A 24-channel shim array for real-time shimming of the human spinal cord: Characterization and proof-of-concept experiment
Ryan Topfer 1 , Kai-Ming Lo 2 , Karl Metzemaekers 2 , Donald Jette 2 , Hoby P. Hetherington 3 , Piotr Starewicz 2 , and Julien Cohen-Adad 1,4
Institute of Biomedical Engineering, Ecole
Polytechnique de Montral, Montreal, QC, Canada,
Research Inc., Billerica, MA, United States,
of Radiology, University of Pittsburgh, Pittsburgh, PA,
Neuroimaging Unit, CRIUGM, Universit de Montral,
Montreal, QC, Canada
A novel shim system is introduced for the purpose of
real-time shimming in spinal imaging to compensate for
respiratory-related distortions of the main field. The
24 independent, rectangular planar shim coils are
embedded within the patient bed table, in close
proximity to the spine of the scanned subject.
Preliminary calibration and proof of concept phantom
experiments are described. Compared to the unshimmed
case, the standard deviation of the field inhomogeneity,
as calculated over 1.1 L volumes of interest, was
reduced by over 30 %.
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