Cardiac Computed Tomography Coronary Angiography Post Non-diagnostic or Equivocal Myocardial Perfusion SPECT

Background: Myocardial perfusion single- photon emission computed tomography (MP-SPECT) plays a key role in the management of patients with known or suspected coronary artery disease (CAD).However, Infrequently, MP-SPECT is non-diagnostic or equivocal. Computed Tomography coronary angiography (CTCA) has high diagnostic accuracy and excellent negative predicted value .The goal of the study is to investigate the diagnostic value of CTCA after non-diagnostic, equivocal, and or borderline abnormal MP-SPECT.