Imaging Science in Dentistry

Korean Academy of Oral and Maxillofacial Radiology (대한영상치의학회)
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Measurement of hard tissue density of head phantom based on the HU by using CBCT

콘빔형 전산화단층영상에서 HU에 의한 두경부 팬텀 경조직의 밀도 측정

  • Kim, Moon-Sun (Department of Prosthodontics, School of Dentistry, Chosun University) ;
  • Kim, Jae-Duk (Department of Oral and Maxillofacial Radiology, School of Dentistry, Chosun University) ;
  • Kang, Dong-Wan (Department of Prosthodontics, School of Dentistry, Chosun University)
  • 김문선 (조선대학교 치의학전문대학원 보철학교실) ;
  • 김재덕 (조선대학교 치의학전문대학원 구강악안면방사선학교실) ;
  • 강동완 (조선대학교 치의학전문대학원 보철학교실)
  • Published : 2009.09.30
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Abstract

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 ($CBMercuRay^{TM}$) 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 $CBMercuRay^{TM}$ (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 $CBWorks^{TM}$. 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, $\rho$($g\;cm^{-3}$), as the dependent variable in terms of the HU (H). The regression equation obtained was $\rho=0.00072H-0.01588$ with an $R^2$ value of 0.9968. Density values based on the Hounsfield scale was $1697.1{\pm}24.9\;HU$ in cortical bone, $526.5{\pm}44.4\;HU$ in trabecular bone, $2639.1{\pm}48.7\;HU$ in enamel, $1246.1{\pm}39.4\;HU$ in dentin of dental head phantom. Conclusion : CBCT provides an effective option for determination of material density expressed as Hounsfield Units.

Keywords

References

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