arXiv Computer Vision By Chen Cheng, Michael Ferraro, James Grover, David E J Waddington, Emily Hewson

BEAM3R: Beam's-eye-view architecture with Mamba-3 for implicit dose reconstruction

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BEAM3R is a dose estimation framework that operates in beam’s-eye-view (BEV) for both photon and proton beamlet calculations. It uses a Mamba‑3 state‑space depth‑sequence core combined with physics‑based transport conditioning, sharing a 2D CNN encoder‑decoder architecture to process per‑plane BEV slices. The system achieves high accuracy on the DoseRAD2026 challenge, with local gamma pass rates above 96% for CT‑based models and runtimes under 25 s for photon and 18 s for proton predictions.

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