In conclusion, CT Colonography has prospect to be good option of colorectal cancer screening considering a proper patent preparation, high quality training for both radiologist and CT technologist, highly cooperation from patients and updated CAD soft were
Basem AL Al Zahrany
How effective is CT Colonography in detecting colon cancer?
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The second cause leading to death in the United States is colorectal cancer in the same way colorectal cancer is the third common cancer in women and men. In the United States 135,260 people diagnosed with colorectal cancer in 2011. Colorectal cancer caused for 51,783 people from them the death. The number of colorectal cancer patients is predictable to rise in the future. Built on the present data, cost scenario and survival for colorectal cancer Yabroff et al expected the cost effect in 2020 for the primary $4.05 billion, making a significant cost load on the healthcare system. Colorectal cancer mortality was decreased by 18% to13 % with apply CT Colonography to detect colonic polyps before they developed to colorectal cancer (Trilisky et al, 2015). CT Colonography has been shown to have polyp discovery rates similar to the patient how use colonoscopy. CT Colonography is an exam for colorectal cancer screening which became generally effected for detecting polyps similar to those of colonoscopy. It has the prospective to improve colorectal cancer screening rates because of colorectal is come to be insignificant noninvasive ,faster patient in quantity ,no sedation requirement and potential for reduced cathartic examination . Appropriate program of a CT Colonography screening must implement and needs important announce to several aspects, counting proper patient preparation before the investigation, image acquisition, and post-processing of the developed images. A CT Colonography need workstation with special software and high quality monitors. Special software called Computer-Aided Detection CAD which is manipulate to reduce mistakes of spotting and showing polyps to the radiologist for images interpretation. These essay will discuss technique, advantages , disadvantages of CT Colonography and how CT Colonography can be affect for colorectal cancer .
Exam technique
Currently, patients go through intestine preparation procedure which has the purpose of avoid misdiagnosed of polyps by cleaning the colon. So far there is no agreement on a best program of food adjustment and releasing preparation of flexible period and amount. There is continuing studies aimed to rise patient relaxation and acceptance. To distinguish polyps from other residual the use usually fecal and fluid tagging with bowel laxative. Some time they do it with small quantity of both iodine-based contrast material and barium or one of them to improve the image and to eliminate the artifact of image which could be accrue ,which may rise the sensitivity of polyp detection, Digital subtraction is a post-acquisition processing technique use to improve the image quality(Trilisky,2015).
Advantages of CT Colonography
CT Colonography shows high sensitivity and specificity of detecting cancer lesions than colonoscopy. According to Perry Pickhardt(2015) the sensitivity of CT Colonography to detect lesion showed after a meta-analysis and systematic revision an overall 96% and it is coming higher if oral contrast is applied. This ratio give CT Colonography opportunity to use it for preventive and screening more than colonoscopy. In addition, colonoscopy y is invasive exam which might harmful the patients. However, this high percentage of detecting legion is my decay with lesions less than 6mm. Andrik, Aschoff (2007),fond after reviewing many studies don from 2000 until 2005 the specificity and sensitivity of catching of colon cancer is high with 10mm or more in size of polyps .He estimate that CT Colonography could increase sensitivity in this coming years and this is what happened now it is increase up to 6 mm for detection of polyps.
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