm; gadolinium dose, 0.07 mmol/kg) and TWIST-MRA (TR/TE 2.8/1.1; 20° flip angle; isotropic resolution 1.1 mm; temporal resolution 5.5 s, gadolinium dose, 0.03 mmol/kg), were included. In the first group (group 1) TWIST-MRA of the calf station was performed 1–2 min after CTM-MRA. In the second group (group 2) CTM-MRA was performed 1–2 min after TWIST-MRA of the calf station. The image quality of CTM-MRA and TWIST-MRA were evaluated by 2 two independent radiologists in consensus according to a 4-point Likert-like rating scale assessing overall image quality on a segmental basis. Venous overlay was assessed per examination. Results: In the CTM-MRA, 1360 segments were included in the assessment of image quality. CTM-MRA was diagnostic in 95% (1289/1360) of segments. There was a significant difference (p < 0.0001) between both groups with regard to the number of segments rated as excellent and moderate. The image quality was rated as excellent in group 1 in 80% (514/640 segments) and in group 2 in 67% (432/649), respectively (p < 0.0001). In contrast, the image quality was rated as moderate in the first group in 5% (33/640) and in the second group in 19% (121/649) respectively (p < 0.0001). The venous overlay was disturbing in 10% in group 1 and 20% in group

  15. Peripheral occlusive vascular disease: Diagnostic performance of MRA and DSA

    International Nuclear Information System (INIS)

    Krug, B.; Kugel, H.; Harnischmacher, U.; Heindel, W.; Altenburg, A.; Fischbach, R.; Schmidt, R.

    1995-01-01

    In 59 patients with arterial flow disturbances 2-D inflow sequence of the abdominal and lower leg arteries were prospectively obtained on a 1.5 T MR-imager and were compared with additional DSA examinations. Supplementary Phase Contraste RSE ('Rapid Sequential Excitation') sequences were carried out in 29 patients. MRA and DSA angiograms were evaluated in random order by 4 readers using a questionnaire. The assessment of image quality were evaluated by variance analysis. Diagnostic performance of MRA and DSA was assessed by comparison of the readers' diagnostic assessments with reference diagnoses established by a radiologist and a vascular surgeon with full knowledge of all data concerning a patient. Image quality of inflow MRA was considered inferior to i.a. DSA (p [de

  16. Initial experience with 3T 3D-TOF MRA in the diagnosis of intracranial aneurysms

    International Nuclear Information System (INIS)

    Senba, Yoshiki; Takahashi, Shizue; Matsubara, Ichiro; Sadamoto, Kazuhiko; Miki, Hitoshi; Mochizuki, Teruhito

    2006-01-01

    We assessed the value of 3T 3D-time of flight (TOF) MR angiography (MRA) in the diagnosis of intracranial aneurysms compared with 1.5T 3D-TOF MRA. Twenty-one patients with 22 aneurysms underwent MRA at 1.5T and 3T. Images were interpreted by two radiologists. Each of nine aneurysms that had been considered ''definite'' at 1.5T 3D-TOF MRA were considered ''definite'' at 3T 3D-TOF MRA. Seven aneurysms that had been considered ''suspicious'' at 1.5T MRA were considered ''definite'' at 3T. And four aneurysms that had been considered ''suspicious'' at 1.5T were considered ''negative'' at 3T. We concluded that 3T 3D-TOF MRA is superior to 1.5T 3D-TOF MRA in the diagnosis of intracranial aneurysms. (author)

  17. Comparison of 3D TOF-MRA and 3D CE-MRA at 3 T for imaging of intracranial aneurysms

    International Nuclear Information System (INIS)

    Cirillo, Mario; Scomazzoni, Francesco; Cirillo, Luigi; Cadioli, Marcello; Simionato, Franco; Iadanza, Antonella; Kirchin, Miles; Righi, Claudio; Anzalone, Nicoletta

    2013-01-01

    Purpose: To compare 3 T elliptical-centric CE MRA with 3 T TOF MRA for the detection and characterization of unruptured intracranial aneurysms (UIAs), by using digital subtracted angiography (DSA) as reference. Materials and methods: Twenty-nine patients (12 male, 17 female; mean age: 62 years) with 41 aneurysms (34 saccular, 7 fusiform; mean diameter: 8.85 mm [range 2.0–26.4 mm]) were evaluated with MRA at 3 T each underwent 3D TOF-MRA examination without contrast and then a 3D contrast-enhanced (CE-MRA) examination with 0.1 mmol/kg bodyweight gadobenate dimeglumine and k-space elliptic mapping (Contrast ENhanced Timing Robust Angiography [CENTRA]). Both TOF and CE-MRA images were used to evaluate morphologic features that impact the risk of rupture and the selection of a treatment. Almost half (20/41) of UIAs were located in the internal carotid artery, 7 in the anterior communicating artery, 9 in the middle cerebral artery and 4 in the vertebro-basilar arterial system. All patients also underwent DSA before or after the MR examination. Results: The CE-MRA results were in all cases consistent with the DSA dataset. No differences were noted between 3D TOF-MRA and CE-MRA concerning the detection and location of the 41 aneurysms or visualization of the parental artery. Differences were apparent concerning the visualization of morphologic features, especially for large aneurysms (>13 mm). An irregular sac shape was demonstrated for 21 aneurysms on CE-MRA but only 13/21 aneurysms on 3D TOF-MRA. Likewise, CE-MRA permitted visualization of an aneurismal neck and calculation of the sac/neck ratio for all 34 aneurysms with a neck demonstrated at DSA. Conversely, a neck was visible for only 24/34 aneurysms at 3D TOF-MRA. 3D CE-MRA detected 15 aneurysms with branches originating from the sac and/or neck, whereas branches were recognized in only 12/15 aneurysms at 3D TOF-MRA. Conclusion: For evaluation of intracranial aneurysms at 3 T, 3D CE-MRA is superior to 3D TOF-MRA

  18. Breath-hold gadolinium-enhanced MRA : clinical application

    International Nuclear Information System (INIS)

    Kang, Sung Gwon; Kang, Ji Hee; Kim, Won Hong; Lim, Myung Kwan; Cho, Young Kook; Cho, Soon Gu; Suh, Chang Hae

    1998-01-01

    The purpose of this study is to compare breath-hold gadolinium enhanced MR angiography (MRA) with digital subtraction angiography. Ten patients underwent angiography and breath-hold gadolinium enhanced MRA; the latter performed at 1.5T with 3D FSPGR after a bolus injection of gadopentetate dimeglumine (0.4m mol/kg). Seven of ten pathologic conditions (70%) evaluated by both techniques had a similar appearance. The conditions examined were as follows: the artery feeding renal cell carcinoma(n=2); renal artery stenosis (n=2); pulmonary AVM(n=2); abdominal aortic aneurysm (n=1); atheromatous plaque in the lower abdominal aorta (n=1); an enlarged bronchial artery (n=1); and an aberrant renal artery (n=1). For evaluating an anatomic relationship, a reconstructed 3D image obtained by MRA is more advantageous. Breath hold contrast enhanced MRA is a potentially useful noninvasive screening method for detecting vascular abnormality of the aorta and its branches. (author). 13 refs., 1 tab., 4 figs

  19. Breath-hold gadolinium-enhanced MRA : clinical application

    Energy Technology Data Exchange (ETDEWEB)

    Kang, Sung Gwon; Kang, Ji Hee; Kim, Won Hong; Lim, Myung Kwan; Cho, Young Kook; Cho, Soon Gu; Suh, Chang Hae [Inha University Hospital, Inchon (Korea, Republic of)

    1998-05-01

    The purpose of this study is to compare breath-hold gadolinium enhanced MR angiography (MRA) with digital subtraction angiography. Ten patients underwent angiography and breath-hold gadolinium enhanced MRA; the latter performed at 1.5T with 3D FSPGR after a bolus injection of gadopentetate dimeglumine (0.4m mol/kg). Seven of ten pathologic conditions (70%) evaluated by both techniques had a similar appearance. The conditions examined were as follows: the artery feeding renal cell carcinoma(n=2); renal artery stenosis (n=2); pulmonary AVM(n=2); abdominal aortic aneurysm (n=1); atheromatous plaque in the lower abdominal aorta (n=1); an enlarged bronchial artery (n=1); and an aberrant renal artery (n=1). For evaluating an anatomic relationship, a reconstructed 3D image obtained by MRA is more advantageous. Breath hold contrast enhanced MRA is a potentially useful noninvasive screening method for detecting vascular abnormality of the aorta and its branches. (author). 13 refs., 1 tab., 4 figs.

  20. [Aleksandr Lwowicz Blok (1852 - 1909)--character-sketch of the man and scientist].

    Science.gov (United States)

    Schiller, Joanna

    2009-01-01

    The article is an attempt of a new outlook first of all upon scientific output of many years' (the years 1878 - 1909) lecturer on Russian State Law in the Imperial University of Warsaw--Aleksandr Lwowicz Błok. Historians of literature, researchers of life and output of the scientist's son, an eminent poet-symbolist Aleksandr A. Błok, to a high degree were able to reconstruct lot of life and vicissitudes of the Warsaw professor. Thanks to the preserved university archival materials it was possible to add many details to Błok's biography, especially concerning his professional problems. They were connected with dramatic events in personal life of the professor. According to relations of the part of his university co-workers and students, the circumstances even brought about the symptoms of the mental illness. Prematurely elderly he was a man deeply miserable, lonely and deprived of understanding by associates. Up till now his scientific output has not been described precisely enough. Not numerous memories of his contemporaries (Szymon Askenazy, Nikołaj Dubrowskij) and even inconspicuous modern researches of the Polish (Janusz Woliński) brought about, in the author's opinion, too simplified and schematic character-sketch of Błok as a Russificator and nationalist, mediocre scholar and much worse lecturer. A scientific output of Błok is, indeed, inostensible--he published 2 books only--Master's thesis entitled: Władza państwowa w społeczeństwie europejskim. Poglad na polityczna teorie Lorenza Steina i na francuska rzeczywistość polityczna (1880) [State Authority in European Society. Outlook upon Political Theory of Lorenz Stein and French Political Facts (1880)] and Literatura polityczna w Rosj i o Rosji (1884) [Political Literature in Russia and on Russia (1884)] as an introduction to his course in State Law. Two thirds, so over 20 years of work, he gave to the not accomplished conception of creating a new classification of sciences that together with its

  1. Contrast-enhanced time-resolved 4D MRA of congenital heart and vessel anomalies: image quality and diagnostic value compared with 3D MRA

    Energy Technology Data Exchange (ETDEWEB)

    Vogt, Florian M.; Hunold, Peter; Barkhausen, Joerg [University Hospital Schleswig-Holstein, Clinic for Radiology and Nuclear Medicine, Luebeck (Germany); Theysohn, Jens M.; Kinner, Sonja [University Hospital Essen, Department of Diagnostic and Interventional Radiology and Neuroradiology, Essen (Germany); Michna, Dariusz [Elisabeth Hospital, Department of Neonatology, Essen (Germany); Neudorf, Ulrich [University Hospital Essen, Clinic for Pediatrics III, Essen (Germany); Quick, Harald H. [University of Erlangen-Nuernberg, Institute of Medical Physics, Erlangen (Germany)

    2013-09-15

    To evaluate time-resolved interleaved stochastic trajectories (TWIST) contrast-enhanced 4D magnetic resonance angiography (MRA) and compare it with 3D FLASH MRA in patients with congenital heart and vessel anomalies. Twenty-six patients with congenital heart and vessel anomalies underwent contrast-enhanced MRA with both 3D FLASH and 4D TWIST MRA. Images were subjectively evaluated regarding total image quality, artefacts, diagnostic value and added diagnostic value of 4D dynamic imaging. Quantitative comparison included signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR) and vessel sharpness measurements. Three-dimensional FLASH MRA was judged to be significantly better in terms of image quality (4.0 {+-} 0.6 vs 3.4 {+-} 0.6, P < 0.05) and artefacts (3.8 {+-} 0.4 vs 3.3 {+-} 0.5, P < 0.05); no difference in diagnostic value was found (4.2 {+-} 0.4 vs 4.0 {+-} 0.4); important additional functional information was found in 21/26 patients. SNR and CNR were higher in the pulmonary trunk in 4D TWIST, but slightly higher in the systemic arteries in 3D FLASH. No difference in vessel sharpness delineation was found. Although image quality was inferior compared with 3D FLASH MRA, 4D TWIST MRA yields robust images and added diagnostic value through dynamic acquisition was found. Thus, 4D TWIST MRA is an attractive alternative to 3D FLASH MRA. (orig.)

  2. Combination of functional MRI with SAS and MRA

    Energy Technology Data Exchange (ETDEWEB)

    Sumida, Masayuki; Takeshita, Shinichirou; Kutsuna, Munenori; Akimitsu, Tomohide; Arita, Kazunori; Kurisu, Kaoru [Hiroshima Univ. (Japan). School of Medicine

    1999-02-01

    For presurgical diagnosis of brain surface, combination of functional MRI (fMRI) with the MR angiography was examined. This method could visualize brain bay, convolution and vein as index of surface. Five normal adults (male, mean age: 28-year-old) and 7 patients with brain tumor on the main locus to surface (male: 4, female: 3, mean age: 52.3-year-old) were studied. fMRI was performed by SPGR method (TR 70, TE 40, flip angle 60, one slice, thickness 10 mm, FOV 20 cm, matrix 128 x 128). The brain surface was visualized by SAS (surface anatomy scanning). SAS was performed by FSE method (TR 6000, TE 200, echo train 16, thickness 20 mm, slice 3, NEX 2). Cortical veins near superior sagittal sinus were visualized by MRA with 2D-TOF method (TR 50, TE 20, flip angle 60, thickness 2 mm, slice 28, NEX 1). These images were superimposed and functional image of peripheral sensorimotor region was evaluated anatomically. In normal adults, high signal was visualized at another side of near sensorimotor region at 8 of 10 sides. All high signal area of fMRI agreed with cortical vein near sensorimotor region that was visualized by MRA. In patients with brain tumor, signal was visualized at another side of sensorimotor region of tumor without 2 cases with palsy. In another side of tumor, signal of fMRI was visualized in 5 of 7 cases. The tumor was visualized as opposite low signal field in SAS. Locational relation between tumor and brain surface and brain function was visualized distinctly by combination of MRA, SAS and MRA. This method could become useful for presurgical diagnosis. (K.H.)

  3. Image postprocessing of aortic CTA and MRA; Aktuelle Bildnachverarbeitung der aortalen CTA und MRA

    Energy Technology Data Exchange (ETDEWEB)

    Tengg-Kobligk, H. von; Weber, T.F.; Rengier, F.; Kauczor, H.U. [Deutsches Krebsforschungszentrum (DKFZ), Abteilung Radiologie E010, Heidelberg (Germany); Boeckler, D. [Ruprecht-Karls-Universitaet Heidelberg, Klinik fuer Gefaesschirurgie, vaskulaere und endovaskulaere Chrirurgie, Heidelberg (Germany); Schumacher, H. [Klinikum der Stadt Hanau, Klinik fuer Gefaesschirurgie, Hanau (Germany)

    2007-11-15

    Multiplanar reformation (MPR) is the most relevant tool for patient selection and precise procedural planning and also for analyzing postinterventional complications. Curved MPR is used primarily for semiautomated or completely automated calculation of the centerline of the vascular lumen and to estimate the orthogonal vessel diameter and longitudinal extent. Reproducible and accurate measurement of complex pathologies and courses of vessels extends the range of diagnostic radiology. Contemporary scanner consoles allow automated processing of maximum intensity projections (MIP) and standard MPR and their storage in PACS. To improve patient selection, procedural planning, root-cause analysis postoperatively for assessment of treatment effects and to make better communication of findings to nonradiologists possible, volume rendering techniques (VRT) are a beneficial adjunct to source images. With current algorithms semiautomated segmentation is satisfactory for vessels and bones, but not for low-contrast structures (soft tissues), which still need to be segmented manually. In general, isotropic CT source data are preferable to MR images, which are often anisotropic. In many European countries image postprocessing is still not adequately reimbursed although the doctors making referrals often specifically and emphatically demand 3D visualization and measurements in daily practice. (orig.) [German] Die multiplanare Reformatierung (MPR) der Bilddaten aortaler CTA und MRA ist die wichtigste Rekonstruktionsmethode im Hinblick auf eine differenzierte Therapieentscheidung und die praeoperative Therapieplanung sowie die Beschreibung postoperativer Komplikationen. Die gekruemmte MPR wird semiautomatisch bzw. vollstaendig automatisch als Centerline im Gefaesslumen berechnet und fuer die Bestimmung des orthogonalen Durchmessers und der Laengsausdehnung der Pathologie verwendet. Eine reproduzierbar exakte Ausmessung komplexer Pathologien und Gefaesslaengsverlaeufe erweitert das

  4. Pronkssõduri teisaldamise ainsaks eelduseks on referendum / Kalev Rebane, Roman Zharov, Aleksandr Korobov...[jt.] ; interv. Peeter Ernits, Jüri Aarma, Annika Poldre

    Index Scriptorium Estoniae

    2006-01-01

    Oma seisukohtadest Tallinnas Tõnismäel asuva Teise maailmasõja mälestusmärgi suhtes räägivad isamaaliitlane Kalev Rebane ja vene noorteühenduse Notshnoi Dozor juhid Roman Zharov, Aleksandr Korobov, Oleg Filippov ja Igor Rogo

  5. An investigation of cerebral magnetic resonance angiography (MRA). Part 8: diagnostic ability of cerebral aneurysms with MRA using 1.5 T MRI

    International Nuclear Information System (INIS)

    Ohue, Shiro; Kusunoki, Katsusuke; Kohno, Kanehisa

    1998-01-01

    The ability of MR angiography (MRA) to detect intracranial aneurysms was assessed. Seventy-eight patients, including 21 cases of intracranial aneurysms, underwent three-dimensional time-of-flight (3D TOF) MRA using a 1.5 T MRI system. MRA images were evaluated using maximum intensity projection (MIP) images only, MIP+selective MIP images, and MIP+selective MIP+original images by ten neurosurgeons and neuroradiologists. By receiver operating characteristic (ROC) analysis of the ability to detect the 21 patients with aneurysms, the sensitivity of MIP images was 74±8% (mean±S.D.) while the specificity was 80%. Of 26 aneurysms, the sensitivity of MIP images was 64±9% (mean±S.D.). Although the sensitivity for aneurysms 5 mm or larger, or located at middle cerebral arteries was over 85%, the sensitivity for aneurysms smaller than 5 mm or located at internal carotid arteries was less than 50%. The evaluation of MRA adding selective MIP and original images to MIP images improved the sensitivity in detecting aneurysms and decreased the number of false positive cases. These data indicate that MRA is a useful technique for detecting aneurysms 5 mm or larger, and those located at the middle cerebral arteries. However, by MRA, it remains difficult to detect aneurysms smaller than 5 mm and those located at the internal carotid arteries. (author)

  6. Preoperative imaging in 78 living kidney donors using CE-MRA and DSA; Donor-Evaluation vor Lebendnierenspende: Vergleich von CE-MRA und DSA an 78 Patienten

    Energy Technology Data Exchange (ETDEWEB)

    Lemke, U.; Taupitz, M.; Hamm, B.; Kroencke, T.J. [Inst. fuer Radiologie, Charite - Universitaetsmedizin Berlin (Germany); Kluener, C. [Inst. fuer Radiologie und Neuroradiologie, Evangelisches Krankenhaus Oldenburg (Germany); Giessing, M.; Schoenberger, B. [Urologische Klinik und Poliklinik, Charite - Universitaetsmedizin Berlin (Germany)

    2008-01-15

    Purpose: to evaluate contrast-enhanced 3D magnetic resonance angiography (CE-MRA) and digital subtraction angiography (DSA) in comparison with the intraoperative findings in living kidney donors. Materials and methods: a total of 156 kidneys in 78 potential kidney donors were prospectively examined using CE-MRA (0.2 mmol Gd/kg, voxel size 1.3 x 0.8 x 2.0) and DSA. Two experienced radiologists assessed the images in consensus regarding the renal vascular anatomy and variants. The results for the 67 candidates accepted for donation were compared to the intraoperative findings. In the other kidneys not accepted for donor nephrectomy, MRA and DSA were compared with each other. Results: nineteen arterial variants were identified intraoperatively, of which 11 (58%) were also detected by preoperative CE-MRA and 10 (53%) by preoperative DSA. Of the 10 venous variants found intraoperatively, CE-MRA detected 8 (80%) and DSA 3 (30%). The agreement (kappa test) between MRI and DSA for all 156 evaluated kidneys was 0.7 for arterial variants (McNemar p = 0.12) and 0.3 for venous variants (McNemar p = 0.01). The preoperative choice of kidney (right or left) made on the basis of the renal vascular anatomy seen on CE-MRA and DSA differed in 22% of the 78 potential donors (McNemar P = 0.3). (orig.)

  7. Comparison of remnant size in embolized intracranial aneurysms measured at follow-up with DSA and MRA

    Energy Technology Data Exchange (ETDEWEB)

    Serafin, Zbigniew; Strzesniewski, Piotr; Lasek, Wladyslaw [Nicolaus Copernicus University, Department of Radiology and Diagnostic Imaging, Collegium Medicum, Bydgoszcz (Poland); Beuth, Wojciech [University of Humanities and Economics in Wloclawek, Faculty of Health Sciences, Wloclawek (Poland)

    2012-12-15

    The possibility of recanalization and the need for retreatment are the most important limitations of intracranial aneurysm embolization. The purpose of the study was to compare the size of aneurysm remnants measured at follow-up with three-dimensional digital subtracted angiography (3D-DSA) and magnetic resonance angiography (MRA). Twenty-six aneurysms were found incompletely occluded in 72 consecutively examined patients at a follow-up after 3 months. The diameters and volume of aneurysm remnants were compared between 3D-DSA, time-of-flight MRA (TOF-MRA), contrast-enhanced TOF-MRA (CE-TOF-MRA), and contrast-enhanced MRA (CE-MRA) at 1.5 T. There was a significant correlation between remnant volumes calculated based on 3D-DSA and all MRA modalities. The intraobserver variability of the measurements ranged from 3.4 to 4.1 % and the interobserver variability from 5.8 to 7.3 %. There were no significant differences in the variability between the techniques. The mean residual filling volume ranged from 16.3 {+-} 19.0 mm{sup 3} in TOF-MRA to 30.5 {+-} 44.6 mm{sup 3} in 3D-DSA (P < 0.04). Significant differences were found in the volumes measured with 3D-DSA and CE-MRA as compared to TOF-MRA and CE-TOF-MRA (P < 0.01). There was a moderate significant correlation between the residual filling and the relative error of measurement in the case of TOF-MRA and CE-TOF-MRA. TOF-MRA seems to underestimate the size of aneurysm remnants detected at follow-up and should not be used as a sole imaging method to decide on re-embolization. (orig.)

  8. Comparison of remnant size in embolized intracranial aneurysms measured at follow-up with DSA and MRA

    International Nuclear Information System (INIS)

    Serafin, Zbigniew; Strzesniewski, Piotr; Lasek, Wladyslaw; Beuth, Wojciech

    2012-01-01

    The possibility of recanalization and the need for retreatment are the most important limitations of intracranial aneurysm embolization. The purpose of the study was to compare the size of aneurysm remnants measured at follow-up with three-dimensional digital subtracted angiography (3D-DSA) and magnetic resonance angiography (MRA). Twenty-six aneurysms were found incompletely occluded in 72 consecutively examined patients at a follow-up after 3 months. The diameters and volume of aneurysm remnants were compared between 3D-DSA, time-of-flight MRA (TOF-MRA), contrast-enhanced TOF-MRA (CE-TOF-MRA), and contrast-enhanced MRA (CE-MRA) at 1.5 T. There was a significant correlation between remnant volumes calculated based on 3D-DSA and all MRA modalities. The intraobserver variability of the measurements ranged from 3.4 to 4.1 % and the interobserver variability from 5.8 to 7.3 %. There were no significant differences in the variability between the techniques. The mean residual filling volume ranged from 16.3 ± 19.0 mm 3 in TOF-MRA to 30.5 ± 44.6 mm 3 in 3D-DSA (P < 0.04). Significant differences were found in the volumes measured with 3D-DSA and CE-MRA as compared to TOF-MRA and CE-TOF-MRA (P < 0.01). There was a moderate significant correlation between the residual filling and the relative error of measurement in the case of TOF-MRA and CE-TOF-MRA. TOF-MRA seems to underestimate the size of aneurysm remnants detected at follow-up and should not be used as a sole imaging method to decide on re-embolization. (orig.)

  9. Comparison of remnant size in embolized intracranial aneurysms measured at follow-up with DSA and MRA.

    Science.gov (United States)

    Serafin, Zbigniew; Strześniewski, Piotr; Lasek, Władysław; Beuth, Wojciech

    2012-12-01

    The possibility of recanalization and the need for retreatment are the most important limitations of intracranial aneurysm embolization. The purpose of the study was to compare the size of aneurysm remnants measured at follow-up with three-dimensional digital subtracted angiography (3D-DSA) and magnetic resonance angiography (MRA). Twenty-six aneurysms were found incompletely occluded in 72 consecutively examined patients at a follow-up after 3 months. The diameters and volume of aneurysm remnants were compared between 3D-DSA, time-of-flight MRA (TOF-MRA), contrast-enhanced TOF-MRA (CE-TOF-MRA), and contrast-enhanced MRA (CE-MRA) at 1.5 T. There was a significant correlation between remnant volumes calculated based on 3D-DSA and all MRA modalities. The intraobserver variability of the measurements ranged from 3.4 to 4.1 % and the interobserver variability from 5.8 to 7.3 %. There were no significant differences in the variability between the techniques. The mean residual filling volume ranged from 16.3 ± 19.0 mm(3) in TOF-MRA to 30.5 ± 44.6 mm(3) in 3D-DSA (P < 0.04). Significant differences were found in the volumes measured with 3D-DSA and CE-MRA as compared to TOF-MRA and CE-TOF-MRA (P < 0.01). There was a moderate significant correlation between the residual filling and the relative error of measurement in the case of TOF-MRA and CE-TOF-MRA. TOF-MRA seems to underestimate the size of aneurysm remnants detected at follow-up and should not be used as a sole imaging method to decide on re-embolization.

  10. High-resolution motion compensated MRA in patients with congenital heart disease using extracellular contrast agent at 3 Tesla

    Directory of Open Access Journals (Sweden)

    Dabir Darius

    2012-10-01

    Full Text Available Abstract Background Using first-pass MRA (FP-MRA spatial resolution is limited by breath-hold duration. In addition, image quality may be hampered by respiratory and cardiac motion artefacts. In order to overcome these limitations an ECG- and navigator-gated high-resolution-MRA sequence (HR-MRA with slow infusion of extracellular contrast agent was implemented at 3 Tesla for the assessment of congenital heart disease and compared to standard first-pass-MRA (FP-MRA. Methods 34 patients (median age: 13 years with congenital heart disease (CHD were prospectively examined on a 3 Tesla system. The CMR-protocol comprised functional imaging, FP- and HR-MRA, and viability imaging. After the acquisition of the FP-MRA sequence using a single dose of extracellular contrast agent the motion compensated HR-MRA sequence with isotropic resolution was acquired while injecting the second single dose, utilizing the timeframe before viability imaging. Qualitative scores for image quality (two independent reviewers as well as quantitative measurements of vessel sharpness and relative contrast were compared using the Wilcoxon signed-rank test. Quantitative measurements of vessel diameters were compared using the Bland-Altman test. Results The mean image quality score revealed significantly better image quality of the HR-MRA sequence compared to the FP-MRA sequence in all vessels of interest (ascending aorta (AA, left pulmonary artery (LPA, left superior pulmonary vein (LSPV, coronary sinus (CS, and coronary ostia (CO; all p  Conclusions An ECG- and navigator-gated HR-MRA-protocol with infusion of extracellular contrast agent at 3 Tesla is feasible. HR-MRA delivers significantly better image quality and vessel sharpness compared to FP-MRA. It may be integrated into a standard CMR-protocol for patients with CHD without the need for additional contrast agent injection and without any additional examination time.

  11. Noncontrast MR angiography (MRA) of infragenual arteries using flow-sensitive dephasing (FSD)-prepared steady-state free precession (SSFP) at 3.0 Tesla: Comparison with contrast-enhanced MRA.

    Science.gov (United States)

    Zhang, Nan; Fan, Zhaoyang; Luo, Nan; Bi, Xiaoming; Zhao, Yike; An, Jing; Liu, Jiayi; Chen, Zhong; Fan, Zhanming; Li, Debiao

    2016-02-01

    To evaluate the feasibility and diagnostic performance of flow-sensitive dephasing (FSD)-prepared steady-state free precession (SSFP) MR angiography (MRA) for imaging infragenual arteries at 3.0T, with contrast enhanced MR angiography (CE MRA) as reference. Twenty consecutive patients with suspicion of lower extremity arterial disease undergoing routine CE MRA were recruited. FSD MRA was performed at calf before CE MRA. Image quality and stenosis degree of infragenual arteries from both techniques were independently evaluated and compared. Six patients in this study underwent DSA examination. Three undiagnostic segments were excluded with severe venous contamination in CE MRA. A total of 197 calf arterial segments images were analyzed. No significant difference existed in the relative signal intensity (rSI) of arterial segments between FSD MRA and CE MRA techniques (0.92 ± 0.09 versus 0.93 ± 0.05; P = 0.207). However, the subjective image quality score was slightly higher in FSD MRA (3.66 ± 0.81 versus 3.49 ± 0.87; P = 0.050). With CE MRA images as reference standard, slight overestimation existed in FSD MRA (2.19 ± 1.24 versus 2.09 ± 1.18; P = 0.019), with total agreement of 84.3% on the basis of all arterial segments. The sensitivity, specificity, negative predictive value, and positive predictive value of FSD MRA was 96.4%, 93.0%, 98.5%, and 84.1%. No significant difference in the stenosis degree score was detected between MRA (FSD MRA and CE MRA) and DSA (P > 0.05). FSD MRA performed on at 3.0T without the use of contrast medium provides diagnostic images allowing for arterial stenosis assessment of calf arteries that was highly comparable with CE MRA. Moreover, venous contamination was less problematic with FSD MRA. © 2015 Wiley Periodicals, Inc.

  12. Vessel diameter measurements in gadolinium contrast-enhanced three-dimensional MRA of peripheral arteries

    NARCIS (Netherlands)

    Westenberg, J.J.M.; Geest, van der R.J.; Wasser, M.N.J.M.; Linden, van der E.L.; Walsum, van T.; Assen, van H.C.; Roos, de A.; Vanderschoot, J.; Reiber, J.H.C.

    2000-01-01

    In this study, the possibilities for quantification of vessel diameters of peripheral arteries in gadolinium contrast-enhanced magnetic resonance angiography (Gd CE MRA) were evaluated. Absolute vessel diameter measurements were assessed objectively and semi-automatically in maximum intensity

  13. Internal carotid artery stenosis or occlusion: study of collateral circulation pathways on DSA and MRA

    International Nuclear Information System (INIS)

    Zhao Yunhui; Ma Zhubin; Xu Yikai

    2004-01-01

    Objectives: To evaluate the collateral pathways of internal carotid artery (ICA) stenosis or occlusion on digital subtraction angiography (DSA) and magnetic resonance angiography (MRA), and to compare these two methods in the study for collateral pathways. Methods: Seventy-four patients with ICA stenosis or occlusion were included as the study group. Sixty persons with normal findings on DSA or MRA each served as the control group. DSA, MRA, MRI, CT findings, and clinicall materials were analyzed in the two groups. Results: Stenosis or occlusion over ICA bifurcation was showed clearly in all patients on DSA or MRA. On DSA, the presence rate of ipsilateral posterior communicating artery (PCoA) in the study group (82.5%) was lower significantly than that of the control group (94.2%) (P=0.025). On MRA (3D-TOF), the rate in the study group (59.3%) was higher significantly than that of the controls (30.0%) (P=0.000). On DSA and MRA, the diameter of ipsilateral PCoA in the study group was larger than that of the control group (P=0.000). On DSA, the presence rate of OPhA in the study group was significantly different from that of the control group, and its diameter was larger than that of the control group (P=0.003). On MRA, its presence rate was lower than that of the control group. The presence rate of anterior communicating artery (ACoA) in the study group showed no statistical difference between DSA and MRA. In the study group, the presence rate of PCoA on DSA was significantly higher than that on MRA (P 0.05). The diameters of the three arteries showed no significant differences between DSA and MRA (P>0.05). Conclusion: DSA is highly valuable for the evaluation of collateral pathways of ICA stenosis or occlusion, and it is necessary for preoperative examination. MRA is a non-invasive angiographic method and can evaluate collateral circulation in both morphology and function, and can be the preferred method for the disease. (authors)

  14. Usefulness of enhanced breathhold 3D spoiled gradient-echo MRA for intrathoracic mass

    International Nuclear Information System (INIS)

    Kobayashi, Takeshi; Kadoya, Masumi; Kamimura, Ryoichi; Takashima, Tsutomu

    1999-01-01

    Enhanced Breathhold 3D Spoiled Gradient-echo MRA was very attractive method for not only evaluating relationship between intrathoracic mass and intrathoracic vessels, but also visualizing small pulmonary vessels that could not be detected conventional MRA methods. Moreover, this methods could be applied for evaluating vascularity of the lesions. This method will be accepted as routine pulse sequence for evaluating intrathoracic mass especially malignant tumors. (author)

  15. MraZ from Escherichia coli: cloning, purification, crystallization and preliminary X-ray analysis

    Energy Technology Data Exchange (ETDEWEB)

    Adams, Melanie A.; Udell, Christian M.; Pal, Gour Pada; Jia, Zongchao, E-mail: jia@post.queensu.ca [Department of Biochemistry, Queen’s University, Kingston, Ontario K7L 3N6 (Canada)

    2005-04-01

    The crystallization and preliminary X-ray diffraction analysis of MraZ, formerly known as hypothetical protein YabB, from Escherichia coli K-12 is presented. The MraZ family of proteins, also referred to as the UPF0040 family, are highly conserved in bacteria and are thought to play a role in cell-wall biosynthesis and cell division. The murein region A (mra) gene cluster encodes MraZ proteins along with a number of other proteins involved in this complex process. To date, there has been no clear functional assignment provided for MraZ proteins and the structure of a homologue from Mycoplasma pneumoniae, MPN314, failed to suggest a molecular function. The b0081 gene from Escherichia coli that encodes the MraZ protein was cloned and the protein was overexpressed, purified and crystallized. This data is presented along with evidence that the E. coli homologue exists in a different oligomeric state to the MPN314 protein.

  16. MraZ from Escherichia coli: cloning, purification, crystallization and preliminary X-ray analysis

    International Nuclear Information System (INIS)

    Adams, Melanie A.; Udell, Christian M.; Pal, Gour Pada; Jia, Zongchao

    2005-01-01

    The crystallization and preliminary X-ray diffraction analysis of MraZ, formerly known as hypothetical protein YabB, from Escherichia coli K-12 is presented. The MraZ family of proteins, also referred to as the UPF0040 family, are highly conserved in bacteria and are thought to play a role in cell-wall biosynthesis and cell division. The murein region A (mra) gene cluster encodes MraZ proteins along with a number of other proteins involved in this complex process. To date, there has been no clear functional assignment provided for MraZ proteins and the structure of a homologue from Mycoplasma pneumoniae, MPN314, failed to suggest a molecular function. The b0081 gene from Escherichia coli that encodes the MraZ protein was cloned and the protein was overexpressed, purified and crystallized. This data is presented along with evidence that the E. coli homologue exists in a different oligomeric state to the MPN314 protein

  17. Collateral vessels in moyamoya disease : comparison of MR and MRA with conventional angiography

    International Nuclear Information System (INIS)

    Shim, Joo Eun; Yoon, Dae Young; Yi, Jeong Geun; Kim, Ho Chul; Choi, Chul Sun; Bae, Sang Hoon

    1998-01-01

    To determine the value of magnetic resonance imaging (MR) and magnetic resonance angiography (MRA) in assessing collateral vessels of moyamoya disease. Twenty-four patients with moyamoya disease who underwent MR, 3D TOF MRA, and conventional angiography participated in this study. Two radiologists working independently and with no knowledge of the angiographic findings, interpreted the MR and MRA images. To determine the presence of parenchymal and leptomeningeal collaterals (48 hemispheres) and transdural collaterals (38 hemispheres in 19 patients were depicted by angiography of the external carotid), the findings were compared with those of angiography. Parenchymal, leptomeningeal, and transdural collaterals were depicted by conventional angiography in 34 (71%), 32 (67%), and 11 (29%) hemispheres respectively. The sensitivity and specificity of MR/MRA for collateral vessels were 79.1/88.1 % for parenchymal collaterals, 72.1/88.1 % for leptomeningeal collaterals, and 0.1/18.1 % for transdural collaterals, respectively. Respective sensitivity and specificity of MR/MRA were 88.94/94.1% for leptomeningeal collaterals, and 18.93/55.1 % for transdural collaterals, when the prominent posterior cerebral and external carotid artery were regarded as secondary signs of leptomeningeal and transdural collateral vessels. In moyamoya disease, MR and MRA are useful imaging modalities for the assessment of collateral vessels. The prominent posterior cerebral artery and external carotid artery can be useful secondary signs of leptomeningeal and transdural collateral vessels. (author). 18 refs., 2 figs

  18. Validation of a standardized mapping system of the hip joint for radial MRA sequencing

    International Nuclear Information System (INIS)

    Klenke, Frank M.; Hoffmann, Daniel B.; Cross, Brian J.; Siebenrock, Klaus A.

    2015-01-01

    Intraarticular gadolinium-enhanced magnetic resonance arthrography (MRA) is commonly applied to characterize morphological disorders of the hip. However, the reproducibility of retrieving anatomic landmarks on MRA scans and their correlation with intraarticular pathologies is unknown. A precise mapping system for the exact localization of hip pathomorphologies with radial MRA sequences is lacking. Therefore, the purpose of the study was the establishment and validation of a reproducible mapping system for radial sequences of hip MRA. Sixty-nine consecutive intraarticular gadolinium-enhanced hip MRAs were evaluated. Radial sequencing consisted of 14 cuts orientated along the axis of the femoral neck. Three orthopedic surgeons read the radial sequences independently. Each MRI was read twice with a minimum interval of 7 days from the first reading. The intra- and inter-observer reliability of the mapping procedure was determined. A clockwise system for hip MRA was established. The teardrop figure served to determine the 6 o'clock position of the acetabulum; the center of the greater trochanter served to determine the 12 o'clock position of the femoral head-neck junction. The intra- and inter-observer ICCs to retrieve the correct 6/12 o'clock positions were 0.906-0.996 and 0.978-0.988, respectively. The established mapping system for radial sequences of hip joint MRA is reproducible and easy to perform. (orig.)

  19. CT, MRI and MRA of cerebrovascular malformations (report of 16 cases)

    International Nuclear Information System (INIS)

    Ding Qingguo; Hu Chunhong; Guo Liang; Ding Yi

    2000-01-01

    Objective: To evaluate the value of CT, MRI and MRA in cerebrovascular malformations. Methods: 16 cases of cerebrovascular malformations were confirmed by angiography and pathology, including 12 cases of arteriovenous malformations, 4 cases of cavernous angiomas. All of these cases were performed with CT, MRI non-contrast scan and 3D-TOF MRA. Results: CT appearances of AVM were mixed density with hypo-density, iso-density or hyper-density. Some had calcification or acute hemorrhage. MRI scan showed the dilated and tortuous nidus of AVMs on T 1 WI and T 2 WI. The appearances of hemorrhage were variable. Feeding arteries and draining veins were showed clearly on MRA. The typical sign of cavernous angiomas was mixed signals with hypointensity ring on MRI, while MRA could not provide much information. Conclusions: CT, MRI and MRA had different value in diagnosis of cerebrovascular malformations. CT combined with MRI and MRA could sharply improve the accuracy of diagnosis, and aid in the comprehensive evaluation of cerebrovascular malformations

  20. Preoperative imaging in 78 living kidney donors using CE-MRA and DSA

    International Nuclear Information System (INIS)

    Lemke, U.; Taupitz, M.; Hamm, B.; Kroencke, T.J.; Kluener, C.; Giessing, M.; Schoenberger, B.

    2008-01-01

    Purpose: to evaluate contrast-enhanced 3D magnetic resonance angiography (CE-MRA) and digital subtraction angiography (DSA) in comparison with the intraoperative findings in living kidney donors. Materials and methods: a total of 156 kidneys in 78 potential kidney donors were prospectively examined using CE-MRA (0.2 mmol Gd/kg, voxel size 1.3 x 0.8 x 2.0) and DSA. Two experienced radiologists assessed the images in consensus regarding the renal vascular anatomy and variants. The results for the 67 candidates accepted for donation were compared to the intraoperative findings. In the other kidneys not accepted for donor nephrectomy, MRA and DSA were compared with each other. Results: nineteen arterial variants were identified intraoperatively, of which 11 (58%) were also detected by preoperative CE-MRA and 10 (53%) by preoperative DSA. Of the 10 venous variants found intraoperatively, CE-MRA detected 8 (80%) and DSA 3 (30%). The agreement (kappa test) between MRI and DSA for all 156 evaluated kidneys was 0.7 for arterial variants (McNemar p = 0.12) and 0.3 for venous variants (McNemar p = 0.01). The preoperative choice of kidney (right or left) made on the basis of the renal vascular anatomy seen on CE-MRA and DSA differed in 22% of the 78 potential donors (McNemar P = 0.3). (orig.)

  1. Automated diagnosis of rolling bearings using MRA and neural networks

    Science.gov (United States)

    Castejón, C.; Lara, O.; García-Prada, J. C.

    2010-01-01

    Any industry needs an efficient predictive plan in order to optimize the management of resources and improve the economy of the plant by reducing unnecessary costs and increasing the level of safety. A great percentage of breakdowns in productive processes are caused by bearings. They begin to deteriorate from early stages of their functional life, also called the incipient level. This manuscript develops an automated diagnosis of rolling bearings based on the analysis and classification of signature vibrations. The novelty of this work is the application of the methodology proposed for data collected from a quasi-real industrial machine, where rolling bearings support the radial and axial loads the bearings are designed for. Multiresolution analysis (MRA) is used in a first stage in order to extract the most interesting features from signals. Features will be used in a second stage as inputs of a supervised neural network (NN) for classification purposes. Experimental results carried out in a real system show the soundness of the method which detects four bearing conditions (normal, inner race fault, outer race fault and ball fault) in a very incipient stage.

  2. Diagnosis of glenoid labral tears using 3-tesla MRI vs. 3-tesla MRA: a systematic review and meta-analysis.

    Science.gov (United States)

    Ajuied, Adil; McGarvey, Ciaran P; Harb, Ziad; Smith, Christian C; Houghton, Russell P; Corbett, Steven A

    2018-05-01

    Various protocols exist for magnetic resonance arthrogram (MRA) of the shoulder, including 3D isotropic scanning and positioning in neutral (2D neutral MRA), or abduction-external-rotation (ABER). MRA does not improve diagnostic accuracy for labral tears when compared to magnetic resonance imaging (MRI) performed using 3-Tesla (3T) magnets. Systematic review of the Cochrane, MEDLINE, and PubMed databases according to PRISMA guidelines. Included studies compared 3T MRI or 3T MRA (index tests) to arthroscopic findings (reference test). Methodological appraisal performed using QUADAS-2. Pooled sensitivity and specificity were calculated. Ten studies including 929 patients were included. Index test bias and applicability were a concern in the majority of studies. The use of arthroscopy as the reference test raised concern of verification bias in all studies. For anterior labral lesions, 3T MRI was less sensitive (0.83 vs. 0.87 p = 0.083) than 3T 2D neutral MRA. Compared to 3T 2D neutral MRA, both 3T 3D Isotropic MRA and 3T ABER MRA significantly improved sensitivity (0.87 vs. 0.95 vs. 0.94). For SLAP lesions, 3T 2D neutral MRA was of similar sensitivity to 3T MRI (0.84 vs. 0.83, p = 0.575), but less specific (0.99 vs. 0.92 p < 0.0001). For posterior labral lesions, 3T 2D neutral MRA had greater sensitivity than 3T 3D Isotropic MRA and 3T MRI (0.90 vs. 0.83 vs. 0.83). At 3-T, MRA improved sensitivity for diagnosis of anterior and posterior labral lesions, but reduced specificity in diagnosis of SLAP tears. 3T MRA with ABER positioning further improved sensitivity in diagnosis of anterior labral tears. IV.

  3. Ruin philosophy, poetic discourse and the collapse of meta-narratives in Aleksandr Kushner's poetry of the 1970s

    Directory of Open Access Journals (Sweden)

    Andreas Schönle

    2017-10-01

    Full Text Available This article offers an analysis of the trope of ruin in the poetry of Aleksandr Kushner (born 1936, in particular through a close reading of two of his poems: “In a slippery graveyard, alone” and “Ruins”. The analysis of these poems is preceded by an overview of ruin philosophy from Burke and Diderot to Simmel and Benjamin, with particular emphasis on the way the trope of ruin contemplation stages a confrontation between the self and what transcends it (death, history, nature, etc.. This philosophical background serves as a heuristic tool to shed light on the poetry of Kushner. Through the trope of ruin, Kushner explores the legitimacy of poetic speech after the collapse of all meta-narratives. Kushner has no truck with Diderot's solipsism, nor with Hegel's bold narrative of progress, nor with Simmel's peaceful reconciliation with the creative forces of nature. Nor, really, does he intend to bear witness to history, the way Benjamin does in the faint anticipation of some miracle. Instead, Kushner posits the endurance of a community united not around a grand project, but around the idea of carrying on in the face of everything, muddling through despite the lack of hopes for a transformational future and making the most of fleeting moments of positivity that emerge out of the fundamental serendipity of history.

  4. Diagnosis of rotator cuff tears using 3-Tesla MRI versus 3-Tesla MRA: a systematic review and meta-analysis

    Energy Technology Data Exchange (ETDEWEB)

    McGarvey, Ciaran; Harb, Ziad; Smith, Christian; Ajuied, Adil [Guy' s and St Thomas' Hospital, King' s Health Partners, Department of Trauma and Orthopaedics, London (United Kingdom); Houghton, Russell [Guy' s and St Thomas' Hospital, King' s Health Partners, Department of Radiology, London (United Kingdom); Corbett, Steven [Guy' s and St Thomas' Hospital, King' s Health Partners, Department of Trauma and Orthopaedics, London (United Kingdom); Fortius Clinic, London (United Kingdom)

    2016-02-15

    To compare the diagnostic accuracy of magnetic resonance imaging (MRI), 2-dimensional magnetic resonance arthrogram (MRA) and 3-dimensional isotropic MRA in the diagnosis of rotator cuff tears when performed exclusively at 3-T. A systematic review was undertaken of the Cochrane, MEDLINE and PubMed databases in accordance with the PRISMA guidelines. Studies comparing 3-T MRI or 3-T MRA (index tests) to arthroscopic surgical findings (reference test) were included. Methodological appraisal was performed using QUADAS 2. Pooled sensitivity and specificity were calculated and summary receiver-operating curves generated. Kappa coefficients quantified inter-observer reliability. Fourteen studies comprising 1332 patients were identified for inclusion. Twelve studies were retrospective and there were concerns regarding index test bias and applicability in nine and six studies respectively. Reference test bias was a concern in all studies. Both 3-T MRI and 3-T MRA showed similar excellent diagnostic accuracy for full-thickness supraspinatus tears. Concerning partial-thickness supraspinatus tears, 3-T 2D MRA was significantly more sensitive (86.6 vs. 80.5 %, p = 0.014) but significantly less specific (95.2 vs. 100 %, p < 0.001). There was a trend towards greater accuracy in the diagnosis of subscapularis tears with 3-T MRA. Three-Tesla 3D isotropic MRA showed similar accuracy to 3-T conventional 2D MRA. Three-Tesla MRI appeared equivalent to 3-T MRA in the diagnosis of full- and partial-thickness tears, although there was a trend towards greater accuracy in the diagnosis of subscapularis tears with 3-T MRA. Three-Tesla 3D isotropic MRA appears equivalent to 3-T 2D MRA for all types of tears. (orig.)

  5. Diagnosis of rotator cuff tears using 3-Tesla MRI versus 3-Tesla MRA: a systematic review and meta-analysis

    International Nuclear Information System (INIS)

    McGarvey, Ciaran; Harb, Ziad; Smith, Christian; Ajuied, Adil; Houghton, Russell; Corbett, Steven

    2016-01-01

    To compare the diagnostic accuracy of magnetic resonance imaging (MRI), 2-dimensional magnetic resonance arthrogram (MRA) and 3-dimensional isotropic MRA in the diagnosis of rotator cuff tears when performed exclusively at 3-T. A systematic review was undertaken of the Cochrane, MEDLINE and PubMed databases in accordance with the PRISMA guidelines. Studies comparing 3-T MRI or 3-T MRA (index tests) to arthroscopic surgical findings (reference test) were included. Methodological appraisal was performed using QUADAS 2. Pooled sensitivity and specificity were calculated and summary receiver-operating curves generated. Kappa coefficients quantified inter-observer reliability. Fourteen studies comprising 1332 patients were identified for inclusion. Twelve studies were retrospective and there were concerns regarding index test bias and applicability in nine and six studies respectively. Reference test bias was a concern in all studies. Both 3-T MRI and 3-T MRA showed similar excellent diagnostic accuracy for full-thickness supraspinatus tears. Concerning partial-thickness supraspinatus tears, 3-T 2D MRA was significantly more sensitive (86.6 vs. 80.5 %, p = 0.014) but significantly less specific (95.2 vs. 100 %, p < 0.001). There was a trend towards greater accuracy in the diagnosis of subscapularis tears with 3-T MRA. Three-Tesla 3D isotropic MRA showed similar accuracy to 3-T conventional 2D MRA. Three-Tesla MRI appeared equivalent to 3-T MRA in the diagnosis of full- and partial-thickness tears, although there was a trend towards greater accuracy in the diagnosis of subscapularis tears with 3-T MRA. Three-Tesla 3D isotropic MRA appears equivalent to 3-T 2D MRA for all types of tears. (orig.)

  6. Concordance of Time-of-Flight MRA and Digital Subtraction Angiography in Adult Primary Central Nervous System Vasculitis.

    Science.gov (United States)

    de Boysson, H; Boulouis, G; Parienti, J-J; Touzé, E; Zuber, M; Arquizan, C; Dequatre, N; Detante, O; Bienvenu, B; Aouba, A; Guillevin, L; Pagnoux, C; Naggara, O

    2017-10-01

    3D-TOF-MRA and DSA are 2 available tools to demonstrate neurovascular involvement in primary central nervous system vasculitis. We aimed to compare the diagnostic concordance of vessel imaging using 3D-TOF-MRA and DSA in patients with primary central nervous system vasculitis. We retrospectively identified all patients included in the French primary central nervous system vasculitis cohort of 85 patients who underwent, at baseline, both intracranial 3D-TOF-MRA and DSA in an interval of no more than 2 weeks and before treatment initiation. Two neuroradiologists independently reviewed all 3D-TOF-MRA and DSA imaging. Brain vasculature was divided into 25 arterial segments. Concordance between 3D-TOF-MRA and DSA for the identification of arterial stenosis was assessed by the Cohen κ Index. Thirty-one patients met the inclusion criteria, including 20 imaged with a 1.5T MR unit and 11 with a 3T MR unit. Among the 25 patients (81%) with abnormal DSA findings, 24 demonstrated abnormal 3D-TOF-MRA findings, whereas all 6 remaining patients with normal DSA findings had normal 3D-TOF-MRA findings. In the per-segment analysis, concordance between 1.5T 3D-TOF-MRA and DSA was 0.82 (95% CI, 0.75-0.93), and between 3T 3D-TOF-MRA and DSA, it was 0.87 (95% CI, 0.78-0.91). 3D-TOF-MRA shows a high concordance with DSA in diagnostic performance when analyzing brain vasculature in patients with primary central nervous system vasculitis. In patients with negative 3T 3D-TOF-MRA findings, the added diagnostic value of DSA is limited. © 2017 by American Journal of Neuroradiology.

  7. Diagnosis of rotator cuff tears using 3-Tesla MRI versus 3-Tesla MRA: a systematic review and meta-analysis.

    Science.gov (United States)

    McGarvey, Ciaran; Harb, Ziad; Smith, Christian; Houghton, Russell; Corbett, Steven; Ajuied, Adil

    2016-02-01

    To compare the diagnostic accuracy of magnetic resonance imaging (MRI), 2-dimensional magnetic resonance arthrogram (MRA) and 3-dimensional isotropic MRA in the diagnosis of rotator cuff tears when performed exclusively at 3-T. A systematic review was undertaken of the Cochrane, MEDLINE and PubMed databases in accordance with the PRISMA guidelines. Studies comparing 3-T MRI or 3-T MRA (index tests) to arthroscopic surgical findings (reference test) were included. Methodological appraisal was performed using QUADAS 2. Pooled sensitivity and specificity were calculated and summary receiver-operating curves generated. Kappa coefficients quantified inter-observer reliability. Fourteen studies comprising 1332 patients were identified for inclusion. Twelve studies were retrospective and there were concerns regarding index test bias and applicability in nine and six studies respectively. Reference test bias was a concern in all studies. Both 3-T MRI and 3-T MRA showed similar excellent diagnostic accuracy for full-thickness supraspinatus tears. Concerning partial-thickness supraspinatus tears, 3-T 2D MRA was significantly more sensitive (86.6 vs. 80.5 %, p = 0.014) but significantly less specific (95.2 vs. 100 %, p Tesla 3D isotropic MRA showed similar accuracy to 3-T conventional 2D MRA. Three-Tesla MRI appeared equivalent to 3-T MRA in the diagnosis of full- and partial-thickness tears, although there was a trend towards greater accuracy in the diagnosis of subscapularis tears with 3-T MRA. Three-Tesla 3D isotropic MRA appears equivalent to 3-T 2D MRA for all types of tears.

  8. Indentification of inflow zone of cerebral aneurysm by MRA for effective coil embolization

    International Nuclear Information System (INIS)

    Kudo, Takumi; Satow, Tetsu; Yamada, Naoaki; Hyuga, Takanori; Miyamoto, Susumu; Murao, Kenichi

    2008-01-01

    It is important to pack the inflow zone of intracerebral aneurysm to prevent coil compaction or recanalization after coil embolization of the aneurysm. In this study, we report the usefulness of magnetic resonance angiography (MRA) to identify the inflow zone of the aneurysm. Between November 2004 and March 2006, 21 patients (IC paraclinoid, 11 cases; BA tip, 3 cases; A-com, 4 cases; IC-top, 2 cases; P1, 1 case) underwent interventional coil embolization for cerebral aneurysms and MRA was used to try to depict the inflow zone of the aneurysm. We designed a 3D time-of-flight MRA technique targeted to the aneurysm with a large flip angle to emphasize the streamline into the aneurysm. We grasped the position of the inflow zone in the aneurysm by MRA before intervention. The inflow zone was packed by coils tightly with balloon neck remodeling technique anchor catheter assist technique, if necessary. The inflow zone was depicted in all 21 cases by MRA. In sidewall type aneurysms, the inflow zone existed beside the distal neck in all cases. In terminal type aneurysms, the inflow zone existed on an extension line from patent artery. Dome filling was not detected in all cases after treatment. Small neck remnant was detected in 6 cases that slightly increased in 4 cases, vanished in 1 case, remained and unchanged in 1 case 6 months after treatment. None of the cases required additional treatment. For effective coil embolization, it is important to grasp the position of the inflow zone of the aneurysm and to pack the point as tightly as possible. Identification of the inflow zone of aneurysm by MRA is useful for coil embolization. (author)

  9. Usefulness of time-resolved projection MRA on evaluation of hemodynamics in cerebral occlusive diseases

    International Nuclear Information System (INIS)

    Oka, Yoshihisa; Kusunoki, Katsusuke; Nochide, Ichiro; Igase, Keiji; Harada, Hironobu; Sadamoto, Kazuhiko; Nagasawa, Kiyoshi

    2001-01-01

    The usefulness for evaluation of cerebral hemodynamics using time-resolved projection MRA was studied in normal volunteers and patients of cerebrovascular diseases. Six normal volunteers and ten patients with cerebrovascular occlusive diseases including 6 of IC occlusion and 4 of post EC/IC bypass surgery underwent time-resolved projection MRA on a 1.5 T clinical MRI system. Projection angiograms are acquired with 2D-fast SPGR sequence with a time resolution of approximately one image per second, 40 images being acquired consecutively before and after bolus injection Gd-DTPA. And all images were calculated by complex subtraction from the background mask in a work station. In normal volunteers, the quality of images of time-resolved projection MRA was satisfactory. The arteries from internal carotid artery through M2 segment of middle cerebral artery and all major venous systems were well portrayed. In 4 cases of IC occlusion who were assessed the collateral flow through the anterior communicating artery and posterior communicating artery, there were delayed to demonstrate the ipsilateral MCA. However, in 2 cases of IC occlusion that were assessed the collateral flow through leptomeningeal anastomosis, ipsilateral MCA and collateral circulation were not demonstrated. In all patients of post EC/IC bypass surgery, the patency of EC/IC bypass could be evaluated as properly with time-resolved projection MRA as 3D-TOF MRA. Although the temporal and spatial resolutions are insufficient, time-resolved projection MRA was power-full non-invasive method to evaluate the cerebral hemodynamics vis the basal communicating arteries in IC occlusion and identify the patency of EC/IC bypass. (author)

  10. A Comparison between Gadofosveset Trisodium and Gadobenate Dimeglumine for Steady State MRA of the Thoracic Vasculature

    OpenAIRE

    Camren, G. Paul; Wilson, Gregory J.; Bamra, Vikram R.; Nguyen, Khahn Q.; Hippe, Daniel S.; Maki, Jeffrey H.

