A Study on the Optimization of Excretory Imaging in CT Urography

Abstract

In order to obtain proper expansion of the bladder and a homogeneous EP image from the excretory image of CT urography, we urinated after UP images obtained EP images after 7 min and 14 min and compared them with EP images of the existing method to find usefulness. The subjects of the study were 90 patients who visited our hospital and CTU using furosemide and 30 patients were divided into the existing method (Group A), 7 min EP (Group B) after urination and 14 min EP (Group C) after urination. Through the Image J function, the bladder volume of each group's UP image and EP image was measured and the average CT number and standard deviation of the bladder's anterior and posterior were measured with an ROI of 30 ㎟ in diameter. As a result the bladder volume of each group increased by 75.07%, 23.98%, and 50.31%, respectively in EP images compared to UP images. The CT number of the bladder anterior and posterior was measured to be relatively higher in group B and group C than in group A. The Gap of anterior and posterior CT number of bladder was the largest in group A at 53.06 ± 0.12 HU and group B and group C were measured 71.95% and 71.61% lower than group A. In conclusion, the method of urinating after injecting diuretics and obtaining EP images after 7 min during CTU helps to obtain proper expansion of the bladder and homogeneous images in the bladder, and is considered to be of great help in diagnosis.