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Polyp Measurement Using CT Colonography: Agreement with Colonoscopy and Effect of Viewing Conditions on Interobserver and Intraobserver Agreement

David Burling1, Steve Halligan1,2, Stuart Taylor1,2, Duncan J. Brennand1, Douglas G. Altman3, Paul Bassett4, Wendy Atkin1 and Clive I. Bartram1

1 Intestinal Imaging Centre, St. Mark's Hospital, Harrow, Middlesex, England HA1 3UJ.
3 Medical Statistics Group, Centre for Statistics in Medicine, Institute of Health Sciences, Oxford, England.
4 Consultant, Ruislip, Middlesex, England.


Figure 1
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  		Fig. 1A —65-year-old man with sigmoid polyp who underwent CT colonography on 4-MDCT scanner with collimation of 1.25 mm, pitch of 1.5, and 100 mA. NAVG = navigator. Two-dimensional colonography window view, show 6-mm sigmoid polyp.

 

Figure 2
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  		Fig. 1B —65-year-old man with sigmoid polyp who underwent CT colonography on 4-MDCT scanner with collimation of 1.25 mm, pitch of 1.5, and 100 mA. NAVG = navigator. 2D abdominal window view, show 6-mm sigmoid polyp.

 

Figure 3
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  		Fig. 1C —65-year-old man with sigmoid polyp who underwent CT colonography on 4-MDCT scanner with collimation of 1.25 mm, pitch of 1.5, and 100 mA. NAVG = navigator. 3D surface-rendered view show 6-mm sigmoid polyp.

 

Figure 4
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  		Fig. 2A —Bland-Altman dot plots showing agreement between CT measurements and colonoscopy reference for each observer grouped according to visualization display (A) and per observer 1 to 4 (B). Effect of visualization display on polyp diameter measurement.

 

Figure 5
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  		Fig. 2B —Bland-Altman dot plots showing agreement between CT measurements and colonoscopy reference for each observer grouped according to visualization display (A) and per observer 1 to 4 (B). Interobserver agreement. Colon = colonography, abdo = abdominal.

 

Figure 6
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  		Fig. 3A —Bland-Altman dot plots showing intraobserver agreements, grouped according to visualization display (A) and per observer 1 to 4 (B). Effect of visualization display on intraobserver agreement.

 

Figure 7
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  		Fig. 3B —Bland-Altman dot plots showing intraobserver agreements, grouped according to visualization display (A) and per observer 1 to 4 (B). Intraobserver agreement. Colon = colonography, abdo = abdominal.

 

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