IMPACT: A Generic Semantic Loss for Multimodal Medical Image Registration

• URL: http://arxiv.org/abs/2503.24121v2
• Date: Thu, 03 Apr 2025 16:03:23 GMT
• Title: IMPACT: A Generic Semantic Loss for Multimodal Medical Image Registration
• Authors: Valentin Boussot, Cédric Hémon, Jean-Claude Nunes, Jason Downling, Simon Rouzé, Caroline Lafond, Anaïs Barateau, Jean-Louis Dillenseger,
• Abstract summary: IMPACT (Image Metric with Pretrained model-Agnostic Comparison for Transmodality registration) is a novel similarity metric designed for robust multimodal image registration.<n>It defines a semantic similarity measure based on the comparison of deep features extracted from large-scale pretrained segmentation models.<n>It was evaluated on five challenging 3D registration tasks involving thoracic CT/CBCT and pelvic MR/CT datasets.
• Score: 0.46904601975060667
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Image registration is fundamental in medical imaging, enabling precise alignment of anatomical structures for diagnosis, treatment planning, image-guided interventions, and longitudinal monitoring. This work introduces IMPACT (Image Metric with Pretrained model-Agnostic Comparison for Transmodality registration), a novel similarity metric designed for robust multimodal image registration. Rather than relying on raw intensities, handcrafted descriptors, or task-specific training, IMPACT defines a semantic similarity measure based on the comparison of deep features extracted from large-scale pretrained segmentation models. By leveraging representations from models such as TotalSegmentator, Segment Anything (SAM), and other foundation networks, IMPACT provides a task-agnostic, training-free solution that generalizes across imaging modalities. These features, originally trained for segmentation, offer strong spatial correspondence and semantic alignment capabilities, making them naturally suited for registration. The method integrates seamlessly into both algorithmic (Elastix) and learning-based (VoxelMorph) frameworks, leveraging the strengths of each. IMPACT was evaluated on five challenging 3D registration tasks involving thoracic CT/CBCT and pelvic MR/CT datasets. Quantitative metrics, including Target Registration Error and Dice Similarity Coefficient, demonstrated consistent improvements in anatomical alignment over baseline methods. Qualitative analyses further highlighted the robustness of the proposed metric in the presence of noise, artifacts, and modality variations. With its versatility, efficiency, and strong performance across diverse tasks, IMPACT offers a powerful solution for advancing multimodal image registration in both clinical and research settings.

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