Fig. 1
From: Persistent CT nephrograms following cardiac catheterisation and intervention: initial observations
CT images providing a grading scale for intensity of delayed nephrograms from none to marked. Three ROIs (range 0.2–0.5 cm2) of anterior, lateral and posterior cortex and the median attenuation values (HU) of right and left kidneys are presented. a Axial CT of kidneys in a non-contrast study performed for liver imaging. Abdomen window width and level show the cortical median values 35.2 HU and 34.3 HU, right and left kidneys, respectively. b CT nephrograms classified as faint with cortical median values 64.9 HU and 61.8 HU, right and left kidneys, respectively. There is faint vicarious excretion in the ascending colon. Presumed densely calcified lumph node in the mid abdomen was present on prior CT scans. c CT nephrograms classified as moderate with cortical median values 91.8 HU and 93.6 HU, right and left, respectively. d CT nephrograms classified as marked with cortical median values 156.4 HU and 163.3 HU, right and left kidneys, respectively. Vicarious excretion is noted in the descending colon and small bowel