Improvement of vessel visibility in time-of-flight MR angiography of the brain
Purpose To improve vessel visibility in time‐of‐flight MR angiography (TOF‐MRA) by careful consideration of coil choice, coil position, and frequency offset and profile of the nonspatially selective chemical shift selective (CHESS) presaturation pulse. Materials and Methods The effects of both the C...
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| Veröffentlicht in: | Journal of magnetic resonance imaging 2008-06, Vol.27 (6), p.1362-1370 |
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| container_title | Journal of magnetic resonance imaging |
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| creator | Shonai, Takaharu Carpenter, Jeffrey S. Lemieux, Susan K. Harada, Kuniaki Omori, Kazumi Kaneko, Nobuaki Fukushima, Takanori |
| description | Purpose
To improve vessel visibility in time‐of‐flight MR angiography (TOF‐MRA) by careful consideration of coil choice, coil position, and frequency offset and profile of the nonspatially selective chemical shift selective (CHESS) presaturation pulse.
Materials and Methods
The effects of both the CHESS and the excitation radiofrequency (RF) pulses on flow signal and signals from stationary substances were evaluated by changing the spatial area where RF pulses were applied to upstream flow in a flow phantom and in human subjects. The difference between the eight‐channel phased‐array receive‐only coil and the transmit–receive coil was evaluated.
Results
The CHESS pulse suppresses the flow signal over a wider frequency range than the signals from stationary substances, especially when using the body coil for transmission. Even without presaturation pulse, the excitation pulse slightly suppressed the flow signal. Adjusting the position of the transmit–receive coil relative to the head improved these TOF‐MRA images. The results were better than those obtained with the eight‐channel coil.
Conclusion
The excitation and the nonspatially selective CHESS pulses degraded the flow signal. Our results suggest that reduced spatial extent of RF pulse application to upstream flow can improve image quality of TOF‐MRA. This result can be implemented on conventional scanners. J. Magn. Reson. Imaging 2008;27:1362–1370. © 2008 Wiley‐Liss, Inc. |
| doi_str_mv | 10.1002/jmri.21371 |
| format | Article |
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To improve vessel visibility in time‐of‐flight MR angiography (TOF‐MRA) by careful consideration of coil choice, coil position, and frequency offset and profile of the nonspatially selective chemical shift selective (CHESS) presaturation pulse.
Materials and Methods
The effects of both the CHESS and the excitation radiofrequency (RF) pulses on flow signal and signals from stationary substances were evaluated by changing the spatial area where RF pulses were applied to upstream flow in a flow phantom and in human subjects. The difference between the eight‐channel phased‐array receive‐only coil and the transmit–receive coil was evaluated.
Results
The CHESS pulse suppresses the flow signal over a wider frequency range than the signals from stationary substances, especially when using the body coil for transmission. Even without presaturation pulse, the excitation pulse slightly suppressed the flow signal. Adjusting the position of the transmit–receive coil relative to the head improved these TOF‐MRA images. The results were better than those obtained with the eight‐channel coil.
Conclusion
The excitation and the nonspatially selective CHESS pulses degraded the flow signal. Our results suggest that reduced spatial extent of RF pulse application to upstream flow can improve image quality of TOF‐MRA. This result can be implemented on conventional scanners. J. Magn. Reson. Imaging 2008;27:1362–1370. © 2008 Wiley‐Liss, Inc.</description><identifier>ISSN: 1053-1807</identifier><identifier>EISSN: 1522-2586</identifier><identifier>DOI: 10.1002/jmri.21371</identifier><identifier>PMID: 18504756</identifier><language>eng</language><publisher>Hoboken: Wiley Subscription Services, Inc., A Wiley Company</publisher><subject>Adult ; arterial signal ; body coil transmission ; Brain - blood supply ; Cerebral Arteries - anatomy & histology ; CHESS fat presaturation ; Female ; Humans ; Image Enhancement - methods ; Image Processing, Computer-Assisted - methods ; Magnetic Resonance Angiography - methods ; Male ; Middle Aged ; noncontrast MRA ; Phantoms, Imaging ; Reference Values ; transmit-receive coil</subject><ispartof>Journal of magnetic resonance imaging, 2008-06, Vol.27 (6), p.1362-1370</ispartof><rights>Copyright © 2008 Wiley‐Liss, Inc.