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Correction of motional artifacts in diffusion-weighted MR images using navigator echoes
R J Ordidge1, J A Helpern, Z X Qing
1NIH Center for Stroke Research, Department of Neurology, Henry Ford Health Sciences Center, Detroit, MI 48202.
Magnetic Resonance Imaging
|January 1, 1994
Summary
Patient motion degrades MRI quality. A new pulse sequence uses spin echo phase information to correct motion artifacts, improving diffusion quantification in brain tissue imaging.
Area of Science:
- Medical Imaging
- Neuroimaging
- Biophysics
Background:
- Patient motion is a significant challenge in diffusion-weighted magnetic resonance imaging (DW-MRI).
- Motion introduces phase shifts in the MR signal, leading to image artifacts and inaccurate diffusion measurements.
- Standard 2D Fourier Transform (2DFT) imaging is particularly susceptible to these motion-induced errors.
Purpose of the Study:
- To develop and validate a novel MR pulse sequence for correcting patient motion in DW-MRI.
- To improve the accuracy of diffusion quantification in brain tissue by mitigating motion artifacts.
Main Methods:
- A modified diffusion-weighted MR pulse sequence was designed.
- The sequence incorporates an additional spin echo to acquire phase information.
- This phase information is utilized to correct for motion-related signal distortions.
Main Results:
- The proposed technique significantly reduces motion artifacts in DW-MRI.
- Demonstrated improvement in the quantification of diffusion values in human brain studies.
- Enhanced image quality and reliability of diffusion measurements were observed.
Conclusions:
- The developed spin echo-based motion correction technique effectively addresses motion artifacts in DW-MRI.
- This method offers a valuable tool for improving the diagnostic accuracy of diffusion imaging in neuroimaging applications.