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J. Imaging 2017, 3(3), 28;

Assessment of Geometric Distortion in Six Clinical Scanners Using a 3D-Printed Grid Phantom

Clinical Physics, Barts Health NHS Trust, London EC1A 7BE, UK
Author to whom correspondence should be addressed.
Received: 26 May 2017 / Revised: 27 June 2017 / Accepted: 15 July 2017 / Published: 18 July 2017
(This article belongs to the Special Issue Magnetic Resonance Imaging)
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A cost-effective regularly structured three-dimensional (3D) printed grid phantom was developed to enable the quantification of machine-related magnetic resonance (MR) distortion. This phantom contains reference features, “point-like” objects, or vertices, which resulted from the intersection of mesh edges in 3D space. 3D distortions maps were computed by comparing the locations of corresponding features in both MR and computer tomography (CT) data sets using normalized cross correlation. Results are reported for six MRI scanners at both 1.5 T and 3.0 T field strengths within our institution. Mean Euclidean distance error for all MR volumes in this study, was less than 2 mm. The maximum detected error for the six scanners ranged from 2.4 mm to 6.9 mm. The conclusions in this study agree well with previous studies that indicated that MRI is quite accurate near the centre of the field but is more spatially inaccurate toward the edges of the magnetic field. View Full-Text
Keywords: quality analysis; MRI; distortion; 3D printing quality analysis; MRI; distortion; 3D printing

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Jafar, M.; Jafar, Y.M.; Dean, C.; Miquel, M.E. Assessment of Geometric Distortion in Six Clinical Scanners Using a 3D-Printed Grid Phantom. J. Imaging 2017, 3, 28.

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