Abstract #1395
3D-printed geometric distortion correction phantom for MRI
David W Holdsworth 1,2 , Matthew G Teeter 1,2 , Jaques S Milner 2 , Steven I Pollmann 2 , and Maria Drangova 2,3
1
Department of Surgery, Western University,
London, Ontario, Canada,
2
Robarts
Research Institute, London, Ontario, Canada,
3
Department
of Medical Biophysics, Western University, London,
Ontario, Canada
Accurate correction of geometric distortion is
increasingly important for MRI applications in
image-guided intervention. Advances in 3D printing have
made it possible to fabricate structures with
three-dimensional features that facilitate automated
analysis of geometric distortions. We describe the
fabrication of a plastic structure comprised of 4.5 mm
beads, supported by 1.5 mm struts at 13 mm nominal
spacing, which is immersed in a tissue-mimicking liquid.
Automated analysis produces a point cloud of fiducial
locations and a vector map of distortion. MRI imaging at
3T demonstrates the ability to determine average local
distortions of ±0.53 mm, over a 500 ml volume.
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