Determination of Absorbed dose of patients organs under kidney Scintigraphy by using the MIRD Dosimetry method

Background: kidney scan is a diagnostic procedure in nuclear medicine center to diagnose kidney diseases. With all the benefits of nuclear medicine images, undoubtedly work with radioactive materials would create many problems. For this reason, the measurement of absorbed dose of each method is useful for assessing risk and profit. The purpose of this study was to calculate absorbed dose of kidneys, liver, spleen, and bladder organs in kidney scintigraphy. Materials & Methods: In this study, each of the patients were injected with 10 mCi of 99mTc-EC. Imaging of patients obtained at 2, 30, 60, 180 minutes after injection by using gamma camera. In each of the time by drawing the ROI on any of the organs and then the activity was obtained by using the conjugate view method. Finally, absorbed dose was calculated by using the MIRD method. Results: Absorbed doses per administered activity for liver, kidneys, spleen, and bladder obtained 13±0.66, 2.1±0.24, 2.2±0.38, 335.43±3.3 mrad/mCi respectively. Conclusion: in this study, Bladder and liver received highest and lowest absorbed doses respectively. Also, the results of this study, showed good agreement with ICRP no.106 report