Uroradiographic dosimetry using a rare-earth screen-film system

Radiation dose was recorded for 68 patients undergoing urography with nephrotomography using rare-earth screen-film combinations. Correlation of patient data with both Alderson and Presswood phantoms (10-30 cm) was obtained. Doses were calculated on the basis of an 11-exposure urogram. The patient population thickness was 15-31 cm. Surface doses were 1.58 rad (15.8 mGy) to 45.7 rad (457 mGy). Average dose at beam center varied from 1.15 rad (11.5 mGy) to 7.01 rad (70.1 mGy). Average dose to the following organs was calculated using the 21 cm phantom: left kidney-0.453 rad (4.53 mGy); right kidney-0.446 rad (4.46 mGy); ovary-0.109 rad (1.09 mGy); breast-0.040 rad (0.40 mGy); and thyroid-0.02 rad (0.20 mGy).