Radionuclide scanning also provides more information than does IV urography or cross-sectional imaging about the following: Segmental renal emboli Renal parenchymal scarring due to vesicoureteral reflux Functional significance of renal artery stenosis Kidney function in living donors before transplantation 99 m Tc pertechnetate can be used to image blood flow to the testes and to distinguish torsion from epididymitis in patients with acute testicular pain, although Doppler ultrasonography is used more commonly because it is quicker.