Development of a compact mouse MRI using a yokeless permanent magnet

Area of Science:

• Medical Imaging
• Biomedical Engineering
• Magnetic Resonance Imaging

Background:

• High-field superconducting animal MRI systems are essential for research but have limitations.
• These limitations include restricted accessibility, complex maintenance, and differences in image contrast compared to clinical MRI.
• There is a need for more accessible and user-friendly MRI solutions in biomedical laboratories.

Purpose of the Study:

• To develop and evaluate a compact, portable Magnetic Resonance Imaging (MRI) system specifically designed for mouse imaging.
• To assess the system's performance in terms of imaging speed, resolution, and image quality for both whole-brain and body scans.
• To highlight the advantages of this new system over conventional high-field superconducting animal MRI.

Main Methods:

• Development of a compact MRI system utilizing a 1.0T yokeless permanent magnet and a portable MRI console.
• Installation of the entire system within a 2 m x 1 m space.
• Acquisition of T1- and T2-weighted 3D images for whole-brain imaging (2-mm slice thickness, 200-microm in-plane resolution) and T1-weighted spin-echo and FLASH 3D images for body imaging (0.5- to 1.0-mm slice thickness, 250- to 300-microm in-plane resolution).

Main Results:

• Whole-brain imaging was completed in under 90 minutes.
• Body imaging was completed in under 30 minutes.
• The system demonstrated advantages in specimen accessibility, clinical MRI-like image contrast, biological isolation, and ease of maintenance.

Conclusions:

• The developed compact mouse MRI system is suitable for routine imaging in biomedical laboratories.
• Its portability, accessibility, and performance make it a valuable alternative to traditional high-field superconducting systems.
• The system facilitates efficient and comparable imaging of mouse brains and bodies, supporting diverse research applications.