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Examples of region of interest (ROI) drawings on the urinary bladder of a 65-year-old male patient (A) and on a renal cyst of an 88-year-old female patient (B). The requirements for drawing the ROIs on the urinary bladder comprised an ROI size of >15 cm2 and a border drawn at least 0.5 cm away from the inner wall of the urinary bladder. The border of the ROI drawn on the renal cysts was at least 0.2 cm away from the cyst walls. ROI = region of interest.
