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<meta name="DC.Title" content="Postoperative Assessment of Extracranial–Intracranial Bypass by Time-Resolved 3D Contrast-Enhanced MR Angiography Using Parallel Imaging" />
<meta name="DC.Date" content="2005-10-01" />
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<meta name="DC.Description" content="PURPOSE: Our goals were to assess image quality of time-resolved contrast-enhanced MR angiography (CE MRA), by using 3D data acquisition along with a parallel imaging technique that can improve temporal resolution and to compare this technique with 3D-time-of-flight (TOF) MRA in the postoperative assessment of extracranial (EC)–intracranial (IC) bypass surgery.

METHODS: On a 1.5T imaging system, we performed CE MRA by using a 3D fast field-echo sequence in combination with a parallel imaging technique, to obtain images in the coronal plane centered at the postoperative site. Our patient group comprised 17 patients, including 13 after superficial temporal artery–middle cerebral artery (MCA) anastomosis, 3 after external carotid artery-MCA anastomosis, and one after extracranial vertebral artery–posterior cerebral artery anastomosis. Visualization of the anastomosis and the distal flow on the CE-MRA images was assessed comparatively with that on 3D-TOF MR angiograms obtained at the same time. In 6 patients, we also compared the efficiency of visualization on CE-MRA images with that on conventional angiograms.

RESULTS: A temporal resolution of 0.8 s/frame could be achieved with the technique employed. The bypass was better demonstrated postoperatively on CE-MRA images than on 3D-TOF MR angiograms in 13 patients (76%), whereas the 2 methods were equivalent in 4 patients (24%). Good correspondence of results was observed in the 6 patients for whom CE MRA and conventional digital subtraction angiography (DSA) images were compared.

CONCLUSION: CE MRA by using the parallel imaging technique can increase image acquisition speed with sufficient image quality. This technique is at least equivalent to 3D-TOF MRA to evaluate the postoperative status of EC-IC bypass." />
<meta name="DC.Contributor" content="Kazuhiro Tsuchiya" />
<meta name="DC.Contributor" content="Keita Honya" />
<meta name="DC.Contributor" content="Akira Fujikawa" />
<meta name="DC.Contributor" content="Hidekatsu Tateishi" />
<meta name="DC.Contributor" content="Yoshiaki Shiokawa" />
<meta name="article:published_time" content="2005-10-01" />
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<meta name="citation_title" content="Postoperative Assessment of Extracranial–Intracranial Bypass by Time-Resolved 3D Contrast-Enhanced MR Angiography Using Parallel Imaging" />
<meta name="citation_abstract" lang="en" content="&lt;p&gt;&lt;b&gt;PURPOSE:&lt;/b&gt; Our goals were to assess image quality of time-resolved contrast-enhanced MR angiography (CE MRA), by using 3D data acquisition along with a parallel imaging technique that can improve temporal resolution and to compare this technique with 3D-time-of-flight (TOF) MRA in the postoperative assessment of extracranial (EC)–intracranial (IC) bypass surgery.&lt;/p&gt;&lt;p&gt;&lt;b&gt;METHODS:&lt;/b&gt; On a 1.5T imaging system, we performed CE MRA by using a 3D fast field-echo sequence in combination with a parallel imaging technique, to obtain images in the coronal plane centered at the postoperative site. Our patient group comprised 17 patients, including 13 after superficial temporal artery–middle cerebral artery (MCA) anastomosis, 3 after external carotid artery-MCA anastomosis, and one after extracranial vertebral artery–posterior cerebral artery anastomosis. Visualization of the anastomosis and the distal flow on the CE-MRA images was assessed comparatively with that on 3D-TOF MR angiograms obtained at the same time. In 6 patients, we also compared the efficiency of visualization on CE-MRA images with that on conventional angiograms.&lt;/p&gt;&lt;p&gt;&lt;b&gt;RESULTS:&lt;/b&gt; A temporal resolution of 0.8 s/frame could be achieved with the technique employed. The bypass was better demonstrated postoperatively on CE-MRA images than on 3D-TOF MR angiograms in 13 patients (76%), whereas the 2 methods were equivalent in 4 patients (24%). Good correspondence of results was observed in the 6 patients for whom CE MRA and conventional digital subtraction angiography (DSA) images were compared.&lt;/p&gt;&lt;p&gt;&lt;b&gt;CONCLUSION:&lt;/b&gt; CE MRA by using the parallel imaging technique can increase image acquisition speed with sufficient image quality. This technique is at least equivalent to 3D-TOF MRA to evaluate the postoperative status of EC-IC bypass.&lt;/p&gt;" />
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METHODS: On a 1.5T imaging system, we performed CE MRA by using a 3D fast field-echo sequence in combination with a parallel imaging technique, to obtain images in the coronal plane centered at the postoperative site. Our patient group comprised 17 patients, including 13 after superficial temporal artery–middle cerebral artery (MCA) anastomosis, 3 after external carotid artery-MCA anastomosis, and one after extracranial vertebral artery–posterior cerebral artery anastomosis. Visualization of the anastomosis and the distal flow on the CE-MRA images was assessed comparatively with that on 3D-TOF MR angiograms obtained at the same time. In 6 patients, we also compared the efficiency of visualization on CE-MRA images with that on conventional angiograms.

