In vitro Evaluation of the Relationship between Gray Scales in Digital Intraoral Radiographs and Hounsfield Units in CT Scans
Identifieur interne : 000205 ( Main/Exploration ); précédent : 000204; suivant : 000206In vitro Evaluation of the Relationship between Gray Scales in Digital Intraoral Radiographs and Hounsfield Units in CT Scans
Auteurs : L. Khojastepour [Iran] ; S. Mohammadzadeh [Iran] ; M. Jazayeri [Iran] ; M. OmidiSource :
- Journal of Biomedical Physics & Engineering [ 2251-7200 ] ; 2017.
Abstract
Jaw bone quality plays an essential role in treatment planning and prognosis of dental implants. Regarding several available methods for bone density measurements, they are not routinely used before implant surgery due to hard accessibility.
An in vitro investigation of correlation between average gray scale in direct digital radiographs and Hounsfield units in CT-Scan provides a feasible method for evaluating alveolar bone quality prior to implant surgery.
26 sheep’s mandibles in which a square shape ROI marked by gutta percha, were prepared. Three direct digital radiographs (CCD sensor) from every specimen were taken using 80, 100 and 200 milli-seconds. Then, the average gray levels for ROIs were calculated using a costume-made software. Next, the specimens were scanned using a 16-slice spiral CT and the Hounsfield Unit of each ROI was calculated. Pearson analysis measured the correlation between Hounsfield units and average gray levels.
There was a positive correlation between Hounsfield unit and average gray level in the radiographs and the correlation was better in higher exposure times.
It is possible to estimate Hounsfield unit and bone density in the jaw bones using average gray scale in a digital radiograph. This approach is easy, simple and available and also results in lower patient exposure comparing other bone densitometric analysis methods.
Url:
PubMed: 29082220
PubMed Central: 5654135
Affiliations:
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">In vitro Evaluation of the Relationship between Gray Scales in Digital Intraoral Radiographs and Hounsfield Units in CT Scans
</title><author><name sortKey="Khojastepour, L" sort="Khojastepour, L" uniqKey="Khojastepour L" first="L." last="Khojastepour">L. Khojastepour</name><affiliation wicri:level="1"><nlm:aff id="aff1">Professor of Oral and Maxillofacial Radiology (M.Sc.), Department of Radiology, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Professor of Oral and Maxillofacial Radiology (M.Sc.), Department of Radiology, School of Dentistry, Shiraz University of Medical Sciences, Shiraz</wicri:regionArea><wicri:noRegion>Shiraz</wicri:noRegion></affiliation></author><author><name sortKey="Mohammadzadeh, S" sort="Mohammadzadeh, S" uniqKey="Mohammadzadeh S" first="S." last="Mohammadzadeh">S. Mohammadzadeh</name><affiliation wicri:level="1"><nlm:aff id="aff2">Specialist in Periodontology (M.Sc.), Department of Periodontics, School of Dentistry, Bushehr University of Medical Sciences, Bushehr, Iran</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Specialist in Periodontology (M.Sc.), Department of Periodontics, School of Dentistry, Bushehr University of Medical Sciences, Bushehr</wicri:regionArea><wicri:noRegion>Bushehr</wicri:noRegion></affiliation></author><author><name sortKey="Jazayeri, M" sort="Jazayeri, M" uniqKey="Jazayeri M" first="M." last="Jazayeri">M. Jazayeri</name><affiliation wicri:level="1"><nlm:aff id="aff3">Specialist in Oral and Maxillofacial Radiology (M.Sc.), Private Clinic of Oral and Maxillofacial Radiology, Khoramabad, Iran</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Specialist in Oral and Maxillofacial Radiology (M.Sc.), Private Clinic of Oral and Maxillofacial Radiology, Khoramabad</wicri:regionArea><wicri:noRegion>Khoramabad</wicri:noRegion></affiliation></author><author><name sortKey="Omidi, M" sort="Omidi, M" uniqKey="Omidi M" first="M." last="Omidi">M. Omidi</name><affiliation><nlm:aff>NONE</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">29082220</idno><idno type="pmc">5654135</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5654135</idno><idno type="RBID">PMC:5654135</idno><date when="2017">2017</date><idno type="wicri:Area/Pmc/Corpus">003027</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">003027</idno><idno type="wicri:Area/Pmc/Curation">003027</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Curation">003027</idno><idno type="wicri:Area/Pmc/Checkpoint">000187</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Checkpoint">000187</idno><idno type="wicri:Area/Ncbi/Merge">007251</idno><idno type="wicri:Area/Ncbi/Curation">007251</idno><idno type="wicri:Area/Ncbi/Checkpoint">007251</idno><idno type="wicri:Area/Main/Merge">000205</idno><idno type="wicri:Area/Main/Curation">000205</idno><idno type="wicri:Area/Main/Exploration">000205</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">In vitro Evaluation of the Relationship between Gray Scales in Digital Intraoral Radiographs and Hounsfield Units in CT Scans
