Understanding and optimizing the amplitude modulated control for multiple-slice continuous arterial spin labeling
Multiple‐slice perfusion imaging by continuous arterial spin labeling (CASL) is made possible by amplitude modulation (AM) of the labeling RF pulse, but perfusion sensitivity is reduced relative to the single‐slice technique. A computer model of the Bloch equations for velocity driven adiabatic fast...
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| Veröffentlicht in: | Magnetic resonance in medicine 2005-09, Vol.54 (3), p.594-604 |
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| creator | Utting, Jane F. Thomas, David L. Gadian, David G. Helliar, Robert W. Lythgoe, Mark F. Ordidge, Roger J. |
| description | Multiple‐slice perfusion imaging by continuous arterial spin labeling (CASL) is made possible by amplitude modulation (AM) of the labeling RF pulse, but perfusion sensitivity is reduced relative to the single‐slice technique. A computer model of the Bloch equations for velocity driven adiabatic fast passage was developed to elucidate the compromised sensitivity to perfusion of the AM control technique for CASL. Calculations were performed over ranges of RF pulse amplitude, B1; magnetic field gradient, G; phase, ϕ, and frequency, f, of the modulation function; velocity, v, and relaxation times, T1 and T2, of blood. It was found that unless f > 2πB1, ϕ determines the performance of the AM control; excessively high B1 or v reduces the efficiency of the AM control; and T1 relaxation dominates if f is too great. In vivo, in rat brain (n = 5) at 2.35 T, the sensitivity of the AM technique to perfusion was 70% of the sensitivity of single‐slice CASL. Magn Reson Med, 2005. © 2005 Wiley‐Liss, Inc. |
| doi_str_mv | 10.1002/mrm.20604 |
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A computer model of the Bloch equations for velocity driven adiabatic fast passage was developed to elucidate the compromised sensitivity to perfusion of the AM control technique for CASL. Calculations were performed over ranges of RF pulse amplitude, B1; magnetic field gradient, G; phase, ϕ, and frequency, f, of the modulation function; velocity, v, and relaxation times, T1 and T2, of blood. It was found that unless f > 2πB1, ϕ determines the performance of the AM control; excessively high B1 or v reduces the efficiency of the AM control; and T1 relaxation dominates if f is too great. In vivo, in rat brain (n = 5) at 2.35 T, the sensitivity of the AM technique to perfusion was 70% of the sensitivity of single‐slice CASL. Magn Reson Med, 2005. © 2005 Wiley‐Liss, Inc.</description><identifier>ISSN: 0740-3194</identifier><identifier>EISSN: 1522-2594</identifier><identifier>DOI: 10.1002/mrm.20604</identifier><identifier>PMID: 16086330</identifier><language>eng</language><publisher>Hoboken: Wiley Subscription Services, Inc., A Wiley Company</publisher><subject>adiabatic fast passage ; Animals ; arterial spin labeling ; Cerebrovascular Circulation - physiology ; Computer Simulation ; Magnetic Resonance Imaging - methods ; Male ; perfusion ; rat brain ; Rats ; Rats, Sprague-Dawley ; Spin Labels</subject><ispartof>Magnetic resonance in medicine, 2005-09, Vol.54 (3), p.594-604</ispartof><rights>Copyright © 2005 Wiley‐Liss, Inc.</rights><rights>Copyright (c) 2005 Wiley-Liss, Inc.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c4274-813f36918f9699a217224fa56fa9dc784d1bf7346d746fdb86e0fa77ce34b3ad3</citedby><cites>FETCH-LOGICAL-c4274-813f36918f9699a217224fa56fa9dc784d1bf7346d746fdb86e0fa77ce34b3ad3</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%2Fmrm.20604$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2Fmrm.20604$$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/16086330$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Utting, Jane F.</creatorcontrib><creatorcontrib>Thomas, David L.</creatorcontrib><creatorcontrib>Gadian, David G.</creatorcontrib><creatorcontrib>Helliar, Robert W.</creatorcontrib><creatorcontrib>Lythgoe, Mark F.</creatorcontrib><creatorcontrib>Ordidge, Roger J.</creatorcontrib><title>Understanding and optimizing the amplitude modulated control for multiple-slice continuous arterial spin labeling</title><title>Magnetic resonance in medicine</title><addtitle>Magn. Reson. Med</addtitle><description>Multiple‐slice perfusion imaging by continuous arterial spin labeling (CASL) is made possible by amplitude modulation (AM) of the labeling RF pulse, but perfusion sensitivity is reduced relative to the single‐slice technique. A computer model of the Bloch equations for velocity driven adiabatic fast passage was developed to elucidate the compromised sensitivity to perfusion of the AM control technique for CASL. Calculations were performed over ranges of RF pulse amplitude, B1; magnetic field gradient, G; phase, ϕ, and frequency, f, of the modulation function; velocity, v, and relaxation times, T1 and T2, of blood. It was found that unless f > 2πB1, ϕ determines the performance of the AM control; excessively high B1 or v reduces the efficiency of the AM control; and T1 relaxation dominates if f is too great. In vivo, in rat brain (n = 5) at 2.35 T, the sensitivity of the AM technique to perfusion was 70% of the sensitivity of single‐slice CASL. Magn Reson Med, 2005. © 2005 Wiley‐Liss, Inc.