Published online before print October 30, 2003, 10.1148/radiol.2293021404
(Radiology 2003;229:791.)
A more recent version of this article appeared on December 1, 2003
CT Colonography Data Interpretation: Effect of Different Section Thicknesses—Preliminary Observations1
Yvonne W. Lui, MD,
Michael Macari, MD,
Gary Israel, MD,
Edmund J. Bini, MD,
Hao Wang, MS and
James Babb, PhD
1 From the Department of Radiology, Division of Abdominal Imaging, NYU Medical Center, 560 First Ave, Suite HW 207, New York, NY 10016 (Y.W.L., M.M., G.I., J.B.); Department of Medicine, Division of Gastroenterology, NYU Medical Center, VA Medical Center, New York, NY (E.J.B.); and Department of Biostatistics, Fox Chase Cancer Center, Philadelphia, Pa (H.W.). Received October 24, 2002; revision requested January 9, 2003; revision received February 11; accepted March 13. Address correspondence to M.M. (e-mail: michael.macari@med.nyu.edu).
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Figure 1a. Patient 4. Images in a 56-year-old man with 4-mm polyp seen only with thin-section CT. (a) Transverse thin-section CT image obtained in the supine position shows 4-mm lesion (arrow) in the descending colon. (b) Three-dimensional endoluminal image of the same lesion confirms polypoid lesion (arrow). (c) Transverse CT image obtained in the supine position at the same level with 5-mm-thick sections shows that the lesion (arrow) is difficult to identify secondary to volume averaging. This was not identified by either reader. (d) Three-dimensional image of this area (arrow) shows poor resolution due to thick-section technique.
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Figure 1b. Patient 4. Images in a 56-year-old man with 4-mm polyp seen only with thin-section CT. (a) Transverse thin-section CT image obtained in the supine position shows 4-mm lesion (arrow) in the descending colon. (b) Three-dimensional endoluminal image of the same lesion confirms polypoid lesion (arrow). (c) Transverse CT image obtained in the supine position at the same level with 5-mm-thick sections shows that the lesion (arrow) is difficult to identify secondary to volume averaging. This was not identified by either reader. (d) Three-dimensional image of this area (arrow) shows poor resolution due to thick-section technique.
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Figure 1c. Patient 4. Images in a 56-year-old man with 4-mm polyp seen only with thin-section CT. (a) Transverse thin-section CT image obtained in the supine position shows 4-mm lesion (arrow) in the descending colon. (b) Three-dimensional endoluminal image of the same lesion confirms polypoid lesion (arrow). (c) Transverse CT image obtained in the supine position at the same level with 5-mm-thick sections shows that the lesion (arrow) is difficult to identify secondary to volume averaging. This was not identified by either reader. (d) Three-dimensional image of this area (arrow) shows poor resolution due to thick-section technique.
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Figure 1d. Patient 4. Images in a 56-year-old man with 4-mm polyp seen only with thin-section CT. (a) Transverse thin-section CT image obtained in the supine position shows 4-mm lesion (arrow) in the descending colon. (b) Three-dimensional endoluminal image of the same lesion confirms polypoid lesion (arrow). (c) Transverse CT image obtained in the supine position at the same level with 5-mm-thick sections shows that the lesion (arrow) is difficult to identify secondary to volume averaging. This was not identified by either reader. (d) Three-dimensional image of this area (arrow) shows poor resolution due to thick-section technique.
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Figure 2a. Patient 12. Images in a 62-year-old man with 6-mm filling defect in the sigmoid colon. (a) Transverse CT image obtained in the prone position with 5-mm-thick sections shows homogeneously attenuating adherent lesion (arrow) adjacent to the sigmoid colon wall. Both readers considered this a polyp. (b) Transverse thin-section CT image obtained in the prone position at the same location shows small gas bubble (arrow) in the lesion, which confirms residual fecal material. Neither reader considered this a polyp. At colonoscopy, no polyp was seen in the sigmoid in this patient.
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Figure 2b. Patient 12. Images in a 62-year-old man with 6-mm filling defect in the sigmoid colon. (a) Transverse CT image obtained in the prone position with 5-mm-thick sections shows homogeneously attenuating adherent lesion (arrow) adjacent to the sigmoid colon wall. Both readers considered this a polyp. (b) Transverse thin-section CT image obtained in the prone position at the same location shows small gas bubble (arrow) in the lesion, which confirms residual fecal material. Neither reader considered this a polyp. At colonoscopy, no polyp was seen in the sigmoid in this patient.
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Figure 3a. Patient 3. Images in a 54-year-old man with filling defect in the transverse colon. (a) Transverse CT image obtained in the prone position with 5-mm-thick sections shows 20-mm lesion (arrow) on a dependent surface of the transverse colon. (b) Coronal CT image from the same data set shows abnormality (arrow). This was interpreted by reader 2 to be a polyp. (c) Transverse thin-section CT image obtained in the prone position at the same level shows small gas bubble within the lesion (arrow), which confirms residual fecal material. Neither reader considered this a polyp on thin-section images. (d) Coronal image from the same data set shows improved z-axis resolution when compared with b. Note lesion (arrow).
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Figure 3b. Patient 3. Images in a 54-year-old man with filling defect in the transverse colon. (a) Transverse CT image obtained in the prone position with 5-mm-thick sections shows 20-mm lesion (arrow) on a dependent surface of the transverse colon. (b) Coronal CT image from the same data set shows abnormality (arrow). This was interpreted by reader 2 to be a polyp. (c) Transverse thin-section CT image obtained in the prone position at the same level shows small gas bubble within the lesion (arrow), which confirms residual fecal material. Neither reader considered this a polyp on thin-section images. (d) Coronal image from the same data set shows improved z-axis resolution when compared with b. Note lesion (arrow).
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Figure 3c. Patient 3. Images in a 54-year-old man with filling defect in the transverse colon. (a) Transverse CT image obtained in the prone position with 5-mm-thick sections shows 20-mm lesion (arrow) on a dependent surface of the transverse colon. (b) Coronal CT image from the same data set shows abnormality (arrow). This was interpreted by reader 2 to be a polyp. (c) Transverse thin-section CT image obtained in the prone position at the same level shows small gas bubble within the lesion (arrow), which confirms residual fecal material. Neither reader considered this a polyp on thin-section images. (d) Coronal image from the same data set shows improved z-axis resolution when compared with b. Note lesion (arrow).
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Figure 3d. Patient 3. Images in a 54-year-old man with filling defect in the transverse colon. (a) Transverse CT image obtained in the prone position with 5-mm-thick sections shows 20-mm lesion (arrow) on a dependent surface of the transverse colon. (b) Coronal CT image from the same data set shows abnormality (arrow). This was interpreted by reader 2 to be a polyp. (c) Transverse thin-section CT image obtained in the prone position at the same level shows small gas bubble within the lesion (arrow), which confirms residual fecal material. Neither reader considered this a polyp on thin-section images. (d) Coronal image from the same data set shows improved z-axis resolution when compared with b. Note lesion (arrow).
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Copyright © 2003 by the Radiological Society of North America.
