title: Assessment of nonrespiratory stomach motion in healthy volunteers in fasting and postprandial states.
abstract: OBJECTIVE
  To characterize nonrespiratory stomach motion in the fasting state and postprandial.
  
  
  METHODS
  Ten healthy volunteers underwent 2-dimensional Fiesta cine magnetic resonance imaging studies in 30-second voluntary breath hold, in axial, coronal, and 2 oblique planes while fasting, and 5, 15, 30, 45, and 60 minutes postmeal. Each stomach contour was delineated and sampled with 200 points. Matching points were found for all contours in the same 30-second acquisition. Using deformable parametric analysis (Matlab, version 7.1), mean magnitude, and standard deviation of displacement of each point were determined for each patient. Maximal, minimal, and median population values in 6 cardinal, and in any direction, were calculated.
  
  
  RESULTS
  The median of mean displacements for the baseline position of each point was small and rarely exceeded 1.1 mm; greatest value was 1.6 mm superior-inferior. Median displacement (pooled across time) in the right-left, superior-inferior, and anterior-posterior directions was 0.3 (range, -0.7 to 1.3), 0.8 (-0.4 to 2.4), and 0.3 (-1.1 to 1.6) mm, respectively. Fasting and postprandial standard deviation did not differ.
  
  
  CONCLUSIONS
  Nonrespiratory stomach displacement is small and stomach position is stable after a small, standard meal. Radiation therapy may be delivered at any time within the first hour after eating without significant compromise of planned planning target volumes.
authors.affiliation: Department of Radiation Oncology, Princess Margaret Cancer Centre, University of Toronto, Toronto, Ontario, Canada.
authors.forename: Barbara
authors.initials: B
authors.lastname: Wysocka
authors.affiliation: Department of Radiation Physics, Princess Margaret Cancer Centre, University of Toronto, Toronto, Ontario, Canada.
authors.forename: Joanne
authors.initials: J
authors.lastname: Moseley
authors.affiliation: Department of Radiation Physics, Princess Margaret Cancer Centre, University of Toronto, Toronto, Ontario, Canada.
authors.forename: Kristy
authors.initials: K
authors.lastname: Brock
authors.affiliation: Department of Biostatistics, University Health Network, Princess Margaret Cancer Centre, Toronto, Ontario, Canada.
authors.forename: Gina
authors.initials: G
authors.lastname: Lockwood
authors.affiliation: Department of Radiation Physics, Princess Margaret Cancer Centre, University of Toronto, Toronto, Ontario, Canada.
authors.forename: Graham
authors.initials: G
authors.lastname: Wilson
authors.affiliation: Department of Radiation Physics, Princess Margaret Cancer Centre, University of Toronto, Toronto, Ontario, Canada.
authors.forename: Anna
authors.initials: A
authors.lastname: Simeonov
authors.affiliation: Department of Medical Imaging, Princess Margaret Cancer Centre, University of Toronto, Toronto, Ontario, Canada.
authors.forename: Masoom A
authors.initials: MA
authors.lastname: Haider
authors.affiliation: Department of Radiation Oncology, Princess Margaret Cancer Centre, University of Toronto, Toronto, Ontario, Canada.
authors.forename: Cynthia
authors.initials: C
authors.lastname: Menard
authors.affiliation: Department of Radiation Physics, Princess Margaret Cancer Centre, University of Toronto, Toronto, Ontario, Canada.
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Bissonnette
authors.affiliation: Department of Radiation Oncology, Princess Margaret Cancer Centre, University of Toronto, Toronto, Ontario, Canada.
authors.forename: Laura A
authors.initials: LA
authors.lastname: Dawson
authors.affiliation: Department of Radiation Oncology, Princess Margaret Cancer Centre, University of Toronto, Toronto, Ontario, Canada. Electronic address: jolie.ringash@rmp.uhn.on.ca.
authors.forename: Jolie
authors.initials: J
authors.lastname: Ringash
mesh_terms: D000328:Adult; D004435:Eating / Q000502:physiology; D005215:Fasting / Q000502:physiology*; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D019028:Magnetic Resonance Imaging, Cine; D008297:Male; D008875:Middle Aged; D019518:Postprandial Period / Q000502:physiology*; D011859:Radiography; D011880:Radiotherapy Planning, Computer-Assisted; D013270:Stomach / Q000000981:diagnostic imaging* / Q000502:physiology*; D055815:Young Adult