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| The estimation of patient's exposure dose during esophageal stent placement under X-ray fluoroscopy |
| ZHANG Lin, YANG Shuhui, NIU Fei, MIN Nan, LI Zhen, LI Hailiang, SONG Gang, SUN Weihang, LIU Hanxiao, ZHU Jianguo |
| School of Preventive Medicine Sciences (Institute of Radiation Medicine)，Shandong First Medical University (Shandong Academy of Medical Sciences), Jinan 250062 China |
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Abstract Objective To estimate patient's exposure dose during esophageal stent placement under X-ray fluoroscopy through anthropomorphic phantom experiments.Methods Investigated 60 cases of esophageal stent implantation provincial tertiary hospitals and recorded intraoperative fluoroscopy time, tube voltage, tube current and other information. The anthropomorphic phantom experiments were divided into 3 groups according to the duration of fluoroscopy, cumulative dose and the size of the DAP, and a pyroelectric dosimeter was placed in predetermined holes within the anthropomorphic phantom to restore the surgical procedure in groups according to the experimental conditions. The patient's dose was estimated based on the results of the thermoluminescence dosimeter.Results In this study, under X-ray fluoroscopic esophageal stent placement, the effective doses for patients in the high, medium, and low dose groups were 10.773, 4.004 and 1.889 mSv, respectively. The highest values of absorbed dose from different tissues or organs in the three dose groups (high, medium and low) were in the red bone marrow, followed by muscle, esophagus and lung, with the lowest values in the testes.Conclusion Estimates of the effective dose to patients were proportional to the duration of fluoroscopy, cumulative dose, and size of DAP in the experimental conditions. The magnitude of the absorbed dose to the same tissue and organ increases with increasing fluoroscopy time in different dose groups. The amount of absorbed dose to different tissues and organs in the same dose group is closely related to the tissue weighting factor, the magnitude of the mass-energy absorption coefficient and whether the tissue or organ is irradiated by the main beam.
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Received: 13 May 2020
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