Development of a 1.0 T MR microscope using a Nd-Fe-B permanent magnet

Area of Science:

• Biomedical Engineering
• Materials Science
• Physics

Background:

• Magnetic Resonance Imaging (MRI) is a powerful non-invasive imaging technique.
• Developing compact and high-performance MRI systems is crucial for broader research applications.
• Permanent magnets offer potential for smaller, more accessible MRI systems but face challenges like temperature sensitivity.

Purpose of the Study:

• To develop a compact 1.0 Tesla (T) MRI microscope utilizing a permanent magnet.
• To address the temperature sensitivity of the permanent magnet's magnetic field.
• To evaluate the performance of the developed MRI microscope for biological specimen imaging.

Main Methods:

• Construction of a compact 1.0 T MRI microscope using a high-performance Neodymium-Iron-Boron (Nd-Fe-B) permanent magnet.
• Development of an internal Nuclear Magnetic Resonance (NMR) locking technique to compensate for magnetic field drift due to temperature variations.
• Evaluation of system performance using various biological specimens, assessing image quality and acquisition times.

Main Results:

• Successful development of a compact MRI console (54 cm x 77 cm x 60 cm, 80 kg).
• Achieved good signal-to-noise ratio (SNR) 3D images with voxel dimensions ranging from 50 microm(3) to 200 microm(3).
• Acquisition of images within practical imaging times of 0.5 to 7.5 hours.

Conclusions:

• The developed permanent-magnet compact MR microscope is a viable tool for scientific research.
• The integrated NMR locking technique effectively manages magnetic field instability.
• This compact MRI system demonstrates significant potential for detailed analysis of biological specimens.