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Cardiac imaging is an integral part of the evaluation of patients with all forms of heart disease. Unfortunately, each imaging modality, including nuclear cardiology, echocardiography, cardiovascular magnetic resonance imaging, cardiac computed tomography, coronary angiography, and cardiac positron emission tomography, has adopted its own separate and sometimes markedly differing nomenclature, as well as methods of orientation and segmentation of the heart. The lack of common nomenclature and views has resulted in difficulties in optimal patient management, communication between modalities, interpretation of results, and combined research. Attempts by several subspecialty organizations in the past have improved but not resolved these terminology issues. To ultimately resolve these differences, a remarkable committee was convened: The American Heart Association Writing Group on Myocardial Segmentation and Registration for Cardiac Imaging. This writing group was composed of members from the following organizations: the

Abstract-Atherosclerotic cardiovascular disease results in Ͼ19 million deaths annually, and coronary heart disease accounts for the majority of this toll. Despite major advances in treatment of coronary heart disease patients, a large number of victims of the disease who are apparently healthy die suddenly without prior symptoms. Available screening and diagnostic methods are insufficient to identify the victims before the event occurs. The recognition of the role of the vulnerable plaque has opened new avenues of