Request of Dose Calculation Method in Arc modulated Radiation Therapy

LI Min; GOU Cheng-jun; WU Zhang-wen; HOU Qing#

doi:10.11804/NuclPhysRev.27.02.218

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Article Navigation > Nuclear Physics Review > 2010 > 27(2): 218-222

LI Min, GOU Cheng-jun, WU Zhang-wen, HOU Qing#. Request of Dose Calculation Method in Arc modulated Radiation Therapy[J]. Nuclear Physics Review, 2010, 27(2): 218-222. doi: 10.11804/NuclPhysRev.27.02.218

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LI Min, GOU Cheng-jun, WU Zhang-wen, HOU Qing#. Request of Dose Calculation Method in Arc modulated Radiation Therapy[J]. Nuclear Physics Review, 2010, 27(2): 218-222. doi: 10.11804/NuclPhysRev.27.02.218

Request of Dose Calculation Method in Arc modulated Radiation Therapy

doi: 10.11804/NuclPhysRev.27.02.218

Key Laboratory for Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China

Received Date: 1900-01-01
Rev Recd Date: 1900-01-01
Publish Date: 2010-06-20

Abstract

In the treatment planning for arcintensitymodulated radiation therapy, because many irradiation directions are involved, the computing time and storage space needed for calculating beamlet dose matrices in optimization is quite heavy. In order to improve the computation efficiency, the simplified dose calculation is often used for the calculation of the dose matrices. Thus, it is deserved to study how this simplification could influence the quality of the treatment plan. In this paper, a simulation and a clinical case are adopted. Using the primary dose calculation model without taking into account the scattering effect to generate the dose matrices of beamlets, the optimization for beam intensity profile are firstly carried out. Then, based on the obtained intensity profile, the dose distributions are recalculated by using the primary dose calculation model and the differential convolution superposition dose calculation model which is more accurate but more time consuming. By comparing dose distributions obtained by this two models, the influence of using simplified model for dose matrix calculation on beam profile optimization is studied. The results demonstrate that when the beam number is large(corresponding to the arcmodulated radiation), using the simplified model for the calculation of dose matrix of beamlets will reduce the quality of dose distribution greatly comparing with the expected dose distribution quality. Thus it is very necessary to correctly take into account the scattering effect in beam profile optimization for the arcintensitymodulated radiation therapy.
- intensity modulated radiation therapy,
- optimization,
- dose calculation model
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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Request of Dose Calculation Method in Arc modulated Radiation Therapy

doi: 10.11804/NuclPhysRev.27.02.218

Key Laboratory for Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China

Received Date: 1900-01-01
Rev Recd Date: 1900-01-01
Publish Date: 2010-06-20

Key words:

Abstract: In the treatment planning for arcintensitymodulated radiation therapy, because many irradiation directions are involved, the computing time and storage space needed for calculating beamlet dose matrices in optimization is quite heavy. In order to improve the computation efficiency, the simplified dose calculation is often used for the calculation of the dose matrices. Thus, it is deserved to study how this simplification could influence the quality of the treatment plan. In this paper, a simulation and a clinical case are adopted. Using the primary dose calculation model without taking into account the scattering effect to generate the dose matrices of beamlets, the optimization for beam intensity profile are firstly carried out. Then, based on the obtained intensity profile, the dose distributions are recalculated by using the primary dose calculation model and the differential convolution superposition dose calculation model which is more accurate but more time consuming. By comparing dose distributions obtained by this two models, the influence of using simplified model for dose matrix calculation on beam profile optimization is studied. The results demonstrate that when the beam number is large(corresponding to the arcmodulated radiation), using the simplified model for the calculation of dose matrix of beamlets will reduce the quality of dose distribution greatly comparing with the expected dose distribution quality. Thus it is very necessary to correctly take into account the scattering effect in beam profile optimization for the arcintensitymodulated radiation therapy.

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