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	Virtual Colonoscopy
		A virtual colonoscopy can be used to screen for precancerous and cancerous growths in the colon or rectum (colorectal cancer), such as polyps or tumours (colorectal cancer).
		Virtual colonoscopy (more accurately called computed tomography colonography, or CTC) is a new test that is being studied to determine whether the results are as accurate as a regular colonoscopy.
		Virtual colonoscopy is being studied to determine whether the results are as accurate (sensitivity) as a regular colonoscopy.
	www.peacehealth.org /kbase/topic/special/tw10203/sec1.htm (902 words)

	What's Virtual Colonoscopy
		Virtual colonoscopy is a new method that allows doctors to look at the large bowel (colon) to detect polyps and cancers.
		Virtual colonoscopy is a recently developed technique that uses a CT scanner and computer virtual reality software to look inside the body without having to insert a long tube (Conventional Colonoscopy) into the colon or without having to fill the colon with liquid barium (Barium Enema).
		Virtual colonoscopy uses a standard computed tomography (CT or CAT scan) of the abdomen, which allows radiologists (special physicians with advanced training in x-ray imaging) to create pictures on the computer that look similar to those seen by Conventional Colonoscopy.
	www.virtualcolonoscopy.net /whatsvirtual.htm (666 words)

	VIRTUAL COLONOSCOPY
		The use of virtual colonoscopy in detecting colorectal polyps and its comparison to conventional colonoscopy has been investigated in several studies. Depending on the authors and their respective background the studies and outcomes can be somewhat different. The following is a review of articles supporting virtual colonoscopy as a possible screening test for colorectal cancer.
		Virtual colonoscopy also failed to detect one 8 mm flat adenoma in the cecum, telangiectasisas and colonic lesions in a patient with portal hypertension; it also missed ulcers in the left colon in two patient’s with Crohn’s disease and signs of ulcerative proctosigmoiditis in three patients.
		If virtual colonoscopy measures to be an accurate, reliable and cost-effective method for detecting adenomas and early carcinomas, it could potentially affect the general population’s participation in screening programs and could eventually be a useful adjunct as a first-line screening technique for colorectal cancer.
	intmedweb.wfubmc.edu /grand_rounds/2001/virtualcolon.html (2270 words)

	Virtual colonoscopy - Wikipedia, the free encyclopedia
		Virtual colonoscopy (VC) is a Medical imaging procedure which uses x-rays and computers to produce two- and three-dimensional images of the colon (large intestine) from the lowest part, the rectum, all the way to the lower end of the small intestine and display them on a screen.
		The patient may resume normal activity after the procedure, but if abnormalities are found and the patient needs conventional colonoscopy, it may be performed the same day.
		Furthermore Virtual Colonoscopy performed with CT exposes the patient to ionizing radiation, however some research has demonstrated that ultra-low dose VC can be just as effective in demonstrating colon and bowel disease due to the great difference in x-ray absorption between air and the tissue comprising the inner wall of the colon.
	en.wikipedia.org /wiki/Virtual_colonoscopy (531 words)

	Boston.com / Your Life / Health & Fitness / Diseases & Treatments / Researchers boost `virtual' colonoscopy
		In addition, the virtual colonoscopy, which scans the entire abdominal region, found five cancers outside the colon, as well as several problems in blood vessels, kidneys, and gallbladders.
		Virtual colonoscopies involve the same pretest preparations as colonoscopies, including maintaining a liquid diet for up to three days and taking strong laxatives the night before the procedure.
		Virtual colonoscopy evolved over the last decade, as physicians and cancer specialists experimented with powerful CT scanning devices to detect potentially malignant growths in hard-to-reach regions of the body.
	www.boston.com /yourlife/health/diseases/articles/2003/12/02/researchers_boost_virtual_colonoscopy (833 words)

	UCSF - Radiology - Virtual Colonoscopy
		Virtual colonoscopy, also referred to as CT colonography, is a minimally invasive imaging technique that combines volumetrically acquired helical CT scan data with advanced graphical software to create two and three-dimensional views of the colon.
		Virtual colonoscopy has value in evaluating the proximal colon when fiberoptic colonoscopy is unsuccessful due to a distal obstructing lesion or colonic tortuosity.
		Virtual colonoscopy must be a cooperative effort between radiologists, gastroenterologists and colorectal surgeons to ensure that there is an easy and effective referral system for patients who are found to have a lesion.
	www.radiology.ucsf.edu /research/01virtual_colonoscopy.shtml (1088 words)

	Virtual Colonoscopy: Not Ready For Prime Time - Swedish MC, Seattle, Washington, WA
		Virtual colonoscopy is a noninvasive procedure that allows a doctor to examine computer-generated images of the colon.
		The researchers found that the sensitivity of virtual colonoscopy was 39% for detecting precancerous or cancerous polyps at least six mm in size and 55% for detecting precancerous or cancerous polyps at least 10 mm or greater in size.
		Virtual colonoscopy correctly identified 90.5% of the participants who did not have polyps at least six mm in size, whereas conventional colonoscopy identified 100% of these participants.
	www.swedish.org /17487.cfm (826 words)

