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Reproducibility of landmark identification on different CT images of the head in three-dimensional cephalometry

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Abstract
Cephalometry is the scientific measurement of the head and is a widely used technique in orthodontics and craniofacial surgery. In a previous study, a new method for three-dimensional computed tomography (3D CT) cephalometry was investigated, in which landmarks are semi-automatically calculated from a 3D triangulated surface model of the skull. It was shown that high intra- and interobserver reproducibility can be achieved when several analyses are performed on the same 3D model. However, when the head is oriented in a different way during CT scanning, a different triangulated surface will be obtained. Therefore, the reproducibility of landmark identification on different CT images of the patient's head was studied. Pre- and postoperative images were used to construct two triangulated models of the skull, a registration procedure was carried out to orient them in the same way and 15 landmarks, situated on the non-operated part of the skull, were calculated. The effect of the altered orientation during scanning was investigated by calculating the distances between the pre- and postoperative landmarks. The mean distance over 12 patients and 15 landmarks varies between 0.60 and 0.67 mm, depending on the number of smoothing iterations applied on the surfaces. For 10 smoothing iterations, the mean distance over the patients varies between 0.20 and 1.33 mm (mean = 0.60 mm) and the maximum distance over the patients varies between 0.33 and 3.57 mm (mean = 1.33 mm). These variations should be kept in mind when comparing pre- and postoperative data of patients treated with craniofacial surgery.

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Chicago
Van Cauter, Sofie, Walter Okkerse, Guy Brijs, Matthieu De Beule, Benedict Verhegghe, and Marc Braem. 2010. “Reproducibility of Landmark Identification on Different CT Images of the Head in Three-dimensional Cephalometry.” In Proceedings of the Ninth International Symposium on Computer Methods in Biomechanics and Biomedical Engineering, ed. John Middleton, Sam L Evans, Cathy Holt, Christopher Jacobs, Brian Walker, and Carlos Atienza. ARUP.
APA
Van Cauter, S., Okkerse, W., Brijs, G., De Beule, M., Verhegghe, B., & Braem, M. (2010). Reproducibility of landmark identification on different CT images of the head in three-dimensional cephalometry. In J. Middleton, S. L. Evans, C. Holt, C. Jacobs, B. Walker, & C. Atienza (Eds.), Proceedings of the ninth international symposium on computer methods in biomechanics and biomedical engineering. Presented at the 9th International symposium on Computer Methods in Biomechanics and Biomedical Engineering, ARUP.
Vancouver
1.
Van Cauter S, Okkerse W, Brijs G, De Beule M, Verhegghe B, Braem M. Reproducibility of landmark identification on different CT images of the head in three-dimensional cephalometry. In: Middleton J, Evans SL, Holt C, Jacobs C, Walker B, Atienza C, editors. Proceedings of the ninth international symposium on computer methods in biomechanics and biomedical engineering. ARUP; 2010.
MLA
Van Cauter, Sofie et al. “Reproducibility of Landmark Identification on Different CT Images of the Head in Three-dimensional Cephalometry.” Proceedings of the Ninth International Symposium on Computer Methods in Biomechanics and Biomedical Engineering. Ed. John Middleton et al. ARUP, 2010. Print.
@inproceedings{1153134,
  abstract     = {Cephalometry is the scientific measurement of the head and is a widely used technique in orthodontics and craniofacial surgery. In a previous study, a new method for three-dimensional computed tomography (3D CT) cephalometry was investigated, in which landmarks are semi-automatically calculated from a 3D triangulated surface model of the skull. It was shown that high intra- and interobserver reproducibility can be achieved when several analyses are performed on the same 3D model. However, when the head is oriented in a different way during CT scanning, a different triangulated surface will be obtained. Therefore, the reproducibility of landmark identification on different CT images of the patient's head was studied. Pre- and postoperative images were used to construct two triangulated models of the skull, a registration procedure was carried out to orient them in the same way and 15 landmarks, situated on the non-operated part of the skull, were calculated. The effect of the altered orientation during scanning was investigated by calculating the distances between the pre- and postoperative landmarks. The mean distance over 12 patients and 15 landmarks varies between 0.60 and 0.67 mm, depending on the number of smoothing iterations applied on the surfaces. For 10 smoothing iterations, the mean distance over the patients varies between 0.20 and 1.33 mm (mean = 0.60 mm) and the maximum distance over the patients varies between 0.33 and 3.57 mm (mean = 1.33 mm). These variations should be kept in mind when comparing pre- and postoperative data of patients treated with craniofacial surgery.},
  author       = {Van Cauter, Sofie and Okkerse, Walter and Brijs, Guy and De Beule, Matthieu and Verhegghe, Benedict and Braem, Marc},
  booktitle    = {Proceedings of the ninth international symposium on computer methods in biomechanics and biomedical engineering},
  editor       = {Middleton, John and Evans, Sam L and Holt, Cathy and Jacobs, Christopher and Walker, Brian and Atienza, Carlos},
  isbn         = {9780956212139},
  language     = {eng},
  location     = {Valencia, Spain},
  pages        = {6},
  publisher    = {ARUP},
  title        = {Reproducibility of landmark identification on different CT images of the head in three-dimensional cephalometry},
  year         = {2010},
}