Validation of a lower radiation computed tomography enterography imaging protocol to detect Crohn's disease in the small bowel
✍ Scribed by Hassan Siddiki; Joel G. Fletcher; Amy K. Hara; James M. Kofler; Cynthia H. McCollough; Jeff L. Fidler; Luis Guimaraes; James E. Huprich; William J. Sandborn; Edward V. Loftus Jr.; Jay Mandrekar; David H. Bruining
- Publisher
- John Wiley and Sons
- Year
- 2011
- Tongue
- English
- Weight
- 800 KB
- Volume
- 17
- Category
- Article
- ISSN
- 1078-0998
No coin nor oath required. For personal study only.
✦ Synopsis
Background:
The purpose was to validate a lower radiation dose computed tomography enterography (CTE) imaging protocol to detect the presence of Crohn's disease (CD) in the small bowel using two different reference standards and to identify a prediction model based on CTE signs for the presence of active CD.
Methods: This retrospective study included patients with known or suspected CD who underwent CTE between January and October 2006 according to a lower radiation dose protocol. Two gastrointestinal radiologists blindly and independently classified each CTE as being active or inactive. Reference standards included ileocolonoscopy 6 biopsy and a comprehensive clinical reference standard (retrospectively created by a gastroenterologist, also including history, physical, follow-up course, and subsequent endoscopy, imaging, or surgery). Logistic regression was used to identify CTE findings that predicted the presence of active CD based on the combined clinical reference standard.
Results: In all, 137 patients underwent CTE and ileocolonoscopy.
Using an endoscopic reference standard, the sensitivity of CTE to detect active CD for the two readers was 81% and 89%, respectively. Using the clinical reference standard, the sensitivity of CTE to detect active CD was 89% and 98%, respectively. For both readers the sensitivity of CTE increased by 8%-9% when using the comprehensive reference standard. Multivariate analysis showed that a combination of mural thickness and hyperenhancement best predicted active CD (area under the curve [AUC] ¼ 0.92-0.93, P < 0.0001).
Conclusions: Lower radiation dose CTE exams are sensitive for the detection of active small bowel CD. The combination of mural thickness and hyperenhancement are the best radiologic predictors of active CD.