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3D phase encoding 1H spectroscopic imaging of human brain
J H Duijn1, G B Matson, A A Maudsley
1Magnetic Resonance Unit, Department of Veterans Affairs Medical Center, San Francisco, CA 94121.
Magnetic Resonance Imaging
|January 1, 1992
Summary
This study introduces a 3D proton spectroscopic imaging method for whole-body MRI/MRS. It successfully images brain metabolites like choline, creatine, and N-acetyl aspartate (NAA) with high spatial resolution.
Area of Science:
- Magnetic Resonance Imaging
- Magnetic Resonance Spectroscopy
- Neuroimaging
Background:
- Proton spectroscopic imaging (PSI) is crucial for non-invasive brain metabolite analysis.
- Previous PSI methods faced challenges with spatial resolution and signal contamination, particularly near the skull.
Purpose of the Study:
- To present a novel three-dimensional (3D) phase-encoding proton spectroscopic imaging method.
- To achieve high-resolution metabolite imaging in the brain using a whole-body MRI/MRS system.
Main Methods:
- Utilized a 3D phase-encoding proton spectroscopic imaging technique on a 2 T whole-body MRI/MRS system.
- Employed Point RESolved Spectroscopy (PRESS) volume preselection and outer volume suppression pulses.
- Achieved a spatial resolution of 1.5 cubic centimeters (cc) for metabolite imaging.
Main Results:
- Successfully obtained metabolite images of choline, creatine, and N-acetyl aspartate (NAA) in normal brain tissue.
- Demonstrated effective suppression of lipid and water signals, enabling study of brain regions near the skull.
- Achieved high spatial resolution (1.5 cc) for detailed metabolite mapping.
Conclusions:
- The developed 3D phase-encoding PSI method is effective for high-resolution brain metabolite imaging.
- This technique minimizes signal contamination, allowing for improved analysis of brain regions adjacent to the skull.
- Offers a valuable tool for in vivo neurochemical research and potential clinical applications.