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| Measurement of dose field distribution around mobile cone beam computed tomography (CBCT) |
| ZONG Rui1, WANG Nan2, BO Wenzhu2, LIU Lei1, ZHAI Hezheng3,4, GAO Jie4, CAO Wentian5, YU Xinguang1, ZHAI Zipo6 |
1. General Hospital of People's Liberation Army, Beijing 100853 China;
2. Tianjin Jinxi Medical Equipment Co., Ltd., Tianjin 300385 China;
3. Tianjin University, Tianjin 300072 China;
4. Institute of Radiology, Chinese Academy of Medical Sciences, Tianjin 300110 China;
5. Peking University, Beijing 100871 China;
6. Hunan Prevention and Treatment Institute for Occupational Diseases, Changsha 410007 China |
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Abstract Objective To measure the peripheral dose distributions of the mobile head cone beam computed tomography (CBCT) and evaluate the impact of CBCT on the surrounding personnel and environment, and provide data support for clinical radiation protection management. Methods Combined with the structural characteristics of CBCT, AT1123 was used in the direction of 0° (counterclockwise), 45°, 90°, 135°, 180°, 225°, 270° and 315° in front of CBCT to measure the ambient dose equivalent rate of 30 cm, 80 cm and 130 cm away from the ground when the equipment was normally out of the beam, and the boundary of the temporary control area was drawn. At the same time, the dose level behind the lead screen 1 m away from the external surface of the equipment was measured and analyzed. Results The dose field around CBCT was symmetrically distributed with the dividing line of 0° and 180°, and the radiation dose level of 5.5 m in the direction of 0°, 3.5 m in the direction of 45°, 0.5 m in the direction of 90° and within 1.0 m in the direction of 180° (inside the "spoon" type) was higher than 2.5 μSv/h. The radiation dose levels of CT aperture 0° (straight forward), 45° and 315° behind the lead screen 1 m away from the equipment surface were 0.37 μSv/h, 0.22 μSv/h and 0.54 μSv/h, respectively. Conclusion The results show that the radiation dose around the mobile head cone beam CT is in a low dose level, the distribution of the dose field can provide necessary reference for the administrative and medical personnel to strengthen the radiation safety management. At the same time, it is suggested that lead screens should be set up in the clinical use of mobile CT to ensure the health and safety of the surrounding people and the environment.
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Received: 13 March 2021
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