MDCT images of the heart without contrast enhancement. (A) without coronary artery calcifications. (B) Patient with calcification of the left anterior descending artery (arrow) and the intermediate branch. (Reprinted with permission from Gerber T, Walser E. Cardiovascular computed tomography and magnetic resonance imaging. In: Murphy JL, editor. Mayo Clinic Cardiology Concise Textbook. London, New York: Williamson, Lippincott and Wilkins, 2006. p. 185–204.)