Abstract
PurposeThe purpose of this study was to investigate the influence of head motion on the accuracy of three-dimensional (3D) reconstruction with cone-beam computed tomography (CBCT) scan.Materials and MethodsFifteen dry skulls were incorporated into a motion controller which simulated four types of head motion during CBCT scan: 2 horizontal rotations (to the right/to the left) and 2 vertical rotations (upward/downward). Each movement was triggered to occur at the start of the scan for 1 second by remote control. Four maxillofacial surface models with head motion and one control surface model without motion were obtained for each skull. Nine landmarks were identified on the five maxillofacial surface models for each skull, and landmark identification errors were compared between the control model and each of the models with head motion.ResultsRendered surface models with head motion were similar to the control model in appearance; however, the landmark identification errors showed larger values in models with head motion than in the control. In particular, the Porion in the horizontal rotation models presented statistically significant differences (P < .05). Statistically significant difference in the errors between the right and left side landmark was present in the left side rotation which was opposite direction to the scanner rotation (P < .05).ConclusionsPatient movement during CBCT scan might cause landmark identification errors on the 3D surface model in relation to the direction of the scanner rotation. Clinicians should take this into consideration to prevent patient movement during CBCT scan, particularly horizontal movement.
Highlights
Cone-beam computed tomography (CBCT) has been widely used in dentistry since its introduction to dentistry in 1998 [1]
Rendered surface models with head motion were similar to the control model in appearance; the landmark identification errors showed larger values in models with head motion than in the control
Patient movement during CBCT scan might cause landmark identification errors on the 3D surface model in relation to the direction of the scanner rotation. Clinicians should take this into consideration to prevent patient movement during CBCT scan, horizontal movement
Summary
Cone-beam computed tomography (CBCT) has been widely used in dentistry since its introduction to dentistry in 1998 [1]. CBCT scan data are obtained during a single rotation of the source-detector around the patient’s head. Projection images taken from different angles are reconstructed to form threedimensional (3D) volume data through modification of the original cone-beam algorithm developed by Feldkamp [10]. When a patient moves during the CBCT scan, misregistration of data voxels occurs, which can influence the reconstruction process of all projection data and presents as shading or streaking in the reconstructed image [11]. Donaldson et al [13] assessed 200 CBCT scans taken between 2008 and 2010 in Glasgow Dental Hospital and School. The authors found increased motion artifacts in the patients under 16 years and above 65 years of age
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