Universal pulses: A new concept for calibration‐free parallel transmission
Purpose A calibration‐free parallel transmission method is investigated to mitigate the radiofrequency (RF) field inhomogeneity problem in brain imaging at 7 Tesla (T). Theory and Methods Six volunteers were scanned to build a representative database of RF and static field maps at 7T. Small‐tip‐angl...
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| Veröffentlicht in: | Magnetic resonance in medicine 2017-02, Vol.77 (2), p.635-643 |
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| creator | Gras, Vincent Vignaud, Alexandre Amadon, Alexis Bihan, Denis Boulant, Nicolas |
| description | Purpose
A calibration‐free parallel transmission method is investigated to mitigate the radiofrequency (RF) field inhomogeneity problem in brain imaging at 7 Tesla (T).
Theory and Methods
Six volunteers were scanned to build a representative database of RF and static field maps at 7T. Small‐tip‐angle and inversion pulses were designed with joint kT‐points trajectory optimization to work robustly on all six subjects. The returned “universal” pulses were then inserted in an MPRAGE sequence implemented on six additional volunteers without further field measurements and pulse optimizations. Similar acquisitions were performed in the circularly polarized mode and with subject‐based optimizations for comparison. Performance of the different approaches was evaluated by means of image analysis and computation of the flip angle normalized root mean square errors (NRMSE).
Results
For both the excitation and inversion, the universal pulses (NRMSE∼11%) outperformed the circularly polarized (NRMSE∼28%) and RF shim modes (NRMSE∼20%) across all volunteers and returned slightly worse results than for subject‐based optimized pulses (NRMSE∼7%).
Conclusion
RF pulses can be designed to robustly mitigate the RF field inhomogeneity problem over a population class. This appears as a first step toward another plug and play parallel transmission solution where the pulse design can be done offline and without measuring subject‐specific field maps. Magn Reson Med 77:635–643, 2017. © 2016 International Society for Magnetic Resonance in Medicine |
| doi_str_mv | 10.1002/mrm.26148 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_hal_p</sourceid><recordid>TN_cdi_hal_primary_oai_HAL_hal_02103499v1</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>4305946661</sourcerecordid><originalsourceid>FETCH-LOGICAL-c5498-32dd7f5bc55a146b4886e1ed11e38dba5d073fa275e5a7ec2f5af6c247959b013</originalsourceid><addsrcrecordid>eNqNkctKxDAYhYMoOl4WvoAU3OiimqRJ2rgbxBvMIIizDmn6FyvpxWQ6w-x8BJ_RJzHjeAFBcRVIPr6cw0Fon-ATgjE9rV19QgVh2RoaEE5pTLlk62iAU4bjhEi2hba9f8QYS5myTbRFRZZlgrMBGk2aagbOaxt1vfXgz6Jh1MA8Mm1joJtGZesio22VOz2t2ub1-aV0AFGnnbYWbDR1uvF15X143EUbpQ6SvY9zB00uL-7Pr-PR7dXN-XAUG85kFie0KNKS54ZzTZjIWcgCBApCIMmKXPMCp0mpacqB6xQMLbkuhaEslVzmmCQ76HjlfdBWda6qtVuoVlfqejhSyztMCU6YlLMle7RiO9c-9eCnKoQ1YK1uoO29IpnIEkYEof9AqRDBmizRwx_oY9u7JpRWlGNJCQtp_6LCt1hQLJn4bmNc672D8qsSwWq5rwr7qvd9A3vwYezzGoov8nPQAJyugHllYfG7SY3vxivlGzZkrTc</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>1860620946</pqid></control><display><type>article</type><title>Universal pulses: A new concept for calibration‐free parallel transmission</title><source>Wiley Free Content</source><source>MEDLINE</source><source>Wiley Online Library Journals Frontfile Complete</source><creator>Gras, Vincent ; Vignaud, Alexandre ; Amadon, Alexis ; Bihan, Denis ; Boulant, Nicolas</creator><creatorcontrib>Gras, Vincent ; Vignaud, Alexandre ; Amadon, Alexis ; Bihan, Denis ; Boulant, Nicolas</creatorcontrib><description>Purpose
A calibration‐free parallel transmission method is investigated to mitigate the radiofrequency (RF) field inhomogeneity problem in brain imaging at 7 Tesla (T).
