| CHEN Yong,BAO Shang-lian,WU Hao,et al.Development of film dosimetric measurement system for verification of RTP[J].Chinese Journal of Radiological Medicine and Protection,2007,27(3):274-277 |
| Development of film dosimetric measurement system for verification of RTP |
| Received:June 05, 2006 |
| DOI： |
| KeyWords:Radiotherapy treatment plan γ index Film dosimetry Optical density NAT value |
| FundProject:国家自然科学基金(10175004),北京市重点自然科学基金(3011002),教育部重点项目(104237),北京市共建项目(SYS100010401) |
| Author Name | Affiliation | E-mail | | CHEN Yong | The Beijing Key Laboratory of Medical Physics and Engineering,Peking University, Beijing 100871,China | | | BAO Shang-lian | The Beijing Key Laboratory of Medical Physics and Engineering,Peking University, Beijing 100871,China | bao@pku.edu.cn | | WU Hao | 北京肿瘤医院 | | | 姬长国 | The Beijing Key Laboratory of Medical Physics and Engineering,Peking University, Beijing 100871,China | | | 韩树奎 | 北京肿瘤医院 | | | 张新 | The Beijing Key Laboratory of Medical Physics and Engineering,Peking University, Beijing 100871,China | | | 肖桂平 | 北京海思威科技有限公司 | |
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| Abstract:: |
| Objective To develop a novel film dosimetry system based on general laser scanner in order to verify patient-specific Radiotherapy Treatment Plan(RTP) in three-Dimensional Adaptable Radiotherapy(3D ART)and Intensity Modulated Radiotherapy(IMRT).Methods Some advanced methods, including film saturated development, wavelet filtering with multi-resolution thresholds and discrete Fourier reconstruction are employed in this system to reduce artifacts, noise and distortion induced by film digitizing with general scanner; a set of coefficients derived from Monte Carlo(MC) simulation are adopted to correct the film over-response to low energy scattering photons; a set of newly emerging criteria, including γ index and Normalized Agreement Test(NAT) method, are employed to quantitatively evaluate agreement of 2D dose distributions between the results measured by the films and calculated by Treatment Planning System(TPS), so as to obtain straightforward presentations, displays and results with high accuracy and reliability.Results Radiotherapy doses measured by developed system agree within 2% with those measured by ionization chamber and VeriSoft Film Dosimetry System, and quantitative evaluation indexes are within 3%.Conclusions The developed system can be used to accurately measure the radiotherapy dose and reliablely make quantitative evaluation for RTP dose verification. |
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