OBJECTIVES: The purpose of this study was to evaluate and reduce potential errors associated with superimposition of serial cone-beam computerized tomography (CBCT) images using planes based on cranial base landmarks. METHODS: CBCTs from 10 patients were analyzed. The potential impact of errors in cranial base landmark identification on assessment of the relative position of distant landmarks is mitigated by means of a mathematical algorithm that ensures that the distances and angles between landmark identification points are maintained for different images by readjusting the landmark coordinates. RESULTS: Significant improvement was observed after optimization. The errors found in a previous study were significantly reduced, some by more than 90%. Errors found in the standardization were viewed in both infraorbitals and mentons ranging from 1 to 3 mm. CONCLUSIONS: The mathematical transformation to readjust the coordinates of ELSA, left and right auditory external meatus (AEM), and dorsum foramen magnum (DFM) points significantly improves their use for image superimposition.
OBJECTIVES: The purpose of this study was to evaluate and reduce potential errors associated with superimposition of serial cone-beam computerized tomography (CBCT) images using planes based on cranial base landmarks. METHODS: CBCTs from 10 patients were analyzed. The potential impact of errors in cranial base landmark identification on assessment of the relative position of distant landmarks is mitigated by means of a mathematical algorithm that ensures that the distances and angles between landmark identification points are maintained for different images by readjusting the landmark coordinates. RESULTS: Significant improvement was observed after optimization. The errors found in a previous study were significantly reduced, some by more than 90%. Errors found in the standardization were viewed in both infraorbitals and mentons ranging from 1 to 3 mm. CONCLUSIONS: The mathematical transformation to readjust the coordinates of ELSA, left and right auditory external meatus (AEM), and dorsum foramen magnum (DFM) points significantly improves their use for image superimposition.
Authors: Cecilia Ponce-Garcia; Manuel Lagravere-Vich; Lucia Helena Soares Cevidanes; Antonio Carlos de Olivera Ruellas; Jason Carey; Carlos Flores-Mir Journal: Angle Orthod Date: 2017-11-30 Impact factor: 2.079
Authors: Cecilia Ponce-Garcia; Antonio Carlos de Oliveira Ruellas; Lucia Helena Soares Cevidanes; Carlos Flores-Mir; Jason P Carey; Manuel Lagravere-Vich Journal: Head Face Med Date: 2020-01-27 Impact factor: 2.151