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Digital Subtraction Bowel Cleansing in CT Colonography

Michael E. Zalis1 and Peter F. Hahn

1 Both authors: Department of Radiology, Division of Abdominal Imaging and Intervention, White 270, Massachusetts General Hospital, 55 Fruit St., Boston, MA 02114.



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  		Fig. 1A. —41-year-old healthy male volunteer. Axial image obtained during CT colonography before digital processing shows uniform opacification of colon contents.

 


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  		Fig. 1B. —41-year-old healthy male volunteer. Axial image obtained during CT colonography after digital processing reveals removal of opacified bowel contents. Native haustral folds are left unaffected.

 


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  		Fig. 1C. —41-year-old healthy male volunteer. Magnified view of A.

 


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  		Fig. 1D. —41-year-old healthy male volunteer. Magnified view of B.

 


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  		Fig. 2A. —40-year-old male with colonoscopy-confirmed rectal mass. Axial source image obtained during CT colonography before digital processing shows uniform opacification of colon. Partially obscured mass (white arrow) and native haustral fold (black arrow) are indicated.

 


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  		Fig. 2B. —40-year-old male with colonoscopy-confirmed rectal mass. Axial source image for CT colonography obtained at same level as in A after digital processing using matrix method reveals that opacified bowel contents have been subtracted, whereas mass (white arrow) and fold (black arrow) are left unaffected.

 


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  		Fig. 2C. —40-year-old male with colonoscopy-confirmed rectal mass. Volume-rendered endoluminal view reconstruction of CT colonography obtained before digital processing shows partially obscured mass (white arrow) and haustral fold (black arrow).

 


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  		Fig. 2D. —40-year-old male with colonoscopy-confirmed rectal mass. Volume-rendered endoluminal view reconstruction of CT colonography obtained after digital subtraction using matrix method reveals that opacified colonic contents have been removed, whereas rectal mass (white arrow) and haustral fold (black arrow) remain visible.

 

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