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A resistive heating system for homeothermic maintenance in small animals

PURPOSE: To develop an MR-compatible resistive heater for temperature maintenance of anaesthetized animals. MATERIALS AND METHODS: An MR-compatible resistive electrical heater was formed from a tightly-wound twisted pair wire, interfaced to a homeothermic maintenance controller. Fat-suppressed image...

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Autores principales: Kersemans, Veerle, Gilchrist, Stuart, Allen, Philip D., Beech, John S., Kinchesh, Paul, Vojnovic, Borivoj, Smart, Sean C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4462590/
https://www.ncbi.nlm.nih.gov/pubmed/25863135
http://dx.doi.org/10.1016/j.mri.2015.03.011
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author Kersemans, Veerle
Gilchrist, Stuart
Allen, Philip D.
Beech, John S.
Kinchesh, Paul
Vojnovic, Borivoj
Smart, Sean C.
author_facet Kersemans, Veerle
Gilchrist, Stuart
Allen, Philip D.
Beech, John S.
Kinchesh, Paul
Vojnovic, Borivoj
Smart, Sean C.
author_sort Kersemans, Veerle
collection PubMed
description PURPOSE: To develop an MR-compatible resistive heater for temperature maintenance of anaesthetized animals. MATERIALS AND METHODS: An MR-compatible resistive electrical heater was formed from a tightly-wound twisted pair wire, interfaced to a homeothermic maintenance controller. Fat-suppressed images and localized spectra were acquired with the twisted pair heater and a near-identical single strand heater during operation at maximum power. Data were also acquired in the absence of heating to demonstrate the insensitivity of MR to distortions arising from the passage of current through the heater elements. The efficacy of temperature maintenance was examined by measuring rectal temperature immediately following induction of general anesthesia and throughout and after the acquisition of a heater artifact-prone image series. RESULTS: Images and spectra acquired in the presence and absence of DC current through the twisted pair heater were identical whereas the passage of current through the single strand wire created field shifts and lineshape distortions. Temperature that is lost during anesthesia induction was recovered within approximately 10–20 minutes of induction, and a stable temperature is reached as the animal's temperature approaches the set target. CONCLUSION: The twisted pair wire heater does not interfere with MR image quality and maintains adequate thermal input to the animal to maintain body temperature.
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spelling pubmed-44625902015-07-01 A resistive heating system for homeothermic maintenance in small animals Kersemans, Veerle Gilchrist, Stuart Allen, Philip D. Beech, John S. Kinchesh, Paul Vojnovic, Borivoj Smart, Sean C. Magn Reson Imaging Technical Note PURPOSE: To develop an MR-compatible resistive heater for temperature maintenance of anaesthetized animals. MATERIALS AND METHODS: An MR-compatible resistive electrical heater was formed from a tightly-wound twisted pair wire, interfaced to a homeothermic maintenance controller. Fat-suppressed images and localized spectra were acquired with the twisted pair heater and a near-identical single strand heater during operation at maximum power. Data were also acquired in the absence of heating to demonstrate the insensitivity of MR to distortions arising from the passage of current through the heater elements. The efficacy of temperature maintenance was examined by measuring rectal temperature immediately following induction of general anesthesia and throughout and after the acquisition of a heater artifact-prone image series. RESULTS: Images and spectra acquired in the presence and absence of DC current through the twisted pair heater were identical whereas the passage of current through the single strand wire created field shifts and lineshape distortions. Temperature that is lost during anesthesia induction was recovered within approximately 10–20 minutes of induction, and a stable temperature is reached as the animal's temperature approaches the set target. CONCLUSION: The twisted pair wire heater does not interfere with MR image quality and maintains adequate thermal input to the animal to maintain body temperature. Elsevier 2015-07 /pmc/articles/PMC4462590/ /pubmed/25863135 http://dx.doi.org/10.1016/j.mri.2015.03.011 Text en © 2015 The Authors http://creativecommons.org/licenses/by-nc-nd/4.0/ This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Technical Note
Kersemans, Veerle
Gilchrist, Stuart
Allen, Philip D.
Beech, John S.
Kinchesh, Paul
Vojnovic, Borivoj
Smart, Sean C.
A resistive heating system for homeothermic maintenance in small animals
title A resistive heating system for homeothermic maintenance in small animals
title_full A resistive heating system for homeothermic maintenance in small animals
title_fullStr A resistive heating system for homeothermic maintenance in small animals
title_full_unstemmed A resistive heating system for homeothermic maintenance in small animals
title_short A resistive heating system for homeothermic maintenance in small animals
title_sort resistive heating system for homeothermic maintenance in small animals
topic Technical Note
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4462590/
https://www.ncbi.nlm.nih.gov/pubmed/25863135
http://dx.doi.org/10.1016/j.mri.2015.03.011
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