研究生: |
蔡雨恬 Yu-Tien Tsai |
---|---|
論文名稱: |
以蒙地卡羅方式建構諾力刀系統及微多葉式準直儀並探討其劑量特性 Monte Carlo simulation of a Novalis System and equipped m3 mMLC using BEAMnrc07 |
指導教授: |
董傳中
Chuan-Jong Tung 李宗其 Chung-Chi Lee 趙自強 Tsi-Chian Chao |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
原子科學院 - 生醫工程與環境科學系 Department of Biomedical Engineering and Environmental Sciences |
論文出版年: | 2008 |
畢業學年度: | 96 |
語文別: | 中文 |
論文頁數: | 116 |
中文關鍵詞: | 蒙地卡羅方式 、微多葉式準直儀 、諾力刀系統 |
外文關鍵詞: | Monte Carlo simulation, m3 mMLC, Novalis system |
相關次數: | 點閱:2 下載:0 |
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為提供研究者進行強度調控放射治療之劑量分佈模擬,本研究利用蒙地卡羅模擬程式BEAMnrc建構直線加速器諾力刀系統(Novalis,BrainLab/Varian)及其配備之微多葉式準直儀(m3),並準確地追蹤射束經過機頭各構造時粒子的遷移與作用,包括多葉式準直儀的圓形葉片尖端構造(rounded-leaf end)、葉片側面凹凸齒狀構造(tongue and groove)等。我們利用Varian 600C/D參考手冊並加以微調以建構諾力刀系統靶至準直儀的部份,並選擇最適當的入射電子參數組合為6.0 MeV、FWHM(R)為0 mm、FWHM(E)為0.2 MeV、角度分佈1.5°。
m3構件模組的部分則使用BrainLab m3設計圖設定包括葉片上緣位置、葉片尖端、葉片寬度、凹凸齒狀構造、y方向起始位置等參數,並比較模擬及測量之alternate block field劑量剖面,以設定適當的葉片間空隙。建構完成之m3構件模組以alternate block field以及block field進行物理及劑量特性的驗證,前者之差異約有91% 於2% / 1 mm之內,後者之差異則約有94% 於2% / 1 mm之範圍內,皆與文獻相近。
1. Liu HH, Verhaegen F, Dong L. A method of simulating dynamic multileaf collimators using Monte Carlo techniques for intensity-modulated radiation therapy. Physics in Medicine and Biology 2001;46.
2. Heath E, Seuntjens J. Development and validation of a BEAMnrc component module for accurate Monte Carlo modelling of the Varian dynamic Millennium multileaf collimator. Physics in Medicine and Biology 2003;48:4045-4063.
3. Tyagi N, Moran JM, Litzenberg DW, et al. Experimental verification of a Monte Carlo-based MLC simulation model for IMRT dose calculation. Medical Physics 2007;34:651-663.
4. Kim JO, Siebers JV, Keall PJ, et al. A Monte Carlo study of radiation transport through multileaf collimators. Medical Physics 2001;28:2497-2506.
5. Pawlicki T, Ma CMC. Monte Carlo simulation for MLC-based intensity-modulated radiotherapy. Medical Dosimetry 2001;26:157-168.
6. Belec J, Patrocinio H, Verhaegen F. Development of a Monte Carlo model for the Brainlab microMLC. Physics in Medicine and Biology 2005;50:787-799.
7. Aaronson RF, DeMarco JJ, Chetty IJ, et al. A Monte Carlo based phase space model for quality assurance of intensity modulated radiotherapy incorporating leaf specific characteristics. Medical Physics 2002;29:2952-2958.
8. Chetty I, DeMarco JJ, Solberg TD. A virtual source model for Monte Carlo modeling of arbitrary intensity distributions. Medical Physics 2000;27:166-172.
9. http://www.novalis-surgery.com.
10. Rogers DWO, Walters BRB, Kawrakow I. BEAMnrc Users Manual. NRCC Report PIRS-0509(A)revK 2006.
11. Ma C-M, Rogers DWO. BEAMDP Users Manual. NRCC Report PIRS-0509(C)revA 2006.
12. Walters BRB, Kawrakow I, Rogers DWO. DOSXYZnrc Users Manual. NRCC Report PIRS-794revB 2006.
13. Kawrakow I, Rogers DWO, Walters BRB. Large efficiency improvements in BEAMnrc using directional bremsstrahlung splitting. Medical Physics 2004;31:2883-2898.
14. Varian Oncology Systems: Monte Carlo Project.
15. Pena J, Gonzalez-Castano DM, Gomez F, et al. Automatic determination of primary electron beam parameters in Monte Carlo simulation. Medical Physics 2007;34:1076-1084.
16. Pena J, Franco L, Gomez F, et al. Commissioning of a medical accelerator photon beam Monte Carlo simulation using wide-field profiles. Physics in Medicine and Biology 2004;49:4929-4942.
17. Sheikh-Bagheri D, Rogers DWO, Ross CK, et al. Comparison of measured and Monte Carlo calculated dose distributions from the NRC linac. Medical Physics 2000;27:2256-2266.
18. Aljarrah K, Sharp GC, Neicu T, et al. Determination of the initial beam parameters in Monte Carlo linac simulation. Medical Physics 2006;33:850-858.
19. Keall PJ, Siebers JV, Libby B, et al. Determining the incident electron fluence for Monte Carlo-based photon treatment planning using a standard measured data set. Medical Physics 2003;30:574-582.
20. Tzedakis A, Damilakis JE, Mazonakis M, et al. Influence of initial electron beam parameters on Monte Carlo calculated absorbed dose distributions for radiotherapy photon beams. Medical Physics 2004;31:907-913.
21. Sheikh-Bagheri D, Rogers DWO. Sensitivity of megavoltage photon beam Monte Carlo simulations to electron beam and other parameters. Medical Physics 2002;29:379-390.
22. 彭宇民. Determination of initial electron parameters for Monte Carlo simulation of Varian 21EX 6MV photon beams. 2006.
23. Low DA, Harms WB, Mutic S, et al. A technique for the quantitative evaluation of dose distributions. Medical Physics 1998;25:656-661.
24. Harms Sr WB, Low DA, Wong JW, et al. A software tool for the quantitative evaluation of 3D dose calculation algorithms. Medical Physics 1998;25:1830-1836.