RESULTS: A temporal resolution of 0.8 s/frame could be achieved with the technique employed. The bypass was better demonstrated postoperatively on CE-MRA images than on 3D-TOF MR angiograms in 13 patients (76%), whereas the 2 methods were equivalent in 4 patients (24%). Good correspondence of results was observed in the 6 patients for whom CE MRA and conventional digital subtraction angiography (DSA) images were compared.

CONCLUSION: CE MRA by using the parallel imaging technique can increase image acquisition speed with sufficient image quality. This technique is at least equivalent to 3D-TOF MRA to evaluate the postoperative status of EC-IC bypass." />
<meta name="og-title" property="og:title" content="Postoperative Assessment of Extracranial–Intracranial Bypass by Time-Resolved 3D Contrast-Enhanced MR Angiography Using Parallel Imaging" />
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<meta name="og-description" property="og:description" content="PURPOSE: Our goals were to assess image quality of time-resolved contrast-enhanced MR angiography (CE MRA), by using 3D data acquisition along with a parallel imaging technique that can improve temporal resolution and to compare this technique with 3D-time-of-flight (TOF) MRA in the postoperative assessment of extracranial (EC)–intracranial (IC) bypass surgery.

METHODS: On a 1.5T imaging system, we performed CE MRA by using a 3D fast field-echo sequence in combination with a parallel imaging technique, to obtain images in the coronal plane centered at the postoperative site. Our patient group comprised 17 patients, including 13 after superficial temporal artery–middle cerebral artery (MCA) anastomosis, 3 after external carotid artery-MCA anastomosis, and one after extracranial vertebral artery–posterior cerebral artery anastomosis. Visualization of the anastomosis and the distal flow on the CE-MRA images was assessed comparatively with that on 3D-TOF MR angiograms obtained at the same time. In 6 patients, we also compared the efficiency of visualization on CE-MRA images with that on conventional angiograms.

RESULTS: A temporal resolution of 0.8 s/frame could be achieved with the technique employed. The bypass was better demonstrated postoperatively on CE-MRA images than on 3D-TOF MR angiograms in 13 patients (76%), whereas the 2 methods were equivalent in 4 patients (24%). Good correspondence of results was observed in the 6 patients for whom CE MRA and conventional digital subtraction angiography (DSA) images were compared.

CONCLUSION: CE MRA by using the parallel imaging technique can increase image acquisition speed with sufficient image quality. This technique is at least equivalent to 3D-TOF MRA to evaluate the postoperative status of EC-IC bypass." />
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    <div class="highwire-article-citation highwire-citation-type-highwire-article node3274--5" data-node-nid="3274" id="top-node-3274--61433726579" data-pisa="ajnr;26/9/2243" data-pisa-master="ajnr;26/9/2243" data-apath="/ajnr/26/9/2243.atom" data-hw-author-tooltip-instance="highwire_author_tooltip"><div class="highwire-cite highwire-cite-highwire-article highwire-citation-jcore-article-title-complete clearfix has-author-tooltip highwire-citation-highwire-article-top-a">
  
