Three-Dimensional Endoluminal CT Colonography (Virtual Colonoscopy): Comparison of Three Commercially Available Systems
Perry J. Pickhardt 1,2
1 Department of Radiology, National Naval Medical Center, 8901 Wisconsin Ave.,
Bethesda, MD 20889-5600, and Department of Radiology, F. Edward Hébert
School of Medicine, Uniformed Services University of the Health Sciences,
Bethesda, MD 20889.
2 Present address: Department of Radiology, University of Wisconsin Medical
School, E3/311 Clinical Science Center, 600 Highland Ave., Madison, WI
53792.
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Fig. 1A. —Three-dimensional endoluminal views of 6-mm adenomatous polyp
in ascending colon found in asymptomatic 62-year-old man undergoing screening
for colorectal cancer. Image obtained using Navigator software (Advantage
Workstation version 4.0, General Electric Medical Systems, Milwaukee, WI)
shows subtle polyp on fold.
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Fig. 1B. —Three-dimensional endoluminal views of 6-mm adenomatous polyp
in ascending colon found in asymptomatic 62-year-old man undergoing screening
for colorectal cancer. Image obtained using V3D-Colon software (version 1.2.4,
Viatronix, Stony Brook, NY) shows same polyp as A but with increased
conspicuity and depth.
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Fig. 1C. —Three-dimensional endoluminal views of 6-mm adenomatous polyp
in ascending colon found in asymptomatic 62-year-old man undergoing screening
for colorectal cancer. Image obtained using Vitrea 2 software (version 3.1,
Vital Images, Plymouth, MN) shows slight contour deformity (arrow) in
location of polyp. Even in retrospect, polypoid lesion is difficult to
discern. Image also appears out of focus.
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Fig. 1D. —Three-dimensional endoluminal views of 6-mm adenomatous polyp
in ascending colon found in asymptomatic 62-year-old man undergoing screening
for colorectal cancer. Photograph from optical colonoscopy shows same polyp on
fold as that seen in A–C and adjacent measuring
guidewire.
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Fig. 2A. —Three-dimensional endoluminal views of 8-mm adenomatous polyp
in descending colon found in asymptomatic 58-year-old man undergoing screening
for colorectal cancer. Image obtained using V3D-Colon software (version 1.2.4,
Viatronix, Stony Brook, NY) shows well-circumscribed sessile polyp between
folds.
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Fig. 2B. —Three-dimensional endoluminal views of 8-mm adenomatous polyp
in descending colon found in asymptomatic 58-year-old man undergoing screening
for colorectal cancer. Image obtained using Vitrea 2 software (version 3.1,
Vital Images, Plymouth, MN) shows same polyp as A. Image appears
"fuzzy" or out of focus.
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Fig. 2C. —Three-dimensional endoluminal views of 8-mm adenomatous polyp
in descending colon found in asymptomatic 58-year-old man undergoing screening
for colorectal cancer. Image obtained using Navigator software (Advantage
Workstation version 4.0, General Electric Medical Systems, Milwaukee, WI)
shows same polyp as in A and B. Although conspicuous, polyp
lacks complete border and its outline appears to merge with proximal fold.
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Fig. 2D. —Three-dimensional endoluminal views of 8-mm adenomatous polyp
in descending colon found in asymptomatic 58-year-old man undergoing screening
for colorectal cancer. Photograph from optical colonoscopy shows same polyp in
descending colon as seen in A–C.
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Fig. 3A. —Three-dimensional endoluminal views of 8-mm hyperplastic
polyp in sigmoid colon found in asymptomatic 52-year-old man undergoing
screening for colorectal cancer. Image obtained using Vitrea 2 software
(version 3.1, Vital Images, Plymouth, MN) shows sessile polyp.
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Fig. 3B. —Three-dimensional endoluminal views of 8-mm hyperplastic
polyp in sigmoid colon found in asymptomatic 52-year-old man undergoing
screening for colorectal cancer. Image obtained using Navigator software
(Advantage Workstation version 4.0, General Electric Medical Systems,
Milwaukee, WI) shows polyp more clearly than A, but polyp still lacks
complete border.
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Fig. 3C. —Three-dimensional endoluminal views of 8-mm hyperplastic
polyp in sigmoid colon found in asymptomatic 52-year-old man undergoing
screening for colorectal cancer. Image obtained using V3D-Colon software
(version 1.2.4, Viatronix, Stony Brook, NY) shows same polyp as in A
and B. Note complete circumscribed border.
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Fig. 3D. —Three-dimensional endoluminal views of 8-mm hyperplastic
polyp in sigmoid colon found in asymptomatic 52-year-old man undergoing
screening for colorectal cancer. Photograph from optical colonoscopy shows
same sessile polyp in sigmoid colon as seen in A–C.
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Copyright © 2003 by the American Roentgen Ray Society.
