• Title/Summary/Keyword: 치과방사선사진

Search Result 644, Processing Time 0.03 seconds

Three-dimensional CT image study on the correction of gonial angle width enlarged on frontal cephalogram (정모두부방사선사진에서 하악골 우각부 영상확대 및 이의 보정에 관한 3차원 CT영상 연구)

  • Hwang, Hyeon-Shik;Eun, Chun-Sun;Hwang, Chung Hyon;Lim, Hoi-Jeong
    • The korean journal of orthodontics
    • /
    • v.35 no.4 s.111
    • /
    • pp.251-261
    • /
    • 2005

  • Enlargement is an inherent property of X-rays which occurs when straight hues diverse from small a focal spot. The purpose of the present study was to evaluate the validity of the correction of gonial angle width enlarged on frontal cephalogram, using frontal and lateral cephalograms taken orthogonally from each other. In 40 adult individuals, frontal and lateral cephalograms were taken at a $90^{\circ}$ angle using the Head Posture Aligner. The angle width was measured on the frontal cephalogram and subsequently. the corrected angle width was calculated using the magnification rate of two cephalograms. Measured and corrected angle widths were compared with the measurement from the 3D CT image. The measurement or the frontal cephalogram showed a 9.10mm of enlargement on average ranging from 7.92 to 11.31mm. Corrected angle width measurement showed a 0.14mm difference with the 3D CT image measurement, which was not statistically significant. The results of the study indicate that actual au91e width can be approached through calculation using frontal and lateral cephalograms taken orthogonally with the help of the Head Posture Aligner The study also showed that the magnitude of correction error did not show a significant correlation with the amount of menton deviation, and it suggests that the present correction method is valid even in individuals with severe facial asymmetry.

  • PDF KSCI