    2014-01-01

    Purpose. Retrospective comparison between gadofosveset trisodium and gadobenate dimeglumine steady state magnetic resonance angiography (SS-MRA) of the thoracic vasculature at 1.5T using signal-to-noise ratio (SNR) and vessel edge sharpness (ES) as markers of image quality. Materials and Methods. IRB approval was obtained. Twenty separate patients each underwent SS-MRA using high-resolution 3D ECG-triggered coronal IR-TFE at 1.5T approximately 3-4 minutes following 10 or 15 mL gadofosveset or...

  11. The internal carotid artery stenosis or occlusion. The evaluation for the posterior communicating artery on DSA and MRA

    International Nuclear Information System (INIS)

    Zhao Yunhui; Gao Xinjiang; Ma Zhubin; Xu Yikai

    2003-01-01

    Objective: To study the changes of the posterior communicating artery in patients with internal carotid artery (ICA) severe stenosis or occlusion on digital subtract angiography (DSA) and magnetic resonance angiography (MRA). Methods: DSA or MRA findings were analyzed in 74 patients with ICA stenosis or occlusion and in 120 persons selected in the control group, who were unremarkable on cerebral DSA or MRA. Results: On DSA, the presence rate of ipsilateral posterior communicating artery (PCoA) between the study group and the control group had no significant difference; on MRA the rate in the study group was significantly higher than the control group (P 0.05). In the study group, the presence rate of PCoA on DSA was significantly higher than that on MRA (P 0.05). The presence rate of PCoA shown no significant difference between the cases with unilateral ICA involved and cases with bilateral ICA involved. Conclusion: The posterior communicating artery is very important to the patients with the internal carotid artery stenosis or occlusion. Its dilatation on DSA and MRA or appearance on MRA shows its compensation. DSA is valuable in the evaluation of the posterior communicating artery. MRA is a noninvasive and functional imaging method for evaluation the posterior communicating artery

  12. Usefulness of 2D PC MRA of the circle of willis in the evaluation of acute cerebral infarction

    Energy Technology Data Exchange (ETDEWEB)

    Kwon, Oh Han; Lee, Jae Hee; Kim, Ki Ju; Lee, Sung Yong [Our Lady of Mercy Hospital, Seoul (Korea, Republic of); Choi, Kyu Ho [The Catholic Univ. of Korea, Seoul (Korea, Republic of)

    1999-11-01

    To evaluate the usefulness of axial 2-D PC MRA of the circle of Willis in the evaluation of acute cerebral infarction We evaluated 42 patients with acute cerebral infarction who had undergone T2-weighted and diffusion weighted MR imaging (T2WI, DWI) and 2-D PC MRA of the circle of Willis within 72 hours of the onset of symptoms. In conjunction with high-signal lesions on DWI, the findings of 2-D PC MRA were classified as normal, stenotic, or indicative of arterial occlusion;negative 2-D PC MRA was not considered useful. In addition, the signal intensity of T2WI and DWI was compared. (The findings of 2-D PC MRA showed that 15 cases(35.7%) were normal, 13(31%) were stenotic, and that in 14 (33.3%), occlusion was present). Thus, 2-D PC MRA detected vascular abnormality in 27 cases(64.3%). On T2WI, six cases (14.3%) showed no signal change and 36(85.7%) showed high signal change. In six cases without signal change, MR images were obtained within 12 hours of ictus;in one of these patients MRA findings were normal, one had stenosis, and in four, occlusion was noted. 2-D PC MRA is a useful modality for the detection of vascular abnormality in patients with acute cerebral infarct.

  13. Follow-up of intracranial aneurysms treated with detachable coils: comparison of 3D inflow MRA at 3T and 1.5T and contrast-enhanced MRA at 3T with DSA

    International Nuclear Information System (INIS)

    Ramgren, Birgitta; Siemund, Roger; Cronqvist, Mats; Undren, Per; Holtaas, Stig; Nilsson, Ola G.; Larsson, Elna-Marie

    2008-01-01

    The purpose of this prospective study was to compare 3T and 1.5T magnetic resonance angiography (MRA) with digital subtraction angiography (DSA) for the follow-up of endovascular treated intracranial aneurysms to assess the grade of occlusion. Thirty-seven patients with 41 aneurysms who had undergone endovascular treatment with detachable coils were included. MRA was performed on the same day using an eight-channel sensitivity encoding head-coil with 3D axial inflow technique. At 3T, a contrast-enhanced transverse 3D fast gradient echo acquisition was also performed. Most patients underwent DSA the following day. MRA scans and DSA were classified first independently by two neuroradiologists and an interventional neuroradiologist. Secondly, a consensus was done. Source images, maximum intensity projection, multiplanar reconstruction and volume rendering reconstructions were used for MRA evaluations. A modification of the Raymond classification, previously used for DSA evaluation of recanalization, was used. Statistical comparison of the consensus showed that 3T MRA with 3D axial inflow technique had better agreement with DSA (κ = 0.43) than 1.5T MRA(κ = 0.21) and contrast-enhanced MRA (CE-MRA) at 3T (κ = 0.17). The susceptibility artefacts from the coil mesh were significally smaller at 3T (p = 0.002-0.007) than at 1.5T. 3T MRA, using a sensitivity encoding head-coil, showed better agreement with DSA than 1.5T and CE-MRA at 3T for evaluation of aneurysms treated with endovascular coiling. (orig.)

  14. Non-contrast MRA using an inflow-enhanced, inversion recovery SSFP technique in pediatric abdominal imaging

    International Nuclear Information System (INIS)

    Serai, Suraj; Towbin, Alexander J.; Podberesky, Daniel J.

    2012-01-01

    Abdominal contrast-enhanced MR angiography (CE-MRA) is routinely performed in children. CE-MRA is challenging in children because of patient motion, difficulty in obtaining intravenous access, and the inability of young patients to perform a breath-hold during imaging. The combination of pediatric-specific difficulties in imaging and the safety concerns regarding the risk of gadolinium-based contrast agents in patients with impaired renal function has renewed interest in the use of non-contrast (NC) MRA techniques. At our institution, we have optimized 3-D NC-MRA techniques for abdominal imaging. The purpose of this work is to demonstrate the utility of an inflow-enhanced, inversion recovery balanced steady-state free precession-based (b-SSFP) NC-MRA technique. (orig.)

  15. Feasibility of magnetic resonance angiography (MRA) follow-up as the primary imaging modality after coiling of intracranial aneurysms

    International Nuclear Information System (INIS)

    Bakker, Nicolaas A.; Metzemaekers, Jan D. M.; Dijk, J. Marc C. van; Mooij, Jan Jakob A.; Groen, Rob J. M.; Westerlaan, Henriette E.; Eshghi, Omid S.

    2010-01-01

    Background: Digital subtraction angiography (DSA) is still regarded as the gold standard for detecting residual flow in treated aneurysms. Recent reports have also shown excellent results from magnetic resonance angiography (MRA) imaging. This is an important observation, since DSA is associated with a risk of medical complications, is time consuming, and is more expensive. Purpose: To determine whether MRA could replace conventional DSA and serve as the primary postinterventional imaging modality in patients with coiled intracranial aneurysms. Material and Methods: We studied a prospectively enrolled cohort of 190 patients treated endovascularly for a first-ruptured and/or unruptured intracranial aneurysm between January 2004 and December 2008. The imaging protocol included a 1.5T time-of-flight (TOF) MRA and a DSA at 3 months (on the same day) and, depending on comparability, a 1.5T TOF-MRA or DSA 1 year after treatment. All images were evaluated by a multidisciplinary panel. Results: In 141/190 patients, both an MRA and DSA were performed after 3-month follow-up. In 2/141 patients (1.4%), (small) neck remnants gave false-negative MRA results. In one patient (0.7%), this led to additional neurosurgical clipping of the aneurysm. In 25/141 patients, future follow-up (>3 months) consisted of DSA because of various reasons. In 24/25 of these patients, primary MRA images alone would invariably have led to additional DSA imaging. Conclusion: The present study shows that 1.5T TOF-MRA is a feasible primary follow-up modality after coiling of intracranial aneurysms. Given our data, we now suggest that, in every patient with a coiled intracranial aneurysm, the first follow-up, 3 months after coiling, should be an MRA study. Only when this MRA is inconclusive (e.g., because of coil artifacts), or in the case of suspicion of recanalization, should DSA be performed additionally

  16. MRI/MRA evaluation of sickle cell disease of the brain

    International Nuclear Information System (INIS)

    Zimmerman, Robert A.

    2005-01-01

    Sickle cell disease is a major cause of pediatric stroke. Understanding the disease that affects the brain as infarctions, both clinically apparent and silent, requires an understanding of how the blood vessels are affected, the way in which both the brain and the blood vessels are imaged by MRI and MRA and the mechanism of injury. (orig.)

  17. The Impact of MRA in the IT sector on the Korean Economy

    Directory of Open Access Journals (Sweden)

    Wankeun Oh

    2005-12-01

    Full Text Available In this paper, using partial equilibrium models and input-output analyses, we estimate the effects of MRA in the IT sector on the net exports of Korea as well as on the Korean macro economy in the aspects of production, value-added and employment. It is noted that there are significant increases in both net exports and national income, which is mainly made possible by decreases in certification costs and testing costs and hence by final product prices. We show that the MRA with U.S. and/or China has much larger effects on the Korean economy than the MRA with Japan. Among various IT sub-sectors of Korea, the mobile handset industry sector is found out to be the largest beneficiary of MRA. These results make sense in two reasons: U.S. and China are the largest two trade partners of Korea in the IT sector; the mobile handset sector is the largest contributor of exports in Korea.

  18. Dynamic CE-MRA for endoleak classification after endovascular aneurysm repair.

    NARCIS (Netherlands)

    Laan, M.J. van der; Bakker, C.J.; Blankensteijn, J.D.; Bartels, L.W.

    2006-01-01

    AIM: To evaluate the value of dynamic contrast enhanced magnetic resonance angiography (CE-MRA) for classification of endoleaks after endovascular aneurysm repair (EVAR). MATERIALS AND METHODS: Twenty-eight patients, between 2 days and 54 months after EVAR, were evaluated with CTA, MRI and dynamic

  19. Dynamic CE=MRA for endoleak classification after endovascular aneurysm repair

    NARCIS (Netherlands)

    van der Laan, MJ; Bakker, CJG; Blankensteijn, JD; Bartels, LW

    Aim. To evaluate the value of dynamic contrast enhanced magnetic resonance angiography (CE-MRA)for classification of endoleaks after endovascular aneurysm repair (EVAR). Materials and methods. Twenty-eight patients, between 2 days and 54 months after EVAR, were evaluated with CTA, MRI and dynamic

  20. The impact of injector-based contrast agent administration in time-resolved MRA.

    Science.gov (United States)

    Budjan, Johannes; Attenberger, Ulrike I; Schoenberg, Stefan O; Pietsch, Hubertus; Jost, Gregor

    2018-05-01

    Time-resolved contrast-enhanced MR angiography (4D-MRA), which allows the simultaneous visualization of the vasculature and blood-flow dynamics, is widely used in clinical routine. In this study, the impact of two different contrast agent injection methods on 4D-MRA was examined in a controlled, standardized setting in an animal model. Six anesthetized Goettingen minipigs underwent two identical 4D-MRA examinations at 1.5 T in a single session. The contrast agent (0.1 mmol/kg body weight gadobutrol, followed by 20 ml saline) was injected using either manual injection or an automated injection system. A quantitative comparison of vascular signal enhancement and quantitative renal perfusion analyses were performed. Analysis of signal enhancement revealed higher peak enhancements and shorter time to peak intervals for the automated injection. Significantly different bolus shapes were found: automated injection resulted in a compact first-pass bolus shape clearly separated from the recirculation while manual injection resulted in a disrupted first-pass bolus with two peaks. In the quantitative perfusion analyses, statistically significant differences in plasma flow values were found between the injection methods. The results of both qualitative and quantitative 4D-MRA depend on the contrast agent injection method, with automated injection providing more defined bolus shapes and more standardized examination protocols. • Automated and manual contrast agent injection result in different bolus shapes in 4D-MRA. • Manual injection results in an undefined and interrupted bolus with two peaks. • Automated injection provides more defined bolus shapes. • Automated injection can lead to more standardized examination protocols.

  1. Evaluation of fast highly undersampled contrast-enhanced MR angiography (sparse CE-MRA) in intracranial applications - initial study

    International Nuclear Information System (INIS)

    Gratz, Marcel; Quick, Harald H.; Schlamann, Marc; Goericke, Sophia; Maderwald, Stefan

    2017-01-01

    To assess the image quality of sparsely sampled contrast-enhanced MR angiography (sparse CE-MRA) providing high spatial resolution and whole-head coverage. Twenty-three patients scheduled for contrast-enhanced MR imaging of the head, (N = 19 with intracranial pathologies, N = 9 with vascular diseases), were included. Sparse CE-MRA at 3 Tesla was conducted using a single dose of contrast agent. Two neuroradiologists independently evaluated the data regarding vascular visibility and diagnostic value of overall 24 parameters and vascular segments on a 5-point ordinary scale (5 = very good, 1 = insufficient vascular visibility). Contrast bolus timing and the resulting arterio-venous overlap was also evaluated. Where available (N = 9), sparse CE-MRA was compared to intracranial Time-of-Flight MRA. The overall rating across all patients for sparse CE-MRA was 3.50 ± 1.07. Direct influence of the contrast bolus timing on the resulting image quality was observed. Overall mean vascular visibility and image quality across different features was rated good to intermediate (3.56 ± 0.95). The average performance of intracranial Time-of-Flight was rated 3.84 ± 0.87 across all patients and 3.54 ± 0.62 across all features. Sparse CE-MRA provides high-quality 3D MRA with high spatial resolution and whole-head coverage within short acquisition time. Accurate contrast bolus timing is mandatory. (orig.)

  2. Evaluation of fast highly undersampled contrast-enhanced MR angiography (sparse CE-MRA) in intracranial applications - initial study

    Energy Technology Data Exchange (ETDEWEB)

    Gratz, Marcel; Quick, Harald H. [University of Duisburg-Essen, Erwin L. Hahn Institute for MR Imaging, Essen (Germany); University Hospital Essen, High Field and Hybrid MR Imaging, Essen (Germany); Schlamann, Marc [University Hospital Giessen and Marburg GmbH, Neuroradiology, Giessen (Germany); University Hospital Essen, Department of Diagnostic and Interventional Radiology and Neuroradiology, Essen (Germany); Goericke, Sophia [University Hospital Essen, Department of Diagnostic and Interventional Radiology and Neuroradiology, Essen (Germany); Maderwald, Stefan [University of Duisburg-Essen, Erwin L. Hahn Institute for MR Imaging, Essen (Germany)

    2017-03-15

    To assess the image quality of sparsely sampled contrast-enhanced MR angiography (sparse CE-MRA) providing high spatial resolution and whole-head coverage. Twenty-three patients scheduled for contrast-enhanced MR imaging of the head, (N = 19 with intracranial pathologies, N = 9 with vascular diseases), were included. Sparse CE-MRA at 3 Tesla was conducted using a single dose of contrast agent. Two neuroradiologists independently evaluated the data regarding vascular visibility and diagnostic value of overall 24 parameters and vascular segments on a 5-point ordinary scale (5 = very good, 1 = insufficient vascular visibility). Contrast bolus timing and the resulting arterio-venous overlap was also evaluated. Where available (N = 9), sparse CE-MRA was compared to intracranial Time-of-Flight MRA. The overall rating across all patients for sparse CE-MRA was 3.50 ± 1.07. Direct influence of the contrast bolus timing on the resulting image quality was observed. Overall mean vascular visibility and image quality across different features was rated good to intermediate (3.56 ± 0.95). The average performance of intracranial Time-of-Flight was rated 3.84 ± 0.87 across all patients and 3.54 ± 0.62 across all features. Sparse CE-MRA provides high-quality 3D MRA with high spatial resolution and whole-head coverage within short acquisition time. Accurate contrast bolus timing is mandatory. (orig.)

  3. MRA versus digital subtraction angiography in acute subarachnoid haemorrhage: a blinded multireader study of prospectively recruited patients

    International Nuclear Information System (INIS)

    Jaeger, H.R.; Hausmann, O.; Moseley, I.F.; Taylor, W.J.; Mansmann, U.; Partzsch, U.

    2000-01-01

    We performed a blinded multireader study comparing MR angiography (MRA) with digital subtraction angiography (DSA) in 34 prospectively recruited patients who presented with acute subarachnoid haemorrhage (SAH). Two observers independently reviewed the MRA and DSA studies some months after clinical presentation. Presence of an aneurysm was rated on a 4-point confidence scale. Cases in which the initial interpretation of the observers varied were jointly reviewed to reach a consensus opinion. DSA was deliberately chosen not to represent the reference standard and the clinical course and surgical findings were used to explain significant differences between the consensus readings of MRA and DSA. Diagnostic confidence and interobserver agreement were, overall, higher on DSA than on MRA studies (κ DSA = 0.64 versus κ MRA = 0.52 with 95 % CI for Δ = κ DSA -κ MRA [-0.06, 0.31]). With both methods, discrepancies between observers were due to aneurysms overlooked rather than false-positive readings by one observer. Diagnostic accuracy therefore improved when the readings of the two observers were combined, particularly for MRA. Intermethod agreement was only fair and similar for both readers (κ reader 1 = 0.37 versus κ reader 2 = 0.32 with 95 % CI for Δ = κ reader 1 -κ reader 2 [-0.02, 0.11]). Both interobserver and intermethod agreements improved when the data were analysed on a per-study (positive or negative study) rather than on a per-aneurysm basis. Differences in the consensus reading were due to five aneurysms (four single and one multiple) detected only with MRA and five (two single and three multiple) detected only with DSA. MRA and DSA should be regarded as complementary in the investigation of patients with acute SAH. DSA can no longer be regarded as the reference standard. (orig.)

  4. Dissolved inorganic carbon, pH, alkalinity, temperature, salinity and other variables collected from discrete sample and profile observations using CTD, bottle and other instruments from AKADEMIK ALEKSANDR NESMEYANOV in the North Pacific Ocean and Sea of Okhotsk from 1993-08-08 to 1993-09-21 (NODC Accession 0115169)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NCEI Accession 0115169 includes discrete sample and profile data collected from AKADEMIK ALEKSANDR NESMEYANOV in the North Pacific Ocean and Sea of Okhotsk from...

  5. Contrast-enhanced time-resolved 3-D MRA: applications in neurosurgery and interventional neuroradiology

    International Nuclear Information System (INIS)

    Reinacher, Peter C.; Stracke, Paul; Reinges, Marcus H.T.; Hans, Franz J.; Krings, Timo

    2007-01-01

    The decision-making process in the endovascular treatment of cranial dural AV fistulas and angiomas and their follow-up after treatment is usually based on conventional digital subtraction angiography (DSA). Likewise, acquiring the vascular and hemodynamic information needed for presurgical evaluation of meningiomas may necessitate DSA or different MR-based angiographic methods to assess the arterial displacement, the location of bridging veins and tumor feeders, and the degree of vascularization. New techniques of contrast-enhanced MR angiography (MRA) permit the acquisition of images with high temporal and spatial resolution. The purpose of this study was to evaluate the applicability and clinical use of a newly developed contrast-enhanced 3-D dynamic MRA protocol for neurointerventional and neurosurgical planning and decision making. With a 3-T whole-body scanner (Philips Achieva), a 3-D dynamic contrast-enhanced (MultiHance, Bracco) MRA sequence with parallel imaging, and intelligent k-space readout (keyhole and ''CENTRA'' k-space filling) was added to structural MRI in patients with meningiomas, dural arteriovenous fistulas and pial arteriovenous malformations. The sequence had a temporal resolution of 1.3 s per 3-D volume with a spatial resolution of 0.566 x 0.566 x 1.5 mm per voxel in each 3-D volume and lasted 25.2 s. DSA was performed in selected patients following MRI. In patients with arteriovenous fistulas and malformations, MRA allowed the vascular shunt to be identified and correctly classified. Hemodynamic characteristics and venous architecture were clearly demonstrated. Larger feeding arteries could be identified in all patients. In meningiomas, MRA enabled assessment of the displacement of the cerebral arteries, depiction of the tumor feeding vessels, and evaluation of the anatomy of the venous system. The extent of tumor vascularization could be assessed in all patients and correlated with the histopathological findings that indicated

  6. Contrast-enhanced time-resolved 3-D MRA: applications in neurosurgery and interventional neuroradiology

    Energy Technology Data Exchange (ETDEWEB)

    Reinacher, Peter C.; Stracke, Paul; Reinges, Marcus H.T.; Hans, Franz J.; Krings, Timo [University Hospital of the Technical University, Department of Neurosurgery, Aachen (Germany)

    2007-07-15

    The decision-making process in the endovascular treatment of cranial dural AV fistulas and angiomas and their follow-up after treatment is usually based on conventional digital subtraction angiography (DSA). Likewise, acquiring the vascular and hemodynamic information needed for presurgical evaluation of meningiomas may necessitate DSA or different MR-based angiographic methods to assess the arterial displacement, the location of bridging veins and tumor feeders, and the degree of vascularization. New techniques of contrast-enhanced MR angiography (MRA) permit the acquisition of images with high temporal and spatial resolution. The purpose of this study was to evaluate the applicability and clinical use of a newly developed contrast-enhanced 3-D dynamic MRA protocol for neurointerventional and neurosurgical planning and decision making. With a 3-T whole-body scanner (Philips Achieva), a 3-D dynamic contrast-enhanced (MultiHance, Bracco) MRA sequence with parallel imaging, and intelligent k-space readout (keyhole and ''CENTRA'' k-space filling) was added to structural MRI in patients with meningiomas, dural arteriovenous fistulas and pial arteriovenous malformations. The sequence had a temporal resolution of 1.3 s per 3-D volume with a spatial resolution of 0.566 x 0.566 x 1.5 mm per voxel in each 3-D volume and lasted 25.2 s. DSA was performed in selected patients following MRI. In patients with arteriovenous fistulas and malformations, MRA allowed the vascular shunt to be identified and correctly classified. Hemodynamic characteristics and venous architecture were clearly demonstrated. Larger feeding arteries could be identified in all patients. In meningiomas, MRA enabled assessment of the displacement of the cerebral arteries, depiction of the tumor feeding vessels, and evaluation of the anatomy of the venous system. The extent of tumor vascularization could be assessed in all patients and correlated with the histopathological findings that

  7. Problema interpretatsii / Aleksandr Shegedin

    Index Scriptorium Estoniae

    Shegedin, Aleksandr

    2004-01-01

    Vene Riigiduuma ratifitseeris Venemaa ning Euroopa Liidu vahelise partnerlus- ja koostöölepingu, samuti Venemaa ühinemislepingu Kyoto protokolliga. Autor hindab nende lepingute võimalikku mõju Eesti-Vene suhetele

  8. MRI and MRA of kidney transplants - evaluation of vessels and perfusion

    International Nuclear Information System (INIS)

    Wiesner, W.; Pfammatter, T.; Krestin, G.P.; Debatin, J.F.

    1998-01-01

    Purpose: To document the value of fast contrast enhanced-sequences in the assessment of the vascular supply and parenchymal perfusion in renal transplants. Patients: 18 recipients of a renal transplant were examined with a 1.5-Tesla-MR-system. The protocol included fast contrast enhanced 3D MR angiography and coronal 2D GRE sequences. The transplant artery and vein were assessed as well as regional parenchymal perfusion. Results: 3D MRA detected three transplant artery stenoses and one occlusion. In addition, two renal vein thromboses and one compression were identified. Perfusion deficits were documented in 8 renal transplants: Renal infarction (n=4), cortical necrosis (n=2), acute tubular necrosis (n=1) and venous ischemia (n=1). Fluid collections were documented as well as dilatation of the collecting system and abnormalities of the surrounding tissues. Conclusion: Contrast enhanced MRI and MRA permit a comprehensive assessment of renal transplants without inducing nephrotoxicity. (orig.) [de

  9. Time-resolved imaging of contrast kinetics does not improve performance of follow-up MRA of embolized intracranial aneurysms.

    Science.gov (United States)

    Serafin, Zbigniew; Strześniewski, Piotr; Lasek, Władysław; Beuth, Wojciech

    2012-07-01

    The use of contrast media and the time-resolved imaging of contrast kinetics (TRICKS) technique have some theoretical advantages over time-of-flight magnetic resonance angiography (TOF-MRA) in the follow-up of intracranial aneurysms after endovascular treatment. We prospectively compared the diagnostic performance of TRICKS and TOF-MRA with digital subtracted angiography (DSA) in the assessment of occlusion of embolized aneurysms. Seventy-two consecutive patients with 72 aneurysms were examined 3 months after embolization. Test characteristics of TOF-MRA and TRICKS were calculated for the detection of residual flow. The results of quantification of flow were compared with weighted kappa. Intraobserver and interobserver reproducibility was determined. The sensitivity of TOF-MRA was 85% (95% CI, 65-96%) and of TRICKS, 89% (95% CI, 70-97%). The specificity of both methods was 91% (95% CI, 79-98%). The accuracy of the flow quantification ranged from 0.76 (TOF-MRA) to 0.83 (TRICKS). There was no significant difference between the methods in the area under the ROC curve regarding both the detection and the quantification of flow. Intraobserver reproducibility was very good with both techniques (kappa, 0.86-0.89). The interobserver reproducibility was moderate for TOF-MRA and very good for TRICKS (kappa, 0.74-0.80). In this study, TOF-MRA and TRICKS presented similar diagnostic performance; therefore, the use of time-resolved contrast-enhanced MRA is not justified in the follow-up of embolized aneurysms.

  10. Jugular bulb diverticulum combined with high jugular bulb: a case report with CT and MRA findings

    International Nuclear Information System (INIS)

    Ko, Seog Wan

    2004-01-01

    Jugular bulb diverticulum is a rare condition that is characterized by the outpouching of the jugular bulb, and this can lead to hearing loss, tinnitus and vertigo. A few reports have revealed the radiologic findings about jugular bulb diverticulum, but none of them have described the MRA findings concerning this lesion. We present here the CT and MR venography findings in regards to a large high jugular blub and diverticulum we observed in a 47-year-old woman

  11. Jugular bulb diverticulum combined with high jugular bulb: a case report with CT and MRA findings

    Energy Technology Data Exchange (ETDEWEB)

    Ko, Seog Wan [College of Medicine, Chonbuk National Univ., Jeonju (Korea, Republic of)

    2004-12-01

    Jugular bulb diverticulum is a rare condition that is characterized by the outpouching of the jugular bulb, and this can lead to hearing loss, tinnitus and vertigo. A few reports have revealed the radiologic findings about jugular bulb diverticulum, but none of them have described the MRA findings concerning this lesion. We present here the CT and MR venography findings in regards to a large high jugular blub and diverticulum we observed in a 47-year-old woman.

  12. A Comparison between Gadofosveset Trisodium and Gadobenate Dimeglumine for Steady State MRA of the Thoracic Vasculature

    Directory of Open Access Journals (Sweden)

    G. Paul Camren

    2014-01-01

    Full Text Available Purpose. Retrospective comparison between gadofosveset trisodium and gadobenate dimeglumine steady state magnetic resonance angiography (SS-MRA of the thoracic vasculature at 1.5T using signal-to-noise ratio (SNR and vessel edge sharpness (ES as markers of image quality. Materials and Methods. IRB approval was obtained. Twenty separate patients each underwent SS-MRA using high-resolution 3D ECG-triggered coronal IR-TFE at 1.5T approximately 3-4 minutes following 10 or 15 mL gadofosveset or 20 mL gadobenate. ROIs were placed in the right atrium, left ventricle, left atrium, ascending aorta, descending aorta, and right pulmonary artery to estimate SNR. Vessel ES was estimated as 20–80% rise distances from line intensity profiles in the left pulmonary vein, ascending aorta, and descending aorta. Data were analyzed using nonpaired Student’s t-test (threshold for significance set at P<0.05. Results. There was no significant difference in mean SNR for the gadofosveset or gadobenate groups (P values: 0.14 to 0.85. There was no significant difference in mean vessel ES for gadofosveset and gadobenate groups (P values: 0.17 to 0.78. Conclusion. High quality thoracic SS-MRA can be achieved with gadobenate dimeglumine, similar to that achieved with the blood pool agent gadofosveset trisodium provided that imaging is initiated quickly (3-4 min after contrast injection.

  13. A comparison between gadofosveset trisodium and gadobenate dimeglumine for steady state MRA of the thoracic vasculature.

    Science.gov (United States)

    Camren, G Paul; Wilson, Gregory J; Bamra, Vikram R; Nguyen, Khahn Q; Hippe, Daniel S; Maki, Jeffrey H

    2014-01-01

    Retrospective comparison between gadofosveset trisodium and gadobenate dimeglumine steady state magnetic resonance angiography (SS-MRA) of the thoracic vasculature at 1.5T using signal-to-noise ratio (SNR) and vessel edge sharpness (ES) as markers of image quality. IRB approval was obtained. Twenty separate patients each underwent SS-MRA using high-resolution 3D ECG-triggered coronal IR-TFE at 1.5T approximately 3-4 minutes following 10 or 15 mL gadofosveset or 20 mL gadobenate. ROIs were placed in the right atrium, left ventricle, left atrium, ascending aorta, descending aorta, and right pulmonary artery to estimate SNR. Vessel ES was estimated as 20-80% rise distances from line intensity profiles in the left pulmonary vein, ascending aorta, and descending aorta. Data were analyzed using nonpaired Student's t-test (threshold for significance set at P < 0.05). There was no significant difference in mean SNR for the gadofosveset or gadobenate groups (P values: 0.14 to 0.85). There was no significant difference in mean vessel ES for gadofosveset and gadobenate groups (P values: 0.17 to 0.78). High quality thoracic SS-MRA can be achieved with gadobenate dimeglumine, similar to that achieved with the blood pool agent gadofosveset trisodium provided that imaging is initiated quickly (3-4 min) after contrast injection.

  14. Minimally invasive vascular imaging using 3D-CTA and 3D-MRA. Update

    International Nuclear Information System (INIS)

    Hayashi, Hiromitsu; Kawamata, Hiroshi; Takagi, Ryo; Amano, Yasuo; Wakabayashi, Hiroyuki; Ichikawa, Kazuo; Kumazaki, Tatsuo

    1998-01-01

    Conventional angiography is considered the standard of reference for diagnostic imaging of vascular diseases with respect to its temporal and spatial resolution. This procedure, however is invasive and repeated studies are difficult, and arterial complications are occasionally associated in catheter-based conventional angiography. Recent advances in diagnostic imaging have facilitated three-dimensional CT angiography (3D-CTA) using the volumetric acquisition capabilities inherent in spiral CT and three-dimensional MR angiography (3D-MRA) using the 3D gradient-echo sequence with a bolus injection of Gd-DTPA. These techniques can provide vascular images exceedingly similar to conventional angiograms within a short acquisition time. 3D-CTA and 3D-MRA are considered to be promising, minimally invasive methods for obtaining images of the vasculature, and alternatives to catheter angiography. This study reviews the current status of 3D-CTA and 3D-MRA, with emphasis on the clinical usefulness of three-dimensional diagnostic imaging for the evaluation of diverse vascular pathologies. (author)

  15. Prevalence of renal artery stenosis in flash pulmonary oedema: determination using gadolinium-enhanced MRA.

    LENUS (Irish Health Repository)

    McMahon, Colm J

    2012-02-01

    PURPOSE: The primary purpose was to determine the prevalence of renal artery stenosis (RAS) in patients presenting with acute ("flash") pulmonary oedema (FPE), without identifiable cause using contrast-enhanced magnetic resonance angiography (CE-MRA) of renal arteries. A secondary goal was to correlate clinical parameters at presentation with the presence or absence of RAS. MATERIALS AND METHODS: Patients presenting with acute pulmonary oedema without identifiable cause prospectively underwent CE-MRA. >50% renal artery stenosis was considered significant. Clinical parameters (blood pressure, serum creatinine, history of hypertension\\/hyperlipidaemia) were compared in patients with and without RAS using an unpaired t-test. Results expressed; mean (+\\/-SD). RESULTS: 20 patients (4 male, 16 female, age 78.5+\\/-11 years) underwent CE-MRA. 9 patients (45%) had significant RAS (6 (30%) bilateral, 3 (15%) unilateral). Systolic BP was higher in patients with RAS (192+\\/-38 mm Hg) than those without (134+\\/-30 mm Hg) (p<.005). Diastolic BP was higher in patients with RAS (102+\\/-23 mm Hg) than those without (76+\\/-17 mm Hg) (p<.01). All patients with RAS and 6\\/11(55%) patients without RAS had a history of hypertension. No significant difference in creatinine or hyperlipidaemia history was observed. CONCLUSION: The prevalence of RAS in patients presenting with FPE is 45%. The diagnosis should be considered in patients presenting with unexplained acute pulmonary oedema, particularly if hypertensive at presentation.

  16. The efficiency of magnetic resonance angiography (MRA) in the diagnosis vertebrobasilar insufficiency (VBI)

    International Nuclear Information System (INIS)

    Maeda, Hiroyuki; Ura, Masaharu; Ganaha, Akira; Yasuda, Shinobu; Noda, Yutaka

    2000-01-01

    Vertebrobasilar insufficiency (VBI) is found in many cases of vertigo in patients who visit otolaryngology clinics. But its symptoms tend to be transitory, and since objective findings cannot be obtained at the first examination it is difficult to diagnose. As a result, it is tentatively diagnosed based only on the past history or the outcome of an equilibrium test. It is useful to diagnose circulation insufficiency, the stenotic position or the degree of the vessels based on the angiography findings. However, an operation is dangerous and overly invasive and therefore surgery is often not performed in many cases. We performed magnetic resonance angiography (MRA) and found it to be easy to perform, safe, it required a short examination time and was not invasive. A total of 12 cases suspected to have VBI based on the findings of an equilibrium test, MRA was performed. We could identify the stenotic or obstructive position of the vessels in the vertebrobasilar system in six of the cases. In conclusion, MRA was found to have many advantages over angiography and thus was considered to be useful in making a definite diagnosis of VBI. (author)

  17. The efficiency of magnetic resonance angiography (MRA) in the diagnosis vertebrobasilar insufficiency (VBI)

    Energy Technology Data Exchange (ETDEWEB)

    Maeda, Hiroyuki; Ura, Masaharu; Ganaha, Akira; Yasuda, Shinobu; Noda, Yutaka [Ryukyus Univ., Nishihara, Okinawa (Japan). Faculty of Medicine

    2000-09-01

    Vertebrobasilar insufficiency (VBI) is found in many cases of vertigo in patients who visit otolaryngology clinics. But its symptoms tend to be transitory, and since objective findings cannot be obtained at the first examination it is difficult to diagnose. As a result, it is tentatively diagnosed based only on the past history or the outcome of an equilibrium test. It is useful to diagnose circulation insufficiency, the stenotic position or the degree of the vessels based on the angiography findings. However, an operation is dangerous and overly invasive and therefore surgery is often not performed in many cases. We performed magnetic resonance angiography (MRA) and found it to be easy to perform, safe, it required a short examination time and was not invasive. A total of 12 cases suspected to have VBI based on the findings of an equilibrium test, MRA was performed. We could identify the stenotic or obstructive position of the vessels in the vertebrobasilar system in six of the cases. In conclusion, MRA was found to have many advantages over angiography and thus was considered to be useful in making a definite diagnosis of VBI. (author)

  18. Systolically gated 3D phase contrast MRA of mesenteric arteries in suspected mesenteric ischemia

    Energy Technology Data Exchange (ETDEWEB)

    Wasser, M.N.; Schultze Kool, L.J.; Roos, A. de [Leiden Univ. Hospital (Netherlands)] [and others

    1996-03-01

    Our goal was to assess the value of MRA for detecting stenoses in the celiac (CA) and superior mesenteric (SMA) arteries in patients suspected of having chronic mesenteric ischemia, using an optimized systolically gated 3D phase contrast technique. In an initial study in 24 patients who underwent conventional angiography of the abdominal vessels for different clinical indications, a 3D phase contrast MRA technique (3D-PCA) was evaluated and optimized to image the CAs and SMAs. Subsequently, a prospective study was performed to assess the value of systolically gated 3D-PCA in evaluation of the mesenteric arteries in 10 patients with signs and symptoms of chronic mesenteric ischemia. Intraarterial digital subtraction angiography and surgical findings were used as the reference standard. In the initial study, systolic gating appeared to be essential in imaging the SMA on 3D-PCA. In 10 patients suspected of mesenteric ischemia, systolically gated 3D-PCA identified significant proximal disease in the two mesenteric vessels in 4 patients. These patients underwent successful reconstruction of their stenotic vessels. Cardiac-gated MRA may become a useful tool in selection of patients suspected of having mesenteric ischemia who may benefit from surgery. 16 refs., 6 figs., 4 tabs.

  19. Anatomic vascular phantom for the verification of MRA and XRA visualization and fusion

    International Nuclear Information System (INIS)

    Mankovich, N.J.; Lambert, T.; Zrimec, T.; Hiller, J.

    1995-01-01

    A project is underway to develop automated methods of fusing cerebral magnetic resonance angiography (MRA) and x-ray angiography (XRA) for creating accurate visualizations used in planning treatment of vascular disease. The authors have developed a vascular phantom suitable for testing segmentation and fusion algorithms with either derived images (pseudo-MRA/pseudo-XRA) or actual MRA or XRA image sequences. The initial unilateral arterial phantom design, based on normal human anatomy, contains 48 tapering vascular segments with lumen diameters from 2.5 millimeter to 0.25 millimeter. The initial phantom used rapid prototyping technology (stereolithography) with a 0.9 millimeter vessel wall fabricated in an ultraviolet-cured plastic. The model fabrication resulted in a hollow vessel model comprising the internal carotid artery, the ophthalmic artery, and the proximal segments of the anterior, middle, and posterior cerebral arteries. The complete model was fabricated but the model's lumen could not be cleared for vessels with less than 1 millimeter diameter. Measurements of selected vascular outer diameters as judged against the CAD specification showed an accuracy of 0.14 mm and precision (standard deviation) of 0.15 mm. The plastic vascular model produced provides a fixed geometric framework for the evaluation of imaging protocols and the development of algorithms for both segmentation and fusion

  20. Gadopentate dimeglumine enhanced MR angiography (MRA) for staging AAA: a correlation with DSA and CT

    International Nuclear Information System (INIS)

    Arlart, I.P.; Gerlach, A.; Kolb, M.; Erpenbach, S.; Wuerstlin, S.

    1997-01-01

    Purpose: To evaluate a contrast-enhanced (CE) MRA sequence for staging AAA. Methods: In 24 patients (male=20, female=4, age=44-81 y) with known AAA the abdominal aorta and its branches including the iliac arteries were imaged, using a 3D GRE-FISP sequence (1.5 T, T R /T E /FA=25/6/35, slab=100-140 mm, 32 part., FOV=440-450 mm, matrix=256x256) during an i.v. infusion of 40 ml of gadopentate dimeglumine. In addition, representative axial single slices (2D breathhold FLASH-sequence: T R /T E /FA=82/5/30) were acquired following contrast application. MR-results were correlated with i.a. DSA and CT studies. Results: With CE-MRA, AAA (n=24) and iliac aneurysms (n=17) could be evaluated in all cases (sens.=100%, spec.=100%) including luminal patency and mural thrombus. 50/54 renal arteries could be identified, 4/6 accessory renal arteries (sens=66,6%, spec.=100%), 8/9 renal artery stenoses>50% (sens.=88.8%, spec.=89.3%), 1/1 renal artery occlusion and 7/8 iliac artery stenoses>50% (sens.=87.5%, spec.=97.5%) were depicted correctly. Proximal portion of sup. mes. art. could be detected and evaluated in 21/24 cases. Quantitative determination of therapeutically relevant vascular paramters using MRA was comparable to DSA and CT. (orig./AJ) [de

  1. MRA of the intracranial circulation in asymptomatic patients with sickle cell disease

    International Nuclear Information System (INIS)

    Gillams, A.R.; McMahon, L.; Weinberg, G.; Carter, A.P.

    1998-01-01

    Background. MR angiography (MRA) provides a mechanism for non-invasively studying blood flow, thus providing a new opportunity to study the intracranial circulation in asymptomatic sickle cell disease (SCD) patients. Although conventional angiography is the gold standard for the depiction of vascular anatomy, this is too invasive for an asymptomatic population. Objective. To establish the range of appearances in asymptomatic SCD patients and to correlate brain MRI results (either sub-clinical abnormalities or normal brain parenchyma) with the MRA findings. Materials and methods. Brain MRI and MRA of the intracranial circulation was performed on 22 patients (13 male and 9 female, median age 7.5 years, range 1.3-20 years). Fourteen were homozygous SS and eight were SC. The median haematocrit at the time of MRI was 25.9 (range 13.8-33.3). Results. On MR imaging, four patients had infarcts in eight vascular territories (six anterior and two posterior). In 3/4 of anterior vascular territories with infarction, long (≥ 6 mm) segments of abnormal signal were seen at the internal carotid artery bifurcation with associated reduced distal flow. Short focal areas of abnormal signal were commonly seen where vessels branched, bifurcated or curved and were not associated with infarcts. These areas probably represent turbulence-related dephasing secondary to high velocity flow found in SCD. Conclusion. Long segments (≥ 6 mm) of abnormal signal with reduced distal flow correlated with sub-clinical infarction. (orig.)

  2. Comparison of high-resolution contrast-enhanced 3D MRA with digital subtraction angiography in the evaluation of hepatic arterial anatomy

    International Nuclear Information System (INIS)

    Matoba, M.; Tonami, H.; Kuginuki, M.; Yokota, H.; Takashima, S.; Yamamoto, I.

    2003-01-01

    AIM: To evaluate the validity of high-resolution contrast-enhanced three-dimensional magnetic resonance angiography (MRA) in defining hepatic arterial anatomy and to compare this with digital subtraction angiography (DSA). MATERIALS AND METHODS: MRA and DSA were performed in 30 patients. MRA was performed with breath-hold, gadolinium-enhanced, three-dimensional, fast low-angle shot sequence with a 512 pixel matrix. MRA was compared with DSA in terms of image quality and depiction of hepatic arterial anatomy. The agreement in image quality between MRA and DSA was determined with the kappa statistic. RESULTS: With respect to image quality, there was excellent or good correlation between MRA and DSA for the common hepatic artery (κ=0.85), proper hepatic artery (κ=0.72), gastroduodenal artery (κ=0.70), left hepatic artery (κ=0.49), left gastric artery (κ=0.50), splenic artery (κ=0.84), and superior mesenteric artery (κ=0.88). Poor correlation was found for the right hepatic artery (κ=0.18) and right gastric artery (κ=0.38). With regard to hepatic arterial anatomy, MRA correlated correctly with DSA in 28 of the 29 cases, i.e. 97% of patients. CONCLUSION: MRA is a useful technique for the evaluation of the hepatic artery, and for the vast majority of patients, MRA can replace intra-arterial DSA

  3. Evaluation by MRA of aortic dilation late after repair of tetralogy of Fallot.

    Science.gov (United States)

    Kay, W Aaron; Cook, Stephen C; Daniels, Curt J

    2013-09-10

    This study evaluated predictors for aortic dilation (AD) in patients with repaired tetralogy of Fallot (rTOF) using magnetic resonance angiography (MRA). AD is common in patients with rTOF and may result in increased morbidity and mortality. There are no guidelines for evaluation of AD for rTOF patients. All adults with rTOF who previously underwent MRA had retrospective aortic measurements at the sinuses of Valsalva (SoV) and ascending aorta (AsAo). Rate of change in diameter was determined in patients with multiple MRAs. Chart review identified risk factors for AD. Univariate and multivariate analyses tested predictors of AD. Of the 87 patients who met the inclusion criteria, 12 (14%) had AD. At baseline, mean diameter was 3.6 ± 0.6 cm and 3.1 ± 0.6 cm at the SoV and AsAo, respectively. The AsAo was larger than the SoV in 17%. Predictors of AD included male gender, age, right aortic arch, pregnancy, older age at complete repair, smoking, and systemic hypertension. Serial studies were available in 55 patients; the rate of growth was slow: 0.4 ± 0.9 mm/year (SoV) and 0.1 ± 0.8mm/year (AsAo). AD is common in rTOF at the SoV and AsAo. Transthoracic echocardiography, which does not always image the AsAo as well as MRA, may not image AD in rTOF in cases in which the AsAo is dilated. Although several risk factors correlate with AD in rTOF, the rate of aortic growth is slow, suggesting that rTOF patients may not require frequent aortic imaging. Copyright © 2012 Elsevier Ireland Ltd. All rights reserved.

  4. Time-resolved echo-shared parallel MRA of the lung: observer preference study of image quality in comparison with non-echo-shared sequences

    International Nuclear Information System (INIS)

    Fink, C.; Puderbach, M.; Zaporozhan, J.; Plathow, C.; Kauczor, H.-U.; Ley, S.

    2005-01-01

    The aim of this study was to evaluate the image quality of time-resolved echo-shared parallel MRA of the lung. The pulmonary vasculature of nine patients (seven females, two males; median age: 44 years) with pulmonary disease was examined using a time-resolved MRA sequence combining echo sharing with parallel imaging (time-resolved echo-shared angiography technique, or TREAT). The sharpness of the vessel borders, conspicuousness of peripheral lung vessels, artifact level, and overall image quality of TREAT was assessed independently by four readers in a side-by-side comparison with non-echo-shared time-resolved parallel MRA data (pMRA) previously acquired in the same patients. Furthermore, the SNR of pulmonary arteries (PA) and veins (PV) achieved with both pulse sequences was compared. The mean voxel size of TREAT MRA was decreased by 24% compared with the non-echo-shared MRA. Regarding the sharpness of the vessel borders, conspicuousness of peripheral lung vessels, and overall image quality the TREAT sequence was rated superior in 75-76% of all cases. If the TREAT images were preferred over the pMRA images, the advantage was rated as major in 61-71% of all cases. The level of artifacts was not increased with the TREAT sequence. The mean interobserver agreement for all categories ranged between fair (artifact level) and good (overall image quality). The maximum SNR of TREAT did not differ from non-echo-shared parallel MRA (PA: TREAT: 273±45; pMRA: 280±71; PV: TREAT: 273±33; pMRA: 258±62). TREAT achieves a higher spatial resolution than non-echo-shared parallel MRA which is also perceived as an improved image quality. (orig.)

  5. Non-contrast-enhanced imaging of haemodialysis fistulas using quiescent-interval single-shot (QISS) MRA: a feasibility study

    International Nuclear Information System (INIS)

    Okur, A.; Kantarci, M.; Karaca, L.; Yildiz, S.; Sade, R.; Pirimoglu, B.; Keles, M.; Avci, A.; Çankaya, E.; Schmitt, P.

    2016-01-01

    Aim: To assess the efficiency of a novel quiescent-interval single-shot (QISS) technique for non-contrast-enhanced magnetic resonance angiography (MRA) of haemodialysis fistulas. Materials and methods: QISS MRA and colour Doppler ultrasound (CDU) images were obtained from 22 haemodialysis patients with end-stage renal disease (ESRD). A radiologist with extensive experience in vascular imaging initially assessed the fistulas using CDU. Two observers analysed each QISS MRA data set in terms of image quality, using a five-point scale ranging from 0 (non-diagnostic) to 4 (excellent), and lumen diameters of all segments were measured. Results: One hundred vascular segments were analysed for QISS MRA. Two anastomosis segments were considered non-diagnostic. None of the arterial or venous segments were evaluated as non-diagnostic. The image quality was poorer for the anastomosis level compared to the other segments (p<0.001 for arterial segments, and p<0.05 for venous segments), while no significant difference was determined for other vascular segments. Conclusion: QISS MRA has the potential to provide valuable complementary information to CDU regarding the imaging of haemodialysis fistulas. In addition, QISS non-enhanced MRA represents an alternative for assessment of haemodialysis fistulas, in which the administration of iodinated or gadolinium-based contrast agents is contraindicated. - Highlights: • Close monitoring and early intervention in hemodialysis fistulas may prolong longevity fistulas. • DopplerUS, contrast enhanced CT and MRI are using assessment of hemodialysis fistulas. • QISS nonenhanced MR angiography represents an alternative for assessment of hemodialysis fistulas.

  6. Congenital diseases of the thoracic aorta. Role of MRI and MRA

    International Nuclear Information System (INIS)

    Russo, Vincenzo; Renzulli, Matteo; Palombara, Cesare la; Fattori, Rossella

    2006-01-01

    Aortic malformations may be associated with other congenital heart abnormalities or may present independently, as incidental findings in asymptomatic patients. For more than 30 years, conventional imaging techniques for detection and assessment of congenital anomalies of the aorta have been chest X-ray, echocardiography and angiography. In recent times, considerable interest in congenital aortic diseases has been shown, due to technical progresses of noninvasive imaging modalities. Among them, magnetic resonance imaging (MRI) almost certainly offers the greatest advantages, especially in young patients in which a radiation exposure must be avoided as much as possible. MRI provides an excellent visualization of vascular structures with a wide field of view, well suited for evaluation of the thoracic aorta malformations. With the implementation of magnetic resonance angiography (MRA) it is also possible to depict any relationship with supra-aortic or mediastinal vessels. Phase contrast technique allows identification of the hemodynamic significance of the aortic alteration. Some technical considerations, which include fast spin-echo, gradient-echo and, especially, MRA techniques with phase-contrast and contrast enhanced methods, are discussed and applied in the evaluation of congenital thoracic aorta diseases. (orig.)

  7. Application of virtual reality on MRA data of complex vascular structures

    International Nuclear Information System (INIS)

    Floemer, F.; Knopp, M.V.; Schoenberg, S.O.; Glombitza, G.; Meinzer, H.P.; Brockmeier, K.

    2000-01-01

    During the last years because of the progress in magnetic resonance imaging (MRI) magnetic resonance angiography (MRA) has become a serious alternative to conventional X-ray angiography. The potential of MRA in combination with methods for three-dimensional reconstruction will be presented and different methods for image post-processing are discussed based on a number of cases. The examinations were performed on a clinical 1.5 T magnetic resonance tomograph (Siemens Vision, Erlangen) using conventional MR angiographgy sequences. The different options of post-processing were carried out online on the console and offline using dedicated workstations (Siemens Virtuoso and CHILI). Discussion: Complex post-processing procedures are applied to different areas like pulmonary vasculature, thoracic aorta, abdominal aorta, and renal transplant arteries. Different diagnostic values can be seen for the variety of three-dimensional reconstruction methods. According to our experience volume rendering has been selected as the method of choice due to the time needed for reconstruction and the information content of the resulting image. (orig.) [de

  8. Assessment of intra and extra cranial atherosclerosis in coronary artery disease. Advantage of MRI/MRA

    International Nuclear Information System (INIS)

    Kondo, Hirohide; Oda, Yoshinori; Hirai, Akio; Ibukiyama, Chiharu; Utsugi, Osamu

    1999-01-01

    The incidence of arteriosclerosis has increased in recent years as the aging population has grown. We carried out the present study to investigate the association of internal carotid arteriosclerosis, sclerosis of intracranial main arteries, and cerebral arteriolosclerosis to coronary arteriosclerosis using MRI and MRA in a total of 133 consecutive patients (107 males and 26 females), who visited our hospital with a main complaint of chest pain. We also examined serum lipids and the presence or absence of hypertension and/or diabetes. Coronary arteriosclerosis underlying atherosclerotic lesions was correlated with internal carotid arteriosclerosis, serum cholesterol and low HDL cholesterol level. As characteristic findings of this study, lacunar infarction (LI), which is thought to represent cerebral arteriolosclerosis, was not only significantly correlated with age and hypertension, but increased also lacunar infarcts in number as the number of affected coronary branches increased. Examination of the cases of severe coronary artery disease with MRI/MRA was thought to be able to predict the occurrence of cerebrovascular disorder after CABG and to be useful for the selection of a therapeutic regimen, such as PTCA and MID-CABG. (author)

  9. Diagnosis of moyamoya disease using 3-T MRI and MRA: value of cisternal moyamoya vessels

    Energy Technology Data Exchange (ETDEWEB)

    Sawada, Takeshi; Yamamoto, Akira; Okada, Tomohisa; Kanagaki, Mitsunori; Kasahara, Seiko; Togashi, Kaori [Kyoto University, Department of Diagnostic Imaging and Nuclear Medicine, Graduate School of Medicine, Kyoto (Japan); Miki, Yukio [Osaka City University, Department of Radiology, Graduate School of Medicine, Osaka (Japan); Kikuta, Ken-ichiro [Fukui University, Division of Neurosurgery, Department of Sensory and Locomotor Medicine, Faculty of Medical Sciences, Fukui (Japan); Miyamoto, Susumu; Takahashi, Jun C. [Kyoto University, Department of Neurosurgery, Graduate School of Medicine, Kyoto (Japan); Fukuyama, Hidenao [Kyoto University, Human Brain Research Center, Graduate School of Medicine, Kyoto (Japan)

    2012-10-15

    The purpose of this study was to propose new magnetic resonance (MR) criteria of diagnosing moyamoya disease (MMD) from cisternal moyamoya vessels (MMVs) on 3-T magnetic resonance imaging (MRI)/magnetic resonance angiography (MRA) and compare the diagnostic accuracy of the existing MR criteria and the proposed MR criteria. Participants comprised 20 consecutive patients with MMD (4 males, 16 females) diagnosed clinically using conventional angiography and 20 controls (13 male and 7 female arteriosclerosis patients). In these participants, 3-T MRI/MRA was evaluated by the existing MR criteria, which use MMVs in the basal ganglia, and the proposed MR criteria, which use cisternal MMVs, and then these two criteria were statistically compared by McNemar's test. Diagnostic accuracy was 62.5% with the existing MR criteria and 97.5% with the proposed MR criteria. The proposed MR criteria was more sensitive (1.00) than the existing MR criteria (0.45), but less specific (0.95) than the existing MR criteria (1.00). The proposed MR criteria using cisternal MMVs showed significantly higher diagnostic accuracy than the existing MR criteria. We believe that our proposed MR criteria will be beneficial for diagnosing MMD. (orig.)

  10. Diagnosis of moyamoya disease using 3-T MRI and MRA: value of cisternal moyamoya vessels

    International Nuclear Information System (INIS)

    Sawada, Takeshi; Yamamoto, Akira; Okada, Tomohisa; Kanagaki, Mitsunori; Kasahara, Seiko; Togashi, Kaori; Miki, Yukio; Kikuta, Ken-ichiro; Miyamoto, Susumu; Takahashi, Jun C.; Fukuyama, Hidenao

    2012-01-01

    The purpose of this study was to propose new magnetic resonance (MR) criteria of diagnosing moyamoya disease (MMD) from cisternal moyamoya vessels (MMVs) on 3-T magnetic resonance imaging (MRI)/magnetic resonance angiography (MRA) and compare the diagnostic accuracy of the existing MR criteria and the proposed MR criteria. Participants comprised 20 consecutive patients with MMD (4 males, 16 females) diagnosed clinically using conventional angiography and 20 controls (13 male and 7 female arteriosclerosis patients). In these participants, 3-T MRI/MRA was evaluated by the existing MR criteria, which use MMVs in the basal ganglia, and the proposed MR criteria, which use cisternal MMVs, and then these two criteria were statistically compared by McNemar's test. Diagnostic accuracy was 62.5% with the existing MR criteria and 97.5% with the proposed MR criteria. The proposed MR criteria was more sensitive (1.00) than the existing MR criteria (0.45), but less specific (0.95) than the existing MR criteria (1.00). The proposed MR criteria using cisternal MMVs showed significantly higher diagnostic accuracy than the existing MR criteria. We believe that our proposed MR criteria will be beneficial for diagnosing MMD. (orig.)

  11. Sequence comparison for non-enhanced MRA of the lower extremity arteries at 7 Tesla.

    Directory of Open Access Journals (Sweden)

    Sören Johst

    Full Text Available In this study three sequences for non-contrast-enhanced MRA of the lower extremity arteries at 7T were compared. Cardiac triggering was used with the aim to reduce signal variations in the arteries. Two fast single-shot 2D sequences, a modified Ultrafast Spoiled Gradient Echo (UGRE sequence and a variant of the Quiescent-Interval Single-Shot (QISS sequence were triggered via phonocardiogram and compared in volunteer examinations to a non-triggered 2D gradient echo (GRE sequence. For image acquisition, a 16-channel transmit/receive coil and a manually positionable AngioSURF table were used. To tackle B1 inhomogeneities at 7T, Time-Interleaved Acquisition of Modes (TIAMO was integrated in GRE and UGRE. To compare the three sequences quantitatively, a vessel-to-background ratio (VBR was measured in all volunteers and stations. In conclusion, cardiac triggering was able to suppress flow artifacts satisfactorily. The modified UGRE showed only moderate image artifacts. Averaged over all volunteers and stations, GRE reached a VBR of 4.18±0.05, UGRE 5.20±0.06, and QISS 2.72±0.03. Using cardiac triggering and TIAMO imaging technique was essential to perform non-enhanced MRA of the lower extremities vessels at 7T. The modified UGRE performed best, as observed artifacts were only moderate and the highest average VBR was reached.

