Coronary micro-computed tomography angiography in mice

Area of Science:

• Biomedical Imaging
• Preclinical Research
• Cardiovascular Science

Background:

• Coronary computed tomography angiography (CCTA) is vital for diagnosing human coronary artery disease.
• Imaging small animal coronaries presents significant challenges due to high heart rates and small vessel diameters.
• Existing preclinical imaging methods struggle to meet the spatial and temporal resolution demands for mouse coronary arteries.

Purpose of the Study:

• To demonstrate the feasibility of high-resolution coronary artery imaging in mice using micro-CT.
• To overcome the technical limitations of imaging small, fast-moving cardiac structures in rodents.
• To reduce the disparity between clinical cardiac imaging and preclinical research capabilities.

Main Methods:

• Utilized a custom-built micro-CT scanner with specialized reconstruction algorithms.
• Achieved high spatial and temporal resolution suitable for imaging minute anatomical structures.
• Administered a blood-pool contrast agent to ten mice for enhanced visualization.

Main Results:

• Successfully visualized the left coronary artery and its major branches in all imaged mice.
• Achieved sufficient resolution to identify coronary artery anatomy in mice.
• Reduced radiation dose to below 1 Gray through dedicated reconstruction algorithms.

Conclusions:

• Micro-CT enables detailed visualization of mouse coronary arteries for the first time.
• This technique significantly advances preclinical cardiac imaging capabilities.
• Further development is needed to enable longitudinal studies in mouse coronary artery imaging.