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<meta name="DC.Title" content="Comparison of Image Quality Between Conventional and Low-Dose Nonenhanced Head CT" />
<meta name="DC.Date" content="2004-04-01" />
<meta name="DC.Publisher" content="American Journal of Neuroradiology" />
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<meta name="DC.Description" content="BACKGROUND AND PURPOSE: Increasing use of CT for evaluating neurologic disease may expose patients to considerable levels of ionizing radiation. We compared the image quality of low-mAs head CT scans with that of conventional nonenhanced scans.

METHODS: Conventional head CT scans were obtained in 20 patients (all &gt;65 years with history of non-CNS malignancy) by using a multidetector technique: 170 mA and 1-second scanning time (ie, 170 mAs), 140 kVp, table speed of 7.5 mm per rotation, pitch of 0.75, section thickness of 5 mm, and field of view of 25 mm. A limited volume helical data acquisition covering four 5-mm-thick images was obtained by using 90 mAs but otherwise the same parameters. Three neuroradiologists visually rated the resulting images for quality in a blinded comparison. Representative 1- to 4-mm2 regions of interest were chosen in gray matter and white matter locations. Conspicuity and the contrast-to-noise ratio were analyzed. Statistical comparisons were done by using the Student t test.

RESULTS: Mean gray matter conspicuity was not significantly different between the 170- and 90-mAs groups (0.39 ± 0.19 vs 0.41 ± 0.03, P = .32). Mean gray matter contrast-to-noise ratio was approximately 22% higher with 170 mAs than with 90 mAs (1.77 ± 0.52 vs 1.39 ± 0.38, P = .005). All 90-mAs images were rated as having slightly greater image noise than the 170-mAs scans but with sufficient perceived resolution.

CONCLUSION: Although 90-mAs head CT images were moderately noisier than 170-mAs images, they were rated as having acceptable diagnostic quality." />
<meta name="DC.Contributor" content="Mark E. Mullins" />
<meta name="DC.Contributor" content="Michael H. Lev" />
<meta name="DC.Contributor" content="Peter Bove" />
<meta name="DC.Contributor" content="Cara E. O’Reilly" />
<meta name="DC.Contributor" content="Sanjay Saini" />
<meta name="DC.Contributor" content="James T. Rhea" />
<meta name="DC.Contributor" content="James H. Thrall" />
<meta name="DC.Contributor" content="George J. Hunter" />
<meta name="DC.Contributor" content="Leena M. Hamberg" />
<meta name="DC.Contributor" content="R. Gilberto Gonzalez" />
<meta name="article:published_time" content="2004-04-01" />
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<meta name="citation_title" content="Comparison of Image Quality Between Conventional and Low-Dose Nonenhanced Head CT" />
<meta name="citation_abstract" lang="en" content="&lt;p&gt;&lt;i&gt;BACKGROUND AND PURPOSE:&lt;/i&gt; Increasing use of CT for evaluating neurologic disease may expose patients to considerable levels of ionizing radiation. We compared the image quality of low-mAs head CT scans with that of conventional nonenhanced scans.&lt;/p&gt;&lt;p&gt;&lt;i&gt;METHODS:&lt;/i&gt; Conventional head CT scans were obtained in 20 patients (all &amp;gt;65 years with history of non-CNS malignancy) by using a multidetector technique: 170 mA and 1-second scanning time (ie, 170 mAs), 140 kVp, table speed of 7.5 mm per rotation, pitch of 0.75, section thickness of 5 mm, and field of view of 25 mm. A limited volume helical data acquisition covering four 5-mm-thick images was obtained by using 90 mAs but otherwise the same parameters. Three neuroradiologists visually rated the resulting images for quality in a blinded comparison. Representative 1- to 4-mm&lt;sup&gt;2&lt;/sup&gt; regions of interest were chosen in gray matter and white matter locations. Conspicuity and the contrast-to-noise ratio were analyzed. Statistical comparisons were done by using the Student &lt;i&gt;t&lt;/i&gt; test.&lt;/p&gt;&lt;p&gt;&lt;i&gt;RESULTS:&lt;/i&gt; Mean gray matter conspicuity was not significantly different between the 170- and 90-mAs groups (0.39 ± 0.19 vs 0.41 ± 0.03, &lt;i&gt;P&lt;/i&gt; = .32). Mean gray matter contrast-to-noise ratio was approximately 22% higher with 170 mAs than with 90 mAs (1.77 ± 0.52 vs 1.39 ± 0.38, &lt;i&gt;P&lt;/i&gt; = .005). All 90-mAs images were rated as having slightly greater image noise than the 170-mAs scans but with sufficient perceived resolution.&lt;/p&gt;&lt;p&gt;&lt;i&gt;CONCLUSION:&lt;/i&gt; Although 90-mAs head CT images were moderately noisier than 170-mAs images, they were rated as having acceptable diagnostic quality.&lt;/p&gt;" />
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<meta name="twitter:title" content="Comparison of Image Quality Between Conventional and Low-Dose Nonenhanced Head CT" />
<meta name="twitter:card" content="summary_large_image" />
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<meta name="twitter:description" content="BACKGROUND AND PURPOSE: Increasing use of CT for evaluating neurologic disease may expose patients to considerable levels of ionizing radiation. We compared the image quality of low-mAs head CT scans with that of conventional nonenhanced scans.

