Assessing the Feasibility of Dynamic ³¹P Spectroscopy for Metabolic Studies With a 1.0T Extremity Scanner.

Area of Science:

• Biophysics
• Medical Imaging
• Biochemistry

Background:

• ³¹P Magnetic Resonance Spectroscopy (MRS) is a valuable diagnostic tool.
• Current accessibility is limited by cost and equipment requirements.
• Low-cost extremity scanners offer potential for wider application.

Purpose of the Study:

• To assess the feasibility of in vivo non-localized ³¹P MRS using a 1.0T extremity scanner.
• To enhance accessibility of ³¹P MRS for low-cost applications.
• To enable multi-channel, non-¹H frequency capabilities on a commercial scanner.

Main Methods:

• Developed a custom transmit-only quadrature birdcage and a four-element receive coil array.
• Interfaced coils and spectrometer to a commercial 1.0T magnet.
• Created a magnetic resonance-compatible exercise device for in vivo studies.
• Assessed coils with phantom studies and in vivo human skeletal muscle experiments.

Main Results:

• The array coil improved signal-to-noise ratio by 1.31 and reduced linewidth by 13.9% compared to a loop coil.
• In vivo studies achieved sufficient temporal resolution (8 seconds) for metabolic monitoring.
• Phosphocreatine recovery and baseline pH values aligned with literature.

Conclusions:

• In vivo human skeletal muscle ³¹P MRS was successfully performed.
• Metabolic changes during an 18-minute exercise protocol were monitored.
• The enhanced system enables observation of characteristic ³¹P metabolic information.