High-resolution 3D MRI of mouse brain reveals small cerebral structures in vivo

Area of Science:

• Neuroimaging
• Biomedical Engineering
• Mouse Models

Background:

• High-quality in vivo magnetic resonance imaging (MRI) of small animal brains is crucial for neuroscience research.
• Achieving excellent soft-tissue contrast and anatomical detail in mouse brains presents technical challenges.

Purpose of the Study:

• To demonstrate technical approaches for high-quality in vivo MRI of small mouse brain structures.
• To optimize MRI parameters for detailed anatomical visualization and explore preliminary applications.

Main Methods:

• Utilized 3D MRI at high isotropic resolution (100-150 micrometer voxels) to minimize partial volume effects.
• Employed long T(2)* relaxation times at 2.35 T with a small receiver bandwidth for increased signal-to-noise and reduced susceptibility artifacts.
• Performed both T(1)-weighted (FLASH) and T(2)-weighted (Fast Spin-Echo) 3D MRI acquisitions within 1-1.5 hour measurement times.

Main Results:

• Achieved excellent soft-tissue contrast and detailed anatomical insights comparable to histological mouse brain atlases.
• Demonstrated the avoidance of visual susceptibility artifacts through optimized voxel size and moderate echo times.
• Successfully applied the technique for identifying neuroanatomical variations across different mouse strains.

Conclusions:

• High-resolution 3D MRI is a powerful tool for in vivo mouse brain imaging, providing detailed anatomical information.
• The developed methods facilitate the study of neuroanatomical variations and enable applications like Mn(2+)-enhanced neuroaxonal tracing.