Evaluation of artifacts generated by zirconium implants in cone-beam computed tomography images
| Autor: | Marcel E Noujeim, Taruska Ventorini Vasconcelos, Deborah Queiroz Freitas, C. A. McMahan, Boulos Bechara |
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| Rok vydání: | 2017 |
| Předmět: |
Cone beam computed tomography
chemistry.chemical_element computer.software_genre Standard deviation Artifact reduction 030218 nuclear medicine & medical imaging Pathology and Forensic Medicine 03 medical and health sciences 0302 clinical medicine Voxel Medicine Radiology Nuclear Medicine and imaging Dentistry (miscellaneous) Dental Implants Artifact (error) Zirconium Phantoms Imaging business.industry Edentulous mandible 030206 dentistry Cone-Beam Computed Tomography chemistry Surgery Implant Oral Surgery Artifacts Nuclear medicine business computer |
| Zdroj: | Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology. 123:265-272 |
| ISSN: | 2212-4403 |
| DOI: | 10.1016/j.oooo.2016.10.021 |
| Popis: | Objective 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. |
| Databáze: | OpenAIRE |
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