</title><author><name sortKey="Khojastepour, L" sort="Khojastepour, L" uniqKey="Khojastepour L" first="L." last="Khojastepour">L. Khojastepour</name><affiliation wicri:level="1"><nlm:aff id="aff1">Professor of Oral and Maxillofacial Radiology (M.Sc.), Department of Radiology, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Professor of Oral and Maxillofacial Radiology (M.Sc.), Department of Radiology, School of Dentistry, Shiraz University of Medical Sciences, Shiraz</wicri:regionArea><wicri:noRegion>Shiraz</wicri:noRegion></affiliation></author><author><name sortKey="Mohammadzadeh, S" sort="Mohammadzadeh, S" uniqKey="Mohammadzadeh S" first="S." last="Mohammadzadeh">S. Mohammadzadeh</name><affiliation wicri:level="1"><nlm:aff id="aff2">Specialist in Periodontology (M.Sc.), Department of Periodontics, School of Dentistry, Bushehr University of Medical Sciences, Bushehr, Iran</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Specialist in Periodontology (M.Sc.), Department of Periodontics, School of Dentistry, Bushehr University of Medical Sciences, Bushehr</wicri:regionArea><wicri:noRegion>Bushehr</wicri:noRegion></affiliation></author><author><name sortKey="Jazayeri, M" sort="Jazayeri, M" uniqKey="Jazayeri M" first="M." last="Jazayeri">M. Jazayeri</name><affiliation wicri:level="1"><nlm:aff id="aff3">Specialist in Oral and Maxillofacial Radiology (M.Sc.), Private Clinic of Oral and Maxillofacial Radiology, Khoramabad, Iran</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Specialist in Oral and Maxillofacial Radiology (M.Sc.), Private Clinic of Oral and Maxillofacial Radiology, Khoramabad</wicri:regionArea><wicri:noRegion>Khoramabad</wicri:noRegion></affiliation></author><author><name sortKey="Omidi, M" sort="Omidi, M" uniqKey="Omidi M" first="M." last="Omidi">M. Omidi</name><affiliation><nlm:aff>NONE</nlm:aff></affiliation></author></analytic><series><title level="j">Journal of Biomedical Physics & Engineering</title><idno type="eISSN">2251-7200</idno><imprint><date when="2017">2017</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec id="st1"><title>Background:</title><p>Jaw bone quality plays an essential role in treatment planning and prognosis of dental implants. Regarding several available methods for bone density measurements, they are not routinely used before implant surgery due to hard accessibility.
</p></sec><sec id="st2"><title>Objective: </title><p>An in vitro investigation of correlation between average gray scale in direct digital radiographs and Hounsfield units in CT-Scan provides a feasible method for evaluating alveolar bone quality prior to implant surgery.
</p></sec><sec id="st3"><title>Methods: </title><p>26 sheep’s mandibles in which a square shape ROI marked by gutta percha, were prepared. Three direct digital radiographs (CCD sensor) from every specimen were taken using 80, 100 and 200 milli-seconds. Then, the average gray levels for ROIs were calculated using a costume-made software. Next, the specimens were scanned using a 16-slice spiral CT and the Hounsfield Unit of each ROI was calculated. Pearson analysis measured the correlation between Hounsfield units and average gray levels.
</p></sec><sec id="st4"><title>Results:</title><p>There was a positive correlation between Hounsfield unit and average gray level in the radiographs and the correlation was better in higher exposure times.
</p></sec><sec id="st5"><title>Conclusion:</title><p>It is possible to estimate Hounsfield unit and bone density in the jaw bones using average gray scale in a digital radiograph. This approach is easy, simple and available and also results in lower patient exposure comparing other bone densitometric analysis methods.
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uniqKey="Omidi M" first="M." last="Omidi">M. Omidi</name></noCountry><country name="Iran"><noRegion><name sortKey="Khojastepour, L" sort="Khojastepour, L" uniqKey="Khojastepour L" first="L." last="Khojastepour">L. Khojastepour</name></noRegion><name sortKey="Jazayeri, M" sort="Jazayeri, M" uniqKey="Jazayeri M" first="M." last="Jazayeri">M. Jazayeri</name><name sortKey="Mohammadzadeh, S" sort="Mohammadzadeh, S" uniqKey="Mohammadzadeh S" first="S." last="Mohammadzadeh">S. Mohammadzadeh</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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