Diffusion microscopic MRI of the mouse embryo: Protocol and practical implementation in the splotch mouse model.

Area of Science:

• Developmental biology
• Biomedical imaging
• Genetics

Background:

• Advanced imaging techniques are crucial for characterizing mutant mouse embryos.
• Diffusion microscopic MRI (microMRI) offers potential for embryo phenotyping but faces limitations due to long scan times.
• Lack of standardized protocols hinders routine microMRI adoption for embryo analysis.

Purpose of the Study:

• To develop and validate optimized experimental protocols for diffusion microMRI of mouse embryos.
• To address the limitations of extended scanning times in current microMRI procedures.
• To facilitate routine phenotyping of mutant mouse embryos through improved data acquisition.

Main Methods:

• Development of two protocols for diffusion microMRI experimental design in mouse embryos.
• Consideration of embryo preparation and pulse sequence parameters for optimal data.
• Application of protocols to the splotch mouse model for validation.

Main Results:

• Protocols yield Diffusion Tensor Imaging (DTI) data at 75 microm isotropic resolution in 24 min/direction.
• Preliminary imaging achievable in 3 hours, with detailed imaging in 9 hours.
• Successful assessment of spinal cord pathology in the splotch mouse model.

Conclusions:

• Guidelines for designing diffusion microMRI experiments are presented.
• Protocols are adaptable for various research settings and studies.
• The developed methods are suitable for routine use and encourage adoption by the phenotyping community.