Evaluation of radiofrequency safety by high temperature resolution MR thermometry using a paramagnetic lanthanide complex.
Identifieur interne : 000072 ( PubMed/Corpus ); précédent : 000071; suivant : 000073Evaluation of radiofrequency safety by high temperature resolution MR thermometry using a paramagnetic lanthanide complex.
Auteurs : Shalmali Dharmadhikari ; Judy R. James ; John Nyenhuis ; Navin BansalSource :
- Magnetic resonance in medicine [ 1522-2594 ] ; 2016.
Abstract
The current practice of calculating the specific absorption rate (SAR) relies on local temperature measurements made using temperature probes. For an accurate SAR measurement, a temperature imaging method that provides high temperature sensitivity is desirable, because acceptable levels of SAR produce small temperature changes. MR thermometry using paramagnetic lanthanide complexes can be used to obtain absolute temperature measurements with sub-degree temperature and sub-millimeter spatial resolution. The aim of this study was to develop and evaluate a high temperature resolution MR technique to determine SAR.
DOI: 10.1002/mrm.25792
PubMed: 26073056
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Evaluation of radiofrequency safety by high temperature resolution MR thermometry using a paramagnetic lanthanide complex.</title><author><name sortKey="Dharmadhikari, Shalmali" sort="Dharmadhikari, Shalmali" uniqKey="Dharmadhikari S" first="Shalmali" last="Dharmadhikari">Shalmali Dharmadhikari</name><affiliation><nlm:affiliation>School of Health Sciences, Purdue University, West Lafayette, Indiana, USA.</nlm:affiliation></affiliation></author><author><name sortKey="James, Judy R" sort="James, Judy R" uniqKey="James J" first="Judy R" last="James">Judy R. James</name><affiliation><nlm:affiliation>Department of Radiology, Mayo Clinic, Scottsdale, Arizona, USA.</nlm:affiliation></affiliation></author><author><name sortKey="Nyenhuis, John" sort="Nyenhuis, John" uniqKey="Nyenhuis J" first="John" last="Nyenhuis">John Nyenhuis</name><affiliation><nlm:affiliation>Department of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana, USA.</nlm:affiliation></affiliation></author><author><name sortKey="Bansal, Navin" sort="Bansal, Navin" uniqKey="Bansal N" first="Navin" last="Bansal">Navin Bansal</name><affiliation><nlm:affiliation>Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, Indiana, USA.</nlm:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="2016">2016</date><idno type="RBID">pubmed:26073056</idno><idno type="pmid">26073056</idno><idno type="doi">10.1002/mrm.25792</idno><idno type="wicri:Area/PubMed/Corpus">000072</idno><idno type="wicri:explorRef" wicri:stream="PubMed" wicri:step="Corpus" wicri:corpus="PubMed">000072</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Evaluation of radiofrequency safety by high temperature resolution MR thermometry using a paramagnetic lanthanide complex.</title><author><name sortKey="Dharmadhikari, Shalmali" sort="Dharmadhikari, Shalmali" uniqKey="Dharmadhikari S" first="Shalmali" last="Dharmadhikari">Shalmali Dharmadhikari</name><affiliation><nlm:affiliation>School of Health Sciences, Purdue University, West Lafayette, Indiana, USA.</nlm:affiliation></affiliation></author><author><name sortKey="James, Judy R" sort="James, Judy R" uniqKey="James J" first="Judy R" last="James">Judy R. James</name><affiliation><nlm:affiliation>Department of Radiology, Mayo Clinic, Scottsdale, Arizona, USA.</nlm:affiliation></affiliation></author><author><name sortKey="Nyenhuis, John" sort="Nyenhuis, John" uniqKey="Nyenhuis J" first="John" last="Nyenhuis">John Nyenhuis</name><affiliation><nlm:affiliation>Department of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana, USA.</nlm:affiliation></affiliation></author><author><name sortKey="Bansal, Navin" sort="Bansal, Navin" uniqKey="Bansal N" first="Navin" last="Bansal">Navin Bansal</name><affiliation><nlm:affiliation>Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, Indiana, USA.</nlm:affiliation></affiliation></author></analytic><series><title level="j">Magnetic resonance in medicine</title><idno type="eISSN">1522-2594</idno><imprint><date when="2016" type="published">2016</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The current practice of calculating the specific absorption rate (SAR) relies on local temperature measurements made using temperature probes. For an accurate SAR measurement, a temperature imaging method that provides high temperature sensitivity is desirable, because acceptable levels of SAR produce small temperature changes. MR thermometry using paramagnetic lanthanide complexes can be used to obtain absolute temperature measurements with sub-degree temperature and sub-millimeter spatial resolution. The aim of this study was to develop and evaluate a high temperature resolution MR technique to determine SAR.