Phosphorus-31: A table-top method for 3D B₁-field amplitude and phase measurements

Area of Science:

• Magnetic Resonance Imaging (MRI)
• Biophysics
• Medical Physics

Background:

• Accurate B1 field mapping is crucial for quantitative MRI and MRS.
• Existing methods often rely on MR scanners and may not capture the full B1 field vector components or phase information.

Purpose of the Study:

• To present a novel, scanner-independent method for high-spatial-resolution, 3D B1 field distribution measurements.
• To enable automated acquisition of complete magnetic field vector component maps for various MR coils.
• To validate the method's accuracy against scanner-based measurements.

Main Methods:

• Development of a novel measurement technique for 3D B1 field mapping.
• Automated data acquisition protocols for complete magnetic field vector component mapping.
• Comparison of results with B1 field magnitude maps obtained using a conventional MR scanner.

Main Results:

• Successful implementation of a novel method for high-spatial-resolution, 3D B1 field mapping.
• Acquisition of complete receive and transmit B1 field maps, including phase information.
• Validation of the proposed method's accuracy through comparison with MR scanner-based measurements.

Conclusions:

• The presented method offers a versatile and accurate approach for B1 field mapping, independent of the MR scanner.
• The acquired B1 field maps are valuable for absolute metabolite quantification in MRS and intensity compensation in imaging.
• This technique holds potential for advancing coil development, testing, and various biological and medical MR applications.