Abstract
The sensitivity of the ArcCHECK 3D dosimeter in detecting VMAT delivery errors has been investigated. Dose and leaf positional errors of different magnitudes were introduced to whole arc and individual control points (CPs) of a simple open arc VMAT plan. The error introduced and error free plans were delivered and measured using the ArcCHECK device. The measured doses were compared against the treatment planning system calculated doses using gamma (γ) criteria with 2%/2mm and 3%/3mm tolerance levels. ArcCHECK effectively detected the dose errors resulting from MLC leaf positioning errors in limited CPs and Whole arc. For errors introduced to MU, ArcCHECK effectively detected the MU delivery errors in whole arc but not the MU errors introduced to CPs in integrated dose comparison.
Highlights
Modern radiotherapy techniques are highly complex in both planning and treatment delivery
In this study we investigated the ability of the ArcCHECK to detecting Volumetric Modulated Arc Therapy (VMAT) delivery errors using integrated dose measurements
The ArcCHECK dosimeter was shown to effectively detect dose errors resulting from MLC leaf positioning errors
Summary
Modern radiotherapy techniques are highly complex in both planning and treatment delivery. The Volumetric Modulated Arc Therapy (VMAT) technique has been recently introduced and follows this trend [1, 2]. The complexity involved in the planning and delivery stages of VMAT necessitates the need for pretreatment plan specific dose verification using 3D dose measurements [3]. In recent years at least two electronic dosimeters, which enable semi 3D dose measurements, have been commercially introduced [5, 6]. Feygelman et al [6] studied the characteristics of the ArcCHECK device extensively and reported its suitability and limitations for VMAT dose verification. Yang et al studied the sensitivity of ArcCHECK in detecting systematic MLC leaf positioning error in Intensity Modulated Radiation Therapy (IMRT) and VMAT delivery by introducing errors to IMRT beams and VMAT arc [7]. In this work we have investigated the sensitivity of ArcCHECK in detecting MLC leaf
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