ESTIMATION OF PRACTICAL DOSIMETRY AND EXPOSURE PARAMETERS FOR PATIENTS UNDERGOING DIFFERENT IMAGING MODALITIES FOR RENAL DIAGNOSIS

Imaging of the renal system is done with different procedures depending mainly on clinical symptoms and signs. Renal Scintigraphy and Urography provides physicians by useful detailed information. However, it is the responsibility of radiologist and technologist to determine scanning technique factor that provides balance between image quality and radiation dose and helps in keeping patient radiation exposure as lowest as possible. The present study was intended to evaluate patient radiation dose for nuclear medicine using Technetium-99m DTPA dynamic renal scan and Computed Tomography Urography (CTU). This study was conducted in Assiut University. Machines used for renal scan were Orbiter Gamma camera dual head and CT machine. Effective doses were estimated using conversion factors. Patient results radiation dose values for DTPA renal scan were Dose Length Product (DLP) (61.34 mGy-cm) and Effective dose (0.92 mSv). Patient radiation dose values for CTU were DLP (753.19 mGy-cm) and Effective dose (11.29 mSv).