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MR Molecular Imaging of Prostate Cancer with a Small Molecular CLT1 Peptide Targeted Contrast Agent
Published on: September 3, 2013
Short echo time in vivo prostate ¹H-MRSI
Niranjan Venugopal1, Boyd McCurdy, Salem Al Mehairi
1Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba, Canada. niranjan.venugopal@nrc-cnrc.gc.ca
Magnetic Resonance Imaging
|December 14, 2011
Summary
This study introduces a new prostate magnetic resonance spectroscopic imaging (MRSI) method using conformal voxel MRS (CV-MRS) to reduce lipid contamination. The technique enables high-quality, short echo time (TE) prostate spectra for better metabolite detection.
Area of Science:
- Magnetic Resonance Imaging
- Biomedical Engineering
- Medical Physics
Background:
- Prostate magnetic resonance spectroscopic imaging (MRSI) faces challenges in visualizing short echo time (TE) metabolites due to lipid contamination and pulse timing limitations.
- Detecting specific metabolites like myo-inositol, scyllo-inositol, taurine, and glutamine/glutamate at short TEs is crucial for prostate cancer assessment.
Purpose of the Study:
- To develop and validate a modified pulse sequence for short TE (40 ms) prostate MRSI with reduced lipid contamination.
- To assess the feasibility of acquiring high-quality in vivo prostate spectra at short TEs for improved metabolite detection.
Main Methods:
- Implementation of a modified pulse sequence incorporating conformal voxel MRS (CV-MRS) to optimize excitation volume and reduce lipid artifacts.
- Utilized a modified LCModel for spectral analysis of in vivo prostate data from single and multi-voxel acquisitions.
- Compared short TE (40 ms) and long TE (130 ms) acquisitions in 3D MRSI experiments.
Main Results:
- Achieved a 57% improvement in signal-to-noise ratio (SNR) in single voxel experiments by reducing TE.
- Demonstrated a 35% increase in adequately fitted metabolite peaks in 3D MRSI compared to long TE acquisitions.
- Reported a 42 ± 24% relative improvement in detectable, well-fitted citrate voxels using LCModel.
Conclusions:
- The modified short TE (40 ms) prostate MRSI technique effectively reduces lipid contamination and enhances spectral quality.
- This approach enables the detection of short T2 metabolites and maintains citrate signal integrity, improving diagnostic potential.
- The CV-MRS technique offers a viable method for high-quality prostate MRSI at short echo times.