METHODS: Conventional head CT scans were obtained in 20 patients (all &gt;65 years with history of non-CNS malignancy) by using a multidetector technique: 170 mA and 1-second scanning time (ie, 170 mAs), 140 kVp, table speed of 7.5 mm per rotation, pitch of 0.75, section thickness of 5 mm, and field of view of 25 mm. A limited volume helical data acquisition covering four 5-mm-thick images was obtained by using 90 mAs but otherwise the same parameters. Three neuroradiologists visually rated the resulting images for quality in a blinded comparison. Representative 1- to 4-mm2 regions of interest were chosen in gray matter and white matter locations. Conspicuity and the contrast-to-noise ratio were analyzed. Statistical comparisons were done by using the Student t test.

RESULTS: Mean gray matter conspicuity was not significantly different between the 170- and 90-mAs groups (0.39 ± 0.19 vs 0.41 ± 0.03, P = .32). Mean gray matter contrast-to-noise ratio was approximately 22% higher with 170 mAs than with 90 mAs (1.77 ± 0.52 vs 1.39 ± 0.38, P = .005). All 90-mAs images were rated as having slightly greater image noise than the 170-mAs scans but with sufficient perceived resolution.

CONCLUSION: Although 90-mAs head CT images were moderately noisier than 170-mAs images, they were rated as having acceptable diagnostic quality." />
<meta name="og-title" property="og:title" content="Comparison of Image Quality Between Conventional and Low-Dose Nonenhanced Head CT" />
<meta name="og-url" property="og:url" content="http://ajnr-stage2.stage.highwire.org/content/25/4/533" />
<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: Increasing use of CT for evaluating neurologic disease may expose patients to considerable levels of ionizing radiation. We compared the image quality of low-mAs head CT scans with that of conventional nonenhanced scans.

METHODS: Conventional head CT scans were obtained in 20 patients (all &gt;65 years with history of non-CNS malignancy) by using a multidetector technique: 170 mA and 1-second scanning time (ie, 170 mAs), 140 kVp, table speed of 7.5 mm per rotation, pitch of 0.75, section thickness of 5 mm, and field of view of 25 mm. A limited volume helical data acquisition covering four 5-mm-thick images was obtained by using 90 mAs but otherwise the same parameters. Three neuroradiologists visually rated the resulting images for quality in a blinded comparison. Representative 1- to 4-mm2 regions of interest were chosen in gray matter and white matter locations. Conspicuity and the contrast-to-noise ratio were analyzed. Statistical comparisons were done by using the Student t test.

RESULTS: Mean gray matter conspicuity was not significantly different between the 170- and 90-mAs groups (0.39 ± 0.19 vs 0.41 ± 0.03, P = .32). Mean gray matter contrast-to-noise ratio was approximately 22% higher with 170 mAs than with 90 mAs (1.77 ± 0.52 vs 1.39 ± 0.38, P = .005). All 90-mAs images were rated as having slightly greater image noise than the 170-mAs scans but with sufficient perceived resolution.

