Previous coronary artery bypass graft surgery
Serum creatinine levels >1.8 mg/dl
Second- and third-degree heart block
Systolic blood pressure of < 90 mmHg
Heart Failure with New York Heart Association class III-IV
Recent myocardial infarction (within 3 months)
≥2 implanted coronary metallic stents
Unstable angina within 24 hours of CTA or dPET
Significant coronary artery disease prohibits safe physiological assessment during catheterization
History of allergy to iodinated contrast
Significant arrhythmias or tachycardia
History of frequent asthma attacks or active wheezing
History of claustrophobia
Women who are pregnant or breastfeeding