and cycle of bowel contractions.Luminal diameter, contraction cycle and contraction ratio were compared between healthy volunteers and CIPOpatients, andwere statistically analyzed. [Results] Cine-MRI provided high temporal, spatial, and contrast resolution for monitoring entire small bowel contractions. Mean values with standard deviations of luminal diameter were significantly larger in CIPO patients than in healthy volunteers (44.1 ± 17.1 mm and 10.1 ± 4.3 mm respectively, p<0.001), and those of contraction ratio were significantly lower in CIPO patients than in healthy volunteers (18.7 ± 20.9 % and 78.3 ± 12.6 % respectively, p<0.001). On the other hand, no significant differences were observed between these two groups in contraction cycle (7.5 ± 2.6 s and 7.2 ± 1.3 s respectively, p=0.67). Cine-MRI could easily detect not only distended loops, but also akinetic and severely hypokinetic loops because of its high temporal, spatial, and contrast resolution. [Conclusions] Cine-MRI is an easier, less invasive procedure compared to conventional methods including manometry, and provides sufficient dynamic images to assess entire small bowel motility. Abnormalities of small bowel movement can be detected more clearly because of its cinemode display. Measurement of bowel caliber allows calculation of contraction cycle and contraction ratio, and enables quantitative assessment of small bowel motility function. CineMRI is an useful and novel modality for diagnosis of CIPO.