	NYU Virtual Colonoscopy
		Virtual colonoscopy is an evolving non-invasive imaging technique that allows doctors to detect colorectal polyps (growths) and cancers.
		However, the amount of radiation used in CT for virtual colonoscopy can be substantially lower than the amount used for routine abdominal and pelvic CT (3).
		In either case, whether CT or MR is used, certain common characteristics of virtual colonoscopy exams have emerged since the procedure was first performed in 1994 (4).
	www.med.nyu.edu /virtualcolonoscopy/virtualcolon (203 words)

	Virtual Colonoscopy: a New Screening Technique for Colorectal Cancer
		Virtual colonoscopy is a new computer-assisted technology that projects a three-dimensional image of the colon onto a computer screen.
		Virtual colonoscopy is one way science can provide more accurate and more comfortable screening.
		Currently, virtual colonoscopy is most often performed in clinical trials designed to establish whether this type of testing is an effective method for colorectal cancer screening.
	healthlink.mcw.edu /article/976669027.html (1796 words)

	Model predicting colorectal cancer screening suggests higher mortality for virtual colonoscopy
		The analyses, conducted by researchers from Oregon Health and Science University and the Portland VA Medical Center, found that virtual colonoscopy, a test for colorectal cancer that relies on a CT scan of the abdomen and pelvis, carries significant radiation exposure and is less likely to detect cancer or pre-cancerous growths in the colon.
		Rather, the rate of complications for virtual colonoscopy is higher than expected because most of those follow-up colonoscopies are likely to involve the removal of polyps, which increases the likelihood of complications.
		The four largest studies of virtual colonoscopy have been published in the last year, and three of the four studies showed very poor results for virtual colonoscopy compared to colonoscopy.
	www.eurekalert.org /pub_releases/2004-11/acog-mpc102604.php (823 words)

	Virtual Colonoscopy
		Virtual colonoscopy takes the information produced by a CT scanner and processes this information to produce an image of the colon's inner surface.
		Because virtual colonoscopy cannot characterize a polyp when identified, it is necessary to then perform a standard colonoscopy.
		While the accuracy of VC is equivalent to regular colonoscopy in polyps greater than 7 to 8 mm, VC is not as good as regular colonoscopy for smaller polyps.
	clevelandclinic.org /health/health-info/docs/3400/3407.asp?index=11553 (1761 words)

	Virtual Colonoscopy FAQ
		Virtual Colonoscopy is a CT scan test consisting of CT Abdomen and CT Pelvis with air contrast, and 3d reconstruction.
		Patients describe Virtual Colonoscopy as uncomfortable with mild cramping (but not painful) when the colon is being filled with air.
		Virtual Colonoscopy has been shown to be as good as conventional flexible colonoscopy in detecting clinically significant polyps and cancers.
	www.ldcmri.com /html/virtual_colonoscopy_faq.html (585 words)

	CNN.com - The benefits of a 'virtual' colonoscopy - Dec. 1, 2003
		The virtual colonoscopy study was to be presented Monday in Chicago at the annual meeting of the Radiological Society of North America.
		Virtual colonoscopy found polyps that were at least 10 millimeters in diameter 93.8 percent of the time and discovered growths of at least 8 millimeters 93.9 percent of the time.
		In comparison, conventional colonoscopy found polyps that were at least 10 millimeters in diameter 87.5 percent of the time and discovered growths of at least 8 millimeters 91.5 percent of the time.
	www.cnn.com /2003/HEALTH/12/01/virtual.colonoscopy.ap/index.html (675 words)

	American Roentgen Ray Society - Anonymous (Site not responding. Last check: 2007-10-30)
		Virtual colonoscopy can effectively detect flat lesions in the colon, a study of more than 1,200 patients shows.
		The study results lay to rest concerns that virtual colonoscopy should not be used as a screening tool to detect colon cancer because it can’t detect these lesions, the study authors say.
		However this study found that virtual colonoscopy detected 80% of the flat lesions (47 of 59 lesions) that were 6mm or more in size.
	www.arrs.org /scriptcontent/pressroom/archive/2004/r041101a.cfm (350 words)

	Virtual Colonoscopy Not Ready for Widespread Use
		One hospital that had a lot of experience with virtual colonoscopy had an 82% detection rate using this technique, but at the other 8 hospitals, the combined detection rate was just 24%.
		Because virtual colonoscopy is less invasive than standard colonoscopy, it has been touted as having the potential to increase the persistently low levels of colon cancer screening in the US.
		Virtual colonoscopy could gain an edge, Cotton said, if techniques can be developed to eliminate the bowel preparation and simplify the process of interpreting the computerized images of the colon.
	www.seniorjournal.com /NEWS/Health/4-04-29colonoscopy.htm (1214 words)