  
      <div class="highwire-cite-overline"><span  class="highwire-cite-metadata-article-type highwire-cite-metadata">Research Article</span><span class="separator-pipe"></span><span  class="highwire-cite-metadata-art-cat highwire-cite-metadata"><span class="wrapper">BRAIN</span></span></div>
  
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      <h1 class="highwire-cite-title" id="page-title">Postoperative Assessment of Extracranial–Intracranial Bypass by Time-Resolved 3D Contrast-Enhanced MR Angiography Using Parallel Imaging</h1>  
    	<div class="highwire-cite-authors"><span  class="highwire-citation-authors"><span class="highwire-citation-author first" data-delta="0">Kazuhiro Tsuchiya</span>, <span class="highwire-citation-author" data-delta="1">Keita Honya</span>, <span class="highwire-citation-author" data-delta="2">Akira Fujikawa</span>, <span class="highwire-citation-author" data-delta="3">Hidekatsu Tateishi</span> and <span class="highwire-citation-author" data-delta="4">Yoshiaki Shiokawa</span></span></div>
  
    	<div class="highwire-cite-metadata"><span  class="highwire-cite-metadata-journal highwire-cite-metadata">American Journal of Neuroradiology </span><span  class="highwire-cite-metadata-date highwire-cite-metadata">October 2005,  </span><span  class="highwire-cite-metadata-volume highwire-cite-metadata">26 </span><span  class="highwire-cite-metadata-issue highwire-cite-metadata">(9) </span><span  class="highwire-cite-metadata-pages highwire-cite-metadata">2243-2247; </span></div>
  
  
  
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<div id="hw-article-author-popups-top-node-3274--61433726579" style="display: none;"><div class="author-tooltip-0"><div class="author-tooltip-name">Kazuhiro Tsuchiya </div><ul class="author-tooltip-find-more"><li class="author-tooltip-gs-link first"><a href="/lookup/google-scholar?link_type=googlescholar&amp;gs_type=author&amp;author%5B0%5D=Kazuhiro%2BTsuchiya%2B" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on Google Scholar</a></li><li class="author-tooltip-pubmed-link"><a href="/lookup/external-ref?access_num=Tsuchiya%20K&amp;link_type=AUTHORSEARCH" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on PubMed</a></li><li class="author-site-search-link last"><a href="/search/author1%3AKazuhiro%2BTsuchiya%2B" rel="nofollow" class="" data-icon-position="" data-hide-link-title="0">Search for this author on this site</a></li></ul></div><div class="author-tooltip-1"><div class="author-tooltip-name">Keita Honya </div><ul class="author-tooltip-find-more"><li class="author-tooltip-gs-link first"><a href="/lookup/google-scholar?link_type=googlescholar&amp;gs_type=author&amp;author%5B0%5D=Keita%2BHonya%2B" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on Google Scholar</a></li><li class="author-tooltip-pubmed-link"><a href="/lookup/external-ref?access_num=Honya%20K&amp;link_type=AUTHORSEARCH" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on PubMed</a></li><li class="author-site-search-link last"><a href="/search/author1%3AKeita%2BHonya%2B" rel="nofollow" class="" data-icon-position="" data-hide-link-title="0">Search for this author on this site</a></li></ul></div><div class="author-tooltip-2"><div class="author-tooltip-name">Akira Fujikawa </div><ul class="author-tooltip-find-more"><li class="author-tooltip-gs-link first"><a href="/lookup/google-scholar?link_type=googlescholar&amp;gs_type=author&amp;author%5B0%5D=Akira%2BFujikawa%2B" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on Google Scholar</a></li><li class="author-tooltip-pubmed-link"><a href="/lookup/external-ref?access_num=Fujikawa%20A&amp;link_type=AUTHORSEARCH" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on PubMed</a></li><li class="author-site-search-link last"><a href="/search/author1%3AAkira%2BFujikawa%2B" rel="nofollow" class="" data-icon-position="" data-hide-link-title="0">Search for this author on this site</a></li></ul></div><div class="author-tooltip-3"><div class="author-tooltip-name">Hidekatsu Tateishi </div><ul class="author-tooltip-find-more"><li class="author-tooltip-gs-link first"><a href="/lookup/google-scholar?link_type=googlescholar&amp;gs_type=author&amp;author%5B0%5D=Hidekatsu%2BTateishi%2B" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on Google Scholar</a></li><li class="author-tooltip-pubmed-link"><a href="/lookup/external-ref?access_num=Tateishi%20H&amp;link_type=AUTHORSEARCH" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on PubMed</a></li><li class="author-site-search-link last"><a href="/search/author1%3AHidekatsu%2BTateishi%2B" rel="nofollow" class="" data-icon-position="" data-hide-link-title="0">Search for this author on this site</a></li></ul></div><div class="author-tooltip-4"><div class="author-tooltip-name">Yoshiaki Shiokawa </div><ul class="author-tooltip-find-more"><li class="author-tooltip-gs-link first"><a href="/lookup/google-scholar?link_type=googlescholar&amp;gs_type=author&amp;author%5B0%5D=Yoshiaki%2BShiokawa%2B" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on Google Scholar</a></li><li class="author-tooltip-pubmed-link"><a href="/lookup/external-ref?access_num=Shiokawa%20Y&amp;link_type=AUTHORSEARCH" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on PubMed</a></li><li class="author-site-search-link last"><a href="/search/author1%3AYoshiaki%2BShiokawa%2B" rel="nofollow" class="" data-icon-position="" data-hide-link-title="0">Search for this author on this site</a></li></ul></div></div></div>  </div>

