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摘要
Purpose: The objective of this study was to describe contrast-enhanced magnetic resonance angiography (MRA) of the lower extremities at 3.0T system for assessment of high resolution images in patients with peripheral arterial occlusive disease (PAOD). Material and methods: 21 Patients with suspected PAOD were examined with four-station MRA at a 3.0T MR system. The MRA protocol consisted of a hybrid technique with two contrast media injections, the first one for visualization of the calf and foot vasculature (non-moving-table technique), the second one for imaging the aortoiliacal and femoral arteries (moving-table technique). For the femoropopliteal and calf station a randomly segmented central k-space ordering (contrast-enhanced timing-robust angiography [CENTRA]) was used. MR-images were analyzed independently by two radiologists with regard to image quality, venous overlap and grade of stenosis. In 6 patients digital subtraction angiography was performed within the following 7 days and evaluated by two radiologists in consensus with regard to the grade of stenosis. The vasculature-tree of each leg was divided in 12 segments, and 3 anatomical regions (iliacal, femoropopliteal, calf/foot). Results: 490 and 488 of 495 arterial segments were visualized with diagnostic image quality by observer I and observer 2, respectively. Image quality was excellent in 470 and 457 arterial segments, respectively. Only 4 segments were rendered as non-diagnostic due to venous overlap. Relevant arterial stenoses (50-99%) were detected in 43 and 47 segments by observer I and observer 2, 66 and 65 arterial segments, respectively, were interpreted as occluded. Conclusion: The hybrid MRA protocol at 3.0T offers high diagnostic quality for the whole peripheral arterial tree without venous contamination at high spatial resolution.
- 出版日期2009-4
- 单位河北医科大学
