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Magnetic Resonance Imaging

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...

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Related Experiment Video

Updated: Jul 8, 2025

Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging

Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging

Published on: November 8, 2012

Framewise multi-echo distortion correction for superior functional MRI.

Andrew N Van^1,2, David F Montez^2,3, Timothy O Laumann³

¹Department of Biomedical Engineering, Washington University in St. Louis, MO 63130.

Biorxiv : the Preprint Server for Biology

|December 11, 2023

Summary

This summary is machine-generated.

Functional MRI (fMRI) data distortions from magnetic field (B0) fluctuations are corrected using a new method, MEDIC. This approach improves anatomical alignment and reduces motion artifacts in resting-state functional connectivity (RSFC) maps.

Keywords:

Distortion Correction Multi-Echo fMRI

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Area of Science:

Neuroimaging
Magnetic Resonance Imaging (MRI)

Background:

fMRI data suffer from geometric distortions caused by B0 inhomogeneities.
Current correction methods require separate field map acquisition, which is sensitive to participant motion.
Head motion during fMRI scans can alter B0 fields, complicating distortion correction.

Conclusions:

MEDIC offers accurate, framewise distortion correction for fMRI data without needing separate field maps.
This method enhances the benefits of multi-echo fMRI over single-echo techniques.
MEDIC improves data quality and reliability, especially in challenging scanning conditions with head motion.