An open-source platform for interactive collision prevention in photon and particle beam therapy treatment planning

TL;DR

This paper introduces an open-source, interactive platform that visualizes treatment machine components and patient geometry in 3D, enabling collision avoidance during treatment planning for photon and particle therapy.

Contribution

The platform uniquely integrates real-time 3D visualization and interaction within existing planning software, validated with actual patient data and full-body scans, to prevent collisions before treatment.

Findings

Validated with RayStation and actual patient plans

Successfully incorporated full-body phantom geometry

Enabled real-time collision risk assessment

Abstract

We present an open-source platform to aid medical dosimetrists in preventing collisions between gantry head and patient or couch during photon or particle beam therapy treatment planning. This generic framework uses the native scripting interface of the particular planning software to import STL files of the treatment machine elements. These are visualized in 3D together with the contoured or scanned patient surface. A graphical dialog with sliders allows the interactive rotation of the gantry and couch, with real-time feedback. To prevent a future replanning, treatment planners can assess in advance and exclude beam angles resulting in a potential risk of collision. The software platform is publicly available on GitHub and has been validated for RayStation with actual patient plans. Furthermore, the incorporation of the complete patient geometry was tested with a 3D surface scan of a full-body phantom performed with a handheld smartphone. With this study, we aim at minimizing the risk of replanning due to collisions and thus of treatment delays and unscheduled consumption of manpower. The clinical workflow can be streamlined at no cost already at the treatment planning stage. By ensuring a real-time verification of the plan feasibility, the script might boost the use of optimal couch angles that a planner might shy away from otherwise.