Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/328958
Type: Artigo
Title: Evaluation Of Artifacts Generated By Zirconium Implants In Cone-beam Computed Tomography Images
Author: Vasconcelos
Taruska Ventorini; Bechara
Boulos B.; McMahan
Clyde Alex; Freitas
Deborah Queiroz; Noujeim
Marcel
Abstract: To evaluate zirconium implant artifact production in cone beam computed tomography images obtained with different protocols. Study Design. One zirconium implant was inserted in an edentulous mandible. Twenty scans were acquired with a ProMax 3D unit (Planmeca Oy, Helsinki, Finland), with acquisition settings ranging from 70 to 90 peak kilovoltage (kVp) and voxel sizes of 0.32 and 0.16 mm. A metal artifact reduction (MAR) tool was activated in half of the scans. An axial slice through the middle region of the implant was selected for each dataset. Gray values (mean +/- standard deviation) were measured in two regions of interest, one close to and the other distant from the implant (control area). The contrast-to-noise ratio was also calculated. Results. Standard deviation decreased with greater kVp and when the MAR tool was used. The contrast-to-noise ratio was significantly higher when the MAR tool was turned off, except for low resolution with kVp values above 80. Selection of the MAR tool and greater kVp resulted in an overall reduction of artifacts in images acquired with low resolution. Conclusions. Although zirconium implants do produce image artifacts in cone-bean computed tomography scans, the setting that best controlled artifact generation by zirconium implants was 90 kVp at low resolution and with the MAR tool turned on.
Subject: In-vitro Assessment
Maxillofacial Radiology
Ct
Reduction
Titanium
Algorithm
Academy
Editor: Elsevier Science Inc
New York
Rights: fechado
Identifier DOI: 10.1016/j.oooo.2016.10.021
Address: http://www.sciencedirect.com/science/article/pii/S2212440316306605
Date Issue: 2017
Appears in Collections:Unicamp - Artigos e Outros Documentos

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