Verification of the delivered patient radiation dose for non‐coplanar beam therapy

Abstract

Purpose: There is an increased interest in using non-coplanar beams for radiotherapy, including SBRT and SRS. This approach can significantly reduce doses to organs-at-risk, however, it requires stringent quality assurance, especially when a dynamic treatment couch is used. In this work, new functionality that allows using non-coplanar beam arrangements in addition to conventional coplanar beams was added and validated to the previously developed in vivo dose verification system.Methods: The existing program code was modified to manage the additional treatment couch parameters: angle and positions. Ten non-coplanar test plans that use a static couch were created in the treatment planning system. Also, two plans that use a dynamic treatment couch were created and delivered using Varian Developer mode, since the treatment planning system does not support a dynamic couch. All non-coplanar test trajectories were delivered on a simple geometric phantom, using an Edge linear accelerator (Varian Medical Systems) with the megavoltage imager deployed and acquiring megavoltage transmission images that were used to calculate the delivered 3D dose distributions in the phantom with the updated dose calculation algorithm. The reconstructed dose distributions were compared using the 3D chi-comparison test with 2%/2mm tolerances to the corresponding reference dose distributions obtained from the treatment planning system. Results:The chi-comparison test resulted in at least a 97.0% pass rate over the entire 3D volume for all tested trajectories. For static gantry, static couch noncoplanar fields, and non-coplanar arcs using dynamic couch the pass rates observed were at least 98%, while for the static couch, non-transverse coplanar arc fields, pass rates were at least 97%.Conclusions: A model-based 3D dose calculation algorithm has been extended and validated for a variety of non-coplanar beam trajectories of different complexities.This system can potentially be applied for quality assurance of treatment delivery systems that use complex, non-coplanar beam arrangements.

EPID-based in vivo dosimetry – new developments and applications

“…The CCMB inhouse method was validated for in vivo dose reconstruction on 4D CT data sets using a dynamic thorax phantom and lung tumour insert [36] showing a gamma pass rate (3%, 3 mm DTA) within the PTV of >99.3%. The method was also validated for non-coplanar beam configurations such as those used in stereotactic radiosurgery (SRS) brain treatments [37], using an IMRT QA phantom with irradiations delivered via XML scripting in research mode on a TrueBeam linac (Varian Medical Systems, Palo Alto, CA), achieving gamma pass rates (2%, 2 mm DTA) >97%.…”

End-to-End QA in Radiation Therapy Quality Management

“…The uncertainty in the tools available for early IMRT techniques motivated proponents to contend that it was vital to do full 3D dose assessment of the deliveries during a clinic's IMRT commissioning and, perhaps, even for every patient before treatment [46,51] (and encouraged the development of the IC3Ddose community). With time the treatment planning algorithms were better validated, the treatment unit control systems improved, and more efficient alternate patient specific QA was developed using detector arrays [52,53] or Electronic Portal Imaging Devices (EPIDs) [54][55][56][57][58] so that the requirement for regularly performed full 3D dosimetry diminished. Currently such patient specific delivery validation is considered part of a tiered RT QA environment often illustrated as a multi-layered pyramid (see figure 2) [59,60].…”