2.2. Equipment CBCT and protocols
For this study were evaluated nine 3D image acquisition protocols in five different pieces of equipment. The models of the CBCT equipment and the protocols evaluated are presented in Table 1. For all protocols, exposures were carried out in an anthropomorphic phantom, with the same conditions of a real patient (technical and geometric parameters). The X-ray emission pulsed mode was used for all protocols. The protocols used in the facility images were evaluated for each model and classified according to the dimensions of the field of view (FOV) and purpose of the examination as follows: (i) large FOV, protocols with a diameter greater than 14 cm (Gendex and i-CAT), which scan both jaws in a single exposure; (ii) small FOV, localized protocol, for the images of some dental units; (iii) 1 arch protocols, protocols for the full arch images (in this study, the upper jaw) in a single exposure and (iv) two-arch protocols (8 cm of height), protocols that scan both jaws in a single exposure. The technical parameters of the selected protocols are present in Table 1.
2.2. Equipment CBCT and protocolsFor this study were evaluated nine 3D image acquisition protocols in five different pieces of equipment. The models of the CBCT equipment and the protocols evaluated are presented in Table 1. For all protocols, exposures were carried out in an anthropomorphic phantom, with the same conditions of a real patient (technical and geometric parameters). The X-ray emission pulsed mode was used for all protocols. The protocols used in the facility images were evaluated for each model and classified according to the dimensions of the field of view (FOV) and purpose of the examination as follows: (i) large FOV, protocols with a diameter greater than 14 cm (Gendex and i-CAT), which scan both jaws in a single exposure; (ii) small FOV, localized protocol, for the images of some dental units; (iii) 1 arch protocols, protocols for the full arch images (in this study, the upper jaw) in a single exposure and (iv) two-arch protocols (8 cm of height), protocols that scan both jaws in a single exposure. The technical parameters of the selected protocols are present in Table 1.
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