Variability of dental cone beam CT grey values for density estimations
Open Access
- 31 December 2012
- journal article
- research article
- Published by Oxford University Press (OUP) in The British Journal of Radiology
- Vol. 86 (1021), 20120135
- https://doi.org/10.1259/bjr.20120135
Abstract
Objective: The aim of this study was to investigate the use of dental cone beam CT (CBCT) grey values for density estimations by calculating the correlation with multislice CT (MSCT) values and the grey value error after recalibration. Methods: A polymethyl methacrylate (PMMA) phantom was developed containing inserts of different density: air, PMMA, hydroxyapatite (HA) 50 mg cm(-3), HA 100, HA 200 and aluminium. The phantom was scanned on 13 CBCT devices and 1 MSCT device. Correlation between CBCT grey values and CT numbers was calculated, and the average error of the CBCT values was estimated in the medium-density range after recalibration. Results: Pearson correlation coefficients ranged between 0.7014 and 0.9996 in the full-density range and between 0.5620 and 0.9991 in the medium-density range. The average error of CBCT voxel values in the medium-density range was between 35 and 1562. Conclusion: Even though most CBCT devices showed a good overall correlation with CT numbers, large errors can be seen when using the grey values in a quantitative way. Although it could be possible to obtain pseudo-Hounsfield units from certain CBCTs, alternative methods of assessing bone tissue should be further investigated. Advances in knowledge: The suitability of dental CBCT for density estimations was assessed, involving a large number of devices and protocols. The possibility for grey value calibration was thoroughly investigated.This publication has 41 references indexed in Scilit:
- Assessment of Bone Density in the Posterior Maxilla Based on Hounsfield Units to Enhance the Initial Stability of ImplantsClinical Implant Dentistry and Related Research, 2011
- Quantification of metal artifacts on cone beam computed tomography imagesClinical Oral Implants Research, 2011
- Development and applicability of a quality control phantom for dental cone-beam CTJournal of Applied Clinical Medical Physics, 2010
- State-of-the-art on cone beam CT imaging for preoperative planning of implant placementClinical Oral Investigations, 2006
- Three‐dimensional morphometric analysis of human cadaver bone: microstructural data from maxilla and mandibleClinical Oral Implants Research, 2004
- Cone Beam CT for Pre-Surgical Assessment of Implant SitesJournal of the California Dental Association, 2003
- Statistical inversion for medical x-ray tomography with few radiographs: I. General theoryPhysics in Medicine & Biology, 2003
- Imaging Technique Selection for the Preoperative Planning of Oral Implants: A Review of the LiteratureClinical Implant Dentistry and Related Research, 2002
- Bone classification: an objective scale of bone density using the computerized tomography scanClinical Oral Implants Research, 2001
- Characterization of bone quality using computer‐extracted radiographic featuresMedical Physics, 1999