title: Small-bowel dislocation during long-term MRI observation - insights in intestinal physiology.
abstract: Magnetic resonance imaging (MRI) of the abdomen is a widely established imaging modality in the diagnostic workup of patients suffering from abdominal disorders. Small-bowel motility analyses using MRI have recently been introduced to provide functional information about the intestine not provided by morphological analyses. This is of clinical importance as motility disorders correlate with inflammation. Yet motility analyses mainly rely on a series of acquisitions in coronal orientation. Temporal displacement of small-bowel loops out of the coronal slice could falsify qualitative and quantitative motility analyses. Thus, our study quantified three-dimensional (3D) dislocation of small-bowel loops during abdominal MRI examinations with the patient lying in prone position to investigate its influence on motility analyses. Our study revealed segmental small-bowel displacement during MRI examinations in prone position to predominantly occur in craniocaudal orientation and in a smaller extent in lateral and ventrodorsal orientation. However, the displacement amplitudes are rather small and might not significantly influence small-bowel motility analyses in 2D coronal plane in general.
authors.affiliation: Department of Radiology, University Hospital Zürich, Zürich, Switzerland.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Bickelhaupt
authors.affiliation: Department of Radiology, University Hospital Zürich, Zürich, Switzerland.
authors.forename: Johannes M
authors.initials: JM
authors.lastname: Froehlich
authors.affiliation: Department of Radiology, Cantonal Hospital, STGAG, Muensterlingen, Switzerland.
authors.forename: Klaus-Ulrich
authors.initials: KU
authors.lastname: Wentz
authors.affiliation: Department of Radiology, Cantonal Hospital Winterthur, Winterthur, Switzerland.
authors.forename: Constantin
authors.initials: C
authors.lastname: von Weymarn
authors.affiliation: Department of Radiology, University Hospital Zürich, Zürich, Switzerland.
authors.forename: Michael A
authors.initials: MA
authors.lastname: Patak
mesh_terms: D000328:Adult; D016477:Artifacts; D005260:Female; D005769:Gastrointestinal Motility / Q000502:physiology*; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods; D021621:Imaging, Three-Dimensional / Q000379:methods*; D007421:Intestine, Small / Q000033:anatomy & histology* / Q000502:physiology*; D008137:Longitudinal Studies; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009068:Movement; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
keywords: dislocation; long-term observations; magnetic resonance imaging; small bowel; small-bowel displacement