title: Distortion indicator algorithm for simple artifact assessment of passive MRI markers.
abstract: The main purpose of this work is to present a simple quantitative approach for assessing artifacts in passive instruments when used in an MRI environment. It is mainly based on a quantitative indicator related with the amount of distortion produced by the instrument on a 3D surface obtained from the 2D MR image. After a preprocessing stage for attenuation of the 3D surface low frequency components, an indicator related with the volume of the background distortion is computed for each MRI slice. Then a monotonically decreasing curve is calculated for assessing artifact level using all the slices of a sequence. Results show that an indicator can be computed automatically from all the slices of a given MRI sequence and through this indicator it is possible to perform comparative studies between artifacts produced by different catheters and needles.
authors.forename: Alfredo
authors.initials: A
authors.lastname: Illanes
authors.forename: Johannes
authors.initials: J
authors.lastname: Krug
authors.forename: Hamideh
authors.initials: H
authors.lastname: Abadi
authors.forename: Michael
authors.initials: M
authors.lastname: Friebe
mesh_terms: D000465:Algorithms; D016477:Artifacts; D057785:Catheters; D006801:Humans; D008279:Magnetic Resonance Imaging; D009339:Needles