Computed tomographic evaluation of myocardial ischemia

Area of Science:

• Cardiology
• Radiology
• Medical Imaging

Background:

• Myocardial ischemia in coronary artery disease (CAD) arises from oxygen supply-demand imbalance.
• Accurate ischemia assessment improves prognosis in CAD patients.
• Current non-invasive tests have limitations in evaluating the hemodynamic significance of coronary stenosis.

Purpose of the Study:

• To review emerging functional computed tomography (CT) techniques for evaluating myocardial ischemia.
• To discuss CT perfusion and CT-fractional flow reserve (CT-FFR) in assessing coronary artery stenosis.
• To analyze the principles, technology, advantages, limitations, and evidence for these functional CT methods.

Main Methods:

• Review of current literature on CT perfusion and CT-FFR.
• Explanation of CT perfusion principles involving contrast-enhanced myocardial imaging during pharmacological stress.
• Description of CT-FFR methodology utilizing computational fluid dynamics for hemodynamic assessment.

Main Results:

• CT angiography is a primary tool for CAD evaluation but lacks hemodynamic information.
• CT perfusion provides functional data by assessing blood flow during stress.
• CT-FFR quantifies the hemodynamic impact of stenosis using advanced modeling.

Conclusions:

• Functional CT techniques, CT perfusion and CT-FFR, address limitations of standard CT angiography in evaluating myocardial ischemia.
• These advanced CT methods offer improved assessment of coronary artery stenosis significance.
• Further evidence supports the role of functional CT in guiding CAD management.