Effects of high-resolution measurements between different multi-row detectors on volumetric modulated arc therapy patient-specific quality assurance

被引:2
|
作者
Kunii, Y. [1 ]
Tanabe, Y. [2 ]
Higashi, A. [1 ]
Nakamoto, A. [1 ]
Nishioka, K. [1 ]
机构
[1] Tokuyama Cent Hosp, Dept Radiol, 1-1 Kodacho, Yamaguchi, Japan
[2] Okayama Univ, Fac Med, Grad Sch Hlth Sci, Okayama, Japan
来源
INTERNATIONAL JOURNAL OF RADIATION RESEARCH | 2023年 / 21卷 / 03期
关键词
Patient-specific QA; volumetric modulated arc therapy; single measurement; high-resolution measure- ment; radiation treatment planning system; RADIATION-THERAPY; IMRT; VMAT; VERIFICATION; DELIVERY; 2D;
D O I
10.52547/ijrr.21.3.9
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
Background: This study aimed to evaluate the optimal criteria and conditions in which single-measurement (SM) and high-resolution measurement (HM) provide a similar evaluation accuracy for ArcCHECK (AC) and Octavius (OT) detectors. Materials and Methods: In the SM and HM for AC and OT, we evaluated & gamma;-analysis pass-rate differences for various conditions (criteria, calculation grid size, and shift of the isocenter) of 20 patients who received volumetric modulated arc therapy. All results of the & gamma;-analysis pass rate were analyzed using the Anderson-Darling normality test. Results: In the AC detector, an SM with a 1%/1 mm criterion, 1.25 mm calculation grid size, and two standard deviations (2SD) of tolerance showed an evaluation accuracy similar to that of an HM. In the OT detector, an SM with a 2%/2 mm criterion, 2.0 mm calculation grid, and 2SD of tolerance had an evaluation accuracy similar to that of an HM. The & gamma;-pass-rate data of the OT detector for the 3%/3 mm criterion did not follow a normal distribution in both SM and HM. Conclusions: Most high & gamma;-analysis pass rates achieved using inadequate criteria may not detect errors; therefore, accurate evaluation is necessary for optimizing the criteria settings of individual QA devices based on the characteristics and the uncertainties of array detectors. The characteristics of a detector array can be enhanced by evaluating the relationship between SM and HM, which reduces the workload of patient-specific QA.
引用
收藏
页码:413 / 420
页数:8
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