The many ways to myocardial perfusion imaging

Area of Science:

• Cardiology
• Medical Imaging

Background:

• Myocardial perfusion imaging (MPI) is crucial for managing patients with suspected or known coronary artery disease (CAD).
• Nuclear cardiology, utilizing single-photon emission computed tomography (SPECT) and positron emission tomography (PET), is the primary noninvasive method for assessing myocardial perfusion.

Purpose of the Study:

• This review aims to illustrate various noninvasive imaging modalities for evaluating myocardial perfusion.
• It will highlight the advantages and disadvantages of each technique in assessing coronary artery disease.

Main Methods:

• Discussion of SPECT flow agents with rapid myocardial extraction and cardiac uptake proportional to blood flow.
• Exploration of PET tracers for quantitative myocardial blood flow and coronary flow reserve measurement.
• Overview of emerging techniques including contrast echocardiography and magnetic resonance imaging (MRI).

Main Results:

• SPECT and PET can detect perfusion abnormalities indicative of myocardial ischemia caused by coronary artery stenosis.
• Contrast echocardiography shows promise for myocardial perfusion evaluation, pending further technical definition.
• MRI offers high contrast and spatial resolution, differentiating sub-endocardial and sub-epicardial perfusion as a non-ionizing alternative.

Conclusions:

• Noninvasive imaging modalities like SPECT, PET, contrast echocardiography, and MRI play vital roles in assessing myocardial perfusion in CAD.
• Each technique presents unique advantages and disadvantages that influence clinical application.
• MRI is emerging as a significant non-ionizing option for detailed myocardial perfusion assessment.