title: Measurement of small inter-scan fluctuations in voxel dimensions in magnetic resonance images using registration.
abstract: We present a method to estimate fluctuations in voxel dimensions in MR images. In the proposed method images of a standard test object are acquired serially and registered to an initial dataset. We present the results of experiments where changes in voxel dimensions between 0.1% and 2% were prescribed and measured with an accuracy of 0.02%. The method can be integrated as part of a standard MRI Quality Assurance program and may also be useful to correct for inter-scan variability introduced by fluctuations in gradient performance.
authors.affiliation: Department of Clinical Neurology, University College London, United Kingdom. l.lemieux@ion.ucl.ac.uk
authors.forename: L
authors.initials: L
authors.lastname: Lemieux
authors.forename: G J
authors.initials: GJ
authors.lastname: Barker
mesh_terms: D055592:Biophysical Phenomena; D001703:Biophysics; D001921:Brain / Q000033:anatomy & histology; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods / Q000592:standards / Q000706:statistics & numerical data; D008279:Magnetic Resonance Imaging / Q000592:standards / Q000706:statistics & numerical data*; D019047:Phantoms, Imaging; D011786:Quality Control