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Virtual colonoscopy
Virtual colonoscopy
Virtual colonoscopy
Virtual colonoscopy
Virtual colonoscopy
Virtual colonoscopy
Virtual colonoscopy
Virtual colonoscopy
Virtual colonoscopy
Virtual colonoscopy
Virtual colonoscopy
Virtual colonoscopy
Virtual colonoscopy
Virtual colonoscopy
Virtual colonoscopy
Virtual colonoscopy
Virtual colonoscopy
Virtual colonoscopy
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Virtual colonoscopy

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Medical imaging technique for colon

Medical imaging technique for colon

Published in: Health & Medicine
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  • 1. Virtual Colonoscopy 1
  • 2. What is virtual colonoscopy?        Medical imaging procedure. Also known as CT colonography. Non invasive procedure. uses x rays and computers. 2D and 3D images of rectum and entire colon. display them on a screen. can provide 3D reconstructed endoluminal views of the bowel. 2
  • 3. What are the rectum and colon? 3
  • 4. Colon  The colon is also called the large intestine 4
  • 5. Rectum  Final straight portion of the large intestine. 5
  • 6. Why the Test is Performed  Follow-up on colon cancer or polyps  Look for the cause of: • Abdominal pain, changes in bowel movements, or weight loss • anemia due to low iron • Blood in the stool • Screen for cancer of the colon 6
  • 7. Colon polyps An abnormal growth of tissue projecting from a mucous membrane 7
  • 8. How to Prepare for the Test  Patient need to empty bowels before the exam  patient will usually be asked to take laxatives or other oral agents at home the day before the procedure to clear stool from the colon. 8
  • 9. How the Test is Performed  Patient is asked to lie on his/her left side on a narrow table that is connected to an MRI or CT scan machine.  knees will be up towards the chest.  A small, flexible tube will be inserted into rectum.  Air is pumped through the tube to make the colon bigger and easier to see. After this is done, patient will be asked to lie in supine position. 9
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  • 11.  The table moves through the scanner to produce a series of two-dimensional cross-sections along the length of the colon.  A computer program puts these images together to create a three-dimensional picture that can be viewed on the video screen .  patient is asked to hold his/her breath during the scan to avoid distortion on the images.  The scan is then repeated with the patient lying in a prone position . 11
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  • 13. Direction of rotation Rotating x ray source Motorized platform 13
  • 14. Advantages  Virtual colonoscopy is less invasive, safer, and takes less time than a regular colonoscopy.  A thin tube to insert air into the colon is placed in the rectum rather than a long flexible tube that is moved up your colon.  Patients do not require anesthesia or sedation and can return home on their own or get back to work immediately after the test.  VC provides clearer, more detailed images 14
  • 15. Disadvantages a radiologist cannot take tissue samples (biopsy) or remove polyps during VC, so a conventional colonoscopy must be performed if abnormalities are found.  may not show polyps smaller than 10 mm  There is a slight risk that the CT scan can interfere with implanted or external medical devices.  15
  • 16. Risks The risks of virtual colonoscopy include  exposure to radiation and  perforation—a hole or tear in the lining of the colon. 16
  • 17. Bibliography  http://www.nlm.nih.gov/medlineplus/ency/ar ticle/007253.htm  http://digestive.niddk.nih.gov/ddiseases/pubs /virtualcolonoscopy/  http://en.wikipedia.org/wiki/Virtual_colonosc opy 17
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