CT colonography : a guide for clinical practice by Schima, Wolfgang; Mang, Thomas; Graser, Anno

By Schima, Wolfgang; Mang, Thomas; Graser, Anno

"Highly potent as a minimally invasive diagnostic and screening instrument, CT colonography (CTC) is a vital a part of contemporary medical armamentarium. during this concise, step by step guidebook, written by way of experts who additionally run education classes in CT colonography, readers will discover a wealth of data for daily perform. From exam tools and picture interpretation, to screening and reporting matters, to Read more...

summary: "Highly potent as a minimally invasive diagnostic and screening instrument, CT colonography (CTC) is a crucial a part of modern scientific armamentarium. during this concise, step by step guidebook, written through experts who additionally run education classes in CT colonography, readers will discover a wealth of knowledge for daily perform. From exam equipment and picture interpretation, to screening and reporting matters, to universal errors and pitfalls to prevent, this compact e-book is all-inclusive, excellent for either rookies and more matured examiners who are looking to deepen their wisdom of this robust procedure. unique positive factors: complete dialogue of ways to start, together with symptoms and contraindications, sufferer training, CT exam ideas, and sufferer chance profile; techniques for facts research and medical interpretation, together with 2nd and 3D functions ("virtual" visualization), polyp dimension, and computer-assisted detection of polyps; informative, point-by-point sections on medical findings, beginning with general anatomy of the colon and relocating directly to universal illnesses, postoperative stipulations, pitfalls and artifacts, and extracolonic involvement; greater than four hundred extraordinary, absolutely classified illustrations (176 in full-color), together with basic CT scans and second and 3D reconstructions that reveal diagnostic standards, attainable differential diagnoses, and affliction states; directions for standardizing reviews and documenting findings; tips for developing a digital colonoscopy provider on your sanatorium or practice"--Provided by means of writer

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Dual-Energy CT for CT Colonography? Unlike a traditional CT scanner, dual-energy CT uses two rotating tubes at 95° to each other which are operated at different tube kilovoltages. By enlarging the field of view of the second detector from 26 to 33 cm, a second-generation dual-source CT scanner available since 2009 represents a new and improved piece of equipment for abdominal imaging. Other manufacturers offer dual-energy CT with only one tube and modulation of the tube current. In general terms, dual-energy CT takes advantage of the different absorption characteristics of the different tissues and elements within the scan field with varying atomic numbers by using photons of different energy levels.

Sue attenuation. Fig. 29 Differentiation of polyps in untagged residual fluid. Intravenous administration of contrast medium improves the visualization of polyps in untagged residual fluid. On a coronal 2D image, the contrast enhancement of the polyp (arrow) gives it a different density to the untagged residual fluid. 2 34 a 2 2 Examination b Fig. 30 a, b Contrast enhancement in chronic inflammatory bowel disease (Crohn disease). a Noncontrast CT shows moderate cirb After intravenous administration of a cumferential thickening of the wall of contrast agent, there is moderate enthe descending colon with fibrolipomahancement of the wall at the site of intous proliferation of pericolic fatty tissue flammation (arrowhead).

30). Evaluation of extracolonic involvement. Noncontrast lowdose studies limit the assessment of the liver, pancreas, spleen, kidneys, vessels, pelvic organs, and lymph nodes. Extracolonic pathological findings are more frequent and are better classified when one scan is acquired with a standard dose (100–200 mAs) and administration of an intravenous contrast medium. Such protocols are not recommended for screening studies, however, due to the Fig. 27 a, b Effect of intravenous contrast on polyps.

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