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An anatomically realistic temperature phantom for radiofrequency heating measurements

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An 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.

RBID : PMC:4136997

Abstract

Purpose

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.

Methods

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.

Results

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.

Conclusion

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:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4136997

DOI: 10.1002/mrm.25123
PubMed: 24549755
PubMed Central: 4136997

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<author><name sortKey="Graedel, Nadine N" sort="Graedel, Nadine N" uniqKey="Graedel N" first="Nadine N." last="Graedel">Nadine N. Graedel</name>
<affiliation wicri:level="1"><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>
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<author><name sortKey="Polimeni, Jonathan R" sort="Polimeni, Jonathan R" uniqKey="Polimeni J" first="Jonathan R." last="Polimeni">Jonathan R. Polimeni</name>
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<front><div type="abstract" xml:lang="en"><sec id="S1"><title>Purpose</title>
<p id="P1">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.</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>
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  <pmc-dir>properties manuscript</pmc-dir>
  <front><journal-meta><journal-id journal-id-type="nlm-journal-id">8505245</journal-id>
<journal-id journal-id-type="pubmed-jr-id">5733</journal-id>
<journal-id journal-id-type="nlm-ta">Magn Reson Med</journal-id>
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<article-id pub-id-type="manuscript">NIHMS565486</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Article</subject>
</subj-group>
</article-categories>
<title-group><article-title>An anatomically realistic temperature phantom for radiofrequency heating measurements</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Graedel</surname>
<given-names>Nadine N.</given-names>
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<xref ref-type="aff" rid="A1">1</xref>
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<contrib contrib-type="author"><name><surname>Polimeni</surname>
<given-names>Jonathan R.</given-names>
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<xref ref-type="aff" rid="A1">1</xref>
<xref ref-type="aff" rid="A2">2</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Guerin</surname>
<given-names>Bastien</given-names>
</name>
<xref ref-type="aff" rid="A1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Gagoski</surname>
<given-names>Borjan</given-names>
</name>
<xref ref-type="aff" rid="A3">3</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Wald</surname>
<given-names>Lawrence L.</given-names>
</name>
<xref ref-type="aff" rid="A1">1</xref>
<xref ref-type="aff" rid="A2">2</xref>
<xref ref-type="aff" rid="A4">4</xref>
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<aff id="A1"><label>1</label>
 A. A. Martinos Center for Biomedical Imaging, MGH, Charlestown, MA, United States</aff>
<aff id="A2"><label>2</label>
 Harvard Medical School, Boston, MA, United States</aff>
<aff id="A3"><label>3</label>
 Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, United States</aff>
<aff id="A4"><label>4</label>
 Harvard-MIT Division of Health Sciences and Technology, MA, Cambridge, United States</aff>
<author-notes><corresp id="CR1"><bold>Correspondence address</bold>
 Prof. Lawrence L. Wald Building 75, Room 2.109 Charlestown, MA 02129 USA <email>wald@nmr.mgh.harvard.edu</email>
 Tel: 617-724-9706 Fax: 617-726-7422</corresp>
</author-notes>
<pub-date pub-type="nihms-submitted"><day>4</day>
<month>4</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub"><day>18</day>
<month>2</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="ppub"><month>1</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="pmc-release"><day>01</day>
<month>1</month>
<year>2016</year>
</pub-date>
<volume>73</volume>
<issue>1</issue>
<fpage>442</fpage>
<lpage>450</lpage>
<pmc-comment>elocation-id from pubmed: 10.1002/mrm.25123</pmc-comment>
      <abstract><sec id="S1"><title>Purpose</title>
<p id="P1">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.</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>
</abstract>
<kwd-group><kwd>phantom</kwd>
<kwd>thermometry</kwd>
<kwd>MR safety</kwd>
<kwd>local SAR</kwd>
<kwd>parallel transmit</kwd>
<kwd>temperature estimation</kwd>
</kwd-group>
</article-meta>
</front>
</pmc>
</record>

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An anatomically realistic temperature phantom for radiofrequency heating measurements

An anatomically realistic temperature phantom for radiofrequency heating measurements

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Abstract

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