Mechanisms of hyperenhancement in myocardial infarction: Scar may be the result of chronic infarction or nonischemic damage (see text for details). Adapted from Kim RJ, Elliott MD, Judd RM. Assessment of Myocardial Viability by Contrast Enhancement. In: Higgins CB, de Roos A, eds. MRI and CT of the Cardiovascular System. 2nd ed. Philadelphia, PA: Lippincott Williams & Wilkins; 2005.