Title: Variability of dental cone beam CT grey values for density estimations
Authors: Pauwels, Ruben ×
Nackaerts, Olivia
Bellaiche, Norbert
Stamatakis, Harry
Tsiklakis, Kostas
Walker, Adrian
Bosmans, Hilde
Bogaerts, Ria
Jacobs, Reinhilde
Horner, Keith
The SEDENTEXCT Project Consortium #
Issue Date: 1-Jan-2013
Publisher: British Institute of Radiology
Series Title: The British Journal of Radiology vol:86 issue:1021
Article number: UNSP 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.
ISSN: 0007-1285
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Department of Neurosciences - miscellaneous
Medical Physics & Quality Assessment (+)
Oral Imaging
Oral and Maxillo-facial Surgery - Imaging & Pathology (OMFS-IMPATH)
Laboratory of Experimental Radiotherapy
× corresponding author
# (joint) last author

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