[CT angiography hemodynamically relevant to renal artery stenosis. Evaluation of AXIAL, MPR, MIP and SSD reconstruction procedures under standard investigation conditions]. / CT-Angiographie hämodynamisch relevanter Nierenarterienstenosen. Evaluation der Rekonstruktionsverfahren AXIAL, MPR, MIP und SSD unter standardisierten Untersuchungsbedingungen.

ABSTRACT

PURPOSE: To evaluate the various reconstruction methods of helical-CT angiography for the assessment of hemodynamically relevant renal artery stenoses in comparison to i.a. DSA. METHODS: In 76 renal arteries the reconstruction modalities AXIAL, MRP, MIP and SSD of helical-CT angiography were compared with the results of i.a. DSA for the determination of the grade and location of the stenosis. RESULTS: The highest accuracy of stenosis grading was 76% with AXIAL reconstruction. In 8% of the cases grading of the stenosis was not evaluable by the AXIAL reconstruction. In these cases, a higher sensitivity in the detection of hemodynamically relevant stenoses (> grade II, > 50%) was achieved with the reconstruction mode MPR (96%) than with MIP (92%). In 51% of the cases the reconstruction mode SSD was not suitable for any diagnosis of renal artery stenosis because of overlying calcified plaques. CONCLUSIONS: The evidence of hemodynamically relevant stenosis in helical-CT angiography in comparison to i.a. DSA succeeds most reliable by using the reconstruction modality AXIAL in combination with MPR. The MIP reconstruction provides information about the anatomy of the renal arteries within one image.