Quantitative evaluation of metal artifacts using different CBCT devices, high-density materials and field of views

Author(s)

Codari, Marina ^{[1, 2, 3]} ; Vasconcelos, Karla de Faria ^{[1, 2, 4]} ; Pinheiro Nicolielo, Laura Ferreira ^{[1, 2]} ; Neto, Francisco Haiter ^[4] ; Jacobs, Reinhilde ^{[1, 2]}

Affiliation

^[1] Katholieke Univ Leuven, Fac Med, Dept Imaging & Pathol, OMFS IMPATH Res Grp, OIC, Leuven - Belgium

^[2] Univ Hosp Leuven, Oral & Maxillofacial Surg, Leuven - Belgium

^[3] Univ Milan, Dept Biomed Sci Hlth, Fac Med & Surg, Via Mangiagalli 31, I-20133 Milan - Italy

^[4] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Oral Diag, Div Oral Radiol, Sao Paulo - Brazil

• Document type: Journal article
• Source: Clinical Oral Implants Research; v. 28, n. 12, p. 1509-1514, DEC 2017.
• Web of Science Citations: 16

Abstract

ObjectiveTo objectively compare the influence of different cone-beam computed tomography (CBCT) devices, high-density materials and field of views (FOVs) on metal artifact expression. Material and methodsFor this invitro study, three customized acrylic resin phantoms containing high-density materials cylinders: titanium, copper-aluminum alloy and amalgam were scanned on three CBCT devices using high-resolution protocols, same voxel size (0.2mm) and different FOVs. After fully automatic segmentation and image registration, the same region of interest was defined for the small and medium FOVs. The difference between the segmented and the real volume of the metal cylinders was assessed. Moreover for each segmented slice, the area difference between the segmented and the real axial section was determined. The artifacts on the background were measured as normalizing standard deviation of voxel values in the vicinity of the cylinder, in three different distances. ResultsConsiderable differences were observed in volume measurements for all CBCTs devices and materials for both FOV sizes (up to 67%). The slice per slice area analysis indicated higher artifacts at the edges of the metal cylinder. Within the materials, amalgam and titanium had, respectively, the worst and best artifact expression in all the CBCT devices. Standard deviation values varied differently between the three distances in each device. ConclusionOur invitro study showed that different CBCT devices, high-density materials and FOV should be considered while evaluating CBCT images. More carefully, diagnosis conclusions should be drawn in images containing amalgam and copper-aluminum alloy. (AU)

• FAPESP's process: 14/17744-5 - Effectiveness of algorithms artifacts reduction in tomographic images
• Grantee: Karla de Faria Vasconcelos
• Support Opportunities: Scholarships in Brazil - Post-Doctoral