Theory and Methods
Six volunteers were scanned to build a representative database of RF and static field maps at 7T. Small‐tip‐angle and inversion pulses were designed with joint kT‐points trajectory optimization to work robustly on all six subjects. The returned “universal” pulses were then inserted in an MPRAGE sequence implemented on six additional volunteers without further field measurements and pulse optimizations. Similar acquisitions were performed in the circularly polarized mode and with subject‐based optimizations for comparison. Performance of the different approaches was evaluated by means of image analysis and computation of the flip angle normalized root mean square errors (NRMSE).
Results
For both the excitation and inversion, the universal pulses (NRMSE∼11%) outperformed the circularly polarized (NRMSE∼28%) and RF shim modes (NRMSE∼20%) across all volunteers and returned slightly worse results than for subject‐based optimized pulses (NRMSE∼7%).
Conclusion
RF pulses can be designed to robustly mitigate the RF field inhomogeneity problem over a population class. This appears as a first step toward another plug and play parallel transmission solution where the pulse design can be done offline and without measuring subject‐specific field maps. Magn Reson Med 77:635–643, 2017. © 2016 International Society for Magnetic Resonance in Medicine</description><identifier>ISSN: 0740-3194</identifier><identifier>EISSN: 1522-2594</identifier><identifier>DOI: 10.1002/mrm.26148</identifier><identifier>PMID: 26888654</identifier><identifier>CODEN: MRMEEN</identifier><language>eng</language><publisher>United States: Wiley Subscription Services, Inc</publisher><subject>Adult ; Algorithms ; Bioengineering ; Brain - anatomy & histology ; Calibration ; Circular polarization ; Engineering Sciences ; Female ; Humans ; Image analysis ; Image Enhancement - methods ; Image Interpretation, Computer-Assisted - methods ; Image processing ; Inhomogeneity ; Inversion ; Life Sciences ; Magnetic resonance ; Magnetic Resonance Imaging - methods ; Male ; Neuroimaging ; parallel transmission ; Plug & play ; plug and play ; Radio frequency ; Reproducibility of Results ; RF pulse design ; Sensitivity and Specificity ; Signal Processing, Computer-Assisted ; Trajectory optimization ; ultra‐high field</subject><ispartof>Magnetic resonance in medicine, 2017-02, Vol.77 (2), p.635-643</ispartof><rights>2016 International Society for Magnetic Resonance in Medicine</rights><rights>2016 International Society for Magnetic Resonance in Medicine.</rights><rights>2017 International Society for Magnetic Resonance in Medicine</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c5498-32dd7f5bc55a146b4886e1ed11e38dba5d073fa275e5a7ec2f5af6c247959b013</citedby><cites>FETCH-LOGICAL-c5498-32dd7f5bc55a146b4886e1ed11e38dba5d073fa275e5a7ec2f5af6c247959b013</cites><orcidid>0000-0001-9203-0247 ; 0000-0002-2667-9387</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2Fmrm.26148$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2Fmrm.26148$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>230,314,776,780,881,1411,1427,27901,27902,45550,45551,46384,46808</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/26888654$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink><backlink>$$Uhttps://hal.science/hal-02103499$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Gras, Vincent</creatorcontrib><creatorcontrib>Vignaud, Alexandre</creatorcontrib><creatorcontrib>Amadon, Alexis</creatorcontrib><creatorcontrib>Bihan, Denis</creatorcontrib><creatorcontrib>Boulant, Nicolas</creatorcontrib><title>Universal pulses: A new concept for calibration‐free parallel transmission</title><title>Magnetic resonance in medicine</title><addtitle>Magn Reson Med</addtitle><description>Purpose
A calibration‐free parallel transmission method is investigated to mitigate the radiofrequency (RF) field inhomogeneity problem in brain imaging at 7 Tesla (T).
Theory and Methods
Six volunteers were scanned to build a representative database of RF and static field maps at 7T. Small‐tip‐angle and inversion pulses were designed with joint kT‐points trajectory optimization to work robustly on all six subjects. The returned “universal” pulses were then inserted in an MPRAGE sequence implemented on six additional volunteers without further field measurements and pulse optimizations. Similar acquisitions were performed in the circularly polarized mode and with subject‐based optimizations for comparison. Performance of the different approaches was evaluated by means of image analysis and computation of the flip angle normalized root mean square errors (NRMSE).
