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<meta name="DC.Title" content="Comparison of Pre- and Postcontrast 3D Time-of-Flight MR Angiography for the Evaluation of Distal Intracranial Branch Occlusions in Acute Ischemic Stroke" />
<meta name="DC.Date" content="2002-04-01" />
<meta name="DC.Publisher" content="American Journal of Neuroradiology" />
<meta name="DC.Rights" content="Copyright © American Society of Neuroradiology" />
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<meta name="DC.Description" content="BACKGROUND AND PURPOSE: Three-dimensional time-of-flight (TOF) MR angiography is used routinely in stroke workup to detect arterial occlusions, but a major drawback is its inadequate depiction of vessels with slow or in-plane flow. We hypothesized that the use of contrast-enhanced MR angiography improves delineation of vessels with diminished or absent flow on precontrast MR angiograms.

METHODS: Pre- and postcontrast 3D TOF MR angiograms were acquired in 55 consecutive patients with acute stroke. Patency of 480 intracranial vessels was assessed on both the pre- and postcontrast angiograms. Diffusion-weighted (DW) and perfusion-weighted (PW) imaging data were also obtained and results correlated with those of pre- and postcontrast MR angiography.

RESULTS: For 50 abnormal vessel segments seen on precontrast MR angiograms, postcontrast MR angiograms resulted in change in the vascular signal intensity in 70% (35 vessel segments); 94% of these changes showed a greater extent of vessel patency. Venous and soft-tissue contrast enhancement had no effect on assessment in 95% of all 480 vessels examined. Interobserver reliability was moderate, with postcontrast interpretation (κ = 0.48) showing a slight improvement over precontrast interpretation (κ = 0.41). Good agreement was found between the TOF results and the pooled DW and PW imaging results.

CONCLUSIONS: Compared with precontrast 3D TOF MR angiograms, postcontrast 3D TOF angiograms improve assessment of intracranial vessel patency in acutely ischemic vascular territories. In some patients, an improved understanding of acute ischemic stroke was obtained by viewing the pre- and postcontrast images. Postcontrast MR angiography should be included in the MR evaluation of acute stroke." />
<meta name="DC.Contributor" content="Janice J. Yang" />
<meta name="DC.Contributor" content="Michael D. Hill" />
<meta name="DC.Contributor" content="William F. Morrish" />
<meta name="DC.Contributor" content="Mark E. Hudon" />
<meta name="DC.Contributor" content="Philip A. Barber" />
<meta name="DC.Contributor" content="Andrew M. Demchuk" />
<meta name="DC.Contributor" content="Robert J. Sevick" />
<meta name="DC.Contributor" content="Richard Frayne" />
<meta name="article:published_time" content="2002-04-01" />
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<meta name="citation_title" content="Comparison of Pre- and Postcontrast 3D Time-of-Flight MR Angiography for the Evaluation of Distal Intracranial Branch Occlusions in Acute Ischemic Stroke" />
<meta name="citation_abstract" lang="en" content="&lt;p&gt;&lt;i&gt;BACKGROUND AND PURPOSE:&lt;/i&gt; Three-dimensional time-of-flight (TOF) MR angiography is used routinely in stroke workup to detect arterial occlusions, but a major drawback is its inadequate depiction of vessels with slow or in-plane flow. We hypothesized that the use of contrast-enhanced MR angiography improves delineation of vessels with diminished or absent flow on precontrast MR angiograms.&lt;/p&gt;&lt;p&gt;&lt;i&gt;METHODS:&lt;/i&gt; Pre- and postcontrast 3D TOF MR angiograms were acquired in 55 consecutive patients with acute stroke. Patency of 480 intracranial vessels was assessed on both the pre- and postcontrast angiograms. Diffusion-weighted (DW) and perfusion-weighted (PW) imaging data were also obtained and results correlated with those of pre- and postcontrast MR angiography.&lt;/p&gt;&lt;p&gt;&lt;i&gt;RESULTS:&lt;/i&gt; For 50 abnormal vessel segments seen on precontrast MR angiograms, postcontrast MR angiograms resulted in change in the vascular signal intensity in 70% (35 vessel segments); 94% of these changes showed a greater extent of vessel patency. Venous and soft-tissue contrast enhancement had no effect on assessment in 95% of all 480 vessels examined. Interobserver reliability was moderate, with postcontrast interpretation (κ = 0.48) showing a slight improvement over precontrast interpretation (κ = 0.41). Good agreement was found between the TOF results and the pooled DW and PW imaging results.&lt;/p&gt;&lt;p&gt;&lt;i&gt;CONCLUSIONS:&lt;/i&gt; Compared with precontrast 3D TOF MR angiograms, postcontrast 3D TOF angiograms improve assessment of intracranial vessel patency in acutely ischemic vascular territories. In some patients, an improved understanding of acute ischemic stroke was obtained by viewing the pre- and postcontrast images. Postcontrast MR angiography should be included in the MR evaluation of acute stroke.&lt;/p&gt;" />
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<meta name="citation_author" content="Janice J. Yang" />
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<meta name="twitter:title" content="Comparison of Pre- and Postcontrast 3D Time-of-Flight MR Angiography for the Evaluation of Distal Intracranial Branch Occlusions in Acute Ischemic Stroke" />
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<meta name="twitter:description" content="BACKGROUND AND PURPOSE: Three-dimensional time-of-flight (TOF) MR angiography is used routinely in stroke workup to detect arterial occlusions, but a major drawback is its inadequate depiction of vessels with slow or in-plane flow. We hypothesized that the use of contrast-enhanced MR angiography improves delineation of vessels with diminished or absent flow on precontrast MR angiograms.

