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

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

summary: "Highly powerful as a minimally invasive diagnostic and screening instrument, CT colonography (CTC) is a vital a part of modern day 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 data for daily perform. From exam tools and picture interpretation, to screening and reporting concerns, to universal error and pitfalls to prevent, this compact publication is all-inclusive, excellent for either rookies and more matured examiners who are looking to deepen their wisdom of this robust process. precise good points: complete dialogue of the way to start, together with symptoms and contraindications, sufferer training, CT exam innovations, and sufferer hazard profile; ideas for information research and scientific interpretation, together with 2nd and 3D purposes ("virtual" visualization), polyp size, 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 marvelous, totally categorised illustrations (176 in full-color), together with basic CT scans and second and 3D reconstructions that reveal diagnostic standards, attainable differential diagnoses, and ailment states; directions for standardizing studies and documenting findings; advice for establishing a digital colonoscopy carrier on your hospital or practice"--Provided by means of writer

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Additional CT Scans Additional CT scans may be needed if segments of the colon cannot be adequately distended with the patient in both the prone and supine positions, or if accurate evaluation of lesions is impossible due to residual fluid. Which of the sides is advantageous for the quality of the examination should be decided by the examiner on an individual basis. For better visualization of the left colon, it is preferable to have the patient lying on the right side, and the right colon can be better visualized when the patient is lying on the left side.

Conclusion. To summarize, low-dose protocols with higher spatial resolution are advised for CT colonography. The protocol must be adapted to the scanner type, using the narrowest-possible collimation as well as dose-modulation techniques. These measures can lower the CT radiation dose by more than 50% below that of a standard abdominal examination. A further reduction is possible in ultra-low-dose protocols; however, this severely limits or even prevents the evaluation of extracolonic organs. Dual-Energy CT for CT Colonography?

In addition to a low-residue diet, the patient must consume several vials of an oral contrast agent (barium or Gastrografin) 72–24 hours before the planned CT colonography. There is no need for administration of a preparation that acts solely as a laxative. For CT colonography the colon is distended with air or carbon dioxide. Preliminary results have been reported with a protocol developed by the working group of Lefere and colleagues. Oral administration of 50 mL of 40% barium suspension, taken as divided doses during the day before the scheduled examination, and combined with a low-residue diet, resulted in good contrast enhancement of stool.

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