S4: Motion Correction
Volume-to-volume realignment for spinal cord fMRI.
Purpose
S4 corrects for subject motion during the functional acquisition using cord-optimized registration.
Algorithm
- Reference Volume Selection - Use robust reference from S3
- Iterative Registration - Register each volume to reference
- Motion Parameter Extraction - Extract 6 DOF parameters
- Outlier Detection - Flag high-motion volumes
- Interpolation - Apply transforms with sinc interpolation
Key Features
- Cord-centric cost function
- Regularized transforms for spinal cord geometry
- Frame-wise displacement calculation
- Integration with confound regression
Implementation in progress