METHODS: Pre- and postcontrast 3D TOF MR angiograms were acquired in 55 consecutive patients with acute stroke. Patency of 480 intracranial vessels was assessed on both the pre- and postcontrast angiograms. Diffusion-weighted (DW) and perfusion-weighted (PW) imaging data were also obtained and results correlated with those of pre- and postcontrast MR angiography.

RESULTS: For 50 abnormal vessel segments seen on precontrast MR angiograms, postcontrast MR angiograms resulted in change in the vascular signal intensity in 70% (35 vessel segments); 94% of these changes showed a greater extent of vessel patency. Venous and soft-tissue contrast enhancement had no effect on assessment in 95% of all 480 vessels examined. Interobserver reliability was moderate, with postcontrast interpretation (κ = 0.48) showing a slight improvement over precontrast interpretation (κ = 0.41). Good agreement was found between the TOF results and the pooled DW and PW imaging results.

CONCLUSIONS: Compared with precontrast 3D TOF MR angiograms, postcontrast 3D TOF angiograms improve assessment of intracranial vessel patency in acutely ischemic vascular territories. In some patients, an improved understanding of acute ischemic stroke was obtained by viewing the pre- and postcontrast images. Postcontrast MR angiography should be included in the MR evaluation of acute stroke." />
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<meta name="og-site-name" property="og:site_name" content="American Journal of Neuroradiology" />
<meta name="og-description" property="og:description" content="BACKGROUND AND PURPOSE: Three-dimensional time-of-flight (TOF) MR angiography is used routinely in stroke workup to detect arterial occlusions, but a major drawback is its inadequate depiction of vessels with slow or in-plane flow. We hypothesized that the use of contrast-enhanced MR angiography improves delineation of vessels with diminished or absent flow on precontrast MR angiograms.

METHODS: Pre- and postcontrast 3D TOF MR angiograms were acquired in 55 consecutive patients with acute stroke. Patency of 480 intracranial vessels was assessed on both the pre- and postcontrast angiograms. Diffusion-weighted (DW) and perfusion-weighted (PW) imaging data were also obtained and results correlated with those of pre- and postcontrast MR angiography.

RESULTS: For 50 abnormal vessel segments seen on precontrast MR angiograms, postcontrast MR angiograms resulted in change in the vascular signal intensity in 70% (35 vessel segments); 94% of these changes showed a greater extent of vessel patency. Venous and soft-tissue contrast enhancement had no effect on assessment in 95% of all 480 vessels examined. Interobserver reliability was moderate, with postcontrast interpretation (κ = 0.48) showing a slight improvement over precontrast interpretation (κ = 0.41). Good agreement was found between the TOF results and the pooled DW and PW imaging results.

