Related Experiment Video
Updated: Jul 7, 2026
07:13
Multimodal Cross-Device and Marker-Free Co-Registration of Preclinical Imaging Modalities
Published on: October 27, 2023
Concurrent correction of geometric distortion and motion using the map-slice-to-volume method in echo-planar imaging
Desmond T B Yeo1, Jeffrey A Fessler, Boklye Kim
1Department of Radiology, University of Michigan Medical School, Ann Arbor, MI 48109, USA.
Magnetic Resonance Imaging
|February 19, 2008
Summary
Head motion in fMRI echo-planar imaging (EPI) degrades accuracy. This study introduces a new method to improve motion correction by accounting for motion-induced field map changes, enhancing image registration and activation detection.
Area of Science:
- Neuroimaging
- Magnetic Resonance Imaging
Background:
- Head motion significantly degrades functional MRI (fMRI) echo-planar imaging (EPI) data accuracy.
- EPI is susceptible to geometric distortions, which are exacerbated by motion-induced field map changes.
Purpose of the Study:
- To evaluate an improved motion correction method for fMRI EPI data.
- To address the limitations of conventional static field map correction by accounting for motion-induced field map variations.
Main Methods:
- Developed a slice-to-volume mapping technique with concurrent iterative field-corrected reconstruction.
- Utilized updated field maps derived from spatially transformed and resampled static field maps.
- Accounted for translational and in-plane rotational motion-induced field map changes.
Main Results:
- Demonstrated improved accuracy in image registration for simulated EPI data.
- Showcased enhanced field-corrected image reconstruction.
- Reported improved activation detection accuracy.
Conclusions:
- The proposed method effectively improves motion correction in fMRI EPI by incorporating dynamic field map updates.
- This approach enhances the reliability of fMRI analyses in the presence of head motion.
