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

Kunii, Y.; Tanabe, Y.; Higashi, A.; Nakamoto, A.; Nishioka, K.

doi:10.61186/ijrr.21.3.413

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Volume 21, Issue 3 (7-2023) Int J Radiat Res 2023, 21(3): 413-419 | Back to browse issues page

‎ 10.61186/ijrr.21.3.413

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Kunii Y, Tanabe Y, Higashi A, Nakamoto A, Nishioka K. Effects of high-resolution measurements between different multi-row detectors on volumetric modulated arc therapy patient-specific quality assurance . Int J Radiat Res 2023; 21 (3) :413-419
URL: http://ijrr.com/article-1-4849-en.html

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

Y. Kunii

, Y. Tanabe

, A. Higashi

, A. Nakamoto

, K. Nishioka

Faculty of Medicine, Graduate School of Health Sciences, Okayama University, Shikata, Kita, Okayama, Japan , tanabey@okayama-u.ac.jp

Abstract: (2144 Views)

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 γ-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 γ-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 γ-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 γ-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.

Keywords: Patient-specific QA, volumetric modulated arc therapy, single measurement, high-resolution measurement, radiation treatment planning system.

Full-Text [PDF 1001 kb] (1005 Downloads)

Type of Study: Original Research | Subject: Radiation Biology

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