Accuracy assessment of the axial images obtained from cone beam computed tomography |
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Authors: | Panzarella Francine Kühl Junqueira J L C Oliveira L B de Araújo N S Costa C |
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Affiliation: | Faculdade São Leopoldo Mandic, School of Dentistry, Campinas, Brazil |
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Abstract: | ObjectiveThe aim of this study was to evaluate accuracy of linear measurements assessed from axial tomograms and the influence of the use of different protocols in two cone beam CT (CBCT) units.MethodsA cylinder object consisting of Nylon® (Day Brazil, Sao Paulo, Brazil) with radiopaque markers was radiographically examined applying different protocols from NewTom 3GTM (Quantitative Radiology s.r.l, Verona, Veneto, Italy) and i-CATTM (Imaging Sciences International, Hatfield, PA) units. Horizontal (A–B) and vertical (C–D) distances were assessed from axial tomograms and measured using a digital calliper that provided the gold standard for actual values.ResultsThere were differences when considering acquisition protocols to each CBCT unit. Concerning all analysed protocols from i-CATTM and Newtom 3GTM, both A–B and C–D distances presented underestimated values. Measurements of the axial images obtained from NewTom 3GTM (6 inch 0.16 mm and 9 inch 0.25 mm) were similar to the ones obtained from i-CATTM (13 cm 20 s 0.3 mm, 13 cm 20 s 0.4 mm and 13 cm 40 s 0.25 mm).ConclusionThe use of different protocols from CBCT machines influences linear measurements assessed from axial images. Linear distances were underestimated in both equipments. Our findings suggest that the best protocol for the i-CATTM is 13 cm 20 s 0.3 mm and for the NewTom 3GTM, the use of 6 inch or 9 inch is recommended. |
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Keywords: | cone beam computed tomography accuracy image quality |
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