Individual volume-based 3D gamma indices for pretreatment VMAT QA
| Autor: | Congying Xie, Yongqiang Zhou, Ce Han, Xiaomin Zheng, Xiance Jin, Fu Jin, Zhenxiang Deng, Jinling Yi |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Organs at Risk
percentage gamma passing rate 87.53.Kn Planning target volume quality assurance Dose distribution 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Area under curve Humans Radiation Oncology Physics Arc therapy Medicine Radiology Nuclear Medicine and imaging volumetric‐modulated arc therapy Radiometry Radiation treatment planning Instrumentation Radiation percentage dosimetric errors business.industry Radiotherapy Planning Computer-Assisted Radiotherapy Dosage 87.55.D 87.55.dk Gamma analysis Gamma Rays 030220 oncology & carcinogenesis Feasibility Studies Radiotherapy Intensity-Modulated 87.55.x Nuclear medicine business Quality assurance Volume (compression) |
| Zdroj: | Journal of Applied Clinical Medical Physics |
| ISSN: | 1526-9914 |
| DOI: | 10.1002/acm2.12062 |
| Popis: | Although gamma analysis is still a widely accepted quantitative tool to analyze and report patient‐specific QA for intensity‐modulated radiotherapy (IMRT) and volumetric‐modulated arc therapy (VMAT), the correlation between the 2D percentage gamma passing rate (%GP), and the clinical dosimetric difference for IMRT and VMAT has been questioned. The purpose of this study was to investigate the feasibility of individual volume‐based 3D gamma indices for pretreatment VMAT QA. Percentage dosimetric errors (%DE) of dose‐volume histogram metrics (includes target volumes and organ at risks) between the treatment planning system and QA‐reconstructed dose distribution, %GPs for individual volume and global gamma indices, as well their correlations and sensitivities were investigated for one‐ and two‐arc VMAT plans. The %GPs of individual volumes had a higher percent of correlation with individual 15 %DE metrics compared with global %GPs. For two‐arc VMAT at 2%/2 mm, 3%/3 mm, and 4%/4 mm criteria, individual volume %GPs were correlated with 9, 12, and 9 out of 15 %DE metrics, while global %GPs were correlated with only 2 out of 15 %DE metrics, respectively. For one‐arc VMAT at 2%/2 mm, 3%/3 mm, and 4%/4 mm criteria, individual volume %GPs were correlated with 18, 16, and 13 out of 23 %DE metrics, and global %GPs were correlated with 19, 12, and 1 out 23 %DE metrics, respectively. The area under curves (AUC) of individual volume %GPs were higher than those of global %GPs for two‐arc VMAT plans, but with mixed results for one‐arc VMAT plans. In a conclusion, the idea of individual volume %GP was created and investigated to better serve for VMAT QA and individual volume‐based %GP had a higher percent of correlation with DVH 15 %DE metrics compared with global %GP for both one‐ and two‐arc VMAT plans. |
| Databáze: | OpenAIRE |
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