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Published online October 3, 2003, 10.1148/rg.e18
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CT and MR Colonography: Scanning Techniques, Postprocessing, and Emphasis on Polyp Detection1

Remy W. F. Geenen, MD, Shahid M. Hussain, MD, PhD, Filippo Cademartiri, MD, Jan-Werner Poley, MD, Peter D. Siersema, MD, PhD and Gabriel P. Krestin, MD, PhD

1 From the Departments of Radiology (R.W.F.G., S.M.H., F.C, G.P.K.) and Gastroenterology and Hepatology (J.W.P., P.D.S.), Erasmus Medical Center, Dr Molenwaterplein 40, 3015 GD Rotterdam, The Netherlands, and the Department of Radiology, University Hospital Parma, Parma, Italy (F.C.). Presented as an educational exhibit at the 2002 RSNA scientific assembly. Received April 29, 2003, revision requested July 11, revision received and accepted August 13. Address correspondence to R.W.F.G. (e-mail: r.geenen@erasmusmc.nl).



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  		Figure 1.  The adenoma-to-carcinoma sequence.

 


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  		Figure 2.  Segmental collapse of the colon. (Left) Axial source CT scan and (right) tissue transition projection.

 


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  		Figure 3.  MR colonography. A, Bright lumen technique: 3D GRE sequence with water-gadolinium enema. B, Virtual colonoscopy of normal ascending colon. C, D, Combined bright and black lumen technique: C, contrast-enhanced 3D spoiled T1-weighted GRE image and, D, nonenhanced 3D spoiled and balanced GRE image.

 


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  		Figure 4.  MR colonography. (A) Axial (B) coronal, and (C) saggital MPRs show polyp near splenic flexure.

 


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  		Figure 5.  Virtual colonoscopy. (A) Retrograde and (B) antegrade views of polyp.

 


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  		Figure 6.  Virtual colonoscopic view of polypoid lesion.

 


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  		Figure 7.  Tissue transition projection of inflammatory stenosis.

 


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  		Figure 8.  Shaded surface display of inflammatory stenosis.

 




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