CT-based myocardial ischemia evaluation: quantitative angiography, transluminal attenuation gradient, myocardial...

Area of Science:

• Cardiovascular Imaging
• Interventional Cardiology
• Radiology

Background:

• Hemodynamically significant stenosis detection is crucial for guiding revascularization and improving patient outcomes.
• Fractional flow reserve (FFR) via invasive coronary angiography is the gold standard for functional assessment.
• Anatomic assessment by coronary computed tomography angiography (CCTA) alone has limitations in predicting functional significance.

Purpose of the Study:

• To review advanced CCTA analysis methods for detecting hemodynamically significant coronary stenosis.
• To compare the diagnostic performance, strengths, and limitations of novel CCTA techniques.
• To provide an overview of recent clinical studies validating these methods.

Main Methods:

• Review of studies evaluating quantification of coronary plaque, transluminal attenuation gradient (TAG), CT myocardial perfusion (CTP), and CT-derived FFR.
• Analysis of data acquisition, interpretation, and diagnostic accuracy of each method.
• Synthesis of strengths and limitations of each advanced CCTA technique.

Main Results:

• Conventional CCTA (diameter stenosis ≥50%) shows poor correlation with FFR, especially in challenging cases (small arteries, poor image quality, high calcium).
• Advanced CCTA methods like plaque quantification, TAG, CTP, and CT-derived FFR demonstrate potential for improved diagnostic performance.
• Each advanced method presents unique advantages and disadvantages that influence clinical applicability.

Conclusions:

• Sophisticated CCTA analysis methods offer promising non-invasive alternatives for identifying hemodynamically significant coronary stenosis.
• These techniques aim to overcome the limitations of conventional CCTA, enhancing specificity and positive predictive value.
• Further clinical validation and standardization are essential for widespread adoption in patient management.