Clinical Application Of 3D Contrast-enhanced Moving-bed MRA In Arterial Diseases Of Lower Extremities

Objective: To study the clinical value of 3D contrast-enhanced moving-bed MRA in the diagnosis of lower extremity artery diseases and to explore the advantages of moving-bed technique. Methods: Among 42 patients examined 3D contrast-enhanced moving-bed MRA for being suspected lower extremity arterial diseases, 34 of them underwent 2D TOF MRA. Among 42 patients, DSA was carried out in 11 cases and subsequent operation was performed in 14 cases. The 20 cases diagnosis was compared with the DSA and operation which are always the "gold standard". Result: 521 arterial segments of 34 cases were shown by 2D TOF MRA(visibility was 80.7%), and 641 arterial segments were shown by 3D contrast-enhanced moving-bed MRA(visibility was 99.2%). This difference in visibility was statistically significant x~2= 120, p<0.05). All 42 cases get clear pictures and all diseased arteries were well demonstrated by 3D contrast-enhanced moving-bed MRA. Based on DSA as standard in 84 arterial segments of 11 cases examined 3D contrast-enhanced moving-bed MRA, the rate of accordance was 85.7%(72/84); 3D contrast-enhanced moving-bed MRA have sensitivity, specificity, positive predictive value and negative predictive value of 95%, 98.5%, 90.5% and 96.8% respectively. Based on operation as standard in 46 arterial segments of 14 cases, The rate of accordance of severe stenosis and occlusion was 86.67% and 100% respectively. 5 cases who were acute occlusion compared with operation, there was no significant difference between 3D contrast-enhanced moving-bed MRA and operation (t=2.251, p>0.05). Conclusion: Compared with DSA and...