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<meta name="DC.Title" content="Blinded prospective evaluation of sensitivity of MR angiography to known intracranial aneurysms: importance of aneurysm size." />
<meta name="DC.Date" content="1994-10-01" />
<meta name="DC.Publisher" content="American Journal of Neuroradiology" />
<meta name="DC.Rights" content="Copyright © American Society of Neuroradiology" />
<meta name="DC.AccessRights" content="restricted" />
<meta name="DC.Description" content="PURPOSE To determine the sensitivity of time-of-flight and phase-contrast MR angiography for the detection of intracranial aneurysms.

METHODS Sixteen patients with 27 intracranial aneurysms previously identified with conventional angiography and 19 control patients were examined with three-dimensional time-of-flight, three-dimensional phase-contrast MR angiography, and standard MR imaging. Subvolumes of the carotid and posterior circulations, source images, and standard MR images were blindly interpreted by three experienced neuroradiologists.

RESULTS Detection of an aneurysm by a given sequence was defined as at least two of the three blinded readers identifying the aneurysm. The sensitivities of the sequences based on all 27 aneurysms were: transaxial T1, 25.9%; T2, 48.1%; PC, 44.4%; and TF, 55.6%. Two of 3 aneurysms detected with T2 but not MR angiography had adjacent blood products. Five millimeters appeared to be a critical size; the sensitivities for aneurysms greater than or equal to 5 mm were: T1, 37.5%; T2, 62.5%; PC, 75%; and TF, 87.5%.

CONCLUSIONS Three-dimensional time-of-flight MR with 512 x 256 matrix is more sensitive than three-dimensional phase-contrast or standard MR imaging for detection of aneurysms. Retrospectively, aneurysms 3 mm or larger can be identified with MR angiography; however, prospectively, 5 mm is the critical size for detection." />
<meta name="DC.Contributor" content="J Huston" />
<meta name="DC.Contributor" content="D A Nichols" />
<meta name="DC.Contributor" content="P H Luetmer" />
<meta name="DC.Contributor" content="J T Goodwin" />
<meta name="DC.Contributor" content="F B Meyer" />
<meta name="DC.Contributor" content="D O Wiebers" />
<meta name="DC.Contributor" content="A L Weaver" />
<meta name="article:published_time" content="1994-10-01" />
<meta name="citation_title" content="Blinded prospective evaluation of sensitivity of MR angiography to known intracranial aneurysms: importance of aneurysm size." />
<meta name="citation_abstract" lang="en" content="&lt;h3&gt;PURPOSE&lt;/h3&gt;
&lt;p&gt;To determine the sensitivity of time-of-flight and phase-contrast MR angiography for the detection of intracranial aneurysms.&lt;/p&gt;&lt;h3&gt;METHODS&lt;/h3&gt;
&lt;p&gt;Sixteen patients with 27 intracranial aneurysms previously identified with conventional angiography and 19 control patients were examined with three-dimensional time-of-flight, three-dimensional phase-contrast MR angiography, and standard MR imaging. Subvolumes of the carotid and posterior circulations, source images, and standard MR images were blindly interpreted by three experienced neuroradiologists.&lt;/p&gt;&lt;h3&gt;RESULTS&lt;/h3&gt;
&lt;p&gt;Detection of an aneurysm by a given sequence was defined as at least two of the three blinded readers identifying the aneurysm. The sensitivities of the sequences based on all 27 aneurysms were: transaxial T1, 25.9%; T2, 48.1%; PC, 44.4%; and TF, 55.6%. Two of 3 aneurysms detected with T2 but not MR angiography had adjacent blood products. Five millimeters appeared to be a critical size; the sensitivities for aneurysms greater than or equal to 5 mm were: T1, 37.5%; T2, 62.5%; PC, 75%; and TF, 87.5%.&lt;/p&gt;&lt;h3&gt;CONCLUSIONS&lt;/h3&gt;
&lt;p&gt;Three-dimensional time-of-flight MR with 512 x 256 matrix is more sensitive than three-dimensional phase-contrast or standard MR imaging for detection of aneurysms. Retrospectively, aneurysms 3 mm or larger can be identified with MR angiography; however, prospectively, 5 mm is the critical size for detection.&lt;/p&gt;" />
<meta name="citation_journal_title" content="American Journal of Neuroradiology" />
<meta name="citation_publisher" content="American Journal of Neuroradiology" />
<meta name="citation_publication_date" content="1994/10/01" />
<meta name="citation_mjid" content="ajnr;15/9/1607" />
<meta name="citation_id" content="15/9/1607" />
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<meta name="citation_issn" content="0195-6108" />
<meta name="citation_issn" content="1936-959X" />
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<meta name="citation_volume" content="15" />
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<meta name="citation_article_type" content="Abstract" />
<meta name="citation_firstpage" content="1607" />
<meta name="citation_lastpage" content="1614" />
<meta name="citation_author" content="J Huston" />
<meta name="citation_author_institution" content="Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minn. 55905." />
<meta name="citation_author" content="D A Nichols" />
<meta name="citation_author_institution" content="Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minn. 55905." />
<meta name="citation_author" content="P H Luetmer" />
<meta name="citation_author_institution" content="Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minn. 55905." />
<meta name="citation_author" content="J T Goodwin" />
<meta name="citation_author_institution" content="Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minn. 55905." />
<meta name="citation_author" content="F B Meyer" />
<meta name="citation_author_institution" content="Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minn. 55905." />
<meta name="citation_author" content="D O Wiebers" />
<meta name="citation_author_institution" content="Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minn. 55905." />
<meta name="citation_author" content="A L Weaver" />
<meta name="citation_author_institution" content="Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minn. 55905." />
<meta name="twitter:title" content="Blinded prospective evaluation of sensitivity of MR angiography to known intracranial aneurysms: importance of aneurysm size." />
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<meta name="twitter:description" content="PURPOSE To determine the sensitivity of time-of-flight and phase-contrast MR angiography for the detection of intracranial aneurysms.

