NDLI: An Optically Coupled System for Quantitative Monitoring of MRI-Induced RF Currents Into Long Conductors

Content Provider	IEEE Xplore Digital Library
Author	Zanchi, M.G. Venook, R. Pauly, J.M. Scott, G.C.
Copyright Year	1982
Abstract	The currents induced in long conductors such as guidewires by the radio-frequency (RF) field in magnetic resonance imaging (MRI) are responsible for potentially dangerous heating of surrounding media, such as tissue. This paper presents an optically coupled system with the potential to quantitatively measure the RF currents induced on these conductors. The system uses a self shielded toroid transducer and active circuitry to modulate a high speed light-emitting-diode transmitter. Plastic fiber guides the light to a photodiode receiver and transimpedance amplifier. System validation included a series of experiments with bare wires that compared wire tip heating by fluoroptic thermometers with the RF current sensor response. Validations were performed on a custom whole body 64 MHz birdcage test platform and on a 1.5 T MRI scanner. With this system, a variety of phenomena were demonstrated including cable trap current attenuation, lossy dielectric Q-spoiling and even transverse electromagnetic wave node patterns. This system should find applications in studies of MRI RF safety for interventional devices such as pacemaker leads, and guidewires. In particular, variations of this device could potentially act as a realtime safety monitor during MRI guided interventions.
Sponsorship	IEEE Engineering in Medicine and Biology Society IEEE Nuclear and Plasma Sciences Society IEEE Signal Processing Society IEEE Ultrasonics, Ferroelectrics, and Frequency Control Society
Page Count	10
File Size	842783
Starting Page	169
Ending Page	178
File Format	PDF
ISSN	02780062
Volume Number	29
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical coupling Monitoring Radio frequency Conductors Magnetic resonance imaging Optical receivers Optical transmitters High speed optical techniques Optical attenuators Optical sensors safety Current sensing heating interventional devices magnetic resonance imaging (MRI)
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications Radiological and Ultrasound Technology Software

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

An Optically-Coupled System for Quantitative Monitoring of MRI-Induced RF Currents into Long Conductors

Development of an Active Intravascular MR Device With an Optical Transmission System

RF heating of implanted spinal fusion stimulator during magnetic resonance imaging

MRI and implanted medical devices: basic interactions with an emphasis on heating

RF Field Visualization of RF Ablation at the Larmor Frequency

MRI safety: RF-induced heating near straight wires

Heating near implanted medical devices by the MRI RF-magnetic field

In Vivo MR-Tracking Based on Magnetic Signature Selective Excitation

Absolute Temperature Monitoring Using RF Radiometry in the MRI Scanner

An Optically Coupled System for Quantitative Monitoring of MRI-Induced RF Currents Into Long Conductors

Similar Documents

An Optically-Coupled System for Quantitative Monitoring of MRI-Induced RF Currents into Long Conductors

Development of an Active Intravascular MR Device With an Optical Transmission System

RF heating of implanted spinal fusion stimulator during magnetic resonance imaging

MRI and implanted medical devices: basic interactions with an emphasis on heating

RF Field Visualization of RF Ablation at the Larmor Frequency

MRI safety: RF-induced heating near straight wires

Heating near implanted medical devices by the MRI RF-magnetic field

In Vivo MR-Tracking Based on Magnetic Signature Selective Excitation

Absolute Temperature Monitoring Using RF Radiometry in the MRI Scanner

An Optically Coupled System for Quantitative Monitoring of MRI-Induced RF Currents Into Long Conductors