Imaging Science in Dentistry

Korean Academy of Oral and Maxillofacial Radiology (대한영상치의학회)
권호 표지

A study of panoramic focal trough for the six-year-old child

6세 아동을 위한 파노라마방사선사진 상층의 연구

  • Kim Sang-Yeon (Department of Oral and Maxillofacial Radiology and Oral Science Institute, College of Dentistry, Kangnung National University) ;
  • Cho Hang-Moon (Department of Oral and Maxillofacial Radiology and Oral Science Institute, College of Dentistry, Kangnung National University) ;
  • Han Jin-Woo (Department of Oral and Maxillofacial Radiology and Oral Science Institute, College of Dentistry, Kangnung National University) ;
  • Lee Sul-Mi (Department of Oral and Maxillofacial Radiology and Oral Science Institute, College of Dentistry, Kangnung National University)
  • 김상연 (강릉대학교 치과대학 구강악안면방사선학교실 및 구강과학연구소) ;
  • 최항문 (강릉대학교 치과대학 구강악안면방사선학교실 및 구강과학연구소) ;
  • 한진우 (강릉대학교 치과대학 구강악안면방사선학교실 및 구강과학연구소) ;
  • 이설미 (강릉대학교 치과대학 구강악안면방사선학교실 및 구강과학연구소)
  • Published : 2004.06.01
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Abstract

Purpose: To make a focal trough (image layer) for an average maxillary dental arch of 6-year-old korean in panoramic radiography. Materials and Methods : Phantom for the maxillary dental arch was designed using intercanine width, intermolar width, tooth size, and interdental spacing to record the data of 6-year-old child. The characteristics of pre-corrected panoramic machine (for adult) was evaluated using the phantom, resolution test pattern for margin of the image layer, and metal ball for the center of the image layer. Panoramic image layer of the child was developed by means of decreasing the speed of film-cassette and positioning the phantom backwards, and then the characteristics of post-corrected panoramic machine (for child) were reevaluated. Results: At post-corrected panoramic image layer, beam projection angles at all interdental areas increased for about 2.6-3.8°, the position of the image layer was shifted toward the rotation center for about 2.5 mm at the deciduous central incisior area. The width of image layer decreased at all areas. Conclusion : Increased beam projection angle will reduce the disadvantage of tooth overlap, and the same form between the center of the image layer and dental arch will improve image resolution.

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