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An Experimental Protocol for Assessing the Performance of New Ultrasound Probes Based on CMUT Technology in Application to Brain Imaging

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A 3-D Cross-Modal Keypoint Descriptor for MR-US Matching and Registration.

Daniil Morozov, Reuben Dorent, Nazim Haouchine

IEEE Transactions on Medical Imaging

|April 3, 2026

Summary

This study introduces a new 3D cross-modal keypoint descriptor for aligning real-time ultrasound (iUS) with MRI. The method improves intraoperative registration accuracy despite differences in imaging modalities.

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Area of Science:

Medical Imaging
Computer Vision
Surgical Navigation

Background:

Intraoperative registration of real-time ultrasound (iUS) to preoperative Magnetic Resonance Imaging (MRI) is challenging due to significant differences in appearance, resolution, and field-of-view.
Existing methods struggle to bridge these modality-specific gaps, hindering accurate surgical guidance.

Purpose of the Study:

To develop a novel 3D cross-modal keypoint descriptor for robust MRI-iUS matching and registration.
To enable accurate intraoperative alignment of real-time ultrasound with preoperative MRI data.

Main Methods:

A patient-specific matching-by-synthesis approach generates synthetic iUS from MRI for supervised contrastive training.
A probabilistic keypoint detection strategy identifies salient, modality-consistent locations.
Curriculum-based triplet loss with hard negative mining trains rotation-invariant descriptors robust to iUS artifacts.

Main Results:

The proposed descriptor achieved 69.8% average precision in matching across 11 patients, outperforming state-of-the-art methods.
The registration approach yielded a competitive mean Target Registration Error of 2.39 mm on the ReMIND2Reg benchmark.
The framework demonstrated robustness to iUS field-of-view variations and required no manual initialization.

Conclusions:

The novel 3D cross-modal keypoint descriptor effectively addresses the challenges of MRI-iUS registration.
This approach offers an interpretable, accurate, and robust solution for intraoperative image guidance, enhancing surgical navigation.