What question did this study set out to answer?

The aim is to develop an efficient ray-tracing algorithm for dose verification in adaptive radiation therapy.

January 20, 2026Medical Physics

Efficient raytracing‐based quasi‐analytical photon beam transport in a multi‐leaf collimator for gimbal‐mounted O‐ring radiotherapy system

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Develops a novel algorithm for photon transport in multi-leaf collimators, suggesting improved dose verification accuracy in radiation therapy.

The aim is to develop an efficient ray-tracing algorithm for dose verification in adaptive radiation therapy.
Developed a ray-tracing algorithm for intra-MLC photon transport.
Employed an intersection-based ray-tracing technique for photon path length calculations.
Integrated Russian roulette techniques to enhance computational efficiency.
Verified the algorithm using Geant4 for dose calculations in digital phantoms and patient geometries.
The algorithm reproduced fluence and dose distributions within 2% compared to full Geant4 simulations.
Achieved a computational speed-up of 56–160 times over Geant4 for MLC transport calculations.

Hirayama et al. (2026) studied this question.

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Develops a novel algorithm for photon transport in multi-leaf collimators, suggesting improved dose verification accuracy in radiation therapy.