Coil Combination of Multichannel Single Voxel Magnetic Resonance Spectroscopy with Repeatedly Sampled In Vivo Data

Area of Science:

• Medical Imaging
• Spectroscopy
• Biophysics

Background:

• Magnetic Resonance Spectroscopy (MRS) is a noninvasive technique for molecular analysis and metabolite detection.
• Low signal-to-noise ratio (SNR) in MRS hinders its clinical application and further development.
• Existing methods like multichannel coils and repeated sampling offer partial improvements to SNR.

Purpose of the Study:

• To develop a novel coil-combination method to enhance SNR in MRS.
• To leverage the complementary benefits of multichannel coil acquisition and repeated sampling.
• To improve the diagnostic accuracy and utility of MRS in clinical settings.

Main Methods:

• Proposed a novel coil-combination method: average smoothing singular value decomposition.
• Integrated repeatedly sampled signals into the multichannel coil combination process.
• Pretreated sensitivity matrices with whitened singular value decomposition (WSVD) and applied smoothing along repeated sampling dimensions.

Main Results:

• The proposed method demonstrated superior performance compared to Brown, WSVD, and generalized least squares methods.
• Evaluated performance using one phantom and 20 in vivo spectra.
• Achieved significant improvement in signal-to-noise ratio (SNR).

Conclusions:

• The average smoothing singular value decomposition method effectively enhances SNR in MRS.
• This novel approach offers a promising strategy for advancing clinical MRS applications.
• Improved SNR facilitates more accurate molecular structure determination and metabolite detection.