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<meta name="DC.Title" content="Fast Whole-Brain 4D Contrast-Enhanced MR Angiography with Velocity Encoding Using Undersampled Radial Acquisition and Highly Constrained Projection Reconstruction: Image-Quality Assessment in Volunteer Subjects" />
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<meta name="DC.Date" content="2011-03-01" />
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Indicates open access to non-subscribers at www.ajnr.org" />
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<meta name="DC.Description" content="SUMMARY: We report on the image quality obtained by using fast contrast-enhanced whole-brain 4D radial MRA with 0.75-second temporal resolution, isotropic submillimeter spatial resolution, and velocity encoding (HYPRFlow). Images generated by HYPR-LR by using the velocity-encoded data as the constraining image were of diagnostic quality. In addition, we demonstrate that measurements of shear stress within the middle cerebral artery can be derived from the high-resolution 3D velocity data.

AV
:   arteriovenous
CE-VIPR
:   contrast-enhanced VIPR
HYPR
:   highly constrained back-projection
HYPRFlow
:   HYPR with phase contrast as constraint
HYPR-LR
:   HYPR local reconstruction
MCA
:   middle cerebral artery
MIP
:   maximum intensity projection
MRA
:   MR angiography
PC-VIPR
:   phase-contrast VIPR
SNR
:   signal intensity–to-noise ratio
VIPR
:   vastly undersampled isotropic projection reconstruction
WSS
:   wall shear stress" />
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&lt;p&gt;We report on the image quality obtained by using fast contrast-enhanced whole-brain 4D radial MRA with 0.75-second temporal resolution, isotropic submillimeter spatial resolution, and velocity encoding (HYPRFlow). Images generated by HYPR-LR by using the velocity-encoded data as the constraining image were of diagnostic quality. In addition, we demonstrate that measurements of shear stress within the middle cerebral artery can be derived from the high-resolution 3D velocity data.&lt;/p&gt;" />
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<meta name="twitter:title" content="Fast Whole-Brain 4D Contrast-Enhanced MR Angiography with Velocity Encoding Using Undersampled Radial Acquisition and Highly Constrained Projection Reconstruction: Image-Quality Assessment in Volunteer Subjects" />
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<meta name="twitter:description" content="SUMMARY: We report on the image quality obtained by using fast contrast-enhanced whole-brain 4D radial MRA with 0.75-second temporal resolution, isotropic submillimeter spatial resolution, and velocity encoding (HYPRFlow). Images generated by HYPR-LR by using the velocity-encoded data as the constraining image were of diagnostic quality. In addition, we demonstrate that measurements of shear stress within the middle cerebral artery can be derived from the high-resolution 3D velocity data.

AV
:   arteriovenous
CE-VIPR
:   contrast-enhanced VIPR
HYPR
:   highly constrained back-projection
HYPRFlow
:   HYPR with phase contrast as constraint
HYPR-LR
:   HYPR local reconstruction
MCA
:   middle cerebral artery
MIP
:   maximum intensity projection
MRA
:   MR angiography
PC-VIPR
:   phase-contrast VIPR
SNR
:   signal intensity–to-noise ratio
VIPR
:   vastly undersampled isotropic projection reconstruction
WSS
:   wall shear stress" />
<meta name="og-title" property="og:title" content="Fast Whole-Brain 4D Contrast-Enhanced MR Angiography with Velocity Encoding Using Undersampled Radial Acquisition and Highly Constrained Projection Reconstruction: Image-Quality Assessment in Volunteer Subjects" />
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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="SUMMARY: We report on the image quality obtained by using fast contrast-enhanced whole-brain 4D radial MRA with 0.75-second temporal resolution, isotropic submillimeter spatial resolution, and velocity encoding (HYPRFlow). Images generated by HYPR-LR by using the velocity-encoded data as the constraining image were of diagnostic quality. In addition, we demonstrate that measurements of shear stress within the middle cerebral artery can be derived from the high-resolution 3D velocity data.

AV
:   arteriovenous
CE-VIPR
:   contrast-enhanced VIPR
HYPR
:   highly constrained back-projection
HYPRFlow
:   HYPR with phase contrast as constraint
HYPR-LR
:   HYPR local reconstruction
MCA
:   middle cerebral artery
MIP
:   maximum intensity projection
MRA
:   MR angiography
PC-VIPR
:   phase-contrast VIPR
SNR
:   signal intensity–to-noise ratio
VIPR
:   vastly undersampled isotropic projection reconstruction
WSS
:   wall shear stress" />
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    <title>Fast Whole-Brain 4D Contrast-Enhanced MR Angiography with Velocity Encoding Using Undersampled Radial Acquisition and Highly Constrained Projection Reconstruction: Image-Quality Assessment in Volunteer Subjects | American Journal of Neuroradiology</title>  
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    <div class="highwire-article-citation highwire-citation-type-highwire-article node9384--5" data-node-nid="9384" id="top-node-9384--6175376788" data-pisa="ajnr;32/3/E47" data-pisa-master="ajnr;ajnr.A2048" data-apath="/ajnr/32/3/E47.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">
  
