Semester Award Granted

Spring 2025

Submission Date

May 2025

Document Type

Thesis

Degree Name

Professional Science Masters (PSM)

Thesis/Dissertation Advisor [Chair]

Silvia Pella,

Thesis/Dissertation Co-Chair

Theodora Leventouri

Abstract

The primary objective of this study was to evaluate the patient-specific quality assurance (PSQA) performance for various disease sites treated with the Radixact machine using Gamma (γ) passing rate analysis (%GP) as per AAPM TG-218.

This study analyzed 22 PSQA plans executed on a Radixact machine using ArcCheck phantom and delivery analysis (DA) software. The %GP was calculated using a 3% dose difference (DD), a 2 mm distance-to-agreement (DTA), and a 10% threshold. A passing criterion of ≥95% was applied for PSQA evaluation.

The %GP was analyzed for all sites. The %GP (2D) on the ArcCheck phantom mean γ passing rate with variability was (97.12±2.63%), while the %GP (3D) rate for DA was 100%.

For DA, the %GP was 100% because it only considers the MLC-LOTs patterns, not plan parameters, to compute the delivered versus planned dose. Investigations should be required to recalibrate the output of the MVCT diode array.

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