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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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