| ZHANG Shu-xu,ZHOU Ling-hong,YANG Jun,CHEN Guang-jie,YU Hui,LIN Sheng-qu,WANG Shi-qin.Simulation and verification of dose distribution of cycle motion target[J].Chinese Journal of Radiological Medicine and Protection,2010,30(2):195-198 |
| Simulation and verification of dose distribution of cycle motion target |
| Received:April 15, 2009 |
| DOI： |
| KeyWords:Respiration MatriXX Lung tumour Radiotherapy Dose calculation of motion target |
| FundProject:广东省科技计划项目(2007B031509009); 广州市属高校科技计划项目(08A008) |
|
| Hits: 3038 |
| Download times: 2201 |
| Abstract:: |
| Objective To simulate the dose distribution of the cycle motion target based on the dose matrix superposing method, and to verify the dose distribution.Methods A 2D air vented ionization chamber array MatriXX system and a cycle motion platform were used to measure 2D dose distribution of static and cycle motion target irradiated by IMRT segment beams. According to the features of the cycle motion target, a dose matrix superposing method was put forward, and the corresponding simulation program was developed by applying Matlab 7.0 software tools. The dose distributions of cycle motion target with different amplitudes (±5, ±10, ±15mm) were calculated through the simulation program.Results The deviation between the measured dose of static target and the calculated dose of cycle motion target was less than 1% at the central area. Compared with the measured dose distribution of static target, the calculated high dose area of the motion target was shrunk inward and the low dose area was extended outward, but the area of 50% isodose changed insignificantly. The calculated and measured off-axis ratios (OAR) of the cycle motion target were almost identical at motion direction. There was only imperceptible deviation in the low dose area (less than 10%) out of field.Conclusions The dose matrix superposing method can be applied to precisely calculate the dose distribution of cycle motion target. |
| HTML View Full Text View/Add Comment Download reader |
| Close |
|
|
|
