CT coronary angiography: coronary CT-flow quantification supplements morphological stenosis analysis.

Area of Science:

• Cardiovascular imaging
• Medical physics
• Radiology

Background:

• Evaluating 64-slice CT scanners for accurate coronary artery flow profile measurement.
• Assessing CT flow measurements for classifying stenosis significance and hemodynamic relevance.
• Supplementing morphological stenosis analysis with functional CT parameters.

Purpose of the Study:

• To determine if a 64-slice CT scanner can accurately measure coronary artery flow profiles.
• To assess the suitability of CT flow measurements for classifying stenosis severity.
• To evaluate CT flow measurements as a functional parameter for stenosis analysis.

Main Methods:

• Prospective study of 50 patients undergoing coronary CTA and invasive coronary angiography (ICA).
• CT flow measurements using a 64-slice scanner with contrast media bolus.
• Analysis of time-density curves and slope ratios, compared with ICA findings.

Main Results:

• 47 of 50 CT flow measurements were evaluable.
• Strong correlation (R²=0.92) between stenosis degree and slope ratios.
• Identified a threshold corridor (0.55-0.77) for distinguishing hemodynamically significant stenoses.

Conclusions:

• CT-based coronary artery flow measurements (CTFM) correlate well with angiographic stenosis.
• CTFM non-invasively enhances the diagnostic accuracy of coronary CTA.
• CTFM is a suitable method for quantifying coronary blood flow, with clinical and scientific value.