TI : A Study on the Image Magnification in Focal Trough of Orthopantomography Recording
AU : Lee JB; Kim JD
AD : Department of Maxillofacial Radiology . School of Dentistry, Chosun University
SO : JKAOMFR. 1991;21(1):119-125
ISSN : 1225-049X
PY : 1990
LA : KOREAN
CP : KOREA
AB : In the study of magnification of image in the focal trough of panoramic radiography, (Yoshida company Panoura - Eight - s), a series of 63 x-ray films were taken with the 8-19 metal pins placed in the holes of the plastic plate, measured and evaluated by 4 observes. The author analyzed the vertical and horizontal magnification rate in the corrected focal trough.
Results were as follows:
1. For vertial measurements, magnification rates were minimum 10% maximum 36% and the magnification for image of medial side was larger than that of image of lateral side from image layer.
2. For horizontal measurements, magnification rates were minimum-14% maximum 46% and images of medial side from focal trough were magnified and images of lateral side from focal trough were retrenched.
3. When moved 10mm downward occlusal layer, interspace was somewhat narrow between the pins and upper sides of pins were horizontally magnified but images of the end parts of pins showed tapered form.
4. When moved 10mm downward from the occlusal layer, opposite images showed overlapping.