Technical Note: Extended field-of-view (FOV) MRI distortion determination through multi-positional phantom imaging.

Technical Note: Extended field-of-view (FOV) MRI distortion determination through multi-positional phantom imaging.
J Appl Clin Med Phys. 2020 Oct 19;:
Authors: Schüler E, Mallozzi R, Levy J, Hristov D
Abstract
Comprehensive characterization of geometric distortions for MRI simulators and MRI-guided treatment delivery systems is typically performed with large phantoms that are costly and unwieldy to handle. Here we propose an easily implementable methodology for MR distortion determination of the entire imaging space of the scanner through the use of a compact commercially available distortion phantom. The MagphanRT phantom was scanned at several locations within a MR scanner. From each scan, an approximate location of the phantom was determined from a subset of the fiducial spheres. The fiducial displacements were determined, and a displacement field was fitted to the displacement data using the entire multi-scan data set. An orthogonal polynomial expansion fitting function was used that had been augmented to include independent rigid-body transformations for each scan. The rigid-body portions of the displacement field were thereafter discarded, and the resultant fit then represented the distortion field. Multi-positional scans of the phantom were used successfully to determine the distortion field with extended coverage. A single scan of the phantom covered 20 cm in its smallest dimension. By stitching together overlapping scans ...

Source: Journal of Applied Clinical Medical Physics - October 19, 2020 Category: Physics Authors: Schüler E, Mallozzi R, Levy J, Hristov D Tags: J Appl Clin Med Phys Source Type: research