Abstract
In this paper the sensitivity of an Electronic Portal Imaging Device (EPID) to detecting introduced Volumetric Arc Therapy (VMAT) treatment errors was studied using the Collapsed Arc method. Two clinical Head and Neck (H&N) and Prostate treatment plans had gantry dependent dose and MLC errors introduced to the plans. These plans were then delivered to an Elekta Synergy Linear Accelerator EPID and compared to the original treatment planning system Collapsed Arc dose matrix. With the Collapsed Arc technique the EPID was able to detect MLC errors down to 2mm and dose errors of down to 3% depending on the treatment plan complexity and gamma tolerance used.
Highlights
Modern radiotherapy techniques are increasingly complex in both planning and treatment delivery, with the Volumetric Modulated Arc Therapy (VMAT) technique following this trend [1,2,3]
The technique allows the measurement of the VMAT arc using gantry mounted devices, or detectors which are always perpendicular to the treatment beam, but is not able to detect delivery errors from gantry angle position
In this study we investigate the sensitivity of the collapsed arc technique to detect deliberately-introduced errors to VMAT treatment plans measured using the Electronic Portal Imaging Device (EPID)
Summary
Modern radiotherapy techniques are increasingly complex in both planning and treatment delivery, with the Volumetric Modulated Arc Therapy (VMAT) technique following this trend [1,2,3]. The high complexity demands rigorous commissioning and pre-treatment plan-specific dose verification using 3D dose measurements [4, 5] All such radiotherapy techniques are dependent on strict machine tolerances to ensure consistent and accurate dose delivery [6, 7]. Errors due to both MLC [8] and dose differences [9] have been investigated and different combinations of tools and commercial QA devices have been compared to varying extents [10, 11] for use in rotational therapies.
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