Value of 64-slice spiral CT in diagnosis of lower extremity artery occlusive disease

Objective To assess the value of 64-Slices spiral CTA with DSA comparatively in diagnosis of lower extremity arterial occlusive disease. Methods CTA was used to examine 48 patients with clinically suspected lower extremity arterial occlusive disease. Among the 48 patients,29 patients also underwent DSA examination within one week. CT was performed with scan range from 1 000 mm to 1 200 mm,thickness of 6 mm,pitch of 0. 8,reconstruction thickness of 1 mm. Dosage of contrast agent was 1. 5 mL·kg-1and the injection rate was 4. 5 mL·s-1. All images were reconstructed by multi-planar reformation( MPR),volume rendering( VR),maximum intensity projection( MIP) in working-station respectively. Lower limb angiography was inspected subsectly by DSA. CTA and DSA data of 29 patients were compared with each other. Results DSA was taken as the gold standard to evaluate the diagnosis accuracy of CTA. The sensitivity,specificity of lower extremity arterial stenosis( vessel stenosis≥50%) were 92. 5%(161 /174) and 97. 1%(103 / 106) respectively. CTA and DSA were shown no obvious difference in the diagnosis of lower extremity artery occlusive disease( χ2= 0. 385,P = 0. 984). Conclusions The arterial occlusive diseases in the lower extremity can be well shown by 64-slice spiral CTA,which is a reliable method for evaluating the lower extremity arterial occlusive disease.