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Feasibility of MDCT Colonography in Ultra-Low-Dose Technique in the Detection of Colorectal Lesions: Comparison with High-Resolution Video Colonoscopy

Mathias Cohnen1, Christoph Vogt2, Andreas Beck3, Kjel Andersen1, Wolfram Heinen1, Stephan vom Dahl2, Volker Aurich3, Dieter Haeussinger2 and Ulrich Moedder1

1 Institute of Diagnostic Radiology, University Hospital Duesseldorf, MNR-Klinik, Moorenstrasse 5, Duesseldorf 40225, Germany.
2 Department of Gastroenterology, Hepatology, and Infectious Diseases, University Hospital Duesseldorf, Duesseldorf, Germany.
3 Institute of Informatics, Heinrich-Heine-University, Duesseldorf, Germany.



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  		Fig. 1A. —Sagittal 2D reformation of ultra-low-close MDCT of abdomen showing descending colon to demonstrate effect of mathematic noise filter (edge-preserving nonlinear gaussian filter chains). Images show nearly complete reduction of mottle or noise (A) with persistent sharp bowel wall (B).

 


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  		Fig. 1B. —Sagittal 2D reformation of ultra-low-close MDCT of abdomen showing descending colon to demonstrate effect of mathematic noise filter (edge-preserving nonlinear gaussian filter chains). Images show nearly complete reduction of mottle or noise (A) with persistent sharp bowel wall (B).

 


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  		Fig. 2A. —52-year-old man with known cirrhosis of liver and heme-positive stools. Medium (8-mm) polyp in sigmoid colon located between two haustral folds. Although these are better separated during conventional colonscopy (A), polyp can be well appreciated on ultra-low-dose MDCT colonography (arrow, B).

 


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  		Fig. 2B. —52-year-old man with known cirrhosis of liver and heme-positive stools. Medium (8-mm) polyp in sigmoid colon located between two haustral folds. Although these are better separated during conventional colonscopy (A), polyp can be well appreciated on ultra-low-dose MDCT colonography (arrow, B).

 


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  		Fig. 3A. —75-year-old man with known diverticulosis and recurrent left lower quadrant pain. Small (3-mm) polypoid lesion in ascending colon located on haustral fold is seen on high-resolution video colonoscopy (A) and ultra-low-dose MDCT colonography (B). MDCT colonography showed multiple diverticula of sigmoid colon without sign of acute inflammation (not shown).

 


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  		Fig. 3B. —75-year-old man with known diverticulosis and recurrent left lower quadrant pain. Small (3-mm) polypoid lesion in ascending colon located on haustral fold is seen on high-resolution video colonoscopy (A) and ultra-low-dose MDCT colonography (B). MDCT colonography showed multiple diverticula of sigmoid colon without sign of acute inflammation (not shown).

 

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