  
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    <div class="highwire-markup"><div xmlns="http://www.w3.org/1999/xhtml" xmlns:xhtml="http://www.w3.org/1999/xhtml" class="section ref-list" id="ref-list-1"><h2>References</h2><ol class="cit-list"><li><a class="rev-xref-ref" href="#xref-ref-1-1" title="View reference 1 in text" id="ref-1">↵</a><div class="cit ref-cit ref-other" id="cit-26.9.2243.1" data-doi="10.1056/NEJM198511073131904"><div class="cit-metadata"><cite>EC-IC Bypass Study Group. <strong>Failure of extracranial-intracranial arterial bypass to reduce the risk of ischemic stroke: results of an international randomized trial.</strong> <span class="cit-source">N Engl J Med</span> <span class="cit-pub-date">1985</span>;<span class="cit-vol">313</span>:<span class="cit-fpage">1191</span>–1200</cite></div><div class="cit-extra"><a href="/lookup/external-ref?access_num=10.1056/NEJM198511073131904&amp;link_type=DOI" class="cit-ref-sprinkles cit-ref-sprinkles-doi cit-ref-sprinkles-crossref"><span>CrossRef</span></a><a 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<span class="cit-source">AJR Am J Roentgenol</span> <span class="cit-pub-date">2000</span>;<span class="cit-vol">174</span>:<span class="cit-fpage">1293</span>–1295</cite></div><div class="cit-extra"><a href="/lookup/external-ref?access_num=10789780&amp;link_type=MED&amp;atom=%2Fajnr%2F26%2F9%2F2243.atom" class="cit-ref-sprinkles cit-ref-sprinkles-medline"><span>PubMed</span></a></div></div></li><li><div class="cit ref-cit ref-other no-rev-xref" id="cit-26.9.2243.13"><div class="cit-metadata"><cite>Griffiths PD, Hoggard N, Warren DJ, et al. <strong>Brain arteriovenous malformations: assessment with dynamic MR digital subtraction angiography.</strong> <span class="cit-source">AJNR Am J Neuroradiol</span> <span class="cit-pub-date">2000</span>;<span class="cit-vol">21</span>:<span class="cit-fpage">1892</span>–1899</cite></div><div class="cit-extra"><a 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class="cit-source">Eur Radiol</span> <span class="cit-pub-date">2000</span>;<span class="cit-vol">10</span>:<span class="cit-fpage">736</span>–744</cite></div><div class="cit-extra"><a href="/lookup/external-ref?access_num=10.1007/s003300050996&amp;link_type=DOI" class="cit-ref-sprinkles cit-ref-sprinkles-doi cit-ref-sprinkles-crossref"><span>CrossRef</span></a><a href="/lookup/external-ref?access_num=10823625&amp;link_type=MED&amp;atom=%2Fajnr%2F26%2F9%2F2243.atom" class="cit-ref-sprinkles cit-ref-sprinkles-medline"><span>PubMed</span></a></div></div></li><li><a class="rev-xref-ref" href="#xref-ref-15-1" title="View reference 15 in text" id="ref-15">↵</a><div class="cit ref-cit ref-other" id="cit-26.9.2243.15"><div class="cit-metadata"><cite>Tsuchiya K, Aoki C, Katase S, Hachiya J <strong>MR digital subtraction angiography with three-dimensional data acquisition in the diagnosis of brain tumors: preliminary experience.</strong> <span class="cit-source">Magn Reson Imaging</span> <span 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        	<div class="highwire-cite-metadata"><span  class="highwire-cite-metadata-volume highwire-cite-metadata">Vol. 26</span>, <span  class="highwire-cite-metadata-issue highwire-cite-metadata">Issue 9 </span><div  class="highwire-cite-metadata-pubdate highwire-cite-metadata">1 Oct 2005 </div></div>
      