  12. Comparison of 7.0- and 3.0-T MRI and MRA in ischemic-type moyamoya disease: preliminary experience.

    Science.gov (United States)

    Deng, Xiaofeng; Zhang, Zihao; Zhang, Yan; Zhang, Dong; Wang, Rong; Ye, Xun; Xu, Long; Wang, Bo; Wang, Kai; Zhao, Jizong

    2016-06-01

    OBJECT The authors compared the image quality and diagnostic sensitivity and specificity of 7.0-T and 3.0-T MRI and time-of-flight (TOF) MR angiography (MRA) in patients with moyamoya disease (MMD). METHODS MR images of 15 patients with ischemic-type MMD (8 males, 7 females; age 13-48 years) and 13 healthy controls (7 males, 6 females; age 19-28 years) who underwent both 7.0-T and 3.0-T MRI and MRA were studied retrospectively. The main intracranial arteries were assessed by using the modified Houkin's grading system (MRA score). Moyamoya vessels (MMVs) were evaluated by 2 grading systems: the MMV quality score and the MMV area score. Two diagnostic criteria for MMD were used: the T2 criteria, which used flow voids in the basal ganglion on T2-weighted images, and the TOF criteria, which used the high-intensity areas in the basal ganglion on source images from TOF MRA. All data were evaluated by 2 independent readers who were blinded to the strength field and presence or absence of MMD. Using conventional angiography as the gold standard, the sensitivity and specificity of 7.0-T and 3.0-T MRI/MRA in the diagnosis of MMD were calculated. The differences between 7.0-T and 3.0-T MRI and MRA were statistically compared. RESULTS No significant differences were observed between 7.0-T and 3.0-T MRA in MRA score (p = 0.317) or MRA grade (p = 0.317). There was a strong correlation between the Suzuki's stage and MRA grade in both 3.0-T (rs = 0.930; p 3.0-T MRA, suggested by both the MMV quality score (p = 0.001) and the MMV area score (p = 0.001). The correlation between the Suzuki's stage and the MMV area score was moderate in 3.0-T MRA (rs = 0.738; p = 0.002) and strong in 7.0-T MRA (rs = 0.908; p 3.0-T MRI/MRA (sensitivity 0.692; specificity 0.933) in diagnosing MMD; based on the TOF criteria, 7.0-T MRI/MRA was more sensitive (1.000 vs 0.733, respectively) and more specific (1.000 vs 0.923, respectively) than 3.0-T MRI/MRA. CONCLUSIONS Compared with 3.0-T MRI/MRA, 7.0-T

  13. Magnetic resonance angiography (MRA) of the circle of Willis: a prospective comparison with conventional angiography in 54 subjects

    International Nuclear Information System (INIS)

    Patrux, B.; Laissy, J.P.; Jouini, S.; Kawiecki, W.; Coty, P.; Thiebot, J.

    1994-01-01

    We prospectively correlated the findings of magnetic resonance angiography (MRA) with those of transfemoral four-vessel angiography in 54 patients to investigate the direction of flow within the circle of Willis. Our primary goal was to assess the direction of flow using the size of the vessel and signal intensity, without saturation techniques. Analysis of the circle of Willis, especially the communicating arteries, was performed double-blind by two groups of two radiologists. Three types of arteries were identified: high flow or cross-cerebral circulation, patent and nonvisualised arteries. Cerebral angiography was the standard for comparison between the two methods. MRA did not reveal any arteries invisible on angiography, thus providing a specificity of 100%. The sensitivity of MRA was 89.2% for the anterior and 81.3% for the posterior communicating arteries, and 100% for the anterior, middle and posterior cerebral arteries. MRA was shown to be a useful technique for the assessment of patency of the circle of Willis. (orig.)

  14. Magnetic resonance angiography (MRA) of the circle of Willis: a prospective comparison with conventional angiography in 54 subjects

    Energy Technology Data Exchange (ETDEWEB)

    Patrux, B. (Neuroradiology, CHU Charles Nicolle, Rouen (France)); Laissy, J.P. (Neuroradiology, CHU Charles Nicolle, Rouen (France) Dept. of Radiology, CHU Bichat, Paris (France)); Jouini, S. (Neuroradiology, CHU Charles Nicolle, Rouen (France)); Kawiecki, W. (Siemens Medical Systems, Saint-Denis (France)); Coty, P. (Neuroradiology, CHU Charles Nicolle, Rouen (France)); Thiebot, J. (Neuroradiology, CHU Charles Nicolle, Rouen (France))

    1994-04-01

    We prospectively correlated the findings of magnetic resonance angiography (MRA) with those of transfemoral four-vessel angiography in 54 patients to investigate the direction of flow within the circle of Willis. Our primary goal was to assess the direction of flow using the size of the vessel and signal intensity, without saturation techniques. Analysis of the circle of Willis, especially the communicating arteries, was performed double-blind by two groups of two radiologists. Three types of arteries were identified: high flow or cross-cerebral circulation, patent and nonvisualised arteries. Cerebral angiography was the standard for comparison between the two methods. MRA did not reveal any arteries invisible on angiography, thus providing a specificity of 100%. The sensitivity of MRA was 89.2% for the anterior and 81.3% for the posterior communicating arteries, and 100% for the anterior, middle and posterior cerebral arteries. MRA was shown to be a useful technique for the assessment of patency of the circle of Willis. (orig.)

  15. Sum of top-hat transform based algorithm for vessel enhancement in MRA images

    Science.gov (United States)

    Ouazaa, Hibet-Allah; Jlassi, Hajer; Hamrouni, Kamel

    2018-04-01

    The Magnetic Resonance Angiography (MRA) is rich with information's. But, they suffer from poor contrast, illumination and noise. Thus, it is required to enhance the images. But, these significant information can be lost if improper techniques are applied. Therefore, in this paper, we propose a new method of enhancement. We applied firstly the CLAHE method to increase the contrast of the image. Then, we applied the sum of Top-Hat Transform to increase the brightness of vessels. It is performed with the structuring element oriented in different angles. The methodology is tested and evaluated on the publicly available database BRAINIX. And, we used the measurement methods MSE (Mean Square Error), PSNR (Peak Signal to Noise Ratio) and SNR (Signal to Noise Ratio) for the evaluation. The results demonstrate that the proposed method could efficiently enhance the image details and is comparable with state of the art algorithms. Hence, the proposed method could be broadly used in various applications.

  16. Contrast-enhanced MRA of the renal and aorto-iliac-femoral arteries: Comparison of gadobenate dimeglumine and gadofosveset trisodium

    International Nuclear Information System (INIS)

    Iezzi, Roberto; Soulez, Gilles; Thurnher, Siegfried; Schneider, Guenther; Kirchin, Miles A.; Shen, Ningyan; Pirovano, Gianpaolo; Spinazzi, Alberto

    2011-01-01

    Rationale and objectives: Dedicated contrast agents are now available for contrast-enhanced magnetic resonance angiography (CE-MRA). This study retrospectively compares the safety and diagnostic performance data from Phase III regulatory trials performed to evaluate gadobenate dimeglumine (MultiHance) and gadofosveset trisodium (Vasovist) for renal and peripheral CE-MRA. Materials and methods: Similar examination and blinded assessment methodology was utilized in all studies to determine the safety and diagnostic performance of the agents for detection of significant (>50%) steno-occlusive disease. Digital Subtraction Angiography (DSA) was used as the standard of truth. Diagnostic performance data (sensitivity, specificity, predictive values [PVs], and likelihood ratios [LRs]) were compared (Chi-square test). Results: CE-MRA with gadobenate dimeglumine was more specific (92.4% vs. 80.5%, p < 0.0001) and accurate (83.6% vs. 77.1%, p = 0.022) than CE-MRA with gadofosveset in the detection of significant renal artery stenosis. The average sensitivity was higher for gadofosveset (74.4% vs. 67.3%, p = 0.011) in peripheral vessels although gadobenate dimeglumine was more specific (93.0% vs. 88.2%, p < 0.0001) with no difference in accuracy (86.6% vs. 86.3%, p = 0.66). PPVs were higher (p < 0.0001) for gadobenate dimeglumine in both vascular territories. Pre- to post-test shifts in the probability of detecting significant disease were greater after gadobenate dimeglumine. Adverse events in the renal and peripheral studies were reported by 9.2% and 7.7% of patients after gadobenate dimeglumine compared with 30.3% and 22.1% of patients after gadofosveset. Conclusion: The diagnostic performance of CE-MRA for the detection of significant steno-occlusive disease is similar with gadofosveset and gadobenate dimeglumine although the rate of adverse events appears higher with gadofosveset.

  17. Contrast-enhanced MRA of the renal and aorto-iliac-femoral arteries: Comparison of gadobenate dimeglumine and gadofosveset trisodium

    Energy Technology Data Exchange (ETDEWEB)

    Iezzi, Roberto [Department of Radiology, Universita G. D' Annunzio, Chieti (Italy); Soulez, Gilles [Centre Hospitalier de L' Universite De Montreal, Montreal (Quebec) (Canada); Thurnher, Siegfried [Department of Radiology, Hospital Brothers of St. John of God, Vienna (Austria); Schneider, Guenther [Department of Diagnostic and Interventional Radiology, University Hospital of Saarland, Homburg/Saar (Germany); Kirchin, Miles A., E-mail: miles.kirchin@bracco.com [Worldwide Medical and Regulatory Affairs, Bracco Imaging SpA, Via E. Folli, 50, Milan 20134 (Italy); Shen, Ningyan; Pirovano, Gianpaolo; Spinazzi, Alberto [Worldwide Medical and Regulatory Affairs, Bracco Diagnostics, Princeton, NJ (United States)

    2011-02-15

    Rationale and objectives: Dedicated contrast agents are now available for contrast-enhanced magnetic resonance angiography (CE-MRA). This study retrospectively compares the safety and diagnostic performance data from Phase III regulatory trials performed to evaluate gadobenate dimeglumine (MultiHance) and gadofosveset trisodium (Vasovist) for renal and peripheral CE-MRA. Materials and methods: Similar examination and blinded assessment methodology was utilized in all studies to determine the safety and diagnostic performance of the agents for detection of significant (>50%) steno-occlusive disease. Digital Subtraction Angiography (DSA) was used as the standard of truth. Diagnostic performance data (sensitivity, specificity, predictive values [PVs], and likelihood ratios [LRs]) were compared (Chi-square test). Results: CE-MRA with gadobenate dimeglumine was more specific (92.4% vs. 80.5%, p < 0.0001) and accurate (83.6% vs. 77.1%, p = 0.022) than CE-MRA with gadofosveset in the detection of significant renal artery stenosis. The average sensitivity was higher for gadofosveset (74.4% vs. 67.3%, p = 0.011) in peripheral vessels although gadobenate dimeglumine was more specific (93.0% vs. 88.2%, p < 0.0001) with no difference in accuracy (86.6% vs. 86.3%, p = 0.66). PPVs were higher (p < 0.0001) for gadobenate dimeglumine in both vascular territories. Pre- to post-test shifts in the probability of detecting significant disease were greater after gadobenate dimeglumine. Adverse events in the renal and peripheral studies were reported by 9.2% and 7.7% of patients after gadobenate dimeglumine compared with 30.3% and 22.1% of patients after gadofosveset. Conclusion: The diagnostic performance of CE-MRA for the detection of significant steno-occlusive disease is similar with gadofosveset and gadobenate dimeglumine although the rate of adverse events appears higher with gadofosveset.

  18. Long-term MRA follow-up after coiling of intracranial aneurysms: impact on mood and anxiety

    International Nuclear Information System (INIS)

    Ferns, Sandra P.; Nieuwkerk, Pythia T.; Majoie, Charles B.L.M.; Rooij, Willem Jan J. van; Rinkel, Gabriel J.E.

    2011-01-01

    Magnetic resonance angiography (MRA) screening for recurrence of a coiled intracranial aneurysm and formation of new aneurysms long-term after coiling may induce anxiety and depression. In coiled patients, we evaluated effects on mood and level of anxiety from long-term follow-up MRA in comparison to general population norms. Of 162 patients participating in a long-term (>4.5 years) MRA follow-up after coiling, 120 completed the EQ-5D questionnaire, a visual analog health scale and a self-developed screening related questionnaire at the time of MRA. Three months later, the same questionnaires were completed by 100 of these 120 patients. Results were compared to general population norms adjusted for gender and age. Any problem with anxiety or depression was reported in 56 of 120 patients (47%; 95%CI38 56%) at baseline and 42 of 100 patients (42%; 95%CI32 52%) at 3 months, equally for screen-positives and -negatives. Compared to the reference population, participants scored 38% (95%CI9 67%) and 27% (95%CI4 50%) more often any problem with anxiety or depression. Three months after screening, 21% (20 of 92) of screen-negatives and 13% (one of eight) of screen-positives reported to be less afraid of subarachnoid hemorrhage (SAH) compared to before screening. One of eight screen-positives reported increased fear of SAH. Patients with coiled intracranial aneurysms participating in long-term MRA screening reported significantly more often to be anxious or depressed than a reference group. Screening did not significantly increase anxiety or depression temporarily. However, subjectively, patients did report an increase in anxiety caused by screening, which decreased after 3 months. (orig.)

  19. Long-term MRA follow-up after coiling of intracranial aneurysms: impact on mood and anxiety

    Energy Technology Data Exchange (ETDEWEB)

    Ferns, Sandra P.; Nieuwkerk, Pythia T.; Majoie, Charles B.L.M. [Academic Medical Center, Department of Radiology, Amsterdam (Netherlands); Rooij, Willem Jan J. van [St. Elisabeth Ziekenhuis, Department of Radiology, Tilburg (Netherlands); Rinkel, Gabriel J.E. [University Medical Center, Department of Neurology, Rudolf Magnus Institute of Neuroscience, Utrecht (Netherlands)

    2011-05-15

    Magnetic resonance angiography (MRA) screening for recurrence of a coiled intracranial aneurysm and formation of new aneurysms long-term after coiling may induce anxiety and depression. In coiled patients, we evaluated effects on mood and level of anxiety from long-term follow-up MRA in comparison to general population norms. Of 162 patients participating in a long-term (>4.5 years) MRA follow-up after coiling, 120 completed the EQ-5D questionnaire, a visual analog health scale and a self-developed screening related questionnaire at the time of MRA. Three months later, the same questionnaires were completed by 100 of these 120 patients. Results were compared to general population norms adjusted for gender and age. Any problem with anxiety or depression was reported in 56 of 120 patients (47%; 95%CI38<->56%) at baseline and 42 of 100 patients (42%; 95%CI32<->52%) at 3 months, equally for screen-positives and -negatives. Compared to the reference population, participants scored 38% (95%CI9<->67%) and 27% (95%CI4<->50%) more often any problem with anxiety or depression. Three months after screening, 21% (20 of 92) of screen-negatives and 13% (one of eight) of screen-positives reported to be less afraid of subarachnoid hemorrhage (SAH) compared to before screening. One of eight screen-positives reported increased fear of SAH. Patients with coiled intracranial aneurysms participating in long-term MRA screening reported significantly more often to be anxious or depressed than a reference group. Screening did not significantly increase anxiety or depression temporarily. However, subjectively, patients did report an increase in anxiety caused by screening, which decreased after 3 months. (orig.)

  20. Contrast enhanced MRA: do contrast agents with a higher T1 relaxitivity improve the visualization of carotid artery stenoses?

    International Nuclear Information System (INIS)

    Friese, S.; Krapf, H.; Skalej, M.; Kueker, W.; Fetter, M.; Vonthein, R.

    2001-01-01

    CE-MRA is a powerful tool for the non-invasive evaluation of carotid artery occlusive disease. However, due to certain drawbacks, it has not completely replaced DSA. The purpose of this study was to evaluate if Gd-BOPTA, a contrast agent with high T 1 relaxivity, can increase the diagnostic accuracy of CE-MRA. Material and Methods: The CE-MRA examinations of 54 consecutive patients were evaluated by two experienced radiologists, independently. The examinations of 27 patients were contrasted either with 20 ml Gd-BOPTA or with 20 ml Gd-DTPA. The reviewers were blinded to the contrast agent chosen and to the ultrasound results. They rated the overall image quality and the degree of the ICA stenoses. Results: For the estimation of the degree of the ICA stenoses there was a high interrater validity. In comparison to the ultrasound findings, 6 of 50 high-degree stenoses were underestimated as moderate stenoses. In one of seven sonographically occluded vessels, MRA revealed residual patency in the vessel lumen. It was not possible to identify the contrast agent that was taken for a study. Subjective estimation of the image quality (arterial contrast of the ICA, contrast of the other vessels, and general impression) did not significantly change with the contrast agent employed. Conclusion: The diagnostic accuracy of CE-MRA for the evaluation of internal carotid artery stenoses is not improved by Gd-BOPTA if identical volumina of contrast media are applied. The potential of this contrast agent can be the reduction of the amount of contrast without loss of diagnostic information. Further studies are necessary. (orig.) [de

  1. Identification of offending vessele in trigeminal neuralgia and hemifacial spasm using SPGR-MRI and 3D-TOF-MRA

    International Nuclear Information System (INIS)

    Niwa, Yoshikazu; Shiotani, Masahiro; Karasawa, Hidetake; Ohseto, Kiyoshige; Naganuma, Yoshikazu

    1996-01-01

    We investigated 100 consecutive patients with trigeminal neuralgia (TN) and 53 patients with hemifacial spasm (HFS) concerning the anatomical relationship between the root entry (exit) zone (REZ) of cranial nerve and the offending artery, using spoiled GRASS MRI (SPGR-MRI) and three dimensional-time of fly-MRA (MRA). In 67 of 100 (67%) patients with TN, this new radiological method, SPGR-MRI and MRA demonstrated the relationship between the fifth cranial nerve root and offending artery causing neurovascular compression (NVC), and in 46 of 53 (87%) with HFS, demonstrated the similar relationship between seventh and eighth nerve complex and offending artery. Microvascular decompression (MVD) was performed in 10 with HFS, and NVC of the REZ of the facial nerve caused by the offending artery was exactly predicted by SPGR-MRI and MRA in 9 (90%). The combination of SPGR-MRI and MRA is very useful for demonstrating NVC as the cause of TN and HFS. On the other hand, we investigated asymptomatic 206 trigemimal and 253 facial nerves about the relationship between their REZ and the surrounding structures using the similar method. The contact of REZ of cranial nerve with surrounding artery is demonstrated in 31.6% of trigeminal nerves and in 22.5% of facial nerves. These results indicate that the contact of REZ of cranial nerve with surrounding artery is not rare in healthy subjects, though causing TN and HFS in particular patients. In this context, we discussed the difference between the contact which is asymptomatic and the compression which is symptomatic. (author)

  2. Clinical usefulness of MRI and MRA in children with partial epilepsy; Ocena znaczenia klinicznego obrazowania MRI i MRA w padaczce czesciowej u dzieci

    Energy Technology Data Exchange (ETDEWEB)

    Zajac, A; Kacinski, M; Kubik, A; Kroczka, S [Klinika Neurologii Dzieciecej, Uniwersytet Jagiellonski, Collegium Medicum, Cracow (Poland)

    2006-07-01

    Partial epilepsy is a very important problem of epileptology in childhood including clinical and therapeutic aspect especially surgery treatment. The aim of this study is to assess clinical value of neuroimagine techniques (structural MRI, MRI angiography) in partial epilepsy diagnostics in children. The relation between results of examinations with these methods and congenital and acquired risk factors related to partial epilepsy, age of its onset and clinical assessment of patients was analyzed. The study group consisted of 140 children with partial epilepsy hospitalized between 1998 and 2004 in Department of Pediatric Neurology, Collegium Medicum Jagiellonian University, Krakow. The group included 70 girls and 70 boys, the age ranged from 2 months to 17 years. In study group statistical analysis included different factors as which can be related with results of neuroimaging as age, load of pregnancy and birth period, familiar epilepsy, patient's risk factors for appearance of epilepsy, acquired risk factors of epilepsy, results of neurological examination, type of epilepsy, status epilepticus, and signs according epileptic attacks which can be related with neuroimaging results. The primary method of neuroimagine in all patients was structural MRI, in 16 cases Magnetic Resonance Angiography (MRA). The parametric tests (t-student), nonparametric Mann-Whitney's test were used in statistical analysis. The bilateral Fisher test was used to check rate in groups. There was assessed sensitivity, specificity, positive predictive value, negative predictive value; the 95% confidence interval was calculated for these parameters. Abnormalities in neurological examination in children with partial epilepsy were strongly correlated with MRI findings. The structural changes in MRI were found in younger children, whose course of epilepsy was longer than children without MRI changes. Changes in hippocampus ere the most common in children with partial epilepsy with abnormalities in

  3. Efficacy of patient selection strategies for carotid endarterectomy by contrast-enhanced MRA on a 1 T machine and duplex ultrasound in a regional hospital

    International Nuclear Information System (INIS)

    Korteweg, M.A.; Kerkhoff, H.; Bakker, J.; Elgersma, O.E.H.

    2008-01-01

    Aim: To investigate whether contrast-enhanced magnetic resonance angiography (CE-MRA) and duplex ultrasound (DUS) could replace digital subtraction angiography (DSA) for diagnosing internal carotid artery (ICA) stenosis in regional centres with less specialized technicians and equipment, such as a 1 Tesla MRI machine. Materials and methods: Sixty-six consecutive, symptomatic patients with ICA stenosis, as evidenced using DSA, were included. In the first 34 patients DUS was validated and cut-off criteria were established. Data were analysed by receiver operating characteristic curve and logistic regression. Two observers analysed the DUS and CE-MRA results of 32 patients. Stenoses were categorized in accordance with North American Symptomatic Endarterectomy Trial (NASCET) measurement criteria. Results: Peak systolic velocity (PSV) in the ICA was defined as a better parameter for defining stenosis than end diastolic velocity and the PSV ICA:common carotid artery ratio. The optimal PSV threshold was 230 cm/s. Four ICAs were not interpretable on DUS, and one on CE-MRA. Two patients did not undergo CE-MRA. The sensitivities and specificities were calculated: for DUS these were 100% and 68% respectively; for observer 1 on CE-MRA these were 93% and 89%, respectively; for observer 2 these were 92% and 87%, respectively. The sensitivity and specificity for combined DUS/CE-MRA were 100% and 85%, respectively. Seventy-eight percent of CE-MRA and DUS correlated. The weighted Kappa for CE-MRA and DSA were 0.8 and 0.9, respectively. Conclusion: DUS and CE-MRA are effective non-invasive methods for selecting patients with ICA stenosis for carotid endarterectomy in non-specialized centres using a 1 T machine. The present results suggest that no referrals to more specialized centres for non-invasive diagnostic work-up for carotid artery stenoses will be necessary

  4. Diagnostic accuracy of CTA and MRI/MRA in the evaluation of the cortical venous reflux in the intracranial dural arteriovenous fistula DAVF

    Energy Technology Data Exchange (ETDEWEB)

    Lin, Yen-Heng [National Taiwan University, Department of Medical Imaging and Radiology, Hospital and Medical College, Taipei (China); National Taiwan University Hospital, Department of Medical Imaging, Douliu City (China); Wang, Yu-Fen; Lee, Chung-Wei; Chen, Ya-Fang [National Taiwan University, Department of Medical Imaging and Radiology, Hospital and Medical College, Taipei (China); Liu, Hon-Man [National Taiwan University, Department of Medical Imaging and Radiology, Hospital and Medical College, Taipei (China); Fu Jen Catholic University, Department of Medical Imaging and Radiology, Hospital and Medical College, New Taipei City (China); Fu Jen Catholic University Hospital, Department of Medical Imaging, New Taipei City (China); Hsieh, Hong-Jen [National Taiwan University Hospital, Department of Medical Imaging, Douliu City (China)

    2018-01-15

    Computed tomography angiography (CTA) and magnetic resonance imaging/angiography (MRI/MRA) are used for the diagnosis of intracranial dural arteriovenous fistulas (DAVFs). The purpose of this study was to compare the diagnostic accuracy of CTA and magnetic resonance imaging/angiography (MRI/MRA) for detection of cortical venous reflux (CVR) in intracranial DAVFs. The records of patients with angiography-confirmed intracranial DAVFs who also received CTA and MRI/MRA from January 2008 to July 2016 were reviewed. CTA and MRI/MRA were reviewed for signs of CVR, and the diagnostic accuracy of individual signs was evaluated by receiver operating curve (ROC) analysis. A total 108 patients were included in this study. CTA signs of CVR included abnormal dilatation, early enhancement, and the presence of a medullary or pial vein. MRI/MRA signs of CVR included abnormal dilatation, early enhancement, flow-related enhancement, flow void, and medullary or pial venous collaterals. The sensitivity of individual CTA signs ranged from 62 to 96%, and specificities from 79 to 94%. The sensitivities of individual MRI/MRA signs ranged from 58 to 83%, and specificities from 77 to 93%. The area under ROC curve (AUC) of CTA and MRI/MRA were 0.91 and 0.87, respectively (P = 0.04 in direct comparison). In subgroup analysis, CTA had better diagnostic accuracy for higher grade disease (P = 0.05) and non-aggressive manifestation (P = 0.04). Both CTA and MRI/MRA have good diagnostic accuracy for detection of CVR in patients with intracranial DAVFs. There is modest evidence that CTA is better than MRI/MRA. (orig.)

  5. Preliminary evaluation of 3D TOF MRA fly-around advantages in the diagnosis of internal carotid artery aneurysms

    International Nuclear Information System (INIS)

    Zhu Yusen; Zhang Lina; Xu Ke; Li Songbai; Huang Yanling; Sun Wenge; Jin Anyu; Qi Xixun; Li Yanliang

    2004-01-01

    Objective: To assess the advantages and the clinical application value of 3D TOF MR angiography fly-around in diagnosing internal carotid artery aneurysms in comparison with multi-slice helical CT three dimensional angiography (MS 3D-CTA) and digital subtraction angiography (DSA). Methods: Eighteen patients with clinical suspected internal carotid artery aneurysms were involved in the study. There were 4 males and 14 females, and their age ranged from 17 to 76 years. 14 patients were with subarachnoid hemorrhage and 4 patients with oculomotor nerve palsy. All these patients underwent 3D TOF MRA and MS 3D-CTA, and 17 patients underwent DSA. All of them accepted operation treatment. 3D TOF MRA was performed with Toshiba 1.5 T MRI system and the parameters of 3D-TOF sequence were: TR 30 ms, TE 6.8 ms, field of view 17 cm x 19 cm, matrix 160 x 256, slab thickness 50-60 mm, section thickness 1.2 mm, flip angle 20 degree. Row data of MS 3D-CTA was acquired by Multi-slice helical CT-Aquilion (Toshiba). The scanning parameters were: image slice thickness 1.0 mm, scan speed 0.5 s/r, helical pitch 3.5, delay time 15-18 sec. Nonionic contrast agent was injected intravenously (2.0 ml/kg) at the speed of 4.0-5.0 ml/s using a power injector. Source images of 3D TOF MRA and MS 3D-CTA were processed into MIP and fly-around using a workstation SGI-O2, with the post-processing software Alatoview (Ver: 1.42). Conventional four-vessel digital subtraction angiography was performed with Siemens Multi-Start OT. Results: 22 aneurysms were detected by both 3D TOF MRA and MS 3D-CTA (1 ACA aneurysm, 3 ACoMA aneurysms, 1 left MCA aneurysm, 2 ICA-cavernous aneurysms, 3 left ICA-PCoM aneurysms, 8 right ICA-PCoM aneurysms, 1 left ICA-AChA aneurysms, 2 right ICA-AChA aneurysms, and 1 superior pituitary artery aneurysm). Among those aneurysms, one was not detected by DSA, and another aneurysm's neck was not clear on the image of DSA. 1 right ICA-PCoM aneurysm was surgically treated according to 3D

  6. Time-Resolved 3D Contrast-Enhanced MRA on 3.0T: a Non-Invasive Follow-Up Technique after Stent-Assisted Coil Embolization of the Intracranial Aneurysm

    International Nuclear Information System (INIS)

    Choi, Jin Woo; Roh, Hong Gee; Moon, Won Jin; Kim, Na Ra; Moon, Sung Gyu; Kang, Chung Hwan; Chun, Young Il; Kang, Hyun Seung

    2011-01-01

    To evaluate the usefulness of time-resolved contrast enhanced magnetic resonance angiography (4D MRA) after stent-assisted coil embolization by comparing it with time of flight (TOF)-MRA. TOF-MRA and 4D MRA were obtained by 3T MRI in 26 patients treated with stent-assisted coil embolization (Enterprise:Neuroform = 7:19). The qualities of the MRA were rated on a graded scale of 0 to 4. We classified completeness of endovascular treatment into three categories. The degree of quality of visualization of the stented artery was compared between TOF and 4D MRA by the Wilcoxon signed rank test. We used the Mann-Whitney U test for comparing the quality of the visualization of the stented artery according to the stent type in each MRA method. The quality in terms of the visualization of the stented arteries in 4D MRA was significantly superior to that in 3D TOF-MRA, regardless of type of the stent (p < 0.001). The quality of the arteries which were stented with Neuroform was superior to that of the arteries stented with Enterprise in 3D TOF (p < 0.001) and 4D MRA (p = 0.008), respectively. 4D MRA provides a higher quality view of the stented parent arteries when compared with TOF.

  7. Multimodal imaging in the elastase-induced aneurysm model in rabbits: a comparative study using serial DSA, MRA and CTA

    International Nuclear Information System (INIS)

    Doerfler, A.; Becker, W.; Wanke, I.; Goericke, S.; Oezkan, N.; Forsting, M.

    2004-01-01

    Background and Purpose: The elastase-induced aneurysm model in rabbits has proved to be suitable for testing new endovascular occlusion devices. The purpose of this study was to evaluate different imaging modalities for the depiction of anatomy and size of elastase-induced aneurysms and for serial follow-up imaging. Materials and Methods: Elastase-induced aneurysms were created in eight Chinchilla bastard rabbits by endoluminal incubation of porcine elastase. Serial imaging was performed using intravenous DSA (IVDSA), contrast-enhanced MRA (CEMRA), and time-of-flight MRA (TOF) 14 days, 4 weeks and 3 months after aneurysm creation. Intraarterial DSA (IADSA) and CT angiography (CTA) were performed after 3 months. Aneurysm size and geometry (height H, width W, neck width N) were compared. Results: On IVDSA after two weeks mean aneurysm height was 6.2 mm (range 2.8-11.0 mm), mean aneurysm neck width was 2.7 mm (range 2.0-4.2 mm) and mean aneurysm neck width was 2.7 mm (range 2.0-4.2 mm). We did not observed any statistically significant change in aneurysm dimensions during follow-up at 4 weeks (CEMRA: H: 5.4, W: 2.4, N: 2.4; TOF: H: 5.7, W: 2.4, N: 2.7) and 3 months (CEMRA: H: 5.8, W: 2.6, N: 2.6; TOF: H: 6.9, W: 2.8, N: 3.0). Aneurysm dimensions could be best seen on IADSA (H: 6.2, W: 3.0, N: 2.7) with good correlation to CTA (r=0.94; H: 6.1, W: 2.8, N: 2.6), CE-MRA (r=0.92), and TOF (r=0.97). TOF was superior to CEMRA in delineating the aneurysm wall. Conclusions: Serial imaging using MRA, CTA or intravenous and intraarterial angiography is feasible in the elastase-induced aneurysm model. Contrast-enhanced MRA, TOF-MRA and CTA showed good correlation to IADSA and are all suitable for non-invasive pretherapeutic measurement of aneurysm size. (orig.) [de

  8. Correlation of transcranial Doppler ultrasonography with MRI and MRA in the evaluation of sickle cell disease patients with prior stroke

    International Nuclear Information System (INIS)

    Kogutt, M.S.; Goldwag, S.S.; Gupta, K.L.; Kaneko, K.; Humbert, J.R.

    1994-01-01

    We prospectively evaluated a group of patients with sickle cell disease and a clinical history of prior stroke, comparing transcranial Doppler sonography (TCD) to both magnetic resonance imaging (MRI) and magnetic resonance angiography (MRA) to determine its efficacy for the detection of flow abnormalities associated with prior cerebral infarction. Using MRI as the standard examination, there was 94 % sensitivity and 30 % specificity, and using MRA as the standard examination, there was 91 % sensitivity and 22 % specificity. We concur with other reports that the transcranial Doppler examination is a highly sensitive study. In our group of sickle cell disease patients with prior stroke, TCD reliably detected flow abnormalities that correlated to areas of prior cerebral infarction. (orig.)

  9. [Can TOF MRA replace duplex and Doppler sonography in preoperative assessment of the carotid arteries? A prospective comparison and review of the literature].

    Science.gov (United States)

    Krappel, F A; Bauer, E; Harland, U

    2002-01-01

    To examine the quality and usefulness of time-of-flight MR-angiography and duplex-doppler sonography, respectively, in assessment of the extracranial arteries before cervical spine operations. Patients scheduled for operations of the cervical spine had an MRI plus TOF as well as a duplex and Doppler scan. At the time of the examination the radiologist and the neurologist in charge were blinded for the study. Endpoints were not only the accuracy of the procedures but more so which method improved the preoperative process most. Twenty patients were examined so far. Only in one case did the result differ when a complete occlusion diagnosed sonographically was judged as a severe stenosis on MRA. One patient did not tolerate the MRA for the extra 5 minutes necessary, therefore a contrast-enhanced MRA was performed. MRA eased the preoperative process as imaging of the pathology and the carotids were realised in one step. The costs were slightly higher for MRA than for duplex-doppler sonography. TOF-MRA can replace the duplex-doppler examination in the preoperative assessment of the carotids and has the potential to streamline the preoperative time schedule. Similar to duplex and doppler, in order to be accurate enough the method requires a high degree of expertise from the radiologist.

  10. Susceptibility-weighted angiography (SWAN) of cerebral veins and arteries compared to TOF-MRA

    International Nuclear Information System (INIS)

    Boeckh-Behrens, T.; Lutz, J.; Lummel, N.; Burke, M.; Wesemann, T.; Schöpf, V.; Brückmann, H.; Linn, J.

    2012-01-01

    Problem: High resolution, non-contrast imaging of both cerebral veins and arteries by use of gradient echo T2 star weighted angiography (SWAN) is a new method for susceptibility-weighted imaging with short acquisition times. We assessed the potential of this sequence for the depiction of both cerebral veins and arteries. Methods: 15 healthy volunteers were included in the study. MRI was performed on a 3 T MR scanner using the following sequences: (1) a 3D multi-echo gradient echo T2 star weighted angiography (SWAN), (2) an arterial 3D TOF MR angiography and (3) a venous 2D TOF. With regard to the SWAN sequence, both MinIP and MIP images were reconstructed and systematically compared to MIP reconstructions of the artTOF and the venTOF. To suggest possible clinical implications of our findings, we additionally included two illustrative cases. Results: With regard to the visualization of the cerebral veins, the MinIP reconstructions of the SWAN sequence were considerably superior compared to the venTOF. Concerning the depiction of the main segments of the big cerebral arteries the value of the MIP reconstructions of the SWAN was comparable to that of the artTOF with limitations in the homogenity and in the depiction of smaller arteries. Conclusions: SWAN allows for high-resolution visualization of both cerebral veins and arteries in one sequence without application of contrast agent and with significantly shortened scan time compared to the combined scan time of TOF-MRA and TOF-MRV. By use of either MinIP or MIP reconstructions, the arteries can be distinguished from the veins.

  11. Clinical usefulness of MRI and MRA in children with partial epilepsy

    International Nuclear Information System (INIS)

    Zajac, A.; Kacinski, M.; Kubik, A.; Kroczka, S.

    2006-01-01

    Partial epilepsy is a very important problem of epileptology in childhood including clinical and therapeutic aspect especially surgery treatment. The aim of this study is to assess clinical value of neuroimagine techniques (structural MRI, MRI angiography) in partial epilepsy diagnostics in children. The relation between results of examinations with these methods and congenital and acquired risk factors related to partial epilepsy, age of its onset and clinical assessment of patients was analyzed. The study group consisted of 140 children with partial epilepsy hospitalized between 1998 and 2004 in Department of Pediatric Neurology, Collegium Medicum Jagiellonian University, Krakow. The group included 70 girls and 70 boys, the age ranged from 2 months to 17 years. In study group statistical analysis included different factors as which can be related with results of neuroimaging as age, load of pregnancy and birth period, familiar epilepsy, patient's risk factors for appearance of epilepsy, acquired risk factors of epilepsy, results of neurological examination, type of epilepsy, status epilepticus, and signs according epileptic attacks which can be related with neuroimaging results. The primary method of neuroimagine in all patients was structural MRI, in 16 cases Magnetic Resonance Angiography (MRA). The parametric tests (t-student), nonparametric Mann-Whitney's test were used in statistical analysis. The bilateral Fisher test was used to check rate in groups. There was assessed sensitivity, specificity, positive predictive value, negative predictive value; the 95% confidence interval was calculated for these parameters. Abnormalities in neurological examination in children with partial epilepsy were strongly correlated with MRI findings. The structural changes in MRI were found in younger children, whose course of epilepsy was longer than children without MRI changes. Changes in hippocampus ere the most common in children with partial epilepsy with abnormalities in

  12. Globanizatsija v miniature / Aleksandr Ikonnikov

    Index Scriptorium Estoniae

    Ikonnikov, Aleksandr

    2002-01-01

    St. Peterburgi 3000. a. ja Kaasani 1000. a. pühendatud rahvusvaheline konverents tõi meile erinevatest rahvustest, erinevate poliitiliste vaadetega inimesi erinevatest riikidest. Konverents "Suur Volga tee"

  13. "Front" hotshet izvinitsja / Aleksandr Ikonnikov

    Index Scriptorium Estoniae

    Ikonnikov, Aleksandr

    2003-01-01

    Põhiliselt vene rahvusest noori ühendava liikumise "Front" esindajad kavatsevad kohtuda USA suursaadikuga Eestis ja vabandada kevadel suursaatkonna ees vägivallatsemisega lõppenud meeleavalduse pärast

  14. Staraja doroga : [luuletused] / Aleksandr Mezhirov

    Index Scriptorium Estoniae

    Mezhirov, Aleksandr

    2001-01-01

    Sisu: Alter ego ; "Tshto mne delat v "Strele"..." ; "V 41-m, v lessah Pervojanu..." ; Za kogo? Za togo li... ; "Ne zabõvai menja, Moskva moja..." ; "Jesli bõ Zoja i Anna..." ; "Vospominanjami ne mutshai..." ; "Mozhet rodina sõna obidet..." ; Nabokov

  15. "Shmatritsa" piterskogo Goblina / Aleksandr Lukjanov

    Index Scriptorium Estoniae

    Lukjanov, Aleksandr

    2003-01-01

    Peterburi tõlk Dmitri Putshkov on saanud tuntuks omalaadsete tõlkeparoodiatega : tuntud ameerika filmile tehakse oma tõlge-paroodia ja lisatakse vastav muusika. Selliselt töödelduna on saanud kultusfilmist "Matrix" "Shmatritsa". Nende filmide vaatajaskond on organiseerunud "Õige Tõlke Huviliste Klubiks"

  16. Collateral circulation via the circle of Willis in patients with carotid artery steno-occlusive disease: evaluation on 3-T 4D MRA using arterial spin labelling

    International Nuclear Information System (INIS)

    Iryo, Yasuhiko; Hirai, Toshinori; Nakamura, Masanobu; Inoue, Yasuteru; Watanabe, Masaki; Ando, Yukio; Azuma, Minako; Nishimura, Shinichiro; Shigematsu, Yoshinori; Kitajima, Mika; Yamashita, Yasuyuki

    2015-01-01

    Aim: To evaluate whether 3-T four-dimensional (4D) arterial spin-labelling (ASL) -based magnetic resonance angiography (MRA) is useful for assessing the collateral circulation via the circle of Willis in patients with carotid artery steno-occlusive disease. Materials and methods: Institutional review board approval and prior written informed consent from all patients were obtained. The inclusion criteria were fulfilled by 13 patients with carotid artery steno-occlusive disease. All underwent 4D-ASL MRA at 3 T and digital subtraction angiography (DSA). The flow-sensitive alternating inversion recovery (FAIR) preparation scheme with look-locker sampling was used for spin labeling. At 300-ms intervals seven dynamic scans were obtained with a spatial resolution of 0.5×0.5×0.6 mm 3 . The collateral flow via the circle of Willis was read on 4D-ASL MRA and DSA images by two sets of two independent readers each. κ statistics were used to assess interobserver and intermodality agreement. Results: On DSA, collateral flow via the anterior communicating artery (AcomA) was observed in six patients, via the posterior communicating artery (PcomA) in four patients, and via both the AcomA and PcomA in three patients. With respect to the qualitative evaluation of 4D-ASL MRA images, interobserver agreement was excellent for all items (κ=1). 4D-ASL MRA and DSA consensus readings agreed on the type of collateral flow pattern in 10 of the 13 patients (77%). Intermodality agreement was good (κ=0.606; 95% confidence interval (CI): 0.215–0.997). Conclusion: 3 T 4D-ASL MRA may be a useful tool for the evaluation of the collateral circulation in patients with carotid artery steno-occlusive disease. -- Highlights: •3-T 4D-ASL MRA has high spatial and temporal resolution. •There is no need for the use of contrast agents in this technique. •4D-ASL MRA is useful for assessing the collateral flow associated with carotid artery stenosis. •Intermodality agreement between 4D

  17. Usefulness of PC based 3D volume rendering technique in the evaluation of suspected aneurysm on brain MRA

    International Nuclear Information System (INIS)

    Baek, Seung Il; Lee, Ghi Jai; Shim, Jae Chan; Bang, Sun Woo; Ryu, Seok Jong; Kim, Ho Kyun

    2002-01-01

    To evaluated usefulness of volume rending technique using 3D visualization software on PC in patients with suspected intracranial aneurysm on brain MRA. We analyzed prospectively 21 patients with suspected aneurysms on the routine MIP images which were obtained 15 .deg. C increment along axial and sagittal plane, among 135 patients in whom brain MRA was done due to stroke symptoms for recent 5 months. The locations were the anterior communicating artery (A-com) in 8 patients, the posterior communicating artery (P-com) in 3, the ICA bifurcation in 5, the MCA bifurcation in 4, and the basilar tip in one. Male to female ratio was 14:7 and mean age was 62 years. MRA source images were sent to PC through LAN, and the existence of aneurysm was evaluated with volume rendering technique using 3D visualization software on PC. The presence or absence of aneurysm on MIP and volume rendering images was decided by the consensus of two radiologists. We found the aneurysms with volume rendering technique, from 1 patient among 8 patients with suspected aneurysm at A-com and also 1 patient among 3 patients with suspected aneurysm at P=com on routine MIP images. Confirmative angiography and interventional procedures were done in these 2 patients. The causes for mimicking the aneurysm on MIP were flow displacement artifact in 9, normal P-com infundibulum in 2, and overlapped or narrowed vessels in 8 patients, and among them confirmative angiography was done in 2 patient. Volume rendering technique using visualization software on PC is useful to scrutinize the suspected aneurysm on routine MIP images and to avoid further invasive angiography

  18. Simultaneous display of MRA and MPR in detecting vascular compression for trigeminal neuralgia or hemifacial spasm: comparison with oblique sagittal views of MRI

    International Nuclear Information System (INIS)

    Arbab, A.S.; Aoki, S.; Yoshikawa, T.; Kumagai, H.; Araki, T.; Nishiyama, Y.; Nagaseki, Y.; Nukui, H.

    2000-01-01

    A new technique, simultaneous display of magnetic resonance angiography (MRA) and multiplanar reconstruction (MPR), was performed by a workstation to identify the involved vessels in patients with trigeminal neuralgia (TN) or hemifacial spasm (HFS), and the results were compared with those of oblique sagittal MRI technique. Twelve patients with either HFS or TN were prospectively assessed by simultaneous display of MRA and MPR, and oblique sagittal techniques, to point out the neurovascular compression and to identify the involved vessels. Three-dimensional (3D) time-of-flight (TOF) spoiled gradient-echo (SPGR) images were acquired to create MRA and MPR. Oblique sagittal views were also created and displayed on films. A total of 15 vessels in 12 patients were identified as compressing vessels during surgery. Simultaneous display of MRA and MPR technique pointed out the presence of vessels at and/or around root entry/exit zone (REZ) in all 12 patients, but proper identification by the name of the individual vessel was correct in 13 of 15 cases. However, oblique sagittal technique indicated the presence of vessels at and/or around REZ in 11 patients, but only 8 of 14 vessels were correctly identified. Our new method, simultaneous display of MRA-MPR, facilitated correct identification of the involved vessels compared with the oblique sagittal view method. (orig.)

  19. Role of high resolution contrast-enhanced magnetic resonance angiography (HR CeMRA) in management of arterial complications of the renal transplant

    International Nuclear Information System (INIS)

    Ismaeel, M. Maged; Abdel-Hamid, Azza

    2011-01-01

    Introduction: Transplant renal artery (RA) stenosis (TRAS) is the most frequent posttransplantation vascular complication. Contrast enhanced magnetic resonance (CeMRA) angiography has been established as the preferred imaging technique for the evaluation of TRAS because it does not require the use of iodinated contrast material and does not expose the patient to ionizing radiation. Digital subtraction angiography (DSA) is the gold standard in the evaluation of arterial tree of the renal allograft. Aim of the work: This study was carried out to assess the accuracy of CeMRA in the detection of arterial complications after renal transplantation. Patients and methods: Thirty renal transplant patients with suspected arterial complications in which both CeMRA and DSA were performed were included in the study. The HR CeMRA shows 93.7% sensitivity, 80% specificity, 88.2% positive predictive value, 88.9% negative predictive value and 88.5% accuracy. Conclusion: HR CeMRA is an accurate reliable tool in the assessment of arterial complications after renal transplantation. It may replace DSA as a diagnostic modality with reservation of interventional techniques for endovascular treatment of suitable cases.

  20. Role of high resolution contrast-enhanced magnetic resonance angiography (HR CeMRA) in management of arterial complications of the renal transplant

    Energy Technology Data Exchange (ETDEWEB)

    Ismaeel, M. Maged [Suez Canal University (Egypt); Abdel-Hamid, Azza, E-mail: azza4951@hotmail.com [Suez Canal University (Egypt)

    2011-08-15

    Introduction: Transplant renal artery (RA) stenosis (TRAS) is the most frequent posttransplantation vascular complication. Contrast enhanced magnetic resonance (CeMRA) angiography has been established as the preferred imaging technique for the evaluation of TRAS because it does not require the use of iodinated contrast material and does not expose the patient to ionizing radiation. Digital subtraction angiography (DSA) is the gold standard in the evaluation of arterial tree of the renal allograft. Aim of the work: This study was carried out to assess the accuracy of CeMRA in the detection of arterial complications after renal transplantation. Patients and methods: Thirty renal transplant patients with suspected arterial complications in which both CeMRA and DSA were performed were included in the study. The HR CeMRA shows 93.7% sensitivity, 80% specificity, 88.2% positive predictive value, 88.9% negative predictive value and 88.5% accuracy. Conclusion: HR CeMRA is an accurate reliable tool in the assessment of arterial complications after renal transplantation. It may replace DSA as a diagnostic modality with reservation of interventional techniques for endovascular treatment of suitable cases.

  1. Comparison of vessel enhancement algorithms applied to time-of-flight MRA images for cerebrovascular segmentation.

    Science.gov (United States)

    Phellan, Renzo; Forkert, Nils D

    2017-11-01

    Vessel enhancement algorithms are often used as a preprocessing step for vessel segmentation in medical images to improve the overall segmentation accuracy. Each algorithm uses different characteristics to enhance vessels, such that the most suitable algorithm may vary for different applications. This paper presents a comparative analysis of the accuracy gains in vessel segmentation generated by the use of nine vessel enhancement algorithms: Multiscale vesselness using the formulas described by Erdt (MSE), Frangi (MSF), and Sato (MSS), optimally oriented flux (OOF), ranking orientations responses path operator (RORPO), the regularized Perona-Malik approach (RPM), vessel enhanced diffusion (VED), hybrid diffusion with continuous switch (HDCS), and the white top hat algorithm (WTH). The filters were evaluated and compared based on time-of-flight MRA datasets and corresponding manual segmentations from 5 healthy subjects and 10 patients with an arteriovenous malformation. Additionally, five synthetic angiographic datasets with corresponding ground truth segmentation were generated with three different noise levels (low, medium, and high) and also used for comparison. The parameters for each algorithm and subsequent segmentation were optimized using leave-one-out cross evaluation. The Dice coefficient, Matthews correlation coefficient, area under the ROC curve, number of connected components, and true positives were used for comparison. The results of this study suggest that vessel enhancement algorithms do not always lead to more accurate segmentation results compared to segmenting nonenhanced images directly. Multiscale vesselness algorithms, such as MSE, MSF, and MSS proved to be robust to noise, while diffusion-based filters, such as RPM, VED, and HDCS ranked in the top of the list in scenarios with medium or no noise. Filters that assume tubular-shapes, such as MSE, MSF, MSS, OOF, RORPO, and VED show a decrease in accuracy when considering patients with an AVM

  2. Artefacts at a glance: differentiating features of artefactual stenosis from true stenosis at the genu of the petrous internal carotid artery on TOF MRA

    International Nuclear Information System (INIS)

    Lee, S.K.; Ahn, K.J.; Jang, J.H.; Choi, H.S.; Jung, S.L.; Kim, B.S.

    2016-01-01

    Aim: To investigate the distinguishing features of artefactual stenosis from true stenosis at the genu of the petrous internal carotid artery (ICA) on time of flight (TOF) magnetic resonance angiography (MRA). Materials and methods: Both TOF MRA and digital subtraction angiography (DSA) were performed in 65 patients with 74 vessels who demonstrated artefactual stenosis in 43 patients with 50 vessels and true stenosis in 22 patients with 24 vessels. The following findings of the signal loss were compared between the two groups: (1) margin, (2) darkness, (3) the presence of bilaterality, (4) the presence of tandem arterial stenosis, (5) the location of the epicentre, and (6) length. Results: In five out of the six evaluated items, statistically significant differences were present between the two groups (p<0.00 in all five items). Artefactual stenosis more frequently showed signal loss with ill-defined margins (47/50), less darkness compared to the background darkness (46/50), the absence of tandem arterial stenosis (35/50), epicentre at the genu (34/50), and shorter length (2.57 ± 0.68 mm). No significant difference was noted in the presence of bilaterality of signal loss between the two groups (p=0.706). Conclusion: Several MRA features can be useful for suggesting artefactual stenosis rather than true stenosis at the genu of the petrous ICA on TOF MRA. - Highlights: • TOF MRA is increasingly used for the noninvasive evaluation for imaging the cerebrovascular system. • We investigated several artifacts at the genu of petrous ICA on TOF MRA to prevent misinterpretations as true stenosis. • Short segmental, ill-defined, less dark defect at the epicenter of genu without tandem stenosis is more likely an artifact.

  3. Exact monitoring of aortic diameters in Marfan patients without gadolinium contrast: intraindividual comparison of 2D SSFP imaging with 3D CE-MRA and echocardiography

    International Nuclear Information System (INIS)

    Veldhoen, Simon; Behzadi, Cyrus; Derlin, Thorsten; Henes, Frank Oliver; Adam, Gerhard; Bannas, Peter; Rybczinsky, Meike; Kodolitsch, Yskert von; Sheikhzadeh, Sara; Bley, Thorsten Alexander

    2015-01-01

    To assess whether ECG-gated non-contrast 2D steady-state free precession (SSFP) imaging allows for exact monitoring of aortic diameters in Marfan syndrome (MFS) patients using non-ECG-gated contrast-enhanced 3D magnetic resonance angiography (CE-MRA) and echocardiography for intraindividual comparison. Non-ECG-gated CE-MRA and ECG-gated non-contrast SSFP at 1.5 T were prospectively performed in 50 patients. Two readers measured aortic diameters on para-sagittal images identically aligned with the aortic arch at the sinuses of Valsalva, sinotubular junction, ascending/descending aorta and aortic arch. Image quality was assessed on a three-point scale. Aortic root diameters acquired by echocardiography were used as reference. Intra- and interobserver variances were smaller for SSFP at the sinuses of Valsalva (p = 0.002; p = 0.002) and sinotubular junction (p = 0.014; p = 0.043). Image quality was better in SSFP than in CE-MRA at the sinuses of Valsalva (p < 0.0001), sinotubular junction (p < 0.0001) and ascending aorta (p = 0.02). CE-MRA yielded higher diameters than SSFP at the sinuses of Valsalva (mean bias, 2.5 mm; p < 0.0001), and comparison with echocardiography confirmed a higher bias for CE-MRA (7.2 ± 3.4 mm vs. SSFP, 4.7 ± 2.6 mm). ECG-gated non-contrast 2D SSFP imaging provides superior image quality with higher validity compared to non-ECG-gated contrast-enhanced 3D imaging. Since CE-MRA requires contrast agents with potential adverse effects, non-contrast SSFP imaging is an appropriate alternative for exact and riskless aortic monitoring of MFS patients. (orig.)

  4. Exact monitoring of aortic diameters in Marfan patients without gadolinium contrast: intraindividual comparison of 2D SSFP imaging with 3D CE-MRA and echocardiography

    Energy Technology Data Exchange (ETDEWEB)

    Veldhoen, Simon [University Medical Center Wuerzburg, Department of Diagnostic and Interventional Radiology, Bavaria (Germany); University Medical Center Hamburg-Eppendorf, Department of Diagnostic and Interventional Radiology, Hamburg (Germany); Behzadi, Cyrus; Derlin, Thorsten; Henes, Frank Oliver; Adam, Gerhard; Bannas, Peter [University Medical Center Hamburg-Eppendorf, Department of Diagnostic and Interventional Radiology, Hamburg (Germany); Rybczinsky, Meike; Kodolitsch, Yskert von; Sheikhzadeh, Sara [University Medical Center Hamburg-Eppendorf, Department of General and Interventional Cardiology, Hamburg (Germany); Bley, Thorsten Alexander [University Medical Center Wuerzburg, Department of Diagnostic and Interventional Radiology, Bavaria (Germany)

    2014-10-15

    To assess whether ECG-gated non-contrast 2D steady-state free precession (SSFP) imaging allows for exact monitoring of aortic diameters in Marfan syndrome (MFS) patients using non-ECG-gated contrast-enhanced 3D magnetic resonance angiography (CE-MRA) and echocardiography for intraindividual comparison. Non-ECG-gated CE-MRA and ECG-gated non-contrast SSFP at 1.5 T were prospectively performed in 50 patients. Two readers measured aortic diameters on para-sagittal images identically aligned with the aortic arch at the sinuses of Valsalva, sinotubular junction, ascending/descending aorta and aortic arch. Image quality was assessed on a three-point scale. Aortic root diameters acquired by echocardiography were used as reference. Intra- and interobserver variances were smaller for SSFP at the sinuses of Valsalva (p = 0.002; p = 0.002) and sinotubular junction (p = 0.014; p = 0.043). Image quality was better in SSFP than in CE-MRA at the sinuses of Valsalva (p < 0.0001), sinotubular junction (p < 0.0001) and ascending aorta (p = 0.02). CE-MRA yielded higher diameters than SSFP at the sinuses of Valsalva (mean bias, 2.5 mm; p < 0.0001), and comparison with echocardiography confirmed a higher bias for CE-MRA (7.2 ± 3.4 mm vs. SSFP, 4.7 ± 2.6 mm). ECG-gated non-contrast 2D SSFP imaging provides superior image quality with higher validity compared to non-ECG-gated contrast-enhanced 3D imaging. Since CE-MRA requires contrast agents with potential adverse effects, non-contrast SSFP imaging is an appropriate alternative for exact and riskless aortic monitoring of MFS patients. (orig.)

