Magnitude of cone beam computed tomography image artifacts related to zirconium and titanium implants: impact on image quality.

Magnitude of cone beam computed tomography image artifacts related to zirconium and titanium implants: impact on image quality.

Dentomaxillofac Radiol. 2018 Apr 18;:20180021

Authors: Fontenele RC, Nascimento EH, Vasconcelos TV, Noujeim M, Freitas DQ

Abstract
OBJECTIVES: To evaluate the magnitude of artifacts related to titanium and zirconium implants at different distances and angulations and their impact on cone beam computed tomography (CBCT) image quality.
METHODS: CBCT images were obtained before and after the insertion of titanium and zirconium implants in a mandible on different CBCT units: Picasso Trio, ProMax 3D and 3D Accuitomo 80. Artefact was assessed by measuring the standard deviation of gray values (SD) and contrast-to-noise ratio (CNR) of 11 regions of interest (ROI) at different distances (1.5 cm, 2.5 cm and 3.5 cm) and angulations (65°, 90°, 115° and 140°) from implant region.
RESULTS: For titanium images, SD values did not differ from those of images without implant in all ROIs; however, some effect occurred in Picasso images as higher values were observed in ROIs closer to the implant (p < 0.05). Zirconium images showed higher SD values than the others in some ROIs for Picasso and ProMax (p < 0.05). In ProMax, the difference was observed even in the farthest ROIs from the implant. CNR values were not influenced by the ROI in Picasso, but presented lower values in ROIs closer to the zirconium implant for ProMax and Accuitomo.
CONCLUSIONS: The quantity and magnitude of artifacts in CBCT are influenced by the type of implant and CBCT unit. Although they are more pronounced in regions closer to the implant and located at 90° in relation to the mandibular long axis, they can reach as far as 3.5 cm from the artifact-generator object.

PMID: 29668300 [PubMed - as supplied by publisher]

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