METHODS Sixteen patients with 27 intracranial aneurysms previously identified with conventional angiography and 19 control patients were examined with three-dimensional time-of-flight, three-dimensional phase-contrast MR angiography, and standard MR imaging. Subvolumes of the carotid and posterior circulations, source images, and standard MR images were blindly interpreted by three experienced neuroradiologists.

RESULTS Detection of an aneurysm by a given sequence was defined as at least two of the three blinded readers identifying the aneurysm. The sensitivities of the sequences based on all 27 aneurysms were: transaxial T1, 25.9%; T2, 48.1%; PC, 44.4%; and TF, 55.6%. Two of 3 aneurysms detected with T2 but not MR angiography had adjacent blood products. Five millimeters appeared to be a critical size; the sensitivities for aneurysms greater than or equal to 5 mm were: T1, 37.5%; T2, 62.5%; PC, 75%; and TF, 87.5%.

CONCLUSIONS Three-dimensional time-of-flight MR with 512 x 256 matrix is more sensitive than three-dimensional phase-contrast or standard MR imaging for detection of aneurysms. Retrospectively, aneurysms 3 mm or larger can be identified with MR angiography; however, prospectively, 5 mm is the critical size for detection." />
<meta name="og-title" property="og:title" content="Blinded prospective evaluation of sensitivity of MR angiography to known intracranial aneurysms: importance of aneurysm size." />
<meta name="og-url" property="og:url" content="http://ajnr-stage2.stage.highwire.org/content/15/9/1607" />
<meta name="og-site-name" property="og:site_name" content="American Journal of Neuroradiology" />
<meta name="og-description" property="og:description" content="PURPOSE To determine the sensitivity of time-of-flight and phase-contrast MR angiography for the detection of intracranial aneurysms.

METHODS Sixteen patients with 27 intracranial aneurysms previously identified with conventional angiography and 19 control patients were examined with three-dimensional time-of-flight, three-dimensional phase-contrast MR angiography, and standard MR imaging. Subvolumes of the carotid and posterior circulations, source images, and standard MR images were blindly interpreted by three experienced neuroradiologists.

