Deriving Hounsfield units using grey levels in cone beam CT: a clinical application
Identifieur interne : 003F62 ( Ncbi/Merge ); précédent : 003F61; suivant : 003F63Deriving Hounsfield units using grey levels in cone beam CT: a clinical application
Auteurs : Te Reeves [États-Unis] ; P. Mah [États-Unis] ; Wd Mcdavid [États-Unis]Source :
- Dentomaxillofacial Radiology [ 0250-832X ] ; 2012.
Abstract
To present a clinical study demonstrating a method to derive Hounsfield units from grey levels in cone beam CT (CBCT).
An acrylic intraoral reference object with aluminium, outer bone equivalent material (cortical bone), inner bone equivalent material (trabecular bone), polymethlymethacrylate and water equivalent material was used. Patients were asked if they would be willing to have an acrylic bite plate with the reference object placed in their mouth during a routine CBCT scan. There were 31 scans taken on the Asahi Alphard 3030 (Belmont Takara, Kyoto, Japan) and 30 scans taken on the Planmeca ProMax 3D (Planmeca, Helsinki, Finland) CBCT. Linear regression between the grey levels of the reference materials and their linear attenuation coefficients was performed for various photon energies. The energy with the highest regression coefficient was chosen as the effective energy. The attenuation coefficients for the five materials at the effective energy were scaled as Hounsfield units using the standard Hounsfield units equation and compared to those derived from the measured grey levels of the materials using the regression equation.
In general, there was a satisfactory linear relation between the grey levels and the attenuation coefficients. This made it possible to calculate Hounsfield units from the measured grey levels. Uncertainty in determining effective energies resulted in unrealistic effective energies and significant variability of calculated CT numbers. Linear regression from grey levels directly to Hounsfield units at specified energies resulted in greater consistency.
The clinical application of a method for deriving Hounsfield units from grey levels in CBCT was demonstrated.
Url:
DOI: 10.1259/dmfr/31640433
PubMed: 22752324
PubMed Central: 3520389
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<author><name sortKey="Mah, P" sort="Mah, P" uniqKey="Mah P" first="P" last="Mah">P. Mah</name>
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<series><title level="j">Dentomaxillofacial Radiology</title>
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<front><div type="abstract" xml:lang="en"><sec><title>Objective</title>
<p>To present a clinical study demonstrating a method to derive Hounsfield units from grey levels in cone beam CT (CBCT).</p>
</sec>
<sec><title>Methods</title>
<p>An acrylic intraoral reference object with aluminium, outer bone equivalent material (cortical bone), inner bone equivalent material (trabecular bone), polymethlymethacrylate and water equivalent material was used. Patients were asked if they would be willing to have an acrylic bite plate with the reference object placed in their mouth during a routine CBCT scan. There were 31 scans taken on the Asahi Alphard 3030 (Belmont Takara, Kyoto, Japan) and 30 scans taken on the Planmeca ProMax 3D (Planmeca, Helsinki, Finland) CBCT. Linear regression between the grey levels of the reference materials and their linear attenuation coefficients was performed for various photon energies. The energy with the highest regression coefficient was chosen as the effective energy. The attenuation coefficients for the five materials at the effective energy were scaled as Hounsfield units using the standard Hounsfield units equation and compared to those derived from the measured grey levels of the materials using the regression equation.</p>
</sec>
<sec><title>Results</title>
<p>In general, there was a satisfactory linear relation between the grey levels and the attenuation coefficients. This made it possible to calculate Hounsfield units from the measured grey levels. Uncertainty in determining effective energies resulted in unrealistic effective energies and significant variability of calculated CT numbers. Linear regression from grey levels directly to Hounsfield units at specified energies resulted in greater consistency.</p>
</sec>
<sec><title>Conclusions</title>
<p>The clinical application of a method for deriving Hounsfield units from grey levels in CBCT was demonstrated.</p>
</sec>
</div>
</front>
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<pmc article-type="research-article"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Dentomaxillofac Radiol</journal-id>
<journal-id journal-id-type="iso-abbrev">Dentomaxillofac Radiol</journal-id>
<journal-id journal-id-type="hwp">dmfr</journal-id>
<journal-id journal-id-type="publisher-id">dmf</journal-id>
<journal-title-group><journal-title>Dentomaxillofacial Radiology</journal-title>
</journal-title-group>
<issn pub-type="ppub">0250-832X</issn>
