A method for preamplifier-decoupling improvement in quadrature phased-array coils
Purpose To improve preamplifier decoupling in a quadrature phased‐array coil using a new quadrature combiner configuration. Materials and Methods A commercial six‐element quadrature cervical‐thoracic‐lumbar (CTL) coil was used on a 1.5 T GE Signa Lx Scanner. The new combiner configuration is designe...
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| Veröffentlicht in: | Journal of magnetic resonance imaging 2004-02, Vol.19 (2), p.255-258 |
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| container_title | Journal of magnetic resonance imaging |
| container_volume | 19 |
| creator | Guclu, Ceylan Celil Boskamp, Ed Zheng, Tsinghua Becerra, Ricardo Blawat, LeRoy |
| description | Purpose
To improve preamplifier decoupling in a quadrature phased‐array coil using a new quadrature combiner configuration.
Materials and Methods
A commercial six‐element quadrature cervical‐thoracic‐lumbar (CTL) coil was used on a 1.5 T GE Signa Lx Scanner. The new combiner configuration is designed based on the fact that when one compares the amount of flux linkage of two loops with butterfly elements separated by the same distance, the loop elements have much higher coupling than the butterfly elements.
Results
The results are demonstrated using an imaging‐based element coupling measurement method. The new quadrature combiner configuration has introduced an approximately −8dB improvement in preamplifier decoupling.
Conclusion
One‐dimensional quadrature phased arrays can be built even if the preamplifier is not integrated in the coil. If the combiner is placed between the coil and the preamplifiers, the butterflies should be on the high impedance side of the quadrature combiner. The loops should see the low input impedance of the preamplifiers. J. Magn. Reson. Imaging 2004;19:255–258. © 2004 Wiley‐Liss, Inc. |
| doi_str_mv | 10.1002/jmri.10449 |
| format | Article |
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To improve preamplifier decoupling in a quadrature phased‐array coil using a new quadrature combiner configuration.
Materials and Methods
A commercial six‐element quadrature cervical‐thoracic‐lumbar (CTL) coil was used on a 1.5 T GE Signa Lx Scanner. The new combiner configuration is designed based on the fact that when one compares the amount of flux linkage of two loops with butterfly elements separated by the same distance, the loop elements have much higher coupling than the butterfly elements.
Results
The results are demonstrated using an imaging‐based element coupling measurement method. The new quadrature combiner configuration has introduced an approximately −8dB improvement in preamplifier decoupling.
Conclusion
One‐dimensional quadrature phased arrays can be built even if the preamplifier is not integrated in the coil. If the combiner is placed between the coil and the preamplifiers, the butterflies should be on the high impedance side of the quadrature combiner. The loops should see the low input impedance of the preamplifiers. J. Magn. Reson. Imaging 2004;19:255–258. © 2004 Wiley‐Liss, Inc.</description><identifier>ISSN: 1053-1807</identifier><identifier>EISSN: 1522-2586</identifier><identifier>DOI: 10.1002/jmri.10449</identifier><identifier>PMID: 14745761</identifier><language>eng</language><publisher>Hoboken: Wiley Subscription Services, Inc., A Wiley Company</publisher><subject>Amplifiers, Electronic ; coupling ; Equipment Design ; Image Enhancement - instrumentation ; magnetic resonance imaging ; Magnetic Resonance Imaging - instrumentation ; phased-array RF coils ; preamplifier coupling ; RT coils</subject><ispartof>Journal of magnetic resonance imaging, 2004-02, Vol.19 (2), p.255-258</ispartof><rights>Copyright © 2004 Wiley‐Liss, Inc.</rights><rights>Copyright 2004 Wiley-Liss, Inc.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c3999-a2a114db0426ba22593381c87d9126af2c63982da6102e35fe31723a0719dbcd3</citedby><cites>FETCH-LOGICAL-c3999-a2a114db0426ba22593381c87d9126af2c63982da6102e35fe31723a0719dbcd3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2Fjmri.10449$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2Fjmri.10449$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,1433,27923,27924,45573,45574,46408,46832</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/14745761$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Guclu, Ceylan Celil</creatorcontrib><creatorcontrib>Boskamp, Ed</creatorcontrib><creatorcontrib>Zheng, Tsinghua</creatorcontrib><creatorcontrib>Becerra, Ricardo</creatorcontrib><creatorcontrib>Blawat, LeRoy</creatorcontrib><title>A method for preamplifier-decoupling improvement in quadrature phased-array coils</title><title>Journal of magnetic resonance imaging</title><addtitle>J. Magn. Reson. Imaging</addtitle><description>Purpose
To improve preamplifier decoupling in a quadrature phased‐array coil using a new quadrature combiner configuration.
Materials and Methods
A commercial six‐element quadrature cervical‐thoracic‐lumbar (CTL) coil was used on a 1.5 T GE Signa Lx Scanner. The new combiner configuration is designed based on the fact that when one compares the amount of flux linkage of two loops with butterfly elements separated by the same distance, the loop elements have much higher coupling than the butterfly elements.
Results
The results are demonstrated using an imaging‐based element coupling measurement method. The new quadrature combiner configuration has introduced an approximately −8dB improvement in preamplifier decoupling.
