Evaluation of a two-dimensional diode array for patient-specific quality assurance of HyperArc

被引:8
|
作者
Popple, Richard A. [1 ]
Sullivan, Rodney J. [1 ]
Yuan, Yuan [1 ]
Wu, Xingen [1 ]
Covington, Elizabeth L. [1 ]
机构
[1] Univ Alabama Birmingham, Dept Radiat Oncol, 176F RM 2240H,619 19TH St S,1720 2nd Ave South, Birmingham, AL 35249 USA
来源
JOURNAL OF APPLIED CLINICAL MEDICAL PHYSICS | 2021年 / 22卷 / 12期
关键词
dosimetry; quality assurance; radiosurgery; ASTRO PRACTICE GUIDELINE; PLAN QUALITY; AMERICAN SOCIETY; SINGLE-ISOCENTER; FILM DOSIMETRY; RADIOLOGY ACR; RADIOSURGERY; DELIVERY; COLLEGE;
D O I
10.1002/acm2.13438
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
Purpose To evaluate a two-dimensional diode array for patient-specific quality assurance of VMAT stereotactic radiosurgery (SRS) plans. Methods The diode array, an SRS MapCHECK (SRSMC), was composed of a 77 mm x77 mm face-centered array having a spacing of 2.47 mm. Sixty SRS plans were selected from our clinical database, 30 for treatment of a single target and 30 for multiple targets. The target sizes ranged from 2.4 mm to 44.7 mm equivalent diameter (median 8.7 mm). The plans were delivered to the diode array. For multiple target plans, two measurements were obtained at two locations, one corresponding to the largest target and the other to the smallest target. Gamma using a 3%/1 mm criteria and the dose to the center diode were compared with radiochromic film (RCF). Dose to selected regions of the detector electronics was calculated. Results The mean difference between the center diode and RCF was -1.2%. For a threshold of at least 95% of detectors/pixels having gamma < 1 for a 3%/1 mm criteria, SRSMC and RCF gave consistent results for 79 of the 90 measurements. For plans with an arc having a patient support angle of 90 degrees or 270 degrees, the median dose to the electronics was 0.65% of the prescription dose. Conclusions SRSMC is an efficient tool for accurate patient-specific quality assurance of VMAT single and multiple target radiosurgery, yielding similar clinical decisions as radiochromic film.
引用
收藏
页码:203 / 210
页数:8
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