| ZHANG Wei-jun,CHEN Xi-meng,CAO Ji-sheng,et al.Application of CT values in calculation of proton incident energy in proton treatment planning system[J].Chinese Journal of Radiological Medicine and Protection,2010,30(4):460-463 |
| Application of CT values in calculation of proton incident energy in proton treatment planning system |
| Received:July 07, 2009 |
| DOI：10.3760/cma.j.issn.0254-5098.2010.04.025 |
| KeyWords:Proton treatment planning system Proportional coefficient of range (Ci) CT value Fitting function Equivalent range in water |
| FundProject: |
| Author Name | Affiliation | E-mail | | ZHANG Wei-jun | Institute for Nuclear Scientific and Technology of Lanzhou University, Lanzhou 730000, China | | | CHEN Xi-meng | Institute for Nuclear Scientific and Technology of Lanzhou University, Lanzhou 730000, China | chenxm@lzu.edu.cn | | CAO Ji-sheng | 中国疾病预防控制中心辐射防护与核安全医学所 | | | PENG Hong | 北京大学第三医院 | | | YANG Shao-bo | Institute for Nuclear Scientific and Technology of Lanzhou University, Lanzhou 730000, China | | | JIA Juan-juan | Institute for Nuclear Scientific and Technology of Lanzhou University, Lanzhou 730000, China | | | WU Jian-hui | Institute for Nuclear Scientific and Technology of Lanzhou University, Lanzhou 730000, China | | | TANG Xing-hua | Institute for Nuclear Scientific and Technology of Lanzhou University, Lanzhou 730000, China | |
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| Abstract:: |
| Objective To explore the application of CT value in calculating the proton incident energy in proton treatment planning system. Methods Bethe-Block formula and the formula for calculating the proton range were analyzed to study the correlation of the range of proton beam (70-250 MeV) between a variety of radiation equivalent material and water. Procedure of Monte Carlo SRIM2008 was used to verify the possibility of a constant proportional coefficient of range(Ci). The proportional coefficient (Ci) of range in radiation-equivalent material and the CT value were fitted by using Origin 8.0 software to study the functional relation of CT value and Ci. The actual range of proton was equivalent to a range of water and incident proton energy could be calculated. Results There was a constant range of Ci of proton beam (70-250 MeV) between a variety of radiation equivalent material and water. There was a functional relation between CT value and Ci (r = 0.999). The actual range of proton in radiation equivalent material can be equivalent to a range of the water.Conclusions CT values and a range of proportional coefficient (Ci), and the actual required range of the tumor could be used to accurately calculate the water equivalent range, and the incident proton energy to the position of Bragg peak. A new exploration for using CT technology in proton treatment planning system could be obtained. |
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