Floery, D. and Fellner, F. A. and Fellner, C. and Ginthoer, C. M. and Uder, M. and Pallwein-Prettner, L. and Roeper-Kelmayr, J. and Dirisamer, A. (2011) Time-Resolved Contrast-Enhanced MR Angiography of the Lower Limbs: Solving the Problem of Venous Overlap. ROFO-FORTSCHRITTE AUF DEM GEBIET DER RONTGENSTRAHLEN UND DER BILDGEBENDEN VERFAHREN, 183 (2). pp. 136-143. ISSN 1438-9029, 1438-9010
Full text not available from this repository. (Request a copy)Abstract
Purpose: The aim of this retrospective study was to evaluate peripheral MRA using time-resolved measurements at the femoral as well as the calf level with regard to the presence of unwanted venous overlap. Materials and Methods: 150 patients were examined using a 1.5T MRI unit for a three-step CE MRA approach with three partial injections of contrast agent (0.1 mmol/kg body weight of 1 molar contrast agent). Dynamic time-resolved measurements were used at the femoral as well the calf level. The images were analyzed with respect to the presence and grade of unwanted venous overlap as well as inadequate bolus timing. Results: In all cases, MRA was technically successful. The overall image quality was assessed as excellent in 127/150 cases (84.7%), as mildly limited in 21 cases (14%) and as moderately limited, but still diagnostic in 2 cases (1.3%). No obvious overlap was found in 139 of 150 cases (92.7%). Non-diagnostically relevant minor overlap was found in 7 cases (4.6%) and non-diagnostically relevant moderate overlap in 4 cases (2.7%). Relevant venous overlap did not occur. Those 11 cases with minor or moderate overlap occurred at the calf level in 8 cases, at the calf and femoral level in 2 cases and at the femoral level only in one case. In 10 out of 11 cases, peripheral artery occlusive disease was classified as category IV (Fontaine). Conclusion: Three-step time-resolved CE MRA with dynamic measurements at the calf as well the femoral level can be considered as a safe and accurate technique for MRA of the lower limbs without significant venous overlap and without risk of inadequate bolus timing. Furthermore, it solves the problem of run time differences.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MAGNETIC-RESONANCE ANGIOGRAPHY; DIGITAL-SUBTRACTION-ANGIOGRAPHY; ARTERIAL OCCLUSIVE DISEASE; STANDARD BOLUS-CHASE; LOWER-EXTREMITY; PERIPHERAL ARTERIES; SPATIAL-RESOLUTION; INTRAARTERIAL DSA; PEDAL ARTERIES; 3.0 T; arteries; CE MRA; peripheral arterial occlusive disease; single-step technique; time-resolved MRA; venous overlap |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Röntgendiagnostik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 29 Jun 2020 05:13 |
| Last Modified: | 29 Jun 2020 05:13 |
| URI: | https://pred.uni-regensburg.de/id/eprint/21371 |
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