Magneto-inductive magnetic resonance imaging duodenoscope
File(s)
Accepted version
Author(s)
Type
Journal Article
Abstract
A magnetic resonance imaging (MRI) duodenoscope is demonstrated, by combining non-
magnetic endoscope components with a thin-film receiver based on a magneto-inductive waveguide.
The waveguide elements consist of figure-of-eight shaped inductors formed on either side of a flexible
substrate and parallel plate capacitors that use the substrate as a dielectric. Operation is simulated
using equivalent circuit models and by computation of two- and three-dimensional sensitivity patterns.
Circuits are fabricated for operation at 127.7 MHz by double-sided patterning of copper-clad Kapton
and assembled onto non-magnetic flexible endoscope insertion tubes. Operation is verified by bench
testing and by
1
H MRI at 3T using phantoms. The receiver can form a segmented coaxial image along
the length of the endoscope, even when bent, and shows a signal-to-noise-ratio advantage over a surface
array coil up to three times the tube diameter at the tip. Initial immersion imaging experiments have
been carried out and confirm an encouraging lack of sensitivity to RF heating.
magnetic endoscope components with a thin-film receiver based on a magneto-inductive waveguide.
The waveguide elements consist of figure-of-eight shaped inductors formed on either side of a flexible
substrate and parallel plate capacitors that use the substrate as a dielectric. Operation is simulated
using equivalent circuit models and by computation of two- and three-dimensional sensitivity patterns.
Circuits are fabricated for operation at 127.7 MHz by double-sided patterning of copper-clad Kapton
and assembled onto non-magnetic flexible endoscope insertion tubes. Operation is verified by bench
testing and by
1
H MRI at 3T using phantoms. The receiver can form a segmented coaxial image along
the length of the endoscope, even when bent, and shows a signal-to-noise-ratio advantage over a surface
array coil up to three times the tube diameter at the tip. Initial immersion imaging experiments have
been carried out and confirm an encouraging lack of sensitivity to RF heating.
Date Issued
2017-09-14
Date Acceptance
2017-08-01
Citation
Progress in Electromagnetics Research (PIER), 2017, 159, pp.125-138
ISSN
1070-4698
Publisher
EMW Publishing
Start Page
125
End Page
138
Journal / Book Title
Progress in Electromagnetics Research (PIER)
Volume
159
Copyright Statement
© Copyright 2017 EMW Publishing. All Rights Reserved
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Medical Research Council (MRC)
The Royal Society
Engineering & Physical Science Research Council (EPSRC)
The Royal Society
AMMF
Imperial College Healthcare Charity
Engineering & Physical Science Research Council (E
AMMF
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000411498900009&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Grant Number
GR/S08077/01
G9900178
N/A
EP/D032687/1
2005/R1
N/A
5101
EP/P510798/1
2017/112
Subjects
Science & Technology
Technology
Physical Sciences
Engineering, Electrical & Electronic
Physics, Applied
Telecommunications
Engineering
Physics
RECEIVER COIL
MRI
CATHETERS
GUIDE
WIRES
Publication Status
Published