Evaluation of the Effective Dose from Transmission Scan in Whole Body Bone Scan with SPECT-CT in Shariati Hospital

whole body bone scan is one of the most useful procedures of nuclear medicine. Accurate distribution of radiopharmaceutical is yielded by using SPECT-CT. There are concerns about the radiation dose of CT part. The present study aimed to evaluate the patients’ dose in bone nuclear medicine imaging. Methods and Materials: First of all, the dose report of CT console was calibrated using CT head and body phantom. Then, imaging and personal data of 70 adult patients were collected. The software of Impact-Dose and MIRD were used to calculate the effective dose (ED) of CT and radiopharmaceutical respectively. CT dose were reported in terms of volume CT Dose index (CTDIvol), dose length product (DLP), and ED. Patients doses were 2.02 mGy, 93.5 mGy.cm and 1.33 mSv in terms of CTDIvol, DLP, and ED respectively. The 3rd quartile was 3.01 mGy, 150 mGy.cm and 2.18 mSv. The highest dose was seen in multi-regional scan fields and the lowest was in head region. Discussion and Conclusion: The CT dose was considerable compared to the 99TC-MDP dose. Variations in received dose were caused by patient size and scan range. It is essential to increase the cares about the rules of optimization and justification for bone SPECT-CT.