  5. Non-contrast-enhanced 3D volumetric time-resolved MRA combining PCASL for intracranial vessels. President award proceedings

    International Nuclear Information System (INIS)

    Nakamura, Masanobu; Yoneyama, Masami; Tabuchi, Takashi; Tatsuno, Satoshi; Takemura, Atsushi; Obara, Makoto; Takahara, Taro

    2013-01-01

    Hemodynamic information is required for accurate diagnosis, effective treatment, and follow-up examination of numerous cerebrovascular diseases. A recently introduced technique for non-contrast 3-dimensional (3D) volumetric time-resolved magnetic resonance angiography (MRA)-contrast inherent inflow enhanced multi phase angiography (CINEMA)-provides useful qualitative information on the morphologic and dynamic filling of intracranial vessels and requires no catheter insertion or contrast agent. We propose combining CINEMA with pseudo-continuous arterial spin labeling (PCASL). We present a preliminary study of non-contrast time-resolved MRA with time-of-arrival map and discuss its clinical relevance. Studies in all volunteers and patients clearly depicted major intracranial vessels. In patients, CINEMA-PCASL demonstrated the nidus, feeding arteries, and right posterior cerebral artery, and subsequent draining into the superficial venous system was clearly observed with a temporal resolution of 200 ms. Time-of-arrival maps presented the different filling time of every segment vessel in a single colorful image. The expected pattern of delayed transit to more distal vessels is apparent as well as the earlier arrival in central portions of larger vessels. This preliminary study demonstrated the usefulness of the CINEMA-PCASL technique in evaluating the cerebral vasculature. Simultaneous acquisition of high quality temporal and spatial resolutions obviated the need for contrast agent. (author)

  6. Non-contrast-enhanced 3D volumetric time-resolved MRA combining PCASL for intracranial vessels. President award proceedings

    Energy Technology Data Exchange (ETDEWEB)

    Nakamura, Masanobu; Yoneyama, Masami; Tabuchi, Takashi; Tatsuno, Satoshi [Yaesu Clinic, Tokyo (Japan); Takemura, Atsushi; Obara, Makoto [Philips Electronics Japan, Tokyo (Japan); Takahara, Taro [Tokai Univ., Hiratsuka, Kanagawa (Japan)

    2013-02-15

    Hemodynamic information is required for accurate diagnosis, effective treatment, and follow-up examination of numerous cerebrovascular diseases. A recently introduced technique for non-contrast 3-dimensional (3D) volumetric time-resolved magnetic resonance angiography (MRA)-contrast inherent inflow enhanced multi phase angiography (CINEMA)-provides useful qualitative information on the morphologic and dynamic filling of intracranial vessels and requires no catheter insertion or contrast agent. We propose combining CINEMA with pseudo-continuous arterial spin labeling (PCASL). We present a preliminary study of non-contrast time-resolved MRA with time-of-arrival map and discuss its clinical relevance. Studies in all volunteers and patients clearly depicted major intracranial vessels. In patients, CINEMA-PCASL demonstrated the nidus, feeding arteries, and right posterior cerebral artery, and subsequent draining into the superficial venous system was clearly observed with a temporal resolution of 200 ms. Time-of-arrival maps presented the different filling time of every segment vessel in a single colorful image. The expected pattern of delayed transit to more distal vessels is apparent as well as the earlier arrival in central portions of larger vessels. This preliminary study demonstrated the usefulness of the CINEMA-PCASL technique in evaluating the cerebral vasculature. Simultaneous acquisition of high quality temporal and spatial resolutions obviated the need for contrast agent. (author)

  7. High-resolution structural and functional assessments of cerebral microvasculature using 3D Gas ΔR2*-mMRA.

    Science.gov (United States)

    Huang, Chien-Hsiang; Chen, Chiao-Chi V; Siow, Tiing-Yee; Hsu, Sheng-Hsiou S; Hsu, Yi-Hua; Jaw, Fu-Shan; Chang, Chen

    2013-01-01

    The ability to evaluate the cerebral microvascular structure and function is crucial for investigating pathological processes in brain disorders. Previous angiographic methods based on blood oxygen level-dependent (BOLD) contrast offer appropriate visualization of the cerebral vasculature, but these methods remain to be optimized in order to extract more comprehensive information. This study aimed to integrate the advantages of BOLD MRI in both structural and functional vascular assessments. The BOLD contrast was manipulated by a carbogen challenge, and signal changes in gradient-echo images were computed to generate ΔR2* maps. Simultaneously, a functional index representing the regional cerebral blood volume was derived by normalizing the ΔR2* values of a given region to those of vein-filled voxels of the sinus. This method is named 3D gas ΔR2*-mMRA (microscopic MRA). The advantages of using 3D gas ΔR2*-mMRA to observe the microvasculature include the ability to distinguish air-tissue interfaces, a high vessel-to-tissue contrast, and not being affected by damage to the blood-brain barrier. A stroke model was used to demonstrate the ability of 3D gas ΔR2*-mMRA to provide information about poststroke revascularization at 3 days after reperfusion. However, this technique has some limitations that cannot be overcome and hence should be considered when it is applied, such as magnifying vessel sizes and predominantly revealing venous vessels.

  8. View-sharing in keyhole imaging: Partially compressed central k-space acquisition in time-resolved MRA at 3.0 T

    Energy Technology Data Exchange (ETDEWEB)

    Hadizadeh, Dariusch R., E-mail: Dariusch.Hadizadeh@ukb.uni-bonn.de [University of Bonn, Department of Radiology, Sigmund-Freud-Strasse 25, 53127 Bonn (Germany); Gieseke, Juergen [University of Bonn, Department of Radiology, Sigmund-Freud-Strasse 25, 53127 Bonn (Germany); Philips Healthcare, Best (Netherlands); Beck, Gabriele; Geerts, Liesbeth [Philips Healthcare, Best (Netherlands); Kukuk, Guido M. [University of Bonn, Department of Radiology, Sigmund-Freud-Strasse 25, 53127 Bonn (Germany); Bostroem, Azize [Department of Neurosurgery, Sigmund-Freud-Strasse 25, 53127 Bonn, Deutschland (Germany); Urbach, Horst; Schild, Hans H.; Willinek, Winfried A. [University of Bonn, Department of Radiology, Sigmund-Freud-Strasse 25, 53127 Bonn (Germany)

    2011-11-15

    Introduction: Time-resolved contrast-enhanced magnetic resonance (MR) angiography (CEMRA) of the intracranial vasculature has proved its clinical value for the evaluation of cerebral vascular disease in cases where both flow hemodynamics and morphology are important. The purpose of this study was to evaluate a combination of view-sharing with keyhole imaging to increase spatial and temporal resolution of time-resolved CEMRA at 3.0 T. Methods: Alternating view-sharing was combined with randomly segmented k-space ordering, keyhole imaging, partial Fourier and parallel imaging (4DkvsMRA). 4DkvsMRA was evaluated using varying compression factors (80-100) resulting in spatial resolutions ranging from (1.1 x 1.1 x 1.4) to (0.96 x 0.96 x 0.95) mm{sup 3} and temporal resolutions ranging from 586 ms/dynamic scan - 288 ms/dynamic scan in three protocols in 10 healthy volunteers and seven patients (17 subjects). DSA correlation was available in four patients with cerebral arteriovenous malformations (cAVMs) and one patient with cerebral teleangiectasia. Results: 4DkvsMRA was successfully performed in all subjects and showed clear depiction of arterial and venous phases with diagnostic image quality. At the maximum view-sharing compression factor (=100), a 'flickering' artefact was observed. Conclusion: View-sharing in keyhole imaging allows for increased spatial and temporal resolution in time-resolved MRA.

  9. A systematic review and meta-analysis of diagnostic test of MRA versus MRI for detection superior labrum anterior to posterior lesions type II-VII

    International Nuclear Information System (INIS)

    Arirachakaran, Alisara; Pituckanotai, Kwanchai; Boonard, Manusak; Chaijenkij, Kornkit; Prommahachai, Akom; Kongtharvonskul, Jatupon

    2017-01-01

    To determine the diagnostic performance of magnetic resonance arthrography (MRA) and magnetic resonance imaging (MRI) in superior labrum anterior to posterior lesions (type II-VII) of the shoulder. PubMed and Scopus search engines, an electronic search of articles was performed from inception to February 19, 2016. Diagnostic performance of index tests was compared by the summary area under receiver operator characteristic curve (AUROC). In all, 117 of 493 studies were eligible and 32 studies (2,013 shoulders) and 11 studies (1,498 shoulders) were evaluated with MRA and MRI. The summary sensitivity, specificity, likelihood ratio (positive and negative) and AUROC were 0.87 (95 % confidence interval, CI: 0.82, 0.91), 0.92 (95 %CI: 0.85, 0.95), 10.28 (95 %CI: 5.84, 18.08), 0.14 (95 %CI: 0.10, 0.20) and 0.94 (95 %CI: 0.92, 0.96) respectively for MRA, and 0.76 (95 %CI: 0.61, 0.86), 0.87 (95 %CI: 0.71, 0.95), 5.89 (95 %CI: 2.5, 13.86), 0.28 (95 %CI: 0.17, 0.47) and 0.94 (95 %CI: 0.92, 0.96) respectively for MRI. The diagnostic performance of MRA was superior to MRI by both direct and indirect comparisons for the detection of SLAP lesions. (orig.)

  10. A systematic review and meta-analysis of diagnostic test of MRA versus MRI for detection superior labrum anterior to posterior lesions type II-VII

    Energy Technology Data Exchange (ETDEWEB)

    Arirachakaran, Alisara; Pituckanotai, Kwanchai [Police General Hospital, Orthopedics Department, Bangkok (Thailand); Boonard, Manusak [Khon Kean University, Department of Orthopaedics, Faculty of Medicine, Khonkaen (Thailand); Chaijenkij, Kornkit [Mahidol University, Orthopedics Department, College of Sports Science and Technology, Bangkok (Thailand); Prommahachai, Akom [Udon Thani Hospital, Orthopedic Department, Udonthani (Thailand); Kongtharvonskul, Jatupon [Faculty of Medicine Ramathibodi Hospital, Section for Clinical Epidemiology and Biostatistics, Bangkok (Thailand)

    2017-02-15

    To determine the diagnostic performance of magnetic resonance arthrography (MRA) and magnetic resonance imaging (MRI) in superior labrum anterior to posterior lesions (type II-VII) of the shoulder. PubMed and Scopus search engines, an electronic search of articles was performed from inception to February 19, 2016. Diagnostic performance of index tests was compared by the summary area under receiver operator characteristic curve (AUROC). In all, 117 of 493 studies were eligible and 32 studies (2,013 shoulders) and 11 studies (1,498 shoulders) were evaluated with MRA and MRI. The summary sensitivity, specificity, likelihood ratio (positive and negative) and AUROC were 0.87 (95 % confidence interval, CI: 0.82, 0.91), 0.92 (95 %CI: 0.85, 0.95), 10.28 (95 %CI: 5.84, 18.08), 0.14 (95 %CI: 0.10, 0.20) and 0.94 (95 %CI: 0.92, 0.96) respectively for MRA, and 0.76 (95 %CI: 0.61, 0.86), 0.87 (95 %CI: 0.71, 0.95), 5.89 (95 %CI: 2.5, 13.86), 0.28 (95 %CI: 0.17, 0.47) and 0.94 (95 %CI: 0.92, 0.96) respectively for MRI. The diagnostic performance of MRA was superior to MRI by both direct and indirect comparisons for the detection of SLAP lesions. (orig.)

  11. View-sharing in keyhole imaging: Partially compressed central k-space acquisition in time-resolved MRA at 3.0 T

    International Nuclear Information System (INIS)

    Hadizadeh, Dariusch R.; Gieseke, Juergen; Beck, Gabriele; Geerts, Liesbeth; Kukuk, Guido M.; Bostroem, Azize; Urbach, Horst; Schild, Hans H.; Willinek, Winfried A.

    2011-01-01

    Introduction: Time-resolved contrast-enhanced magnetic resonance (MR) angiography (CEMRA) of the intracranial vasculature has proved its clinical value for the evaluation of cerebral vascular disease in cases where both flow hemodynamics and morphology are important. The purpose of this study was to evaluate a combination of view-sharing with keyhole imaging to increase spatial and temporal resolution of time-resolved CEMRA at 3.0 T. Methods: Alternating view-sharing was combined with randomly segmented k-space ordering, keyhole imaging, partial Fourier and parallel imaging (4DkvsMRA). 4DkvsMRA was evaluated using varying compression factors (80-100) resulting in spatial resolutions ranging from (1.1 x 1.1 x 1.4) to (0.96 x 0.96 x 0.95) mm 3 and temporal resolutions ranging from 586 ms/dynamic scan - 288 ms/dynamic scan in three protocols in 10 healthy volunteers and seven patients (17 subjects). DSA correlation was available in four patients with cerebral arteriovenous malformations (cAVMs) and one patient with cerebral teleangiectasia. Results: 4DkvsMRA was successfully performed in all subjects and showed clear depiction of arterial and venous phases with diagnostic image quality. At the maximum view-sharing compression factor (=100), a 'flickering' artefact was observed. Conclusion: View-sharing in keyhole imaging allows for increased spatial and temporal resolution in time-resolved MRA.

  12. Contribution of the Pmra Promoter to Expression of Genes in the Escherichia coli mra Cluster of Cell Envelope Biosynthesis and Cell Division Genes

    Science.gov (United States)

    Mengin-Lecreulx, Dominique; Ayala, Juan; Bouhss, Ahmed; van Heijenoort, Jean; Parquet, Claudine; Hara, Hiroshi

    1998-01-01

    Recently, a promoter for the essential gene ftsI, which encodes penicillin-binding protein 3 of Escherichia coli, was precisely localized 1.9 kb upstream from this gene, at the beginning of the mra cluster of cell division and cell envelope biosynthesis genes (H. Hara, S. Yasuda, K. Horiuchi, and J. T. Park, J. Bacteriol. 179:5802–5811, 1997). Disruption of this promoter (Pmra) on the chromosome and its replacement by the lac promoter (Pmra::Plac) led to isopropyl-β-d-thiogalactopyranoside (IPTG)-dependent cells that lysed in the absence of inducer, a defect which was complemented only when the whole region from Pmra to ftsW, the fifth gene downstream from ftsI, was provided in trans on a plasmid. In the present work, the levels of various proteins involved in peptidoglycan synthesis and cell division were precisely determined in cells in which Pmra::Plac promoter expression was repressed or fully induced. It was confirmed that the Pmra promoter is required for expression of the first nine genes of the mra cluster: mraZ (orfC), mraW (orfB), ftsL (mraR), ftsI, murE, murF, mraY, murD, and ftsW. Interestingly, three- to sixfold-decreased levels of MurG and MurC enzymes were observed in uninduced Pmra::Plac cells. This was correlated with an accumulation of the nucleotide precursors UDP–N-acetylglucosamine and UDP–N-acetylmuramic acid, substrates of these enzymes, and with a depletion of the pool of UDP–N-acetylmuramyl pentapeptide, resulting in decreased cell wall peptidoglycan synthesis. Moreover, the expression of ftsZ, the penultimate gene from this cluster, was significantly reduced when Pmra expression was repressed. It was concluded that the transcription of the genes located downstream from ftsW in the mra cluster, from murG to ftsZ, is also mainly (but not exclusively) dependent on the Pmra promoter. PMID:9721276

  13. Detection of cerebrovascular disease in patients with sickle cell disease using transcranial Doppler sonography: correlation with MRI, MRA and conventional angiography

    Energy Technology Data Exchange (ETDEWEB)

    Verlhac, S. [Service de Radiologie, Centre Hospitalier Intercommunal, 94 - Creteil (France); Bernaudin, F. [Service de Pediatrie, Centre Hospitalier Intercommunal, 94 - Creteil (France); Tortrat, D. [Association Claude Bernard, 75 - Paris (France); Brugieres, P. [Service de Neuroradiologie, Hopital Henri Mondor, 94 - Creteil (France); Mage, K. [Service de Radiologie, Centre Hospitalier Intercommunal, 94 - Creteil (France); Gaston, A. [Service de Neuroradiologie, Hopital Henri Mondor, 94 - Creteil (France); Reinert, P. [Service de Pediatrie, Centre Hospitalier Intercommunal, 94 - Creteil (France)

    1995-11-01

    A prospective study of 58 patients with sickle cell disease (SCD) by transcranial Doppler sonography (TCD) included both MRI and MRA in patients over 7 years of age and those with abnormal TCD. Arteriography was performed in cases where a stenosis was suspected on TCD. Middle cerebral artery (MCA) and basilar artery (BA) velocities were significantly higher in the sickle cell hemoglobin SS group than in the hemoglobin SC group. Patients with a MCA mean velocity of over 1.90 m/s had stenoses found by arteriography. Patients with unilaterally undetectable MCA flow had experienced a stroke and MCA thrombosis was confirmed at MRA and arteriography. We concluded that TCD is valuable in detecting arterial stenosis in SCD and will lead to consideration of these patients for intensive therapy, such as bone marrow transplantation (BMT) or transfusion regimes. (orig.)

  14. Detection of cerebrovascular disease in patients with sickle cell disease using transcranial Doppler sonography: correlation with MRI, MRA and conventional angiography

    International Nuclear Information System (INIS)

    Verlhac, S.; Bernaudin, F.; Tortrat, D.; Brugieres, P.; Mage, K.; Gaston, A.; Reinert, P.

    1995-01-01

    A prospective study of 58 patients with sickle cell disease (SCD) by transcranial Doppler sonography (TCD) included both MRI and MRA in patients over 7 years of age and those with abnormal TCD. Arteriography was performed in cases where a stenosis was suspected on TCD. Middle cerebral artery (MCA) and basilar artery (BA) velocities were significantly higher in the sickle cell hemoglobin SS group than in the hemoglobin SC group. Patients with a MCA mean velocity of over 1.90 m/s had stenoses found by arteriography. Patients with unilaterally undetectable MCA flow had experienced a stroke and MCA thrombosis was confirmed at MRA and arteriography. We concluded that TCD is valuable in detecting arterial stenosis in SCD and will lead to consideration of these patients for intensive therapy, such as bone marrow transplantation (BMT) or transfusion regimes. (orig.)

  15. Persistent trigeminal artery/persistent trigeminal artery variant and coexisting variants of the head and neck vessels diagnosed using 3 T MRA

    International Nuclear Information System (INIS)

    Bai, M.; Guo, Q.; Li, S.

    2013-01-01

    Aim: To report the prevalence and characteristic features of persistent trigeminal artery (PTA), PTA variant (PTAV), and other variants of the head and neck vessels, identified using magnetic resonance angiography (MRA). Materials and methods: The three-dimensional (3D) time of flight (TOF) MRA and 3D contrast-enhanced (CE) MRA images of 6095 consecutive patients who underwent 3 T MRA at Liaocheng People's Hospital from 1 September 2008 through 31 May 2012 were retrospectively reviewed and analysed. Thirty-two patients were excluded because of suboptimal image quality or internal carotid artery (ICA) occlusion. Results: The prevalence of both PTA and PTAV was 0.63% (PTA, 26 cases; PTAV, 12 cases). The prevalence of coexisting variants of the head and neck vessels in cases of PTA/PTAV was 52.6% (20 of 38 cases). The vascular variants that coexisted with cases of PTA/PTAV were as follows: the intracranial arteries varied in 10 cases, the origin of the supra-aortic arteries varied in nine cases, the vertebral artery (VA) varied in 14 cases, and six cases displayed fenestrations. Fifteen of the 20 cases contained more than two types of variants. Conclusion: The prevalence of both PTA and PTAV was 0.63%. Although PTA and PTAV are rare vascular variants, they frequently coexist with other variants of the head and neck vessels. Multiple vascular variations can coexist in a single patient. Recognizing PTA, PTAV, and other variants of the head and neck vessels is crucial when planning a neuroradiological intervention or surgery. Recognizing the medial PTA is very important in clinical practice when performing trans-sphenoidal surgery on the pituitary as failure to do so could result in massive haemorrhage

  16. The cell wall and cell division gene cluster in the Mra operon of Pseudomonas aeruginosa: cloning, production, and purification of active enzymes.

    Science.gov (United States)

    Azzolina, B A; Yuan, X; Anderson, M S; El-Sherbeini, M

    2001-04-01

    We have cloned the Pseudomonas aeruginosa cell wall biosynthesis and cell division gene cluster that corresponds to the mra operon in the 2-min region of the Escherichia coli chromosome. The organization of the two chromosomal regions in P. aeruginosa and E. coli is remarkably similar with the following gene order: pbp3/pbpB, murE, murF, mraY, murD, ftsW, murG, murC, ddlB, ftsQ, ftsA, ftsZ, and envA/LpxC. All of the above P. aeruginosa genes are transcribed from the same strand of DNA with very small, if any, intragenic regions, indicating that these genes may constitute a single operon. All five amino acid ligases, MurC, MurD, MurE, MurF, and DdlB, in addition to MurG and MraY were cloned in expression vectors. The four recombinant P. aeruginosa Mur ligases, MurC, MurD, MurE, and MurF were overproduced in E. coli and purified as active enzymes. Copyright 2001 Academic Press.

  17. Time-resolved magnetic resonance angiography (MRA) at 3.0 Tesla for evaluation of hemodynamic characteristics of vascular malformations: description of distinct subgroups.

    Science.gov (United States)

    Hammer, Simone; Uller, Wibke; Manger, Florentine; Fellner, Claudia; Zeman, Florian; Wohlgemuth, Walter A

    2017-01-01

    Quantitative evaluation of hemodynamic characteristics of arteriovenous and venous malformations using time-resolved magnetic resonance angiography (MRA) at 3.0 Tesla. Time-resolved MRA with interleaved stochastic trajectories (TWIST) at 3.0 Tesla was studied in 83 consecutive patients with venous malformations (VM) and arteriovenous malformations (AVM). Enhancement characteristics were calculated as percentage increase of signal intensity above baseline over time. Maximum percentage signal intensity increase (signal max ), time intervals between onset of arterial enhancement and lesion enhancement (t onset ), and time intervals between beginning of lesion enhancement and maximum percentage of lesion enhancement (t max ) were analyzed. All AVMs showed a high-flow hemodynamic pattern. Two significantly different (p 3.0 Tesla provides hemodynamic characterization of vascular malformations. VMs can be subclassified into two hemodynamic subgroups due to presence or absence of AVFs. • Time-resolved MRA at 3.0 Tesla provides quantitative hemodynamic characterization of vascular malformations. • Malformations significantly differ in time courses of enhancement and signal intensity increase. • AVMs show a distinctive high-flow hemodynamic pattern. • Two significantly different types of VMs emerged: VMs with and without AVFs.

  18. Transcranial Doppler, MRA, and MRI as a screening examination for cerebrovascular disease in patients with sickle cell anemia: an 8-year study

    Energy Technology Data Exchange (ETDEWEB)

    Seibert, J.J.; Glasier, C.M.; Allison, J.W.; James, C.A.; Kinder, D.L.; Cox, K.S.; Lairry, F.; Graves, R.A. [Arkansas Children`s Hospital, Little Rock, AR (United States). Dept. of Radiology; Kirby, R.S.; Flick, E.L. [Center for Ambulatory Research, Univ. of Arkansas for Medical Sciences, Little Rock, AR (United States); Becton, D.L.; Jackson, F.J. [Dept. of Hematology, Univ. of Arkansas for Medical Sciences, Little Rock, AR (United States)

    1998-03-01

    Objective. The authors previously reported five transcranial Doppler ultrasonography (TCD) findings as significant in detecting clinical cerebrovascular disease in a 4-year study in patients with sickle cell disease. This is a follow-up to evaluate the validity of the original findings over another 4-year period during which the study population doubled. A clinical follow-up of the original asymptomatic sickle cell patients with positive TCD, MRA, and MRI was also made. Results. Of the 4 out of original 46 control patients in 1992 who had positive MRA and TCD, 3 have subsequently had clinical stroke. None of the 9 original patients with positive TCD and positive MRI but negative MRA have developed stroke. All five original TCD indicators of disease were still significant (P<0.05) for detecting clinical disease: maximum velocity in ophthalmic artery (OA)>35 cm/s, mean velocity in middle cerebral artery (MCA) >170 cm/s, resistive index (RI) in OA<50, velocity in OA greater than in MCA, and velocity in posterior cerebral (PCA), vertebral, or basilar arteries greater than in MCA. Four additional factors were also significant: turbulence, PCA or ACA without MCA, RI<30, and maximum velocity in MCA>200 cm/s. (orig.)

  19. Time-resolved magnetic resonance angiography (MRA) at 3.0 Tesla for evaluation of hemodynamic characteristics of vascular malformations: description of distinct subgroups

    Energy Technology Data Exchange (ETDEWEB)

    Hammer, Simone; Fellner, Claudia; Wohlgemuth, Walter A. [University Hospital Regensburg, Department of Radiology, Regensburg (Germany); Uller, Wibke [Boston Children' s Hospital and Harvard Medical School, Division of Vascular and Interventional Radiology, Boston, MA (United States); University Hospital Regensburg, Department of Radiology, Regensburg (Germany); Manger, Florentine [University Hospital Wuerzburg, Department of Nuclear Medicine, Wuerzburg (Germany); Zeman, Florian [University Hospital Regensburg, Center for Clinical Trials, Regensburg (Germany)

    2017-01-15

    Quantitative evaluation of hemodynamic characteristics of arteriovenous and venous malformations using time-resolved magnetic resonance angiography (MRA) at 3.0 Tesla. Time-resolved MRA with interleaved stochastic trajectories (TWIST) at 3.0 Tesla was studied in 83 consecutive patients with venous malformations (VM) and arteriovenous malformations (AVM). Enhancement characteristics were calculated as percentage increase of signal intensity above baseline over time. Maximum percentage signal intensity increase (signal{sub max}), time intervals between onset of arterial enhancement and lesion enhancement (t{sub onset}), and time intervals between beginning of lesion enhancement and maximum percentage of lesion enhancement (t{sub max}) were analyzed. All AVMs showed a high-flow hemodynamic pattern. Two significantly different (p < 0.001) types of venous malformations emerged: VMs with arteriovenous fistulas (AVF) (median signal{sub max} 737 %, IQR [interquartile range] = 511 - 1182 %; median t{sub onset} 5 s, IQR = 5 - 10 s; median t{sub max} 35 s, IQR = 26 - 40 s) and without AVFs (median signal{sub max} 284 %, IQR = 177-432 %; median t{sub onset} 23 s, IQR = 15 - 30 s; median t{sub max} 60 s, IQR = 55 - 75 s). Quantitative evaluation of time-resolved MRA at 3.0 Tesla provides hemodynamic characterization of vascular malformations. VMs can be subclassified into two hemodynamic subgroups due to presence or absence of AVFs. (orig.)

  20. Supra-aortic arteries: three-dimensional time-resolved k-t BLAST contrast-enhanced MRA using a nondedicated body coil at 3 tesla in acute ischemic stroke.

    Science.gov (United States)

    Ferré, Jean-Christophe; Raoult, Hélène; Breil, Stéphane; Carsin-Nicol, Béatrice; Ronzière, Thomas; Gauvrit, Jean-Yves

    2014-11-01

    To assess the image quality and diagnostic performance achieved by using supra-aortic 3D-TR-CE-k-t BLAST MRA and a nondedicated body coil as compared with conventional CE-MRA in patients with acute ischemic stroke. In this prospective study, 36 consecutive patients with a suspected acute ischemic stroke underwent both k-t BLAST MRA and conventional CE-MRA. Image quality was assessed using visual and quantitative criteria and the techniques were compared. Both techniques were compared for degree of visual and quantitative measurement of carotid stenosis. Delineation of vessel lumen and overall diagnostic confidence were significantly better with CE-MRA, respectively 3.4 ± 0.5 and 3.3 ± 0.6 (mean score ± SD), than with k-t BLAST MRA, respectively 2.8 ± 0.4 and 2.9 ± 0.5 (P coil offering and dynamic information was a effective diagnostic tool for detection and characterization of carotid stenosis. © 2013 Wiley Periodicals, Inc.

  1. A Proposal of a Mass Appraisal System in Greece with CAMA System: Evaluating GWR and MRA techniques in Thessaloniki Municipality

    Directory of Open Access Journals (Sweden)

    Dimopoulos Thomas

    2016-01-01

    Full Text Available Property tax in Greece is levied since 1985 not on Market Values but on the “objective value” of the properties as it is defined by the Ministry of Economics. It forms a non-flexible system, with market-irrelevant and unrealistic values, inducing land-policy practices and potential political cost to each periodical update. Furthermore, instead of adjusting taxation levels to the current economic reality, the real estate market is experiencing further burdening through approximately 40 different property taxes and levies, leading to further shrinking and depreciation. The authors believe that a fairer taxation system could significantly assist the property sector in Greece. Thus, through this paper and by studying and analyzing best practices from other countries, they propose models that can be applied with the use of existing data in Greece. This work aims to identify the critical parameters that affecting property values in Thessaloniki to create a Market Value forecasting tool for a fairer taxation system, to highlight the importance of a GIS system for this purpose and to compare the results of MRA with the use of SPSS with those of GWR in ArcGIS environment. For the purposes of this study, the Municipality of Thessaloniki was chosen due to its very well organized portal with significant and well organized geographical data and because authors manage to access some data from the Central Bank of Greece, regarding property valuations.

  2. A Proposal of a Mass Appraisal System in Greece with CAMA System: Evaluating GWR and MRA techniques in Thessaloniki Municipality

    Science.gov (United States)

    Dimopoulos, Thomas; Moulas, Alexandros

    2017-01-01

    Property tax in Greece is levied since 1985 not on Market Values but on the "objective value" of the properties as it is defined by the Ministry of Economics. It forms a non-flexible system, with market-irrelevant and unrealistic values, inducing land-policy practices and potential political cost to each periodical update. Furthermore, instead of adjusting taxation levels to the current economic reality, the real estate market is experiencing further burdening through approximately 40 different property taxes and levies, leading to further shrinking and depreciation. The authors believe that a fairer taxation system could significantly assist the property sector in Greece. Thus, through this paper and by studying and analyzing best practices from other countries, they propose models that can be applied with the use of existing data in Greece. This work aims to identify the critical parameters that affecting property values in Thessaloniki to create a Market Value forecasting tool for a fairer taxation system, to highlight the importance of a GIS system for this purpose and to compare the results of MRA with the use of SPSS with those of GWR in ArcGIS environment. For the purposes of this study, the Municipality of Thessaloniki was chosen due to its very well organized portal with significant and well organized geographical data and because authors manage to access some data from the Central Bank of Greece, regarding property valuations.

  3. A Proposal of a Mass Appraisal System in Greece with CAMA System: Evaluating GWR and MRA techniques in Thessaloniki Municipality

    Science.gov (United States)

    Dimopoulos, Thomas; Moulas, Alexandros

    2016-01-01

    Property tax in Greece is levied since 1985 not on Market Values but on the "objective value" of the properties as it is defined by the Ministry of Economics. It forms a non-flexible system, with market-irrelevant and unrealistic values, inducing land-policy practices and potential political cost to each periodical update. Furthermore, instead of adjusting taxation levels to the current economic reality, the real estate market is experiencing further burdening through approximately 40 different property taxes and levies, leading to further shrinking and depreciation. The authors believe that a fairer taxation system could significantly assist the property sector in Greece. Thus, through this paper and by studying and analyzing best practices from other countries, they propose models that can be applied with the use of existing data in Greece. This work aims to identify the critical parameters that affecting property values in Thessaloniki to create a Market Value forecasting tool for a fairer taxation system, to highlight the importance of a GIS system for this purpose and to compare the results of MRA with the use of SPSS with those of GWR in ArcGIS environment. For the purposes of this study, the Municipality of Thessaloniki was chosen due to its very well organized portal with significant and well organized geographical data and because authors manage to access some data from the Central Bank of Greece, regarding property valuations.

  4. Differentiating aneurysm from infundibular dilatation by volume rendering MRA. Techniques for improving depiction of the posterior communicating and anterior choroidal arteries

    Energy Technology Data Exchange (ETDEWEB)

    Kato, Takaaki; Ito, Takeo; Hasunuma, Masahiro; Sakamoto, Yasuo; Kohama, Ikuhide; Yonemori, Terutake; Izumo, Masaki [Hakodate Shintoshi Hospital, Hokkaido (Japan)

    2002-12-01

    With the spread of brain dock procedures, non-invasive magnetic resonance angiography (MRA) is being utilized to broadly screen for brain blood vessel diseases. However, diagnosis of cerebral aneurysm can be difficult by routine MRA. In particular, differentiating aneurysms and infundibular dilatations (IDS) of the posterior communicating artery (PCoA) and anterior choroidal artery (AChA) at their bifurcations with the internal carotid artery (ICA) is extremely difficult and additional studies are frequently necessary. In this situation, three-dimensional computed tomography angiography (3D-CTA) and cerebral angiography have been utilized, but both techniques are invasive. Furthermore, images from cerebral angiography are only two-dimensional, and 3D-CTA requires differentiation between aneurysm and ID by observing configurational changes at the apex of the protrusion and by following gradual changes to the threshold. We therefore undertook the following steps to improve both depiction of the PCoA and AChA and differential diagnosis between aneurysm and ID: reduced slice thickness and increased number of excitations; utilized volume rendering methods to construct images; lowered thresholds for the beginning of the PCoA and AChA arteries, which represent the regions of interest. In all 11 cases that we operated on, cerebral aneurysms were diagnosed correctly and the minimum neck diameter of the cerebral aneurysm was 1.2 mm. In addition, the number of AChAs and PCoAs present in target MRA and in operational views were evaluated. In one case with an AChA aneurysm, a PCoA was not detected by target MRA, because the ICA deviated posterolaterally and pushed the PCoA to the posterior clinoid process, and blood flow was poor in operational views. In another 2 cases with AChA aneurysms, only one AChA was described in target MRA, whereas two aneurysms were present. However, one of these had a diameter less than 1 mm. In conclusion, this method offers an extremely useful aid

  5. Differentiating aneurysm from infundibular dilatation by volume rendering MRA. Techniques for improving depiction of the posterior communicating and anterior choroidal arteries

    International Nuclear Information System (INIS)

    Kato, Takaaki; Ito, Takeo; Hasunuma, Masahiro; Sakamoto, Yasuo; Kohama, Ikuhide; Yonemori, Terutake; Izumo, Masaki

    2002-01-01

    With the spread of brain dock procedures, non-invasive magnetic resonance angiography (MRA) is being utilized to broadly screen for brain blood vessel diseases. However, diagnosis of cerebral aneurysm can be difficult by routine MRA. In particular, differentiating aneurysms and infundibular dilatations (IDS) of the posterior communicating artery (PCoA) and anterior choroidal artery (AChA) at their bifurcations with the internal carotid artery (ICA) is extremely difficult and additional studies are frequently necessary. In this situation, three-dimensional computed tomography angiography (3D-CTA) and cerebral angiography have been utilized, but both techniques are invasive. Furthermore, images from cerebral angiography are only two-dimensional, and 3D-CTA requires differentiation between aneurysm and ID by observing configurational changes at the apex of the protrusion and by following gradual changes to the threshold. We therefore undertook the following steps to improve both depiction of the PCoA and AChA and differential diagnosis between aneurysm and ID: reduced slice thickness and increased number of excitations; utilized volume rendering methods to construct images; lowered thresholds for the beginning of the PCoA and AChA arteries, which represent the regions of interest. In all 11 cases that we operated on, cerebral aneurysms were diagnosed correctly and the minimum neck diameter of the cerebral aneurysm was 1.2 mm. In addition, the number of AChAs and PCoAs present in target MRA and in operational views were evaluated. In one case with an AChA aneurysm, a PCoA was not detected by target MRA, because the ICA deviated posterolaterally and pushed the PCoA to the posterior clinoid process, and blood flow was poor in operational views. In another 2 cases with AChA aneurysms, only one AChA was described in target MRA, whereas two aneurysms were present. However, one of these had a diameter less than 1 mm. In conclusion, this method offers an extremely useful aid

  6. The value of true-FISP sequence added to conventional gadolinium-enhanced MRA of abdominal aorta and its major branches

    Energy Technology Data Exchange (ETDEWEB)

    Iozzelli, Andrea [University of Milan School of Medicine, Department of Medical and Surgical Sciences, Radiology Unit, IRCCS Policlinico San Donato, via Morandi 30, 20097 San Donato Milanese, Milan (Italy)], E-mail: andrea.iozzelli@poste.it; D' Orta, Giovanni [University of Milan School of Medicine, Department of Medical and Surgical Sciences, Radiology Unit, IRCCS Policlinico San Donato, via Morandi 30, 20097 San Donato Milanese, Milan (Italy)], E-mail: ammos@tiscali.it; Aliprandi, Alberto [University of Milan School of Medicine, Department of Medical and Surgical Sciences, Radiology Unit, IRCCS Policlinico San Donato, via Morandi 30, 20097 San Donato Milanese, Milan (Italy)], E-mail: a.aliprandi@grupposandonato.it; Secchi, Francesco [University of Milan School of Medicine, Department of Medical and Surgical Sciences, Radiology Unit, IRCCS Policlinico San Donato, via Morandi 30, 20097 San Donato Milanese, Milan (Italy)], E-mail: francisecchi@virgilio.it; Di Leo, Giovanni [University of Milan School of Medicine, Department of Medical and Surgical Sciences, Radiology Unit, IRCCS Policlinico San Donato, via Morandi 30, 20097 San Donato Milanese, Milan (Italy)], E-mail: gianni.dileo77@virgilio.it; Sardanelli, Francesco [University of Milan School of Medicine, Department of Medical and Surgical Sciences, Radiology Unit, IRCCS Policlinico San Donato, via Morandi 30, 20097 San Donato Milanese, Milan (Italy)], E-mail: f.sardanelli@grupposandonato.it

    2009-12-15

    To test true-fast imaging with steady-state precession (true-FISP) added to gadolinium-based MR angiography (Gd-MRA) for imaging abdominal aorta and major abdominal vessels, 35 consecutive patients (age 67 {+-} 11 years) with known or suspected abdominal and/or peripheral vascular disease were studied with sagittal and axial 2D true-FISP during free breathing and coronal 3D fast low-angle shot (FLASH) Gd-MRA (breath-holding, 0.2 mmol/kg of Gd-DOTA at 2 ml/s). We evaluated: suprarenal aorta, celiac trunk, superior mesenteric artery, right renal artery, left renal artery, infrarenal aorta, inferior mesenteric artery, aortic bifurcation/common iliac arteries, lumbar arteries and aortic atheromasia. The possible presence of accessory renal arteries, collateral vasculature and vascular prosthesis/stent was evaluated. A quality four-point score was assigned to each item on both sequences, from 0 (not visible) to 3 (good-to-excellent image quality) and Wilcoxon test was used. Main diagnoses resulted: normal or atheromasic aorta (n = 25); aortic aneurysm (n = 2); patent aorto-iliac surgical prosthesis (n = 2); patent vascular iliac stent (n = 2); aneurysm of iliac artery (n = 1); patent aortic endovascular prosthesis (n = 1); patent aorto-femural bypass (n = 1) and aorto-iliac surgical prosthesis endoleak (n = 1). We also found three patients with accessory renal arteries, two with collateral circulation, and three with surgical aorto-iliac prosthesis. The score of true-FISP (25.9 {+-} 4.1, median 27) was significantly higher (p = 0.003) than that of Gd-MRA (23.9 {+-} 3.6, median 24). True-FISP was superior for visualizing inferior mesenteric artery (score 2.5 {+-} 1.1 vs. 1.0 {+-} 1.4; p < 0.001) and atheromasic plaques (2.5 {+-} 1.1 vs. 1.2 {+-} 1.1; p < 0.001). One collateral vasculature was demonstrated only with Gd-MRA. Summarizing, true-FISP is a power and fast non-breath-hold sequence to be added to Gd-MRA, obtaining an information increase.

  7. High-resolution, time-resolved MRA provides superior definition of lower-extremity arterial segments compared to 2D time-of-flight imaging.

    Science.gov (United States)

    Thornton, F J; Du, J; Suleiman, S A; Dieter, R; Tefera, G; Pillai, K R; Korosec, F R; Mistretta, C A; Grist, T M

    2006-08-01

    To evaluate a novel time-resolved contrast-enhanced (CE) projection reconstruction (PR) magnetic resonance angiography (MRA) method for identifying potential bypass graft target vessels in patients with Class II-IV peripheral vascular disease. Twenty patients (M:F = 15:5, mean age = 58 years, range = 48-83 years), were recruited from routine MRA referrals. All imaging was performed on a 1.5 T MRI system with fast gradients (Signa LX; GE Healthcare, Waukesha, WI). Images were acquired with a novel technique that combined undersampled PR with a time-resolved acquisition to yield an MRA method with high temporal and spatial resolution. The method is called PR hyper time-resolved imaging of contrast kinetics (PR-hyperTRICKS). Quantitative and qualitative analyses were used to compare two-dimensional (2D) time-of-flight (TOF) and PR-hyperTRICKS in 13 arterial segments per lower extremity. Statistical analysis was performed with the Wilcoxon signed-rank test. Fifteen percent (77/517) of the vessels were scored as missing or nondiagnostic with 2D TOF, but were scored as diagnostic with PR-hyperTRICKS. Image quality was superior with PR-hyperTRICKS vs. 2D TOF (on a four-point scale, mean rank = 3.3 +/- 1.2 vs. 2.9 +/- 1.2, P < 0.0001). PR-hyperTRICKS produced images with high contrast-to-noise ratios (CNR) and high spatial and temporal resolution. 2D TOF images were of inferior quality due to moderate spatial resolution, inferior CNR, greater flow-related artifacts, and absence of temporal resolution. PR-hyperTRICKS provides superior preoperative assessment of lower limb ischemia compared to 2D TOF.

  8. Dynamic CT and MRA findings of a case of portopulmonary venous anastomosis (PPVA) in a patient with portal hypertension: a case report and review of the literature

    International Nuclear Information System (INIS)

    Ko, Jeong Min; Ahn, Myeong Im; Han, Dae Hee; Jung, Jung Im; Park, Seog Hee

    2011-01-01

    Portopulmonary venous anastomosis (PPVA), which has been rarely reported in conventional CT and MR studies, is an unusual collateral pathway in patients with portal hypertension. It has clinical implications related to right-to-left shunt that are different from the clinical implications related to other more usual portosystemic shunts in portal hypertensive patients. Here, we report the dynamic CT and MRA findings of a case of PPVA in a patient with portal hypertension, directly demonstrating the shunt flow from the paraesophageal varix to the left atrium via the right inferior pulmonary vein

  9. Dynamic CT and MRA findings of a case of portopulmonary venous anastomosis (PPVA) in a patient with portal hypertension: a case report and review of the literature

    Energy Technology Data Exchange (ETDEWEB)

    Ko, Jeong Min; Ahn, Myeong Im; Han, Dae Hee; Jung, Jung Im; Park, Seog Hee (Dept. of Radiology, Seoul St Mary' s Hospital, College of Medicine, The Catholic Univ. of Korea, Seoul (Korea, Republic of)), email: ami@catholic.ac.kr

    2011-06-15

    Portopulmonary venous anastomosis (PPVA), which has been rarely reported in conventional CT and MR studies, is an unusual collateral pathway in patients with portal hypertension. It has clinical implications related to right-to-left shunt that are different from the clinical implications related to other more usual portosystemic shunts in portal hypertensive patients. Here, we report the dynamic CT and MRA findings of a case of PPVA in a patient with portal hypertension, directly demonstrating the shunt flow from the paraesophageal varix to the left atrium via the right inferior pulmonary vein

  10. Magnetic resonance angiography (MRA)

    International Nuclear Information System (INIS)

    Arlart, I.P.; Guhl, L.

    1992-01-01

    An account is given in this paper of the physical and technical principles underlying the 'time-of-flight' technique for imaging of vessels by magnetic resonance tomography. Major indications for the new procedure of magnetic resonance angiography at present are intracerebral and extracerebral vessels, with digital subtraction angiography quite often being required to cope with minor alterations (small aneurysms, small occlusions). Magnetic resonance angiography and digital subtraction angiography are compared to each other for advantages and disadvantages. Basically, replacement of radiological angiography by magnetic resonance angiography appears to be possible only within limits, since X-ray diagnostics primarily provides morphological information about vessels, whereas flow dynamics is visualized by the 'time-of-flight' technique. (orig.) [de

  11. MR Angiography (MRA)

    Science.gov (United States)

    ... headsets so that the child can watch a movie while the scan is being performed. Thus, the ... the possible charges you will incur. Web page review process: This Web page is reviewed regularly by ...

  12. Gadolinium-enhanced MR angiography (Gd-MRA) of thoracic vasculature in an animal model using double-dose gadolinium and quiet breathing

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez, R.J.; Strouse, P.J. [Section of Pediatric Radiology, University of Michigan Health System, Ann Arbor (United States); Londy, F.J. [Dept. of Radiology, University of Michigan Hospitals, Ann Arbor, MI (United States); Wakefield, T.W. [Dept. of Surgery, Section of Vascular Surgery, University of Michigan Hospitals, Ann Arbor, MI (United States)

    2001-08-01

    Objective. To evaluate a gadolinium-enhanced MR angiography (Gd-MRA) imaging protocol for the assessment of thoracic vessels using double-dose gadolinium and quiet breathing. An animal model was used to simulate imaging in infants and young children. Material and methods. Six baboons (Papio anubis), mean weight 5.7 kg, were sedated and intubated. After the injection of double-dose Gd-DTPA (0.2 mmol/kg) through a peripheral vein, a coronal spoiled 3D gradient-echo volume acquisition was obtained during quiet breathing. Two radiologists reviewed the images for visualization of aortic arch, brachiocephalic vessel origins, pulmonary arteries (central, upper lobe and descending branches), and pulmonary veins (upper and lower). Results. Visualization was excellent for the aortic arch, brachiocephalic vessel origins, and pulmonary arteries, including the hilar branches. Visualization was excellent for the lower and right upper pulmonary veins and fair for the left upper pulmonary vein. There was excellent agreement between radiologists. Conclusion. Imaging of thoracic vessels with Gd-MRA using double gadolinium during quiet breathing was effective in our animal model. The advantages of this technique include a short imaging time and depiction of vascular segments - branches of pulmonary arteries and intraparenchymal segments of pulmonary veins - not optimally visualized with other non-invasive imaging techniques. (orig.)

  13. Gadolinium-enhanced MR angiography (Gd-MRA) of thoracic vasculature in an animal model using double-dose gadolinium and quiet breathing

    International Nuclear Information System (INIS)

    Hernandez, R.J.; Strouse, P.J.; Londy, F.J.; Wakefield, T.W.

    2001-01-01

    Objective. To evaluate a gadolinium-enhanced MR angiography (Gd-MRA) imaging protocol for the assessment of thoracic vessels using double-dose gadolinium and quiet breathing. An animal model was used to simulate imaging in infants and young children. Material and methods. Six baboons (Papio anubis), mean weight 5.7 kg, were sedated and intubated. After the injection of double-dose Gd-DTPA (0.2 mmol/kg) through a peripheral vein, a coronal spoiled 3D gradient-echo volume acquisition was obtained during quiet breathing. Two radiologists reviewed the images for visualization of aortic arch, brachiocephalic vessel origins, pulmonary arteries (central, upper lobe and descending branches), and pulmonary veins (upper and lower). Results. Visualization was excellent for the aortic arch, brachiocephalic vessel origins, and pulmonary arteries, including the hilar branches. Visualization was excellent for the lower and right upper pulmonary veins and fair for the left upper pulmonary vein. There was excellent agreement between radiologists. Conclusion. Imaging of thoracic vessels with Gd-MRA using double gadolinium during quiet breathing was effective in our animal model. The advantages of this technique include a short imaging time and depiction of vascular segments - branches of pulmonary arteries and intraparenchymal segments of pulmonary veins - not optimally visualized with other non-invasive imaging techniques. (orig.)

  14. Rigid 3D-3D registration of TOF MRA integrating vessel segmentation for quantification of recurrence volumes after coiling cerebral aneurysm

    International Nuclear Information System (INIS)

    Saering, Dennis; Forkert, Nils Daniel; Fiehler, Jens; Ries, Thorsten

    2012-01-01

    A fast and reproducible quantification of the recurrence volume of coiled aneurysms is required to enable a more timely evaluation of new coils. This paper presents two registration schemes for the semi-automatic quantification of aneurysm recurrence volumes based on baseline and follow-up 3D MRA TOF datasets. The quantification of shape changes requires a previous definition of corresponding structures in both datasets. For this, two different rigid registration methods have been developed and evaluated. Besides a state-of-the-art rigid registration method, a second approach integrating vessel segmentations is presented. After registration, the aneurysm recurrence volume can be calculated based on the difference image. The computed volumes were compared to manually extracted volumes. An evaluation based on 20 TOF MRA datasets (baseline and follow-up) of ten patients showed that both registration schemes are generally capable of providing sufficient registration results. Regarding the quantification of aneurysm recurrence volumes, the results suggest that the second segmentation-based registration method yields better results, while a reduction of the computation and interaction time is achieved at the same time. The proposed registration scheme incorporating vessel segmentation enables an improved quantification of recurrence volumes of coiled aneurysms with reduced computation and interaction time. (orig.)

  15. The diagnostic performance of non-contrast 3-Tesla magnetic resonance imaging (3-T MRI) versus 1.5-Tesla magnetic resonance arthrography (1.5-T MRA) in femoro-acetabular impingement

    Energy Technology Data Exchange (ETDEWEB)

    Crespo-Rodríguez, Ana M., E-mail: anacresporodriguez@gmail.com [Department of Radiology, Hospital Universitario Puerta de Hierro Majadahonda, c/ Joaquín Rodrigo 2, Majadahonda 28222, Madrid (Spain); De Lucas-Villarrubia, Jose C., E-mail: jclucasv@hotmail.com [Department of Orthopaedics and Traumatology at the Hospital Universitario Puerta de Hierro Majadahonda, c/ Joaquín Rodrigo 2, Majadahonda 28222, Madrid (Spain); Pastrana-Ledesma, Miguel, E-mail: m.pastrana@telefonica.net [Department of Radiology, Hospital Universitario Puerta de Hierro Majadahonda, c/ Joaquín Rodrigo 2, Majadahonda 28222, Madrid (Spain); Hualde-Juvera, Ana, E-mail: ana.hualdej@salud.madrid.org [Department of Radiology, Hospital Universitario Puerta de Hierro Majadahonda, c/ Joaquín Rodrigo 2, Majadahonda 28222, Madrid (Spain); Méndez-Alonso, Santiago, E-mail: smendez.sma@gmail.com [Department of Radiology, Hospital Universitario Puerta de Hierro Majadahonda, c/ Joaquín Rodrigo 2, Majadahonda 28222, Madrid (Spain); Padron, Mario, E-mail: mario.padron@clinicacemtro.com [Department of Radiology, Clínica Cemtro, Avda Ventisquero de la Condesa 42 Madrid 28035, Madrid (Spain)

    2017-03-15

    Highlights: • High resolution sequences at 3-T MRI extend accuracy in hip assessment without any need for intra-articular injection of contrast media. • As compared to 1.5-T MRA, 3-T non-contrast MRI of the hip improves the patient experience and avoids the potential risks of an invasive procedure and contrast media. • Avoiding the need for arthrographic procedures in the Radiology Department improves patient throughput and reduces costs. - Abstract: Objective: The aim of this study was to evaluate the diagnostic accuracy of 3-T non-contrast MRI versus 1.5-T MRA for assessing labrum and articular cartilage lesions in patients with clinical suspicion of femoro-acetabular impingement (FAI). Subjects and methods: Fifty patients (thirty men and twenty women, mean age 42.5 years) underwent 1.5-T MRA, 3-T MRI and arthroscopy on the same hip. An optimized high-resolution proton density spin echo pulse sequence was included in the 3-T non-contrast MRI protocol. Results: The 3-T non-contrast MRI identified forty-two of the forty-three arthroscopically proven tears at the labral-chondral transitional zone (sensitivity, 97.7%; specificity, 100%; positive predictive value (PPV), 100%; negative predictive value (NPV), 87.5%; accuracy 98%). With 1.5-T MRA, forty-four tears were diagnosed. However, there was one false positive (sensitivity, 100%; specificity, 85.7%; PPV, 97.7%; NPV, 100%; accuracy 98%). Agreement between arthroscopy and MRI, whether 3-T non-contrast MRI or 1.5-T MRA, as to the degree of chondral lesion in the acetabulum was reached in half of the patients and in the femur in 76% of patients. Conclusion: Non-invasive assessment of the hip is possible with 3-T MR magnet. 3-T non-contrast MRI could replace MRA as the workhorse technique for assessing hip internal damage. MRA would then be reserved for young adults with a strong clinical suspicion of FAI but normal findings on 3-T non-contrast MRI. When compared with 1.5-T MRA, optimized sequences with 3-T non

  16. The diagnostic performance of non-contrast 3-Tesla magnetic resonance imaging (3-T MRI) versus 1.5-Tesla magnetic resonance arthrography (1.5-T MRA) in femoro-acetabular impingement

    International Nuclear Information System (INIS)

    Crespo-Rodríguez, Ana M.; De Lucas-Villarrubia, Jose C.; Pastrana-Ledesma, Miguel; Hualde-Juvera, Ana; Méndez-Alonso, Santiago; Padron, Mario

    2017-01-01

    Highlights: • High resolution sequences at 3-T MRI extend accuracy in hip assessment without any need for intra-articular injection of contrast media. • As compared to 1.5-T MRA, 3-T non-contrast MRI of the hip improves the patient experience and avoids the potential risks of an invasive procedure and contrast media. • Avoiding the need for arthrographic procedures in the Radiology Department improves patient throughput and reduces costs. - Abstract: Objective: The aim of this study was to evaluate the diagnostic accuracy of 3-T non-contrast MRI versus 1.5-T MRA for assessing labrum and articular cartilage lesions in patients with clinical suspicion of femoro-acetabular impingement (FAI). Subjects and methods: Fifty patients (thirty men and twenty women, mean age 42.5 years) underwent 1.5-T MRA, 3-T MRI and arthroscopy on the same hip. An optimized high-resolution proton density spin echo pulse sequence was included in the 3-T non-contrast MRI protocol. Results: The 3-T non-contrast MRI identified forty-two of the forty-three arthroscopically proven tears at the labral-chondral transitional zone (sensitivity, 97.7%; specificity, 100%; positive predictive value (PPV), 100%; negative predictive value (NPV), 87.5%; accuracy 98%). With 1.5-T MRA, forty-four tears were diagnosed. However, there was one false positive (sensitivity, 100%; specificity, 85.7%; PPV, 97.7%; NPV, 100%; accuracy 98%). Agreement between arthroscopy and MRI, whether 3-T non-contrast MRI or 1.5-T MRA, as to the degree of chondral lesion in the acetabulum was reached in half of the patients and in the femur in 76% of patients. Conclusion: Non-invasive assessment of the hip is possible with 3-T MR magnet. 3-T non-contrast MRI could replace MRA as the workhorse technique for assessing hip internal damage. MRA would then be reserved for young adults with a strong clinical suspicion of FAI but normal findings on 3-T non-contrast MRI. When compared with 1.5-T MRA, optimized sequences with 3-T non

  17. Datskaja svadba Aleksandra Bashirova / Aleksandr Bashirov

    Index Scriptorium Estoniae

    Bashirov, Aleksandr

    2003-01-01

    Vene režissöör räägib oma eelseisvast ühistööst Lars von Trieriga, mille tulemuseks peaks saama Vene-Taani ühisfilm "Armastus pole müüdav", kus stsenarist ja režissöör on Bashirov, produtsent aga von Trier

  18. Derzhat nelzja devalvirovat / Aleksandr Tshaplõgin

    Index Scriptorium Estoniae

    Tšaplõgin, Aleksandr, 1964-

    2007-01-01

    Janek Mäggi väitest krooni devalveerumise kohta, Lätis vallandunud dollari- ja euroostupaanikast seoses juttudega lati võimalikust devalvatsioonist. Eesti Panga pressiteenistuse juht Janno Toots on seisukohal, et J. Mäggi ei valda teemat, ning soovitab sellele kõigele mitte tähelepanu pöörata. Heido Vitsur leiab, et nii lati kui ka krooni devalvatsiooni juttude taga on spekulandid

  19. Plod vlasti sozrel / Aleksandr Tshaplõgin

    Index Scriptorium Estoniae

    Tšaplõgin, Aleksandr, 1964-

    2008-01-01

    Politoloog Tõnis Saarts peab Reformierakonna reitingu järsku tõusu aprillis pigem ajutiseks nähtuseks; tema arvates kujutab Reformierakonnale suurimat ohtu IRL, samas kahtleb ta, kas Eestis leidub praegu poliitilist jõudu, kes tahaks saada võimule. ERL-i fraktsiooni esimehe Karel Rüütli arvates nõuab valitsuse vahetust olukord riigis. Jaanus Rahumägi, Eiki Nestori, Ain Seppiku arvamusi

  20. Vizit prezidenta Litvõ / Aleksandr Shegedin

    Index Scriptorium Estoniae

    Shegedin, Aleksandr

    2005-01-01

    Baltimaade NATO-sse astumise esimese aastapäeva tähistamise raames viibis Eestis president Arnold Rüütli kutsel Leedu president Valdas Adamkus, kes külastas visiidi käigus Palanga Merevaigumuuseumi näitust Eesti Rahvusraamatukogus ja kohtus Kadriorus president Arnold Rüütliga

  1. "Kuhu kadunud oled ..." : [luuletused] / Aleksandr Belonogov

    Index Scriptorium Estoniae

    Belonogov, Aleksandr

    2004-01-01

    Sisu: "Kuhu kadunud oled ..." ; "Puude juured haaravad ..." ; "Nagu hiljuti eraldi teelt ..." ; "Kui kord enam mõista ma ..." ; Käänded ; Väravale on kirjutatud ; Rahvas ütleb. Eluloolisi andmeid autori kohta lk. 361. Luuletused paralleelselt udmurdi ja eesti keeles

  2. Njakroshjusofilija, i ne tolko / Aleksandr Sokoljanski

    Index Scriptorium Estoniae

    Sokoljanski, Aleksandr

    2003-01-01

    Kõige eredamad teatrielamused 2003.a. Pikemalt Eimuntas Nekroshiuse lavastustest Kristionas Donelaitise (1714-1780) poeemi "Aastaajad" järgi. Samas ka A. Shapiro lavastusest Tallinna Linnateatris - "Isad ja pojad", kunstnik A. Freibergs

  3. Estoniju zhdut v Shengenskoi zone / Aleksandr Shegedin

    Index Scriptorium Estoniae

    Shegedin, Aleksandr

    2006-01-01

    Euroopa Komisjoni asepresident Franco Frattini külastas Eestit ja kohtus siseminister Kalle Laanetiga, kus põhitähelepanu koondus Schengeni infosüsteemi teise põlvkonna (SIS II) arendamisega seotud probleemidele. Siseministeeriumis peetud ettekandes rääkis Frattini ka ülemaailmsest kuritegevusest ja terrorismiohust. Tema kinnitusel ei saa Eesti ja Venemaa vahel puuduv piirileping takistuseks Eesti liitumisele Schengeni õigusruumiga ning Euroopa Liit üritab ühtlasi veenda Venemaad lepet sõlmima

  4. Nastojashtshih hristjan nelzja prinudit / Aleksandr Men

    Index Scriptorium Estoniae

    Men, Aleksandr

    2001-01-01

    Osa Aleksander Men'i poolt ettevalmistatud Piibli-teemalisest sõnastikust : m ja n täht : vabamüürlus ja Piibel, Dmitri Merezkovski, Methodios, mormoonide Piibli-tõlgendus, Nikolai Morozov, mittekristlikud tunnistused Kristusest

  5. Propaganda i kontrpropaganda / Aleksandr Tshaplõgin

    Index Scriptorium Estoniae

    Tšaplõgin, Aleksandr, 1964-

    2007-01-01

    Europarlamendis esines Öise Vahtkonna liige Juri Zhuravljov informatsiooniga väidetavast politsei vägivallast pronksööl. Riigikogu eurokomisjoni esimees Marko Mihkelson on väitnud, et ürituse organisaatoriks on Läti eurosaadik Tatjana Zhdanok. Europarlamendi liikme Katrin Saksa väiteid

  6. Naiti kozla otpushtshenija / Aleksandr Tshaplõgin

    Index Scriptorium Estoniae

    Tšaplõgin, Aleksandr, 1964-

    2007-01-01

    Analüütikute arvates ootab Eestit majanduslangus, kuid poliitikud ei taha seda kinnitada. Parlamendiliikme Heimar Lengi arvates tabab valitsust sügisel tõsine sisekriis, Eiki Nestori arvates valitsuskoalitsioonis probleeme pole

  7. Skazka o serom volke / Aleksandr Shegedin

    Index Scriptorium Estoniae

    Shegedin, Aleksandr

    2006-01-01

    Riigikogu infotunnis vastasid Riigikogu liikmete küsimustele kodakondsuse andmise kohta Andrei Filatovile ning minister Edgar Savisaare Moskva visiidi ja Keskerakonna koostööleppe kohta Ühtse Venemaaga peaminister Andrus Ansip ja välisminister Urmas Paet

  8. Mobilnik - drug tshekista / Aleksandr Tshaplõgin

    Index Scriptorium Estoniae

    Tšaplõgin, Aleksandr, 1964-

    2008-01-01

    Autor kirjutab jõustruktuuride viimasel ajal hoogustunud kõrgendatud huvist ühiskonnategelaste ja ajakirjanike vastu. Artiklis on vahendatud ka Riigikogu Rahvaliidu fraktsiooni esimehe Karel Rüütli arvamust

  9. Reabilitatsija poka ne udalass / Aleksandr Shegedin

    Index Scriptorium Estoniae

    Shegedin, Aleksandr

    2006-01-01

    Riigikogu lükkas tagasi Isamaaliidu ja SDE fraktsioonide poolt esitatud eelnõu, mis oleks andnud isikutele, kes olid võitluses Eesti Vabariigi iseseisvuse eest nõukogude kohtute poolt süüdimõistetud, täiendava võimaluse rehabiliteerimistaotluste esitamiseks

  10. Improved target volume definition in radiosurgery of arteriovenous malformations by stereotactic correlation of MRA, MRI, blood bolus tagging, and functional MRI

    International Nuclear Information System (INIS)

    Schad, L.R.; Bock, M.; Baudendistel, K.; Essig, M.; Debus, J.; Knopp, M.V.; Engenhart, R.; Lorenz, W.J.

