Morita S, Ogawa Y, Yamamoto T, et al. - The present study was undertaken to investigate the image quality of early postoperative CT angiography with low contrast material and radiation dose utilizing model-based iterative reconstruction (FIRST) for screening pseudoaneurysms after partial nephrectomy. Before surgery, CT angiography was obtained utilizing conventional iterative dose reduction reconstruction (AIDR 3D) with 120 kVp and 600 mgI/kg of contrast material and obtained after partial nephrectomy doing FIRST with 80–100 kVp and 360 mgI/kg in 35 individuals. Between FIRST and AIDR 3D, researchers retrospectively compared contrast-to-noise ratio, visual image quality scores using a 5-point scale, and longest length of the unaffected renal arteries on maximum intensity projection images. There were no significant differences in contrast-to-noise ratio or image quality scores of the renal arteries between FIRST and AIDR 3D. In comparison with AIDR 3D, FIRST can improve visualization of the peripheral renal arteries with contrast material and radiation dose decreased by approximately 30 %, which enables adequate evaluation of pseudoaneurysms after partial nephrectomy.