Quantitative Coronary Physiology for Clinical Management: the Imaging Standard

Area of Science:

• Cardiovascular Imaging
• Interventional Cardiology
• Physiology

Background:

• Accurate assessment of coronary artery disease severity is crucial for guiding revascularization decisions.
• Variations in positron emission tomography (PET) and magnetic resonance imaging (MRI) protocols complicate the standardization of myocardial perfusion quantification.
• Physiologic assessment integrates risk-benefit analysis for personalized treatment strategies.

Purpose of the Study:

• To establish a simple, standard performance test for quantifying myocardial perfusion using PET.
• To ensure measurement accuracy and reflect clinical coronary pathophysiology for informed interventional decisions.
• To define a physiologic severity-risk-benefit continuum for revascularization.

Main Methods:

• Developing a standard performance test for PET-based myocardial perfusion quantification.
• Testing low perfusion accuracy by measuring rest perfusion in transmural scar (0.2 cm³/min/gm) in at least five patients.
• Assessing regional and global coronary flow reserve (CFR) and stress perfusion (2.9 cm³/min/gm) with ±15% variability in 15 healthy volunteers over sequential rest-stress PET studies.

Main Results:

• The proposed standard performance test combines measurement accuracy with clinical coronary pathophysiology.
• The test evaluates the capacity to measure critical thresholds for low perfusion and normal flow reserve.
• Validation involves assessing accuracy in detecting low perfusion and variability in healthy individuals.

Conclusions:

• Standardized PET protocols are essential for accurate myocardial perfusion quantification.
• A validated performance test can ensure reliable physiologic severity assessment.
• This approach supports evidence-based, personalized interventional decisions in coronary artery disease management.