</description><subject>adiabatic fast passage</subject><subject>Animals</subject><subject>arterial spin labeling</subject><subject>Cerebrovascular Circulation - physiology</subject><subject>Computer Simulation</subject><subject>Magnetic Resonance Imaging - methods</subject><subject>Male</subject><subject>perfusion</subject><subject>rat brain</subject><subject>Rats</subject><subject>Rats, Sprague-Dawley</subject><subject>Spin Labels</subject><issn>0740-3194</issn><issn>1522-2594</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkc1u1TAQRi0EoreFBS-AvEJikdZ_seMlVKUFtSAh2i4tJx6DwU5S2xGUpyftvcAKsRqN5szRaD6EnlFySAlhRymnQ0YkEQ_QhraMNazV4iHaECVIw6kWe2i_lK-EEK2VeIz2qCSd5Jxs0M3l6CCXakcXxs94LXiaa0jh511bvwC2aY6hLg5wmtwSbQWHh2mseYrYTxmnJdYwR2hKDAPcj8K4TEvBNlfIwUZc5jDiaHuIq_QJeuRtLPB0Vw_Q5ZuTT8dnzfmH07fHr86bQTAlmo5yz6WmnddSa8uoYkx420pvtRtUJxztveJCOiWkd30ngXir1ABc9Nw6foBebL1znm4WKNWkUAaI0Y6wXmdk17JOUflfcP0f5YK0K_hyCw55KiWDN3MOyeZbQ4m5C8KsQZj7IFb2-U669AncX3L3-RU42gLfQ4Tbf5vMxceL38pmuxFKhR9_Nmz-ZqTiqjXX70_NO_r66uqaCqP4L4OPo8g</recordid><startdate>200509</startdate><enddate>200509</enddate><creator>Utting, Jane F.</creator><creator>Thomas, David L.</creator><creator>Gadian, David G.</creator><creator>Helliar, Robert W.</creator><creator>Lythgoe, Mark F.</creator><creator>Ordidge, Roger J.</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>7QO</scope><scope>8FD</scope><scope>FR3</scope><scope>P64</scope><scope>7X8</scope></search><sort><creationdate>200509</creationdate><title>Understanding and optimizing the amplitude modulated control for multiple-slice continuous arterial spin labeling</title><author>Utting, Jane F. ; Thomas, David L. ; Gadian, David G. ; Helliar, Robert W. ; Lythgoe, Mark F. ; Ordidge, Roger J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c4274-813f36918f9699a217224fa56fa9dc784d1bf7346d746fdb86e0fa77ce34b3ad3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2005</creationdate><topic>adiabatic fast passage</topic><topic>Animals</topic><topic>arterial spin labeling</topic><topic>Cerebrovascular Circulation - physiology</topic><topic>Computer Simulation</topic><topic>Magnetic Resonance Imaging - methods</topic><topic>Male</topic><topic>perfusion</topic><topic>rat brain</topic><topic>Rats</topic><topic>Rats, Sprague-Dawley</topic><topic>Spin Labels</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Utting, Jane F.</creatorcontrib><creatorcontrib>Thomas, David L.</creatorcontrib><creatorcontrib>Gadian, David G.</creatorcontrib><creatorcontrib>Helliar, Robert W.</creatorcontrib><creatorcontrib>Lythgoe, Mark F.</creatorcontrib><creatorcontrib>Ordidge, Roger J.</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>Biotechnology Research Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>MEDLINE - Academic</collection><jtitle>Magnetic resonance in medicine</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Utting, Jane F.</au><au>Thomas, David L.</au><au>Gadian, David G.</au><au>Helliar, Robert W.</au><au>Lythgoe, Mark F.</au><au>Ordidge, Roger J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Understanding and optimizing the amplitude modulated control for multiple-slice continuous arterial spin labeling</atitle><jtitle>Magnetic resonance in medicine</jtitle><addtitle>Magn. Reson. Med</addtitle><date>2005-09</date><risdate>2005</risdate><volume>54</volume><issue>3</issue><spage>594</spage><epage>604</epage><pages>594-604</pages><issn>0740-3194</issn><eissn>1522-2594</eissn><abstract>Multiple‐slice perfusion imaging by continuous arterial spin labeling (CASL) is made possible by amplitude modulation (AM) of the labeling RF pulse, but perfusion sensitivity is reduced relative to the single‐slice technique. A computer model of the Bloch equations for velocity driven adiabatic fast passage was developed to elucidate the compromised sensitivity to perfusion of the AM control technique for CASL. Calculations were performed over ranges of RF pulse amplitude, B1; magnetic field gradient, G; phase, ϕ, and frequency, f, of the modulation function; velocity, v, and relaxation times, T1 and T2, of blood. 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| subjects | adiabatic fast passage Animals arterial spin labeling Cerebrovascular Circulation - physiology Computer Simulation Magnetic Resonance Imaging - methods Male perfusion rat brain Rats Rats, Sprague-Dawley Spin Labels |
| title | Understanding and optimizing the amplitude modulated control for multiple-slice continuous arterial spin labeling |
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