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Density conversion factor determined using a cone-beam computed tomography unit NewTom QR-DVT 9000

¹ Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada; ² Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada; ³ Division of Oral Radiology, College of Dentistry, University of Saskatchewan, Canada

*Correspondence to: Dr Manuel O Lagravère, Faculty of Medicine and Dentistry, Room 4048, Dentistry/Pharmacy Centre, University of Alberta, Edmonton, Alberta, Canada T6G 2N8; Email: mlagravere{at}ualberta.ca

Received 15 June 2005; revised 20 January 2006; accepted 8 February 2006

Objective: 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 (CBCT-NewTom QR-DVT 9000) data.

Methods: Six cylindrical models of materials with different densities were made and scanned using the NewTom QR-DVT 9000 Volume Scanner. The raw data were converted into DICOM format and analysed using Merge eFilm and AMIRA to determine the HU of different areas of the models.

Results: There was no significant difference (P=0.846) between the HU given by each piece of software. A linear regression was performed using the density, (g cm^–3), as the dependent variable in terms of the HU (H). The regression equation obtained was =0.002H–0.381 with an R² value of 0.986. The standard error of the estimation is 27.104 HU in the case of the Hounsfield Units and 0.064 g cm^–3 in the case of density.

Conclusion: CBCT provides an effective option for determination of material density expressed as Hounsfield Units.

Keywords: Hounsfield value; computerized tomography; bone density

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