Abstract Update

Abstract #145, Can the Non Invasive Hydro-multidetector Row CT Replace the Endoscopic Ultrasound in the Preoperative Staging of Gastric Cancer? Ba-Ssalamah A., et.al, was withdrawn after publication of the abstracts.

It has been replaced by:

Colononic distention with automated carbon dioxide manual room air insuffliation for screening CT Colonography: prospective comparison of supine and prone datasets in over 3,000 patients
Michel S.J.¹; Pickhardt P.J.^1,2; Taylor A.J.¹; Kim D.H.^1
1University of Wisconsin Medical School Radiology, Madison, WI; ²Uniformed Services University of the Health Sciences Radiology, Bethesda, MD

Objective: To evaluate the effect of colonic distention technique on the quality of supine versus prone datasets for 3D endoluminal CT colonography.
Materials and Methods: 3018 patients (mean age, 57.2 years; 1549 men. 1469 women) underwent primary screening with CT colonography over a 3-year period. Colonic distention was achieved by either automated carbon dioxide (CO₂) delivery or by manual patient-controlled room air (RA) insufflation. All studies were interpreted on the Viatronix V3D system by one of nine radiologists using a “biphasic” 2D-3D approach, with 3D emphasis for polyp detection. For each study, the interpreting radiologist prospectively determined whether the supine or prone dataset was better in overall distention quality by analyzing the interactive 3D colonic maps that are automatically generated for each case. This determination generally selects which view will be utilized for initial 3D endoluminal fly-through for polyp detection, followed by the view of lesser quality.
Results: A total of 1285 patients underwent automated CO₂ delivery and 1733 patients underwent RA insufflation. There were no significant differences between the groups with respect to age, weight, or height. When CO₂ technique was applied, the supine view was deemed superior to prone in 67.4% (866/1285) and the prone view was preferred in 32.6% (419/1,285). With RA technique, the supine view was deemed superior to prone in 43.2% (749/1,733) and the prone was preferred in 56.8% (984/1,733). The Chi-square test to evaluate differences in supine versus prone preference between the two distention techniques was highly significant (p<0.0001).
Conclusion: With automated CO₂ distention technique, the supine dataset is more often the superior view for 3D endoluminal fly-through at CT colonography, whereas the prone dataset is more often preferred with manual RA distention. These findings may have practical implications for future advances in CT colonography technique and interpretation.

The following abstract has been withdrawn:
Abstract 152: Gastrointestinal: GI Tract.
Author: S. Saleem.
Title: Transient small bowel intussusception: an incidental finding on ultrasound.