EdenteV2, Pmc, Corpus, bibRecord, 002282

Deriving Hounsfield units using grey levels in cone beam CT: a clinical application

Identifieur interne : 002282 ( Pmc/Corpus ); précédent : 002281; suivant : 002283

Deriving Hounsfield units using grey levels in cone beam CT: a clinical application

Auteurs : Te Reeves ; P. Mah ; Wd Mcdavid

Source :

Dentomaxillofacial Radiology [ 0250-832X ] ; 2012.

RBID : PMC:3520389

Abstract

Objective

To present a clinical study demonstrating a method to derive Hounsfield units from grey levels in cone beam CT (CBCT).

Methods

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.

Results

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.

Conclusions

The clinical application of a method for deriving Hounsfield units from grey levels in CBCT was demonstrated.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3520389

DOI: 10.1259/dmfr/31640433
PubMed: 22752324
PubMed Central: 3520389

Links to Exploration step

PMC:3520389

Le document en format XML

<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Deriving Hounsfield units using grey levels in cone beam CT: a clinical application</title>
<author><name sortKey="Reeves, Te" sort="Reeves, Te" uniqKey="Reeves T" first="Te" last="Reeves">Te Reeves</name>
<affiliation><nlm:aff id="aff1"><addr-line>Lackland Airforce Base, San Antonio, TX, USA</addr-line>
</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Mah, P" sort="Mah, P" uniqKey="Mah P" first="P" last="Mah">P. Mah</name>
<affiliation><nlm:aff id="aff2"><addr-line>University of Texas Health Science Center at San Antonio, Department of Comprehensive Dentistry, San Antonio, TX, USA</addr-line>
</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Mcdavid, Wd" sort="Mcdavid, Wd" uniqKey="Mcdavid W" first="Wd" last="Mcdavid">Wd Mcdavid</name>
<affiliation><nlm:aff id="aff2"><addr-line>University of Texas Health Science Center at San Antonio, Department of Comprehensive Dentistry, San Antonio, TX, USA</addr-line>
</nlm:aff>
</affiliation>
</author>
</titleStmt>
<publicationStmt><idno type="wicri:source">PMC</idno>
<idno type="pmid">22752324</idno>
<idno type="pmc">3520389</idno>
<idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3520389</idno>
<idno type="RBID">PMC:3520389</idno>
<idno type="doi">10.1259/dmfr/31640433</idno>
<date when="2012">2012</date>
<idno type="wicri:Area/Pmc/Corpus">002282</idno>
<idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">002282</idno>
</publicationStmt>
<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Deriving Hounsfield units using grey levels in cone beam CT: a clinical application</title>
<author><name sortKey="Reeves, Te" sort="Reeves, Te" uniqKey="Reeves T" first="Te" last="Reeves">Te Reeves</name>
<affiliation><nlm:aff id="aff1"><addr-line>Lackland Airforce Base, San Antonio, TX, USA</addr-line>
</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Mah, P" sort="Mah, P" uniqKey="Mah P" first="P" last="Mah">P. Mah</name>
<affiliation><nlm:aff id="aff2"><addr-line>University of Texas Health Science Center at San Antonio, Department of Comprehensive Dentistry, San Antonio, TX, USA</addr-line>
</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Mcdavid, Wd" sort="Mcdavid, Wd" uniqKey="Mcdavid W" first="Wd" last="Mcdavid">Wd Mcdavid</name>
<affiliation><nlm:aff id="aff2"><addr-line>University of Texas Health Science Center at San Antonio, Department of Comprehensive Dentistry, San Antonio, TX, USA</addr-line>
</nlm:aff>
</affiliation>
</author>
</analytic>
<series><title level="j">Dentomaxillofacial Radiology</title>
<idno type="ISSN">0250-832X</idno>
<idno type="eISSN">1476-542X</idno>
<imprint><date when="2012">2012</date>
</imprint>
</series>
</biblStruct>
</sourceDesc>
</fileDesc>
<profileDesc><textClass></textClass>
</profileDesc>
</teiHeader>
<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>
</TEI>
<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>
</publisher>
</journal-meta>
<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>
</article-categories>
<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>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Reeves</surname>
<given-names>TE</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
</contrib>
<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>
</contrib>
<contrib contrib-type="author"><name><surname>McDavid</surname>
<given-names>WD</given-names>
</name>
<xref ref-type="aff" rid="aff2">2</xref>
</contrib>
</contrib-group>
<aff id="aff1"><label>1</label>
<addr-line>Lackland Airforce Base, San Antonio, TX, USA</addr-line>
</aff>
<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>
</aff>
<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>
</article-meta>
</front>
</pmc>
</record>

Pour manipuler ce document sous Unix (Dilib)

EXPLOR_STEP=$WICRI_ROOT/Wicri/Santé/explor/EdenteV2/Data/Pmc/Corpus

HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 002282 | SxmlIndent | more

HfdSelect -h $EXPLOR_AREA/Data/Pmc/Corpus/biblio.hfd -nk 002282 | SxmlIndent | more

Pour mettre un lien sur cette page dans le réseau Wicri

{{Explor lien
   |wiki=    Wicri/Santé
   |area=    EdenteV2
   |flux=    Pmc
   |étape=   Corpus
   |type=    RBID
   |clé=     PMC:3520389
   |texte=   Deriving Hounsfield units using grey levels in cone beam CT: a clinical application
}}

Pour générer des pages wiki

HfdIndexSelect -h $EXPLOR_AREA/Data/Pmc/Corpus/RBID.i   -Sk "pubmed:22752324" \
       | HfdSelect -Kh $EXPLOR_AREA/Data/Pmc/Corpus/biblio.hfd   \
       | NlmPubMed2Wicri -a EdenteV2

This area was generated with Dilib version V0.6.32.
Data generation: Thu Nov 30 15:26:48 2017. Site generation: Tue Mar 8 16:36:20 2022

	Serveur d'exploration sur le patient édenté
	Attention, ce site est en cours de développement ! Attention, site généré par des moyens informatiques à partir de corpus bruts. Les informations ne sont donc pas validées.

Serveur d'exploration sur le patient édenté

Deriving Hounsfield units using grey levels in cone beam CT: a clinical application

Deriving Hounsfield units using grey levels in cone beam CT: a clinical application

Source :

Abstract

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

Pour générer des pages wiki