10/27/2022 0 Comments Anatomage In Vivo Viewer![]() ![]() Although the Dolphin imaging software has been constantly updated, the updated features refer to improvement of 3D rendering algorithms and functionality. The axial images were imported in Dolphin 3D (pre-release version 1, Dolphin Imaging & Management Systems, Chatsworth, Calif). The axial slice thickness was 0.3 mm, and the voxels were isotropic. The imaging protocol used a 12-in field of view to include the entire facial anatomy. The plate was scanned at 300 dpi (Digora PCT, Soredex USA, Milwaukee, Wis).ĬBCT scans were made before orthognathic surgery with the NewTom 3G (AFP Imaging, Elmsford, NY). A photostimulable phosphor plate was used as the detector and positioned 11.5 cm from the midsagittal plane. The source-midsagittal plane distance was 152.4 cm (5 feet). Informed consent was obtained from all subjects, and the study was approved by the Institutional Review Board.Ĭonventional cephalograms were acquired by positioning the patients in a cephalostat in natural head position (Wehmer Cephalostat, Addison, Ill). ![]() Thirty-one patients (13 male, 18 female 21.6 ± 7.9 years) treated in the Dentofacial Deformities Program at the School of Dentistry were recruited for this study. ![]() The specific aims were to test the null hypotheses that cephalometric measurements are not different for conventional cephalometric radiographs and synthesized CBCT cephalograms using either perspective or orthogonal reconstruction algorithms. 11 The purpose of this study was to determine whether CBCT synthesized cephalograms provide the same measurement as conventional cephalograms when applied to patients. 9, 10Ī previous study suggested that measurements from CBCT synthesized cephalograms are similar to those from conventional cephalograms in vitro. CBCT image data can be used to simulate panoramic, lateral, and posteroanterior cephalometric radiographs so that they can be compared with preexisting image databases. 6 - 8 While 3D analysis for diagnosis and treatment undergoes clinical validation, 2D image simulation tools may be used on 3D volumes and can help bridge the gap between 2D and 3D image types. The advantages of CBCT over CT include low radiation dose, lower cost, potentially better access, and high spatial resolution. The introduction of maxillofacial cone beam CT (CBCT) has made 3D imaging more readily available for dental applications. 4 Despite the usefulness of computed tomography (CT), the high cost and relatively high radiation exposure make this modality unsuitable for orthodontic purposes. Three-dimensional imaging techniques are becoming increasingly popular and have opened new possibilities for orthodontic diagnosis and treatment assessment. This may lead to errors of identification and reduced measurement accuracy. Consequently, cephalograms have inherent limitations as a result of distortion and differential magnification of the craniofacial complex. Lateral cephalograms are two-dimensional (2D) radiographs that are used to depict three-dimensional (3D) structures. It has been used for decades to obtain absolute and relative measures of the craniofacial skeleton. Cephalometry is an essential clinical and research tool in orthodontics. ![]()
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