PET/MRI in paediatric inflammatory bowel disease - a prospective accuracy study

Area of Science:

• Pediatric Gastroenterology
• Medical Imaging
• Inflammatory Bowel Disease Research

Background:

• Cross-sectional imaging is crucial for diagnosing inflammatory bowel diseases (IBD).
• Evaluating advanced imaging techniques like PET/MRI in pediatric IBD diagnostics is essential.

Purpose of the Study:

• To assess the diagnostic accuracy of combined Positron Emission Tomography/Magnetic Resonance Imaging (PET/MRI) in children suspected of having IBD.
• To compare PET/MRI performance against standalone PET and MRI, using endoscopy and histopathology as the reference standard.

Main Methods:

• A prospective study included 43 pediatric patients (8-17 years) evaluated for IBD.
• Patients underwent PET/MRI scans, followed by ileocolonoscopy.
• Results were analyzed per intestinal segment, comparing PET, MRI, and PET/MRI to the gold standard.

Main Results:

• PET/MRI demonstrated a moderate accuracy (AUROC 0.77) in detecting intestinal inflammation.
• Its sensitivity (0.83) and specificity (0.57) were comparable to PET alone.
• MRI changes at follow-up correlated with clinical response, suggesting its utility in monitoring treatment.

Conclusions:

• PET/MRI shows moderate accuracy for pediatric IBD detection but is not superior to individual modalities.
• While not outperforming PET or MRI alone, PET/MRI may offer value in select pediatric IBD cases with further technological development.
• Changes in MRI scores can potentially identify patients responding to treatment.