RESULTS Detection of an aneurysm by a given sequence was defined as at least two of the three blinded readers identifying the aneurysm. The sensitivities of the sequences based on all 27 aneurysms were: transaxial T1, 25.9%; T2, 48.1%; PC, 44.4%; and TF, 55.6%. Two of 3 aneurysms detected with T2 but not MR angiography had adjacent blood products. Five millimeters appeared to be a critical size; the sensitivities for aneurysms greater than or equal to 5 mm were: T1, 37.5%; T2, 62.5%; PC, 75%; and TF, 87.5%.

CONCLUSIONS Three-dimensional time-of-flight MR with 512 x 256 matrix is more sensitive than three-dimensional phase-contrast or standard MR imaging for detection of aneurysms. Retrospectively, aneurysms 3 mm or larger can be identified with MR angiography; however, prospectively, 5 mm is the critical size for detection." />
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      <h1 class="highwire-cite-title" id="page-title">Blinded prospective evaluation of sensitivity of MR angiography to known intracranial aneurysms: importance of aneurysm size.</h1>  
    	<div class="highwire-cite-authors"><span  class="highwire-citation-authors"><span class="highwire-citation-author first" data-delta="0">J Huston</span>, <span class="highwire-citation-author" data-delta="1">D A Nichols</span>, <span class="highwire-citation-author" data-delta="2">P H Luetmer</span>, <span class="highwire-citation-author" data-delta="3">J T Goodwin</span>, <span class="highwire-citation-author" data-delta="4">F B Meyer</span>, <span class="highwire-citation-author" data-delta="5">D O Wiebers</span> and <span class="highwire-citation-author" data-delta="6">A L Weaver</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 1994,  </span><span  class="highwire-cite-metadata-volume highwire-cite-metadata">15 </span><span  class="highwire-cite-metadata-issue highwire-cite-metadata">(9) </span><span  class="highwire-cite-metadata-pages highwire-cite-metadata">1607-1614; </span></div>
  
  
  
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<div id="hw-article-author-popups-top-node-6173--6482663855" style="display: none;"><div class="author-tooltip-0"><div class="author-tooltip-name">J Huston <span class="nlm-suffix">3rd</span></div><div class="author-tooltip-affiliation"><span class="author-tooltip-text"><div class='author-affiliation'>Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minn. 55905.</div></span></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=J%2BHuston%2B%3Cspan%2Bclass%3D%22nlm-suffix%22%3E3rd%3C/span%3E" 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=Huston%20J&amp;link_type=AUTHORSEARCH" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on PubMed</a></li><li 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          <p id="p-2"><strong>METHODS</strong> Sixteen patients with 27 intracranial aneurysms previously identified with conventional angiography and 19 control patients were examined with three-dimensional time-of-flight, three-dimensional phase-contrast MR angiography, and standard MR imaging. Subvolumes of the carotid and posterior circulations, source images, and standard MR images were blindly interpreted by three experienced neuroradiologists.</p>
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          <p id="p-3"><strong>RESULTS</strong> Detection of an aneurysm by a given sequence was defined as at least two of the three blinded readers identifying the aneurysm. The sensitivities of the sequences based on all 27 aneurysms were: transaxial T1, 25.9%; T2, 48.1%; PC, 44.4%; and TF, 55.6%. Two of 3 aneurysms detected with T2 but not MR angiography had adjacent blood products. Five millimeters appeared to be a critical size; the sensitivities for aneurysms greater than or equal to 5 mm were: T1, 37.5%; T2, 62.5%; PC, 75%; and TF, 87.5%.</p>
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          <p id="p-4"><strong>CONCLUSIONS</strong> Three-dimensional time-of-flight MR with 512 x 256 matrix is more sensitive than three-dimensional phase-contrast or standard MR imaging for detection of aneurysms. Retrospectively, aneurysms 3 mm or larger can be identified with MR angiography; however, prospectively, 5 mm is the critical size for detection.</p>
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        	<div class="highwire-cite-metadata"><span  class="highwire-cite-metadata-volume highwire-cite-metadata">Vol. 15</span>, <span  class="highwire-cite-metadata-issue highwire-cite-metadata">Issue 9 </span><div  class="highwire-cite-metadata-pubdate highwire-cite-metadata">1 Oct 1994 </div></div>
      
      
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