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Reduce, Then Encode: Multiscale Volumetric Reduction for 2D Foundation Models in Brain MRI
Pretrained 2D foundation models offer a practical alternative to dedicated 3D pretraining for brain structural magnetic resonance imaging (sMRI), but their use on volumetric data requires bridging the mismatch between a 2D encoder and a 3D volume input. Existing methods typically encode slices independently and integra …