1. An image processing device for assessing inflammatory bowel disease based on MRI images, the device comprising: circuitry configured to receive, a first sequence of MRI images of a bowel of a patient, each MRI image included in the first sequence of MRI 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 provides anatomical and structural information that identifies 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 registration, based on a reference image, for each image of the first sequence of MRI images, the reference image corresponding to a central midpoint of a breathing cycle of the patient, compute, for each image of the first sequence of MRI images, a corresponding peristaltic activity map by performing motion analysis on the first sequence of MRI images, compute a peristaltic activity map for the at least one static MRI image based on a weighted sum of two closest MRI sets of images of the first sequence of MRI images, the two closest MRI sets being determined based on a similarity measure of the at least one static MRI image and the first sequence of MRI images, and assess inflammation of the bowel by generating a new fused image by combining the at least one static MRI image and the computed peristaltic activity map for the at least one static MRI image interpolated, based on the weighted sum, from the two closest MRI sets of images from the first sequence of MRI images.