Results
For both the excitation and inversion, the universal pulses (NRMSE∼11%) outperformed the circularly polarized (NRMSE∼28%) and RF shim modes (NRMSE∼20%) across all volunteers and returned slightly worse results than for subject‐based optimized pulses (NRMSE∼7%).
Conclusion
RF pulses can be designed to robustly mitigate the RF field inhomogeneity problem over a population class. This appears as a first step toward another plug and play parallel transmission solution where the pulse design can be done offline and without measuring subject‐specific field maps. Magn Reson Med 77:635–643, 2017. © 2016 International Society for Magnetic Resonance in Medicine</description><subject>Adult</subject><subject>Algorithms</subject><subject>Bioengineering</subject><subject>Brain - anatomy & histology</subject><subject>Calibration</subject><subject>Circular polarization</subject><subject>Engineering Sciences</subject><subject>Female</subject><subject>Humans</subject><subject>Image analysis</subject><subject>Image Enhancement - methods</subject><subject>Image Interpretation, Computer-Assisted - methods</subject><subject>Image processing</subject><subject>Inhomogeneity</subject><subject>Inversion</subject><subject>Life Sciences</subject><subject>Magnetic resonance</subject><subject>Magnetic Resonance Imaging - methods</subject><subject>Male</subject><subject>Neuroimaging</subject><subject>parallel transmission</subject><subject>Plug & play</subject><subject>plug and play</subject><subject>Radio frequency</subject><subject>Reproducibility of Results</subject><subject>RF pulse design</subject><subject>Sensitivity and Specificity</subject><subject>Signal Processing, Computer-Assisted</subject><subject>Trajectory optimization</subject><subject>ultra‐high field</subject><issn>0740-3194</issn><issn>1522-2594</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqNkctKxDAYhYMoOl4WvoAU3OiimqRJ2rgbxBvMIIizDmn6FyvpxWQ6w-x8BJ_RJzHjeAFBcRVIPr6cw0Fon-ATgjE9rV19QgVh2RoaEE5pTLlk62iAU4bjhEi2hba9f8QYS5myTbRFRZZlgrMBGk2aagbOaxt1vfXgz6Jh1MA8Mm1joJtGZesio22VOz2t2ub1-aV0AFGnnbYWbDR1uvF15X143EUbpQ6SvY9zB00uL-7Pr-PR7dXN-XAUG85kFie0KNKS54ZzTZjIWcgCBApCIMmKXPMCp0mpacqB6xQMLbkuhaEslVzmmCQ76HjlfdBWda6qtVuoVlfqejhSyztMCU6YlLMle7RiO9c-9eCnKoQ1YK1uoO29IpnIEkYEof9AqRDBmizRwx_oY9u7JpRWlGNJCQtp_6LCt1hQLJn4bmNc672D8qsSwWq5rwr7qvd9A3vwYezzGoov8nPQAJyugHllYfG7SY3vxivlGzZkrTc</recordid><startdate>201702</startdate><enddate>201702</enddate><creator>Gras, Vincent</creator><creator>Vignaud, Alexandre</creator><creator>Amadon, Alexis</creator><creator>Bihan, Denis</creator><creator>Boulant, Nicolas</creator><general>Wiley Subscription Services, Inc</general><general>Wiley</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>FR3</scope><scope>K9.</scope><scope>M7Z</scope><scope>P64</scope><scope>7X8</scope><scope>7QO</scope><scope>1XC</scope><scope>VOOES</scope><orcidid>https://orcid.org/0000-0001-9203-0247</orcidid><orcidid>https://orcid.org/0000-0002-2667-9387</orcidid></search><sort><creationdate>201702</creationdate><title>Universal pulses: A new concept for calibration‐free parallel transmission</title><author>Gras, Vincent ; Vignaud, Alexandre ; Amadon, Alexis ; Bihan, Denis ; Boulant, Nicolas</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c5498-32dd7f5bc55a146b4886e1ed11e38dba5d073fa275e5a7ec2f5af6c247959b013</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Adult</topic><topic>Algorithms</topic><topic>Bioengineering</topic><topic>Brain - anatomy & histology</topic><topic>Calibration</topic><topic>Circular polarization</topic><topic>Engineering Sciences</topic><topic>Female</topic><topic>Humans</topic><topic>Image analysis</topic><topic>Image Enhancement - methods</topic><topic>Image Interpretation, Computer-Assisted - methods</topic><topic>Image processing</topic><topic>Inhomogeneity</topic><topic>Inversion</topic><topic>Life Sciences</topic><topic>Magnetic resonance</topic><topic>Magnetic Resonance Imaging - methods</topic><topic>Male</topic><topic>Neuroimaging</topic><topic>parallel transmission</topic><topic>Plug & play</topic><topic>plug and play</topic><topic>Radio frequency</topic><topic>Reproducibility of Results</topic><topic>RF pulse design</topic><topic>Sensitivity