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A STUDY ON THE READABILITY OF PERIAPICAL RADIOGRAPH WITH THE DIGITAL RADIOGRAPHY

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Abstract

ºñµð¿À»çÁø±â¸¦ ÀÌ¿ëÇÑ digital radiography ÀåÄ¡¸¦ ½ÇÇèÀûÀ¸·Î Á¦ÀÛÇÏ¿© ÀÌ ÀåÄ¡ÀÇ ÀÓ»ó
ÀûÀÀ¿ë¿¡ ´ëÇÑ ±Ù°Å¸¦ ¸¶·ÃÇÏ°íÀÚ º» ¿¬±¸¸¦ ½ÃÇàÇÏ¿´´Ù. ¿¬±¸ÀåÄ¡´Â IBM-PC/AT ȣȯ±â
Á¾°ú ºñµð¿À»çÁø±â PV-52OD(Panasonic Co., Japan) ¹× ¾Æ³¯·Î±×-µðÁöÅ» º¯È¯±â Iow cost
Frame Grabber DT2853 (DATA Translation Co., U.S.A.)·Î ±¸¼ºµÇ¾úÀ¸¸ç Çػ󵵴 512¡¿
512, °èÁ¶µµ´Â µðÁöÅ»¿µ»ó Æǵ¶½Ã¿¡´Â 64 ´Ü°è, °èÁ¶µµ ÃøÁ¤½Ã´Â 256 ´Ü°èÀ̾ú´Ù.
¿¬±¸Àç·á·Î¼­´Â °¨±¤µµ E±º(Ektaspeed EP-21, Kodak Co., U.S.A.)ÀÇ X¼±Çʸ§À» ÀÌ¿ëÇÏ¿´
À¸¸ç, À̵é X¼±Çʸ§¿¡ ¿©·¯ ´Ü°èÀÇ X ¼±Á¶»ç½Ã°£À» Àû¿ëÇÏ¿© ¾òÀº X¼±»çÁøÀ» µðÁöÅ»¿µ»óÀ¸
·Î º¯È¯½ÃÄÑ ÀÌÀÇ ¿µ»óºÐ¼®À» ÇÏ¿´À¸¸ç, X¼±»çÁø°ú µðÁöÅ»¿µ»óÀÇ Æǵ¶´ÉÀ» Æò°¡ÇÏ¿© ´ÙÀ½°ú
°°Àº °á°ú¸¦ ¾ò¾ú´Ù.
1. X¼±»çÁø°ú µðÁöÅ»¿µ»óÀÇ Æǵ¶´ÉÀº ÀûÁ¤ X¼±Á¶»ç½Ã¿¡´Â ¾çÀÚ°£ÀÇ ¶Ñ·ÇÇÑ Â÷ÀÌ´Â ¾ø¾ú
À¸³ª, X¼±À» ÀúÁ¶»çÇÑ °æ¿ì¿¡´Â X¼±»çÁøÀÌ, X¼±À» °úÁ¶»çÇÑ °æ¿ì¿¡´Â µðÁöÅ»¿µ»óÀÇ °ÍÀÌ
¿ì¼öÇÏ¿´´Ù.
2. X¼±Á¶»ç½Ã°£ÀÌ Áõ°¡µÊ¿¡ µû¶ó µðÁöÅ»¿µ»óÀÇ °èÁ¶µµ´Â ºñ·ÊÀûÀ¸·Î °¨¼ÒµÇ¾ú´Ù.
3. X¼±Á¶»ç½Ã°£ÀÇ º¯È­¿¡ µû¸¥ °ü½É¿µ¿ª°ú aluminum step wedgeÀÇ °èÁ¶µµ°£ÀÇ »ó°ü°ü°è
´Â R=0.9965(p<0.001)·Î ¸Å¿ì ¹ÐÁ¢ÇÑ °ÍÀ¸·Î ³ªÅ¸³µ´Ù.
ÀÌ»óÀÇ ½ÇÇè°á°úµé·ÎºÎÅÍ º» ½ÇÇè¿¡¼­ Á¦ÀÛµÈ DRÀåÄ¡°¡ X¼±»çÁøÀÇ Æǵ¶°ú ÈæÈ­µµ º¯È­
°üÂû ¹× °ñ¹«±âÁú ÇÔ·®ÀÇ Á¤·®ºÐ¼®µî¿¡ ÀÀ¿ëµÉ ¼ö ÀÖÀ½À» ¾Ë ¼ö ÀÖ¾ú´Ù.
#ÃÊ·Ï#
This investigation was performed to test the readability of the video based digital
radiography, that can be applied clinically, compared with the periapical radiograph.
The experiments were performed with IBM-PC/AT compatible, video camera and
ADC(analog-digital converter). And spatial resolution was 512 ¡¿ 480 with 256 (8 bit)
gray levels.
The radiographs obtained by using variable steps of exposure time were digitized and
then the digital images were analyzed.
The obtained results were as follows:
1. There was no remarkable difference in readability between the radiographs and
their digital images. However, under over exposure the digital images were superior to
the radiographs in readability and vice versa.
2. As the exposure time was increased, the gray level of the digital image was
decreased proportionally.
3. The correlation between the regions of interest and the aluminum step wedges
were relatively close; R=0.9965(p<0.001).

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