    1996-01-01

    The authors report the sterotactic correlation of different MRI-techniques [MR angiography (MRA), MRI, blood bolus tagging (STAR), and functional MRI] in 10 patients with cerebral arteriovenous malformations (AVM) and its application in precision radiotherapy planning. The patient's head was fixed in a stereotactic localization system. By phantom measurements different materials (steel, aluminium, titanium, plastic, wood, ceramics) used for the stereotactic system were tested for mechanical stability and geometrical MR image distortion. All metallic stereotactic rings led to a more or less dramatic geometrical distortion and signal cancellation in the MR images. The best properties - nearly no distortion and high mechanical stability - are provided by a ceramic ring. If necessary, the remaining geometrical MR image distortion can be 'corrected' by calculations based on modeling the distortion as a fourth-order 2D-polynomial. Using this method multimodality matching can be performed automatically as long as all images are acquired in the same examination and the patient is sufficiently immobilized. Precise definition of the target volume could be performed by the radiotherapist either directly in MR images or in calculated projection MR angiograms. As a result, information about the hemodynamics of the AVM was provided by a 3D-phase-contrast flow measurement and a dynamic MRA with the STAR technique leading to an improved definition of the size of the nidus, and the pattern of the venous drainage. In addition, functional MRI was performed in patients with lesions close to the primary motor cortex area leading to an improved definition of structures at risk for high-dose application in radiosurgery. (orig./MG)

  11. Analysis of MreB interactors in Chlamydia reveals a RodZ homolog but fails to detect an interaction with MraY.

    Science.gov (United States)

    Ouellette, Scot P; Rueden, Kelsey J; Gauliard, Emilie; Persons, Logan; de Boer, Piet A; Ladant, Daniel

    2014-01-01

    Chlamydia is an obligate intracellular bacterial pathogen that has significantly reduced its genome in adapting to the intracellular environment. One class of genes for which the bacterium has few annotated examples is cell division, and Chlamydia lacks FtsZ, a central coordinator of the division apparatus. We have previously implicated MreB as a potential substitute for FtsZ in Chlamydia (Ouellette et al., 2012). Thus, to identify new chlamydial cell division components, we searched for proteins that interacted with MreB. We performed a small-scale screen using a Gateway® compatible version of the Bacterial Adenylate Cyclase Two Hybrid (BACTH) system, BACTHGW, to detect proteins interacting with chlamydial MreB and identified a RodZ (YfgA) homolog. The chlamydial RodZ aligns well with the cytoplasmic domain of E. coli RodZ but lacks the periplasmic domain that is dispensable for rod cell shape maintenance in E. coli. The expression pattern of yfgA/rodZ was similar to that of mreB and ftsI, suggesting that these genes may operate in a common functional pathway. The chlamydial RodZ correctly localized to the membrane of E. coli but was unable to complement an E. coli rodZ mutant strain, likely because of the inability of chlamydial RodZ to interact with the native E. coli MreB. Finally, we also tested whether chlamydial MreB could interact with MraY, as suggested by Gaballah et al. (2011). However, we did not detect an interaction between these proteins even when using an implementation of the BACTH system to allow native orientation of the N- and C-termini of MraY in the periplasm. Thus, further work will be needed to establish this proposed interaction. In sum, we have added to the repertoire of potential cell division proteins of Chlamydia.

  12. Analysis of MreB interactors in Chlamydia reveals a RodZ homolog but fails to detect an interaction with MraY

    Directory of Open Access Journals (Sweden)

    Scot P Ouellette

    2014-06-01

    Full Text Available Chlamydia is an obligate intracellular bacterial pathogen that has significantly reduced its genome in adapting to the intracellular environment. One class of genes for which the bacterium has few annotated examples is cell division, and Chlamydia lacks FtsZ, a central coordinator of the division apparatus. We have previously implicated MreB as a potential substitute for FtsZ in Chlamydia (Ouellette et al., 2012. Thus, to identify new chlamydial cell division components, we searched for proteins that interacted with MreB. We performed a small-scale screen using a Gateway® compatible version of the Bacterial Adenylate Cyclase Two Hybrid (BACTH system, BACTHGW, to detect proteins interacting with chlamydial MreB and identified a RodZ (YfgA homolog. The chlamydial RodZ aligns well with the cytoplasmic domain of E. coli RodZ but lacks the periplasmic domain that is dispensable for rod cell shape maintenance in E. coli. The expression pattern of yfgA/rodZ was similar to that of mreB and ftsI, suggesting that these genes may operate in a common functional pathway. The chlamydial RodZ correctly localized to the membrane of E. coli but was unable to complement an E. coli rodZ mutant strain, likely because of the inability of chlamydial RodZ to interact with the native E. coli MreB. Finally, we also tested whether chlamydial MreB could interact with MraY, as suggested by Gaballah et al. (2011. However, we did not detect an interaction between these proteins even when using an implementation of the BACTH system to allow native orientation of the N- and C-termini of MraY in the periplasm. Thus, further work will be needed to establish this proposed interaction. In sum, we have added to the repertoire of potential cell division proteins of Chlamydia.

  13. Biochemical and functional characterization of MRA-1571 of Mycobacterium tuberculosis H37Ra and effect of its down-regulation on survival in macrophages

    International Nuclear Information System (INIS)

    Sharma, Rishabh; Keshari, Deepa; Singh, Kumar Sachin; Singh, Sudheer Kumar

    2017-01-01

    Amino acid biosynthesis has emerged as a source of new drug targets as many bacterial strains auxotrophic for amino acids fail to proliferate under in vivo conditions. Branch chain amino acids (BCAAs) are important for Mycobacterium tuberculosis (Mtb) survival and strains deficient in their biosynthesis were attenuated for growth in mice. Threonine dehydratase (IlvA) is a pyridoxal-5-phosphate (PLP) dependent enzyme that catalyzes the first step in isoleucine biosynthesis. The MRA-1571 of Mycobacterium tuberculosis H37Ra (Mtb-Ra), annotated to be coding for IlvA, was cloned, expressed and purified. Purified protein was subsequently used for developing enzyme assay and to study its biochemical properties. Also, E. coli BL21 (DE3) IlvA knockout (E. coli-ΔilvA) was developed and genetically complemented with Mtb-Ra ilvA expression construct (pET32a-ilvA) to make complemented E. coli strain (E. coli-ΔilvA + pET32a-ilvA). The E. coli-ΔilvA showed growth failure in minimal medium but growth restoration was observed in E. coli-ΔilvA + pET32a-ilvA. E. coli-ΔilvA growth was also restored in the presence of isoleucine. The IlvA localization studies detected its distribution in cell wall and membrane fractions with relatively minor presence in cytosolic fraction. Maximum IlvA expression was observed at 72 h in wild-type (WT) Mtb-Ra infecting macrophages. Also, Mtb-Ra IlvA knockdown (KD) showed reduced survival in macrophages compared to WT and complemented strain (KDC). - Highlights: • Mtb-Ra gene MRA-1571 codes for a functional threonine dehydratase (IlvA). • IlvA is pyridoxal 5’-phosphate dependent and is inhibited by isoleucine. • E. coli IlvA knockout growth can be supplemented by isoleucine or by Mtb-Ra IlvA. • The enzyme is primarily localized in cell wall and membrane fractions. • IlvA knockdown Mtb-Ra shows reduced growth in macrophages.

  14. Aleksandr Nevski. Iz Gollivuda s bolshoi ljubovju / Aleksandr Nevski ; interv. Anton Vedenkin

    Index Scriptorium Estoniae

    Nevski, Aleksandr

    2007-01-01

    Kalifornias elav ja Hollywoodis töötav vene kulturist, näitleja ja produtsent esitleb oma osalemisel ja produtseerimisel valminud Venemaa - USA koostööfilmi "Treasure Riders"/"Ohhotniki za sokrovishtshami"

  15. A Study on Effects of the Transient Compression by Tightly Tied Necktie on Blood Flow in the Internal Jugular Veins Using 2D-PC MRA

    International Nuclear Information System (INIS)

    Kim, Keung Sik; Chung, Tae Sub; Lee, Bum Soo; Park, In Kook; Kim, Hyun Soo; Yoo, Beong Gyu

    2008-01-01

    The 25 healthy male volunteers aged from 20 to 50 years old have been employed in this study. 2D-PC MRA was performed to measure the velocity of the blood flow in the internal carotid artery and internal jugular veins using 3.0T MRI Whole body (signa VH/i GE). ECTRICKS-CEMRA was performed to evaluate the pattern of blood circulation from internal carotid artery to internal jugular vein. Using 2D-PC MRA, the cross-section of the 4th and 5th cervical discs was scanned with 24 cm FOV. Then the speed of blood flow was measured for internal carotid artery and internal jugular vein when the subject wears a necktie tightly and no tie. The average of maximum velocity of internal carotid arteries without a necktie was 72.13 cm/sec in the right side and 74.96 cm/sec in the left side (average 73.54 cm/sec in both sides) while the average of maximum velocity of internal jugular veins without a necktie was -34.45 cm/sec in the right side and -24.99 cm/sec in the left side (-29.72 cm/sec in both sides). However, when wearing a necktie tightly, the average of maximum velocity of internal carotid arteries was 61.35 cm/sec in the right side and 65.19 cm/sec in the left side (average 63.27 cm/sec in both sides) while the average of maximum velocity of internal jugular veins was -22.14 cm/sec in the right side and -17.93 cm/sec in the left side (-20.03 cm/sec in both sides). With the necktie tightly knotted, the average blood flow speed of both internal carotid arteries slightly decreased to 86% (63.27/73.54 cm/sec) compared to no tie case in which both internal jugularveins significantly went down to 67% (-20.03/-29.72 cm/sec). Thus it is suggested that wearing a necktie affects the circulation of internal jugular veins (33% decrease in blood flow speed) more significantly than that of internal carotid artery (14% decrease in blood flow speed). Without a necktie, ECTRICKS-CEMRA showed natural blood circulation patterns of internal carotid arteries and internal jugular veins without

  16. Quantitative evaluation of high intensity signal on MIP images of carotid atherosclerotic plaques from routine TOF-MRA reveals elevated volumes of intraplaque hemorrhage and lipid rich necrotic core.

    Science.gov (United States)

    Yamada, Kiyofumi; Song, Yan; Hippe, Daniel S; Sun, Jie; Dong, Li; Xu, Dongxiang; Ferguson, Marina S; Chu, Baocheng; Hatsukami, Thomas S; Chen, Min; Zhou, Cheng; Yuan, Chun

    2012-11-29

    Carotid intraplaque hemorrhage (IPH) and lipid rich necrotic core (LRNC) have been associated with accelerated plaque growth, luminal narrowing, future surface disruption and development of symptomatic events. The aim of this study was to evaluate the quantitative relationships between high intensity signals (HIS) in the plaque on TOF-MRA and IPH or LRNC volumes as measured by multicontrast weighted CMR. Seventy six patients with a suspected carotid artery stenosis or carotid plaque by ultrasonography underwent multicontrast carotid CMR. HIS presence and volume were measured from TOF-MRA MIP images while IPH and LRNC volumes were separately measured from multicontrast CMR. For detecting IPH, HIS on MIP images overall had high specificity (100.0%, 95% CI: 93.0 - 100.0%) but relatively low sensitivity (32%, 95% CI: 20.8 - 47.9%). However, the sensitivity had a significant increasing relationship with underlying IPH volume (p = 0.033) and degree of stenosis (p = 0.022). Mean IPH volume was 2.7 times larger in those with presence of HIS than in those without (142.8 ± 97.7 mm(3) vs. 53.4 ± 56.3 mm(3), p = 0.014). Similarly, mean LRNC volume was 3.4 times larger in those with HIS present (379.8 ± 203.4 mm(3) vs. 111.3 ± 122.7 mm(3), p = 0.001). There was a strong correlation between the volume of the HIS region and the IPH volume measured from multicontrast CMR (r = 0.96, p routine, clinical TOF sequences. High intensity signals in carotid plaque on TOF-MRA MIP images are associated with increased intraplaque hemorrhage and lipid-rich necrotic core volumes. The technique is most sensitive in patients with moderate to severe stenosis.

  17. Three-dimensional contrast-enhanced magnetic resonance angiography (3-D CE-MRA) in the evaluation of hemodialysis access complications, and the condition of central veins in patients who are candidates for hemodialysis access.

    Science.gov (United States)

    Paksoy, Yahya; Gormus, Niyazi; Tercan, Mehmet Akif

    2004-01-01

    Arteriovenous (AV) fistulas are crucial in patients requiring long-term hemodialysis (HD). Dysfunctions of these fistulas are the most common causes of recurrent hospitalizations. This study aimed to evaluate the feasibility, safety and usefulness of contrast-enhanced magnetic resonance angiography (CE-MRA) in the evaluation of HD fistulas complications, and the condition of the central veins before HD access. This study comprised 30 consecutive patients (15 females, 15 males; age range 25-66 yrs, mean +/- SD 51.2 +/- 9.9 yrs). Of 30 patients, 26 had native AV fistulas and the remaining four patients, who had a history of previous subclavian vein catheterization, were candidates for HD fistulas. Nine patients had a radiocephalic fistula, 15 had a brachiobasilic fistula, one had a saphenous vein graft, and one had brachiobasilic vein transposition. To observe the fistula complications in these cases, three-dimensional (3-D) CE-MRA using gadolinium was performed. The results were considered normal in three patients (10%), who were candidates for AV fistula construction; one patient had central vein occlusion due to previous catheterization. Thirteen patients (43.3%) had venous stenosis or occlusion; three of them (10%) had low CE arteries distal to fistula region, leading to ischemic complications, and six (20%) had stenosis at the fistula region. Seven patients (23.3%) had venous pseudoaneurysms, whereas two of them had both pseudoaneurysms and fistula region stenosis, and one had both venous stenosis and pseudoaneurysm. There were no adverse or allergic-like reactions or heat and taste sensations observed in our series. 3-D CE-MRA is a useful, safe and a practical imaging modality in complicated fistula diagnosis with fewer complications and side-effects in comparison to fistulography.

  18. Contrast-enhanced magnetic resonance angiography (MRA): evaluation of three different contrast agents at two different doses (0.05 and 0.1 mmol/kg) in pigs at 1.5 Tesla

    Energy Technology Data Exchange (ETDEWEB)

    Voth, M.; Vos, B.; Pietsch, H. [Bayer Schering Pharma AG, Diagnostic Imaging, Berlin (Germany); Michaely, Henrik J. [University of Heidelberg, Institute of Clinical Radiology and Nuclear Medicine, University Medical Center Mannheim, Medical Faculty Mannheim, Mannheim (Germany); Schwenke, C. [ScoSSiS - Statistical Consulting, Berlin (Germany)

    2011-02-15

    To compare the image quality of contrast-enhanced magnetic resonance angiography (CE-MRA) of the supra-aortic vessels at 0.05 mmol/kg bw and 0.1 mmol/kg bw, between gadobutrol, Gd-DTPA and Gd-BOPTA quantitatively and qualitatively a total of eight pigs were evaluated intraindividually at 1.5 T. Each pig was examined using 0.1 mmol/kg gadobutrol, Gd-DTPA and Gd-BOPTA on day one and 0.05 mmol/kg on day two. MRA datasets for the carotid artery and the infraorbital artery were qualitatively assessed regarding overall image quality on an ordinal four-point scale (4-excellent, 1-non-diagnostic). The signal-to noise-ratio (SNR) was measured. The qualitative assessment of the carotid artery showed a higher median image quality for the 0.1 mmol dose than for the 0.05 mmol dose for all three compounds. No difference was found for the infraorbital artery. Mean SNR of Gd-BOPTA, Gd-DTPA, gadobutrol at 0.05 mmol/kg were 36.0 {+-} 13.4/37.9 {+-} 16.3/43.7 {+-} 0.4 and at 0.1 mmol/kg they were 50.1 {+-} 12.4/46.6 {+-} 6.5 / 54.6 {+-} 10.2. Gd-BOPTA 0.05 revealed a significantly lower SNR than all other agents at normal dose. Full-dose gadolinium MRA results in higher image quality and significantly higher SNR compared with the half dose. Gadobutrol and Gd-BOPTA have similar enhancement properties at full dose but at half dose, gadobutrol appears superior. (orig.)

  19. Characterization of arterial stenosis using 3D imaging: comparison between three imaging techniques (MRA, spiral CTA and 3D DSA) and four display methods (MIP, SR, MPVR, VA) in a phantom study

    International Nuclear Information System (INIS)

    Bendib, K.; Poirier, C.; Croisille, P.; Roux, J.P.; Devel, D.; Amiel, M.

    1999-01-01

    Introduction: accurate assessment of arterial stenosis is a major public health issue for the diagnosis and treatment of cardiovascular diseases. The number of imaging techniques and types of software for display of imaging data is increasing. Few studies that compare these different techniques are available in the literature. Materials and methods: using phantoms to reproduce the main types of arterial stenosis, the authors compared three 3D acquisition techniques (MRA, CTA, and 3D DSA) and four types of display methods (MIP, SR, MPVR, and VA). The degree, the shape, and the location of different types of stenoses were analyzed by three experienced observers during two successive readings. Intra- and inter-observer reproducibility were assessed. The results of the various acquisition techniques and display methods also were compared to the digital reference data (CFAO) of the physical phantoms. Results: the degree of intra- and inter-observer reproducibility for the assessment of shape and location of the stenoses was good. Visual assessment of the degree of stenosis showed significant differences between two observers as well as in two readings by one observer. The 3D DSA was the most accurate technique for assessing the degree of stenosis. CTA provided better results than MRA. MPVR provided an accurate assessment of the degree of the stenosis. 3D DSA and CTA assessed stenosis form and localization adequately, with no significant difference; both methods appeared to be more accurate than MRA. SR provided the best information on the eccentric nature of the stenosis. The shape was very well assessed by VA and MPVR. Conclusions: even though 3D DSA is the most accurate acquisition technique for visualization, the combined use of SR and MPVR appears to be the best compromise to describe the morphology and degree of stenosis. Further improvements in automatic 3D image processing could offer a better understanding and increased possibilities for assessing arterial

  20. 3.0 Tesla high spatial resolution contrast-enhanced magnetic resonance angiography (CE-MRA) of the pulmonary circulation: initial experience with a 32-channel phased array coil using a high relaxivity contrast agent.

    Science.gov (United States)

    Nael, Kambiz; Fenchel, Michael; Krishnam, Mayil; Finn, J Paul; Laub, Gerhard; Ruehm, Stefan G

    2007-06-01

    To evaluate the technical feasibility of high spatial resolution contrast-enhanced magnetic resonance angiography (CE-MRA) with highly accelerated parallel acquisition at 3.0 T using a 32-channel phased array coil, and a high relaxivity contrast agent. Ten adult healthy volunteers (5 men, 5 women, aged 21-66 years) underwent high spatial resolution CE-MRA of the pulmonary circulation. Imaging was performed at 3 T using a 32-channel phase array coil. After intravenous injection of 1 mL of gadobenate dimeglumine (Gd-BOPTA) at 1.5 mL/s, a timing bolus was used to measure the transit time from the arm vein to the main pulmonary artery. Subsequently following intravenous injection of 0.1 mmol/kg of Gd-BOPTA at the same rate, isotropic high spatial resolution data sets (1 x 1 x 1 mm3) CE-MRA of the entire pulmonary circulation were acquired using a fast gradient-recalled echo sequence (TR/TE 3/1.2 milliseconds, FA 18 degrees) and highly accelerated parallel acquisition (GRAPPA x 6) during a 20-second breath hold. The presence of artifact, noise, and image quality of the pulmonary arterial segments were evaluated independently by 2 radiologists. Phantom measurements were performed to assess the signal-to-noise ratio (SNR). Statistical analysis of data was performed by using Wilcoxon rank sum test and 2-sample Student t test. The interobserver variability was tested by kappa coefficient. All studies were of diagnostic quality as determined by both observers. The pulmonary arteries were routinely identified up to fifth-order branches, with definition in the diagnostic range and excellent interobserver agreement (kappa = 0.84, 95% confidence interval 0.77-0.90). Phantom measurements showed significantly lower SNR (P < 0.01) using GRAPPA (17.3 +/- 18.8) compared with measurements without parallel acquisition (58 +/- 49.4). The described 3 T CE-MRA protocol in addition to high T1 relaxivity of Gd-BOPTA provides sufficient SNR to support highly accelerated parallel acquisition

  1. Evaluation of time-of-flight and phase-contrast MRA sequences at 1.0 T for diagnosis of carotid artery disease. Pt. 1. A phantom and volunteer study

    International Nuclear Information System (INIS)

    Cronqvist, M.; Staahlberg, F.; Larsson, E.M.; Loenntoft, M.; Holtaas, S.

    1995-01-01

    The aim of this work was, firstly, to compare different manufacturer-provided MRA sequences in a 1.0 T MR unit, with respect to the visibility of an artificial stenosis in a flow phantom and, secondly, to evaluate the same sequences in healthy volunteers with respect to S/N ratio levels and practical in vivo implementation routines. The studied sequences were 2D and 3D TOF and sequences with an acquisition time of approximately 10 min. Quantitative signal evaluation was made using single transverse partitions in all phantom experiments. MIP angiograms and MPR reconstructions were made for visual inspection of image quality. In vivo, the images were individually evaluated by visual inspection by experienced neuroradiologists. In the evaluation of the grade and length of a stenosis, a combination of MIP and MPR was seen to be the optimal and necessary procedure. A shortening of TE played an important and significant role in the visualization of the poststenotic flow in the phantom using TOF MRA. However, the shortest TE values gave poor S/N ratio in vivo. The good results achieved in the phantom studies for 3D phase-contrast were somewhat reversed in the volunteer studies, whereas 3D TOF sequences showed good results in both the phantom and the volunteer studies. (orig.)

  2. Quantitative evaluation of high intensity signal on MIP images of carotid atherosclerotic plaques from routine TOF-MRA reveals elevated volumes of intraplaque hemorrhage and lipid rich necrotic core

    Directory of Open Access Journals (Sweden)

    Yamada Kiyofumi

    2012-11-01

    Full Text Available Abstract Background Carotid intraplaque hemorrhage (IPH and lipid rich necrotic core (LRNC have been associated with accelerated plaque growth, luminal narrowing, future surface disruption and development of symptomatic events. The aim of this study was to evaluate the quantitative relationships between high intensity signals (HIS in the plaque on TOF-MRA and IPH or LRNC volumes as measured by multicontrast weighted CMR. Methods Seventy six patients with a suspected carotid artery stenosis or carotid plaque by ultrasonography underwent multicontrast carotid CMR. HIS presence and volume were measured from TOF-MRA MIP images while IPH and LRNC volumes were separately measured from multicontrast CMR. Results For detecting IPH, HIS on MIP images overall had high specificity (100.0%, 95% CI: 93.0 – 100.0% but relatively low sensitivity (32%, 95% CI: 20.8 – 47.9%. However, the sensitivity had a significant increasing relationship with underlying IPH volume (p = 0.033 and degree of stenosis (p = 0.022. Mean IPH volume was 2.7 times larger in those with presence of HIS than in those without (142.8 ± 97.7 mm3 vs. 53.4 ± 56.3 mm3, p = 0.014. Similarly, mean LRNC volume was 3.4 times larger in those with HIS present (379.8 ± 203.4 mm3 vs. 111.3 ± 122.7 mm3, p = 0.001. There was a strong correlation between the volume of the HIS region and the IPH volume measured from multicontrast CMR (r = 0.96, p  Conclusion MIP images are easily reformatted from three minute, routine, clinical TOF sequences. High intensity signals in carotid plaque on TOF-MRA MIP images are associated with increased intraplaque hemorrhage and lipid-rich necrotic core volumes. The technique is most sensitive in patients with moderate to severe stenosis.

  3. U Jevropõ - dve skorosti / Aleksandr Shegedin

    Index Scriptorium Estoniae

    Shegedin, Aleksandr

    2007-01-01

    Endise Euroopa Komisjoni esimehe ja praeguse Itaalia peaministri Romano Prodi intervjuust internetiportaalile EuroActiv. Prodi viitas Euroopa Liidu kahestumisele, rääkis Euroopa põhiseadusleppest ja ühtsest energeetikapoliitikast

  4. Ping-pong tsherez granitsu, kotoroi net / Aleksandr Shegedin

    Index Scriptorium Estoniae

    Shegedin, Aleksandr

    2006-01-01

    Võrus toimus Saksamaa poolel sõdinud veteranide traditsiooniline kokkutulek, kus esines ka peaminister Andrus Ansip. Venemaa reageeris tavapäraste süüdistustega: katse rehabiliteerida natsismi, Teise maailmasõja tulemuste ümberhindamine, venelaste olukord Baltimaades. Venemaa - Soome suhted

  5. Poslõ napali na druzei Ilvesa / Aleksandr Shegedin

    Index Scriptorium Estoniae

    Shegedin, Aleksandr

    2006-01-01

    Hans Rebase Euroopa Instituudi ja Euroopa Parlamendi väliskomisjoni aseesimehe Toomas Hendrik Ilvese kutsel esinesid Tallinnas peetud konverentsil energiapoliitika tippteadlased USA-st, Suurbritanniast, Venemaalt, Rootsist ja mujalt. Ülevaade sõnavõttudest

  6. V Jevrope natshalass ohhota za migrantami / Aleksandr Shegedin

    Index Scriptorium Estoniae

    Shegedin, Aleksandr

    2004-01-01

    Detsembris toimuval Euroopa Liidu tippkohtumisel Hollandis keskendutakse migratsiooniprobleemide lahendusteede otsimisele Euroopas. Võõrtööjõu ja pagulaste probleeme Eestis kommenteerib siseminister Margus Leivo

  7. Imperatritsa ili sovetskaja zhenshtshina? / Aleksandr Vassiljev ; interv. N. Rumjantseva

    Index Scriptorium Estoniae

    Vassiljev, Aleksandr

    2002-01-01

    Kunstnik ja moeajaloolane oma intervjuust kuulsa baleriini Maia Plissetskajaga (1925), mille ta tegi detsembris Monte-Carlos esilinastuva baleriini portreefilmi jaoks. Telekanali "Arte" filmi stsenarist on Kristian Lvovski ja stsenarist krahvinna Jelizaveta Kapnist

  8. Koren kvadratnõi iz prazdnikov / Aleksandr Ikonnikov

    Index Scriptorium Estoniae

    Ikonnikov, Aleksandr

    2004-01-01

    Venemaa välisministeeriumi avaldusest seoses AVAKS süsteemi radar-lennuki ülelennuga Venemaa piiri läheduses, süüdistused Eesti ja Läti aadressil jõudsid nõudmisteni venekeelse elanikkonna õiguste kaitseks

  9. God 1998-i : Groznõi prognoz astrologa / Aleksandr Shegedin

    Index Scriptorium Estoniae

    Shegedin, Aleksandr

    2006-01-01

    1998. aasta Eestis: Reformierakonna esimehele Siim Kallasele esitati süüdistus seoses 10 miljoni dollari kadumisega Põhja-Eesti Pangast, parteid valmistusid parlamendivalimisteks ning puhkes tüli Vene ja Eesti õigeusu kiriku vahel

  10. Aga sellepärast, et on po... / Aleksandr Astrov

    Index Scriptorium Estoniae

    Astrov, Aleksandr

    2005-01-01

    Arutledes venekeelse valija hääletuskäitumise ümber juhib autor tähelepanu, et Eestis sätestab üks konkreetne seadus venelastele valimisõiguse, andes neile reaalse poliitilise jõu, teine aga piirab nende juurdepääsu ainult keele kaudu ligipääsetavatele eetikaressurssidele, mis võimaldaksid teha teadlikku valikut

  11. Aleksei Barabash : "Moi Aleksandr - pero, pushtshonnoje po vetru" / Eteri Kekelidze

    Index Scriptorium Estoniae

    Kekelidze, Eteri, 1944-

    2003-01-01

    Vitali Melnikovi ajalooline mängufilm Paul I-sest Dmitri Merezhkovski näidendi järgi "Vaene, vaene Paul" ("Bednõi, bednõi Pavel"). PÖFFil viibinud troonipärija Aleksandri rolli täitnud näitleja Aleksei Barabash räägib oma tööst selles filmis

  12. Istorija mojei semi / Aleksandr Stahhovitsh ; per. s frantsuzskogo: Aleksei Gluhhov

    Index Scriptorium Estoniae

    Stahhovitsh, Aleksandr

    1998-01-01

    Vene emigrandi poja, prantsuse diplomaadi mälestused oma suguvõsast, kirjutatud Luxembourgis 1967. a. augustis. Vt. ka Aleksei Gluhhovi artiklit 'S tem zhe dostoinstvom i veroi' (Võshgorod 1998, nr. 4, lk. 6-8)

  13. U Portugalii dusha poeta / Ana Paula Zacarias ; interv. Aleksandr Shegedin

    Index Scriptorium Estoniae

    Zacarias, Ana Paula

    2006-01-01

    Äsja avatud Portugali saatkonda juhtiv suursaadik Ana Paula Baptista Grade Zacarias jagab Portugali kogemusi seoses liitumisega Euroopa Liiduga. Eesti-Portugali suhted, suursaadiku esmamuljed Eestist

  14. Istorija vnov aktualna / Aleksandr Tšaplõgin

    Index Scriptorium Estoniae

    Tšaplõgin, Aleksandr, 1964-

    2007-01-01

    Euroopa Nõukogu Parlamentaarse Assamblee president Rene van der Linden kritiseeris Eestit seoses Teises maailmasõjas Saksa poolel sõdinute kokkutulekuga Sinimägedes. Parlamendiliikmete Marko Mihkelsoni, Peeter Kreitzbergi, Evelin Sepa ja Vladimir Velmani arvamusi

  15. Nash put v budushtsheje / Mihhail Stalnuhhin ; interv. Aleksandr Mjassojedov

    Index Scriptorium Estoniae

    Stalnuhhin, Mihhail, 1961-

    2005-01-01

    Narva volikogu esimees Mihhail Stalnuhhin osales Šveitsis toimunud rahvusvahelisel konverentsil "Multikultuurilisus ja 21. sajandi etnopoliitilised mudelid", konverentsil räägitust ning teemadest, mis puudutasid Eestit

  16. Mõ za zonu stabilnosti na Baltike / Aleksandr Avdejev

    Index Scriptorium Estoniae

    Avdejev, Aleksandr

    2000-01-01

    Venemaa asevälisminister: Venemaa on huvitatud koostööst Baltimaadega ja stabiilsusest selles regioonis. Arvamused teemadel: Vene-Eesti suhted, integratsioonipoliitika, Läti sõjaveteranide marss, kaasmaalaste kaitse Venemaa valitsuse poolt

  17. Ot Tallsinki do Hellinna 80 km / Aleksandr Kulakov

    Index Scriptorium Estoniae

    Kulakov, Aleksandr

    2005-01-01

    23. kuni 25. septembrini toimus Helsingis Soome noorteühenduse TOK poolt korraldatud meediaseminar, kus osalesid vene keelt kõnelevad noored Eestist ja Soomest, ajakirjanikud ja noortega töötavad spetsialistid. Seminari eesmärgiks oli luua kontakte noorte ja vanemate loomeinimeste vahel ning leida võimalusi informatsiooni vahetamiseks ja koostöö arendamiseks erinevates riikides elavate venekeelsete noorte vahel

  18. Pobedit ukrainskii narod / Pavlo Kiriakov ; interv. Aleksandr Shegedin

    Index Scriptorium Estoniae

    Kiriakov, Pavlo

    2007-01-01

    Ukraina suursaadik Eestis vastab küsimustele, mis puudutavad Ukraina iseseisvumist, SRÜ-d, arutelu riigis EL-i ja NATO-ga liitumise üle, Venemaa Musta mere laevastiku lahkumist 2017. aastaks, vene keele olukorda Ukrainas, oranzhi revolutsiooni, koostööd Eestiga. Suursaadik rõhutab, et Ukraina on ja jääb unitaarseks sõltumatuks riigiks

  19. Assessment and treatment planning of lateral intracranial dural arteriovenous fistulas in 3 T MRI and DSA: A detailed analysis under consideration of time-resolved imaging of contrast kinetics (TRICKS) and ce-MRA sequences

    Energy Technology Data Exchange (ETDEWEB)

    Ertl, L.; Brueckmann, H.; Patzig, M.; Brem, C.; Forbrig, R.; Fesl, G. [Ludwig-Maximilians-University, Grosshadern Campus, Department of Neuroradiology, Institute of Clinical Radiology, Munich (Germany); Kunz, M. [Ludwig-Maximilians-University, Grosshadern Campus, Department of Neurosurgery, Munich (Germany)

    2016-12-15

    The current gold standard in the assessment of lateral intracranial dural arteriovenous fistulas (LDAVF) is digital subtraction angiography (DSA). However, magnetic resonance imaging (MRI) is a non-invasive emerging tool for the evaluation of such lesions. The aim of our study was to compare the DSA to our 3 T MR-imaging protocol including a highly spatial resolved (ce-MRA) and a temporal resolved (''time-resolved imaging of contrast kinetics'', TRICKS) contrast-enhanced MR angiography to evaluate if solely DSA can remain the gold-standard imaging modality for the treatment planning of LDAVF. We retrospectively reviewed matched pairs of DSA and 3 T MRI examinations of 24 patients with LDAVF (03/2008-04/2014) by the same list of relevant criteria for an endovascular LDAVF treatment planning. In particular, we determined intermodality agreement for the Cognard classification, the identifeication of arterial feeders, and the detailed assessment of each venous drainage pattern. Intermodality agreement for the Cognard classification was excellent (k = 1.0). Whereas MRI failed in identifying small arterial feeders, it was superior to the DSA in the assessment of the sinus and the venous drainage pattern. The combination of MRI and DSA is the new gold standard in LDAVF treatment planning. (orig.)

  20. Comprehensive MRA of the lower limbs including high-resolution extended-phase infra-inguinal imaging with gadobenate dimeglumine: Initial experience with inter-individual comparison to the blood-pool contrast agent gadofosveset trisodium

    International Nuclear Information System (INIS)

    Christie, A.; Chandramohan, S.; Roditi, G.

    2013-01-01

    Aim: To compare extended-phase imaging using an extracellular space contrast agent, gadobenate dimeglumine, to imaging with a blood-pool contrast agent, gadofosveset, for magnetic resonance angiography. Materials and methods: A lower-limb magnetic resonance angiography (MRA) protocol (dynamic crural, three-station bolus chase, and infra-inguinal high resolution) designed for blood-pool agent imaging was adapted for use with the extracellular agent, gadobenate dimeglumine, primarily by using a triphasic injection protocol. Ten patients scanned with gadofosveset were compared to 10 patients scanned with gadobenate. The dynamic, bolus chase, and high-resolution images were scored for quality on a Likert scale (from 1–5). Signal- and contrast-to-noise ratios were analysed, and Mann–Whitney U statistical analysis performed. Results: There was no significant difference for the dynamic imaging or the aorto-iliac station of the bolus chase. Infra-inguinal bolus chase images were higher quality (p < 0.05 Mann–Whitney U test) with gadobenate. Signal analysis confirmed lower signal and contrast for venous imaging on the high spatial resolution acquisitions with gadobenate; however, this allowed improved arterial conspicuity. Conclusion: Extended-phase imaging using an extracellular space contrast agent is feasible and provides image quality to equal imaging with a blood-pool contrast agent.

  1. Inter- and intra-breed comparative study of sperm motility and viability in Iberian and Duroc boar semen during long-term storage in MR-A and XCell extenders.

    Science.gov (United States)

    Martín-Hidalgo, D; Barón, F J; Robina, A; Bragado, M J; Llera, A Hurtado de; García-Marín, L J; Gil, M C

    2013-06-01

    During boar semen liquid preservation, extender is one of the factors that influence storage tolerance of spermatozoa. However, there are few studies about intra-breed variation in the preservation of semen quality during storage in different extenders. Similarly, boar breed is generally not considered a possible factor influencing variation in the semen storage tolerance in a particular extender. The aim of this study was to compare boar semen storage potential, in terms of the ability to maintain sperm viability and motility, of two currently used long-term extenders, MR-A and XCell. Extended semen from two breeds, Iberian and Duroc that had been stored at 17°C for up to 7 days was used. Intra- and inter-breed effect was studied. On Days 1, 4 and 7 (Day 0=day of semen collection), motility parameters and the percentage of total motile sperm and progressively motile sperm using a CASA system was evaluated. Viability (SYBR-14/PI) was evaluated by flow cytometry. Within each breed and for each storage day, there were differences between extenders, although semen tolerance to preservation was more influenced by the extender in the Iberian than in the Duroc breed. Neither breed nor extender influenced the percentage of viable spermatozoa during the storage time. Moreover, differences in motility parameters were observed between breeds, although the differences were greater when the XCell extender was used. In conclusion, both extender and breed influence motility characteristics of liquid-stored boar semen, so both aspects have to be considered in the design of comparative studies about stored boar semen quality from different breeds or with different extenders. Further studies are needed to corroborate these findings. Copyright © 2013 Elsevier B.V. All rights reserved.

  2. Your Radiologist Explains Magnetic Resonance Angiography (MRA)

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  1. Your Radiologist Explains Magnetic Resonance Angiography (MRA)

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  3. MRA of fibromuscular dysplasia in cervical vessels

    International Nuclear Information System (INIS)

    Link, J.; Steffens, J.C.; Mueller-Huelsbeck, S.; Brossmann, J.; Heller, M.

    1996-01-01

    In 386 selective angiograms of cervical vessels fibromuscular dysplasia was revealed in 4 female patients in the age of 30-54 years. FMD was located in the carotid artery (n=5) and in the vertebral artery (n=2) with a total of 8 lesions. 6/8 of the lesions of the seven cervical vessels were located typically in the mid cervical portion of the vessels and 2/6 lesions were located in the atlas loop of the vertebral artery. 4 lesions showed moderate stenosis and 4 vessels showed only mild stenosis. These patterns which demonstrated the typical morphology of fibromuscular dysplasia with alternating irregular zones of widening and narrowing were evaluated well with MR angiography, the others were missed. (orig./MG) [de

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  11. Bez vragov i nõntshe ne oboitiss / Aleksandr Tshaplõgin

    Index Scriptorium Estoniae

    Tšaplõgin, Aleksandr, 1964-

    2008-01-01

    Artikli autor pöördus parlamendis esindatud parteide juhtide poole, saamaks teada, millised on nende ootused vene rahvusest valijate suhtes peagi toimuvate Euroopa Parlamendi ja kohalike omavalitsuste valimiste eel

  12. Pljusõ i minusõ Jevropeiskogo Sojuza / Aleksandr Ikonnikov

    Index Scriptorium Estoniae

    Ikonnikov, Aleksandr

    2002-01-01

    Vene ajakirjanikele korraldatud briifing EL teemadel: EL fonde ja programme tutvustas rahandusministeeriumi asekantsler Rinaldo Mändmets. Eestis elavate vene elanike toetust liitumisele kommenteerib Paavo Palk Riigikantseleist

  13. Splav ostroumija, delovitosti i dobrotõ / Vladimir Volohhonski ; interv. Aleksandr Ikonnikov

    Index Scriptorium Estoniae

    Volohhonski, Vladimir, 1948-2013

    2008-01-01

    AS DBT (Dry Bulk Terminal) juhatuse esimees oma senisest karjäärist, Muuga ja Paldiski sadamast, Sillamäe keemiaveoste terminalist, Ust-Luga sadamast, transiitkaubandusest ja reisijateveost, jalgpalli rollist oma elus, heategevusest, perekonnast ja lastest

  14. Paindlik tootearendus läbi tehniliste muudatuste haldamise süsteemi / Aleksandr Miina

    Index Scriptorium Estoniae

    Miina, Aleksandr, 1979-

    2004-01-01

    Autori hinnangul vajab tootearendusprotsess head koostööd tehniliste muudatuste haldamise süsteemiga, mis võimaldab teha kiiresti arendustöid, parandusi ning võtta neid kasutusele ilma lisakuludeta. Skeemid

  15. Õigeusu kiriku arhitektuur Eestis 16.-18. sajandil / Aleksandr Pantelejev

    Index Scriptorium Estoniae

    Pantelejev, Aleksandr

    2005-01-01

    Tallinna Püha Nikolai kirik. Tallinnas Rootsi Mihkli, Narvas saksa Maarja (ikonostaasi teostas Jacob Leu, u. 1708) ja rootsi Jaani kiriku ümberehitamine õigeusu kirikuteks. Ikonostaaside kavandamisel osalesid Ivan Zarudnõi Tallinnas ja arvatavasti Dominico Trezzini (1670-1734) Narvas. Polgukirikud. Pärnu Püha Jekaterina õigeusu kirik (arhitekt Pjotr Jegorov, 1765-1768). Bibliograafia lk. 460

  16. Kogda investitsionnõi dozhd prevratitsja v liven? / Aleksandr Fedotov, Sigitas Pashilaitis, Dmitri Kulikov

    Index Scriptorium Estoniae

    Fedotov, Aleksandr

    2006-01-01

    Ilmunud ka: The Baltic Course 2007 Winter (nr. 24) lk. 20-24. Põhjalik ülevaade välisinvesteeringutest Eestisse, Lätisse ja Leedusse. Diagrammid: Investeeringute struktuurid. Tabelid: Investeerimisprojektid

  17. Rusaj autoroj en "Fundamenta Krestomatio" / Aleksandr D. Dulichenko ; tõlkinud V. Devjatnin

    Index Scriptorium Estoniae

    Dulichenko, Aleksandr D.

    2003-01-01

    Esperantokeelsest kogumikust "Fundamenta Krestomatio de la lingvo Esperanto" (Rickmansworth : The Esperanto Publishing, 1954). Sisaldab M. Lermontovi luuletuse "Ingel" ja A. Puškini luuletuse "Husaar" esperantokeelseid tõlkeid, tlk. V. Devjatnin

  18. Samm efektiivsuse poole - väärtusahela kaardistamine / Aleksandr Miina

    Index Scriptorium Estoniae

    Miina, Aleksandr, 1979-

    2007-01-01

    Ilmunud ka: Delovõje Vedomosti : Promõshlennost 20. veebr. 2008 lk. 7. Väärtusahela kaardistamine on kulusäästliku tootmise meetod, mis koosneb kahest etapist. Esmalt luuakse ettevõtte hetkeseisu kaart (Present State Map), mille analüüsi tulemusena kujundatakse tulevikuseisu kaart (Future State Map). Lisa: Väärtusahela kaardistamine; Asjaolud, mis ei lisa tootmisprotsessi väärtust

  19. Ne tolko Baba-Jaga bõvajet protiv / Aleksandr Perelõgin ; interv. Mihhail Petrov

    Index Scriptorium Estoniae

    Perelõgin, Aleksandr

    2000-01-01

    Baltimaades elavate venelaste haridust toetava nõukogu istung pidi Tallinna asemel Riias toimuma, sest nõukogu sekretär V. Mamjan ei saanud Eesti viisat. V. Andrejevi kommentaar. Parlamendisaadik (V. Andrejev)

  20. [Aleksandr Gavrilin: Latvijskie pravoslavnye svjaščennoslužiteli na amerikanskom kontinente] / Tõnu Tannberg

    Index Scriptorium Estoniae

    Tannberg, Tõnu, 1961-

    2014-01-01

    Arvustus: Гаврилин, Александр. Латвийские православные свяченнослужители на Американском континенте (Материалы по истории церкви, 49). Общество любителей церковной истории. Москва 2013

  1. Kaks humanismi : minimalistlik ja maksimalistlik inimesekäsitlus / Aleksandr Dugin ; tõlk. Haljand Udam

    Index Scriptorium Estoniae

    Dugin, Aleksandr

    2001-01-01

    Humanismi kaks tahku - minimaalne humanism käsitab inimest kui potensiaalset jumalat, minimaalne humanism käsitab inimest kui aktuaalset jäävat suurust. Lisa: A. Dugini loomingu ülevaade ja meelisteemad

  2. "Bizkon" pomogajet razvivat prigranitshnoje sotrudnitshestvo i mezhdunarodnõje biznes-kontaktõ / Aleksandr Komshin

    Index Scriptorium Estoniae

    Komshin, Aleksandr

    2008-01-01

    Kohtla-Järvel toimunud rahvusvahelisel seminaril räägiti piirikoostöö arendamisest ning Eesti, Soome ja Venemaa väikese- ja keskmise ettevõtluse toetusest regionaalsel tasandil. Seminar toimus kohaliku omavalitsuse ja Sankt-Peterburgi أBIZKONؤ ärikeskuse koostöö raames

  3. Elementõ polititsheskoi mifologii Tjuttsheva (kommentari k state 1844 g.) / Aleksandr Ospovat

    Index Scriptorium Estoniae

    Ospovat, Aleksandr

    1999-01-01

    Bibl. lk. 259-263. Kokkuvõte inglise k. lk. 321. Kiri ajalehe "Allgemeine Zeitung" (Augsburg) toimetajale Gustav Kolbile (1844, prantsuse k.). Artikli venek. versioon (pealk. "Venemaa ja Saksamaa") publitseeriti ajakirjas Russki arhiv (1873, nr. 10)

  4. Sem saperov i tshetõre sobaki - vklad v delo zashtshitõ demokratii / Aleksandr Shegedin

    Index Scriptorium Estoniae

    Shegedin, Aleksandr

    2003-01-01

    Siseministeeriumis toimus pidulik vastuvõtt Afganistanis missioonil viibinud demineerijate autasustamiseks. Üritusel viibisid peaminister Siim Kallas, kaitseminister Sven Mikser ja USA suursaadik Joseph deThomas

  5. "Suveöö kui kiisu vagalt ..." : [luuletused] / Aleksandr Martõnov

    Index Scriptorium Estoniae

    Martõnov, Aleksandr

    2004-01-01

    Sisu: "Suveöö kui kiisu vagalt ..." ; "Teede ääres lumehanged ..." ; Kui hea ... ; Las ma lähen ... ; "Võtsin põlluteed ma minna ..." ; "Ei valgus mulle taevast tule ..." ; Tõsta mind, elu! .... Andmeid autori kohta lk. 39. Luuletused paralleelselt eesti ja ersa keeles

  6. Armin Karu : "Vakhanalija azarta - tolko v ljubimoi rabote!" / Armin Karu ; interv. Aleksandr Ikonnikov

    Index Scriptorium Estoniae

    Karu, Armin, 1965-

    2008-01-01

    ASi Olympic Entertainment Group juhatuse esimees oma sport- ja hasartmängude eelistustest, edukusest, jõukusest, tulevikuplaanidest, kasiinode riigistamisest. Lisad: Armin Karu; Bill Gates on Armin Karust "vaesem"; Armin Karu teatas majanduskonverentsil "Äriplaan 2008": Pokkeriturism kasvab hoogsalt

  7. Samozvantsev nam ne nado, komandirom budu ja / Maksim Shmeljov, Aleksandr Tshaplõgin, Leivi Sher

    Index Scriptorium Estoniae

    Shmeljov, Maksim

    2007-01-01

    Kas Konstitutsioonipartei nimekirjas parlamendivalimistel kandideeriv Dmitri Linter ja tema kaaslased võivad kasutada liikumise Notshnoi dozor brändi ND omakasupüüdlikel eesmärkidel, küsivad autorid

  8. Filmitäht Johnny Depp hakkab Aleksandr Litvinenkost filmi tegema / M. P.

    Index Scriptorium Estoniae

    M. P.

    2007-01-01

    Populaarse näitleja Johnny Deppi filmistuudio Infinitum Nihil teeb põnevusfilmi näitlejaga peaosas vene hiljuti plutooniumimürgitusse surnud dissidentliku luuraja A. Litvinenko elust, aluseks veel ilmumata Alan Cowelli raamat "Sasha lugu : Vene spiooni elu ja surm"

  9. Interventional MRA: concepts for active visualization of catheters and stents

    International Nuclear Information System (INIS)

    Quick, H.H.; Ladd, M.E.

    2003-01-01

    A precondition to safe guidance of vascular guidewires and catheters during the course of magnetic resonance (MR)-guided vascular intervention is a high-contrast visualization of the instruments. The integration of miniature radiofrequency (RF) coils and coaxial cables into guidewires and catheters enables the reception of RF signal from the lumen of blood vessels, and thus the active visualization of the instruments. Moreover, metallic vascular implants (stents) can be modified to act as intravascular RF antennas that inductively couple their RF signal to a conventional surface RF coil. Such stent resonators show signal amplification inside the lumen of the stent and thus can be visualized with high contrast in MR images. Furthermore, once such a device has been implanted, the method offers the potential for non-invasive long-term follow-up of the stent patency. (orig.) [de

  10. MRA Based Efficient Database Storing and Fast Querying Technique

    Directory of Open Access Journals (Sweden)

    Mitko Kostov

    2017-02-01

    Full Text Available In this paper we consider a specific way of organizing 1D signals or 2D image databases, such that a more efficient storage and faster querying is achieved. A multiresolution technique of data processing is used in order of saving the most significant processed data.

  11. Estonian russification of non-russian ethnic minorities in Estonia? : A policy analysis / Aleksandr Aidarov, Wolfgang Drechsler

    Index Scriptorium Estoniae

    Aidarov, Aleksandr

    2013-01-01

    Aastatel 1945-1990 koos venelastega Eestisse immigreerunud etniliste vähemuste assimileerumisest eesti vene kultuuri peale 1991. aastat. Poliitilistes vahenditest, mida Eesti Valitsus rakendab etniliste vähemuste erisuste säilitamiseks.

  12. Estonskoje võssheje obrazovanije : pervõi god v JeS / Mark Levin ; interv. Aleksandr Shegedin

    Index Scriptorium Estoniae

    Levin, Mark

    2005-01-01

    Eesti-Ameerika Ärikolledzhi rektor olukorrast kõrghariduses peale Eesti liitumist Euroopa Liiduga, muudatuste vajalikkusest kõrgharidussüsteemis, rakenduskõrgharidusest ja riigi suhtumisest erarakenduskõrgkoolidesse, praeguste abiturientide haridustasemest

  13. Kui kaua kestis Liivi sõda? / Aleksandr Filjuškin ; tõlkinud Jüri Ojamaa

    Index Scriptorium Estoniae

    Filjuškin, Aleksandr, 1970-

    2015-01-01

    Liivi sõja erinevatest kronoloogilistest raamidest. Sagedased konfliktid piirialadel olid 16. sajandil tavalised. Nimetust Liivi sõda kasutas esimesena Tilmann Bredebach. Liivi sõjast Baltikumis on kirjutatud neli kroonikat: Johann Renneri kroonika, Balthasar Russowi kroonika, Solomon Henningi kroonika ja Franz Nyensstedti kroonika. Liivi sõja etappidest. Artikli autor eelistaks väljakujunenud kronoloogiliste raamide asemel rääkida Balti sõdadest aastatel 1555-1595

  14. Edgar Savisaar : "Nam vmeste reshat problemõ i nahhodit kompromissõ ..." / Edgar Savisaar ; interv. Aleksandr Ikonnikov

    Index Scriptorium Estoniae

    Savisaar, Edgar, 1950-

    2008-01-01

    Tallinna linnapea Edgar Savisaar Eesti ja Tallinna arengust pärast taasiseseisvumist, ettevõtlusest ja selle soodustamisest pealinnas, tähtsamatest ehitusobjektidest Tallinnas 2007. ja 2008. aastal

  15. Der Diskurs von der Notwendigkeit des Durchbruchs zur Ostsee in der russischen Geschichte und Historiographie / Aleksandr Filjuškin

    Index Scriptorium Estoniae

    Filjuškin, Aleksandr

    2004-01-01

    Venemaa Läänemerele juurdepääsu soovi formuleerimisest ja käsitlusest Lääne-Euroopa allikates ning Venemaa ajalooteaduses ehk "akna läände raiumise" teema arengust 16. - 20. sajandini. Idee teostamisega kaasnenud ideoloogiast Peeter I ajal. Läänemere kaubanduse problemaatikast varauusajal

  16. Dual origin of the left vertebral artery: extracranial MRA and CTA findings.

    LENUS (Irish Health Repository)

    Tobin, W Oliver

    2012-02-01

    A 48-year-old man presented with a posterior circulation stroke secondary to left lateral medullary infarction. Contrast-enhanced magnetic resonance angiography (CEMRA) revealed 40-45% intracranial left vertebral artery stenosis, likely atherosclerotic in nature. CEMRA and subsequent computed tomography angiography also identified a duplicate origin of the left vertebral artery. The importance of recognition of this rare anatomical variant, its potential contribution to stroke aetiology, and the advantage of non-invasive vascular imaging prior to catheter angiography is emphasised.

