Three-dimensional gamma passing rate in different dose ranges for stereotactic body radiotherapy(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2021年第12期
- Page:
- 1508-1517
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Three-dimensional gamma passing rate in different dose ranges for stereotactic body radiotherapy
- Author(s):
- LIU Ying1; SUN Haitao2; DENG Qingping3; YUAN Ling1; ZHANG Hongli1; XU Yaoyao1; ZHANG Xiaopeng1; WANG Xin1; SHI Xingyuan1
- 1. Department of Radiotherapy, the Fifth Affiliated Hospital of Guangzhou Medical University, Guangzhou 510700, China 2. Department of Radiotherapy, Zhongshan Hospital of TCM, Zhongshan 528400, China 3. Department of Equipment, Huizhou Municipal Central Hospital, Huizhou 516001, China
- Keywords:
- Keywords: stereotactic body radiotherapy gamma passing rate dose verification water phantom
- PACS:
- R815
- DOI:
- DOI:10.3969/j.issn.1005-202X.2021.12.010
- Abstract:
- Abstract: Objective To explore the characteristics and sensitiveness of gamma passing rate in stereotactic body radiotherapy (SBRT) by analyzing gamma passing rate for stereotactic radiotherapy (SBRT) verification plan. Methods A total of 38 SBRT plans were transplanted to the OCTAVIUS phantom of PTW, and the two-dimensional dose collected by PTW 1600SRS was reconstructed into three-dimensional dose using Verisoft. The gamma passing rates between three-dimensional dose reconstructed by Verisoft (Dp) and that calculated by treatment planning system (Dt) were analyzed by Matlab. In addition, the gamma passing rates under different thresholds and in different dose ranges were analyzed for testing the sensitiveness of gamma passing rate to dose increase in different dose ranges. Results The gamma passing rate at 3 mm criterion was higher than 90% when the threshold was 10%. The gamma passing rates at different criteria were in the same tread. At 3%/3 mm criterion, the highest gamma passing rate was found in the 11%-20% dose range. For all criteria, the mean gamma passing rate in dose range higher than 51% (inside radiation area) was lower than 90% and changed significantly. In dose range lower than 51% (outside radiation area), the gamma passing rate was highly sensitive to dose increase. Conclusion The smaller the threshold is, the higher the gamma passing rate is. The gamma passing rate of low-dose area is higher than that of high-dose area, and gamma passing rate is more sensitive to the dose increase in low-dose area.
Last Update: 2021-12-24