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PET Perfusion and Flow Assessment: Tomorrows' Technology Today
1Cardiovascular Imaging Program, Departments of Medicine and Radiology; Division of Nuclear Medicine and Molecular Imaging, Department of Radiology; and Cardiovascular Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA.
Quantitative PET/CT imaging accurately diagnoses coronary artery disease (CAD). Normal myocardial blood flow (MBF) and flow reserve (MFR) exclude high-risk CAD, while reduced MFR indicates increased adverse event risk.
Area of Science:
- Cardiovascular imaging
- Nuclear cardiology
- Cardiac CT
Background:
- Coronary artery disease (CAD) diagnosis and risk stratification are crucial.
- Quantitative myocardial perfusion PET/CT offers comprehensive cardiac assessment.
- Accurate evaluation aids in patient management and preventive strategies.
Purpose of the Study:
- To highlight the diagnostic and prognostic value of quantitative myocardial perfusion PET/CT.
- To emphasize the role of myocardial blood flow and flow reserve (MFR) in risk assessment.
- To discuss the utility of assessing atherosclerotic burden and its implications.
Main Methods:
- Utilizing quantitative myocardial perfusion PET/CT imaging.
- Assessing regional myocardial perfusion, LV volumes, ejection fraction.
- Quantifying myocardial blood flow and flow reserve (MFR).
- Evaluating calcified atherosclerotic burden via CT calcium scoring or transmission scans.
Main Results:
- Normal stress MFR (>2.0) has high negative predictive value for obstructive CAD.
- Global normal MFR (>2.0) identifies patients at lower clinical risk.
- Severely reduced MFR (<1.5) indicates high risk for adverse events from obstructive CAD or microvascular dysfunction.
- CT-derived atherosclerotic burden guides preventive therapy decisions.
Conclusions:
- Quantitative myocardial perfusion PET/CT is a highly accurate tool for CAD assessment.
- MFR is a key metric for risk stratification in ischemic heart disease.
- Combined assessment of MFR and atherosclerotic burden optimizes patient management.
- Further trials are needed to confirm revascularization benefits in specific CAD subgroups.
