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Isotropic diffusion weighting in radial fast spin-echo magnetic resonance imaging
Joelle E Sarlls1, Rexford D Newbould, Maria I Altbach
1Biomedical Engineering Program, University of Arizona, Tuscon, Arizona 85724-5084, USA.
Magnetic Resonance in Medicine
|May 21, 2005
Summary
This study introduces a new diffusion-weighted MRI (DWMRI) technique using radial fast spin-echo (radial-FSE) to achieve isotropic diffusion weighting in a single scan, reducing motion artifacts for high-resolution imaging.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Diffusion-Weighted Imaging (DWI)
Background:
- Multishot diffusion-weighted MRI (DWMRI) often suffers from motion and susceptibility artifacts.
- Radial fast spin-echo (radial-FSE) techniques offer improved robustness against artifacts and higher spatial resolution.
Purpose of the Study:
- To present a novel method for achieving isotropic diffusion weighting in a single radial k-space dataset.
- To enable artifact-free DWMRI with high spatial resolution using radial-FSE.
Main Methods:
- Altering diffusion weighting gradient directions between TR periods to sensitize to motion in different directions.
- Controlling radial line acquisition order (view ordering) to mitigate motion, T2 decay, and diffusion anisotropy artifacts.
- Acquiring a single radial k-space dataset for isotropic diffusion weighting.
Main Results:
- Successfully generated effectively isotropic diffusion-weighted images within a single radial-FSE scan.
- Demonstrated reduction of significant artifacts from motion, T2 decay, and diffusion anisotropy.
- Achieved high spatial resolution DWMRI data.
Conclusions:
- The novel method enables isotropic diffusion weighting in radial-FSE DWMRI.
- This approach allows for artifact-free, high-resolution DWMRI acquisition in a single scan.
- Optimized view ordering further enhances data quality by minimizing common artifacts.