Magnetic resonance imaging assisted by wireless passive implantable fiducial e-markers
Date
2017Source Title
IEEE Access
Electronic ISSN
2169-3536
Publisher
Institute of Electrical and Electronics Engineers
Volume
5
Pages
19693 - 19702
Language
English
Type
ArticleItem Usage Stats
255
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views
177
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Abstract
This paper reports a wireless passive resonator architecture that is used as a fiducial electronic marker (e-marker) intended for internal marking purposes in magnetic resonance imaging (MRI). As a proof-of-concept demonstration, a class of double-layer, sub-cm helical resonators were microfabricated and tuned to the operating frequency of 123 MHz for a three T MRI system. Effects of various geometrical parameters on the resonance frequency of the e-marker were studied, and the resulting specific absorption rate (SAR) increase was analyzed using a full-wave microwave solver. The B1 + field distribution was calculated, and experimental results were compared. As an exemplary application to locate subdural electrodes, these markers were paired with subdural electrodes. It was shown that such sub-cm self-resonant e-markers with biocompatible constituents can be designed and used for implant marking, with sub-mm positioning accuracy, in MRI. In this application, a free-space quality factor ( Q -factor) of approximately 50 was achieved for the proposed resonator architecture. However, this structure caused an SAR increase in certain cases, which limits its usage for in vivo imaging practices. The findings indicate that these implantable resonators hold great promise for wireless fiducial e-marking in MRI as an alternative to multimodal imaging.
Keywords
Fiducial e-markersImplants
Magnetic resonance imaging
Wireless resonators
Biocompatibility
Dental prostheses
Electrodes
Geometrical optics
Geometry
Magnetism
Q factor measurement
Radar imaging
Resonance
Resonators
Fiducial e-markers
Field distribution
Implantable resonators
Multi-modal imaging
Operating frequency
Positioning accuracy
Resonance frequencies
Specific absorption rate
Magnetic resonance imaging
Permalink
http://hdl.handle.net/11693/37122Published Version (Please cite this version)
https://doi.org/10.1109/ACCESS.2017.2752649Collections
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