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Quantitative assessment of small bowel motility by nonrigid registration of dynamic MR images
Magnetic Resonance in Medicine,

Odille F et al. – The ability to quantify different grades of bowel motility was investigated by comparing direct motion measures (i.e., changes in bowel cross–sectional diameter or area) and various parametric maps, e.g., based on the Jacobian of the measured displacements with expert grading. Among these measures, the standard deviation over time of the Jacobian was the best at predicting grades from 1 (moving normally) to 4 (not moving at all) in 50 bowel regions with normal and pathologically reduced motility, yielding 93% correct classification with a 1–class tolerance.

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