      
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      <div class="highwire-cite-title">Postoperative Assessment of Extracranial–Intracranial Bypass by Time-Resolved 3D Contrast-Enhanced MR Angiography Using Parallel Imaging</div>  
    	<div class="highwire-cite-authors"><span  class="highwire-citation-authors"><span class="highwire-citation-author first" data-delta="0"><span class="nlm-given-names">Kazuhiro</span> <span class="nlm-surname">Tsuchiya</span></span>, <span class="highwire-citation-author" data-delta="1"><span class="nlm-given-names">Keita</span> <span class="nlm-surname">Honya</span></span>, <span class="highwire-citation-author" data-delta="2"><span class="nlm-given-names">Akira</span> <span class="nlm-surname">Fujikawa</span></span>, <span class="highwire-citation-author" data-delta="3"><span class="nlm-given-names">Hidekatsu</span> <span class="nlm-surname">Tateishi</span></span>, <span class="highwire-citation-author" data-delta="4"><span class="nlm-given-names">Yoshiaki</span> <span class="nlm-surname">Shiokawa</span></span></span></div>
  
    	<div class="highwire-cite-metadata"><span  class="highwire-cite-metadata-journal highwire-cite-metadata">American Journal of Neuroradiology </span><span  class="highwire-cite-metadata-date highwire-cite-metadata">Oct 2005, </span><span  class="highwire-cite-metadata-volume highwire-cite-metadata">26 </span><span  class="highwire-cite-metadata-issue highwire-cite-metadata">(9) </span><span  class="highwire-cite-metadata-pages highwire-cite-metadata">2243-2247; </span></div>
  
  
  
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      <div class="highwire-cite-title">Postoperative Assessment of Extracranial–Intracranial Bypass by Time-Resolved 3D Contrast-Enhanced MR Angiography Using Parallel Imaging</div>  
    	<div class="highwire-cite-authors"><span  class="highwire-citation-authors"><span class="highwire-citation-author first" data-delta="0"><span class="nlm-given-names">Kazuhiro</span> <span class="nlm-surname">Tsuchiya</span></span>, <span class="highwire-citation-author" data-delta="1"><span class="nlm-given-names">Keita</span> <span class="nlm-surname">Honya</span></span>, <span class="highwire-citation-author" data-delta="2"><span class="nlm-given-names">Akira</span> <span class="nlm-surname">Fujikawa</span></span>, <span class="highwire-citation-author" data-delta="3"><span class="nlm-given-names">Hidekatsu</span> <span class="nlm-surname">Tateishi</span></span>, <span class="highwire-citation-author" data-delta="4"><span class="nlm-given-names">Yoshiaki</span> <span class="nlm-surname">Shiokawa</span></span></span></div>
  
    	<div class="highwire-cite-metadata"><span  class="highwire-cite-metadata-journal highwire-cite-metadata">American Journal of Neuroradiology </span><span  class="highwire-cite-metadata-date highwire-cite-metadata">Oct 2005, </span><span  class="highwire-cite-metadata-volume highwire-cite-metadata">26 </span><span  class="highwire-cite-metadata-issue highwire-cite-metadata">(9) </span><span  class="highwire-cite-metadata-pages highwire-cite-metadata">2243-2247; </span></div>
  
  
  
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