Imaging Sci Dent.  2016 Jun;46(2):133-139. 10.5624/isd.2016.46.2.133.

The impact of reorienting cone-beam computed tomographic images in varied head positions on the coordinates of anatomical landmarks

Affiliations
  • 1Department of Oral and Maxillofacial Radiology, Yonsei University, College of Dentistry, Seoul, Korea. sshan@yuhs.ac rari98@yuhs.ac

Abstract

PURPOSE
The aim of this study was to compare the coordinates of anatomical landmarks on cone-beam computed tomographic (CBCT) images in varied head positions before and after reorientation using image analysis software.
MATERIALS AND METHODS
CBCT images were taken in a normal position and four varied head positions using a dry skull marked with 3 points where gutta percha was fixed. In each of the five radiographic images, reference points were set, 20 anatomical landmarks were identified, and each set of coordinates was calculated. Coordinates in the images from the normally positioned head were compared with those in the images obtained from varied head positions using statistical methods. Post-reorientation coordinates calculated using a three-dimensional image analysis program were also compared to the reference coordinates.
RESULTS
In the original images, statistically significant differences were found between coordinates in the normal-position and varied-position images. However, post-reorientation, no statistically significant differences were found between coordinates in the normal-position and varied-position images.
CONCLUSION
The changes in head position impacted the coordinates of the anatomical landmarks in three-dimensional images. However, reorientation using image analysis software allowed accurate superimposition onto the reference positions.

Keyword

Cone-Beam Computed Tomography; Anatomic Landmarks; Orthodontics

MeSH Terms

Anatomic Landmarks
Cone-Beam Computed Tomography
Gutta-Percha
Head*
Imaging, Three-Dimensional
Orthodontics
Skull
Gutta-Percha

Figure

  • Fig. 1 A dry skull fixed to the tripod for cone-beam computed tomography.

  • Fig. 2 Three-dimensional cone-beam computed tomography images corresponding to 5 head positions. A. Normal position (horizontal plane). B. Normal position (sagittal plane). C. Normal position (axial plane). D. Five-degree leftward tilting. E. Five-degree extension. F. Five-degree leftward rotation. G. Five-degree flexion.

  • Fig. 3 Reconstructed three-dimensional cone-beam computed tomography images by OnDemand 3D™.

  • Fig. 4 Twenty landmarks are seen on the reconstructed three-dimensional image.


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