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

Ivan Kutuzov,Timothy Van Beek,Boyd M.C Mccurdy

doi:10.1002/acm2.13280

Ivan Kutuzov, Timothy Van Beek + Show 1 more

Open Access

https://doi.org/10.1002/acm2.13280

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Abstract

PurposeThere 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.MethodsThe 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.ResultsThe 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 non‐coplanar 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%.ConclusionsA 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.

Highlights

Introduction and Rationale1.1 Requirements for the Accuracy of Dose Delivery in Modern Radiation Therapy.Radiation therapy is a cancer treatment modality that heavily relies upon technology, and it is largely dependent on error-free functioning of complicated radiation delivery equipment and its proper use
The results showed the maximum heart, esophagus, trachea, bronchus and spinal cord doses were reduced by 32%, 72%, 37%, 44%, and 53% respectively[31]
Due to the increased complexity, it leads to the necessity of more stringent quality assurance

Summary

Introduction

1.1 Requirements for the Accuracy of Dose Delivery in Modern Radiation Therapy. Radiation therapy is a cancer treatment modality that heavily relies upon technology, and it is largely dependent on error-free functioning of complicated radiation delivery equipment and its proper use. This is because modern radiation treatment employs complex and powerful machines capable of delivering high doses of radiation in a short time, usually within minutes. If delivered incorrectly these radiation doses can permanently harm or even kill a patient. A treatment facility needs appropriately designed quality assurance and safety programs to help ensure this accuracy

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