An anatomically realistic temperature phantom for radiofrequency heating measurements
Identifieur interne : 000353 ( Main/Exploration ); précédent : 000352; suivant : 000354An anatomically realistic temperature phantom for radiofrequency heating measurements
Auteurs : Nadine N. Graedel [États-Unis] ; Jonathan R. Polimeni [États-Unis] ; Bastien Guerin [États-Unis] ; Borjan Gagoski [États-Unis] ; Lawrence L. Wald [États-Unis]Source :
- Magnetic resonance in medicine [ 0740-3194 ] ; 2014.
Abstract
An anthropomorphic phantom with realistic electrical properties allows for a more accurate reproduction of tissue current patterns during excitation. A temperature map can then probe the worst-case heating expected in the un-perfused case. We describe an anatomically realistic human head phantom that allows rapid 3D temperature mapping at 7 T.
The phantom was based on hand-labeled anatomical imaging data and consists of four compartments matching the corresponding human tissues in geometry and electrical properties. The increases in temperature resulting from radiofrequency excitation were measured with MR thermometry using a temperature sensitive contrast agent (TmDOTMA−) validated by direct fiber optic temperature measurements.
Acquisition of 3D temperature maps of the full phantom with a temperature accuracy better than 0.1°C was achieved with an isotropic resolution of 5 mm and acquisition times of 2–4 minutes.
Our results demonstrate the feasibility of constructing anatomically realistic phantoms with complex geometries incorporating the ability to measure accurate temperature maps in the phantom. The anthropomorphic temperature phantom is expected to provide a useful tool for the evaluation of the heating effects of both conventional and parallel transmit pulses and help validate electromagnetic and temperature simulations.
Url:
DOI: 10.1002/mrm.25123
PubMed: 24549755
PubMed Central: 4136997
Affiliations:
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Graedel</name><affiliation wicri:level="2"><nlm:aff id="A1"> A. A. Martinos Center for Biomedical Imaging, MGH, Charlestown, MA, United States</nlm:aff><country xml:lang="fr">États-Unis</country><wicri:regionArea> A. A. Martinos Center for Biomedical Imaging, MGH, Charlestown, MA</wicri:regionArea><placeName><region type="state">Massachusetts</region></placeName></affiliation></author><author><name sortKey="Polimeni, Jonathan R" sort="Polimeni, Jonathan R" uniqKey="Polimeni J" first="Jonathan R." last="Polimeni">Jonathan R. Polimeni</name><affiliation wicri:level="2"><nlm:aff id="A1"> A. A. Martinos Center for Biomedical Imaging, MGH, Charlestown, MA, United States</nlm:aff><country xml:lang="fr">États-Unis</country><wicri:regionArea> A. A. 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Martinos Center for Biomedical Imaging, MGH, Charlestown, MA, United States</nlm:aff><country xml:lang="fr">États-Unis</country><wicri:regionArea> A. A. 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A temperature map can then probe the worst-case heating expected in the un-perfused case. We describe an anatomically realistic human head phantom that allows rapid 3D temperature mapping at 7 T.</p></sec><sec id="S2"><title>Methods</title><p id="P2">The phantom was based on hand-labeled anatomical imaging data and consists of four compartments matching the corresponding human tissues in geometry and electrical properties. The increases in temperature resulting from radiofrequency excitation were measured with MR thermometry using a temperature sensitive contrast agent (TmDOTMA<sup>−</sup>) validated by direct fiber optic temperature measurements.</p></sec><sec id="S3"><title>Results</title><p id="P3">Acquisition of 3D temperature maps of the full phantom with a temperature accuracy better than 0.1°C was achieved with an isotropic resolution of 5 mm and acquisition times of 2–4 minutes.</p></sec><sec id="S4"><title>Conclusion</title><p id="P4">Our results demonstrate the feasibility of constructing anatomically realistic phantoms with complex geometries incorporating the ability to measure accurate temperature maps in the phantom. The anthropomorphic temperature phantom is expected to provide a useful tool for the evaluation of the heating effects of both conventional and parallel transmit pulses and help validate electromagnetic and temperature simulations.</p></sec></div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Massachusetts</li></region></list><tree><country name="États-Unis"><region name="Massachusetts"><name sortKey="Graedel, Nadine N" sort="Graedel, Nadine N" uniqKey="Graedel N" first="Nadine N." last="Graedel">Nadine N. Graedel</name></region><name sortKey="Gagoski, Borjan" sort="Gagoski, Borjan" uniqKey="Gagoski B" first="Borjan" last="Gagoski">Borjan Gagoski</name><name sortKey="Guerin, Bastien" sort="Guerin, Bastien" uniqKey="Guerin B" first="Bastien" last="Guerin">Bastien Guerin</name><name sortKey="Polimeni, Jonathan R" sort="Polimeni, Jonathan R" uniqKey="Polimeni J" first="Jonathan R." last="Polimeni">Jonathan R. Polimeni</name><name sortKey="Polimeni, Jonathan R" sort="Polimeni, Jonathan R" uniqKey="Polimeni J" first="Jonathan R." last="Polimeni">Jonathan R. Polimeni</name><name sortKey="Wald, Lawrence L" sort="Wald, Lawrence L" uniqKey="Wald L" first="Lawrence L." last="Wald">Lawrence L. Wald</name><name sortKey="Wald, Lawrence L" sort="Wald, Lawrence L" uniqKey="Wald L" first="Lawrence L." last="Wald">Lawrence L. Wald</name><name sortKey="Wald, Lawrence L" sort="Wald, Lawrence L" uniqKey="Wald L" first="Lawrence L." last="Wald">Lawrence L. Wald</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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