Abstract
Development of a software tool to ease the Intensity Modulated Radiation Therapy (IMRT) pre-treatment Quality Assurance process is presented in this study. The delivery of IMRT involves equipment from multiple vendors. The limitations of the equipment involved in this chain will impact on the best choice of equipment. This often results in the user needing to use multiple pieces of equipment before determining the most appropriate choices to optimise the QA work flow. This is a time consuming process and potentially delays the start of patient treatment. Software was developed in-house to assist the decision making process, validating deliverability of beam delivery parameters and selecting appropriate detector systems and configuration for QA of IMRT plans. The software has been demonstrated to be accurate and improves efficiency of IMRT pre-treatment QA.
Highlights
Intensity Modulated Radiation Therapy (IMRT) involves equipment from multiple vendors at various stages of the treatment course such as treatment planning, Quality Assurance (QA) and treatment delivery
In this study we present an in-house software tool that identifies the presence of undeliverable segments in an IMRT beam
The patient details, plan details, presence of total number of IMRT and setup fields and presence of total number of prescription and identification of correct treatment delivery machine within the selected clinic have been accurately identified by the software (Plan details section of Figure 6)
Summary
Intensity Modulated Radiation Therapy (IMRT) involves equipment from multiple vendors at various stages of the treatment course such as treatment planning, Quality Assurance (QA) and treatment delivery. Dose verification of IMRT plans is performed using a combination of 1D, 2D or 3D detector systems In this process the patient plan is recalculated on the phantom image dataset and the phantom and detector position is optimised to cover the entire treatment field. In the clinic routine pre-treatment verification is optimised to simple measurement geometry for efficient workflow This optimisation process should be supported with sufficient experience and confidence, backed by detailed dose verification, on the Treatment planning System (TPS) and delivery system[2]. Further occasionally TPSs calculated IMRT field segments violate MLC motion limitations Often this is not identified until the pre-treatment verification process causing delay in both QA and the initiation of patient treatment. The developed software predicts the appropriate EPID position configuration by considering the IMRT field size and vendor specific position limitations
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