Motility Mapping Quantification Using the Classical Optical Flow Algorithm for Small Bowel Crohn's Disease:...

Area of Science:

• Gastroenterology
• Medical Imaging
• Radiology

Background:

• Crohn's disease (CD) is a chronic inflammatory bowel disease.
• Accurate assessment of small bowel motility is crucial for CD management.
• Current imaging techniques may not fully capture dynamic bowel activity.

Purpose of the Study:

• To quantify bowel motility using cine MRI and optical flow algorithms.
• To compare MRI-derived motility with balloon-assisted enteroscopy (BAE) findings in CD patients.
• To evaluate the correlation between MRI motility quantification and endoscopic inflammatory activity.

Main Methods:

• Retrospective analysis of 29 CD patients undergoing MR enterocolonography (MREC) and BAE.
• Development of software to generate bowel motility maps from cine MRI using the Horn-Schunck optical flow method.
• Comparison of motility scores with CD endoscopic index of severity (CDEIS) and other MR indices.

Main Results:

• Motility score showed a significant negative correlation with CDEIS (r = -0.59 and -0.54, P < 0.001).
• Area under the curve (AUC) for detecting significant CDEIS (≥3) was 88.2% and 78.6% for the two observers.
• No significant difference in AUC for detecting CDEIS between motility score and sMaRIA or MREC score.

Conclusions:

• Bowel motility maps generated by optical flow on cine MRI are feasible for local quantification.
• The motility score accurately reflects endoscopic inflammatory activity in small bowel segments of CD patients.
• This technique offers an objective tool for interpreting MREC to predict inflammatory activity in CD.