Infarct detection with a comprehensive cardiac CT protocol

Area of Science:

• Cardiovascular Imaging
• Radiology
• Medical Diagnostics

Background:

• Cardiac CT offers potential for comprehensive myocardial infarction (MI) detection through regional wall motion abnormalities (RWMA), rest perfusion defects (RPD), and delayed contrast enhancement (DCE).
• The diagnostic accuracy of these cardiac CT techniques for MI detection remains largely unknown.

Purpose of the Study:

• To evaluate the diagnostic accuracy of individual and combined cardiac CT techniques for myocardial infarction (MI) detection.
• To compare the accuracy of RWMA, RPD, and DCE assessed by cardiac CT against the universal definition of MI.

Main Methods:

• A prospective study enrolled 48 patients with suspected coronary artery disease for a 64-detector row dual-source cardiac CT protocol.
• The protocol included cine for RWMA, first-pass for RPD, and delayed imaging for DCE, with blinded reader assessment.
• The 2007 American Heart Association universal definition of MI served as the gold standard.

Main Results:

• Fifty percent of patients (24/48) were diagnosed with MI based on the universal definition.
• Combined CT analysis achieved 90% accuracy, with 88% sensitivity and 92% specificity for per-patient MI detection.
• Individual techniques showed lower accuracy: RWMA (79%), RPD (67%), and DCE (79%). A combination of DCE and cine demonstrated 85% accuracy and 92% sensitivity.

Conclusions:

• Cardiac CT is a feasible method for infarct detection with good diagnostic accuracy when compared to the universal definition of MI.
• A combined evaluation incorporating cine, RPD, and DCE provides the highest diagnostic accuracy for MI detection.
• These findings support the integration of multiple CT techniques in future protocols for optimal MI detection.