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Partial volume effects in volume-localized phased-array proton spectroscopy of the temporal lobe
W L Strauss1, J S Tsuruda, T L Richards
1Center for Bioengineering, University of Washington, Seattle 98195, USA.
Journal of Magnetic Resonance Imaging : JMRI
|July 1, 1995
Summary
Partial volume effects in temporal lobe epilepsy imaging influence metabolite ratios. Larger voxel sizes in magnetic resonance spectroscopy (MRS) studies increase N-acetyl aspartate (NAA) to creatine ratios in healthy subjects.
Area of Science:
- Neuroimaging
- Biomedical Engineering
- Neuroscience
Background:
- Magnetic Resonance Spectroscopy (MRS) is crucial for localizing seizure foci in temporal lobe epilepsy.
- Key metabolites analyzed include N-acetyl aspartate (NAA), creatine, choline, and lactate.
- Tissue heterogeneity can introduce partial volume effects, impacting metabolite ratio accuracy.
Purpose of the Study:
- To investigate the impact of partial volume effects on metabolite ratios in temporal lobe spectroscopy.
- To determine how varying voxel sizes affect the N-acetyl aspartate (NAA) to creatine ratio in the hippocampus.
Main Methods:
- Localized spectroscopy was performed at 1.5 T using the PRESS pulse sequence.
- A specialized phased-array coil system for the temporal lobe was utilized.
- Three different voxel sizes were employed, centered on the anterior hippocampus.
Main Results:
- Significantly different NAA to creatine ratios were observed across the different voxel sizes.
- A clear trend of increasing NAA to creatine ratios with increasing voxel size was evident.
- This indicates that partial volume effects influence NAA to creatine measurements.
Conclusions:
- Partial volume effects significantly affect metabolite ratios in temporal lobe MRS.
- Voxel size selection is critical for accurate quantification of NAA to creatine ratios.
- These findings are important for interpreting MRS data in epilepsy and other neurological conditions.