1980;65:1210 21. 88. Goldman L, Cook EF, Mitchell N, et al. Incremental value of the exercise test for diagnosing the presence or absence of coronary artery disease. Circulation. 1982;66:945 53. 89. Melin JA, Wijns W, Vanbutsele RJ, et al. Alternative diagnostic strategies for coronary artery disease in women: demonstration of the usefulness and efficiency of probability analysis. Circulation. 1985;71: 535 42. 90. Diamond GA, Kaul S. Low diagnostic yield of elective coronary angiography. N Engl J Med. 2010;363:93 5. 91. Fleischmann KE, Hunink MG, Kuntz KM, et al. Exercise echocardi- ography or exercise SPECT imaging? A meta-analysis of diagnostic test performance. JAMA. 1998;280:913 20. 92. Cheng VY, Berman DS, Rozanski A, et al. Performance of the Tradi- tional Age, Sex, and Angina Typicality-Based Approach for Estimating Pretest Probability of Angiographically Significant Coronary Artery Disease in Patients Undergoing Coronary Computed Tomographic Angiography: results from the Multinational Coronary CT Angiography Evaluation for Clinical Outcomes: An International Mul- ticenter Registry (CONFIRM). Circulation. 2011;124:2423 32. 93. Berrington de Gonzalez A, Mahesh M, Kim K-P, et al. Projected cancer risks from computed tomographic scans performed in the United States in 2007. Arch Intern Med. 2009;169:2071 7. 94. Gerber TC, Gibbons RJ. Weighing the risks and benefits of cardiac imaging with ionizing radiation. J Am Coll Cardiol Cardiovasc Imaging. 2010;3:528 35. 95. Berrington de Gonzalez A, Kim K-P, Smith-Bindman R, et al. Myo- cardial perfusion scans: projected population cancer risks from current levels of use in the United States. Circulation. 2010;122:2403 10. 96. Halliburton SS, Abbara S, Chen MY, et al. SCCT guidelines on radiation dose and dose-optimization strategies in cardiovascular CT. J Cardiovasc Comput Tomogr. 2011;5:198 224. 97. Cerqueira MD, Allman KC, Ficaro EP, et al. Recommendations for reducing radiation exposure in myocardial perfusion imaging. J Nucl Cardiol. 2010;17:709 18. 98. 