| JIA Mingxuan,ZOU Huawei,WU Rong,et al.Measurement and analysis of the thoracic patient setup deviations in routine radiotherapy[J].Chinese Journal of Radiological Medicine and Protection,2003,23(3):193-195 |
| Measurement and analysis of the thoracic patient setup deviations in routine radiotherapy |
| Received:December 25, 2002 |
| DOI： |
| KeyWords:Thoracic irradiation EPID Setup deviations |
| FundProject:辽宁省自然科学基金资助项目(20022070) |
| Author Name | Affiliation | | JIA Mingxuan | Center of Radiation Oncology, 2nd Hospital, China Medical University, Shengang 110004, China | | ZOU Huawei | Center of Radiation Oncology, 2nd Hospital, China Medical University, Shengang 110004, China | | WU Rong | Center of Radiation Oncology, 2nd Hospital, China Medical University, Shengang 110004, China | | 孙健 | Center of Radiation Oncology, 2nd Hospital, China Medical University, Shengang 110004, China | | 董晓棋 | Center of Radiation Oncology, 2nd Hospital, China Medical University, Shengang 110004, China |
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| Abstract:: |
| Objective To determine the magnitude of the setup deviations of the thoracic patients in routine radiotherapy. Methods Altogether 408 films for 21 thoracic patients were recorded using the electronic portal imaging device (EPID), and comparison with reference CT simulator digitally-reconstructed radiograph (DRR) for anterior-posterior fields was performed.The deviation of setup for 21 patients in the left-right (RL), superior-inferior(SI)directions and rotation about the anterior-posterior (AP) axis were measured and analyzed. Results Without immobilization device, the mean translational and rotational setup deviations were (0. 7±3. 1) mm and (1.5±4. 1) mm in the RL and SI directions, respectively, and (0. 3±2. 4)° about AP axis.With immobilization device, the mean translational and rotational setup deviations were (0.5±2.4) mm and (0.8±2. 7) mm in the RL and SI directions respectively, and (0.2±1.6)° about AP axis. Conclusion The setup deviations in thoracic patients, irradiation may be reduced with the use of the immobilization device.The setup deviation in the SI direction is greater than that in the RL direction.The setup deviations are mainly random errors. |
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