<issn pub-type="epub">1476-542X</issn>
<publisher><publisher-name>The British Institute of Radiology.</publisher-name>
<publisher-loc>131–151 Great Titchfield Street, London W1W 5BB</publisher-loc>
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<article-meta><article-id pub-id-type="pmid">22752324</article-id>
<article-id pub-id-type="pmc">3520389</article-id>
<article-id pub-id-type="publisher-id">D11127</article-id>
<article-id pub-id-type="doi">10.1259/dmfr/31640433</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Research</subject>
</subj-group>
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<title-group><article-title>Deriving Hounsfield units using grey levels in cone beam CT: a clinical application</article-title>
<alt-title alt-title-type="running-head">Deriving Hounsfield units in CBCT: clinical application</alt-title>
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<contrib-group><contrib contrib-type="author"><name><surname>Reeves</surname>
<given-names>TE</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
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<contrib contrib-type="author"><name><surname>Mah</surname>
<given-names>P</given-names>
</name>
<xref ref-type="corresp" rid="cor1">*</xref>
<xref ref-type="aff" rid="aff2">2</xref>
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<contrib contrib-type="author"><name><surname>McDavid</surname>
<given-names>WD</given-names>
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<xref ref-type="aff" rid="aff2">2</xref>
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<aff id="aff1"><label>1</label>
<addr-line>Lackland Airforce Base, San Antonio, TX, USA</addr-line>
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<aff id="aff2"><label>2</label>
<addr-line>University of Texas Health Science Center at San Antonio, Department of Comprehensive Dentistry, San Antonio, TX, USA</addr-line>
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<author-notes><corresp id="cor1">Dr Peter Mah, Department of Dental Diagnostic Science, University of Texas Health Science Centre at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA. E-mail: <email>mah@uthscsa.edu</email>
</corresp>
</author-notes>
<pub-date pub-type="ppub"><month>9</month>
<year>2012</year>
</pub-date>
<volume>41</volume>
<issue>6</issue>
<fpage>500</fpage>
<lpage>508</lpage>
<history><date date-type="received"><day>15</day>
<month>4</month>
<year>2011</year>
</date>
<date date-type="rev-recd"><day>29</day>
<month>7</month>
<year>2011</year>
</date>
<date date-type="accepted"><day>7</day>
<month>8</month>
<year>2011</year>
</date>
</history>
<permissions><copyright-statement>© 2012 The British Institute of Radiology</copyright-statement>
<copyright-year>2012</copyright-year>
</permissions>
<abstract><sec><title>Objective</title>
<p>To present a clinical study demonstrating a method to derive Hounsfield units from grey levels in cone beam CT (CBCT).</p>
</sec>
<sec><title>Methods</title>
<p>An acrylic intraoral reference object with aluminium, outer bone equivalent material (cortical bone), inner bone equivalent material (trabecular bone), polymethlymethacrylate and water equivalent material was used. Patients were asked if they would be willing to have an acrylic bite plate with the reference object placed in their mouth during a routine CBCT scan. There were 31 scans taken on the Asahi Alphard 3030 (Belmont Takara, Kyoto, Japan) and 30 scans taken on the Planmeca ProMax 3D (Planmeca, Helsinki, Finland) CBCT. Linear regression between the grey levels of the reference materials and their linear attenuation coefficients was performed for various photon energies. The energy with the highest regression coefficient was chosen as the effective energy. The attenuation coefficients for the five materials at the effective energy were scaled as Hounsfield units using the standard Hounsfield units equation and compared to those derived from the measured grey levels of the materials using the regression equation.</p>
</sec>
<sec><title>Results</title>
<p>In general, there was a satisfactory linear relation between the grey levels and the attenuation coefficients. This made it possible to calculate Hounsfield units from the measured grey levels. Uncertainty in determining effective energies resulted in unrealistic effective energies and significant variability of calculated CT numbers. Linear regression from grey levels directly to Hounsfield units at specified energies resulted in greater consistency.</p>
</sec>
<sec><title>Conclusions</title>
<p>The clinical application of a method for deriving Hounsfield units from grey levels in CBCT was demonstrated.</p>
</sec>
</abstract>
<kwd-group><kwd>cone beam computed tomography</kwd>
<kwd>Hounsfield units</kwd>
<kwd>grey levels</kwd>
<kwd>bone density</kwd>
<kwd>linear attenuation coefficient</kwd>
</kwd-group>
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