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A STUDY OF THE FOCAL TROUGH IN ORTHOPANTOMOGRAPH
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ÃÖÀüÈ£(õËï±ûÇ)/Chong-Ho Choi
±èÀç´ö(ÑÑî¤Óì)/Jhai-Dhuck Kim
KMID : 0378219910210010137
Abstract
îÊíº´Â Æijë¶ó¸¶ Û¯ÞÒàÊõÉç¯íûöÇÀÇ ßÀöµØüîÝÀ» æÚϼÇϴµ¥ ÀÖ¾î¼ Panoura-Eight-5(ìíÜâ
Yoshida𲸦 ÞÅéÄÇÏ¿© 8¡19ËÁÀÇ ÐÝáÕÇÉÀ» ²ÈÀº ÇÁ¶ó½ºÆ½ Ù¼úþ÷ùÀ» õÉç¯ÇÑ 63ÀåÀÇ Û¯ÞÒàÊ
ÞÐòØßÀÀ» 4Ù£ÀÇ ÎºóÌíº¿¡°Ô ÷÷ÔÁÀ» ëîÖóÇÑ Ì¿Íý¸¦ ÝÂà°ÇÏ¿© ´ÙÀ½°ú °°Àº Ì¿ÒÕÀ» ¾ò¾ú´Ù.
1. °¡Àå ³ôÀº àØÙ¥Óø¿¡ ëîÇØ ÀÌ·ç¾îÁø ßÀöµ ØüîÝÀº îñÛ°Ý»êÈ¿¡¼ ææáٵǴ ßÀÀ» ³ªÅ¸³»Áö
¾Ê¾Ò´Ù.
2. àØÙ¥Óø°¡ îêï·ÇÑ ßÀÀ¸·Î ÀÌ·ç¾îÁø ßÀöµØüîÝÀº îñÛ°Ý»êÈ¿¡¼ å³ 13§®ÀÌ°í ýÛ°Ý»êÈÀÇ
øëÀº å³ 60§® À̾ú´Ù.
3. ßÀöµØüîÝÀÇ ¸ð¾çÀº îñÛ°Ý»êÈ¿¡¼ Á¼°í ýÛ°Ý»êÈ¿¡¼´Â ¹Ù±ùÂÊÀ¸·Î ¹ú¾îÁ® å»ö°ÀÌ Óßöà
À» ÀÌ·ç¾ú´Ù.
4. îñÛ°Ý»êÈ´Â õÌîñÛ°¿¡¼ å³ 18§® ýÛ°ºÎÅÍ àØÙ¥ÇÑ ßÀÀÌ ³ªÅ¸³µ´Ù.
#ÃÊ·Ï#
In the study of the focal trough of panoramic radiograph using Panoura Eight-5 (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 13 §® and 60 §® 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 18 §®m posteriorly from the most
anterior position of chin rest.
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