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All papersComputer Vision

Fast Slice-Wise Deep Learning Motion Correction for Spinal Cord Functional MRI

/ Paper arXiv 2611.14677

Key numbers

25%tSNR +10 to +25%
0.1%leaves almost no slice displaced by more than one voxel (<0.1%)

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Abstract

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Respiratory and bulk motion displace the spinal cord between the volumes of a functional MRI time series. Current methods such as the Spinal Cord Toolbox (SCT) take several minutes per time series, and general-purpose brain tools register whole volumes, whereas the cord moves mainly slice by slice. We propose a lightweight convolutional neural network that regresses the in-plane translation aligning each axial slice to a reference. Two models, trained without motion labels, correct large and then residual motion. On a 3T (120 scans) and a 7T (59 scans) dataset, the proposed method improves on SCT on every metric (tSNR +10 to +25%, DVARS -20 to -38%), leaves almost no slice displaced by more than one voxel (<0.1%), performs on par with a slice-wise AFNI variant and better than slice-wise FSL FLIRT, and runs in about 10 s per scan, about 30 times faster than SCT. The code is available at https://github.com/ivadomed/moco-dl and the method is available in SCT v7.4.

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