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A 24-channel shim array for the human spinal cord: Design, evaluation, and application.
Ryan Topfer1, Piotr Starewicz2, Kai-Ming Lo2
1Institute of Biomedical Engineering, Polytechnique Montréal, Montreal, Quebec, Canada.
Magnetic Resonance in Medicine
|August 5, 2016
Summary
A new multichannel shim array significantly improves magnetic field homogeneity for spinal cord MRI. This advancement enhances imaging quality and diagnostic capabilities for spinal cord studies.
Area of Science:
- Medical Imaging
- Magnetic Resonance Imaging (MRI)
- Neuroscience
Background:
- Magnetic field inhomogeneity is a major limitation in spinal cord MRI.
- Existing shimming techniques are often inadequate for the complex spinal anatomy.
Purpose of the Study:
- To introduce and evaluate a novel multichannel shim array designed for the human spinal cord.
- To improve magnetic field homogeneity for enhanced MRI and spectroscopic studies.
Main Methods:
- A 24-channel shim array and 8-channel transceiver array were developed for close proximity to the spine.
- Shim channel performance was characterized using field mapping at 3 Tesla.
- The shim's efficacy was tested on an ex vivo human spine phantom and five healthy volunteers.
Main Results:
- Ex vivo phantom studies showed a 36.6% improvement in field homogeneity.
- In vivo studies on volunteers demonstrated an average field homogeneity improvement of 63.8% ± 15.4%.
Conclusions:
- The localized spine shim array is a promising tool for correcting magnetic field distortions in the spinal cord.
- This technology has the potential to significantly advance spinal cord MRI and spectroscopy.
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