Titlebook: Atlas of Virtual Colonoscopy; Abraham H. Dachman (Professor of Clinical Radiolog Book 20031st edition Springer Science+Business Media New

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Background and Significanceincluding earlier diagnosis, progress in therapeutic interventions, and, possibly, prevention. However, the impact has not been dramatic. The primary explanation is that our advances in knowledge and technology have not been implemented on a programmatic population basis. This deficiency has resulte

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How Accurate Is CT Colonography?ive detection of colorectal polyps and cancer. Since the introduction of CTC in 1994, multiple preliminary studies have been performed to evaluate the sensitivity and specificity of CTC in different patient cohorts. During this time, there have been tremendous advances in the image acquisition and d

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Patient Preparationimaging to achieve its full diagnostic potential. Properly performed, the preparatory steps of CTC contribute to high sensitivity for detection of polyps and can be obtained with a minimum of patient discomfort. In this chapter, we will focus on two topics central to achieving a high-quality exam: p

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MR Colonography during their lifetime (Neuhaus 1999). The majority of colon cancers develop from nonmalignant adenomas or polyps (O’Brien et al. 1990). Thus, cancer screening programs targeting precancerous polyps with subsequent endoscopic polypectomy could significantly reduce the incidence and hence the mortali

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Future Directions: Computer-Aided Diagnosisetation, diagnostic performance, and perceptual error have yet to be addressed. A number of researchers around the world have embarked on a project to develop computer-aided diagnosis (CAD) of colonic polyps to address these potential obstacles to further use of CTC. In this chapter, we briefly revi

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A Word About Radiation Doseone decade after CT was revolutionized by the advent of spiral/helical CT technology, multislice CT (MDCT) was introduced, offering better longitudinal and temporal resolution. These benefits improve nearly all imaging applications in which broad anatomic coverage is required in a breath hold, inclu

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Normal Anatomyble evaluating the colon in “soft-copy” format in the axial plane and as multi-planar and endoluminal reconstructions. This chapter focuses on normal colorectal anatomy and normal variants as seen on CTC.

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Flat Lesionsdically or in patients with hereditary nonpolyposis syndrome (Lynch et al. 1992). Flat adenomas may represent from 8% to one third of all adenomas and early carcinomas in some reports, and are clinically important as these lesions may have a higher proportion of high-grade dysplasia than polypoid ad