Abstract
Purpose
We compared contrast-enhanced MR enterography with diffusion-weighted sequences to
evaluate the validity of diffusion-weighted sequences for activity assessment in Crohnʼs
disease compared to endoscopy. In addition, we investigated a new color-coded image
post-processing technique in comparison with standard sequences and endoscopy.
Materials and Methods
Included were 197 MR enterographies (2015–2017) performed by using standardized examination
protocols. The intestine was divided into 7 segments, which were compared separately.
The accuracy of the MR examinations with regard to disease activity was validated
using the Seo and MaRIA score and endoscopy findings. In addition, the image data
were post-processed using a color-coded evaluation method (DCE tool on OsiriX).
Results
The comparison between contrast-enhanced and diffusion-weighted sequences showed a
highly significant correlation for all bowel sections with a mean Spearman correlation
coefficient of 0.876 (0.809–0.928). The color-coded image post-processing showed a
sensitivity of 83.2 % and a specificity of 70.5 % in comparison with the MaRIA score.
In comparison to endoscopy, a sensitivity of 81.3 % and a specificity of 70.5 %. In
comparison with endoscopy, the MaRIA score showed a sensitivity of 80.2 % and a specificity
of 84.0 % at a cut-off of 7. The visual score according to Seo showed a sensitivity
of 85.7 % with a specificity of 77.0 % in the contrast-weighted examination and a
sensitivity of 87.9 % and a specificity of 71.8 % for diffusion weighted images.
Conclusion
Diffusion-weighted sequences are as good as contrast-weighted sequences for assessing
inflammatory activity in Crohnʼs disease. Contrast is often helpful for assessing
complications, but this was not the purpose of this study. Visual imaging using color-coded
data sets was similarly good at detecting inflammation.
Key points:
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MR enterography is possible without contrast using diffusion-weighted imaging with
comparable high informative value.
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Inflammatory activity in MR correlates sufficiently well with endoscopy
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The MaRIA and Seo scores are comparable in their validity.
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The colored representation of inflamed bowel sections is a promising technique.
Citation Format
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Jakob M, Backes M, Schaefer C et al. MR Enterography in Crohnʼs Disease: Comparison
of Contrast Imaging with Diffusion-weighted Imaging and a special Form of Color Coding.
Fortschr Röntgenstr 2022; 194: 1119 – 1131
Key words
MR enterography - MR-diffusion/perfusion - inflammation bowel - color coding - MaRia
Score
