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Noncathartic CT Colonography with Stool Tagging: Performance With and Without Electronic Stool Subtraction

C. Daniel Johnson1, Armando Manduca2, Joel G. Fletcher2, Robert L. MacCarty2, Michael J. Carston3, W. Scott Harmsen4 and Jay N. Mandrekar4

1 Department of Radiology, Mayo Clinic, 13400 E Shea Blve., Scottsdale, AZ 85259.
2 Department of Radiology, Mayo Clinic, Rochester, MN.
3 Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN.
4 Department of Health Sciences Research, Section of Biostatistics, Mayo Clinic, Rochester, MN.


Figure 1
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  		Fig. 1A —Colon carcinoma in hepatic flexure. In CT colonography image, unsubtracted non–cathartic-prepared colon, sessile cancer is readily visible.

 

Figure 2
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  		Fig. 1B —Colon carcinoma in hepatic flexure. Electronic stool subtraction image shows tagged stool has been removed without affecting size or appearance of cancer.

 

Figure 3
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  		Fig. 2A —6-mm adenoma in descending colon. In prone CT colonography image, tagged stool surrounds small polyp (arrow).

 

Figure 4
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  		Fig. 2B —6-mm adenoma in descending colon. Electronic stool subtraction image shows tagged stool has been removed without affecting polyp (arrow).

 

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