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©2013 UpToDate ® Print Email Adult screening effective doses Procedure Modality Average effective dose (mSv) Number of chest x-rays (PA/lateral) with equivalent radiation dose* Dual x-ray absorpitometry (DEXA) Conventional radiography 0.001 0.01 Dual x-ray absorpitometry with CT Computed tomography 0.04 0.4 Mammogram (2 views) Conventional radiography 0.4 4 CT coronary calcium score Computed tomography 3 30 CT colonography (virtual colonoscopy) Computed tomography 10 100 Whole body screening CT Computed tomography 12 120 * PA and lateral chest radiograph = .1 mSv. Data from: Mettler, FA, Huda, W, Yoshizumi, TT, Mahesh, M. Effective doses in radiology and diagnostic nuclear medicine: a catalog. Radiology 2008; 248:254. Smith-Bindman, R, Lipson, J, Marcus, R, et al. Radiation dose associated with common computed tomography examinations and the associated lifetime attributable risk of cancer. Arch Intern Med 2009; 169:2078. Shrimpton, PC, Hillier, MC, Lewis, MA, Dunn, M. National survey of doses from CT in the UK: 2003. Br J Radiol 2006; 79:968. Diederich, S, Lenzen, H. Radiation exposure associated with imaging of the chest: comparison of different radiographic and computed tomography techniques. Cancer 2000; 89:2457. Brenner, DJ, Elliston, CD. Estimated radiation risks potentially associated with full-body CT screening. Radiology 2004; 232:735.