  
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      <h1 class="highwire-cite-title" id="page-title">Fast Whole-Brain 4D Contrast-Enhanced MR Angiography with Velocity Encoding Using Undersampled Radial Acquisition and Highly Constrained Projection Reconstruction: Image-Quality Assessment in Volunteer Subjects</h1>  
    	<div class="highwire-cite-authors"><span  class="highwire-citation-authors"><span class="highwire-citation-author first" data-delta="0">Y. Wu</span>, <span class="highwire-citation-author" data-delta="1">W. Chang</span>, <span class="highwire-citation-author" data-delta="2">K.M. Johnson</span>, <span class="highwire-citation-author" data-delta="3">J. Velikina</span>, <span class="highwire-citation-author" data-delta="4">H. Rowley</span>, <span class="highwire-citation-author" data-delta="5">C. Mistretta</span> and <span class="highwire-citation-author" data-delta="6">P. Turski</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">March 2011,  </span><span  class="highwire-cite-metadata-volume highwire-cite-metadata">32 </span><span  class="highwire-cite-metadata-issue highwire-cite-metadata">(3) </span><span  class="highwire-cite-metadata-pages highwire-cite-metadata">E47-E50; </span><span  class="highwire-cite-metadata-doi highwire-cite-metadata">DOI: https://doi.org/10.3174/ajnr.A2048 </span></div>
  
  
  
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<p id="p-2"><strong>SUMMARY:</strong> We report on the image quality obtained by using fast contrast-enhanced whole-brain 4D radial MRA with 0.75-second temporal resolution, isotropic submillimeter spatial resolution, and velocity encoding (HYPRFlow). Images generated by HYPR-LR by using the velocity-encoded data as the constraining image were of diagnostic quality. In addition, we demonstrate that measurements of shear stress within the middle cerebral artery can be derived from the high-resolution 3D velocity data.</p>
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</div><div class="section glossary" id="glossary-1"><h2>Abbreviations</h2><dl id="def-list-1"><dt id="def-item-1">AV<span class="def-item-dt-sep"></span></dt><dd>arteriovenous<span class="def-item-dd-sep"></span></dd><dt id="def-item-2">CE-VIPR<span class="def-item-dt-sep"></span></dt><dd>contrast-enhanced VIPR<span class="def-item-dd-sep"></span></dd><dt id="def-item-3">HYPR<span class="def-item-dt-sep"></span></dt><dd>highly constrained back-projection<span class="def-item-dd-sep"></span></dd><dt id="def-item-4">HYPRFlow<span class="def-item-dt-sep"></span></dt><dd>HYPR with phase contrast as constraint<span class="def-item-dd-sep"></span></dd><dt id="def-item-5">HYPR-LR<span class="def-item-dt-sep"></span></dt><dd>HYPR local reconstruction<span class="def-item-dd-sep"></span></dd><dt id="def-item-6">MCA<span class="def-item-dt-sep"></span></dt><dd>middle cerebral artery<span class="def-item-dd-sep"></span></dd><dt id="def-item-7">MIP<span class="def-item-dt-sep"></span></dt><dd>maximum intensity projection<span class="def-item-dd-sep"></span></dd><dt id="def-item-8">MRA<span class="def-item-dt-sep"></span></dt><dd>MR angiography<span class="def-item-dd-sep"></span></dd><dt id="def-item-9">PC-VIPR<span class="def-item-dt-sep"></span></dt><dd>phase-contrast VIPR<span class="def-item-dd-sep"></span></dd><dt id="def-item-10">SNR<span class="def-item-dt-sep"></span></dt><dd>signal intensity–to-noise ratio<span class="def-item-dd-sep"></span></dd><dt id="def-item-11">VIPR<span class="def-item-dt-sep"></span></dt><dd>vastly undersampled isotropic projection reconstruction<span class="def-item-dd-sep"></span></dd><dt id="def-item-12">WSS<span class="def-item-dt-sep"></span></dt><dd>wall shear stress</dd></dl></div><ul class="copyright-statement"><li class="fn" id="copyright-statement-1">Copyright © American Society of Neuroradiology</li></ul><div class="license" id="license-1"><p id="p-1">Indicates open access to non-subscribers at <a href="http://www.ajnr.org">www.ajnr.org</a></p></div><span class="highwire-journal-article-marker-end"></span></div><span class="related-urls"></span></div><a href="http://ajnr-stage2.stage.highwire.org/content/32/3/E47.full" class="hw-link hw-link-article-full-text" data-icon-position="" data-hide-link-title="0">View Full Text</a></div>  </div>

  
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