CONCLUSION: Although 90-mAs head CT images were moderately noisier than 170-mAs images, they were rated as having acceptable diagnostic quality." />
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<div id="hw-article-author-popups-top-node-10441--6659951082" style="display: none;"><div class="author-tooltip-0"><div class="author-tooltip-name">Mark E. Mullins </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=Mark%2BE.%2BMullins%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=Mullins%20ME&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%3AMark%2BE.%2BMullins%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">Michael H. 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        	<div class="highwire-cite-metadata"><span  class="highwire-cite-metadata-volume highwire-cite-metadata">Vol. 25</span>, <span  class="highwire-cite-metadata-issue highwire-cite-metadata">Issue 4 </span><div  class="highwire-cite-metadata-pubdate highwire-cite-metadata">1 Apr 2004 </div></div>
      
      
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      <div class="highwire-cite-title">Comparison of Image Quality Between Conventional and Low-Dose Nonenhanced Head CT</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">Mark E.</span> <span class="nlm-surname">Mullins</span></span>, <span class="highwire-citation-author" data-delta="1"><span class="nlm-given-names">Michael H.</span> <span class="nlm-surname">Lev</span></span>, <span class="highwire-citation-author" data-delta="2"><span class="nlm-given-names">Peter</span> <span class="nlm-surname">Bove</span></span>, <span class="highwire-citation-author" data-delta="3"><span class="nlm-given-names">Cara E.</span> <span class="nlm-surname">O’Reilly</span></span>, <span class="highwire-citation-author" data-delta="4"><span class="nlm-given-names">Sanjay</span> <span class="nlm-surname">Saini</span></span>, <span class="highwire-citation-author" data-delta="5"><span class="nlm-given-names">James T.</span> <span class="nlm-surname">Rhea</span></span>, <span class="highwire-citation-author" data-delta="6"><span class="nlm-given-names">James H.</span> <span class="nlm-surname">Thrall</span></span>, <span class="highwire-citation-author" data-delta="7"><span class="nlm-given-names">George J.</span> <span class="nlm-surname">Hunter</span></span>, <span class="highwire-citation-author" data-delta="8"><span class="nlm-given-names">Leena M.</span> <span class="nlm-surname">Hamberg</span></span>, <span class="highwire-citation-author" data-delta="9"><span class="nlm-given-names">R. Gilberto</span> <span class="nlm-surname">Gonzalez</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 2004, </span><span  class="highwire-cite-metadata-volume highwire-cite-metadata">25 </span><span  class="highwire-cite-metadata-issue highwire-cite-metadata">(4) </span><span  class="highwire-cite-metadata-pages highwire-cite-metadata">533-538; </span></div>
  
  
  
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      <div class="highwire-cite-title">Comparison of Image Quality Between Conventional and Low-Dose Nonenhanced Head CT</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">Mark E.</span> <span class="nlm-surname">Mullins</span></span>, <span class="highwire-citation-author" data-delta="1"><span class="nlm-given-names">Michael H.</span> <span class="nlm-surname">Lev</span></span>, <span class="highwire-citation-author" data-delta="2"><span class="nlm-given-names">Peter</span> <span class="nlm-surname">Bove</span></span>, <span class="highwire-citation-author" data-delta="3"><span class="nlm-given-names">Cara E.</span> <span class="nlm-surname">O’Reilly</span></span>, <span class="highwire-citation-author" data-delta="4"><span class="nlm-given-names">Sanjay</span> <span class="nlm-surname">Saini</span></span>, <span class="highwire-citation-author" data-delta="5"><span class="nlm-given-names">James T.</span> <span class="nlm-surname">Rhea</span></span>, <span class="highwire-citation-author" data-delta="6"><span class="nlm-given-names">James H.</span> <span class="nlm-surname">Thrall</span></span>, <span class="highwire-citation-author" data-delta="7"><span class="nlm-given-names">George J.</span> <span class="nlm-surname">Hunter</span></span>, <span class="highwire-citation-author" data-delta="8"><span class="nlm-given-names">Leena M.</span> <span class="nlm-surname">Hamberg</span></span>, <span class="highwire-citation-author" data-delta="9"><span class="nlm-given-names">R. Gilberto</span> <span class="nlm-surname">Gonzalez</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 2004, </span><span  class="highwire-cite-metadata-volume highwire-cite-metadata">25 </span><span  class="highwire-cite-metadata-issue highwire-cite-metadata">(4) </span><span  class="highwire-cite-metadata-pages highwire-cite-metadata">533-538; </span></div>
  
  
  
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