Validation of a digital method for patient-specific verification of VMAT treatment using a 2D ionisation detector array

U’wais, Fatima Adel; Radzi, Yasmin; Rizan, Naslinda Noor; Zin, Hafiz M.

doi:10.1016/j.radphyschem.2022.110536

Cited by 1 publication

(1 citation statement)

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“…While simple ion chamber measurements can provide one-dimensional (1D) information, it may not be sufficient for identifying errors in complex volumetric-modulated arc therapy (VMAT) and intensity-modulated radiation therapy (IMRT) plans. To obtain two-dimensional (2D) or three-dimensional (3D) dose information, many commercial array-based detectors are available, [3][4][5][6][7] equipped with built-in analyzing software. The planned dose and measured dose can be compared using the gamma index, quantifying the gamma passing rate (GPR) in percentage.…”

Section: Introductionmentioning

confidence: 99%

Wobbling nature of gamma passing rate as a function of calibration field sizes in patient-specific quality assurance

Raj,

Sundaram,

Godson

et al. 2024

J Radiother Pract

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Purpose: This study aimed to investigate the influence of calibration field size on the gamma passing rate (GPR) in patient-specific quality assurance (PSQA). Methods: Two independent detectors, PTW OCTAVIUS 4D (4DOCT) and Arc Check, were utilised in volumetric modulated arc therapy plans for 26 patients (14 with Arc Check and 12 with 4DOCT). Plans were administered using Varian Unique machine (with 4DOCT) and Varian TrueBeam (with Arc Check), each employing different calibration factors (CFs): 4 × 4, 6 × 6, 8 × 8, 10 × 10, 12 × 12 and 15 × 15 cm2 field sizes. Gamma analysis was conducted with 2%2mm, 2%3mm and 3%3mm gamma criteria. Results: GPR exhibited variations across different CFs. GPR demonstrated an increasing trend below 10 × 10 cm² CFs, while it displayed a decreasing trend above 10 × 10 cm². Both detectors exhibited similar GPR patterns. The correlation between 4DOCT and Arc Check was strong in tighter criteria (2%2mm) with an R² value of 0·9957, moderate criteria (2%3mm) with an R² value of 0·9868, but reduced in liberal criteria (3%3mm) with an R² value of 0·4226. Conclusion: This study demonstrates that calibration field sizes significantly influence GPR in PSQA. This study recommends the plan specific calibration field must obtain to calibrate the QA devices for modulated plans.

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Section: Introductionmentioning

confidence: 99%