[The technique for demonstrating the renal arteries during an excretion urogram. Bolus technique--timing--simultaneous tomography (author's transl)].

The aorta and renal arteries, as far as their intrarenal branches, can be demonstrated in the course of an excretion urogram if the contrast medium (1 ml/kg body weight, maximum 60 ml) is injected at a flow rate of 10 to 15 ml/sec (Bolus technique). The intravenous bolus injection was carried out in 180 patients without any significant complications. In order to obtain the correct timing on a single film it is necessary to determine the circulation time from the arm vein to the abdominal aorta in each individual. The addition of 0.2 to 0.3 mCi 99mTc to the contrast medium makes it possible to determine the circulation time accurately. This varied from 9 to 22 seconds. By using tomography with 1 cm cuts and a 4.5 cm format, it was possible to show the left or right renal arteries from the aorta to their intrarenal branches in 82% patients. In 126 (70%) of the 180 patients, both renal arteries were demonstrated. The demonstration of renal arteries during the course of an excretion urogram represents an advance on the conventional technique. The indications are discussed.