A novel respiratory tracking system for smart-gated PET acquisition

Area of Science:

• Medical Imaging
• Nuclear Medicine
• Biomedical Engineering

Background:

• Respiratory motion significantly degrades PET/CT image quality, impacting diagnostic accuracy.
• Accurate motion correction is essential for reliable PET quantitation and lesion detection.

Purpose of the Study:

• To validate the multidimensional respiratory tracking (MDRT) system for respiratory motion correction in PET/CT.
• To investigate the novel smart gating (SG) PET acquisition technique for prospective motion-free data acquisition.

Main Methods:

• MDRT uses visual tracking of fiducial markers with a video camera to monitor breathing motion.
• A threshold window and trigger system (250 Hz) enable SG to acquire PET data only during specific breathing phases.
• MDRT accuracy was assessed using an oscillating phantom and compared to the real-time position management (RPM) system in patients.

Main Results:

• MDRT demonstrated high accuracy (<2% error) in phantom studies and within 10% error compared to RPM in patients.
• The SG technique successfully corrected motion artifacts and improved PET quantitation in phantoms.
• In SBRS patients, SG improved lesion detection and PET/CT spatial matching, with one case showing a significant SUV increase.

Conclusions:

• The MDRT system is accurate for tracking respiratory motion.
• The smart gating (SG) technique, aided by MDRT, enables prospective acquisition of motion-free PET images.
• These advancements enhance PET/CT imaging for improved clinical applications.