  17. Intracranial MRA: single volume vs. multiple thin slab 3D time-of-flight acquisition.

    Science.gov (United States)

    Davis, W L; Warnock, S H; Harnsberger, H R; Parker, D L; Chen, C X

    1993-01-01

    Single volume three-dimensional (3D) time-of-flight (TOF) MR angiography is the most commonly used noninvasive method for evaluating the intracranial vasculature. The sensitivity of this technique to signal loss from flow saturation limits its utility. A recently developed multislab 3D TOF technique, MOTSA, is less affected by flow saturation and would therefore be expected to yield improved vessel visualization. To study this hypothesis, intracranial MR angiograms were obtained on 10 volunteers using three techniques: MOTSA, single volume 3D TOF using a standard 4.9 ms TE (3D TOFA), and single volume 3D TOF using a 6.8 ms TE (3D TOFB). All three sets of axial source images and maximum intensity projection (MIP) images were reviewed. Each exam was evaluated for the number of intracranial vessels visualized. A total of 502 vessel segments were studied with each technique. With use of the MIP images, 86% of selected vessels were visualized with MOTSA, 64% with 3D TOFA (TE = 4.9 ms), and 67% with TOFB (TE = 6.8 ms). Similarly, with the axial source images, 91% of selected vessels were visualized with MOTSA, 77% with 3D TOFA (TE = 4.9 ms), and 82% with 3D TOFB (TE = 6.8 ms). There is improved visualization of selected intracranial vessels in normal volunteers with MOTSA as compared with single volume 3D TOF. These improvements are believed to be primarily a result of decreased sensitivity to flow saturation seen with the MOTSA technique. No difference in overall vessel visualization was noted for the two single volume 3D TOF techniques.

  18. Kemikaalipoliitika ja regulatsioonide suundumused XXI sajandi algul : [bakalaureusetöö] / Tiina Titma ; Tartu Ülikool, õigusteaduskond ; juhendaja: Aleksandr Popov

    Index Scriptorium Estoniae

    Titma, Tiina

    2010-01-01

    Kemikaalidealaste regulatsioonide mõjuritest ja valdkonna arengust, kemikaalide käitlust ja kasutamist reguleerivatest peamistest riiklikest või rahvusvahelistest organisatsioonidest (Euroopa Toiduohutusamet, Euroopa Ravimiamet, Euroopa Kemikaaliamet, Toidu- ja Ravimiamet, Keskkonnakaitse Amet), rahvusvaheliste regulatsioonide ja kokkulepete arengustmaailmas 20. ja 21. sajandil

  19. Doing new things with language: Narrative language in SLI preschoolers Ingrida Balčiūnienė, Aleksandr N. Kornev

    Directory of Open Access Journals (Sweden)

    Ingrida Balčiūnienė

    2016-05-01

    Full Text Available The paper deals with micro- and macrostructural static and dynamic narrative characteristics in specifically language-impaired (SLI Russian-speaking preschool children and their typically-developing (TD peers. The study was based on experimental data that included storytelling and retelling elicited by means of wordless picture sequences. First, individual measures of story structure, episode com- pleteness, internal state terms, story productivity, lexical diversity, and syntactic complexity, as well as the percentage of linguistic dysfluencies and errors, were evaluated and compared between the experimental and control groups. Second, the impact of such factors as session (1st vs. 2nd, story complexity, and mode (telling vs. retelling on the dynamic variation of micro- and macrostructural narrative measures was evaluated. Our results highlighted essential dynamic differences between the samples from the perspective of narrative structure, structural complexity, grammaticality, and vocabulary.

  20. Klišeed muusikas ja filmis : kontsert, mis rõhub nostalgiale / Brigitta Davidjants

    Index Scriptorium Estoniae

    Davidjants, Brigitta, 1983-

    2005-01-01

    Põhjamaade Sümfooniaorkestri kontsert Anu Tali juhatusel Keila lauluväljakul "Russkoje kino - "Aleksandr Nevski", kus esitati vene nõukogude filmimuusikat ning lühendatud versioon Sergei Eisensteini filmist "Aleksandr Nevski" koos Sergei Prokofjevi filmiainelise kantaadiga

  1. Ves aprel "Aprelju" ver / Lidija Tolmatshova

    Index Scriptorium Estoniae

    Tolmatshova, Lidija

    2001-01-01

    Kunstnike rühmituse "Aprill" - Aleksandr ja Nadezhda Popolitov, Vladislav ja Jelena Kuznetsov, Tatjana Petsheritsa, Igor Lukjanov, Sergei Kolesnikov, Aleksandr Orlov, Eduard Zentshik, Vladimir Zujev, German Jershov - näituse avamisest Sillamäel kehamaalingutega

  2. Golõshom i publitshno / Sofja Bauer, Tiia Linnard

    Index Scriptorium Estoniae

    Bauer, Sofia, 1947-2001

    1998-01-01

    Ida-Virumaa kunstnike kevadnäitusest Jõhvis, kujundas Aleksandr Igonin. Tutvustatakse osalevaid kunstnikke : Kalev Prits (Pump), Aleksandr Igonin, Aira ja Mati Rautso, Ljudmila Maisurjan, Andres Malõgin, Irja Annus, Juri Horev jt.

  3. Die russische baltische Historiographie in der zweiten Hälfte des 19. und zu Beginn des 20. Jahrhunderts / Tiit Rosenberg

    Index Scriptorium Estoniae

    Rosenberg, Tiit, 1946-

    2005-01-01

    Vene balti historiograafiast 19. sajandi teisel poolel ja 20. saj. algul. Evgraf Tsheshihhin, Joann Jürgens, Georgi Forsten, Vassili Blagoveshtshenski, Stepan Sivitski, Vassili Ivanov, Aleksandr Nevzorov, Aleksandr Brückner, Anton Budilovitsh, Aleksandr Tshumikov, Ivan Lutshitski, Konstantin Vojenski jt.

  4. Senzorická analýza mražených krémů

    OpenAIRE

    Siatková, Monika

    2014-01-01

    The theme of this diploma is sensory analysis of ice creams. This work is divided into theoretical and practical part. In theoretical part, there is described the history of knowledge of ice cream, ingredients, which are needed for the production and requests for quality of this ingrediens. Production, packing, right storing and transportation of ice cream are described in details. In this work, there are also described requests for quality of ice cream, defects, dividing, health aspects conn...

  5. Optimization of imaging before pulmonary vein isolation by radiofrequency ablation: breath-held ungated versus ECG/breath-gated MRA

    Energy Technology Data Exchange (ETDEWEB)

    Allgayer, C.; Haller, S.; Bremerich, J. [University Hospital Basel, Department of Radiology, Basel (Switzerland); Zellweger, M.J.; Sticherling, C.; Buser, P.T. [University Hospital Basel, Department of Cardiology, Basel (Switzerland); Weber, O. [University Hospital Basel, Department of Medical Physics, Basel (Switzerland)

    2008-12-15

    Isolation of the pulmonary veins has emerged as a new therapy for atrial fibrillation. Pre-procedural magnetic resonance (MR) imaging enhances safety and efficacy; moreover, it reduces radiation exposure of the patients and interventional team. The purpose of this study was to optimize the MR protocol with respect to image quality and acquisition time. In 31 patients (23-73 years), the anatomy of the pulmonary veins, left atrium and oesophagus was assessed on a 1.5-Tesla scanner with four different sequences: (1) ungated two-dimensional true fast imaging with steady precession (2D-TrueFISP), (2) ECG/breath-gated 3D-TrueFISP, (3) ungated breath-held contrast-enhanced three-dimensional turbo fast low-angle shot (CE-3D-tFLASH), and (4) ECG/breath-gated CE-3D-TrueFISP. Image quality was scored from 1 (structure not visible) to 5 (excellent visibility), and the acquisition time was monitored. The pulmonary veins and left atrium were best visualized with CE-3D-tFLASH (scores 4.50 {+-} 0.52 and 4.59 {+-} 0.43) and ECG/breath-gated CE-3D-TrueFISP (4.47 {+-} 0.49 and 4.63 {+-} 0.39). Conspicuity of the oesophagus was optimal with CE-3D-TrueFISP and 2D-TrueFISP (4.59 {+-} 0.35 and 4.19 {+-} 0.46) but poor with CE-3D-tFLASH (1.03 {+-} 0.13) (p < 0.05). Acquisition times were shorter for 2D-TrueFISP (44 {+-} 1 s) and CE-3D-tFLASH (345 {+-} 113 s) compared with ECG/breath-gated 3D-TrueFISP (634 {+-} 197 s) and ECG/breath-gated CE-3D-TrueFISP (636 {+-} 230 s) (p < 0.05). In conclusion, an MR imaging protocol comprising CE-3D-tFLASH and 2D-TrueFISP allows assessment of the pulmonary veins, left atrium and oesophagus in less than 7 min and can be recommended for pre-procedural imaging before electric isolation of pulmonary veins. (orig.)

  6. Evaluation of lesions of the internal ligaments of the wrist; conventional magnetic resonance imaging versus MR arthrography (MRA

    Directory of Open Access Journals (Sweden)

    Heba Ahmed Kamal

    2014-09-01

    Conclusion: MR arthrography is a potent additional tool facilitating the diagnosis of different pathologic entities affecting the major internal ligaments of the wrist joint and helps to reduce arthroscopic interventions.

  7. A wavelet-MRA-based adaptive semi-Lagrangian method for the relativistic Vlasov-Maxwell system

    International Nuclear Information System (INIS)

    Besse, Nicolas; Latu, Guillaume; Ghizzo, Alain; Sonnendruecker, Eric; Bertrand, Pierre

    2008-01-01

    In this paper we present a new method for the numerical solution of the relativistic Vlasov-Maxwell system on a phase-space grid using an adaptive semi-Lagrangian method. The adaptivity is performed through a wavelet multiresolution analysis, which gives a powerful and natural refinement criterion based on the local measurement of the approximation error and regularity of the distribution function. Therefore, the multiscale expansion of the distribution function allows to get a sparse representation of the data and thus save memory space and CPU time. We apply this numerical scheme to reduced Vlasov-Maxwell systems arising in laser-plasma physics. Interaction of relativistically strong laser pulses with overdense plasma slabs is investigated. These Vlasov simulations revealed a rich variety of phenomena associated with the fast particle dynamics induced by electromagnetic waves as electron trapping, particle acceleration, and electron plasma wavebreaking. However, the wavelet based adaptive method that we developed here, does not yield significant improvements compared to Vlasov solvers on a uniform mesh due to the substantial overhead that the method introduces. Nonetheless they might be a first step towards more efficient adaptive solvers based on different ideas for the grid refinement or on a more efficient implementation. Here the Vlasov simulations are performed in a two-dimensional phase-space where the development of thin filaments, strongly amplified by relativistic effects requires an important increase of the total number of points of the phase-space grid as they get finer as time goes on. The adaptive method could be more useful in cases where these thin filaments that need to be resolved are a very small fraction of the hyper-volume, which arises in higher dimensions because of the surface-to-volume scaling and the essentially one-dimensional structure of the filaments. Moreover, the main way to improve the efficiency of the adaptive method is to increase the local character in phase-space of the numerical scheme, by considering multiscale reconstruction with more compact support and by replacing the semi-Lagrangian method with more local - in space - numerical scheme as compact finite difference schemes, discontinuous-Galerkin method or finite element residual schemes which are well suited for parallel domain decomposition techniques

  8. Feasibility of navigator setting on the left diaphragm for whole-heart coronary MRA. A study in healthy volunteers

    International Nuclear Information System (INIS)

    Watanabe, Kunihiro; Suzuki, Takayoshi; Maruyama, Kazuhiro; Noda, Mayumi; Fujita, Mitsuo; Morita, Satoru; Ohnishi, Takahiro

    2009-01-01

    We prospectively compared the quality of images obtained by navigator setting on the left and right diaphragm on whole-heart coronary magnetic resonance angiography (WHCMRA). In 10 healthy volunteers, we performed free-breathing, 3-dimensional segmented true fast imaging with steady-state precession (trueFISP) WHCMRA by setting the navigator on the left and right diaphragm in random order. For the left diaphragm, we set the navigator outside the scope of the heart to avoid the influence on coronary arteries. We compared image acquisition time and visible length of coronary arteries using paired t-test and subjective image quality on a 4-point scale (1, poor; 4, excellent) using Wilcoxon signed-rank test. Mean overall subjective image quality was significantly better in the left diaphragm than the right (3.3±0.7 versus 2.9±0.9, P=0.02). Mean overall visible length of the coronary arteries was significantly better in the left diaphragm than the right (115.4±31.1 vs. 112.6±29.9 mm, P=0.02). Mean acquisition time between the left and right diaphragm was not significantly different (15.6±5.0 versus 16.0±5.7 min, P=0.79). In this small group of healthy volunteers, navigator setting for WHCMRA was superior on the left diaphragm than the right; however, feasibility of the technique requires additional consideration in a larger group of actual patients. (author)

  9. All-phase MR angiography using independent component analysis of dynamic contrast enhanced MRI time series. φ-MRA

    International Nuclear Information System (INIS)

    Suzuki, Kiyotaka; Matsuzawa, Hitoshi; Watanabe, Masaki; Nakada, Tsutomu; Nakayama, Naoki; Kwee, I.L.

    2003-01-01

    Dynamic contrast enhanced magnetic resonance imaging (dynamic MRI) represents a MRI version of non-diffusible tracer methods, the main clinical use of which is the physiological construction of what is conventionally referred to as perfusion images. The raw data utilized for constructing MRI perfusion images are time series of pixel signal alterations associated with the passage of a gadolinium containing contrast agent. Such time series are highly compatible with independent component analysis (ICA), a novel statistical signal processing technique capable of effectively separating a single mixture of multiple signals into their original independent source signals (blind separation). Accordingly, we applied ICA to dynamic MRI time series. The technique was found to be powerful, allowing for hitherto unobtainable assessment of regional cerebral hemodynamics in vivo. (author)

  10. Usefulness of 3D-CE renal artery MRA using parallel imaging with array spatial sensitivity encoding technique (ASSET)

    International Nuclear Information System (INIS)

    Shibasaki, Toshiro; Seno Masafumi; Takoi, Kunihiro; Sato, Hirofumi; Hino, Tsuyoshi

    2003-01-01

    In this study of 3D contrast enhanced MR angiography of the renal artery using the array spatial sensitivity encoding technique (ASSET), the acquisition time per 1 phase shortened fairly. And using the technique of spectral inversion at lipids (SPECIAL) together with ASSET, the quality of image was improved by emphasizing the contrast. The timing of acquisition was determined by the test injection. We started acquiring the MR angiography 2 seconds after the arrival of maximum enhancement of the test injection at the upper abdominal aorta near the renal artery. As a result parenchymal enhancement was not visible and depiction of the segmental artery was possible in 14 (82%) of 17 patients. At the present time we consider it better not to use the Fractional number of excitation (NEX) together with ASSET, as it may cause various artifacts. (author)

  11. Whole-heart coronary MRA with 3D affine motion correction using 3D image-based navigation.

    Science.gov (United States)

    Henningsson, Markus; Prieto, Claudia; Chiribiri, Amedeo; Vaillant, Ghislain; Razavi, Reza; Botnar, René M

    2014-01-01

    Robust motion correction is necessary to minimize respiratory motion artefacts in coronary MR angiography (CMRA). The state-of-the-art method uses a 1D feet-head translational motion correction approach, and data acquisition is limited to a small window in the respiratory cycle, which prolongs the scan by a factor of 2-3. The purpose of this work was to implement 3D affine motion correction for Cartesian whole-heart CMRA using a 3D navigator (3D-NAV) to allow for data acquisition throughout the whole respiratory cycle. 3D affine transformations for different respiratory states (bins) were estimated by using 3D-NAV image acquisitions which were acquired during the startup profiles of a steady-state free precession sequence. The calculated 3D affine transformations were applied to the corresponding high-resolution Cartesian image acquisition which had been similarly binned, to correct for respiratory motion between bins. Quantitative and qualitative comparisons showed no statistical difference between images acquired with the proposed method and the reference method using a diaphragmatic navigator with a narrow gating window. We demonstrate that 3D-NAV and 3D affine correction can be used to acquire Cartesian whole-heart 3D coronary artery images with 100% scan efficiency with similar image quality as with the state-of-the-art gated and corrected method with approximately 50% scan efficiency. Copyright © 2013 Wiley Periodicals, Inc.

  12. Arvo Pärt: Kui kannatab üks inimene, siis kannatab kogu maailm! / Arvo Pärt, Nora Pärt ; intervjueerinud Yana Toom, Maarja-Liis Arujärv, Aleksandr Zukerman ; kommenteerinud Edgar Savisaar

    Index Scriptorium Estoniae

    Pärt, Arvo, 1935-

    2010-01-01

    Arvo Pärt ja tema abikaasa Nora Pärt andsid Türgis enne Pärdi uudisteose "Aadama itk" esiettekannet intervjuu, kus rääkisid nii nende raskustest Läände elama asumisel kui uudisteose sügavamast mõttest

  13. Vaidluste lahendamine ning lahendite läbivaatuse eesmärk ICSID süsteemis : [bakalaureusetöö] / Tanel Ader ; Tartu Ülikool, õigusteaduskond ; juhendaja: Aleksandr Popov

    Index Scriptorium Estoniae

    Ader, Tanel

    2012-01-01

    ICSID (Rahvusvaheline Investeerimisvaidluste Lahendamise Keskus = International Centre for Settlement of Investment Disputes) eelsest õiguslikust olukorrast, konventsiooni eesmärkidest, Maailmapanga põhimõtete täitmisest, kahjutasu tunnustamisest ja väljanõudmisest, riikide suveräänsest puutumatusest

  14. Cloud amount/frequency, NITRATE and other data from STRANGER, AKADEMIK ALEKSANDR NESMEYANOV and other platforms in the South China Sea from 1947-12-07 to 1988-03-08 (NODC Accession 9200011)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Ocean Serial data in this accession was collected in South China Sea (Nan Hai), TOGA Area - Pacific (30 N to 30 S) as part of Tropical Ocean Global Atmosphere...

  15. On Hungarian and Slavic linguistics in the collection of papers dedicated to Mihály Péter / Aleksandr Dulitšenko, Szilárd Tóth

    Index Scriptorium Estoniae

    Dulitšenko, Aleksandr, 1941-

    1999-01-01

    Arvustus: Nyelv, stílus, irodalom : köszöntö könyv Péter Mihįly 70. születésnapjára / Banczerowski Janusz, Han Anna, Kassai Ilona, Nyomįrkay Istvįn közremuködésével szerkesztette Zoltán András. Budapest : ELTE BTK Keleti Szláv és Balti Filológiai Tanszék, 1998

  16. Aleksandr Dugin’s transformation from a lunatic fringe figure into a mainstream political publicist, 1980–1998: A case study in the rise of late and post-Soviet Russian fascism

    Directory of Open Access Journals (Sweden)

    Andreas Umland

    2010-07-01

    Biographical sketch: CertTransl (Leipzig, MA (Stanford, MPhil (Oxford, DipPolSci, DrPhil (FU Berlin, PhD (Cambridge. Visiting fellow at Stanford’s Hoover Institution in 1997–1999, and Harvard’s Weatherhead Center in 2001–2002. Bosch visiting lecturer at Yekaterinburg’s Urals State University in 1999–2001, and Kyiv’s Mohyla Academy in 2003/2005. In January-December 2004, temporary lecturer in Russian and East European studies at St. Antony’s College Oxford. In 2005–2008, German Academic Exchange Service (DAAD Lecturer Kyiv’s Shevchenko University. Papers in Problems of Post-Communism, East European Jewish Affairs, Osteuropa, Österreichische Zeitschrift für Politikwissenschaft, Politicheskie issledovaniya, European Political Science, Political Studies Review, The Journal of Slavic Military Studies, Voprosy filosofii, Obshchestvennye nauki i sovremennost’, Forum für osteuropäische Ideen- und Zeitgeschichte, Ab Imperio and other journals. Editor of The Implementation of the European Convention on Human Rights in Russia: Philosophical, Legal und Empirical Studies (Stuttgart: Ibidem 2004, Geistes- und Sozialwissenschaftliche Hochschullehre in Osteuropa. Vols. 1, 2, 3 & 4 (Frankfurt a.M. u.a.: Peter Lang 2005, 2006, 2007 & 2009, and, with Roger Griffin and Werner Loh, Fascism Past and Present, West and East: An International Debate on Concepts and Cases in the Comparative Study of the Extreme Right. With an afterword by Walter Laqueur (Stuttgart: Ibidem-Verlag 2006.

  17. Альманах В. Брюсова "Русские символисты": судьбы участников / Евгения Иванова, Рем Щербаков

    Index Scriptorium Estoniae

    Иванова, Евгения

    2000-01-01

    Järgmistest Valeri Brjussovi almanahhi "Русские символисты" (1894-1895, 3 numbrit) kaasautoritest: A. L. Miropolski (õieti Aleksandr Lang), Erla Martov (õieti Andrei Bugon), Viktor Hrissonopulo, N. Novitš (õieti Nikolai Bahtin), Grigori Zaronin (õieti Aleksandr Gippius), Aleksandr Dobroljubov, Vladimir Gippius. Kirjastaja Vladimir Aleksandrovitš Maslov ja osa kaasautoreid olid müstifitseeritud

  18. Aja sõltlased - kes kus : Elmo Nüganeni 'Pianoola ehk Mehhaaniline klaver' Tallinna Linnateatris / Lauri Kärk

    Index Scriptorium Estoniae

    Kärk, Lauri, 1954-

    1996-01-01

    Anton Tšehhovi - Aleksandr Adabashjani - Nikita Mihhalkovi 'Pianoola ehk Mehhaaniline klaver' Tallinna Linnateatris, lav. E. Nüganen. Võrdlus N. Mihhalkovi filmiga 'Lõpetamata pala pianoolale' (1977)

  19. V osnovu filma-baleta "Limonov" ljazhet ne muzõka, a gorodskije shumõ

    Index Scriptorium Estoniae

    2003-01-01

    Teleajakirjaniku Aleksandr Orlovi eestvedamisel on plaanis film-ballett "Limonov" Vene Natsionaal-Boshevistliku Partei liidri Eduard Limonovi varasest proosateosest "Luuseri päevik" ("Dnevnik neudatshnika")

  20. J.A.P. Style - killuke rõivailu / Kai Ilustrumm

    Index Scriptorium Estoniae

    Ilustrumm, Kai

    2004-01-01

    Moekunstnike Janina Pasti (õppinud arhitektuuri, sisekujundust, graafikat) ja Aleksandr Pasti (ka ajakirjanik, fotoreporter) firmast J.A.P.Style ja uuest kollektsioonist. Inspiratsiooni saavad Versace loomingust

  1. Dom, kotorõi postroil Iljin / Ella Agranovskaja

    Index Scriptorium Estoniae

    Agranovskaja, Ella, 1950-

    2005-01-01

    Viimased neli aastat on Vene Kultuurikeskuse direktoriks olnud Aleksandr Iljin. Vene Kultuurikeskusest on saanud arvestatav Tallinna kultuurikeskus. Kommenteerivad Riigikogu liikmed Ago-Endrik Kerge ja Jaak Allik

  2. Visitor from a parallel world / Rokas M. Tracevskis

    Index Scriptorium Estoniae

    Tracevskis, Rokas M.

    2009-01-01

    Valgevene president Aleksandr Lukashenko kohtus Vilniuses Leedu presidendi Dalia Grybauskaitega . Valgevene opositsioon kohtus Leedu peaministri Andrius Kubiliuse ja Leedu välisministri Vygaudas Usackasega

  3. Abiks algajatele anarhistidele / Ants Juske

    Index Scriptorium Estoniae

    Juske, Ants, 1956-2016

    2000-01-01

    Moskvas kirjastuselt "Gileia" 1999. a. ilmunud Aleksandr Breneri ja Barbara Schurzi raamatust "Mida teha? 54 tehnoloogiat kultuuriliseks vastupanuks võimusuhetele hilises kapitalismis". Vastupanu Eestis

  4. Uvidet heruvima / Boris Bernstein

    Index Scriptorium Estoniae

    Бернштейн, Борис, 1924-2015

    2006-01-01

    Inglite kujundi loomisest euroopalike traditsioonide baasil. Inglite kujutamine Euroopa kunstis. Vaadeldud Jean Fouquet, Benozzo Gozzoli, Raffaeli, Luigi Bernini, Aleksandr Ivanovi, Alek Rapoporti töid

  5. "Andke vene kunstnikele vaid toetuspunkt..." : intervjuu Moskva Riikliku Kaasaegse Kunsti Keskuse teaduri Irina Gorlovaga / Irina Gorlova ; interv. Reet Varblane

    Index Scriptorium Estoniae

    Gorlova, Irina

    2002-01-01

    Irina Gorlova ja Leonid Bazhanovi kureeritud vene kunstnike Dmitri Gutovi, Sergei Shutovi ja Vadim Zahharovi näitusest "Ristumised" Hansapanga galeriis. I. Gorlova suhtumisest 1960ndate avangardistide põlvkonda, Ülo Soosterist, Ilja Kabakovist, sürrealismist ja praegusest vene kunstist, Oleg Kulikust, Aleksandr Brenerist, Aleksandr Ponomarjovist

  6. Aleksandro-Nevski sobor / Juri Nikiforov

    Index Scriptorium Estoniae

    Nikiforov, Juri

    2002-01-01

    Tallinna Aleksander Nevski peakiriku ehituslugu: arhitekt Mihhail Preobrazhenski. Mosaiikpannoode looja on akadeemik A. Frolov, ikonostaasid (puit) teostas Pjotr Abrosimov (?), ikoonimaalid - akadeemik Aleksandr Novoskoltsev ja tema töökoda, vitraažid - Emil Schteinke (?), maalid - Mihhail Vassiljev ja Aleksandr Blazov, seinamaalingud - Grigori Prokofjev. 2002. a. lisandusid kaks Andrei Lobanovi vitraaži

  7. Russian-Belarusian propaganda war and Vilnius / Rokas M. Tracevskis

    Index Scriptorium Estoniae

    Tracevskis, Rokas M.

    2010-01-01

    Venemaa-Valgevene konfliktist, mille käigus tsenseeritakse meediat ning kritiseeritakse president Aleksandr Lukašenkot ja peaminister Vladimir Putinit, põhjuseks on maagaasi hind. 27. juulil toimunud Leedu peaministri Andrius Kubiliuse ja Valgevene peaministri Sergei Sidorski kohtumisel räägiti vedeldatud gaasi terminali projektist. 26. juunil toimunud Andrius Kubiliuse ja Aleksandr Lukašenko kohtumisest

  8. STRUCTURE AND THEMES IN THE NOVEL OF NAWAL EL SAADAWİ'S İMRA'E 'INDE NUKTATİ'S-SIFR (WOMAN AT POINT ZERO)

    OpenAIRE

    KÖŞELİ, Yusuf

    2015-01-01

    In almost all her works, dealing with gender discrimination, violence and abuse against women and the current social position of women, Nawal El Saadawi, one of the most important writers of Egypt and the Arab world as well as being, yet in her childhood, due to observing frequently the discrimination between girls and boys both in her family and in her immediate vicinity, come to the fore as a key activist since the twenties, advocating the rights of Arab women and the male-female equality i...

  9. Effects of glyceryl trinitrate and calcitonin-gene-related peptide on BOLD signal and arterial diameter –methodological studies by fMRI and MRA

    DEFF Research Database (Denmark)

    Asghar, Mohammed Sohail; Ashina, Messoud

    2013-01-01

    Over the last decades MRI has proved to be very useful in the field of drug development and discovery. Pharmacological MRI (phMRI) explores the interaction between brain physiology, neuronal activity and drugs[1]. The BOLD-signal is an indirect method to investigate brain activity by way...... of measuring task-related hemodynamic changes. Pharmacological substances that induce hemodynamic changes can therefore potentially alter the BOLD-signal that in turn falsely can be interpreted as changes in neuronal activity. It is therefore important to characterize possible effects of a pharmacological...... substance on the BOLD-response per see before that substance can be used in an fMRI experiment. Furthermore MR-angiography is useful in determining the vascular site-of-action of vasoactive substances....

  10. MR angiography of cerebral aneurysms

    International Nuclear Information System (INIS)

    Miki, Hitoshi; Tanada, Shuji; Sakaki, Saburo; Hamamoto, Ken; Sadamoto, Kazuhiko.

    1992-01-01

    Time-of-flight (TOF) MR angiography (MRA) and phase-contrast (PC) MRA are examined clinically for evaluating cerebral aneurysms. In the morphological diagnosis of cerebral aneurysms, three-dimensional (3D) MRA is superior to two-dimensional (2D) MRA because 3D MRA has a higher S/N ratio and a higher spatial resolution. However, it is difficult to decide which, 3D TOF MRA or 3D PC MRA, is superior, for both methods have many scan parameters. In our study, 3D PC MRA was performed using two methods; one had the same acquisition time as 3D TOF MRA, while the other had the same spatial resolution as 3D TOF MRA. The detectability of aneurysms by each MRA method was evaluated in comparison with 3D TOF MRA. In fifteen patients (6 males and 9 females), a total of 16 cerebral aneurysms (3 ruptured and 13 unruptured) were studied. The lesion sizes ranged from 2.5 to 18 mm. All the 16 lesions were examined by means of 3D TOF MRA, 3D PC MRA, and conventional angiography. MR imaging was performed with a 1.5 tesla MRI system (Signa). All of the 16 cerebral aneurysms were detected by 3D TOF MRA, while only 11 of them were detected by 3D PC MRA. When 3D PC MRA was performed with the same acquisition time as 3D TOF MRA, 3D PC MRA was superior in showing one of the 7 aneurysms. When 3D PC MRA was performed with same spatial resolution as 3D TOF MRA, 3D PC MRA was superior in showing two of the 10 aneurysms. 3D TOF MRA was superior to 3D PC MRA in the detection of cerebral aneurysms because of the long acquisition times and the different flow velocity, which induced different signal intensities between the aneurysms and parent arteries in 3D PC MRA. 3D PC MRA was superior to 3D TOF MRA in patients with large thrombotic aneurysms of the internal carotid artery. We consider that 3D TOF MRA should be the first choice for screening and following-up cerebral aneurysms. 3D PC MRA should then be performed for large cerebral aneurysms in addition to 3D TOF MRA. (author)

  11. Mira Sorvino : võpusknitsa Garvarda v blokadnom Leningrade / Liza Zolotõhh

    Index Scriptorium Estoniae

    Zolotõhh, Liza

    2007-01-01

    4-osaline telefilm Leningradi blokaadist "Leningrad" : stsenarist ja režissöör Aleksandr Buravski : Venemaa (PBK) - Suurbritannia, 2006. Osatäitjate valikust, filmivõtetest, 1. osa esilinastusest blokaadis osalenutele

  12. Duell diktaatoriga / Juri Hashtshevatski ; interv. Kelly Grossthal, Maari Ross

    Index Scriptorium Estoniae

    Hashtshevatski, Juri

    2007-01-01

    Tallinnas linastub esimene Eesti-Valgevene ühistöö "Kalinovski väljak", dokumentaalfilm Valgevene kuulsaima režissööri pikalt kestnud ja ohtlikust konfliktist diktaator Lukashenkaga. Poliitilisest olukorrast Valgevenes, president Aleksandr Lukashenkast

  13. Igrõ s istorijei v tsvetnom formate / Boris Tuch

    Index Scriptorium Estoniae

    Tuch, Boris, 1946-

    2008-01-01

    Mängufilm Aleksander Nevskist "Aleksander. Neeva lahing" ("Aleksandr. Nevskaja bitva") : stsenarist Vladimir Vardunas : režissöörid Igor Kalenov, Rustam Ibragimbekov : Venemaa 2008. Võrreldud ka Sergei Eisensteini mängufilmiga "Aleksander Nevski" (1938)

  14. Valgevenest Iraanini : Venezuela liider koob USA-vastas ühisrinnet / Krister Paris

    Index Scriptorium Estoniae

    Paris, Krister, 1977-

    2006-01-01

    Venezuela president Hugo Chavez külastab mitmeid Ameerika Ühendriikidele probleemseid riike. Kohtumine Valgevene presidendi Aleksandr Lukashenkoga, eelseisvast visiidist Venemaale. Lisa: Chavez tahab julgeolekunõukogusse

  15. Estoniju reklamirujut uzhe dva brenda / Andrei Babin

    Index Scriptorium Estoniae

    Babin, Andrei

    2007-01-01

    Eestit tutvustava logo "Welcome to Estonia" kõrval on kasutusel alternatiivne bränd "Balti võti" (Baltic Key). Projekti arendab eraettevõtja Aleksandr Neson. Kaubamärgi visuaalsest lahendusest. Autor on disainer Arturas Kiselius

  16. Telefilm toob venelasteni Solzhenitsõni Gulagi-romaani / Andres Laasik

    Index Scriptorium Estoniae

    Laasik, Andres, 1960-2016

    2006-01-01

    Vene telekanal hakkab näitama Gleb Panfilovi uut teleseriaali Aleksandr Solzhenitsõni "Esimeses ringis" järgi, kus kirjanik on stsenaariumi autor ja loeb ka kaadritagust jutustavat teksti. Peaosas Jevgeni Mironov

  17. Solzhenitsõni teekond Putini Venemaale / Udo Uibo

    Index Scriptorium Estoniae

    Uibo, Udo, 1956-

    2007-01-01

    Ajalehes The Times Litterary Supplement ilmunud Zinovi Ziniku artiklist Aleksandr Solzhenitsõni loomingust, mis ilmus aasta tagasi kogumikus The Solzhenitsyn Reader. New and essential writings 1947-2005

  18. Depth, chemical, and temperature from bottle casts in the Sea of Okhotsk from 29 June 1990 to 31 August 1997 (NODC Accession 0000385)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Depth, chemical, and temperature data were collected from the SAMOED, AKADEMIK ALEKSANDR NESMEYANOV, AKADEMIK M.A. LAVRENTYEV, and PROFESSOR LEVANIDOV from June 29,...

  19. Toetame Valgevenet / Kalev Kallemets

    Index Scriptorium Estoniae

    Kallemets, Kalev, 1979-

    2006-01-01

    Autor arvab, et demokraatia võiduletulekule Valgevenes aitaks kaasa Aleksandr Lukashenko mitte tunnustamine Valgevene presidendina, samuti tuleks toetada moraalselt ja aineliselt Valgevene opositsiooni. Valgevene majanduslik ning poliitiline toetamine Venemaa poolt tuleks muuta võimalikult ebemugavaks

  20. Politics and history: Lithuania and the Slavs / Rokas M. Tracevskis

    Index Scriptorium Estoniae

    Tracevskis, Rokas M.

    2011-01-01

    Poliitilised ja ajaloolised suhted Leedu ja slaavlastest naaberrahvaste vahel. 15. novembril Delfi.lt-le antud intervjuus on vene filosoof Aleksandr Dugin öelnud, et Venemaa võib Baltimaid uuesti okupeerida. Kaart

  1. Eesti dokumentaalfilm võitis USAs auhinna

    Index Scriptorium Estoniae

    2003-01-01

    Renita ja Hannes Lintropi dokumentaalfilm "Läbi pimeduse" Sompa kaevanduse kaevurist Aleksandr Gomanist sai Texases toimunud 36th Annual WorldFest-Huston filmifestivalil dokumentaalfilmide võistlussarjas Silver Remi auhinna

  2. Ajaloo traageldustega vene blockbuster'id / Jüri Laulik

    Index Scriptorium Estoniae

    Laulik, Jüri, 1959-

    2008-01-01

    Vene ajalugu mängufilmides: "Admiral" (rezh. Andrei Kravtshuk : Venemaa 2008), "Aleksandr. Nevskaja bitva" (rezh. Igor Kalenov : Venemaa 2008), "1612" (rezh. Vladimir Hotinenko : Venemaa 2007), "Mongol" (rezh. Sergei Bodrov : Venemaa - Saksamaa - Kasahstan - Mongoolia 2007)

  3. Narvitjanin Andrei Ivanen napisal knigu o dramatitsheskoi sudbe tserkvi Stieglitza / Irina Tokareva

    Index Scriptorium Estoniae

    Tokareva, Irina

    2004-01-01

    Sankt-Peterburi kirjastuse "Kollo" väljaantud raamatu "Ivangorodskaja-Svjato-Troitskaja tserkov barona Aleksandra Stieglitza" saamisloost, kirikust (arhitekt Aleksandr Krakau, altarimaal Fjodor Bruni) ja selle taastamisest. Raamatu fotod: Leonid Lashkevitsh

  4. Narvitjanin Andrei Ivanen napisal knigu o dramatitsheskoi sudbe tserkvi Shtiglitsa / Irina Tokareva

    Index Scriptorium Estoniae

    Tokareva, Irina

    2004-01-01

    Narva koduloolane Andrei Ivanen raamatu "Ivangorodskaja-Svjato-Troitskaja tserkov barona Aleksandra Stiglitsa" saamisloost. Arhitekt Aleksandr Krakau kavandatud Ivangorodi Püha Kolmainsuse kiriku hoonest ja selle taastamisest. Kiriku altarimaal on Fjodor Brunilt. Raamatu fotod Leonid Lashkevitshilt

  5. Osvjashtshenõ kolokola Hrama na granitse / Anna Orshanskaja

    Index Scriptorium Estoniae

    Orshanskaja, Anna

    2006-01-01

    Vene riigitegelasest ja töösturist parun Aleksandr Stieglitzist. Mälestustseremoonial pühitseti perekond Stieglitz'ite matmispaiga Ivangorodi Püha Kolmainsuse kiriku uued tornikellad. Kirikuhoonest ja selle rekonstrueerimisest

  6. Leto v Russkom teatre

    Index Scriptorium Estoniae

    2007-01-01

    Augustis Vene Teatri alternatiivsel laval "Garaaž" : 9. augustil "Veerevad kivid ei sammaldu", lavastaja Nikita Grinshpun (Moskva) ja 7., 8. augustil Aleksandr Potuzhnõi lavastus "Jõgi asfaldil", autor Dmitri Lipskerov

  7. Kas keegi on kodus? : oma varju jälil / Zinovi Zinik ; inglise keelest tõlkinud Märt Väljataga

    Index Scriptorium Estoniae

    Zinik, Zinovi

    2007-01-01

    Ettekanne Euroopa kultuuriajakirjade 20. kohtumisel Sibius 2007. aastal. Eksiilkirjanikest ja kuuluvustundest. Käsitletakse Aleksandr Asarkarinit, Jevgeni Shvartsi, Albert von Chamissot, Hannah Arendti ja Joseph Conradit ning nende loomingut. Orig.: Anyone at home? In pursuit of one's own shadow.

  8. Po sledam Jantarnoi komnatõ / Jelena Nikiforova

    Index Scriptorium Estoniae

    Nikiforova, Jelena

    2000-01-01

    Peeter I-le kingitud (1716) merevaigutoast, mis 1755-1757 V. Rastrelli juhtimisel paigutati Tsarskoje Selo (Pushkin) Jekaterina lossi. Merevaigutoa saamislugu, selle saatusest ja taastamisplaanidest (projekti autor arh. Aleksandr Kedrinski)

  9. Vene Kultuurikeskus = The Russian Culture Centre / Margit Mutso

    Index Scriptorium Estoniae

    Mutso, Margit, 1966-

    2010-01-01

    Tallinnas Mere puiestee 5 asuva hoone (arhitekt A. Kuznetsov, 1954) restaureerimisest. Arhitekt Niina Mäger, sisearhitekt Anne Tamverk. Ajaloolane Aleksandr Pantelejev. Žürii liikme Mait Summataveti hinnang kultuurkapitali aastapreemiale esitatud hoonele

  10. Zhenihh Balzaminov, skrõvajas ot svahh, zanimalsja jogoi / Oleg Peranov

    Index Scriptorium Estoniae

    Peranov, Oleg

    2004-01-01

    Mängufilm Aleksandr Ostrovski teoste alusel "Balsaminovi abiellumine" ("Zhenitba Balzaminova") : stsenarist ja režissöör Konstantin Voinov : Nõukogude Liit 1964. Osavõtjate mälestusi filmi võtetelt

  11. Manifestically correct / Harry Liivrand

    Index Scriptorium Estoniae

    Liivrand, Harry, 1961-

    2000-01-01

    Euroopa kaasaegse kunsti biennaal Manifesta 3 Ljubljanas deviisi all "Piirijoone sündroom. Kaitsmise energiad". Eestit esindab Ene-Liis Semper videoinstallatsiooniga "FF / Rew". Aleksandr Breneri aktsioonist. Bosnia-Hersegoviina kunstniku Sejla Kamerici tööst jm

  12. On vaid üks võimalik liikumissuund - ülespoole / Boris Tuch

    Index Scriptorium Estoniae

    Tuch, Boris, 1946-

    2007-01-01

    Vene Teatri etendustest - W. Shakespeare'i "Kuidas teile meeldib", lavastaja Timofei Sopolev; Brian Frieli "Lõikuspeo tantsud", lavastaja Mihhail Feigin; Aleksandr Ostrovski "Tulus amet", lavastaja Mihhail Tshumatshenko; Anton Tshehhovi jutustuse järgi "Palat nr 6", lavastaja Aljona Aljohhina

  13. Прошло награждение премией "Хрустальная Турандот"

    Index Scriptorium Estoniae

    2009-01-01

    Moskvas toimus teatripreemia "Kristalne Turandot" laureaatide tasustamise XVIII tseremoonia. Preemiad said : kauaaegse teatritegevuse eest Aleksandr Širvindt, parima naisostäitmise eest Tšulpan Hamatova ja parima meesosatäitmise eest Jevgeni Mironov

  14. MPs question reports of citizenship bribery / Ksenia Repson

    Index Scriptorium Estoniae

    Repson, Ksenia

    2005-01-01

    Reformierakonna väitel on alusetu seostada rahvastikuminister Paul-Erik Rummo ettepanekut anda teenete eest kodakondsus ärimeestele Sergei Sergejenkovile ja Aleksandr Frolovile ning viimaste soovi ühineda Reformierakonnaga. Mitte-eestlaste osakaal Reformierakonnas

  15. Sasha, ja gorda, tshto ja tvoi utshitel! / Boris Tuch

    Index Scriptorium Estoniae

    Tuch, Boris, 1946-

    2001-01-01

    18. mail toimub Vene Draamateatris rahvusvahelist stepipäeva tähistav kontsert. Korraldajaks on Duff-tap studio, mida juhendab Aleksandr Ivashkevitsh. Kontserdil osalevad Barbara Duffy (USA) ja Vladimir Kirsanov (Venemaa)

  16. Ilmamere lainetel / Margus Haav

    Index Scriptorium Estoniae

    Haav, Margus, 1969-

    2009-01-01

    Režissöör Goro Miyazaki poolt ulmekirjanik Ursula K. Le Guini "Meremaa lugude" põhjal tehtud joonisfilmist "Ilmamere lood" (Studio Ghibili, Jaapan, 2006). Samas pealkirja all "Tappev humaansus" Aleksandr Melniku filmist "Uus maa" (Venemaa, 2008)

  17. Bagatellid : maailm / Nele-Eva Steinfeld

    Index Scriptorium Estoniae

    Steinfeld, Nele-Eva

    2008-01-01

    Suri pianist Aleksandr Slobodjanik. Opera News jagas preemiaid. Ajulained kohtuvad helilainetega. Luciano Pavarotti mälestus. Stradivari tšello oksjonil. Õuduslugu "Kärbes" uues ooperikuues. Anna Netrebko tagasitulek

  18. Mihhail Zharov ustroil amerikantsam "Vesjoluju voinu" / Oleg Peranov

    Index Scriptorium Estoniae

    Peranov, Oleg

    2006-01-01

    Muusikaline komöödia "Rahutu majapidamine" ("Bespokoinoje hozjaistvo") : režissöör Mihhail Zharov : osades Ljudmila Tselikovskaja, Aleksandr Grave, Sergei Filippov, Mihhail Zharov : Mosfilm 1946. Tegijad meenutavad filmivõtteid

  19. Фотограф из Эстонии назван лучшим / Лилия Крысина

    Index Scriptorium Estoniae

    Крысина, Лилия

    2010-01-01

    Tallinnas sündinud, 2006. aastast Venemaal elav fotograaf Aleksandr Gronski võitis Amsterdami fotomuuseumi Foam korraldatud rahvusvahelise fotokonkursi Foam Paul Huff Award 2010 ja sai võimaluse oma töid eksponeerida Amsterdami fotomuuseumis. Fotograafist

  20. Pöffihunt ulub juba 15. korda / Kaarel Kressa

    Index Scriptorium Estoniae

    Kressa, Kaarel, 1983-

    2011-01-01

    15. Pimedate Ööde Filmifestivali tutvustus. Põhiprogrammist, filmiturust, animafilmide festivalist Animated Dreams, laste- ja noortefilmide festivalist Just Film. Elutööpreemia saavad Rein Raamat, Rein Maran, Aleksandr Sokurov ja Fridrik Thor Fridriksson

  1. Noored ootavad revolutsiooni / Silver Meikar

    Index Scriptorium Estoniae

    Meikar, Silver, 1978-

    2006-01-01

    Valgevenes on noored tulnud tänavale, et protestida presidendivalimiste tulemuste vastu. Vt. samas: Venemaa võimud toetavad avalikult Valgevene presidenti Aleksandr Lukashenkat; Lukashenka ülisuur võit

  2. Сказка - ложь, да в ней намек... / Виктор Кузнецов

    Index Scriptorium Estoniae

    Кузнецов, Виктор

    2003-01-01

    Nõukogude lastekirjandusest 1930. a-te 2. poolel: Lagin, Lazar. Vanake Hottabõtsh (1938); Volkov, Aleksandr. Smaragdlinna võlur (1939); Tolstoi, Aleksei. Kuldvõtmeke ehk Buratino seiklused (1936); Tshukovski, Kornei. Varastatud päike (1935)

  3. Kak sdelat iz slona voronu / Margarita Golovanova

    Index Scriptorium Estoniae

    Golovanova, Margarita

    2006-01-01

    25 aastat tagasi valmis NSV Liidus esimene plastiliinist nukkudega animafilm "Plastiliinist vares" ("Plastilinovaja vorona") : režissöör Aleksandr Tatarski : kunstnik-lavastaja Igor Kovaljov : helilooja Grigori Gladkov

  4. Odna prostaja plastilinovaja skazka pro voronu / Nadezhda Guzheva

    Index Scriptorium Estoniae

    Guzheva, Nadezhda

    2007-01-01

    Kirjanik Eduard Uspenski meenutab, kuidas 26 aastat tagasi valmis NSV Liidus esimene plastiliinist nukkudega animafilm "Plastiliinist vares" ("Plastilinovaja vorona"), mille värsid tema kirjutas : režissöör Aleksandr Tatarski : helilooja Grigori Gladkov

  5. Kapo vahistas pistise pakkumise kahtlusega Narva linnavoliniku / Tanel Mazur

    Index Scriptorium Estoniae

    Mazur, Tanel, 1971-

    2008-01-01

    Ilmunud ka: Narva Postiljon 30. aug. lk. 1. Kaitsepolitsei pidas 28.augustil altkäemaksu andmises kahtlustatavana kinni Narva linnavolikogu liikme, keskerakondlase Aleksandr Moissejevi. Vahistamise asjaolusid kaitsepolitsei ei kommenteeri. Lisa: Äripartner hämmastunud

  6. Pust budet bezoblatshnõm nebo nad Baltiiskim domom / Ella Agranovskaja

    Index Scriptorium Estoniae

    Agranovskaja, Ella, 1950-

    2000-01-01

    Teatrifestivali "Baltiiski dom" nimelise medali "Stroitel Baltiiskogo doma" pälvisid teatrikriitik Eteri Kekelidze, lavastaja Elmo Nüganen, endine kultuuriminister Jaak Allik, Vene Draamateatri direktor Aleksandr Iljin, teatrijuht Jaak Viller ja Kultuuriministeeriumi kantsler Margus Allikmaa

  7. Za gospostavkami u nas glaz da glaz nuzhen / Margarita Kornõsheva

    Index Scriptorium Estoniae

    Kornõsheva, Margarita, 1957-

    2008-01-01

    Riigihangete ameti järelevalvetalituse juhataja Aleksandr Bakirov riigihangete järelevalvest, talituse tööst. Diagrammid: Postavshtshiki, proverennõje v 2007 godu; Narushenija zakona postavshtshikami

  8. "Budjem nazhimat" / Allan Martinson ; interv. Petr Birger

    Index Scriptorium Estoniae

    Martinson, Allan, 1966-

    2006-01-01

    Allan Martinson oma asutatud infotehnoloogia ettevõtetest Eestis ja Baltimaades, investeerimisfirma Martinson Trigon Venture Partners investeeringust Vene tarkvarafirmasse Reksoft ning Eesti IT arengust tervikuna. Vt. samas intervjuud Reksoft'i peadirektori Aleksandr Jegoroviga

  9. Театральная радуга в городе белых ночей / Борис Тух

    Index Scriptorium Estoniae

    Тух, Борис, 1946-

    2015-01-01

    16. teatrifestival Vikerkaar toimus Peterburis mais-juunis 2015, korraldas Aleksandr Brjantsevi nimeline Noorsooteater. Pikemalt Brjantsevi nim. Noorsooteatri lavastusest Ray Bradbury romaani "Võilillevein" ainetel (lavastaja Adolf Šapiro)

  10. Viktor Rõzhakov : teatr - eto bezdonnoje prostrantstvo / Viktor Rõzhakov ; interv. Boris Tuch

    Index Scriptorium Estoniae

    Rõžakov, Viktor

    2006-01-01

    Vene Teatri väikeses saalis esietendus Aleksandr Volodini näidend "Kallimast ei lahkuta", mille lavastas teistkordselt V. Rõzhakov. Eesti Draamateatris on plaanis lavastada Ivan Võrõpajevi "Valentinipäev"

  11. От Екатерингофа до Екатеринталя / Г. Прошин

    Index Scriptorium Estoniae

    Прошин, Г.

    2006-01-01

    Sakslased Venemaal. Sakslastest tegelaskujud vene kirjanduses: Deniss Fonvizini "Äbarikus", Aleksandr Puškini "Padaemandas", Nikolai Gogoli "Nevski prospektis", Ivan Turgenevi "Aadlipesas", Ivan Gontšarovi "Oblomovis", Nikolai Leskovi "Raudses tahtes" ning Fjodor Dostojevski teostes

  12. Vino Dionisiiskihh prazdnestv / Jelena Skulskaja

    Index Scriptorium Estoniae

    Skulskaja, Jelena, 1950-

    2001-01-01

    Rahvusvahelise teatripäeva tähistamine Vene Draamateatris, küsimustele vastavad näitlejad Lembit Ulfsak, Aleksandr Ivashkevitsh, Julia Popova, lavastajad Eduard Toman ja Svetlana Krassman ning Venemaa saadik Eestis Konstantin Provalov

  13. Venelased alati esimesed / Jaan Ruus

    Index Scriptorium Estoniae

    Ruus, Jaan, 1938-2017

    2006-01-01

    Libadokumentaalfilm (mockumentary) "Esimese inimesena Kuul" ("Pervõje na Lune") : stsenaristid Aleksandr Gonorovski, Ramil Jamalejev : režissöör Aleksei Fedortshenko : Venemaa 2004. Lisatud selgitus termini "mockumentary" kohta

  14. Из Таллинна в Париж / Антон Бакунцев

    Index Scriptorium Estoniae

    Бакунцев, Антон, 1973-

    2013-01-01

    Kahe 1930ndatel Tallinnast Pariisi saadetud kirja publikatsioonid: Pavel Irteli (1896-1979) kiri Pavel Miljukovile (dateeritud 21.03.1932) ja Aleksandr Šultsi (1884-?) kiri Leonid Zurovile (dateeritud 28.11.1935)

  15. DVD. Aare Ermel tutvustab / Aare Ermel

    Index Scriptorium Estoniae

    Ermel, Aare, 1957-2013

    2007-01-01

    Eluloofilm "Lermontov" : režissöör Nikolai Burljajev : NSV Liit 1986 ja teleseriaal "Petshorin: meie aja kangelane" ("Petshorin: geroi nashego vremeni") : režissöör Aleksandr Kott : nimiosas Igor Petrenko : Venemaa 2006

  16. Kalamaja põhikooli rekonstrueerimine = Renovation of Kalamaja basic school / Margit Mutso

    Index Scriptorium Estoniae

    Mutso, Margit, 1966-

    2009-01-01

    Tallinnas Vabriku 18 asuva Kalamaja põhikooli hoone (arhitekt Georg Hellat, 1915) muinsuskaitse eritingimused koostas Aleksandr Pantelejev, arhitekt on Andres Põime, sisearhitekt Reet Põime (Studio 3). Žürii hinnang kultuurkapitali aastapreemiale esitatud hoonele

  17. Lennujaamast ja parunist puu otsas : [lugemiselamustest] / Ülar Ploom

    Index Scriptorium Estoniae

    Ploom, Ülar

    2007-01-01

    Maailmaklassikast: Mark Twaini "Huckelberry Finni seiklused", Jules Verne'i "Saladuslik saar", Gabriel García Márquezi "Sada aastat üksildust", Aleksandr Erteli "Gardeninid", Italo Calvino "Parun puu otsas"

  18. Obraz Stalina v tvortshestve A. Solzhenitsõna, V. Maksimova, J. Druzhnikova / Lucjan Suchanek ; poola keelest tõlkinud autor

    Index Scriptorium Estoniae

    Suchanek, Lucjan

    2002-01-01

    Bibl. märkustes, lk. 138. Stalin tegelaskujuna Aleksandr Solzhenitsõni "Esimeses ringis" ning Vladimir Maksimovi ("Kovtsheg dlja nezvanõh") ja Juri Druzhnikovi ("Angelõ na kontshike iglõ") teostes

  19. Puti povõshenija effektivnosti proizvodstva / Ain Alvela

    Index Scriptorium Estoniae

    Alvela, Ain, 1967-

    2008-01-01

    Kulude kokkuhoid aitab saavutada kõrgemat tootlikkust. Vt. samas: Indeks rosta proizvoditelnosti za period 2000-2007gg., %. Kommenteerivad: Aleksandr Miina, Ants Pak, Kaul Aulasmägi, Veljo Haube ja Kuido Kuntro

  20. Узнавание : [kiri] / Владимир Крячко

    Index Scriptorium Estoniae

    Крячко, Владимир

    2011-01-01

    27. nov. 2010 dateeritud kiri sisaldab kommentaare autori samas ajakirjanumbris avaldatud luulevalimikule (vt. lk. 151-160) ning kirjeldab Volžski linnaraamatukogus toimunud Aleksandr Meni ja kirjanik Boriss Krjatško mälestusüritusi

  1. Ot Gannibala do "Russkogo bunta" / Tatjana Mühlbeier

    Index Scriptorium Estoniae

    Mühlbeier, Tatjana

    2000-01-01

    Eestis elanud legendaarsest A. Pushkini vaarisast Abram Hannibalist ja temaga seoses ka sama ajastut kujutavast vene režissööri Aleksandr Proshkini uuest ajaloolisest mängufilmist "Vene mäss" ("Russki bunt")

  2. Is Soviet Defense Policy Becoming Civilianized?

    Science.gov (United States)

    1990-08-01

    Larionov, a consultant to the institute, both at RAND and in Moscow; and Drs. Alexei Arbatov and Aleksandr Savelyev and several of their colleagues during...Soviet defense industry resources to civilian use is presented in Arthur J. Alexander , Perestroika and Change in Soviet Weapons Acquisition, The RAND...1986, especially pp. 101-102. 17 18 the more prominent younger specialists like Alexei Arbatov, Andrei Kokoshin, and Aleksandr Savelyev have long been

  3. Value of high spatial and high temporal resolution magnetic resonance angiography for differentiation between idiopathic and thromboembolic pulmonary hypertension: initial results

    Energy Technology Data Exchange (ETDEWEB)

    Ley, Sebastian; Eichinger, Monika [DKFZ, Department of Radiology (E010), Heidelberg (Germany); Johannes Gutenberg-University, Department of Radiology, University Hospital Mainz, Mainz (Germany); Fink, Christian; Zaporozhan, Julia; Puderbach, Michael; Plathow, Christian; Kauczor, Hans-Ulrich [DKFZ, Department of Radiology (E010), Heidelberg (Germany); Borst, Mathias M.; Meyer, F. Joachim; Gruenig, Ekkehard [University Heidelberg, Department of Internal Medicine, Heidelberg (Germany); Kreitner, Karl-Friedrich [Johannes Gutenberg-University, Department of Radiology, University Hospital Mainz, Mainz (Germany)

    2005-11-01

    Differentiation between different forms of pulmonary hypertension (PH) is essential for correct disease management. The goal of this study was to elucidate the clinical impact of high spatial resolution MR angiography (SR-MRA) and time-resolved MRA (TR-MRA) to differentiate between patients with chronic thromboembolic PH (CTEPH) and idiopathic pulmonary arterial hypertension (IPAH). Ten PH patients and five volunteers were examined. Twenty TR-MRA data sets (TA 1.5 s) and SR-MRA (TA 23 s) were acquired. TR-MRA data sets were subtracted as angiography and perfusion images. Evaluation comprised analysis of vascular pathologies on a segmental basis, detection of perfusion defects, and bronchial arteries by two readers in consensus. Technical evaluation comprised evaluation of image quality, signal-to-noise ratio (SNR) measurements, and contrast-media passage time. Visualization of the pulmonary arteries was possible down to a subsegmental (SR-MRA) and to a segmental (TR-MRA) level. SR-MRA outperformed TR-MRA in direct visualization of intravascular changes. Patients with IPAH predominantly showed tortuous pulmonary arteries while in CTEPH wall irregularities and abnormal proximal-to-distal tapering was found. Perfusion images showed a diffuse pattern in IPAH and focal defects in CTEPH. TR-MRA and SR-MRA resulted in the same final diagnosis. Both MRA techniques allowed for differentiation between IPAH and CTEPH. Therefore, TR-MRA can be used in the clinical setting, especially in dyspneic patients. (orig.)

