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arXiv · 2609.10825

Scale-Aware 3D Deep Learning for Robust Brain Metastasis Detection in Multimodal MRI

Sylvain Jaume·Hongming Wang·Simon K. Warfield
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Abstract

Detecting brain metastases in magnetic resonance imaging (MRI) remains challenging because lesions vary widely in size and appearance, with very small metastases occupying only a minute fraction of a three-dimensional input. We investigate whether combining different spatial fields of view (FOVs) improves lesion detection in multimodal MRI and present a scale-aware 3D deep-learning framework. The method uses independently trained $96^3$ and $64^3$ 3D U-Nets whose whole-volume probability maps are combined by weighted late fusion. This design allows us to study the effect of spatial context separately from image resolution and modality choice. On a 97-patient development cohort, cross-FOV fusion improved lesion-level precision and F1 while substantially reducing false positives relative to the individual models. A same-FOV ensemble control showed that these gains were not explained solely by averaging independently trained networks, supporting a contribution from complementary spatial context. An exploratory cross-FOV agreement filter reduced false positives but did not improve overall F1. These results support cross-FOV probability fusion as a simple and computationally practical strategy for improving the precision-false-positive trade-off in 3D brain-metastasis detection.

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Sylvain Jaume, Hongming Wang, Simon K. Warfield. 2026-09-09. Scale-Aware 3D Deep Learning for Robust Brain Metastasis Detection in Multimodal MRI. https://arxiv.org/abs/2609.10825

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