The comparative study of 64-slices spiral CT angiography with DSA in lower extremity arterial occlusive diseases

Objective To study the clinical value of 64-slices spiral CTA with DSA comparatively in diagnosis of lower extremity arterial occlusive diseases.Methods 31 patients with lower extremity arterial occlusive diseases underwent 64-slice spiral CT angiography of lower extremity arteries and they also underwent digital subtraction angiography(DSA)two weeks later.Reconstruction by maximum intensity projection(MIP),volume render(VR)and multiplanar reformatting(MPR)in working-station was undertaken comparing with the bolus chase DSA and traditional DSA for diagnostic accuracy.Results The 216 arterial segments of lower extremity were selected,including 157 segments with consistent results in demonstrating degree of stenosis by both examinations.On CT angiography,5 segmental stenosis were overestimated and 9 were underestimated.When stenosis of detected segments is more than 50%,the sensitivity,specificity,accuracy,positive predic-tive value,and negtive predictive value of CTA were 98.21%,96.15%,97.22%,96.49%,and 98.04%,respectively.Conclusion 64-slices spiral CT angiography is an effective and reliable method for evaluating the lower extremity arterial occlusive diseases and may provide precious information for planning interventional therapy.