64-Detector CT Angiography in Renal Artery Stent Evaluation: Prospective Comparison with Selective Catheter Angiography

Purpose: To prospectively assess the diagnostic accuracy of 64-detector computed tomographic (CT) renal artery (RA) angiography for the evaluation of RA in-stent restenosis (ISR) by using selective catheter RA angiography as the reference standard. Materials and Methods: Institutional review board approval and written informed consent were obtained. Eighty-six patients (46 men, 40 women; mean age ± standard deviation, 71 years ± 9) with 95 RA stents were examined with 64-detector CT RA angiography by experienced radiologists 1 day before selective catheter RA angiography was performed by experienced cardiologists. Each group was blinded to the results of the other imaging method. For image reconstruction, a standard (B25f) and an edge-enhancing (B46f) kernel were chosen. An ISR of more than 50% was considered as hemodynamically significant. Sensitivity, specificity, and positive and negative predictive values for the detection of ISR by using CT RA angiography were calculated. Results: At CT RA angiograph...