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KMID : 0896020090390030115
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Korean Journal of Oral and Maxillofacial Radiology
2009 Volume.39 No. 3 p.115 ~ p.120
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Measurement of hard tissue density of head phantom based on the HU by using CBCT
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Kim Moon-Sun
Kim Jae-Duk
Kang Dong-Wan
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Abstract
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Purpose : The purpose of this study was to determine a conversion coefficient for Hounsfield Units(HU) to material density (g cm-3) obtained from cone-beam computed tomography (CBMercuRay™) data and to measure the hard tissue density based on the Hounsfield scale on dental head phantom.
Materials and Methods : CT Scanner Phantom (AAPM) equipped with CT Number Insert consists of five cylindrical pins of materials with different densities and teflon ring was scanned by using the CBMercuRay™ (Hitachi, Tokyo, Japan) volume scanner. The raw data were converted into DICOM format and the HU of different areas of CT number insert measured by using CBWorks™. Linear regression analysis and Student t-test were performed statistically.
Results : There was no significant difference (P>0.54) between real densities and measured densities. A linear regression was performed using the density, ρ (g cm-3), as the dependent variable in terms of the HU (H). The regression equation obtained was ρ=0.00072H-0.01588 with an R2 value of 0.9968. Density values based on the Hounsfield scale was 1697.1±24.9 HU in cortical bone, 526.5±44.4 HU in trabecular bone, 2639.1±48.7 HU in enamel, 1246.1±39.4 HU in dentin of dental head phantom.
Conclusion : CBCT provides an effective option for determination of material density expressed as Hounsfield Units.
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KEYWORD
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Cone-Beam Computed Tomography, Density, Bone, Hounsfield unit, Phantoms, Imaging
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