</div></front></TEI><pubmed><MedlineCitation Owner="NLM" Status="In-Data-Review"><PMID Version="1">26073056</PMID><DateCreated><Year>2016</Year><Month>04</Month><Day>15</Day></DateCreated><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1522-2594</ISSN><JournalIssue CitedMedium="Internet"><Volume>75</Volume><Issue>5</Issue><PubDate><Year>2016</Year><Month>May</Month></PubDate></JournalIssue><Title>Magnetic resonance in medicine</Title><ISOAbbreviation>Magn Reson Med</ISOAbbreviation></Journal><ArticleTitle>Evaluation of radiofrequency safety by high temperature resolution MR thermometry using a paramagnetic lanthanide complex.</ArticleTitle><Pagination><MedlinePgn>2121-9</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1002/mrm.25792</ELocationID><Abstract><AbstractText Label="PURPOSE" NlmCategory="OBJECTIVE">The current practice of calculating the specific absorption rate (SAR) relies on local temperature measurements made using temperature probes. For an accurate SAR measurement, a temperature imaging method that provides high temperature sensitivity is desirable, because acceptable levels of SAR produce small temperature changes. MR thermometry using paramagnetic lanthanide complexes can be used to obtain absolute temperature measurements with sub-degree temperature and sub-millimeter spatial resolution. The aim of this study was to develop and evaluate a high temperature resolution MR technique to determine SAR.</AbstractText><AbstractText Label="METHODS" NlmCategory="METHODS">MR thermometry using a paramagnetic lanthanide complex thulium 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrakis (methylene phosphonate) (TmDOTP(5-) ), which has an almost 10(2) times stronger chemical shift temperature dependence than water, was used to develop a novel method for SAR measurement. Three-dimensional temperature and SAR images were calculated using MR images acquired with a conventional gradient recalled echo sequence and SAR-intensive T1ρ sequence. Effects of the presence of conducting wire and increasing T1ρ spin-lock pulse duration were also examined.</AbstractText><AbstractText Label="RESULTS" NlmCategory="RESULTS">SAR distribution could be visualized clearly and surges associated with conducting wires and increasing pulse duration were identified clearly in the computed high spatial resolution SAR images.</AbstractText><AbstractText Label="CONCLUSION" NlmCategory="CONCLUSIONS">A novel method with high temperature sensitivity is proposed as a tool to evaluate radiofrequency safety in MRI. Magn Reson Med 75:2121-2129, 2016. © 2015 Wiley Periodicals, Inc.</AbstractText><CopyrightInformation>© 2015 Wiley Periodicals, Inc.</CopyrightInformation></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Dharmadhikari</LastName><ForeName>Shalmali</ForeName><Initials>S</Initials><Identifier Source="ORCID">http://orcid.org/0000-0001-6225-2172</Identifier><AffiliationInfo><Affiliation>School of Health Sciences, Purdue University, West Lafayette, Indiana, USA.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, Indiana, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>James</LastName><ForeName>Judy R</ForeName><Initials>JR</Initials><AffiliationInfo><Affiliation>Department of Radiology, Mayo Clinic, Scottsdale, Arizona, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Nyenhuis</LastName><ForeName>John</ForeName><Initials>J</Initials><AffiliationInfo><Affiliation>Department of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Bansal</LastName><ForeName>Navin</ForeName><Initials>N</Initials><AffiliationInfo><Affiliation>Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, Indiana, USA.</Affiliation></AffiliationInfo></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2015</Year><Month>06</Month><Day>15</Day></ArticleDate></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Magn Reson Med</MedlineTA><NlmUniqueID>8505245</NlmUniqueID><ISSNLinking>0740-3194</ISSNLinking></MedlineJournalInfo><CitationSubset>IM</CitationSubset><KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="N">MR thermometry</Keyword><Keyword MajorTopicYN="N">RF heating</Keyword><Keyword MajorTopicYN="N">paramagnetic lanthanide complex</Keyword><Keyword MajorTopicYN="N">specific absorption rate (SAR)</Keyword></KeywordList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2015</Year><Month>3</Month><Day>3</Day></PubMedPubDate><PubMedPubDate PubStatus="revised"><Year>2015</Year><Month>5</Month><Day>5</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>2015</Year><Month>5</Month><Day>6</Day></PubMedPubDate><PubMedPubDate PubStatus="aheadofprint"><Year>2015</Year><Month>6</Month><Day>15</Day></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2015</Year><Month>6</Month><Day>16</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2015</Year><Month>6</Month><Day>16</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2015</Year><Month>6</Month><Day>16</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">26073056</ArticleId><ArticleId IdType="doi">10.1002/mrm.25792</ArticleId></ArticleIdList></PubmedData></pubmed></record>Pour manipuler ce document sous Unix (Dilib)
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