Motion effects in stereotactic body radiotherapy (SBRT) dosimetry of bone metastases: case study using homogeneous and inhomogeneous CIRS phantoms

10th International Seminar on Medical Physics; 1st AMDI International Oncology Symposium

物理学;医药卫生

Asril, Y.S.^1 ; Wibowo, W.E.^2 ; Pawiro, S.A.^1

Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok, West-Java

16424, Indonesia^1

Department of Radiotherapy, Cipto Mangunkusumo General Hospital, Jakarta

10430, Indonesia^2

关键词: Bone metastasis;    Dynamic measurement;    Dynamic motions;    GafChromic films;    Inhomogeneous medium;    Standard deviation;    Static conditions;    Stereotactic body radiotherapy;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/851/1/012027/pdf
DOI  :  10.1088/1742-6596/851/1/012027

学科分类：卫生学

来源: IOP

【 摘 要 】

The Stereotactic Body Radiotherapy (SBRT) for bone metastases has been implemented in radiotherapy center in Indonesia. In this study, we simulated and explored the effect of target motion in SBRT on bone metastases using the homogeneous (002 H9K) and inhomogeneous (002 LFC) CIRS phantom to simulate the presence of inhomogeneous medium near the target, with the holder for chamber. Both phantoms have the interchangeable rod for ionisation chamber, while for TLD and gafchromic EBT3, a holder was devised using Teflon material. In order to evaluate the impact of target motion, the measurements were performed in static and superior-inferior motion with the amplitude of 5, 10, and 20 mm. The measurement in the static condition has the standard deviation of