</rights><rights>2008 Wiley-Liss, Inc</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c3821-12f02670cdb54031e7fbf58211c1fe82d26493a1a87ed6e38ddcd2bcea5ace253</citedby><cites>FETCH-LOGICAL-c3821-12f02670cdb54031e7fbf58211c1fe82d26493a1a87ed6e38ddcd2bcea5ace253</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.21371$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2Fjmri.21371$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,776,780,1411,1427,27901,27902,45550,45551,46384,46808</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/18504756$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Shonai, Takaharu</creatorcontrib><creatorcontrib>Carpenter, Jeffrey S.</creatorcontrib><creatorcontrib>Lemieux, Susan K.</creatorcontrib><creatorcontrib>Harada, Kuniaki</creatorcontrib><creatorcontrib>Omori, Kazumi</creatorcontrib><creatorcontrib>Kaneko, Nobuaki</creatorcontrib><creatorcontrib>Fukushima, Takanori</creatorcontrib><title>Improvement of vessel visibility in time-of-flight MR angiography of the brain</title><title>Journal of magnetic resonance imaging</title><addtitle>J. Magn. Reson. Imaging</addtitle><description>Purpose
To improve vessel visibility in time‐of‐flight MR angiography (TOF‐MRA) by careful consideration of coil choice, coil position, and frequency offset and profile of the nonspatially selective chemical shift selective (CHESS) presaturation pulse.
Materials and Methods
The effects of both the CHESS and the excitation radiofrequency (RF) pulses on flow signal and signals from stationary substances were evaluated by changing the spatial area where RF pulses were applied to upstream flow in a flow phantom and in human subjects. The difference between the eight‐channel phased‐array receive‐only coil and the transmit–receive coil was evaluated.
Results
The CHESS pulse suppresses the flow signal over a wider frequency range than the signals from stationary substances, especially when using the body coil for transmission. Even without presaturation pulse, the excitation pulse slightly suppressed the flow signal. Adjusting the position of the transmit–receive coil relative to the head improved these TOF‐MRA images. The results were better than those obtained with the eight‐channel coil.
Conclusion
The excitation and the nonspatially selective CHESS pulses degraded the flow signal. Our results suggest that reduced spatial extent of RF pulse application to upstream flow can improve image quality of TOF‐MRA. This result can be implemented on conventional scanners. J. Magn. Reson. Imaging 2008;27:1362–1370. © 2008 Wiley‐Liss, Inc.</description><subject>Adult</subject><subject>arterial signal</subject><subject>body coil transmission</subject><subject>Brain - blood supply</subject><subject>Cerebral Arteries - anatomy & histology</subject><subject>CHESS fat presaturation</subject><subject>Female</subject><subject>Humans</subject><subject>Image Enhancement - methods</subject><subject>Image Processing, Computer-Assisted - methods</subject><subject>Magnetic Resonance Angiography - methods</subject><subject>Male</subject><subject>Middle Aged</subject><subject>noncontrast MRA</subject><subject>Phantoms, Imaging</subject><subject>Reference Values</subject><subject>transmit-receive coil</subject><issn>1053-1807</issn><issn>1522-2586</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNp9kMtOwzAQRS0E4lHY8AEoKxZIAY9dx-4SISiFAhIPwc5yknFryKPYaaF_T0oL7FjNSHPu1egQsg_0GChlJ6-ld8cMuIQ1sg2CsZgJlay3OxU8BkXlFtkJ4ZVS2ut1xSbZAiVoV4pkm9wOyomvZ1hi1US1jWYYAhbRzAWXusI188hVUeNKjGsb28KNxk10cx-ZauTqkTeT8XyRasYYpd64apdsWFME3FvNDnm6OH88u4yHd_3B2ekwzrhiEAOzlCWSZnkqupQDSpta0V4gA4uK5Szp9rgBoyTmCXKV51nO0gyNMBkywTvkcNnbPv8-xdDo0oUMi8JUWE-DlpCAYkq14NESzHwdgkerJ96Vxs81UL2wpxf29Le9Fj5YtU7TEvM_dKWrBWAJfLgC5_9U6aub-8FPabzMuNDg52_G-DedSC6Ffr7t62v6Aj1-_aCf-Rddaong</recordid><startdate>200806</startdate><enddate>200806</enddate><creator>Shonai, Takaharu</creator><creator>Carpenter, Jeffrey S.</creator><creator>Lemieux, Susan K.