Intracranial vascular stenosis and occlusion: comparison of 3D time-of-flight and 3D phase-contrast MR angiography
| Autor: | Peter Reimer, M. G. Lentschig, M. Oelerich, Ernst J. Rummeny, P. Zunker, Gerhard Schuierer |
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| Rok vydání: | 1998 |
| Předmět: |
Adult
Male medicine.medical_specialty Ultrasonography Doppler Transcranial Sensitivity and Specificity Magnetic resonance angiography Brain Ischemia Central nervous system disease medicine.artery Occlusion medicine Image Processing Computer-Assisted Humans Radiology Nuclear Medicine and imaging Neuroradiology Aged Observer Variation medicine.diagnostic_test Vascular disease business.industry Digital subtraction angiography Middle Aged medicine.disease Image Enhancement medicine.anatomical_structure Circle of Willis Female Neurology (clinical) Radiology Cardiology and Cardiovascular Medicine business Magnetic Resonance Angiography Artery |
| Zdroj: | Neuroradiology. 40(9) |
| ISSN: | 0028-3940 |
| Popis: | We compared the value of 3D time-of-flight (TOF) and phase-contrast (PC) MR angiography (MRA) for detection and grading of intracranial vascular steno-occlusive disease. Unenhanced 3D-TOF MRA and 3D-PC MRA (30–60 cm/s velocity encoding) were performed at the level of the circle of Willis in 18 patients, mean age 56 ± 10 years. Postprocessed images using a maximum-intensity projection reconstruction with multiple targetted projections were analysed. A total of 126 vessels was assessed by PC MRA and 143 by TOF MRA, with digital subtraction angiography (DSA) in 15 patients and/or transcranial Doppler sonography (TCD) in 18 as a standard. Two blinded readers reviewed the MRA, DSA and TCD examinations retrospectively. On DSA and/or TCD the two observers found 32 and 28 steno-occlusive lesions. 3D-TOF MRA was more sensitive than 3D-PC MRA (87 % and 86 % vs. 65 % and 60 %) and had a higher negative predictive value (96 % vs. 89 %). Correct grading of stenoses was achieved in 78 % by 3D-TOF and 65 % by 3D-PC MRA. |
| Databáze: | OpenAIRE |
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