	Virtual Colonoscopy
		This study found that virtual colonoscopy is as good as optical colonoscopy for the detection of clinically relevant lesions.
		Virtual (CT) Colonoscopy is the latest technological advance in CT scanning and allows excellent images of the colon without the risks and inconvenience of anesthesia.
		The test is almost as sensitive as conventional colonoscopy, and it allows visualization of the junction between the small intestine and the large intestine (right colon), an area that is not completely visualized 10 to 15% of cases with conventional colonoscopy.
	www.ldcmri.com /html/virtual_colonoscopy.html (947 words)

	Virtual Colonoscopy An Effective Screening Tool - National Cancer Institute
		In a study of people at average risk for colorectal cancer, a screening technique known as virtual colonoscopy was just as accurate as traditional colonoscopy at detecting potential signs of colon or rectal cancer, and was less invasive.
		In a colonoscopy, the patient is sedated and the doctor views the walls of the rectum and colon by inserting a thin, lighted tube and studying the projected images on a video monitor.
		Virtual colonoscopy, also known as CT colonography, uses an x-ray machine linked to a computer to generate unique 2- and 3-D images of the colon and rectum that can be manipulated for better viewing angles and stored for later study.
	www.cancer.gov /clinicaltrials/results/virtual-colonoscopy1203 (783 words)

	Heart Check America's - Virtual Colonoscopy
		Traditional colonoscopy typically visualizes only 80% of the interior colon, as it is unable to see behind colon folds, where polyps may hide.
		Virtual Colonoscopy requires the insertion of a 1 inch catheter to allow for the introduction of carbon dioxide to inflate the colon.
		Virtual Colonoscopy does not require anesthesia, and therefore the patient can resume normal activities immediately after this 30 minute procedure.
	www.heartcheckamerica.com /colon.htm (377 words)

	VIRTUAL COLONOSCOPY
		Early detection of clinically significant polyps and cancer with virtual colonoscopy allows for treatment at a stage when the disease can be prevented or even cured.
		The colonoscope in traditional colonoscopy is not able to reach all portions of the colon in 5-15% of patients.
		Unlike a standard colonoscopy, no sedative or anesthesia is needed, allowing the patient to drive home or return to work after the procedure.
	cpmcnet.columbia.edu /dept/radiology/eastside/imaging/colonoscopy.html (357 words)

	Virtual Physical - What is a Virtual Colonoscopy
		The Virtual Colonoscopy is a new method of imaging the entire colon that is simpler, faster, and less invasive than conventional colonoscopy.
		A New England Journal of Medicine article (Boston University, November, 1999) comparing virtual colonoscopy to conventional colonoscopy concluded virtual colonoscopy to "have similar efficacy for the detection of polyps" that are likely to be cancerous.
		A Virtual Colonoscopy is contraindicated in patients with rectal bleeding, history of diverticulitis, Crohn's Disease or those who have a recent colonoscopy with positive findings.
	www.virtualphysical.com /index_virtualcolonoscopy.html (393 words)

	Middlesex Hospital: Virtual Colonoscopy
		Virtual colonoscopy is a promising new screening test for colorectal cancer.
		Virtual colonoscopy eliminates the need to insert a long tube into the colon (as with Conventional Colonoscopy) or fill the colon with liquid barium (as with Barium Enema).
		Virtual colonoscopy is an alternative to, not substitute for, conventional colonoscopy.
	www.midhosp.org /go/9D865C7C-9096-AC88-60AAC877B9C53B59 (756 words)

	Virtual Colonoscopy in Newport Beach, CA
		Virtual Colonoscopy is a fantastic new test that gives doctors a new way to look inside the colon for the detection polyps and cancers.
		Research has shown that Virtual Colonoscopy is better able to see polyps than barium enema and is just as accurate as conventional colonoscopy.
		Colon screening by Virtual Colonoscopy should be as basic and instinctive as a mammogram for women or a PSA for men once that certain age is reached.
	www.newportbodyscan.com /VirtualColonoscopy.htm (765 words)

	Virtual Colonoscopy Raises Issues for Further Study
		It is "virtual" because the images are produced using radiation and evaluated on a computer screen, while a standard colonoscopy uses a thin, flexible lighted viewing tube (a colonoscope) that is threaded slowly through the colon to examine the lining for polyps.
		Unlike standard colonoscopy, virtual colonoscopy only provides images of the colon, but does not allow for immediate biopsy or polyp removal at the time of the exam.
		Colonoscopy is safe and accurate when performed by a fully-trained endoscopist." For more information, contact the ASGE at http://www.askasge.org or call 1-866-305-ASGE.
	www.prnewswire.com /cgi-bin/stories.pl?ACCT=104&STORY=/www/story/11-26-2004/0002512188&EDATE= (552 words)

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