  4. The role of MR angiography before transjugular placement of a portosystemic stent shunt (TIPS)

    International Nuclear Information System (INIS)

    Mueller, M.F.; Siewert, B.; Kim, D.; Edelman, R.R.; Stokes, K.R.; Finn, J.P.

    1994-01-01

    The authors employed magnetic resonance angiography (MRA) to guide catheter placement for transjugular intrahepatic portosystemic stent shunt (TIPS) procedures in 14 of 24 patients, and compared the results to the 10 patients who did not have prior panning based on MRA. Two-dimensional time-of-flight venography was performed during breath holding, and projection venograms were formatted in sagittal, coronal and axial planes. MRA defined venous anatomy sufficiently well to shorten the procedure and helped to minimize invasiveness. With MRA guidance, intrahepatic needle punctures were significantly fewer (without MRA guidance: mean 12.1; with MRA guidance: mean 3.5, p [de

  5. By-law no 36/MRA/SG/ANEA from 29 july 2004 on the role, organisation and functioning of l'Autorite Nationale de l'Energie Atomique

    International Nuclear Information System (INIS)

    2004-01-01

    The text called Arrete approaches in its general provisions the organization, attributions of the various parts (secretariat and various services) and their operation. The provisions emphasize the institutional anchoring of the Authority as well as the details of implementation of its mechanisms of operation [fr

  6. Evaluation of Contrast MR Angiography in the Study of Internal Carotid Artery Stenosis. Systematic Review of the Literature; Evaluacion de la estenosis de la arteria carotida interna por angiografia REM con contraste: revision sistematica de la bibliografia

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Perez, P.; Martinez Cantarero, J. [Hospital Universitario 12 de Octubre. Madrid (Spain); Ruiz Diaz, M.; Blazquez Morera, J. A. [Universidad Autonoma de Madrid (Spain); Llano Senaris, J. E. de [Fundacion Gaspar Casal. Madrid (Spain)

    2004-07-01

    To evaluate the diagnostic benefit of using contrast MR Angiography (MRA) in the study of extracranial internal carotid artery stenosis as opposed to intraarterial digital subtraction arteriography (LADSA). A search for relevant articles from 1990 to 2000 using MDLINE and EMBASE databases. Initial selection criteria: 1. articles which compare MRA and IADSA in the study of extracranial internal carotid artery stenosis; and 2, sample size of 10 or more subjects. Studies employing contrast MRA were subsequently selected. Contrast MRA diagnostic results were studied, as were those of non-contrast MRA (TOF) if included. Roc curves and 95% confidence intervals were calculated. In the studies, 324 patients and 648 extracranial internal carotid arteries were evaluated (12 articles). The diagnostic results in carotid artery stenosis discrimination using contrast MRA as opposed to IADSA were sensitivity and specificity=97.28% and 96.08%. With regard to contrast MRA vs. non-contrast MRA (TOF), significant differences favoring contrast MRA in both sensitivity and specificity were observed. (p=0.08 and p<0.001, respectively). MRA techniques demonstrate very high diagnostic capabilities in the detection of carotid stenosis, with contrast MRA being more effective than non-contrast. MRA. In spite of not being superior to IADSA, given the morbimortality risk which the latter is associated (0.7-1.2%). many authors defend contrast MRA (in association with Doppler echography) having become the method of choice for presurgical study of extracranial internal carotid artery stenosis. (Author) 53 refs.

  7. Evaluation of Contrast MR Angiography in the Study of Internal Carotid Artery Stenosis. Systematic Review of the Literature

    International Nuclear Information System (INIS)

    Rodriguez Perez, P.; Martinez Cantarero, J.; Ruiz Diaz, M.; Blazquez Morera, J. A.; Llano Senaris, J. E. de

    2004-01-01

    To evaluate the diagnostic benefit of using contrast MR Angiography (MRA) in the study of extracranial internal carotid artery stenosis as opposed to intraarterial digital subtraction arteriography (LADSA). A search for relevant articles from 1990 to 2000 using MDLINE and EMBASE databases. Initial selection criteria: 1. articles which compare MRA and IADSA in the study of extracranial internal carotid artery stenosis; and 2, sample size of 10 or more subjects. Studies employing contrast MRA were subsequently selected. Contrast MRA diagnostic results were studied, as were those of non-contrast MRA (TOF) if included. Roc curves and 95% confidence intervals were calculated. In the studies, 324 patients and 648 extracranial internal carotid arteries were evaluated (12 articles). The diagnostic results in carotid artery stenosis discrimination using contrast MRA as opposed to IADSA were sensitivity and specificity=97.28% and 96.08%. With regard to contrast MRA vs. non-contrast MRA (TOF), significant differences favoring contrast MRA in both sensitivity and specificity were observed. (p=0.08 and p<0.001, respectively). MRA techniques demonstrate very high diagnostic capabilities in the detection of carotid stenosis, with contrast MRA being more effective than non-contrast. MRA. In spite of not being superior to IADSA, given the morbimortality risk which the latter is associated (0.7-1.2%). many authors defend contrast MRA (in association with Doppler echography) having become the method of choice for presurgical study of extracranial internal carotid artery stenosis. (Author) 53 refs

  8. Whole-body MR angiography with body coil acquisition at 3 T in patients with peripheral arterial disease using the contrast agent gadofosveset trisodium

    DEFF Research Database (Denmark)

    Nielsen, Yousef W; Eiberg, Jonas P; Løgager, Vibeke B

    2009-01-01

    Whole-body magnetic resonance angiography (WB-MRA) at 3 T with body coil acquisition has not previously been investigated. In this study, WB-MRA was performed in this manner using the blood pool contrast agent gadofosveset trisodium.......Whole-body magnetic resonance angiography (WB-MRA) at 3 T with body coil acquisition has not previously been investigated. In this study, WB-MRA was performed in this manner using the blood pool contrast agent gadofosveset trisodium....

  9. Fat-Suppressed Gadolinium-Enhanced Three-Dimensional Magnetic Resonance Angiography Adequately Depicts the Status of Iliac Arteries Following Atherectomy and Stent Placement

    International Nuclear Information System (INIS)

    Amano, Yasuo; Gemma, Kazuhito; Kawamata, Hiroshi; Kumazaki, Tatsuo

    1998-01-01

    Fat-suppressed, three-dimensional magnetic resonance angiography (3D MRA) was performed on nine patients with 11 iliac artery stenoses following atherectomy or stent placement. The MRA accurately depicted continued patency, restenosis, or aneurysm formation when compared with immediate posttreatment conventional arteriography. Therefore MRA is accurate and can be used independently for clinical decision making

  10. Diagnostic accuracy of contrast-enhanced MR angiography and unenhanced proton MR imaging compared with CT pulmonary angiography in chronic thromboembolic pulmonary hypertension

    Energy Technology Data Exchange (ETDEWEB)

    Rajaram, Smitha [Unit of Academic Radiology, University of Sheffield, Sheffield (United Kingdom); Academic Unit of Radiology, C Floor, Royal Hallamshire Hospital, Sheffield (United Kingdom); Swift, Andrew J.; Wild, Jim M. [Unit of Academic Radiology, University of Sheffield, Sheffield (United Kingdom); Sheffield Cardiovascular Biomedical Research Unit, Sheffield (United Kingdom); Capener, David; Telfer, Adam [Unit of Academic Radiology, University of Sheffield, Sheffield (United Kingdom); Davies, Christine; Hill, Catherine [Sheffield Teaching Hospitals Trust, Department of Radiology, Sheffield (United Kingdom); Condliffe, Robin; Elliot, Charles; Kiely, David G. [Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield (United Kingdom); Sheffield Cardiovascular Biomedical Research Unit, Sheffield (United Kingdom); Hurdman, Judith [Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield (United Kingdom)

    2012-02-15

    To evaluate the diagnostic accuracy of contrast-enhanced MR angiography (CE-MRA) and the added benefit of unenhanced proton MR angiography compared with CT pulmonary angiography (CTPA) in patients with chronic thromboembolic disease (CTE). A 2 year retrospective study of 53 patients with chronic thromboembolic pulmonary hypertension who underwent CTPA and MRI for suspected pulmonary hypertension and a control group of 36 patients with no CT evidence of pulmonary embolism. The MRI was evaluated for CTE and the combined diagnostic accuracy of ce-MRA and unenhanced proton MRA was determined. CE-MRA generated lung perfusion maps were also assessed. The overall sensitivity and specificity of CE-MRA in diagnosing proximal and distal CTE were 98% and 94%, respectively. The sensitivity improved from 50% to 88% for central vessel disease when CE-MRA images were analysed with unenhanced proton MRA. The CE-MRA identified more stenoses (29/18), post-stenosis dilatation (23/7) and occlusions (37/29) compared with CTPA. The CE-MRA perfusion images showed a sensitivity of 92% for diagnosing CTE. CE-MRA has high sensitivity and specificity for diagnosing CTE. The sensitivity of CE-MRA for visualisation of adherent central and lobar thrombus significantly improves with the addition of unenhanced proton MRA which delineates the vessel wall. (orig.)

  11. Diagnostic accuracy of contrast-enhanced MR angiography and unenhanced proton MR imaging compared with CT pulmonary angiography in chronic thromboembolic pulmonary hypertension

    International Nuclear Information System (INIS)

    Rajaram, Smitha; Swift, Andrew J.; Wild, Jim M.; Capener, David; Telfer, Adam; Davies, Christine; Hill, Catherine; Condliffe, Robin; Elliot, Charles; Kiely, David G.; Hurdman, Judith

    2012-01-01

    To evaluate the diagnostic accuracy of contrast-enhanced MR angiography (CE-MRA) and the added benefit of unenhanced proton MR angiography compared with CT pulmonary angiography (CTPA) in patients with chronic thromboembolic disease (CTE). A 2 year retrospective study of 53 patients with chronic thromboembolic pulmonary hypertension who underwent CTPA and MRI for suspected pulmonary hypertension and a control group of 36 patients with no CT evidence of pulmonary embolism. The MRI was evaluated for CTE and the combined diagnostic accuracy of ce-MRA and unenhanced proton MRA was determined. CE-MRA generated lung perfusion maps were also assessed. The overall sensitivity and specificity of CE-MRA in diagnosing proximal and distal CTE were 98% and 94%, respectively. The sensitivity improved from 50% to 88% for central vessel disease when CE-MRA images were analysed with unenhanced proton MRA. The CE-MRA identified more stenoses (29/18), post-stenosis dilatation (23/7) and occlusions (37/29) compared with CTPA. The CE-MRA perfusion images showed a sensitivity of 92% for diagnosing CTE. CE-MRA has high sensitivity and specificity for diagnosing CTE. The sensitivity of CE-MRA for visualisation of adherent central and lobar thrombus significantly improves with the addition of unenhanced proton MRA which delineates the vessel wall. (orig.)

  12. Endothelin-1 and endothelin-2 initiate and maintain contractile responses by different mechanisms in rat mesenteric and cerebral arteries

    DEFF Research Database (Denmark)

    Compeer, M. G.; Janssen, G. M. J.; De Mey, J. G. R.

    2013-01-01

    , but relaxed ET-1-induced contractions in MRA. A PLC inhibitor prevented contractile responses to ET-1 and ET-2 in MRA and BA, and relaxed ET-1- and ET-2-induced responses in MRA and ET-1 effects in BA. A Rho-kinase inhibitor did not modify sensitivity, maximum and maintenance of responses to both peptides...... in both arteries but relaxed ET-2, but not ET-1, effects in MRA and ET-1 effects in BA. Conclusions and ImplicationsPLC played a key role in arterial contractile responses to ETs, but ET-1 and ET-2 initiated and maintained vasoconstriction through different mechanisms, and these differed between MRA...

  13. Noncontrast-enhanced magnetic resonance renal angiography using a repetitive artery and venous labelling technique at 3 T: comparison with contrast-enhanced magnetic resonance angiography in subjects with normal renal function

    Energy Technology Data Exchange (ETDEWEB)

    Park, Sung Yoon [Sungkyunkwan University School of Medicine, Department of Radiology and Center for Imaging Science, Samsung Medical Center, Seoul (Korea, Republic of); Severance Hospital, Yonsei University College of Medicine, Department of Radiology and Research Institute of Radiological Science, Seoul (Korea, Republic of); Kim, Chan Kyo; Park, Byung Kwan [Sungkyunkwan University School of Medicine, Department of Radiology and Center for Imaging Science, Samsung Medical Center, Seoul (Korea, Republic of); Kim, EunJu [Philips Healthcare Korea, Seoul (Korea, Republic of)

    2014-09-13

    To investigate the feasibility of noncontrast-enhanced MR angiography (NC-MRA) using the repetitive artery and venous labelling (RAVEL) technique to evaluate renal arteries compared to contrast-enhanced MR angiography (CE-MRA). Twenty-five subjects with normal renal function underwent NC-MRA using a RAVEL technique and CE-MRA at 3 T. Two independent readers analysed the MRA images. Image quality, number of renal arteries, presence or absence of an early branching vessel, and diameter of the main renal arteries were evaluated. The overall image quality of NC-MRA was fair or greater in 88 % of right and 92 % of left renal arteries, while it was 96 % in both sides with CE-MRA. On NC-MRA, the number of renal arteries in all subjects was perfectly predicted by both readers. Sensitivity and specificity for predicting early branching vessels were 82 % and 100 % for reader 1 and 82 % and 95 % for reader 2. Inter-modality agreement for comparing the diameters of main renal arteries was good or excellent at all segments for both readers. Inter-reader agreement was moderate or good at all segments except at the right distal segment on NC-MRA. NC-MRA with the RAVEL technique at 3 T may have comparable diagnostic feasibility for evaluating renal arteries compared to CE-MRA. (orig.)

  14. Accuracy of 3 T MR angiography in vertebral artery stenosis and coincidence with other cerebrovascular stenoses

    International Nuclear Information System (INIS)

    Choi, Hyun Seok; Kim, Dong Ik; Kim, Dong Joon; Kim, Jinna; Kim, Eun Soo; Lee, Seung-Koo

    2010-01-01

    Ostium of vertebral artery (VA) is a common site of pseudostenosis on contrast-enhanced MR angiography (CE-MRA). The purpose of this study was to determine the diagnostic accuracy of CE-MRA at 3 T in the evaluation of ostial stenosis of VA and to find associated coincidental stenoses using logistic regression analysis. One hundred and thirty-five VA ostial regions from 72 patients who received CE-MRA of neck vessels, intracranial time of flight (TOF) MRA, and digital subtraction angiography (DSA) were retrospectively reviewed. The sensitivity and specificity of the CE-MRA in detection of ostial stenosis were calculated with reference standard of DSA. Ostial stenosis on MRA was correlated with coincidental lesions in intracranial and cervical arteries by logistic regression analysis. The sensitivity and specificity of the CE-MRA were 100% and 80.4% for detection of significant stenosis. In case of significant stenoses, CE-MRA showed a tendency of overestimation with a false-positive rate of 52.5%. Logistic regression analysis showed that the stenoses of middle cerebral artery (MCA) on TOF MRA was associated with significant stenoses of VA ostia (OR = 5.84, 95% confidence intervals 1.41-24.17). CE-MRA is sensitive in detection of VA ostial stenosis although it has high false-positive rate. True positive ostial stenosis should be considered in cases of coincidental stenoses of MCA on TOF MRA. (orig.)

  15. 3D non-contrast-enhanced ECG-gated MR angiography of the lower extremities with dual-source radiofrequency transmission at 3.0 T: Intraindividual comparison with contrast-enhanced MR angiography in PAOD patients.

    Science.gov (United States)

    Rasper, Michael; Wildgruber, Moritz; Settles, Marcus; Eckstein, Hans-Henning; Zimmermann, Alexander; Reeps, Christian; Rummeny, Ernst J; Huber, Armin M

    2016-09-01

    To compare prospectively image quality and diagnostic confidence of flow-sensitive 3D turbo spin echo (TSE)-based non-contrast-enhanced MR angiography (NE-MRA) at 3.0 T using dual-source radiofrequency (RF) transmission with contrast-enhanced MRA (CE-MRA) in patients with peripheral arterial occlusive disease (PAOD). After consent was obtained, 35 patients (mean age 69.1 ± 10.6 years) with PAOD stage II-IV underwent NE-MRA followed by CE-MRA. Signal-to-noise ratio and contrast-to-noise ratio were calculated. Subjective image quality was independently assessed by two radiologists and stenosis scoring was performed in 875 arterial segments. Sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) for stenosis classification were calculated using CE-MRA as a reference method. Diagnostic agreement with CE-MRA was evaluated with Cohen's kappa statistics. NE-MRA provided high objective and subjective image quality at all levels of the arterial tree. Sensitivity and specificity for the detection of relevant stenosis was 91 % and 89 %, respectively; the NPV was 96 % and the PPV 78 %. There was good concordance between CE-MRA and NE-MRA in stenosis scoring. 3D electrocardiography (ECG)-gated TSE NE-MRA with patient-adaptive dual-source RF transmission at 3.0 T is a promising alternative for PAOD patients with contraindications for gadolinium-based contrast agents. It offers high sensitivity and NPV values in the detection of clinically relevant arterial stenosis. • Flow-sensitive TSE NE-MRA is a promising technique for PAOD evaluation. • Diagnostic accuracy is comparable to contrast-enhanced MRA. • NE-MRA eliminates the risk of NSF in patients with renal insufficiency. • Costs arising from the use of contrast agents can be avoided.

  16. Intraindividual assessment of the thoracic aorta using contrast and non-contrast-enhanced MR angiography

    International Nuclear Information System (INIS)

    Tengg-Kobligk, Hendrik von; Gruenberg, K.M.; Giesel, F.L.; Ley-Zaporozhan, J.; Ley, S.; Henninger, V.; Kauczor, H.U.; Radiologische Universitaetsklinik Heidelberg; Boeckler, D.; Krummenauer, F.

    2009-01-01

    To avoid intravenous contrast media application, new MRA sequences using inherent blood contrast are available. The clinical use of these non-contrast-enhanced MRA (non-CE-MRA) sequences is still limited for the aorta. Thus, the goal was to compare a standard CE-MRA with a non-CE-MRA for the thoracic aorta. Ethics committee approval and informed consent were obtained. CE-MRA and non-CE-MRA (1.5T) were performed in the same 50 healthy volunteers (mean age: 48). CE-MRA: GRE-Turbo-Flash-3D (1.2 x 1.2 x 1.6 mm 3 ), 0.15 mmol Gd/kg, TA 22 ± 2sec. Non-CE-MRA: Respiratory-and cardiac-gated, T 2-prepared 3D-trueFISP (1.2 x 1.2 x 1.3 mm 3 ), TA 14 ± 5 min. Assessment included (3 readers, consensus): image quality (sharpness of vessel wall, signal homogeneity, artifacts) at the ascending aorta, arch, descending aorta and supra-aortic vessels. The image quality in the ascending aorta was rated 'excellent' in 78 %, 'moderate' in 22 %, 'poor' in 0 % for non-CE-MRA versus 22 %, 50 %, and 28 % for CE-MRA (Cohen's kappa = 29 %, McNemar p < 0.001). In a comparison of non-CE-MRA versus CE-MRA, the aortic arch and descending aorta showed no significant difference (kappa = 58 %/p = 0.250 and kappa = 100 %/p 1.000, respectively). Supra-aortic vessels were rated 'excellent' 45 %/49 %, 'moderate' 30 %/49 % and 'poor' 13 %/2 %, 12 % of supra-aortic vessels were visualized < 1 cm at non-CE-MRA. (orig.)

  17. ECG-gated quiescent-interval single-shot MR angiography of the lower extremities: Initial experience at 3 T

    International Nuclear Information System (INIS)

    Knobloch, G.; Gielen, M.; Lauff, M.-T.; Romano, V.C.; Schmitt, P.; Rick, M.; Kröncke, T.J.; Huppertz, A.; Hamm, B.; Wagner, M.

    2014-01-01

    Aim: To evaluate the feasibility of unenhanced electrocardiography (ECG)-gated quiescent-interval single-shot magnetic resonance angiography (QISS-MRA) of the lower extremities at 3 T. Materials and methods: Twenty-five patients with known or suspected peripheral arterial disease underwent ECG-gated QISS-MRA and contrast-enhanced MRA (CE-MRA) at 3 T. Two independent readers performed a per-segment evaluation of the MRA datasets. Image quality was rated on a four-point scale (1 = excellent to 4 = non-diagnostic; presented as medians with interquartile range). Diagnostic performance of QISS-MRA was evaluated using CE-MRA as the reference standard. Results: QISS-MRA and CE-MRA of all patients were considered for analysis, resulting in 807 evaluated vessel segments for each MRA technique. Readers 1 and 2 rated image quality of QISS-MRA as diagnostic in 97.3% and 97% of the vessel segments, respectively. CE-MRA was rated diagnostic in all vessel segments. Image quality of the proximal vessel segments, including the infrarenal aorta, iliac arteries, and common femoral artery, was significantly lower on QISS-MRA compared to CE-MRA [image quality score across readers: 2 (1,3) versus 1 (1,1) p < 0.001]. In the more distal vessel segments, image quality of QISS-MRA was excellent and showed no significant difference compared to CE-MRA [image quality score across readers: 1 (1,1) versus 1 (1,1) p = 0.036]. Diagnostic performance of QISS-MRA was as follows (across readers): sensitivity: 87.5% (95% CI: 80.2–92.4%); specificity: 96.1% (95% CI: 93.6–97.6%); diagnostic accuracy: 94.9% (95% CI: 92.6–96.5%). Conclusions: QISS-MRA of the lower extremities is feasible at 3 T and provides high image quality, especially in the distal vessel segments

  18. Magnetic resonance angiography of peripheral arteries of the hand and its clinical usefulness

    International Nuclear Information System (INIS)

    Arikawa, Kouzou

    1996-01-01

    We established requirements for display of peripheral arteries and veins of the hand on magnetic resonance angiography (MRA) in normal adults. We performed MRA in 20 normal adult volunteers and 3 patients using the same method and parameters and obtained useful clinical examinations. Few studies have evaluated the use of MRA in the hand, especially for peripheral arteries and veins, because of problems of vessel diameter, velocity blood flow, and computer memory capacity. The diagnostic accuracy of MRA is largely dependent on the MR equipment, MR technique, ray-tracing technique, film reading system, and the skill of the MRA film reader. Because MRA methods are not standardized, optimal methods must be determined that produce the accurate information needed for diagnosis of disease. In 20 normal adults, the following MRA parameters allowed us to consistently visualize the peripheral arteries and veins: flip angle, 90deg; TR, 35; TE, 16; slice thickness, 2 mm; FOV, 170; NSA, 2; acquisition matrix, 141 x 256; and room temperature, 22degC. We were able to obtain clear MRA images by the multiple slide slice method, which corrects a weakness of usual methods of display. Results of MRA examinations with our methods and parameters in 20 normal adult volunteers and 3 patients suggest that MRA is safe and useful for clinical examination of the hand. (author)

  19. Noncontrast-enhanced magnetic resonance renal angiography using a repetitive artery and venous labelling technique at 3 T: comparison with contrast-enhanced magnetic resonance angiography in subjects with normal renal function.

    Science.gov (United States)

    Park, Sung Yoon; Kim, Chan Kyo; Kim, EunJu; Park, Byung Kwan

    2015-02-01

    To investigate the feasibility of noncontrast-enhanced MR angiography (NC-MRA) using the repetitive artery and venous labelling (RAVEL) technique to evaluate renal arteries compared to contrast-enhanced MR angiography (CE-MRA). Twenty-five subjects with normal renal function underwent NC-MRA using a RAVEL technique and CE-MRA at 3 T. Two independent readers analysed the MRA images. Image quality, number of renal arteries, presence or absence of an early branching vessel, and diameter of the main renal arteries were evaluated. The overall image quality of NC-MRA was fair or greater in 88% of right and 92% of left renal arteries, while it was 96% in both sides with CE-MRA. On NC-MRA, the number of renal arteries in all subjects was perfectly predicted by both readers. Sensitivity and specificity for predicting early branching vessels were 82% and 100% for reader 1 and 82% and 95% for reader 2. Inter-modality agreement for comparing the diameters of main renal arteries was good or excellent at all segments for both readers. Inter-reader agreement was moderate or good at all segments except at the right distal segment on NC-MRA. NC-MRA with the RAVEL technique at 3 T may have comparable diagnostic feasibility for evaluating renal arteries compared to CE-MRA. • Accurate pre-treatment evaluation of renal artery anatomy helps clinical decision-making. • NC-MRA using RAVEL offers acceptable imaging quality for renal artery evaluation. • The 3 T RAVEL technique provides excellent diagnostic performance for renal artery evaluation. • The 3 T RAVEL technique may be an alternative to contrast-enhanced MRA.

  20. Classification and localization of acetabular labral tears

    International Nuclear Information System (INIS)

    Blankenbaker, D.G.; De Smet, A.A.; Keene, J.S.; Fine, J.P.

    2007-01-01

    The purpose of this study was to compare the findings on hip MR arthrography (MRA) with the published MRA and arthroscopic classifications of hip labral tears and to evaluate a clock-face method for localizing hip labral tears. We retrospectively reviewed 65 hip MRA studies with correlative hip arthroscopies. Each labrum was evaluated on MRA using the classification system of Czerny and an MRA modification of the Lage arthroscopic classification. In addition, each tear was localized on MRA by using a clock-face description where 6 o'clock was the transverse ligament and 3 o'clock was anterior. These MRA findings were then correlated with the arthroscopic findings using the clock-face method of localization and the Lage arthroscopic classification of labral tears. At MRA, there were 42 Czerny grade 2 and 23 grade 3 labral tears and 22 MRA Lage type 1, 11 type 2, 22 type 3 and 10 type 4 tears. At arthroscopy, there were 10 Lage type 1 flap tears, 20 Lage type 2 fibrillated tears, 18 Lage type 3 longitudinal peripheral tears and 17 Lage type 4 unstable tears. The Czerny MRA classification and the modified MRA Lage classification had borderline correlation with the arthroscopic Lage classification. Localization of the tears using a clock-face description was within 1 o'clock of the arthroscopic localization of the tears in 85% of the patients. The Lage classification, which is the only published arthroscopic classification system for hip labral tears, does not correlate well with the Czerny MRA or an MRA modification of the Lage classification. Using a clock-face description to localize tears provides a way to accurately localize a labral tear and define its extent. (orig.)

  1. Vene tüng / Arvo Pesti

    Index Scriptorium Estoniae

    Pesti, Arvo, 1956-2010

    2006-01-01

    28. aprillist kuni 4. maini Tallinnas toimunud II Vene Kino festivalist Baltimaades. Lähemalt mõnest nähtud filmist : Aleksandr Atanesjani "Lurjused" ("Svolotshi"), Deniss Neimandi "Vanaraud" ("Zhest"), Nikolai Dostali "Maailmarändur Kolja" ("Kolja-perekati-polje"), Roman Hrushtshi "Vedamine" ("Fart"), Marina Migunova "Krahv Montenegro" ja Galina Jevtushenko "Pööningulugu"

  2. Teplo, jeshtsho tepleje, gorjatsho!

    Index Scriptorium Estoniae

    2006-01-01

    28. aprillist kuni 4. maini toimub II Vene Filmide Kevadfestival : Aleksandr Atanesjani "Lurjused" ("Svolotshi"), Deniss Neimandi "Vanaraud", ekstsentriline komöödia "Rahapäev" ("Den deneg"), fantaasiaseiklus "Aziris-Nuna" Sergei Lukjanenko ja Juri Burkini romaani järgi, režissöör ja stsenarist Oleg Kompassov, Marina Migunova seikluskomöödia "Krahv Montenegro"

  3. Русский "Национальный бестселлер" достался Латвии

    Index Scriptorium Estoniae

    2003-01-01

    Aleksandr Garros ja Aleksei Jevdokimov (mõlevad elavad ja töötavad Riias) said kolmandana Venemaa kirjanduspreemia "Национальный бестселлер" põnevusromaani "Peamurdja" ("Голово[ломка]") eest

  4. "Национальный бестселлер" / Александр Гаррос, Алексей Евдокимов ; интервьюировал Борис Тух

    Index Scriptorium Estoniae

    Гаррос, Александр

    2003-01-01

    Aleksandr Garros ja Aleksei Jevdokimov (mõlevad elavad ja töötavad Riias) said kolmandana Venemaa kirjanduspreemia "Национальный бестселлер" põnevusromaani "Peamurdja" ("Головоломка") eest

  5. "Medvezhii" ugol Jevrosojuza / Jevgeni Ashihmin

    Index Scriptorium Estoniae

    Ashihmin, Jevgeni

    2007-01-01

    Regionaalminister Vallo Reimaa, Ida-Virumaa maavanem Riho Breivel, Kirde-Eesti piirivalveülem Aimar Kess, Alajõe vallavanem Natalja Varkki, Vasknarva külavanem Vadim Ivanov ja kohalik aktivist Aleksandr Petuhhov arutasid Alajõe valla ja Vasknarva küla probleeme

  6. Poslanije ot propavshih ekspeditsi / Aleksandra Manukjan

    Index Scriptorium Estoniae

    Manukjan, Aleksandra

    2001-01-01

    Kadunud ekspeditsioonidele pühendatud näitusest (mereteemalised pildid ja paberist jäämäed peidetud proviandiga) Tallinna Meremuuseumis, autoriteks Roman Matkiewicz ja Aleksandr Belanov (Moskva, rühmitus MEKVA). Lühidalt rühmitusest Mekva.

  7. Poeetilisest mõõtmest / Aare Pilv

    Index Scriptorium Estoniae

    Pilv, Aare, 1976-

    2016-01-01

    Luule tõlkimisest, selgitades mõistet "poeetiline mõõde". Artikli teises pooles käsitletakse ka sama keeleruumi klassikaliste luuletuste tõlkimist tänapäeva keelde, kasutades Aleksandr Puškini luuletuse "A. P. Kernile" näidet

  8. Muzei bez sten / Tatjana Pissareva

    Index Scriptorium Estoniae

    Pissareva, Tatjana

    2005-01-01

    Skulptori, graafiku ja maalikunstniku Rafael Arutjunjani loomingut kajastavast raamatust "Rafael Arutjunjan. Proizvedenija iskusstva" räägib raamatu väljaandja Areg Arutjunjan. Reprod ja fotod on Valeri Baretalt ja Sergei Didõkilt. Artiklite autorid on Boris Bernshtein, Aleksandr Sidorov ja Emma Darvis

  9. Baltic region going nuclear

    Index Scriptorium Estoniae

    2011-01-01

    Läti keskkonnaminister Raimonds Vejonis leiab, et Läti ei peaks investeerima Leetu rajatava tuumaelektrijaama ehitusse ja võiks panustada hoopis taastuvenergiale. Venemaa peaminister Vladimir Putin ja Valgevene president Aleksandr Lukašenko allkirjastasid kokkuleppe Valgevene ja Leedu piiri lähistele uue tuumajaama ehitamise kohta. Leedu ei ole selle projektiga nõus

  10. "Золотая Маска в Эстонии": на сцене - Волга! / Николай Караев

    Index Scriptorium Estoniae

    Караев, Николай, 1978-

    2009-01-01

    6-13. oktoobril toimub Eestis teatrifestival "Kuldne Mask Eestis 2009". Näha saab nelja lavastust: Aleksandr Ostrovski "Äike", lavastaja Lev Ehrenburg, Shakespeare' "Kaheteistkümnes öö", lavastaja Declan Donnellan, Fjodor Dostojevski "Onukese unenägu", lavastaja Temur Tšheidze ja Alvis Hermanise "Šukšini lood"

  11. Kuidas tabada glamuuri / Irina Kiviselg

    Index Scriptorium Estoniae

    Kiviselg, Irina, 1961-

    2008-01-01

    Fotoglamuuri päev Jõhvi Kultuuri- ja Huvikeskuses. Dmitri Bazarovi töötuba "Mina olen fotomodell", Irina Kivimäe stuudio "Ahh, suvi!", Sergei Drozdiki meistrikoda. Vanade fotoaparaatide näitus. Fotokonkursi "Suvemälestus" võitis Aleksandr Bõstrov

  12. XVI "Baltiiski dom" : klassika v raznõhh izmerenijahh / Eteri Kekelidze

    Index Scriptorium Estoniae

    Kekelidze, Eteri, 1944-

    2006-01-01

    16. rahvusvahelisest teatrifestivalist "Baltiiski dom" Peterburis. Pikemalt vaadeldakse lavastusi : Anton Tshehhovi "Onu Vanja" (Belgia teater "Toneelhuis", lavastaja Luk Perceval), "Kolm õde" (lavastaja Rimas Tuminas), Goethe "Faust" (lavastaja Eimuntas Nekroshius), "Kosmos" (Witold Gombrowiczi romaani järgi lavastanud Jerzy Jarocki), Aleksandr Ostrovski "Mets" (Moskva Kunstiteater, lavastaja Kirill Serebrjannikov). Mainitakse, et festivalil osales ka Ugala teater Oleg Titovi lavastusega "Libahunt"

  13. Mis teeb klassikast klassika / Eteri Kekelidze ; tõlk. Virge Harak

    Index Scriptorium Estoniae

    Kekelidze, Eteri, 1944-

    2007-01-01

    16. rahvusvahelisest teatrifestivalist "Baltiiski dom" ("Balti kodu") Peterburis : Anton Tshehhovi "Onu Vanja" (Belgia teater "Toneelhuis", lavastaja Luk Perceval), "Kolm õde" (lavastaja Rimas Tuminas), Goethe "Faust" (lavastaja Eimuntas Nekroshius), "Kosmos" (Witold Gombrowiczi romaani järgi lavastanud Jerzy Jarocki), Aleksandr Ostrovski "Mets" (Moskva Kunstiteater, lavastaja Kirill Serebrjannikov), Sergei Korobkovi "Phaidra. Kuldne koloss" (Moskva Rahvuste Teatri projekt, lavastaja Andrii Zholdak)

  14. Tshto delajet klassiku klassikoi / Eteri Kekelidze

    Index Scriptorium Estoniae

    Kekelidze, Eteri, 1944-

    2006-01-01

    16. rahvusvahelisest teatrifestivalist "Baltiiski dom" ("Balti kodu") Peterburis : Anton Tshehhovi "Onu Vanja" (Belgia teater "Toneelhuis", lavastaja Luk Perceval), "Kolm õde" (lavastaja Rimas Tuminas), Goethe "Faust" (lavastaja Eimuntas Nekroshius), "Kosmos" (Witold Gombrowiczi romaani järgi lavastanud Jerzy Jarocki), Aleksandr Ostrovski "Mets" (Moskva Kunstiteater, lavastaja Kirill Serebrjannikov), Sergei Korobkovi "Phaidra. Kuldne koloss" (Moskva Rahvuste Teatri projekt, lavastaja Andrii Zholdak)

  15. Sots-art - Nõukogude Liit kuubis / Ants Juske

    Index Scriptorium Estoniae

    Juske, Ants, 1956-2016

    2007-01-01

    Sots-arti (pop-arti ja sotsialistliku realismi irooniline ühendus) sünnist ja arengust Venemaal. Termini leiutamine omistatakse Vitali Komarile ja Aleksandr Melamidile. Eestis kasutas nõukogulikku atribuutikat Leonhard Lapin, kes kasutas terminit liit-pop

  16. "By Taste and the Spirit of the Times …" The Professor as Slave

    Science.gov (United States)

    Kabatskov, A. N.; Leybovich, O. L.

    2017-01-01

    The authors examine how the social status of the university professor has evolved in Russia in recent centuries in light of the historical concepts about the enslavement and emancipation of social groups proposed by Sergey Solovyov and Aleksandr Gradovsky. They use the metaphor of the "slave" [nevol'nik] to describe the dependent…

  17. Restoran Kaerajaan = Kaerajaan Restaurant / Margit Mutso

    Index Scriptorium Estoniae

    Mutso, Margit, 1966-

    2009-01-01

    Tallinnas Raekoja plats 17 asuva restorani rahvuslikel motiividel baseeruvast sisekujundusest. Sisearhitektid Janno Roos ja Andres Labi (Ruumilabor). Arhitektuuriajaloolised eritingimused koostas Aleksandr Pantelejev. Lakke ja seinale maalitud muster (Loovool) pälvis Red Dot'i auhinna. Žürii hinnang kultuurikapitali aastapreemiale esitatud sisekujundusele

  18. Писатели-эстонцы в русской литературе и писатели русского происхождения в эстонской литературе (о литературном билингвизме и "билитера

    Index Scriptorium Estoniae

    Бассель, Нафтолий, 1932-2016

    2006-01-01

    Eesti kirjanikest vene kirjanduses ja vene kirjanikest eesti kirjanduses: Aleksandr Sheller-Mihhailov, Valmar Adams, Boriss Taggo-Novossadov, Juri Ivask, Jelizaveta Roos, Meta Roos, Liidia Toom, Leon Toom, Romuald Minna, Hans Leberecht, Ahto Levi (tegelikult Levi Lippu), Jaan Kaplinski, Aleksis Rannit (tegelikult Aleksei Dolgošov), Juri Šumakov, Valeria Ränik (tegelikult Poprjanik)

  19. Писатели-эстонцы в русской литературе и писатели русского происхождения в эстонской литературе (о литературном билингвизме и "билитера

    Index Scriptorium Estoniae

    Бассель, Нафтолий, 1932-2016

    2007-01-01

    Eesti kirjanikest vene kirjanduses ja vene kirjanikest eesti kirjanduses: Aleksandr Šeller-Mihhailov , Valmar Adams, Boriss Taggo-Novossadov, Juri Ivask, Jelizaveta Roos, Meta Roos, Liidia Toom, Leon Toom, Romuald Minna, Hans Leberecht, Ahto Levi (tegelikult Levi Lippu), Jaan Kaplinski, Aleksis Rannit (tegelikult Aleksei Dolgošov, Juri Šumakov, Valeria Ränik (tegelikult Poprjanik)

  20. Kaks kiirpilku festivalile "Credo" / Igor Garšnek

    Index Scriptorium Estoniae

    Garšnek, Igor, 1958-

    2011-01-01

    Rahvusvahelise õigeusu vaimuliku muusika festivali "Credo" raames toimunud kahest kontserdist: 21. septembril Kaarli kirikus toimunud müsteeriumist "Jumalaema palve", esitajaks festivali "Credo" meesansambel Stanislav Šeljahhovski dirigeerimisel ja 13. septembril Tallinna Jaani kirikus toimunud Pariisi Neeva vaga suurvürsti Aleksandri paekiriku koori kontserdist ülemdiakon Aleksandr Kedrovi juhatusel

  1. Eesti-Ameerika ühisfilm lõpuks kohal

    Index Scriptorium Estoniae

    2001-01-01

    Eilsest linastub kobarkinos Coca-Cola Plaza "Virtuoos" ("Out of the Cold") : režissöör Aleksandr Bulavsky : operaator Vladimir Klimov : peaosas Keith Carradine : Ameerika Ühendriigid - Eesti 1999. Väiksemates rollides teeb kaasa mitmeid eesti näitlejaid

  2. Orwelli nimekiri / Mihhail Lotman

    Index Scriptorium Estoniae

    Lotman, Mihhail, 1952-

    2014-01-01

    Aleksandr II-le sooritatud atentaadikatsest 1866. aastal. Heinrich Bölli teosest "Katharina Blumi kaotatud au, ehk, Kuidas vägivald võib tekkida ja kuhu välja viia". Senaator Joseph McCarthy'st. George Orwelli poolt Informatsiooniuuringute osakonnale esitatud nimekirjast. Orwelli eluloost

  3. Reliikvia 33 aastat hiljem / Piret Tali

    Index Scriptorium Estoniae

    Tali, Piret, 1972-

    2002-01-01

    Soomes restaureeritud eesti menufilmi "Viimne reliikvia" (1969) taas Eestis ekraanile jõudmise eel korraldatud pressikonverentsilt Coca-Cola Plazas, kus kohal filmis osalenud näitlejad Ingrida Andrina, Aleksandr Goloborodko, Eve Kivi ja Uldis Vazdik, stsenarist Arvo Valton ja kunstnik Rein Raamat

  4. Trebujetsja hladnokrovnõi Vinni-Puhh / interv. Jana Toom

    Index Scriptorium Estoniae

    2008-01-01

    Kesk-Euroopa Ülikooli rahvusvaheliste suhete professor Aleksandr Astrov ja Eesti Ekspressi ajakirjanik Andrei Hvostov räägivad pronkssõduri teisaldamisega kaasnenud Venemaa meediahuvist ja integratsioonist. A. Astrov võrdles mitte-eestlaste integreerimist Eestis juutide inkvisitsiooniga keskaegses Hispaanias ning seostas eestimeelsuse nõuet muulaste inkvisitsiooniga

  5. KGB skandaal lämmatab Itaalia peaministrit / Heiki Suurkask

    Index Scriptorium Estoniae

    Suurkask, Heiki, 1972-

    2006-01-01

    FSB kindralpolkovnik Anatoli Trofimov olevat kinnitanud Itaalia peaministri Romano Prodi sidemeid KGB-ga. Autori väitel kuulis itaallane Mario Scaramella Aleksandr Litvinenkolt ilmselt uusi fakte R. Prodi kohta. M. Scaramella organismist leiti jälgi poloonium 210 isotoopidest, polooniumi jäljed viivad Moskvasse. Lisa: Mürgitamise uurimine Venemaale

  6. Appi, pea lõhub / Marika Makarova

    Index Scriptorium Estoniae

    Makarova, Marika

    2010-01-01

    Vestlusest Ida-Tallinna Keskhaigla neuroloogiaosakonna juhataja ja peavalukeskuse rajaja dr Toomas Toomsooga ning Aurea ajurveeda- ja massaažikeskuse ajurveedaarsti Aleksandr Dreljoviga peavalust: peavalu ravi india ajurveeda seisukohalt, läänemeditsiini peavalu tüübid ning nende ravi jne

  7. Esietendus

    Index Scriptorium Estoniae

    2000-01-01

    22. sept. esietendused teatrites - Eesti Draamateatris "Mälestused. Ainult ei tea millest" Mikk Mikiveri lavastuses, Tallinna Linnateatris "Clavigo" saksa külalislavastaja Andrea Mosese lavastuses ja Vene Draamateatris "Lavalised segadused", mille tõi lavale vene külalislavastaja Aleksandr Issakov

  8. Ida-Euroopa kunstnikud koostöövalmis

    Index Scriptorium Estoniae

    2002-01-01

    21. II-31. III Tallinna Kunstihoones Viinis ja Budapestis tegutseva galeristi ja kuraatori Hans Knolli koostatud näitus "An artist who does not speak English is not an artist". Osalevad Lucehezar Boyadijev (Sofia), Aleksandr Brener, Barbara Schurz (Moskva, Viin), Rza El-Hassan (Budapest), Kai Kaljo, Roman Ondák (Bratislava), Mladen Stilinovic (Zagreb), Milica Tomic (Belgrad). Avamisel K. Kaljo performance

  9. Estonian leader voices worry over Russia / Michael Abramowitz

    Index Scriptorium Estoniae

    Abramowitz, Michael

    2006-01-01

    USA presidendi George W. Bushi 28. novembril 2006. a. toimunud Eesti visiidi ajal oli presidentide vahelise vestluse läbivaks probleemiks Venemaa aina kasvav autokraatia ja despotism, mis on välja viinud juba esimeste arvatavate poliitmõrvadeni Kremli tuliste kriitikute Anna Politkovskaja ja Aleksandr Litvinenko näol

  10. Vene võim hävitas Kopli kalmistu / Robert Nerman

    Index Scriptorium Estoniae

    Nerman, Robert, 1946-2015

    2004-01-01

    Tallinna Kopli kalmistu ajaloost ja arhitektuuriajaloolisest väärtusest. Kabelite asendiplaani koostas 1774. a. arhitekt Johann Schultz. Tõenäoliselt kavandas Johann Schultz ka osa arvukatest kabelitest. Õigeusukalmistule rajati paekivist kabel arhitekt Aleksandr Vladovski projekti järgi

  11. "Святому братству верен я..." / Валерия Бобылева, Марат Гайнуллин

    Index Scriptorium Estoniae

    Бобылева, Валерия, 1945-

    1999-01-01

    A. Puškin ja Tsarskoje Selo lütseum: rektoritest Vassili Malinovskist ja Jegor Engelhardtist, lütseistidest Vladimir Volhovskist, Fjodor Matjuškinist, Mihhail Jakovlevist, Wilhelm Küchelbeckerist, Aleksandr Gortšakovist ja Aleksei Illitševskist. Ka nende sidemetest Eestiga (reisid, suguvõsad)

  12. Moskvas tasub vaadata vene filme / Kristiina Davidjants

    Index Scriptorium Estoniae

    Davidjants, Kristiina, 1974-

    2009-01-01

    Moskva 31. rahvusvahelise filmifestivalist. Auhinnatud filmidest : peauhinna Püha Jüri saajast Nikolai Dostali mängufilmist "Petja teel taevariiki", FIPRESCI poolt auhinnatud Kira Muratova filmist "Meloodia väntorelile",eriauhinna saanud Aleksandr Proškini filmist "Ime", Karen Šahnazarovi Tšehhovi ekraniseeringust "Palat nr. 6". Lisatud peaauhindade nimekiri

  13. Värdjatest, kui mitte muust / Karlo Funk

    Index Scriptorium Estoniae

    Funk, Karlo, 1971-

    1999-01-01

    Mängufilmid "Tantsija aeg" ("Vremja tantsora") : Stsenarist Aleksandr Mindadze : režissöör Vadim Abdrashitov : Venemaa 1997 ja "Värdjatest ja inimestest" ("Pro urodov i ljudei") : Stsenarist ja režissöör Aleksei Balabanov : Venemaa - Ameerika Ühendriigid 1998

  14. Lastemuuseum Miia-Milla-Manda = The Miia-Milla-Manda Children's Museum / Margit Mutso

    Index Scriptorium Estoniae

    Mutso, Margit, 1966-

    2010-01-01

    Tallinnas Koidula 21A asuva hoone restaureerimisest, lastemuuseumi sisekujundusest. Kadrioru Lastepargi paviljoni (arhitekt Villem Seidra, 1937) renoveerimisprojekti tegi arhitekt Katrin Etverk, sisearhitektid ja ekspositsiooni kujundus: Maile Grünberg, Eliina Grünberg (Grünberg oü). Ajaloolane Aleksandr Pantelejev. Žürii liikme Mait Summataveti hinnang kultuurkapitali aastapreemiale esitatud hoonele

  15. Nõmme Lunastaja kirik = The Saviour's Lutheran Church in Nõmme / Margit Mutso

    Index Scriptorium Estoniae

    Mutso, Margit, 1966-

    2010-01-01

    Tallinnas Õie 10 asuva kirikuhoone (arhitekt Robert Natus, 1932) restaureerimisest. Arhitekt Fredi-Armand Tomps, sisearhitekt Anne Koppel, ehitusjärelevalve: Rein Joller, ajaloolane Aleksandr Pantelejev. Žürii liikme Mait Summataveti hinnang EK arhitektuuri sihtkapitali 2009. a. restaureerimispreemia pälvinud hoonele

  16. Toompea komandandimaja = The Commandant's House in Toompea / Margit Mutso

    Index Scriptorium Estoniae

    Mutso, Margit, 1966-

    2010-01-01

    Tallinnas Toompea 1 asuva hoone restaureerimisest. Arhitekt Raul Vaiksoo, kaasautor Kristo Vaiksoo (Raul Vaiksoo Arhitektuuribüroo), sisearhitektid Priit Põldme, Rita Rahu (SAB Joonprojekt), Raul Vaiksoo, ajaloolased Raul Vaiksoo, Aleksandr Pantelejev. Žürii liikme Mait Summataveti hinnang kultuurkapitali aastapreemiale esitatud hoonele

  17. Lenini kaitseks / Vaapo Vaher

    Index Scriptorium Estoniae

    Vaher, Vaapo, 1945-

    2002-01-01

    Ilmunud ka: Vaher, Vaapo. Kokaiin Balti jaama turult: miniatuure vene kultuurist. Tallinn : Sirp, 2003, lk. 157-159. Mängufilm "Taurus" ("Telets") : stsenarist Juri Arabov : režissöör ja operaator Aleksandr Sokurov : Venemaa 2000. Autor pole rahul Lenini kujutamise kontseptsiooniga filmis

  18. Tshelovek bez litsa vtjanul BABa v ubiistvo

    Index Scriptorium Estoniae

    2007-01-01

    Vene peaprokuratuuri esindajad küsitlesid Aleksandr Litvinenko surma asjus Londonis Boriss Berezovskit ja Ahmed Zakajevit. B. Berezovski oma vestlusest Vene uurijatega. Artiklis väidetakse, et telesaates "Vesti nedeli" avalikustatud Vene eriteenistuse endise kaastöötaja ülestunnistused viivad mõttele, et A. Litvinenko surma võib olla segatud B. Berezovski ise

  19. Rice targets Lukashenko during NATO meeting in Vilnius / Milda Seputyte

    Index Scriptorium Estoniae

    Seputyte, Milda

    2005-01-01

    Ameerika Ühendriikide välisminister Condoleezza Rice kritiseeris NATO tippkohtumisel Valgevene presidenti Aleksandr Lukashenkot, nimetades tema režiimi Euroopa viimaseks diktatuuriks. NATO tippkohtumisest Leedus. Lisad: NATO foorumi kultuuriline programm; NATO peasekretär Jaap de Hoop Scheffer

  20. "Idiot" polutshil premiju

    Index Scriptorium Estoniae

    2004-01-01

    Fjodor Dostojevski romaani "Idioot" ekraniseeringus Venemaa televisioonis mängib Jevgeni Mironov vürst Mõshkinit : režissöör Vladimir Bortko : Venemaa 2003. Nende tööde eest said J. Mironov ja V. Bortko Aleksandr Solzhenitsõni kirjanduspreemia

  1. Svet "Tjomnõh notshei" / Eteri Kekelidze

    Index Scriptorium Estoniae

    Kekelidze, Eteri, 1944-

    2002-01-01

    Pimedate Ööde Filmifestivali filme - Lukas Moodyssoni "Lilja 4-ever", Aleksandr Mitta "Kõrvetav laupäev" ("Raskalennaja subbota"), Valeri Fokini "Metamorfoos" ("Prevrashtshenije") ja Andrei Kontshalovski "Hullumaja" ("Dom durakov"), millega seoses andis režissöör ka pressikonverentsi Sakala keskuses

  2. "Jääminek" 40 aastat hiljem / Veste Paas

    Index Scriptorium Estoniae

    Paas, Veste, 1931-2002

    2002-01-01

    Mängufilm "Jääminek" : stsenarist Aadu Hindi teose järgi Aleksandr Bortšagovski : režissöör Kaljo Kiisk : Tallinnfilm 1962. Filmi võrreldakse 1943. a. valminud ukraina režissööri Mark Donskoi filmiga "Vikerkaar" ("Raduga")

  3. Saladusliku Sandu Hubani miljonid / Peeter Raidla

    Index Scriptorium Estoniae

    Raidla, Peeter, 1955-

    2005-01-01

    Eesti ühe edukaima hokiklubi Välk 494 rahastaja Sandu Hubani alias Aleksandr Gubani tegevusest, ettevõtlusest ja äritegevusest. Lisad: Hubani osalused firmades; Ettevõtted, millega Huban enam seotud ei ole; Välk 494 seob Hubani ja tema äripartnereid. Kommenteerivad Meelis Birk, Enriko Lukecha, Aivo Pärn

  4. Pööras võimu / Aivar Hundimägi

    Index Scriptorium Estoniae

    Hundimägi, Aivar, 1975-

    2010-01-01

    Paldiskis kohalikud valimised võitnud Aleksei Tšuletsile ja tema äripartnerile Aleksandr Nakonetšnõile kuulunud osalus firmades Saurix Petroleum ja Infast Oil liikus Hollandi Antillidel registreeritud ettevõttele CNP Investment N.V. Olulisest muutusest Tšuletsi ja Nakonetšnõigaga seotud ettevõtete omanikeringis 2006. a

  5. "Мы звучим для иностранцев - как музыка" / Валентина Белецкая ; интервьюировала Тийа Линнард

    Index Scriptorium Estoniae

    Белецкая, Валентина, 1947-

    2009-01-01

    Näitleja, teatripedagoogi ja lavastaja Valentina Beletskajaga Lev Timofejevi näidendi "Москва. Моление о чаше" lavastusest, abikaasast - näitlejast Aleksandr Markovist. Beletskaja ja Markov on Peterburi erateatri ja kooli "Russkije Notši" asutajad

  6. Загадочное исчезновение акций / Артур Тооман

    Index Scriptorium Estoniae

    Тооман, Артур, 1971-

    2009-01-01

    Zircon Technologies AS-i ostu jaoks Gate Capital OÜ loonud isikud väidavad, et üks ettevõtte loojatest - Aleksandr Kuzin, olles ainus juhatuse liige mõlemas ettevõttes, kandis 51% aktsiatest oma ettevõttele Pidev OÜ ja kandib ettevõtte vara oma firmadele

  7. Театральным проектам дали субсидии / Лилия Крысина

    Index Scriptorium Estoniae

    Крысина Лилия

    2010-01-01

    Eesti Kultuuriministreerium toetab rahaliselt kaheksat teatriprojekti, millede hulgas on Rotermanni kvartalis asuvas Nisu- ja rukkiveskis toimuv performance "Live News Project" (projekti autor-lavastaja on Aleksandr Dzjuba); Eesti Draamateatri lavastustele venekeelse sünkroontõlke subsideerimine; Vene Teatri teatristuudio ja Nuku- ja Noorsooteatri noortestuudio ühisprojekt "Võimalused"

  8. Актерский тренинг в режиме нон-стоп / Лилия Крысина

    Index Scriptorium Estoniae

    Крысина, Лилия

    2010-01-01

    5. septembril (5.00-24.00) on Rotermanni kvartalis asuvas Nisu- ja rukkiveskis performance "live news project". Projekti autor ja lavastaja on Aleksandr Dzjuba, kes ka performance'i mõtet tutvustab. Eesti Draamateatri näitleja Mari-Liis Lill räägib kuidas toimuvad proovid

  9. Tougher times for the ruling center-right / Rokas M. Tracevskis

    Index Scriptorium Estoniae

    Tracevskis, Rokas M.