</creator><creator>Harada, Kuniaki</creator><creator>Omori, Kazumi</creator><creator>Kaneko, Nobuaki</creator><creator>Fukushima, Takanori</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>200806</creationdate><title>Improvement of vessel visibility in time-of-flight MR angiography of the brain</title><author>Shonai, Takaharu ; Carpenter, Jeffrey S. ; Lemieux, Susan K. ; Harada, Kuniaki ; Omori, Kazumi ; Kaneko, Nobuaki ; Fukushima, Takanori</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3821-12f02670cdb54031e7fbf58211c1fe82d26493a1a87ed6e38ddcd2bcea5ace253</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2008</creationdate><topic>Adult</topic><topic>arterial signal</topic><topic>body coil transmission</topic><topic>Brain - blood supply</topic><topic>Cerebral Arteries - anatomy & histology</topic><topic>CHESS fat presaturation</topic><topic>Female</topic><topic>Humans</topic><topic>Image Enhancement - methods</topic><topic>Image Processing, Computer-Assisted - methods</topic><topic>Magnetic Resonance Angiography - methods</topic><topic>Male</topic><topic>Middle Aged</topic><topic>noncontrast MRA</topic><topic>Phantoms, Imaging</topic><topic>Reference Values</topic><topic>transmit-receive coil</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Shonai, Takaharu</creatorcontrib><creatorcontrib>Carpenter, Jeffrey S.</creatorcontrib><creatorcontrib>Lemieux, Susan K.</creatorcontrib><creatorcontrib>Harada, Kuniaki</creatorcontrib><creatorcontrib>Omori, Kazumi</creatorcontrib><creatorcontrib>Kaneko, Nobuaki</creatorcontrib><creatorcontrib>Fukushima, Takanori</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>Shonai, Takaharu</au><au>Carpenter, Jeffrey S.</au><au>Lemieux, Susan K.</au><au>Harada, Kuniaki</au><au>Omori, Kazumi</au><au>Kaneko, Nobuaki</au><au>Fukushima, Takanori</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Improvement of vessel visibility in time-of-flight MR angiography of the brain</atitle><jtitle>Journal of magnetic resonance imaging</jtitle><addtitle>J. Magn. Reson. Imaging</addtitle><date>2008-06</date><risdate>2008</risdate><volume>27</volume><issue>6</issue><spage>1362</spage><epage>1370</epage><pages>1362-1370</pages><issn>1053-1807</issn><eissn>1522-2586</eissn><abstract>Purpose
To improve vessel visibility in time‐of‐flight MR angiography (TOF‐MRA) by careful consideration of coil choice, coil position, and frequency offset and profile of the nonspatially selective chemical shift selective (CHESS) presaturation pulse.
Materials and Methods
The effects of both the CHESS and the excitation radiofrequency (RF) pulses on flow signal and signals from stationary substances were evaluated by changing the spatial area where RF pulses were applied to upstream flow in a flow phantom and in human subjects. The difference between the eight‐channel phased‐array receive‐only coil and the transmit–receive coil was evaluated.
Results
The CHESS pulse suppresses the flow signal over a wider frequency range than the signals from stationary substances, especially when using the body coil for transmission. Even without presaturation pulse, the excitation pulse slightly suppressed the flow signal. Adjusting the position of the transmit–receive coil relative to the head improved these TOF‐MRA images. The results were better than those obtained with the eight‐channel coil.
Conclusion
The excitation and the nonspatially selective CHESS pulses degraded the flow signal. Our results suggest that reduced spatial extent of RF pulse application to upstream flow can improve image quality of TOF‐MRA. This result can be implemented on conventional scanners. J. Magn. Reson. Imaging 2008;27:1362–1370. © 2008 Wiley‐Liss, Inc.</abstract><cop>Hoboken</cop><pub>Wiley Subscription Services, Inc., A Wiley Company</pub><pmid>18504756</pmid><doi>10.1002/jmri.21371</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Adult arterial signal body coil transmission Brain - blood supply Cerebral Arteries - anatomy & histology CHESS fat presaturation Female Humans Image Enhancement - methods Image Processing, Computer-Assisted - methods Magnetic Resonance Angiography - methods Male Middle Aged noncontrast MRA Phantoms, Imaging Reference Values transmit-receive coil |
| title | Improvement of vessel visibility in time-of-flight MR angiography of the brain |
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