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| A study of radiation protection optimization for nuclear medicine technologists during 99Tcm-MDP bone imaging |
| ZHANG Wenjie, LIU Xiuqin, LIU Fugeng, LI Xu, YAO Zhiming |
| Department of Nuclear Medicine, Beijing Hospital, National Center of Gerontology, Chinese Academy of Medical Sciences, Beijing 100730 China |
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Abstract Objective To analyze the ambient dose equivalent rate (ADER) of subjects during 99Tcm-MDP bone imaging and to optimize the on-site radiation protection for nuclear medicine technologists. Methods The ADERs at different time points and distances were measured in 33 subjects undergoing wholebody bone imaging after injection of technetium-99m-methylene diphosphonate (99Tcm-MDP); the ADERs were measured in 50 subjects at different body parts (e.g., thoraco-abdominal junction, pelvis, middle femur, and knees) and at different distances after injection of 99Tcm-MDP. Results The ADERs at 3 meters from the subjects 4 hours after injection of 99Tcm-MDP was (59 ±11)% of those 2 hours after injection; the ADERs at 1 to 7 meters from the subjects decreased significantly as the distance increased; 4 hours after injection of 99Tcm-MDP, the ADERs at 3, 5, and 7 meters from the subjects were (18 ±1)%, (7 ±1)%, and (2 ±1)%, respectively, of those at 1 meter (all P < 0.001). The ADERs at 0.1 meter from the subjects’ body surface were highest at the pelvis, followed by the thoraco-abdominal junction, middle femur, and knees, with P values smaller than 0.05. The ADERs at the pelvis decreased (49 ±6)% and (63 ±6)% from the body surface to 0.1 and 0.2 meters from the body surface, respectively. Conclusion The radiation protection measures for technologists during bone imaging can be further optimized as follows: bone imaging can be delayed appropriately until the radiation dose within subjects’ body is further reduced; technologists should keep as much distance as possible from subjects during guiding the subjects while providing them with adequate care; technologists should keep away from the torso of the subjects which bears the heaviest radiation.
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Received: 12 June 2021
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