대한구강악안면방사선학회

Korean Academy of Oral and Maxillofacial Radiology

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파노라마방사선사진에 있어서 상층면적에 관한 연구
저자 : 박창서, 김한평
1982년|12권 1호|Page : 115-121|조회수 403
Full Text : 1982_115.pdf (412.2K)
TI : The study of the focal trough in panoramic radiograph

 AU : Park CS; Kim HP
 AD : Department of Dental Science, Graduate School, Yonsei University
 SO : JKAMFR. 1982;12(1):115-121
 ISSN : 1225-049X
 LA : KOREAN
 CP : KOREA

 AB : In the study of the focal trough of panoramic radiograph, using the Moritta company Panex EC a series of 48 exposures were taken with the 6∼18 brass pins placed in the holes of the plastic model plate, then evaluated by 4 observers. The author analyzed the focal trough defined by the sharpness criteria and calculated the vertical and horizontal magnification range in the corrected focal trough.
 The results were as follows;
 1. Continuous focal trough was not defined in the anterior region using a very high degree of sharpness.
 2. As degree of sharpness used in the analysis became less, focal trough was continuous in the anterior and posterior regions, symmetrized bilaterally, and the widths of the focal trough increased more in the posterior region.
 3. As sharpness criteria were reduced, the percentage range of image magnification increased in both vertical and horizontal magnification, and especially the percentage range of horizontal magnification was greater than that of vertical magnification.

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