CONCLUSIONS: Compared with precontrast 3D TOF MR angiograms, postcontrast 3D TOF angiograms improve assessment of intracranial vessel patency in acutely ischemic vascular territories. In some patients, an improved understanding of acute ischemic stroke was obtained by viewing the pre- and postcontrast images. Postcontrast MR angiography should be included in the MR evaluation of acute stroke." />
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    <title>Comparison of Pre- and Postcontrast 3D Time-of-Flight MR Angiography for the Evaluation of Distal Intracranial Branch Occlusions in Acute Ischemic Stroke | American Journal of Neuroradiology</title>  
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        	<div class="highwire-cite-metadata"><span  class="highwire-cite-metadata-volume highwire-cite-metadata">Vol. 23</span>, <span  class="highwire-cite-metadata-issue highwire-cite-metadata">Issue 4 </span><div  class="highwire-cite-metadata-pubdate highwire-cite-metadata">1 Apr 2002 </div></div>
      
      
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      <div class="highwire-cite-title">Comparison of Pre- and Postcontrast 3D Time-of-Flight MR Angiography for the Evaluation of Distal Intracranial Branch Occlusions in Acute Ischemic Stroke</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">Janice J.</span> <span class="nlm-surname">Yang</span></span>, <span class="highwire-citation-author" data-delta="1"><span class="nlm-given-names">Michael D.</span> <span class="nlm-surname">Hill</span></span>, <span class="highwire-citation-author" data-delta="2"><span class="nlm-given-names">William F.</span> <span class="nlm-surname">Morrish</span></span>, <span class="highwire-citation-author" data-delta="3"><span class="nlm-given-names">Mark E.</span> <span class="nlm-surname">Hudon</span></span>, <span class="highwire-citation-author" data-delta="4"><span class="nlm-given-names">Philip A.</span> <span class="nlm-surname">Barber</span></span>, <span class="highwire-citation-author" data-delta="5"><span class="nlm-given-names">Andrew M.</span> <span class="nlm-surname">Demchuk</span></span>, <span class="highwire-citation-author" data-delta="6"><span class="nlm-given-names">Robert J.</span> <span class="nlm-surname">Sevick</span></span>, <span class="highwire-citation-author" data-delta="7"><span class="nlm-given-names">Richard</span> <span class="nlm-surname">Frayne</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">Apr 2002, </span><span  class="highwire-cite-metadata-volume highwire-cite-metadata">23 </span><span  class="highwire-cite-metadata-issue highwire-cite-metadata">(4) </span><span  class="highwire-cite-metadata-pages highwire-cite-metadata">557-567; </span></div>
  
  
  
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      <div class="highwire-cite-title">Comparison of Pre- and Postcontrast 3D Time-of-Flight MR Angiography for the Evaluation of Distal Intracranial Branch Occlusions in Acute Ischemic Stroke</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">Janice J.</span> <span class="nlm-surname">Yang</span></span>, <span class="highwire-citation-author" data-delta="1"><span class="nlm-given-names">Michael D.</span> <span class="nlm-surname">Hill</span></span>, <span class="highwire-citation-author" data-delta="2"><span class="nlm-given-names">William F.</span> <span class="nlm-surname">Morrish</span></span>, <span class="highwire-citation-author" data-delta="3"><span class="nlm-given-names">Mark E.</span> <span class="nlm-surname">Hudon</span></span>, <span class="highwire-citation-author" data-delta="4"><span class="nlm-given-names">Philip A.</span> <span class="nlm-surname">Barber</span></span>, <span class="highwire-citation-author" data-delta="5"><span class="nlm-given-names">Andrew M.</span> <span class="nlm-surname">Demchuk</span></span>, <span class="highwire-citation-author" data-delta="6"><span class="nlm-given-names">Robert J.</span> <span class="nlm-surname">Sevick</span></span>, <span class="highwire-citation-author" data-delta="7"><span class="nlm-given-names">Richard</span> <span class="nlm-surname">Frayne</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">Apr 2002, </span><span  class="highwire-cite-metadata-volume highwire-cite-metadata">23 </span><span  class="highwire-cite-metadata-issue highwire-cite-metadata">(4) </span><span  class="highwire-cite-metadata-pages highwire-cite-metadata">557-567; </span></div>
  
  
  
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