Journal ArticleDOI
Quantitative analysis of metallic artifacts caused by dental metals: comparison of cone-beam and multi-detector row CT scanners
Jira Chindasombatjaroen,Jira Chindasombatjaroen,Naoya Kakimoto,Shumei Murakami,Yoshinobu Maeda,Souhei Furukawa +5 more
TLDR
Artifact areas for the same metals and imaging parameters were smaller with CBCT than with MDCT under most conditions, whereas increasing tube current had no consistent effect on artifacts using either CT device.Abstract:
To quantitatively compare the streak artifacts produced by dental metals in a cone-beam computed tomography (CBCT) device and a multi-detector row computed tomography (MDCT) scanner in relation to metal types and imaging parameters. Cubes of aluminum, titanium, cobalt–chromium alloy, and type IV gold alloy were scanned with CBCT and MDCT scanners at tube voltages of 80 and 100 peak kV (kVp), and currents of 100 and 170 mAs by MDCT, and 102 and 170 mAs by CBCT. Artifact areas were quantified using ImageJ software. Artifact areas for the same metals and imaging parameters were smaller with CBCT than with MDCT under most conditions. Type IV gold alloy caused the largest artifact areas, followed by cobalt–chromium alloy, titanium, and aluminum, respectively. Higher tube voltage was associated with smaller artifact areas under most conditions, whereas increasing tube current had no consistent effect on artifact area using either CT device. CBCT was associated with smaller artifact areas than MDCT for the same parameters. Type IV gold alloy produced the largest artifact areas among the tested metals, but metallic artifacts could be reduced by increasing the tube voltage.read more
Citations
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Journal ArticleDOI
Metal and motion artifacts by cone beam computed tomography (CBCT) in dental and maxillofacial study.
Cosimo Nardi,Claudia Borri,Francesco Regini,Linda Calistri,Alessandro Castellani,Chiara Lorini,Stefano Colagrande +6 more
TL;DR: Cone-Beam-CT diagnostic evaluation was never inhibited by metal artifacts and only in 1.9 % of the cases by motion artifacts, always with a very low CT-dose-index.
Journal ArticleDOI
Artefact expression associated with several cone‐beam computed tomographic machines when imaging root filled teeth
Karla de Faria Vasconcelos,Karla de Faria Vasconcelos,Laura Ferreira Pinheiro Nicolielo,M. C. Nascimento,M. C. Nascimento,Francisco Haiter-Neto,Frab Norberto Bóscolo,J. Van Dessel,Mostafa EzEldeen,Ivo Lambrichts,Reinhilde Jacobs +10 more
TL;DR: The variation of artefact expression was significantly different amongst CBCT machines for root filled teeth, with a specific focus on reducing artefacts induced by dense dental materials, whilst striving for enhanced image quality at low-radiation doses.
Journal ArticleDOI
Quantitative evaluation of metal artifacts using different CBCT devices, high-density materials and field of views.
Marina Codari,Karla de Faria Vasconcelos,Laura Ferreira Pinheiro Nicolielo,Francisco Haiter Neto,Reinhilde Jacobs +4 more
TL;DR: The authors' in-vitro study showed that different CBCT devices, high-density materials and FOV should be considered while evaluating CBCT images and more carefully, diagnosis conclusions should be drawn in images containing amalgam and copper-aluminum alloy.
Journal ArticleDOI
Analysis of metal artifact reduction tools for dental hardware in CT scans of the oral cavity: kVp, iterative reconstruction, dual-energy CT, metal artifact reduction software: does it make a difference?
An De Crop,Jan Casselman,Tom Van Hoof,Melissa Dierens,Elke Vereecke,Nicolas Bossu,Jaime Pamplona,Katharina D'Herde,Hubert Thierens,Klaus Bacher +9 more
TL;DR: Of all investigated techniques, Veo shows to be most promising, with a significant improvement of both the clinical and physical-technical image quality without adversely affecting contrast detail.
Journal ArticleDOI
Image quality assessment of three cone beam CT machines using the SEDENTEXCT CT phantom
TL;DR: The image quality of three CBCT machines using the SEDENTEXCT phantom varied with exposure protocols and machines, but high contrast resolution performed well in all.
References
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Journal ArticleDOI
Artifacts in CT: Recognition and Avoidance
Julia F. Barrett,Nicholas Keat +1 more
TL;DR: To optimize image quality, it is necessary to understand why artifacts occur and how they can be prevented or suppressed, and how design features incorporated into modern CT scanners minimize some types of artifacts.
Journal ArticleDOI
A new volumetric CT machine for dental imaging based on the cone-beam technique: preliminary results
TL;DR: The new system appears to be very promising in dento-maxillo-facial imaging and, due to the good ratio between performance and low cost, together with low radiation dose, very interesting in view of large-scale use of the CT technique in such diagnostic applications.
Journal ArticleDOI
Development of a compact computed tomographic apparatus for dental use.
TL;DR: Ortho-CT as mentioned in this paper is a cone-beam-type of CT apparatus consisting of a multifunctional maxillofacial imaging machine (Scanora, Soredex, Helsinki, Finland) in which the film is replaced with an X-ray imaging intensifier (Hamamatsu Photonics, Hamamatsu, Japan).
Journal ArticleDOI
On cone-beam computed tomography artifacts induced by titanium implants.
TL;DR: The authors' theoretical and experimental results prove massive beam-hardening artifacts for a typical implant diameter and typical energies of up-to-date CBCT machines prove meaningful artifact reduction has to be based on more sophisticated mathematical modeling of the actual physical image acquisition process rather than on postprocessing of the erroneous results obtained from the rather crude reconstruction algorithms used presently.
Journal ArticleDOI
Reducing metal artifacts in cone-beam CT images by preprocessing projection data
TL;DR: An effective metal artifact-suppressing algorithm is implemented to improve the quality of CBCT images and was able to minimize the metal artifacts in phantom and patient studies.