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AN EXPERIMENTAL STUDY ON THE DETECTABILITY OF DIGITAL RADIOGRAPHIC IMAGES

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Abstract

24°³ÀÇ ¼º°ßÀÇ ÆíÃø ÇϾǰñÀÇ Çظé°ñ³»¿¡ °ñ°á¼ÕÀ» Çü¼ºÇÏ¿© ÀÏ¹Ý ¹æ»ç¼± »çÁø°ú °è¼ö ¹æ
»ç¼± »çÁø, °è¼ö °øÁ¦ ¹æ»ç¼± »çÁøÀ» Æò°¡ÇÏ¿© ´ÙÀ½°ú °°Àº °á·ÐÀ» ¾ò¾ú´Ù.
1. Á¤»ó ³ëÃâ½Ã°£À» ÁÖ¾î ÃÔ¿µÇÑ °æ¿ì °¢°¢ÀÇ Æǵ¶´ÉÀº ÀÏ¹Ý ¹æ»ç¼± »çÁø 78.0%, °è¼ö ¹æ
»ç¼± »çÁø 75.9%, °è¼ö °øÁ¦ ¹æ»ç¼± »çÁø 90.3%·Î °è¼ö °øÁ¦ ¹æ»ç¼± »çÁøÀÌ ¾ÕÀÇ µÎ ¹æ¹ý
¿¡ ºñÇÏ¿© À¯ÀÇÇÏ°Ô ¿ì¼öÇÔÀ» º¸¿´´Ù(p<0.05).
2. Á¤»ó ³ëÃâ½Ã°£ÀÇ ¹ÝÀ» ÁÖ¾î ÃÔ¿µÇÑ °æ¿ì °¢°¢ÀÇ Æǵ¶´ÉÀº ÀÏ¹Ý ¹æ»ç¼± »çÁø 68.4%, °è
¼ö ¹æ»ç¼± »çÁø 67.3%, °è¼ö °øÁ¦ ¹æ»ç¼± »çÁø 69.9%¿´À¸¸ç ¼¼ ¹æ¹ý°£ÀÇ À¯ÀÇÇÑ Â÷ÀÌ´Â ³ª
Ÿ³ªÁö ¾Ê¾Ò´Ù(p>0.05).
3. ¼¼ ¹æ»ç¼± »çÁø¿¡¼­ ¸ðµÎ Á¤»óÀûÀÎ ³ëÃâÀ» ÁÖ¾úÀ» °æ¿ì ¹ÝÀ¸·Î ÁÙÀÎ °æ¿ì¿¡¼­º¸´Ù ´õ
¿ì¼öÇÑ Æǵ¶ °á°ú¸¦ º¸¿´´Ù(p<0.05).
4. °è¼ö °øÁ¦ ¹æ»ç¼± »çÁøÀÇ Æǵ¶´É°ú ÀÏÁ¤±âÁؼ±ÀÇ È¸»öµµÀÇ Ç¥ÁØÆíÂ÷´Â ¼­·Î »ó°ü°ü°è
°¡ ¾ø´Â°ÍÀ¸·Î ³ªÅ¸³µ´Ù(p>0.05).
#ÃÊ·Ï#
The comparative detectability of the artificial defects among conventional radiographs,
digital images and digital subtraction images was evaluated. The artificial defects were
made within spogy bone of 24 unilateral mandibles of adult dogs.
The results were as follows:
1. With normal exposure time, the detectability of digital subtraction radiographs was
90.3% which was statistically significant superior to those of conventional
radiographs(78.0%) and digital images(75.9%)(p<0.05).
2. With half-exposure time, the detectability of conventional radiographs, digital
images and digital subtraction radiographs was 68.4%, 67.3% and 69.9% respectively.
There was no statistical significant difference among the detectability of these
methods(p>0.05).
3. All radiographic images with normal exposure time showed statistically significant
superior detectability to those with half-exposure time(p<0.05).
4. The detectability of digital subtraction radiographs was not linearly related to the
standard deviation of the grey levels of reference line(p<0.05).

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