Calculation of sensitivity correction factors for surface coil MRS

Area of Science:

• Medical Imaging
• Magnetic Resonance Spectroscopy (MRS)
• Coil Sensitivity Mapping

Background:

• Surface coils in MRS exhibit inhomogeneous sensitivity, leading to spatially dependent signal measurements.
• Accurate quantification of MRS signals is crucial for reliable diagnostic information.
• Existing methods struggle to fully compensate for surface coil inhomogeneity.

Purpose of the Study:

• To develop and validate a method for correcting spatially dependent signal variations in MRS.
• To improve the accuracy of MRS signal quantification using surface coils.
• To establish a robust approach for accounting for coil sensitivity variations.

Main Methods:

• Acquisition of a 3D sensitivity map for the surface coil.
• Calculation of position-dependent correction factors based on the coil map.
• Application of correction factors to MRS spectra from defined volumes of interest (VOIs).

Main Results:

• The developed method effectively corrects for surface coil inhomogeneity.
• Quantification accuracy improved to within 4% over a range of two coil radii.
• Correction factors successfully accounted for signal reduction due to coil sensitivity variations.

Conclusions:

• The proposed method significantly enhances the accuracy of MRS quantification with surface coils.
• This technique provides a reliable way to address signal inhomogeneity in MRS.
• Accurate MRS data is achievable even with inhomogeneous surface coil responses.