Compared Study Of Radiology In Lower Extremity Arterial Stenosis Or Occlusion

Objective: To investigate the value of DSA, MSCTA and CEMRA in lower extremity arterial stenosis or occlusion. Methods: 42 suspected cases of lower extremity arterial stenosis or occlusion accepted DSA and MSCTA examinations. Compared the two methods by which showed the definition, grade of arterial lumen stenosis, sensitivity, specificity, accuracy and bypass circulation in 21 confirmed patients. Compared DSA and DEC-MRA by which showed the grade of arterial lumen stenosis and bypass circulation in 20 confirmed patients. Results: CTA was better than DSA in definition of artery, but with no significant difference (P≥0.05) . CTA was not conformed to DSA in 2 cases of iliac artery type, 4 cases of femoral or artery type and 4 cases of leg artery type. Compared with DSA, CTA over-estimate the degree of stenosis so as with more false positive rate. The sensitivity, characteristics and accuracy of CTA decreased with the degree of arterial stenosis, while with high specificity in general, but with no significant difference (P≥0.05) . Compared with DSA, CTA had the worse image of bypass circulation with the degree of arterial stenosis. It would increase the positive rate of bypass circulation and distal artery of occlusion by increasing contrast dosage and exposure time in DSA. Compared with DSA, DEC-MRA over-estimated 7 segments of artery with<50% stenosis, but with no significant difference (P≥0.05 ) . Over-estimated 1 segments of artery with 51-99% stenosis, and 5 segments with completely occluded in small arteries imaging. DSA was much better than DEC-MRA in bypass circulation imaging.Conclusion: CTA and DCE-MRA are more and more used in primarily detectinglower extremity arterial stenosis or occlusion, but DSA is still the first choice ofdiagnosis and intervention.