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Department of Radiology, Hospital of the University of Pennsylvania, PA. Received for publication September 20, 2010; accepted September 20, 2010. This article was published previously in the ARRS 2009 US Course Syllabus. Reprinted with permission from the American Roentgen Ray Society. Reprints: Anna S. Lev-Toaff, MD, FACR, Department of Radiology, Hospital of the University of Pennsylvania, 3400 Spruce Street, Founders 1, Philadelphia, PA 19104 (e-mail: [email protected]; [email protected]).
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Allison et al. (2010) studied this question.
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