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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