Assessment of coronary flow reserve using single photon emission computed tomography with technetium 99m-labeled...

Area of Science:

• Cardiology
• Nuclear Medicine
• Medical Imaging

Background:

• Coronary artery disease (CAD) functional evaluation relies on assessing coronary flow reserve (CFR).
• Invasive methods like Doppler ultrasound and pressure-derived techniques directly measure CFR but are invasive.
• Noninvasive techniques for quantifying myocardial blood flow and CFR have advanced significantly.

Purpose of the Study:

• To review the merits and limitations of cardiac SPECT imaging using Tc-99m tracers for CFR measurement.
• To explore the potential clinical applications of noninvasive CFR assessment in CAD.

Main Methods:

• Review of existing literature on invasive and noninvasive CFR assessment techniques.
• Focus on cardiac Single Photon Emission Computed Tomography (SPECT) with Tc-99m tracers.
• Analysis of Positron Emission Tomography (PET) as a validated but complex noninvasive CFR quantification method.

Main Results:

• Positron emission tomography provides accurate, validated absolute CFR measurements but is costly and complex for routine use.
• Technetium 99m-labeled tracers are widely used for myocardial perfusion SPECT in CAD.
• Recent efforts aim to estimate CFR using SPECT tracers for noninvasive functional assessment.

Conclusions:

• Cardiac SPECT imaging with Tc-99m tracers presents a developing noninvasive approach for CFR quantification in CAD.
• This technique holds potential for routine clinical application in assessing CAD severity and guiding therapy.
• Further analysis of its relative merits and limitations is crucial for widespread adoption.