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A Digital Imaging and Communications in Medicine-based Collision Prediction System with an Angle Optimization

Hideharu Miura^1,2, Toshiya Okazue¹

¹Hiroshima High-Precision Radiotherapy Cancer Center, Hiroshima, Japan.

Journal of Medical Physics

|July 9, 2026

Summary

This study introduces a DICOM-based system to predict collisions in electron beam therapy, ensuring patient safety by automatically finding collision-free beam angles for near-surface treatments.

Keywords:

Clearance mapping Digital Imaging and Communications in Medicine collision prediction electron beam therapy

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Area of Science:

Medical Physics
Radiation Oncology
Image-Guided Therapy

Background:

Electron beam therapy requires precise applicator positioning.
Mechanical interference between applicators and patients can occur.
Pretreatment assessment of collision risk is crucial for safety.

Purpose of the Study:

To develop and validate a DICOM-based system for predicting collisions in electron beam therapy.
To enable quantitative pretreatment assessment of mechanical interference.
To automatically propose safe, alternative beam angle combinations.

Main Methods:

Geometrically modeled a 20 cm x 20 cm electron applicator as a 190-mm cube.
Extracted patient contours and isocenter data from RT Structure Set.
Calculated minimum clearance distances for various gantry, table, and collimator angles.
Implemented an optimization algorithm to identify collision-free angle configurations.

Main Results:

The system successfully identified geometric intersections in initial plans for superior, inferior, and medial regions.
Suggested alternative beam angles eliminated intersections in 3D visualization.
Collision-free alternative angles were confirmed on the linear accelerator.

Conclusions:

The developed system requires no additional hardware and integrates into existing workflows.
It offers a practical tool for assessing collision risk in electron therapy.
The system aids in optimizing beam angles for near-surface electron treatments.