Real-time 3D motion tracking for small animal brain PET

Area of Science:

• Medical Imaging
• Biomedical Engineering
• Animal Research

Background:

• High-resolution positron emission tomography (PET) imaging in conscious, unrestrained animals faces motion artifact challenges.
• Motion correction is crucial for accurate image reconstruction in small animal PET studies.
• Existing methods may not adequately address the dynamic nature of animal movement during scans.

Purpose of the Study:

• To develop and evaluate a motion tracking system for use with small animal PET.
• To integrate a stereo-optical tracker with a microPET scanner for real-time motion data acquisition.
• To assess the system's performance and its ability to correct for motion artifacts.

Main Methods:

• Integration of a commercial stereo-optical MicronTracker S60 with a Siemens Focus-220 microPET scanner.
• Development of calibration and synchronization protocols for the combined system.
• Performance evaluation using a phantom study to demonstrate motion tracking and correction capabilities.

Main Results:

• The integrated system achieved sub-millimeter calibration accuracy.
• Lightweight markers provided accurate 3D motion data.
• A significant reduction in motion artifacts was observed in the phantom study.
• The system demonstrated potential for rigid-body motion correction in small animal PET.

Conclusions:

• The developed motion tracking system is a viable tool for improving image quality in small animal PET.
• This approach represents a practical step towards effective motion correction in preclinical imaging.
• Further improvements in synchronization and pose measurement accuracy are possible.