Investigation of the PSF-choice method for reduced lipid contamination in prostate MR spectroscopic imaging

The purpose of this work was to evaluate a previously proposed approach that aims to improve the point spread function (PSF) of MR spectroscopic imaging (MRSI) to avoid corruption by lipid signal arising from neighboring voxels. Retrospective spatial filtering can be used to alter the PSF; however,...

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Bibliographic Details
Published in:Magnetic resonance in medicine 2012-11, Vol.68 (5), p.1376-1382
Main Authors: Panych, Lawrence P., Roebuck, Joseph R., Chen, Nan-kuei, Tang, Yi, Madore, Bruno, Tempany, Clare M., Mulkern, Robert V.
Format: Article
Language:English
Subjects:
Adipose Tissue - chemistry
Algorithms
Humans
Image Enhancement - methods
Image Interpretation, Computer-Assisted - methods
Lipids - analysis
Magnetic Resonance Imaging - methods
Magnetic Resonance Spectroscopy - methods
Male
MR spectroscopic imaging
point spread function
prostate imaging
Prostatic Neoplasms - chemistry
Reproducibility of Results
Sensitivity and Specificity
truncation artifact
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Summary:The purpose of this work was to evaluate a previously proposed approach that aims to improve the point spread function (PSF) of MR spectroscopic imaging (MRSI) to avoid corruption by lipid signal arising from neighboring voxels. Retrospective spatial filtering can be used to alter the PSF; however, this either reduces spatial resolution or requires extending the acquisition in k‐space at the cost of increased imaging time. Alternatively, the method evaluated here, PSF‐choice, can modify the PSF localization to reduce the contamination from adjacent lipids by conforming the signal response more closely to the desired MRSI voxel grid. This is done without increasing scan time or degrading SNR of important metabolites. PSF‐choice achieves improvements in spatial localization through modifications to the radiofrequency excitation pulses. An implementation of this method is reported for MRSI of the prostate, where it is demonstrated that, in 13 of 16 pilot prostate MRSI scans, intravoxel spectral contamination from lipid was significantly reduced when using PSF‐choice. Phantom studies were also performed that demonstrate, compared with MRSI with standard Fourier phase encoding, out‐of‐voxel signal contamination of spectra was significantly reduced in MRSI with PSF‐choice. Magn Reson Med, 2012. © 2012 Wiley Periodicals, Inc.
ISSN:0740-3194
1522-2594
DOI:10.1002/mrm.24132