Maysam M Jafar1, Christopher E Dean1, Malcolm J Birch1, and Marc E Miquel1
Major
hardware-related geometric distortions in MRI arise from gradient field
non-linearity and static field inhomogeneity. For an accurate mapping of
geometrical distortion in 3D, the number of control points must be sufficiently
large to provide a comprehensive mapping of the spatial variation of distortion
and the positional accuracy of these control points must be ensured. In this
study, the spatial accuracy of coordinates in 3D space is assessed across six
clinical MRI scanners at both 1.5T and 3T field strengths using a previously
reported 3D-printed grid phantom. This is a cost-effective approach to
determine the spatial accuracy of control points.
