Evaluation of 3D pre-treatment verification for volumetric modulated arc therapy plan in head region

13th South-East Asian Congress of Medical Physics 2015

物理学;医药卫生

Ruangchan, S.^1 ; Oonsiri, S.^1 ; Suriyapee, S.^2

Division of Therapeutic Radiology and Oncology, Department of Radiology, King Chulalongkom Memorial Hospital, Thai Red Cross Society, Bangkok, Thailand^1

Department of Radiology, Faculty of Medicine, Chulalongkom University, Bangkok, Thailand^2

关键词: Calculation software;    Dose distributions;    Dose verification;    Organ at risks;    Three dimensions;    Treatment planning;    Verification plans;    Volumetric modulated arc therapy;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/694/1/012011/pdf
DOI  :  10.1088/1742-6596/694/1/012011

学科分类：卫生学

来源: IOP

【 摘 要 】

The development of pre-treatment QA tools contributes to the three dimension (3D) dose verification using the calculation software with the measured planar dose distribution. This research is aimed to evaluate the Sun Nuclear 3DVH software with Thermo luminescence dosimeter (TLD) measurement. The two VMAT patient plans (2.5 arcs) of 6 MV photons with different PTV locations were transferred to the Rando phantom images. The PTV of the first plan located in homogeneous area and vice versa in the second plan. For treatment planning process, the Rando phantom images were employed in optimization and calculation with the PTV, brain stem, lens and TLD position contouring. The verification plans were created, transferred to the ArcCHECK for measurement and calculated the 3D dose using 3DVH software. The range of the percent dose differences in both PTV and organ at risk (OAR) between TLD and 3DVH software of the first and the second plans were -2.09 to 3.87% and -1.39 to 6.88%, respectively. The mean percent dose differences for the PTV were 1.62% and 3.93% for the first and the second plans, respectively. In conclusion, the 3DVH software results show good agreement with TLD when the tumor located in the homogeneous area.