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Spatial Distortion Due to Field Inhomogeneity in 3.0 Tesla Intraoperative MRI

Authors :
Eric M. Chin
Paul Klimo
Asim F. Choudhri
Frederick A. Boop
Source :
The Neuroradiology Journal. 27:387-392
Publication Year :
2014
Publisher :
SAGE Publications, 2014.

Abstract

We describe a 14-year-old boy with a pilocytic astrocytoma of the left caudate head. Preoperative localization MR imaging (MRI) was performed in the operating room, and spatial distortion was noted felt to be related to head positioning relative to the isocenter of the magnetic field. The distortion artifact was subtle enough to be difficult to detect, but large enough to change the location of the lesion potentially leading to a non-diagnostic stereotactic biopsy. Repeat imaging after changing the head position to allow scanning closer to the isocenter of the magnetic field showed decreased distortion, an improvement greater than that using the manufacturer's distortion correction algorithm on the initial images. Intraoperative MRI, and its requisite limitations in positioning, requires vigilance to detect possible distortion that could alter surgical outcomes if not identified and corrected prospectively.

Details

ISSN :
23851996 and 19714009
Volume :
27
Database :
OpenAIRE
Journal :
The Neuroradiology Journal
Accession number :
edsair.doi.dedup.....783e7f246294806066eecf632fb07d4b
Full Text :
https://doi.org/10.15274/nrj-2014-10081