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Tomography during excretory urography. Technical aspects

Department of Radiology, Thomas Jefferson University, Hospital, 11th and Walnut Streets, Philadelphia, Pennsylvania

A technique for routine tomography during excretory urography has been standardized by determining the optimal number, thickness and level of cuts. The optimum level is best gauged by measuring the antero-posterior diameter of the abdomen. Using the predicted level of cut with one cut 2 cm above and one 2 cm below this, the kidney will be shown in the great majority of cases. The optimal angle of swing for routine use is 25 deg., but 40 deg. may give improved results in high dose nephrctomography. Zonography is not found to eliminate overlying bowel shadows adequately. Multileaf cassettes are found to give an unacceptable loss of detail. Manoeuvres aimed at altering the long axis of the kidney are of little value. The best time for routine tomography is about ten minutes after injection of contrast, when the nephrographic intensity has diminished and the pyelographic density is optimal.

Received for publication January 1, 1972. Revision received May 1, 1972.