Transmission line analysis of noncylindrical birdcage resonators
Transmission line theory, validated for the standard cylindrical birdcage coil, has been employed for the analysis of a rectangular birdcage resonator which is useful for MR imaging of the hand. Due to lack of cylindrical symmetry in the rectangular coil, RF field uniformity was evaluated and found...
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| Veröffentlicht in: | Magnetic resonance imaging 1994, Vol.12 (5), p.785-797 |
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| container_title | Magnetic resonance imaging |
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| creator | VULLO, T PASCONE, R MANCUSO, R ZIPAGAN, R CAHILL, P. T |
| description | Transmission line theory, validated for the standard cylindrical birdcage coil, has been employed for the analysis of a rectangular birdcage resonator which is useful for MR imaging of the hand. Due to lack of cylindrical symmetry in the rectangular coil, RF field uniformity was evaluated and found to be critically dependent upon the choice of column from which the coil was linearly driven. Effective L1 and L2 inductance elements were determined using known formulas for self and mutual inductance contributions, and compensation of the different inductance elements of the hand coil was performed to produce cylindrically symmetric birdcage current patterns. RF field mapping using the Biot-Savart law demonstrated a rectangular coil sensitivity 22% greater than a comparable cylindrical version. MR hand and wrist images were acquired using the rectangular birdcage coil. In addition, transmission line analysis was extended to other noncylindrical birdcage geometries. |
| doi_str_mv | 10.1016/0730-725X(94)92203-9 |
| format | Article |
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In addition, transmission line analysis was extended to other noncylindrical birdcage geometries.</description><identifier>ISSN: 0730-725X</identifier><identifier>EISSN: 1873-5894</identifier><identifier>DOI: 10.1016/0730-725X(94)92203-9</identifier><identifier>PMID: 7934665</identifier><identifier>CODEN: MRIMDQ</identifier><language>eng</language><publisher>New York, NY: Elsevier Science</publisher><subject>Biological and medical sciences ; Hand - pathology ; Humans ; Investigative techniques, diagnostic techniques (general aspects) ; Magnetic Resonance Imaging - instrumentation ; Magnetic Resonance Imaging - methods ; Medical sciences ; Miscellaneous. Technology ; Models, Structural ; Models, Theoretical ; Radiodiagnosis. Nmr imagery. 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T</creatorcontrib><title>Transmission line analysis of noncylindrical birdcage resonators</title><title>Magnetic resonance imaging</title><addtitle>Magn Reson Imaging</addtitle><description>Transmission line theory, validated for the standard cylindrical birdcage coil, has been employed for the analysis of a rectangular birdcage resonator which is useful for MR imaging of the hand. Due to lack of cylindrical symmetry in the rectangular coil, RF field uniformity was evaluated and found to be critically dependent upon the choice of column from which the coil was linearly driven. Effective L1 and L2 inductance elements were determined using known formulas for self and mutual inductance contributions, and compensation of the different inductance elements of the hand coil was performed to produce cylindrically symmetric birdcage current patterns. RF field mapping using the Biot-Savart law demonstrated a rectangular coil sensitivity 22% greater than a comparable cylindrical version. MR hand and wrist images were acquired using the rectangular birdcage coil. In addition, transmission line analysis was extended to other noncylindrical birdcage geometries.</description><subject>Biological and medical sciences</subject><subject>Hand - pathology</subject><subject>Humans</subject><subject>Investigative techniques, diagnostic techniques (general aspects)</subject><subject>Magnetic Resonance Imaging - instrumentation</subject><subject>Magnetic Resonance Imaging - methods</subject><subject>Medical sciences</subject><subject>Miscellaneous. Technology</subject><subject>Models, Structural</subject><subject>Models, Theoretical</subject><subject>Radiodiagnosis. Nmr imagery. 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Nmr spectrometry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>VULLO, T</creatorcontrib><creatorcontrib>PASCONE, R</creatorcontrib><creatorcontrib>MANCUSO, R</creatorcontrib><creatorcontrib>ZIPAGAN, R</creatorcontrib><creatorcontrib>CAHILL, P. T</creatorcontrib><collection>Pascal-Francis</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>Magnetic resonance imaging</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>VULLO, T</au><au>PASCONE, R</au><au>MANCUSO, R</au><au>ZIPAGAN, R</au><au>CAHILL, P. T</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Transmission line analysis of noncylindrical birdcage resonators</atitle><jtitle>Magnetic resonance imaging</jtitle><addtitle>Magn Reson Imaging</addtitle><date>1994</date><risdate>1994</risdate><volume>12</volume><issue>5</issue><spage>785</spage><epage>797</epage><pages>785-797</pages><issn>0730-725X</issn><eissn>1873-5894</eissn><coden>MRIMDQ</coden><abstract>Transmission line theory, validated for the standard cylindrical birdcage coil, has been employed for the analysis of a rectangular birdcage resonator which is useful for MR imaging of the hand. Due to lack of cylindrical symmetry in the rectangular coil, RF field uniformity was evaluated and found to be critically dependent upon the choice of column from which the coil was linearly driven. 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| ispartof | Magnetic resonance imaging, 1994, Vol.12 (5), p.785-797 |
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| language | eng |
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| source | MEDLINE; Elsevier ScienceDirect Journals Complete |
| subjects | Biological and medical sciences Hand - pathology Humans Investigative techniques, diagnostic techniques (general aspects) Magnetic Resonance Imaging - instrumentation Magnetic Resonance Imaging - methods Medical sciences Miscellaneous. Technology Models, Structural Models, Theoretical Radiodiagnosis. Nmr imagery. Nmr spectrometry |
| title | Transmission line analysis of noncylindrical birdcage resonators |
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