Fig. 1
From: Aortic calcification burden predicts deterioration of renal function after radical nephrectomy
Patient selection and measurement of aortic calcification index (ACI). Aortic calcification was quantitatively measured using preoperative abdominal computed tomography images, evaluating 10 slices scanned at 5-mm intervals above the abdominal aortic bifurcation. Each slice was divided in 12 sectors and the numbers of sectors with calcification were counted. The ACI was calculated by averaging the percentage of calcium-positive sectors in each slice