Image Selection
Clinically indicated CCTAs previously performed at Temple University Hospital from September 2016 to December 2020 were reviewed. Patients were excluded if the imaging study was inadequate for visualization of the septal perforator artery or right ventricular (RV) apex. Patients with prior coronary artery bypass grafting (CABG) were also excluded to minimize effects of grafting on the localization of the first septal perforator artery.