| MA Jin-li,JIANG Guo-liang,FU Xiao-long.Establishment of dosimetric verification technique in phantom for intensity-modulated radiotherapy[J].Chinese Journal of Radiological Medicine and Protection,2007,27(1):80-83 |
| Establishment of dosimetric verification technique in phantom for intensity-modulated radiotherapy |
| Received:February 05, 2006 |
| DOI： |
| KeyWords:IMRT Quality assurance Absolute dose verification Film dosimetry |
| FundProject: |
| Author Name | Affiliation | | MA Jin-li | Department of Radiation Oncology, Cancer Hospital, Fudan University, Shanghai 200032, China | | JIANG Guo-liang | Department of Radiation Oncology, Cancer Hospital, Fudan University, Shanghai 200032, China | | FU Xiao-long | Department of Radiation Oncology, Cancer Hospital, Fudan University, Shanghai 200032, China | | 吴开良 | Department of Radiation Oncology, Cancer Hospital, Fudan University, Shanghai 200032, China | | 李龙根 | Department of Radiation Oncology, Cancer Hospital, Fudan University, Shanghai 200032, China |
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| Abstract:: |
| Objective To develop the in-phantom dosimetric verification technique for intensity-modulated radiotherapy. Methods An IMRT plan for a NPC patient was designed and transferred to Med-Tech IMRT phantom to create a hybrid phantom plan. The dose at the point of interest was measured with the Pinpoint chamber and then compared with the calculated value. The film dosimeter including Kodak EDR2 film was used to measure planar dose distribution and the delivered dose distribution was compared with the planned one. The verification results were assessed by composite criterion. Results The measured point dose is 121.5 cGy, which is less than the computed mean dose by 4%. The distance from the region of high dose to that of high gradient is within 4 mm. A profile through the registered plan and film images showed a good agreement between the plan and the film. The superimposed isodose lines for the film image and the axial image from the hybrid plan overlaid well at each isodose level. The point dose in the high dose and low gradient region as well as the distance from the high dose to high gradient region agreed well in accordance with the corresponding criterion of accuracy. Conclusions The IMRT in-phantom dosimetric verification technique for individual patient has been established. The registration, normalization and evaluation of dose have been optimized. |
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