Gradient moment compensated magnetic resonance spectroscopic imaging

Area of Science:

• Medical Imaging
• Spectroscopic Imaging
• Biomedical Engineering

Background:

• Spectroscopic imaging outside the brain is often hindered by motion artifacts due to long scan times.
• Existing techniques are susceptible to motion, limiting their clinical utility.

Purpose of the Study:

• To develop a fast spectroscopic imaging sequence with reduced sensitivity to motion.
• To evaluate the performance of the new sequence against conventional methods.

Main Methods:

• A novel fast spectroscopic imaging sequence utilizing oscillating readout gradients and a spiral out-in k-space acquisition.
• Comparison of the new sequence with phase-encoded and conventional spiral spectroscopic imaging.
• In vivo data acquisition from the liver for fat/water spectroscopic imaging.

Main Results:

• The spiral out-in readout acquisition minimizes gradient moments, reducing motion-induced artifacts.
• In vivo liver imaging demonstrated potential as a multivoxel fat/water spectroscopic imaging tool.
• Reduced ghosting and approximately 10% increase in metabolite signal were observed in the presence of motion.

Conclusions:

• The developed fast spectroscopic imaging sequence effectively mitigates motion artifacts.
• This technique offers improved image quality and signal-to-noise ratio for spectroscopic imaging.
• The sequence shows significant potential for clinical applications, particularly in abdominal imaging.