Dual-gated cardiac PET-clinical feasibility study

Area of Science:

• Medical Imaging
• Nuclear Medicine
• Cardiovascular Imaging

Background:

• Respiratory and cardiac motion degrade image quality in myocardial PET/CT scans.
• Accurate imaging of small structures like vulnerable coronary plaques requires simultaneous cardiac and respiratory gating.

Purpose of the Study:

• To test the feasibility of a novel robust method for dual cardiac-respiratory gating in myocardial imaging.
• To evaluate the preservation of quantification in dual-gated images using a phantom study.

Main Methods:

• List-mode data were rearranged into dual-gated segments using defined cardiac and respiratory gates.
• The method was evaluated in minipig and human studies using a radioactive catheter tip and 18-F-FDG PET/CT.
• Standard algorithms of a commercial PET/CT scanner were used for reconstruction.

Main Results:

• The dual-gating method proved feasible for in vivo imaging, enhancing resolution of a radioactive catheter tip.
• Human studies showed the dual gating was feasible and easily integrated into clinical routine.
• Significant myocardial motion (>20 mm) was observed, with improved visualization of myocardial structures and papillary muscles in diastolic images.

Conclusions:

• Initial clinical experiences with robust cardiac-respiratory dual gating are promising.
• Further validation in larger patient cohorts with plaque-specific tracers is recommended.
• The method enhances visualization of cardiac structures by mitigating motion artifacts.