Abstract
Purpose
To compare bowel wall T1 relaxation estimates in young patients with newly diagnosed ileal CD to healthy control participants, characterize their change over time in response to biologic medical therapy, and evaluate their associations with clinical markers of intestinal inflammation.
Materials and methods
Patients with newly diagnosed ileal CD and healthy control participants were prospectively recruited between December 2018 and October 2021. Patients underwent research MRI examinations of the bowel at baseline and at 6-weeks and 6-months into biologic medical treatment; control participants underwent single MRI examinations. MRI examinations included native T1 relaxometry of the terminal ileum using a modified Look-Locker inversion recovery (MOLLI) sequence. T1 estimates were measured on scanner-generated parametric maps. Clinical markers of intestinal inflammation were recorded at each visit. Group differences were assessed using the Mann–Whitney U test; the Friedman test was used to assess longitudinal changes in T1 estimates. Spearman correlation was used to evaluate associations between T1 estimates and inflammatory markers.
Results
Nineteen participants with CD (12 males; median age 14 years) and 15 control participants (7 males; median age 17 years) were included in the study. Bowel wall T1 estimates in CD patients (median 1302 ms) were significantly longer compared to control participants (median 1159 ms) (p < 0.001). In CD patients, T1 estimates changed over time after treatment (p = 0.001), with largest reductions between baseline and 6-weeks (p < 0.001). T1 estimates correlated with inflammatory markers, including erythrocyte sedimentation rate (ρ = 0.35; p = 0.01), c-reactive protein level (ρ = 0.34; p = 0.02), and weighted Pediatric Crohn’s Disease Activity Index (ρ = 0.39; p = 0.005). T1 estimates did not correlate with serum albumin (ρ = − 0.28; p = 0.051) and fecal calprotectin (ρ = 0.07; p = 0.63).
Conclusion
Bowel wall T1 estimates are abnormally increased in newly diagnosed ileal CD patients and decrease in response to medical therapy.
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Abbreviations
- CD:
-
Crohn’s disease
- CRP:
-
C-reactive protein
- ESR:
-
Erythrocyte sedimentation rate
- MOLLI:
-
Modified Look-Locker inversion recovery
- TNF:
-
Tumor necrosis factor
- wPCDAI:
-
Weighted Pediatric Crohn’s Disease Activity Index
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Funding was supported by National Institutes of Health (Grant No. R21DK114657).
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Mahalingam, N., Tkach, J.A., Denson, L.A. et al. Bowel wall MRI T1 relaxation estimates for assessment of intestinal inflammation in pediatric Crohn’s disease. Abdom Radiol 47, 2730–2738 (2022). https://doi.org/10.1007/s00261-022-03560-y
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DOI: https://doi.org/10.1007/s00261-022-03560-y