Conclusion
One‐dimensional quadrature phased arrays can be built even if the preamplifier is not integrated in the coil. If the combiner is placed between the coil and the preamplifiers, the butterflies should be on the high impedance side of the quadrature combiner. The loops should see the low input impedance of the preamplifiers. J. Magn. Reson. Imaging 2004;19:255–258. © 2004 Wiley‐Liss, Inc.</description><subject>Amplifiers, Electronic</subject><subject>coupling</subject><subject>Equipment Design</subject><subject>Image Enhancement - instrumentation</subject><subject>magnetic resonance imaging</subject><subject>Magnetic Resonance Imaging - instrumentation</subject><subject>phased-array RF coils</subject><subject>preamplifier coupling</subject><subject>RT coils</subject><issn>1053-1807</issn><issn>1522-2586</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2004</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNp9kMtOwzAQRS0E4r3hA1BWLJACHjsPe1m1UIrKUyCWlhtPwCVpUjsB-vcEWmDHamakc69Gh5ADoCdAKTudls52WxTJNbINMWMhi0Wy3u005iEImm6RHe-nlFIpo3iTbEGURnGawDa56wUlNi-VCfLKBbVDXdaFzS260GBWtd0xew5sWbvqDUucNYGdBfNWG6eb1mFQv2iPJtTO6UWQVbbwe2Qj14XH_dXcJY_nZw_9i3B8Mxz1e-Mw41LKUDMNEJkJjVgy0YzFknMBmUiNBJbonGUJl4IZnQBlyOMcOaSMa5qCNJPM8F1ytOztXpu36BtVWp9hUegZVq1XggIIwWUHHi_BzFXeO8xV7Wyp3UIBVV8C1ZdA9S2wgw9Xre2kRPOHrox1ACyBd1vg4p8qdXl1P_opDZcZ6xv8-M1o96qSlKexeroeKsEGg-sr3le3_BMzCoqF</recordid><startdate>200402</startdate><enddate>200402</enddate><creator>Guclu, Ceylan Celil</creator><creator>Boskamp, Ed</creator><creator>Zheng, Tsinghua</creator><creator>Becerra, Ricardo</creator><creator>Blawat, LeRoy</creator><general>Wiley Subscription Services, Inc., A Wiley Company</general><scope>BSCLL</scope><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>7X8</scope></search><sort><creationdate>200402</creationdate><title>A method for preamplifier-decoupling improvement in quadrature phased-array coils</title><author>Guclu, Ceylan Celil ; Boskamp, Ed ; Zheng, Tsinghua ; Becerra, Ricardo ; Blawat, LeRoy</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3999-a2a114db0426ba22593381c87d9126af2c63982da6102e35fe31723a0719dbcd3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2004</creationdate><topic>Amplifiers, Electronic</topic><topic>coupling</topic><topic>Equipment Design</topic><topic>Image Enhancement - instrumentation</topic><topic>magnetic resonance imaging</topic><topic>Magnetic Resonance Imaging - instrumentation</topic><topic>phased-array RF coils</topic><topic>preamplifier coupling</topic><topic>RT coils</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Guclu, Ceylan Celil</creatorcontrib><creatorcontrib>Boskamp, Ed</creatorcontrib><creatorcontrib>Zheng, Tsinghua</creatorcontrib><creatorcontrib>Becerra, Ricardo</creatorcontrib><creatorcontrib>Blawat, LeRoy</creatorcontrib><collection>Istex</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Journal of magnetic resonance imaging</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Guclu, Ceylan Celil</au><au>Boskamp, Ed</au><au>Zheng, Tsinghua</au><au>Becerra, Ricardo</au><au>Blawat, LeRoy</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A method for preamplifier-decoupling improvement in quadrature phased-array coils</atitle><jtitle>Journal of magnetic resonance imaging</jtitle><addtitle>J. Magn. Reson. Imaging</addtitle><date>2004-02</date><risdate>2004</risdate><volume>19</volume><issue>2</issue><spage>255</spage><epage>258</epage><pages>255-258</pages><issn>1053-1807</issn><eissn>1522-2586</eissn><abstract>Purpose
To improve preamplifier decoupling in a quadrature phased‐array coil using a new quadrature combiner configuration.
Materials and Methods
A commercial six‐element quadrature cervical‐thoracic‐lumbar (CTL) coil was used on a 1.5 T GE Signa Lx Scanner. The new combiner configuration is designed based on the fact that when one compares the amount of flux linkage of two loops with butterfly elements separated by the same distance, the loop elements have much higher coupling than the butterfly elements.
Results
The results are demonstrated using an imaging‐based element coupling measurement method. The new quadrature combiner configuration has introduced an approximately −8dB improvement in preamplifier decoupling.
Conclusion
One‐dimensional quadrature phased arrays can be built even if the preamplifier is not integrated in the coil. If the combiner is placed between the coil and the preamplifiers, the butterflies should be on the high impedance side of the quadrature combiner. The loops should see the low input impedance of the preamplifiers. J. Magn. Reson. Imaging 2004;19:255–258. © 2004 Wiley‐Liss, Inc.</abstract><cop>Hoboken</cop><pub>Wiley Subscription Services, Inc., A Wiley Company</pub><pmid>14745761</pmid><doi>10.1002/jmri.10449</doi><tpages>4</tpages><oa>free_for_read</oa></addata></record> |
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| language | eng |
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| source | MEDLINE; Wiley Free Content; Wiley Online Library All Journals |
| subjects | Amplifiers, Electronic coupling Equipment Design Image Enhancement - instrumentation magnetic resonance imaging Magnetic Resonance Imaging - instrumentation phased-array RF coils preamplifier coupling RT coils |
| title | A method for preamplifier-decoupling improvement in quadrature phased-array coils |
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