    2010-01-01

    Viimaste sisepoliitiliste muutuste tagajärjel on Leedus praegu võimul vähemusvalitsus. Kui parlament avaldab umbusaldust Linas Karaliusele ja Aleksandr Sacharukile, kellest esimene puudus istungitelt ja teine hääletas parlamendis tema eest, võib koalitsioon saada parlamendis kaks lisakohta. Endise Leedu suursaadiku Gruusias arvamus

  10. V "Ovode" Oleg Strizhenov fehtoval bez shpagi / Oleg Peranov

    Index Scriptorium Estoniae

    Peranov, Oleg

    2005-01-01

    Mängufilm "Kiin" ("Ovod") Ethel Lilian Voynichi romaani järgi : režissöör Aleksandr Faintsimmer : helilooja Dmitri Shostakovitsh : peaosas Oleg Strizhenov : NSV Liit 1955. Filmivõtetest ja vastuvõtust esilinastuse 50. aastapäeva puhul

  11. High court orders Lavents retrial / Ib Alken

    Index Scriptorium Estoniae

    Alken, Ib

    2003-01-01

    Pärast Euroopa Inimõiguste Kohtu otsust, mille kohaselt rikkus Läti riik Banka Baltija endise juhi Aleksandrs Lavents'i kohtuasja menetlemisel tema põhiõigusi, mõistis Läti Riigikohus asja uuesti läbivaatamisele

  12. Ljubimaja zhenshtshina artista Viktora Bõtshkova / Nikolai Hrustaljov

    Index Scriptorium Estoniae

    Hrustaljov, Nikolai

    2003-01-01

    Parima filmi auhinna "Zolotoi Oven" sai Aleksandr Rogozhkini "Kägu" ("Kukushka"), parima režissööri auhinna sai Kira Muratova filmiga "Tšehhovi motiivid" ("Tshehhovskije motivõ"). Lähemalt auhinnatseremooniast. Lisatud ka laureaatide nimekiri

  13. Из Прибалтики - в Европу / Сергей Исаков

    Index Scriptorium Estoniae

    Исаков, Сергей, 1931-2013

    2004-01-01

    1831. a. Tallinnas ilmunud Aleksandr Gribojedovi näidendi "Häda mõistuse pärast" tõlkest saksa keelde (tõlkija Karl Knorring). Tõlge ilmus K. Knorringi välja antud seerias "Russische Bibliothek für Deutsche". Ka tõlke tsenseerimisest ja tsensorist Johann Friedrich von Erdmannist

  14. Litvinenko mõrva uurib Interpol / Tuuli Aug, Ravil Khair Al-Din

    Index Scriptorium Estoniae

    Aug, Tuuli

    2006-01-01

    Seoses Aleksandr Litvinenko mürgitamisega Londonis kuulati Venemaal üle ärimees Andrei Lugovoi. Saksa uurijad on veendunud, et polooniumi tõi Moskvast Saksamaale Dmitri Kovtun. Vene uurijad kavatsevad mõningatel andmetel Suurbritannias üle kuulata Boriss Berezovski ja Ahmed Zakajevi. Lisa: Polooniumijälg kui buldooserivagu

  15. Ahmed Zakajev: Litvinenko tapeti, sest ta abistas omakasupüüdmatult tšetšeene / Tõnis Erilaid

    Index Scriptorium Estoniae

    Erilaid, Tõnis, 1943-

    2007-01-01

    Vene ajalehes Kommersant ilmus intervjuu endise Itškeeria ministri Ahmed Zakajeviga, kes ei kahtle, et Aleksandr Litvinenko tapmisega on seotud Andrei Lugovoi. Suurbritannia politsei tegutseb täie tõsidusega, et sundida Venemaad Andrei Lugovoid välja andma

  16. Metslase taltsutamine ja rahvusühtlus / Jaan Ruus

    Index Scriptorium Estoniae

    Ruus, Jaan, 1938-2017

    2002-01-01

    Venemaa mängufilmide "Vend" (1997), "Vend 2" (2000) ja "Sõda" (2002) : režissöör Aleksei Balabanov ja "Puhastustuli" (1997) : režissöör Aleksandr Nevzorov, näitel Venemaa ja Tšetšeenia sõjast. Võrdlusena ameerika vesternid

  17. MIFF 2002 / Marianne Kõrver

    Index Scriptorium Estoniae

    Kõrver, Marianne, 1980-

    2002-01-01

    Moskva 24. rahvusvahelise filmifestivali filme. Nikolai Baturini romaani "Karu süda" põhjal vändatud Arvo Iho filmi näitamisele järgnenud pressikonverentsist. Ka FIPRESCI auhinna saanud Aleksandr Rogozhkini filmist "Kägu". Lisatud laureaatide nimekiri

  18. "Nika" s mongolo-kazahskim aktsentom / Boris Tuch

    Index Scriptorium Estoniae

    Tuch, Boris, 1946-

    2008-01-01

    Venemaa filmiauhinna "Nika" võitis Sergei Bodrovi mängufilm "Mongol". Aleksandr Sokurov, Nikita Mihhalkov ja Vladimir Hotinenko ei lubanud oma filme auhindamisele esitada. Vastuoludest teise vene kinoakadeemia auhinna "Kuldne Kotkas" komiteega ning võõrfilmi Oscari mittemääramisest sel aastal Vene filmidele

  19. Jänese mälestusmärk

    Index Scriptorium Estoniae

    2000-01-01

    Venemaal Pihkva oblastis Mihhailovskojes on mälestusmärk jänesele, kes takistas 1825. a. Aleksandr Pushkinil Peterburi dekabristide juurde sõitmast ja päästis nii poeedi elu - verstapost, millel on kiri "Senati väljakuni on 416 versta"

  20. Трое неизвестных / Николай Караев

    Index Scriptorium Estoniae

    Караев, Николай, 1978-

    2010-01-01

    Tallinnas jagati Juri Dolgorukovi nim. kirjandusauhindu. I preemia võitis Maks Frai ulmeromaaniga "Большая телега", Eestist pärit Aleksandr Degterenko sai diplomi jutustusega "Al Sacrum". Preemia on määratud vene kirjanikele Lätis, Leedus ja Eestis

  1. Kirsteins survives vote, but doesn't escape criticism

    Index Scriptorium Estoniae

    2005-01-01

    Läti parlamendi väliskomisjoni esimehe Aleksandrs Kirsteins umbusaldushääletus kukkus läbi, kuna 53 parlamendiliiget hääletas esimehe tagandamise vastu. Umbusalduse põhjuseks sai Kirsteinsi intervjuu, kus ta tegi ettepanku sõlmida piirileping Venemaaga sarnaselt 1940. aastal Saksamaaga sõlmitud leppele

  2. Elu mütoloogilises psühhoruumis / Vaapo Vaher

    Index Scriptorium Estoniae

    Vaher, Vaapo, 1945-

    2009-01-01

    Tutvustus: Lukjanenko, Sergei. Öine Vahtkond / tlk. Tanel Rõigas. Tallinn : Varrak, 2008 ; Rubina, Dina. Päikeselisel tänavapoolel / tlk. Veronika Einberg. Tallinn : Tänapäev, 2008 ; Suhhotšev, Aleksandr. Goa sündroom / tlk. Veronika Einberg. Tallinn : Tänapäev, 2008

  3. Kas Venemaa ülemrabil on õigus?

    Index Scriptorium Estoniae

    2004-01-01

    Ilmunud ka: Severnoje Poberezhje, 20. juuli 2004, lk. 2. Venemaa ülemrabi Berl Lazar pöördus Euroopa Komisjoni presidendi Romano Prodi poole üleskutsega anda hinnang Eesti võimude tegevusele, mis rabi meelest soosib kohalikke natse. Küsimusele vastab Ida-Viru juudi kogukonna juht Aleksandr Dusman

  4. Vremja rozhdestvenskihh prizov / Timofei Borin

    Index Scriptorium Estoniae

    Borin, Timofei

    2001-01-01

    Fondi "Rõõmukuulutus" jõulupreemiad pälvisid ka Vene Draamateatri näitlejad Ljubov Agapova, Jelena Jakovleva, Natalja Romanova, Aleksandr Ivashkevitsh, Ilja Nartov, Herardo Kontreras, teatrikunstnik Vladimir Anshon, kostüümikunstnik Jaanus Orgussaar ja stuudioteatri "Hulkuv koer" kunstiline juht Oleg Shtshigorets

  5. Peterburis maandusid tulnukad - Rasmus Merivoo juhatab vägesid! / Kristiina Davidjants

    Index Scriptorium Estoniae

    Davidjants, Kristiina, 1974-

    2008-01-01

    Peterburis Eesti-Vene koostöös sündiva mängufilmi "Buratino" võtetel. Režissöör on Rasmus Merivoo, nimiosas Mikk Nurga, Carabas Barabasi rollis Jaan Rekkor, operaator Aleksandr Kornejev, Eestipoolsed produtsendid Mati Sepping ja Tiina Lokk

  6. Kiwa Frankfurdis : great big fuck!

    Index Scriptorium Estoniae

    1999-01-01

    Frankfurdis 20.-21. XI toimunud kongressil Ida-Euroopa kunstist näitas kuraator Dmitry Vilensky enne oma ettekannet "Sõnum idast" Kiwa videot "Euro-Antivisioon. Kollase lipu all". D. Vilensky korraldatud illegaalsel posterite "näitusel" plankudel, kus Ida-Euroopa kunstnikud said avaldada arvamust Lääne kunstiinstitutsioonide strateegiate kohta, osalesid Aleksandr Brener, Oleg Kulik

  7. Vene saadik Rootsis - gaasitorust ja Birmast / Evelyn Höglund

    Index Scriptorium Estoniae

    Höglund, Evelyn

    2007-01-01

    Venemaa Rootsi suursaadiku Aleksandr Kadakini esinemisest Rootsi televisiooni populaarses telesaates, kus ta avaldas oma seisukohti Birma sündmuste, Vene-Saksa rajatava gaasijuhtme teemadel, samuti Rootsi meedia kohta. Vt. samas: Valitsust ei kritiseeri, küll aga meediat; Demokraatia on Venemaal olemas

  8. Pelevini ja Bulgakovi mängib üle Tšernobõl / Jaanus Piirsalu

    Index Scriptorium Estoniae

    Piirsalu, Jaanus, 1973-

    2011-01-01

    Venemaal ekraanile jõudnud Viktor Ginzburgi filmist "Generation "P"" ja Juri Kara filmist "Meister ja Margarita" (1994). Tšernobõli tuumajaama katastroofist rääkivast Aleksandr Mindadze filmist "Laupäeval". Peatselt valmib film Vladimir Võssotskist. Stsenaariumi on kirjutanud Nikita Võssotski

  9. Boris Akunin zombiroval Marinu Nejolovu, no... / Grigori Tshartishvili ; interv. Sergo Kuhianidze

    Index Scriptorium Estoniae

    Tshartishvili, Grigori

    2002-01-01

    Mängufilm "Azazel" : stsenarist oma romaani järgi Grigori Tshartishvili (pseudonüüm Boriss Akunin) : režissöör Aleksandr Adabashjan : Venemaa 2002. Romaani autor filmist ja selle ekraniseerimise käigust

  10. Bogohulnaja ballada : [luuletused] / Heiti Talvik ; lühibiograafia: S. S. [Svetlan Semenenko

    Index Scriptorium Estoniae

    Talvik, Heiti, 1904-1947

    1999-01-01

    Sisu: Bogohulnaja ballada ; Notsh ; Mõsli s pohmelja ; V etu ossen ; Trjassina 1 ; Kogda vsjo istsheznet... ; Osvobozhdenije / tlk. Svetlan Semenenko ; Posle revoljutsii 1-2 ; Hor rabov / tlk. Aleksandr Levin. Orig.: Blasfeemiline ballaad ; Öö ; Pohmeluslikke mõlgutusi ; Oli sügis ; Rabas 1 ; Kui mustavad udud ; Vabanemine ; Järel revolutsiooni 1-2 ; Orjade koor 1-2

  11. Hotel kak lutshshe, a... / Margarita Kornõsheva

    Index Scriptorium Estoniae

    Kornõsheva, Margarita, 1957-

    2006-01-01

    OÜ Amphenol Eesti tegevdirektor Aleksandr Antonov suunas seoses tellimuste vähesusega 50 töötajat ajutiselt tööle firmasse Elcoteq. Mitmed töötajatest leiavad, et direktor rikkus töölepingu seadust ja on pöördunud Töövaidluskomisjoni poole

  12. Golosa manezhnogo Peterburga / Galina Balashova

    Index Scriptorium Estoniae

    Balashova, Galina

    2004-01-01

    Peterburi kaasaegsest kunstist seoses kunstiteadlase Larissa Skobkina kureeritud näitusega Tallinna Vene saatkonna galeriis. Tutvustatakse underground-kunstnikke Anatoli Basinit, Vjatsheslav Mihhailovit, Valeri Lukkat, Vladimir Vidermani, Gleb Bogomolovit, Gennadi Ustjugovit, Natalja Zhilinat, rühmitust Mitki ja selle liikmeid Vladimir Shinkarjovi, Aleksandr Florenskit, Olga Florenskajat ning Peterburi fotokoolkonda esindavat Andrei Tshezhinit

  13. Ivan Groznõi vozvrashtshajetsja! / Jaroslav Shtshedrov

    Index Scriptorium Estoniae

    Shtshedrov, Jaroslav

    2008-01-01

    Vene režissöör Pavel Lungin koos operaator Tom Sterniga alustasid Suzdalis mängufilmi "Ivan Groznõi ja metrpoliit Filipp" võtteid. Osalevad Pjotr Mamonov (Ivan IV), Oleg Jankovski (Filipp), Ivan Ohlobõstin, Aleksandr Domogarov jt

  14. Arhitektuur pärast kommunismi : uus vene arhitektuur / Bart Goldhoorn

    Index Scriptorium Estoniae

    Goldhoorn, Bart

    2007-01-01

    Sissejuhatus Bart Goldhoorni raamatule "Capitalist Realism. New Architecture in Russia" (2007). Vene arhitektide osalemisest rahvusvahelistel võistlustel, linnauuendusest Nižni Novgorodis (peaarhitekt Aleksandr Haritonov), arhitektuurielust Moskvas, sisearhitektuurist, uuest arhitektide põlvkonnast, huvist välismaiste arhitektide vastu, vene arhitektuurist. Bibliograafia lk. 25

  15. "Nu, pogodi!" vozvrashtshajetsja / Tatjana Rostova

    Index Scriptorium Estoniae

    Rostova, Tatjana

    2005-01-01

    Populaarsele vene animafilmile "Oota sa!" ("Nu, pogodi!") valmis stuudios Christmas Films uus, 19. osa, mis tuleb ekraanile novembris. Filmi stsenarist on Aleksandr Kurljandski ja režissöör vana multifilmi tegija režissöör Vjatsheslav Kotjonotshkini poeg Aleksei

  16. Larissa Kaidalova : svobodnoje slovo / Larissa Kaidalova ; interv. Jelena Skulskaja

    Index Scriptorium Estoniae

    Kaidalova, Larissa

    2008-01-01

    Venemaa Teatrikunsti Akadeemia lavakõne õppejõud Larissa Kaidalova tuli Vene Teatrisse, et abistada näitlejaid Aleksandr Gribojedovi värsirütmi omandamisel. Lavastus "Häda mõistuse pärast" avab teatri juubelihooaja

  17. Russki Otello / Konstantin Artjuhhov ; interv. Nikolai Hrustaljov

    Index Scriptorium Estoniae

    Artjuhhov, Konstantin

    2002-01-01

    Vene režissöör Konstantin Artjuhhov vestleb Gatshina festivalil "Kirjandus ja kino" ajaloolise dokumentaalfilmist, lähemalt oma festivalil žürii eripreemia saanud filmist "Annibali imelik elu" ("Strannaja zhizn Annibala"). Film jutustab Aleksandr Pushkini vaarisast Abram Hannibalist (1696-1781), kelle elust suur osa möödus Eestis

  18. Kui ma oleksin rahvas... / Jürgen Rooste

    Index Scriptorium Estoniae

    Rooste, Jürgen, 1979-

    2007-01-01

    Anders Härmi kuraatorinäitus "Poliitiline/Poeetiline" Tallinna IV graafikatriennaali raames Tallinna Kunstihoones kuni 25. XI. Abel Abidini, Michael Baersi, Johansoni ja Johansoni, Jakob Koldingu, Teemu Mäki, Dan Perjovschi, Hanno Soansi ning Aleksandr Breneri & Barbara Schurzi töödest

  19. Alates 13. XII on Vaala galeriis avatud "Talvesalong"

    Index Scriptorium Estoniae

    2004-01-01

    Väljas on Ellinor Aiki, Valdur Ohaka, Herman Talviku, Jaak Arro, Raoul Kurvitza, Andres Toltsi, Laurentsiuse, Lembit Saartsi, Rait Rosina, Merike Estna, Maarit Murka ning Aleksandr Breneri ja Barbara Schurzi tööd. 17. XII Anna Litvinova, Ilmar Kruusamäe ja Lembit Sarapuu ühised maaliseansid

  20. Moskva pisaraid ei usu : 5. Venemaa rahvuslik teatrifestival "Zolotaja Maska" 10. märtsist 5. aprillini 1999 Moskvas / Juri Ljubimov, Kadi Herkül ; interv. Olga Jero

    Index Scriptorium Estoniae

    Ljubimov, Juri, 1917-2014

    1999-01-01

    Vaadeldakse lavastusi - A. Tshehhovi "Tatjana Repina" (lav. Valeri Fokin), W. Shakespeare'i "Talvemuinasjutt" (lav. Declan Donnellan), A. Ostrovski "Äike" (lav.Henrietta Janovskaja), A. Krutshjonõhhi "Võit päikese üle" (lav. Aleksandr Ponomarjov), W. Gombrowiczi "Iwona, Burgundia printsess" (lav. Oleg Rõbkin) ja H. Pinteri "Majahoidja" (lav. Juri Butussov)

  1. Алиса в Заэстонье / Николай Караев

    Index Scriptorium Estoniae

    Караев, Николай, 1978-

    2010-01-01

    „Alice" on omanäoline live perfomance, mis koosneb kaasaegsest koreograafiast, originaalsest autorimuusikast, kunstilisest videost, traditsioonilisest animatsioonist, VJ setist ja varjude teatrietendusest. Lavastuse autoriteks on MTÜ Fat Snail, MTÜ Vastik Sipsik, MTÜ HeliTelg, Olga Privis ja Aleksandr Žedeljov. Lavastus põhineb Lewis Carrolli teosel „Alice Imedemaal", kuid pole otseselt autori tekstide ümberjutustus

  2. Mõtteid raamatust / Koost. Heigi Aaviste

    Index Scriptorium Estoniae

    1995-01-01

    Aut.: Maire Liivamets, Paul Luhtein, Paul-Eerik Rummo, Maksim Gorki, Johannes Semper, R.Descartes, Valmar Adams, Lilli Promet, Paul Rummo, Cicero, Honoré de Balzac, Aleksandr Pushkin, Epikuros, Debora Vaarandi, Arvi Siig, Helene Johani, Juhan Smuul, Friedebert Tuglas

  3. Nash Shirvindt - babnik! / Oksana Truhhan

    Index Scriptorium Estoniae

    Truhhan, Oksana

    2005-01-01

    Komöödiafilm "Naistemees" ("Babnik") : stsenarist ja režissöör Anatoli Eiramdzhan : osades Aleksandr Shirvindt, Mihhail Derzhavin, Irina Muravjova : NSV Liit 1990. Režissöör ja näitlejad meenutavad filmivõtteid

  4. Nevozvrashtshentsõ / Aleksei Andrejev, Irina Baramidze

    Index Scriptorium Estoniae

    Andrejev, Aleksei

    2007-01-01

    Välisriikidest Venemaale ümberasumiseks on soovi avaldanud vaid 20 000 inimest. Autorite väitel pole Vene riik loonud peaaegu mingeid tingimusi inimeste tagasitulekuks oma ajaloolisele kodumaale. Ümberasujatele ettenähtud toetustest. Vt. samas Aleksandr Minejevi, Zhanna Zahharova ja Rafael Mustafajevi artiklid

  5. A Russian View on Landpower

    Science.gov (United States)

    2015-04-01

    the current state of intense information warfare waged by Russia over events in Ukraine, but the language is borrowed from Russia’s Information... Nordic Defense Cooperation and European Security,” forthcoming publication. 17 DEVELOPMENT PROSPECTS FOR LAND FORCES Major General Aleksandr V. Rogovoy

  6. Drama Russkogo teatra : posledni akt / Jaanus Kukk, Jevgeni Golikov ; interv. Boris Tuch

    Index Scriptorium Estoniae

    Kukk, Jaanus

    2008-01-01

    Vene Teatri kunstiline juht Mihhail Tshumatshenko lahkus ametist. Vene teatri olukorrast räägivad ja avaldavad oma arvamust ka Aivar Mägi, Jaak Allik, Laine Jänes, Artjom Garejev, Aleksandr Ivashkevitsh, Julia Jablonskaja. Lühendatult on avaldatud Ugala teatri lavastaja Peeter Tammearu avalik pöördumine

  7. Vanalinna Hariduskolleegiumi Gümnaasiumi õppehoone restaureerimine = Restoration of the academic building of the Old Town Educational College / Margit Mutso

    Index Scriptorium Estoniae

    Mutso, Margit, 1966-

    2009-01-01

    Tallinnas Vene 22 asuva hoone muinsuskaitse eritingimused koostas Aleksandr Pantelejev. Arhitekt Marie Hammer, sisearhitekt Tiiu Lõhmus (Vana Tallinn), arheoloog Villu Kadakas ja muinsuskaitselist järelevalvet teostanud Helve Ilves pälvisid restaureerimistöö eest arhitektuuri sihtkapitali aastapreemia 2008. Žürii hinnang

  8. Kreml võttis ette järjekordse lääne energiakompanii / Krister Paris

    Index Scriptorium Estoniae

    Paris, Krister, 1977-

    2008-01-01

    Venemaal vahistati Briti kodanikud Ilja ja Aleksandr Zaslavski, FSB väitel kogusid nad ebaseaduslikult infot välismaiste nafta- ja gaasikompaniide jaoks. Korraldati läbiotsimine ettevõtetes BP ja TNK-BP, kus FSB väitel leiti spionaazhile viitavaid asitõendeid. Vaatlejate arvamusi

  9. Артисты рассказали о "Дяде Ване" / Ксения Репсон

    Index Scriptorium Estoniae

    Репсон, Ксения

    2009-01-01

    Mossoveti Akadeemilise Teatri näitlejad Pavel Derevjanko, Irina Kartaševa, Julia Võssotskaja ja Aleksandr Filippenko räägivad, kuidas kulges töö Andrei Kontšalovski lavastusega "Onu Vanja", mida näidati algul Itaalias ja nüüd Eestis

  10. Sneg v bambukovoi roshtshe... / Irina Butjajeva

    Index Scriptorium Estoniae

    Butjajeva, Irina

    2007-01-01

    Kohtla-Järve Kunstnike Ühenduse näitus "Pidulik palett" Tallinna galeriis Aatrium. Kommenteerib ühenduse esimees Aarne Hanni. Osaleb 16 kunstnikku: Aleksandr Igonin, Ljudmilla Beljajeva, Oleg Jatsenko, Sergei Jatsenko, Svetlana Petrova, Arkadi Jartsev, Gennadi Jeltsov, Aarne Hanni, Arvo Aun, Tamara Breideks ja teised

  11. Peeter I moorlasest vändatakse dokfilm / Tambet Kaugema

    Index Scriptorium Estoniae

    Kaugema, Tambet

    2001-01-01

    Eestis filmiti osa vene režissööri Konstantin Artjuhhovi sügisel valmivast dokumentaalfilmist "Minu Aafrika taeva all". Film jutustab Aleksandr Pushkini vaarisast Abram Hannibalist (1696-1781), kelle elust suur osa möödus Eestis

  12. Vene teatri eliit Eestisse / Jaak Allik

    Index Scriptorium Estoniae

    Allik, Jaak, 1946-

    2009-01-01

    Venemaa teatrifestivalist "Kuldne mask", pikemalt sügisel 6.-13. okt. Eestis mängitavatest lavastustest - Alvis Hermanise "Šukšini lood" Jevgeni Mironoviga peaosas, Aleksandr Ostrovski "Äike" Lev Erenburgi lavastuses, "Onukese unenägu" Oleg Basilašviliga peaosas ja William Shakespeare'i "Kaheteistkümnes öö" Declan Donnellani lavastuses

  13. Grybauskaite's historic visit to Belarus / Rokas M. Tracevskis

    Index Scriptorium Estoniae

    Tracevskis, Rokas M.

    2010-01-01

    Minskis toimunud presidentide Dalia Grybauskaite ja Aleksandr Lukašenko kohtumisel räägiti 19. detsembril toimuvatest Valgevene presidendivalimistest ja idapartnerlusest. Leedu president kohtus ka opositsiooni liikmetega. Visiidi ajal allkirjastasid riikide välisministrid Audronius Azubalis ja Sergei Martõnov lepingu, mis lihtsustab kahe riigi piiriäärsete elanike piiriületust

  14. Cintilações de neutro nas imagens de mãe e filho

    Directory of Open Access Journals (Sweden)

    Rosana Cacciatore Silveira

    2007-01-01

    Full Text Available The present essay discusses Mãe e filho (Mother and son — 1997, a film by Aleksandr Sokurov, a contemporary Russian film director, which argument is the mother’s death. I approach the film, through the Barthesian concept of neuter dialoguing with other concepts, as image-affection, in Deleuze, and Interface, in Ranciére.

  15. Korterelamud Haapsalus : Kastani 28 ja 36 = Apartment buildings in Haapsalu : Kastani 28 and 36 / Liina Jänes

    Index Scriptorium Estoniae

    Jänes, Liina, 1977-

    2008-01-01

    Nõukogude ajal lõpetamata jäänud majakarpide ümberehitus. Arhitektid: Urmas Muru, Peeter Pere, ksaasa töötasid Reet Viigipuu, Berit Freivald, Doris Orasi ja Aleksandr Zverev. Peatöövõtja: Mapri Projekt OÜ. 2 põhiplaani, 2 värv. välisvaadet

  16. В кривом зеркале : беседа с собирателем-исследователем Ренэ Герра о судьбах русских писателей-эмигрантов второй волны / интервьюировала

    Index Scriptorium Estoniae

    Герра, Ренэ, 1946-

    2015-01-01

    Poleemika Vladimir Agenossovi koostatud "teise laine" emigrantidele pühendatud antoloogiaga "Восставшие из небытия" (Peterburi, 2014), Gerra vaidlustab Juri Ivaski, Igor Tšinnovi, Boriss Nartsissovi, Aleksandr Perfiljevi ja Irina Saburova kaasamise "teise laine" antoloogiasse, pidades neid "esimese laine" emigrantideks

  17. Magnetic resonance arthrography in chronic wrist pain

    International Nuclear Information System (INIS)

    Valeri, G.; Ferrara, C.; Carloni, S.

    1999-01-01

    The purpose of this paper is to investigate the clinical role of Magnetic Resonance Arthrography (MRA) of the wrist in subjects with chronic pain. Thirty-five patients complaining of wrist pain for more than 6 months were submitted to MRI an MRA. All patients received and intra-articular injection of 2-10 mL of a 10 mmol saline solution of Gd-DPTA. The overall diagnostic accuracy rates of MRI and MRA were 40% and 81% respectively, with sensitivity and specificity of 63% and 39% (MRI) and of 82% and 79% (MRA). The conclusion is that compared with MRI, MRA can be considered a useful tool for the visualization of interosseus carpal ligaments and of the triangular fibrocartilage complex. MRA also helps detect injuries in these structures [it

  18. MR angiography of in situ and transplanted renal arteries

    International Nuclear Information System (INIS)

    Smith, H.J.; Bakke, S.J.

    1993-01-01

    Three-dimensional (3D) time-of-flight (TOF) MR angiography (MRA) was performed in 34 patients with suspected renal artery disease. In situ (i.e., nontransplanted) renal arteries were studied with MRA in 14 patients. Of these, 12 had conventional angiography for comparison. Twenty-four MRAs of transplanted renal arteries were obtained in 20 patients; 8 of these had angiography as well. Significant stenoses of in situ renal arteries were diagnosed with a sensitivity of 100% and a specificity of 95%. The stenoses were all proximal; 3D TOF MRA proved inadequate for depiction of peripheral renal arteries. MRA and angiography showed good agreement between findings in 7 of 8 patients with renal transplants. In one patient with a renal transplant, MRA showed a significant stenosis of the arterial anastomosis which appeared completely normal at i.a. DSA, indicating that findings at MRA still need to be confirmed by more established alternative methods. (orig.)

  19. Magnetic resonance arthrography in chronic wrist pain. Artografia con Risonanza Magnetica (arto-RM) nelle malattie dolorose croniche del polso

    Energy Technology Data Exchange (ETDEWEB)

    Valeri, G.; Ferrara, C. (Ancona Univ. (Italy). Cattedra di Radiologia); Carloni, S. (Ancona Univ. (Italy). Cattedra di Ortopedia) (and others)

    The purpose of this paper is to investigate the clinical role of Magnetic Resonance Arthrography (MRA) of the wrist in subjects with chronic pain. Thirty-five patients complaining of wrist pain for more than 6 months were submitted to MRI an MRA. All patients received and intra-articular injection of 2-10 mL of a 10 mmol saline solution of Gd-DPTA. The overall diagnostic accuracy rates of MRI and MRA were 40% and 81% respectively, with sensitivity and specificity of 63% and 39% (MRI) and of 82% and 79% (MRA). The conclusion is that compared with MRI, MRA can be considered a useful tool for the visualization of interosseus carpal ligaments and of the triangular fibrocartilage complex. MRA also helps detect injuries in these structures.

  20. Three-dimensional black blood MR angiography of the liver during breath holding. A comparison with two-dimensional time-of-flight MR angiography

    International Nuclear Information System (INIS)

    Suto, Y.; Ohuchi, Y.; Kimura, T.; Shirakawa, T.; Mizuuchi, N.; Takizawa, O.; Yamane, T.; Kamba, M.; Moriyama, S.; Ohta, Y.

    1994-01-01

    In 2-D time-of-flight MR angiography (2-D TOF MRA) of the liver, artifacts caused by respiratory motion are unavoidable. Therefore, a 3-D black blood MRA of the liver was attempted in 7 healthy volunteers, using a 3-D gradient echo sequence which allows imaging during breath holding. 2-D TOF MRA was performed as well. In all subjects, 3-D MRA allowed visualization of the trunk, 1st-, and 2nd-order branches of the portal vein without interruption. Right 3rd-order branches were visualized without interruption in 6 of 7 subjects (85%). However, with 2-D MRA, the transverse portion of the left main portal vein could not be visualized in any subject, and the periphery of the portal vein was less clear than with 3-D MRA. (orig.)

  1. The value of MR angiography in the diagnosis of deep vein thrombosis of the lower limbs: comparative study with DSA

    International Nuclear Information System (INIS)

    Feng Min; Wang Shuzhi; Gu Jianping; Sun Jun; Mao Cunnan; Lu Lingquan; Yin Xindao

    2007-01-01

    Objective: To assess the clinical values of MR angiography (MRA) in the detection of deep vein thrombosis of the lower limbs. Methods: Two-dimensional time of flight (2D TOF) MRA was performed in thirty patients who were suspected of having deep vein thrombosis in the lower limbs. The findings of MRA were compared to that of digital subtraction angiography (DSA). Results: twenty-five cases showed deep vein thrombosis in the lower limbs, the MRA findings included venous filling defect (14 cases), occlusions and interruptions of veins (8 cases), venous recanalizations (3 cases), collateral veins (25 cases). Taking the results of DSA as a golden standard, MRA detected all of the affected cases with only one case as the false positive. Conclusion: 2D TOF MRA is a method of choice in the diagnosis of deep vein thrombosis of the lower limbs. (authors)

  2. Prospective comparison of MR angiography and color duplex US with conventional angiography for peripheral arterial occlusive disease

    International Nuclear Information System (INIS)

    Mulligan, S.A.; Matsuda, T.; Lanzer, P.; Gross, G.; Routh, W.; Keller, F.; Koslin, D.B.; Berland, L.; Fields, M.; Doyle, M.; Cranney, G.; Lee, J.; Pohost, G.

    1990-01-01

    This paper evaluates color Doppler US (CDUS) and MR angiographic (MRA) assessment of peripheral vascular disease of the lower extremities, using blinded prospective comparison with conventional angiography. Conventional angiography, two-dimensional inflow MRA, and CDUS were performed in 12 patients. Four diagnostic categories were used to grade arterial lesions by evaluating peak velocity. Revascularization interventions were planned by the vascular surgeon, blinded from the imaging method utilized and from data derived from CDUS, MRA, and conventional angiography

  3. Non-contrast-enhanced MR angiography in critical limb ischemia: performance of quiescent-interval single-shot (QISS) and TSE-based subtraction techniques

    Energy Technology Data Exchange (ETDEWEB)

    Altaha, Mustafa A. [University Health Network, Department of Medical Imaging, Peter Munk Cardiac Centre, Toronto, Ontario (Canada); Jaskolka, Jeffrey D.; Tan, Kongteng; Menezes, Ravi J. [University Health Network, Department of Medical Imaging, Peter Munk Cardiac Centre, Toronto, Ontario (Canada); University of Toronto, Department of Medical Imaging, Toronto, Ontario (Canada); Rick, Manuela; Schmitt, Peter [Siemens Healthcare, Erlangen (Germany); Wintersperger, Bernd J. [University Health Network, Department of Medical Imaging, Peter Munk Cardiac Centre, Toronto, Ontario (Canada); University of Toronto, Department of Medical Imaging, Toronto, Ontario (Canada); Toronto General Hospital, Department of Medical Imaging, Toronto, Ontario (Canada)

    2017-03-15

    The aim of this study was to evaluate diagnostic performance of non-contrast-enhanced 2D quiescent-interval single-shot (QISS) and 3D turbo spin-echo (TSE)-based subtraction magnetic resonance angiography (MRA) in the assessment of peripheral arteries in patients with critical limb ischemia (CLI). Nineteen consecutive patients (74 % male, 72.8 ± 9.9 years) with CLI underwent 2D QISS and 3D TSE-based subtraction MRA at 1.5 T. Axial-overlapping QISS MRA (3 mm/2 mm; 1 x 1 mm{sup 2}) covered from the toes to the aortic bifurcation while coronal 3D TSE-based subtraction MRA (1.3 x 1.2 x 1.3 mm{sup 3}) was restricted to the calf only. MRA data sets (two readers) were evaluated for stenosis (≥50 %) and image quality. Results were compared with digital subtraction angiography (DSA). Two hundred and sixty-seven (267) segments were available for MRA-DSA comparison, with a prevalence of stenosis ≥50 % of 41.9 %. QISS MRA was rated as good to excellent in 79.5-96.0 % of segments without any nondiagnostic segments; 89.8-96.1 % of segments in 3D TSE-based subtraction MRA were rated as nondiagnostic or poor. QISS MRA sensitivities and specificities (segmental) were 92 % and 95 %, respectively, for reader one and 81-97 % for reader two. Due to poor image quality of 3D TSE-based subtraction MRA, diagnostic performance measures were not calculated. QISS MRA demonstrates excellent diagnostic performance and higher robustness than 3D TSE-based subtraction MRA in the challenging patient population with CLI. (orig.)

  4. State of the science: does the theory of maternal role attainment apply to African American motherhood?

    Science.gov (United States)

    Fouquier, Katherine Ferrell

    2013-01-01

    This article reviews the current state of knowledge of the theory of maternal role attainment (MRA) and its relevance in describing African American motherhood. EBSCOhost Research Databases that included PubMed, CINAHL plus, MEDLINE, PsycINFO, SCOPUS, and Web of Science were searched for journal articles that examined maternal identity and MRA. Keyword searches included maternal identity, maternal role attainment, becoming a mother, prenatal attachment, maternal-fetal attachment, and maternal-infant attachment. Inclusion criteria for this review were published journal articles of studies conducted in the United States, with a clear delineation of the theoretical framework of MRA. Journal articles that measured MRA among women with depression or medically fragile infants were excluded. Two hundred and twelve studies were reviewed; 25 studies, published between 1975 and 2007, met the inclusion criteria. Nine articles described the theory of MRA, 11 articles measured variables thought to influence MRA, and 6 articles described maternal-fetal attachment, a construct of MRA. Studies were reviewed, categorized, and analyzed to determine current knowledge of how the theory of MRA describes African American motherhood. Categories included studies describing the theoretical framework of maternal identity and MRA, studies measuring key variables thought to impact MRA, and studies measuring maternal-fetal attachment and maternal-infant attachment. The studies were limited by homogenous samples of upper-middle-class white women and low-income, single, African American adolescents. Study results of MRA cannot be generalized to African American women. Further research is essential to identify attributes influencing MRA, specifically among larger samples of African American women with demographics similar to that of the white populations that have been included in studies thus far. © 2013 by the American College of Nurse-Midwives.

  5. Non-contrast-enhanced MR angiography in critical limb ischemia: performance of quiescent-interval single-shot (QISS) and TSE-based subtraction techniques

    International Nuclear Information System (INIS)

    Altaha, Mustafa A.; Jaskolka, Jeffrey D.; Tan, Kongteng; Menezes, Ravi J.; Rick, Manuela; Schmitt, Peter; Wintersperger, Bernd J.

    2017-01-01

    The aim of this study was to evaluate diagnostic performance of non-contrast-enhanced 2D quiescent-interval single-shot (QISS) and 3D turbo spin-echo (TSE)-based subtraction magnetic resonance angiography (MRA) in the assessment of peripheral arteries in patients with critical limb ischemia (CLI). Nineteen consecutive patients (74 % male, 72.8 ± 9.9 years) with CLI underwent 2D QISS and 3D TSE-based subtraction MRA at 1.5 T. Axial-overlapping QISS MRA (3 mm/2 mm; 1 x 1 mm 2 ) covered from the toes to the aortic bifurcation while coronal 3D TSE-based subtraction MRA (1.3 x 1.2 x 1.3 mm 3 ) was restricted to the calf only. MRA data sets (two readers) were evaluated for stenosis (≥50 %) and image quality. Results were compared with digital subtraction angiography (DSA). Two hundred and sixty-seven (267) segments were available for MRA-DSA comparison, with a prevalence of stenosis ≥50 % of 41.9 %. QISS MRA was rated as good to excellent in 79.5-96.0 % of segments without any nondiagnostic segments; 89.8-96.1 % of segments in 3D TSE-based subtraction MRA were rated as nondiagnostic or poor. QISS MRA sensitivities and specificities (segmental) were 92 % and 95 %, respectively, for reader one and 81-97 % for reader two. Due to poor image quality of 3D TSE-based subtraction MRA, diagnostic performance measures were not calculated. QISS MRA demonstrates excellent diagnostic performance and higher robustness than 3D TSE-based subtraction MRA in the challenging patient population with CLI. (orig.)

  6. Comparison of MR angiography with conventional angiography in cervical and intracranial vascular disease

    International Nuclear Information System (INIS)

    Choi, D. S.; Chang, K. H.; Jung, H. W.; Han, M. H.

    1995-01-01

    To assess the usefulness of magnetic resonance angiography (MRA) in evaluation of stenosis of carotid and large cerebral vessels and cerebral aneurysm. Twenty-seven patients with either arterial stenosis in cervical or intracranial major vessels (n = 18) or cerebral aneurysm (n = 8) or both (n 1) were examined with both MRA and conventional angiography (CA). MRA was performed with 3D TOF technique with magnetization transfer suppression at 1.5T system (Magnetom, Siemens, Germany); both intracranial MRA and cervical MRA in 16 patients, intracranial MRA only in the remaining patients. For evaluation of arterial stenosis, 32 carotid bifurcations and 383 segments of intracranial major vessels were assessed in blind fashion, and were compared with those of CA. Each arterial segment was arbitrarily classified into one of five grades (< 10, 10-49, 50-74, 75-99, 100%) for carotid bifurcation and one of four (< 10, 10-49, 50-99, 100%) for intracranial vessels. For aneurysm, its location, size shape and direction were compared. For arterial stenosis, concordance rate between MRA and CA was 88% (28/32) in carotid bifurcation and 89% (340/383) in intracranial vessels. All discordant cases were overgraded on MRA. For aneurysm, 7 of 9 were demonstrated on both MRA and CA, one of which was partially demonstrated on MRA. One of the other two patients showed aneurysm only on MRA, whereas the remaining one revealed aneurysm only on CA. MRA may be performed as a screening test for occlusive disease of cervical and major intracranial vessels and cerebral aneurysm

  7. Gadolinium-enhanced MR angiography of the thoracoabdominal aorta diseases

    International Nuclear Information System (INIS)

    D'Ippolito, Giuseppe; Wolosker, Nelson; Galvao Filho, Mario; Kalil, Jorge A.; Wolosker, Angela; Borri, Maria Lucia

    1998-01-01

    Gadolinium-enhanced MR angiography (GEMRA) of the thoracoabdominal aorta is a noninvasive technique that can rapidly delineate the branch vessels diseases, without flow or respiration artifacts, obtained with non contrast MRA. The objective of this paper is to show the main clinical applications of GEMRA, compared to non contrast sequences. We have evaluated 30 patients with thorocoabdominal aorta diseases. These patients have been examined with GEMRA (3D, FFE sequences) obtained after 30 mlIV contrast injection and non contrast MRA (2D-TOF sequences). In our experience, gadolinium-enhanced MRA is a high resolution and speedy technique with advantages over non contrast MRA. (author)

  8. Nonenhanced MR angiography techniques

    International Nuclear Information System (INIS)

    Lanzman, R.S.; Kroepil, P.; Blondin, D.; Schmitt, P.

    2011-01-01

    Especially in regard to the potential risks for the development of nephrogenic systemic fibrosis (NSF) following the administration of Gadolinium-based contrast material, nonenhanced MR angiography (MRA) methods are becoming ever more important. Besides well-established time-of-flight (TOF) and phase-contrast (PC) MRA, alternative imaging techniques based on balanced steady-state free precession (bSSFP) and turbo-spin-echo (TSE) sequences are increasingly used in combination with or without arterial spin labeling (ASL) strategies. This article provides an overview of the principles and clinical values of different nonenhanced MRA techniques. In addition, recent nonenhanced MRA developments are presented. (orig.)

  9. Comparison of Power Versus Manual Injection in Bolus Shape and Image Quality on Contrast-Enhanced Magnetic Resonance Angiography: An Experimental Study in a Swine Model.

    Science.gov (United States)

    Tsuboyama, Takahiro; Jost, Gregor; Pietsch, Hubertus; Tomiyama, Noriyuki

    2017-09-01

    The aim of this study was to compare power versus manual injection in bolus shape and image quality on contrast-enhanced magnetic resonance angiography (CE-MRA). Three types of CE-MRA (head-neck 3-dimensional [3D] MRA with a test-bolus technique, thoracic-abdominal 3D MRA with a bolus-tracking technique, and thoracic-abdominal time-resolved 4-dimensional [4D] MRA) were performed after power and manual injection of gadobutrol (0.1 mmol/kg) at 2 mL/s in 12 pigs (6 sets of power and manual injections for each type of CE-MRA). For the quantitative analysis, the signal-to-noise ratio was measured on ascending aorta, descending aorta, brachiocephalic trunk, common carotid artery, and external carotid artery on the 6 sets of head-neck 3D MRA, and on ascending aorta, descending aorta, brachiocephalic trunk, abdominal aorta, celiac trunk, and renal artery on the 6 sets of thoracic-abdominal 3D MRA. Bolus shapes were evaluated on the 6 sets each of test-bolus scans and 4D MRA. For the qualitative analysis, arterial enhancement, superimposition of nontargeted enhancement, and overall image quality were evaluated on 3D MRA. Visibility of bolus transition was assessed on 4D MRA. Intraindividual comparison between power and manual injection was made by paired t test, Wilcoxon rank sum test, and analysis of variance by ranks. Signal-to-noise ratio on 3D MRA was statistically higher with power injection than with manual injection (P < 0.001). Bolus shapes (test-bolus, 4D MRA) were represented by a characteristic standard bolus curve (sharp first-pass peak followed by a gentle recirculation peak) in all the 12 scans with power injection, but only in 1 of the 12 scans with manual injection. Standard deviations of time-to-peak enhancement were smaller in power injection than in manual injection. Qualitatively, although both injection methods achieved diagnostic quality on 3D MRA, power injection exhibited significantly higher image quality than manual injection (P = 0.001) due to

  10. Association of Lumbar Arterial Stenosis with Low Back Symptoms: A Cross-Sectional Study Using Two-Dimensional Time-of-Flight Magnetic Resonance Angiography

    International Nuclear Information System (INIS)

    Korkiakoski, A.; Niinimaeki, J.; Karppinen, J.; Korpelainen, R.; Haapea, M.; Natri, A.; Tervonen, O.

    2009-01-01

    Background: Recent studies indicate that diminished blood flow may cause low back symptoms and intervertebral disc degeneration. Purpose: To explore the association between lumbar arterial stenosis as detected by two-dimensional time-of-flight magnetic resonance angiography (2D TOF-MRA) and lumbar pain symptoms in an occupational cohort of middle-aged Finnish males. Material and Methods: 228 male subjects aged 36 to 55 years (mean 47 years) were imaged with 2D TOF-MRA. Additionally, 20 randomly selected subjects were scanned with contrast-enhanced MRA (ceMRA). In each subject, the first (L1) to fourth (L4) segmental lumbar arteries were evaluated for lumbar artery stenosis using a dichotomic scale. One subject was excluded because of poor image quality, reducing the study population to 227 subjects. Logistic regression analysis was used to evaluate the association between arterial stenosis in 2D TOF-MRA and low back pain and sciatica symptoms (intensity, duration, frequency). Results: Comparing 2D TOF-MRA and ceMRA images, the kappa value (95% confidence interval) was 0.52 (0.31-0.73). The intraobserver reliability kappa value for 2D TOF-MRA was 0.85 (0.77-0.92), and interobserver kappa was 0.57 (0.49-0.65). The sensitivity of 2D TOF-MRA in detecting stenosis was 0.58, the accuracy 0.89, and the specificity 0.94. In 97 (43%) subjects all arteries were normal, whereas 130 (57%) had at least one stenosed artery. The left L4 artery was most often affected. The degree of arterial stenosis was associated with intensity of low back and sciatic pain, and sciatica pain duration during the past 3 months. Conclusion: 2D TOF-MRA is an acceptable imaging method for arterial stenosis compared to ceMRA. Arterial stenosis was associated with subjective pain symptoms, indicating a role of decreased nutrition in spinal disorders

  11. Association of Lumbar Arterial Stenosis with Low Back Symptoms: A Cross-Sectional Study Using Two-Dimensional Time-of-Flight Magnetic Resonance Angiography

    Energy Technology Data Exchange (ETDEWEB)

    Korkiakoski, A.; Niinimaeki, J.; Karppinen, J.; Korpelainen, R.; Haapea, M.; Natri, A.; Tervonen, O. (Inst. of Clinical Sciences, Dept. of Physical and Rehabilitation Medicine, Univ. of Oulu, Oulu (Finland))

    2009-01-15

    Background: Recent studies indicate that diminished blood flow may cause low back symptoms and intervertebral disc degeneration. Purpose: To explore the association between lumbar arterial stenosis as detected by two-dimensional time-of-flight magnetic resonance angiography (2D TOF-MRA) and lumbar pain symptoms in an occupational cohort of middle-aged Finnish males. Material and Methods: 228 male subjects aged 36 to 55 years (mean 47 years) were imaged with 2D TOF-MRA. Additionally, 20 randomly selected subjects were scanned with contrast-enhanced MRA (ceMRA). In each subject, the first (L1) to fourth (L4) segmental lumbar arteries were evaluated for lumbar artery stenosis using a dichotomic scale. One subject was excluded because of poor image quality, reducing the study population to 227 subjects. Logistic regression analysis was used to evaluate the association between arterial stenosis in 2D TOF-MRA and low back pain and sciatica symptoms (intensity, duration, frequency). Results: Comparing 2D TOF-MRA and ceMRA images, the kappa value (95% confidence interval) was 0.52 (0.31-0.73). The intraobserver reliability kappa value for 2D TOF-MRA was 0.85 (0.77-0.92), and interobserver kappa was 0.57 (0.49-0.65). The sensitivity of 2D TOF-MRA in detecting stenosis was 0.58, the accuracy 0.89, and the specificity 0.94. In 97 (43%) subjects all arteries were normal, whereas 130 (57%) had at least one stenosed artery. The left L4 artery was most often affected. The degree of arterial stenosis was associated with intensity of low back and sciatic pain, and sciatica pain duration during the past 3 months. Conclusion: 2D TOF-MRA is an acceptable imaging method for arterial stenosis compared to ceMRA. Arterial stenosis was associated with subjective pain symptoms, indicating a role of decreased nutrition in spinal disorders

  12. Does Marketing Attract Less Ethical Students? An Assessment of the Moral Reasoning Ability of Undergraduate Marketing Students

    Science.gov (United States)

    Herington, Carmel; Weaven, Scott

    2007-01-01

    This article assesses the level of moral reasoning ability (MRA) of undergraduate marketing students and compares the results with the MRA of students in a range of other business disciplines. The aim was to determine if marketing attracts individuals who have a greater predisposition to unethical behaviors given that marketing is often reported…

  13. Magnetic resonance angiography in suspected cerebral vasculitis

    International Nuclear Information System (INIS)

    Demaerel, Philippe; De Ruyter, Nele; Wilms, Guido; Maes, Frederik; Velghe, Beatrijs

    2004-01-01

    The purpose of this study was to determine the technical capacity and diagnostic accuracy of 3D time-of-flight magnetic resonance angiography (MRA) in suspected cerebral vasculitis in a retrospective analysis of MRA and digital subtraction angiography (DSA) in 14 young patients with clinical and/or radiological suspicion of cerebral vasculitis. A total of nine arteries were evaluated in each patient. Consensus review of DSA by three observers was the reference standard. The sensitivity for detecting a stenosis varied from 62 to 79% for MRA and from 76 to 94% for DSA, depending on the observer. The specificity for detecting a stenosis varied from 83 to 87% for MRA and from 83 to 97% for DSA. Using the criterion ''more than two stenoses in at least two separate vascular distributions'' to consider the examination as being true positive, the false-positive rates for MRA and DSA were comparable. MRA plays a role as the first angiographical examination in the diagnostic work-up of suspected cerebral vasculitis. When more than two stenoses in at least two separate vascular distributions are depicted on MRA, DSA is not expected to add a significant diagnostic contribution in a patient with suspected cerebral vasculitis. DSA remains necessary when MRA is normal or when less than three stenoses are seen. (orig.)

  14. Prospective study comparing three-dimensional computed tomography and magnetic resonance imaging for evaluating the renal vascular anatomy in potential living renal donors.

    Science.gov (United States)

    Bhatti, Aftab A; Chugtai, Aamir; Haslam, Philip; Talbot, David; Rix, David A; Soomro, Naeem A

    2005-11-01

    To prospectively compare the accuracy of multislice spiral computed tomographic angiography (CTA) and magnetic resonance angiography (MRA) in evaluating the renal vascular anatomy in potential living renal donors. Thirty-one donors underwent multislice spiral CTA and gadolinium-enhanced MRA. In addition to axial images, multiplanar reconstruction and maximum intensity projections were used to display the renal vascular anatomy. Twenty-four donors had a left laparoscopic donor nephrectomy (LDN), whereas seven had right open donor nephrectomy (ODN); LDN was only considered if the renal vascular anatomy was favourable on the left. CTA and MRA images were analysed by two radiologists independently. The radiological and surgical findings were correlated after the surgery. CTA showed 33 arteries and 32 veins (100% sensitivity) whereas MRA showed 32 arteries and 31 veins (97% sensitivity). CTA detected all five accessory renal arteries whereas MRA only detected one. CTA also identified all three accessory renal veins whereas MRA identified two. CTA had a sensitivity of 97% and 47% for left lumbar and left gonadal veins, whereas MRA had a sensitivity of 74% and 46%, respectively. Multislice spiral CTA with three-dimensional reconstruction was more accurate than MRA for both renal arterial and venous anatomy.

  15. Radiosurgery for arteriovenous malformations based on magnetic resonance angiography

    International Nuclear Information System (INIS)

    Mehta, Minesh; Kubsad, Shrikant; Petereit, Daniel; Turski, Patrick; Levin, Allan; Kinsella, Timothy

    1993-01-01

    Magnetic Resonance Angiography (MRA) was performed to establish its feasibility, compare it with standard angiography (SA), employ MRA in follow-up and semiquantify AVM flow velocity (FV). A correlative evaluation between flow velocity and response to stereotactic radiosurgery was also attempted. (author). 8 refs., 1 tab

  16. 3D printing of intracranial artery stenosis based on the source images of magnetic resonance angiograph.

    Science.gov (United States)

    Xu, Wei-Hai; Liu, Jia; Li, Ming-Li; Sun, Zhao-Yong; Chen, Jie; Wu, Jian-Huang

    2014-08-01

    Three dimensional (3D) printing techniques for brain diseases have not been widely studied. We attempted to 'print' the segments of intracranial arteries based on magnetic resonance imaging. Three dimensional magnetic resonance angiography (MRA) was performed on two patients with middle cerebral artery (MCA) stenosis. Using scale-adaptive vascular modeling, 3D vascular models were constructed from the MRA source images. The magnified (ten times) regions of interest (ROI) of the stenotic segments were selected and fabricated by a 3D printer with a resolution of 30 µm. A survey to 8 clinicians was performed to evaluate the accuracy of 3D printing results as compared with MRA findings (4 grades, grade 1: consistent with MRA and provide additional visual information; grade 2: consistent with MRA; grade 3: not consistent with MRA; grade 4: not consistent with MRA and provide probable misleading information). If a 3D printing vessel segment was ideally matched to the MRA findings (grade 2 or 1), a successful 3D printing was defined. Seven responders marked "grade 1" to 3D printing results, while one marked "grade 4". Therefore, 87.5% of the clinicians considered the 3D printing were successful. Our pilot study confirms the feasibility of using 3D printing technique in the research field of intracranial artery diseases. Further investigations are warranted to optimize this technique and translate it into clinical practice.

  17. Conventional digital subtraction x-ray angiography versus magnetic resonance angiography in the evaluation of carotid disease: patient satisfaction and preferences

    Energy Technology Data Exchange (ETDEWEB)

    U-King-Im, J.M. E-mail: jhg21@cam.ac.uk; Trivedi, R.; Cross, J.; Higgins, N.; Graves, M.; Kirkpatrick, P.; Antoun, N.; Gillard, J.H

    2004-04-01

    AIM: To compare conventional digital subtraction x-ray angiography (DSA) and contrast-enhanced magnetic resonance angiography (MRA) of the carotid arteries in terms of patient satisfaction and preferences. METHODS: One hundred and sixty-seven patients with symptomatic carotid artery disease, who underwent both DSA and MRA, were prospectively recruited in this study. Patients' perceptions of each method were assessed by the use of a questionnaire after each procedure. Main outcome measures were anxiety, pain, satisfaction rate and patient preferences. RESULTS: DSA generated more anxiety and pain during the procedure, but the severity of these ill-effects was mild. Satisfaction rates for each method were similar. More patients were, however, willing to have a repeat MRA compared with DSA (67 versus 41%). The majority of patients (62%) preferred MRA over DSA (31%). The shorter MRA imaging time was found to be a significant factor in patients' acceptance of the technique. The main reasons cited by patients for their dislike of a particular procedure was noise and claustrophobia for MRA and invasiveness, pain and post-procedural bed rest for DSA. CONCLUSIONS: MRA is the method that is preferred by the majority of patients, although the actual disutility of DSA may be small. Assuming equal diagnostic accuracy, our data supports replacement of DSA by MRA for routine carotid imaging.

  18. Conventional digital subtraction x-ray angiography versus magnetic resonance angiography in the evaluation of carotid disease: patient satisfaction and preferences

    International Nuclear Information System (INIS)

    U-King-Im, J.M.; Trivedi, R.; Cross, J.; Higgins, N.; Graves, M.; Kirkpatrick, P.; Antoun, N.; Gillard, J.H.

    2004-01-01

    AIM: To compare conventional digital subtraction x-ray angiography (DSA) and contrast-enhanced magnetic resonance angiography (MRA) of the carotid arteries in terms of patient satisfaction and preferences. METHODS: One hundred and sixty-seven patients with symptomatic carotid artery disease, who underwent both DSA and MRA, were prospectively recruited in this study. Patients' perceptions of each method were assessed by the use of a questionnaire after each procedure. Main outcome measures were anxiety, pain, satisfaction rate and patient preferences. RESULTS: DSA generated more anxiety and pain during the procedure, but the severity of these ill-effects was mild. Satisfaction rates for each method were similar. More patients were, however, willing to have a repeat MRA compared with DSA (67 versus 41%). The majority of patients (62%) preferred MRA over DSA (31%). The shorter MRA imaging time was found to be a significant factor in patients' acceptance of the technique. The main reasons cited by patients for their dislike of a particular procedure was noise and claustrophobia for MRA and invasiveness, pain and post-procedural bed rest for DSA. CONCLUSIONS: MRA is the method that is preferred by the majority of patients, although the actual disutility of DSA may be small. Assuming equal diagnostic accuracy, our data supports replacement of DSA by MRA for routine carotid imaging

  19. 75 FR 52616 - Third Party Testing for Certain Children's Products; Youth All-Terrain Vehicles: Requirements for...

    Science.gov (United States)

    2010-08-27

    ... content of the ILAC-MRA approach and of the requirements of the ISO/IEC 17025:2005 laboratory... must be to ISO Standard ISO/IEC 17025:2005, General Requirements for the Competence of Testing and... that at that time was ISO/IEC 17025 accredited by an ILAC-MRA signatory. For firewalled conformity...

  20. The diagnostic accuracy of acetabular labral tears using magnetic resonance imaging and magnetic resonance arthrography: a meta-analysis

    Energy Technology Data Exchange (ETDEWEB)

    Smith, Toby O. [University of East Anglia, Faculty of Health, Queen' s Building, Norwich (United Kingdom); Hilton, Gemma [Norfolk and Norwich University Hospital, Norwich (United Kingdom); Toms, Andoni P.; Donell, Simon T. [Norfolk and Norwich University Hospital, University of East Anglia, Norwich (United Kingdom); Hing, Caroline B. [St. George' s Hospital, London (United Kingdom)

    2011-04-15

    Magnetic resonance imaging (MRI) and magnetic resonance arthrography (MRA) have been advocated for the diagnosis of acetabular labral tears. The purpose of this study was to determine the sensitivity and specificity of MRI and MRA in diagnosing acetabular labral tears using meta-analysis. Pertinent published and unpublished literature databases were reviewed. A two-by-two table was constructed to calculate the sensitivity and specificity of MRI or MRA investigations against surgical outcomes. Pooled sensitivity and specificity and Receiver Operating Characteristic curve (ROC) evaluations were performed. Methodological quality of each study was assessed using the QUADAS (Quality Assessment of Diagnostic Accuracy Studies) tool. Nineteen papers assessing 881 hips were reviewed. Conventional MRI was assessed in 13 studies and MRA was assessed in 16 studies. Whilst both MRI (0.5-3T) and MRA (0.5-3T) presented with a moderate sensitivity and specificity (sensitivity 66%, 87%; specificity 79%, 64%), diagnostic accuracy of MRA appeared to be superior to MRI in detecting acetabular labral tears on ROC curve interpretation. The literature poorly described population characteristics, assessor blinding, with limited sample sizes. MRI and MRA may be useful adjuncts in the diagnosis of acetabular labral tears in adults. MRA appears to be superior to conventional MRI. (orig.)