| LU Xiao-guang,WANG Yun-lai,HUO Xiao-qing,SHA Xiang-yan,LIAO Xiong-fei.Penumbra measuremnts of BeamModulatorTM multileaf collimator[J].Chinese Journal of Radiological Medicine and Protection,2010,30(4):452-455 |
| Penumbra measuremnts of BeamModulatorTM multileaf collimator |
| Received:October 04, 2009 |
| DOI：10.3760/cma.j.issn.0254-5098.2010.04.023 |
| KeyWords:Radiotheray Multileaf collimator Penumbra Dosimetry |
| FundProject: |
| Author Name | Affiliation | E-mail | | LU Xiao-guang | Department of Radiation Oncology, PLA General Hospital, Beijing 100853, China | | | WANG Yun-lai | Department of Radiation Oncology, PLA General Hospital, Beijing 100853, China | nanyangwang@163.com | | HUO Xiao-qing | Department of Radiation Oncology, PLA General Hospital, Beijing 100853, China | | | SHA Xiang-yan | Department of Radiation Oncology, PLA General Hospital, Beijing 100853, China | | | LIAO Xiong-fei | Department of Radiation Oncology, PLA General Hospital, Beijing 100853, China | |
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| Abstract:: |
| Objective To evaluate the penumbra of a new multileaf collimator equipped with Elekta Synergy accelerator.Methods The penumbra were derived from beam profiles measured in air and water using PinPoint ion chamber with PTW MP3 water phantom. Variations of penumbra with X-ray beam energy, depth in water, and leaf position were investigated.Results The penumbra in air for 6 MV X-ray was 2 mm less than that at depth of maximal dose in water. The penumbra of leaf side was 1 mm less than that of the leaf end. The penumbra had close relationship with beam energy, depth in water and leaf position. Penumbra was increased with beam quality and water depth. The leaf position had great influence on the penumbra.Conclusions The penumbra of the multileaf collimator is related to its original design and radiation delivery technique. Special considerations should be taken into during treatment planning. Regular measurement should be performed to guarantee the delivery quality. |
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