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CT COLONOSCOPY
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- 2. CT colonoscopyor virtual colonoscopy is a medical imaging procedure which uses x-rays and computers to produce two and three dimensional image of the colon. It includes images of large intestine,small intestine, rectum CT colonoscopy is mainly used to evaluate colorectal polyp detection, and it may be used for colorectal screening
- 5. Screening forpolyps Incomplete colonoscopy Colorectal cancer
- 6. Pregnancy Presenceof barium in the bowel
- 7. Information aboutthe procedure Instruct the patient to remove all the metallic objects from the part of interest The patient will usually be asked to take laxatives or other oral agents at home the day before the procedure .
- 8. The patientis placed in a supine position on the examination table. A thin tube is inserted into the rectum , so the air can be pumped through the tube in order to inflate the colon for better viewing
- 9. The tablemoves 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 pictures that can be viewed on the video screen. The patient is asked to hold his/her breath during the scan to avoid distortion on the images
- 10. The scanis then repeated with the patient lying in a prone position. After the examination , the images produced by the scanner must be processed in to a 3d images. The patient may resume normal activity after the procedure.
- 11. PROTOCOL ABDOMEN SCANOGRAM SupainAP Patient position/land mark supain feet first/xiphoid process Start location mediastinum End location Pubic symphysis Slice thickness 5 mm Increment 5 mm Scan direction Caudo -cranial Scan type helical Gantry ankle None Resolution 512x512 matrix Post processing VR,MPR kV 120 mAs 250 Filter standard
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- 13. Three dimensionalnavigator 3D colon Fly through
- 14. The navigatoradvanced visualization software provides a single icon-driven interface for ease of use and interaction with virtual colonoscopy images. It allows real time navigation of structures visualization capabilities for viewing inside cavities endoluminal viewing of 3D surface rendered abnormalities of tubular structures eg: polyps,tumors,clots
- 15. It isintuitive and is intended to provide image visualization of the colon for masses, cancers, polyps and other lesion and allows the user to perform 3D measurements, real time volume rendering.
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- 20. No suchpost procedure care for virtual colonoscopy
- 21. VC ismore comfortable than conventional colonoscopy for some people it does not use a colonoscope. No sedation is needed, and the patient can return to his/her usual activities or go home after the procedure with of the aid of any other person. The lack of sedation also lowers the risk of the procedure since some people may have adverse reactions to sedative medications used during conventional colonoscopy. VC provides clearer, more detailed images than the conventional method
- 22. VC takesless time than the conventional colonoscopy VC provides a secondary benefit of revealing disease or abnormalities outside the colon.
- 23. The maindisadvantage ofVC is that a radiologist cannot take tissue samples(biopsy)or remove polyps duringVC , so a conventional colonoscopy must be performed if abnormalities are found. AlsoVC does not show as much detail as a conventional colonoscopy , so polyps smaller than between 2 and 10 mm in diameter may not show up on the images.
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