1. An image processing device for assessing inflammatory bowel disease based on magnetic resonance imaging (MRI), the device comprising: processing circuitry configured to receive, a plurality of dynamic MRI sequence of images of a bowel of a patient, each MRI sequence of images including peristalsis information of the bowel, receive at least one static MRI image of the bowel of the patient, wherein the static MRI image identifies at least one of areas of inflammation, stenosis, and increased mural thickness of the bowel, compensate for a displacement of the bowel caused by respiration of the patient, by performing a non-rigid registration for each dynamic MRI sequence of images, compute, for each dynamic MRI sequence of images, a peristaltic activity map by performing motion analysis on the MRI sequence of images, determine a peristaltic activity for the at least one static MRI image based on a weighted sum of two closest dynamic MRI sequences of images, the two closest dynamic MRI sequences being determined based on a similarity measure of the static MRI image and the plurality of dynamic MRI sequences of images, and combine the static MRI image and the closest dynamic MRI sequence of images by performing multi-modal registration of the static MRI image and a reference image of the closest dynamic MRI sequences of images.