대한구강악안면방사선학회

Korean Academy of Oral and Maxillofacial Radiology

학회지

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Orthopantomograph에 있어서 상층면적에 관한 연구
저자 : 최종호, 김재덕
1991년|21권 1호|Page : 137-143|조회수 297
Full Text : 1991_137.pdf (331.0K)
TI : A Study of the Focal Trough in Orthopantomograph

 AU : Choi CH; Khim JD
 AD : Department of Maxillofacial Radiology . School of Dentistry, Chosun University
 SO : JKAOMFR. 1991;21(1):137-143
 ISSN : 1225-049X
 PY : 1990
 LA : KOREAN
 CP : KOREA

 AB : In the study of the focal trough of panoramic radiograph using Panoura Eight-S (the Yoshida company), a series of 63 X-ray films were taken with the 8-19 metal pins placed in the holes of the plastic model plate and evaluated by 4 observers. The author analized the focal trough defined by the sharpness criteria and calculated dimension of focal trough in the horizontal plane.
 The results were as follows;
 1. Focal trough was not continued in the anterior region within a very high degree of sharpness.
 2. With optional sharpness, the width of anterior and posterior focal trough was approximately 13mm and 60mm respectively.
 3. The focal trough was narrow in the anterior region and was flared laterally with symmetry in posterior region.
 4. Sharp image began to show at the position of 18mm posteriorly from the most anterior position of chin rest.

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