Authors
Henrique Mateus Alves Felizardo, Iago Henrique Lara Macedo, Poliana Santos Gonçalves, Amanda Farias-Gomes, Nicolly Oliveira-Santos, Ralf Schulze, Rocharles Cavalcante Fontenele, Hugo Gaêta-Araujo
Published in
Oral surgery, oral medicine, oral pathology and oral radiology. Jul 07, 2026. Epub Jul 07, 2026.
Abstract
To evaluate the effect of different anatomical positions on the formation of beam hardening and photon starvation artifacts produced by different high-density materials in cone-beam computed tomography (CBCT).
Titanium (Ti), zirconia (Zr), and cobalt-chromium (Co-Cr) cylinders were inserted into a polymethyl methacrylate (PMMA) phantom under 4 experimental settings, combining number of cylinders (1 or 2) and their anatomical position (anterior or posterior). CBCT images were acquired using two devices (OP300 and Eagle3D). Five axial slices were selected from each exam, and circular regions of interest were defined. Mean of gray values (MGV) and noise were measured, and absolute difference between test and control regions (|ΔMGV|) expressed artifact intensity. MGV, noise, and |ΔMGV| results were compared according to anatomical position using the analysis of variance (α = 0.05).
The anterior position in the OP300 showed higher MGV and |ΔMGV| for most materials and higher noise for Ti and Co-Cr. In the Eagle3D, anterior position showed higher MGV for Zr and Co-Cr. Noise and |ΔMGV| were higher in the posterior position for all materials.
Anatomical positioning of high-density materials within the devices' projection geometry influences artifact behavior, although this effect is device-dependent.
PMID:
42603740
Bibliographic data and abstract were imported from PubMed on 16 Aug 2026.
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