A recent study adopted a method to quantify myocardial ischemia and the subtended myocardial mass using adenosine stress CT myocardial perfusion (CTP). The study demonstrated the feasibility of adenosine stress CTP for this quantification and the validity of the proposed method to correlate coronary artery lesions to the areas of myocardial hypoperfusion observed at coronary CT angiography and adenosine stress CTP.