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Previous Volume 357:2277-2284 November 29, 2007 Number 22 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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The advent of computed tomography (CT) has revolutionized diagnostic radiology. Since the inception of CT in the 1970s, its use has increased rapidly. It is estimated that more than 62 million CT scans per year are currently obtained in the United States, including at least 4 million for children.¹

By its nature, CT involves larger radiation doses than the more common, conventional x-ray imaging procedures (Table 1). We briefly review the nature of CT scanning and its main clinical applications, both in symptomatic patients and, in a more recent development, in the screening of asymptomatic patients. We focus . . . [Full Text of this Article]

CT and Its Use

Common Types of CT Scans

Radiation Doses from CT Scans

Quantitative Measures

Typical Organ Doses

Biologic Effects of Low Doses of Ionizing Radiation

Mechanism of Biologic Damage

Risks Associated with Low Doses of Radiation

Cancer Risks Associated with CT Scans

Conclusions

Source Information

From the Center for Radiological Research, Columbia University Medical Center, New York.

Address reprint requests to Dr. Brenner at the Center for Radiological Research, Columbia University Medical Center, 630 W. 168th St., New York, NY 10032, or at djb3@columbia.edu.

Related Letters:

Computed Tomography and Radiation Exposure
Tubiana M., Nagataki S., Feinendegen L. E., Dimitroyannis D. A., Frush D. P., Goske M. J., Hernanz-Schulman M., Soyer P., Varnholt H., Brenner D. J., Hall E. J.
Extract | Full Text | PDF  
N Engl J Med 2008; 358:850-853, Feb 21, 2008. Correspondence

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