Diagnostic Performance of Dynamic Myocardial Perfusion Imaging Using Dual-Source Computed Tomography

Area of Science:

• Cardiovascular Imaging
• Radiology
• Medical Diagnostics

Background:

• Single-center studies suggested high accuracy for dynamic computed tomography perfusion (CTP) in diagnosing coronary artery disease (CAD).
• The need for multicenter validation of CTP's diagnostic performance in conjunction with coronary computed tomography angiography (CTA) was identified.

Purpose of the Study:

• To prospectively evaluate the diagnostic performance of combined coronary CTA and dynamic CTP for detecting hemodynamically significant CAD.
• To compare the diagnostic accuracy of combined CTA and CTP against CTA alone, using invasive coronary angiography (ICA) with fractional flow reserve (FFR) as the gold standard.

Main Methods:

• A prospective multicenter study enrolled 174 patients with suspected or known CAD referred for ICA.
• Coronary CTA and dynamic CTP were performed using dual-source CT prior to ICA.
• Fractional flow reserve (FFR) was measured during ICA for stenoses between 26% and 90% diameter reduction.

Main Results:

• The study included 157 participants, with 48% (76/157) having hemodynamically significant stenosis.
• Adding dynamic CTP to CTA significantly increased the area under the curve from 0.65 to 0.74 (P=0.011).
• Overall accuracy improved from 64% to 74% (P<0.001) with dynamic CTP, despite decreased sensitivity (93% to 72%) and improved specificity (36% to 75%).

Conclusions:

• The combination of coronary CTA and dynamic CTP enables more accurate identification of hemodynamically significant CAD than CTA alone.
• Further investigation is required to determine the clinical significance and prognostic impact of this combined imaging approach.