| LI Qi-lin,DENG Xiao-wu,CHEN Li-xin,HUANG Xiao-yan,HUANG Shao-min.The application of a 2D diode array in verifying the composite dose distribution of intensity modulated radiation therapy[J].Chinese Journal of Radiological Medicine and Protection,2011,31(3):359-362 |
| The application of a 2D diode array in verifying the composite dose distribution of intensity modulated radiation therapy |
| Received:December 10, 2010 |
| DOI：10.3760/cma.j.issn.0254-5098.2011.03.030 |
| KeyWords:Intensity modulated radiation therapy Composite dose distribution 2-dimensional diode array Dose verification |
| FundProject: |
| Author Name | Affiliation | | LI Qi-lin | Department of Radiation Oncology, Sun Yat-sen University Cancer Center, Guangzhou 510060, China | | DENG Xiao-wu | Department of Radiation Oncology, Sun Yat-sen University Cancer Center, Guangzhou 510060, China | | CHEN Li-xin | Department of Radiation Oncology, Sun Yat-sen University Cancer Center, Guangzhou 510060, China | | HUANG Xiao-yan | Department of Radiation Oncology, Sun Yat-sen University Cancer Center, Guangzhou 510060, China | | HUANG Shao-min | Department of Radiation Oncology, Sun Yat-sen University Cancer Center, Guangzhou 510060, China |
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| Abstract:: |
| Objective In order to explore the ways of reflecting the dose distribution in the implementation of the of IMRT (intensity modulated radiation therapy),a 2D diode array (2D-DA) was used in verifying the composite dose distribution of IMRT plans in the way of multi-gantry-angle composite (MGAC). Methods IMRT quality assure (QA) plans of 27 patients, based on the 2D-DA and solid water phantom, were designed and verified in two ways of single-gantry-angle composite (SGAC) and MGAC verifications. The comparison and analyzation of the dose distributions of the TPS calculation and the measurement of the 2D-DA were done. Results (1) When the beam central axes were not superposed with the detectors'plane of the 2D-DA, the verification passrate of SGAC and MGAC planar dose distribution of 27 patients'IMRT plan were 94.56%±4.28% and 94.81%±3.80% (the criteria: r value,3 mm/3%), respectively. There was no statistical difference between the results of two sets (t=-0.213, P >0.05). (2) When one of the beam central axes was superposed with the detectors'plane of the 2D-DA, the verification passrate of MGAC planar dose distribution were 79.72%±12.77%. Conclusions Using the 2D-DA with a proper phantom, there was no statistical difference in the SGAC and MGAC verifications of IMRT plans when the beam central axes were not superposed with the detectors'plane. However, the MGAC dose distribution can provide more about the clinical dosimetry, and the errors in the implementation of the of IMRT were easier located. |
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