and Specificity</topic><topic>Signal Processing, Computer-Assisted</topic><topic>Trajectory optimization</topic><topic>ultra‐high field</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Gras, Vincent</creatorcontrib><creatorcontrib>Vignaud, Alexandre</creatorcontrib><creatorcontrib>Amadon, Alexis</creatorcontrib><creatorcontrib>Bihan, Denis</creatorcontrib><creatorcontrib>Boulant, Nicolas</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>ProQuest Health & Medical Complete (Alumni)</collection><collection>Biochemistry Abstracts 1</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>MEDLINE - Academic</collection><collection>Biotechnology Research Abstracts</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>Magnetic resonance in medicine</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Gras, Vincent</au><au>Vignaud, Alexandre</au><au>Amadon, Alexis</au><au>Bihan, Denis</au><au>Boulant, Nicolas</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Universal pulses: A new concept for calibration‐free parallel transmission</atitle><jtitle>Magnetic resonance in medicine</jtitle><addtitle>Magn Reson Med</addtitle><date>2017-02</date><risdate>2017</risdate><volume>77</volume><issue>2</issue><spage>635</spage><epage>643</epage><pages>635-643</pages><issn>0740-3194</issn><eissn>1522-2594</eissn><coden>MRMEEN</coden><abstract>Purpose
A calibration‐free parallel transmission method is investigated to mitigate the radiofrequency (RF) field inhomogeneity problem in brain imaging at 7 Tesla (T).
Theory and Methods
Six volunteers were scanned to build a representative database of RF and static field maps at 7T. Small‐tip‐angle and inversion pulses were designed with joint kT‐points trajectory optimization to work robustly on all six subjects. The returned “universal” pulses were then inserted in an MPRAGE sequence implemented on six additional volunteers without further field measurements and pulse optimizations. Similar acquisitions were performed in the circularly polarized mode and with subject‐based optimizations for comparison. Performance of the different approaches was evaluated by means of image analysis and computation of the flip angle normalized root mean square errors (NRMSE).
Results
For both the excitation and inversion, the universal pulses (NRMSE∼11%) outperformed the circularly polarized (NRMSE∼28%) and RF shim modes (NRMSE∼20%) across all volunteers and returned slightly worse results than for subject‐based optimized pulses (NRMSE∼7%).
Conclusion
RF pulses can be designed to robustly mitigate the RF field inhomogeneity problem over a population class. This appears as a first step toward another plug and play parallel transmission solution where the pulse design can be done offline and without measuring subject‐specific field maps. Magn Reson Med 77:635–643, 2017. © 2016 International Society for Magnetic Resonance in Medicine</abstract><cop>United States</cop><pub>Wiley Subscription Services, Inc</pub><pmid>26888654</pmid><doi>10.1002/mrm.26148</doi><tpages>9</tpages><orcidid>https://orcid.org/0000-0001-9203-0247</orcidid><orcidid>https://orcid.org/0000-0002-2667-9387</orcidid><oa>free_for_read</oa></addata></record> |
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| ispartof | Magnetic resonance in medicine, 2017-02, Vol.77 (2), p.635-643 |
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| source | Wiley Free Content; MEDLINE; Wiley Online Library Journals Frontfile Complete |
| subjects | Adult Algorithms Bioengineering Brain - anatomy & histology Calibration Circular polarization Engineering Sciences Female Humans Image analysis Image Enhancement - methods Image Interpretation, Computer-Assisted - methods Image processing Inhomogeneity Inversion Life Sciences Magnetic resonance Magnetic Resonance Imaging - methods Male Neuroimaging parallel transmission Plug & play plug and play Radio frequency Reproducibility of Results RF pulse design Sensitivity and Specificity Signal Processing, Computer-Assisted Trajectory optimization ultra‐high field |
| title | Universal pulses: A new concept for calibration‐free parallel transmission |
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