| HE Zhi-jian,YUAN Ji-long,GAO Lei,LUO Su-ming,QIU Jie,YANG Bo,PANG Ting-tian.Development of the Diode method for patient's dose measurement in radiotherapy[J].Chinese Journal of Radiological Medicine and Protection,2011,31(3):355-358 |
| Development of the Diode method for patient's dose measurement in radiotherapy |
| Received:February 22, 2010 |
| DOI：10.3760/cma.j.issn.0254-5098.2011.03.029 |
| KeyWords:Diode Treatment planning system Photon beam Radiotherapy Dose |
| FundProject:IAEA资助项目(13114/R0) |
| Author Name | Affiliation | | HE Zhi-jian | National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China \
| | YUAN Ji-long | National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China \
| | GAO Lei | National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China \
| | LUO Su-ming | National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China \
| | QIU Jie | 北京协和医院 | | YANG Bo | 北京协和医院 | | PANG Ting-tian | 北京协和医院 |
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| Abstract:: |
| Objective To explore the measurement method of the treatment dose of the patient with Diode for photon beam in radiotherapy,and to validate the treatment dose by comparing with the treatment planning system (TPS). Methods Experiments of the reproducibility, dose rate dependence, non-linearity dose response, and calibration factor in 60Co γ and 6 MV X beams were carried out with Diode on the surface of solid phantom and in water phantom. According to the needs of clinic treatment, different conditions were chosen to observe the dose changes with the angle of incidence, energy response, distance of source to skin, field size, wedge angle, block and tray using ionization chamber and water phantom. The Diode was placed on the surface of the solid phantom to obtain the correction factors. The doses of the chest, abdomen, and head and neck were verified with the Alderson phantom and Diode. Diode doses of the pelvis, head and neck at 14 points on the patient were measured. Results The Diode was irradiated at the points of the Alderson phantom, such as AP, RL and LL of the pelvis, with and without wedges, RL and LL junction of the neck and chin, with and without mask, the maximum relative deviation of doses was within ±3% between Diode and TPS. The Diode was placed in different locations on the patient, including chest, abdomen and head and neck. The relative maximum deviation of doses was within ±5% between Diode and TPS. Conclusions The Diode method is reliable for measuring the exposure doses of the patient in radiotherapy. |
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