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EXPERIMENTAL STUDY ON QUANTITATIVE EVALUATION OF FILM-BASED DIGITAL IMAGING SYSTEM

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Abstract

¿ä¾à ¹× °á·Ð
¸ÅŲÅä½Ã ¥± ci ÄÄÇ»ÅÍ, °íÇØ»óµµÀÇ Sony XC 77CCD Ä«¸Þ¶ó, Quickcapture frame
grabber board¸¦ ÀÌ¿ëÇÑ µðÁöÅ» ¿µ»ó½Ã½ºÅÛÀ» Á¦ÀÛÇÏ¿©, 70kVp, BmA, 0.3ÃÊÀÇ ÃÔ¿µ Á¶°ÇÀ¸
·Î ¾Ë·ç¹Ì´½ step wedge¸¦ ÇÔ²² ÃÔ¿µÇÑ Ç¥ÁØÈ­µÈ Ä¡±Ù´ÜÇʸ§À» µðÁöÅ»¿µ»óÈ­ Çؼ­ Á¤·®ºÐ
¼®À» À§ÇØ ¾Ë·ç¹Ì´½ÀÇ ½ÇÁ¦ µÎ²²¿Í µðÁöÅ»¿µ»óÀÇ °èÁ¶µµ°£ÀÇ »ó°ü°ü°è¸¦ º¸¾Ò°í, °ÇÁ¶ÇϾÇ
°ñ¿¡ 15°³ÀÇ º´¼Ò¸¦ Çü¼ºÇÏ¿© ÃÔ¿µÇÑ Ç¥ÁØÈ­µÈ Ä¡±Ù´ÜÇʸ§À» ¿ª½Ã µðÁöÅ»¿µ»óÈ­ ÇØ»ç ±¸ÇÑ
»ó´ëÀû º´¼Ò üÀû°ú ½ÇÁ¦ Á¦°ÅµÈ °ñ·®°úÀÇ »ó°ü°ü°è¸¦ º¸¾Ò´Ù. ¶Ç ³ëÃâ½Ã°£À» 0.06ÃÊ¿¡¼­
1.0ÃʱîÁö º¯È­¸¦ ÁÖ¾î ÃÔ¿µÇؼ­ ³ëÃâ½Ã°£ÀÇ º¯È­°¡ ¾Ë·ç¹Ì´½ÀÇ µÎ²²¿Í °èÁ¶µµ°£ÀÇ »ó°ü°ü
°è¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» Æò°¡ÇÏ¿©, ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù.
1. ¾Ë·ç¹Ì´½ÀÇ µÎ²²¿Í µðÁöÅ»¿µ»óÀÇ °èÁ¶µµ´Â ³ôÀº »ó°ü °ü°è¸¦ º¸¿´
´Ù.(r2=0.99, p<0.001)
2. ½ÇÇ躴¼ÒÀÇ ½ÇÁ¦ ¹«°Ô¿Í µðÁöÅпµ»óÈ­Çؼ­ Æò°¡µÈ »ó´ëÀû º´¼Ò üÀûÀº ³ôÀº »ó°ü °ü°è
¸¦ º¸¿´´Ù. (r2=0.98, p<0.001)
3. ³ëÃâ½Ã°£ÀÇ º¯È­°¡ ¾Ë·ç¹Ì´½ÀÇ µÎ²²¿Í °èÁ¶µµ°£ÀÇ »ó°ü°ü°è¿¡ ¹ÌÄ¡´Â ¿µÇâÀº ³ëÃâ½Ã°£
ÀÌ Áõ°¡µÉ¼ö·Ï ¾Ë·ç¹Ì´½ÀÇ µÎ²²¿Í °èÁ¶µµ°£ÀÇ Á÷¼±È¸±Í½ÄÀÇ °æ»çµµ°¡ °¨¼ÒÇÏ´Â °æÇâÀÌ ÀÖ¾ú
À¸¸ç(p<0.01). ªÀº ³ëÃâ½Ã°£¿¡¼­ »ó´ëÀûÀ¸·Î ³·Àº »ó°ü°è¼ö¸¦ º¸¿´´Ù.
ÀÌ»óÀÇ ¿¬±¸°á°ú·Î ¹Ì·ç¾î º¸¾Æ ¸ÅŲÅä½Ã ¥±ci ÄÄÇ»ÅÍ¿Í °íÇØ»óµµÀÇ CCD monochrome
Ä«¸Þ¶ó¸¦ ÀÌ¿ëÇÑ µðÁöÅ» ¿µ»ó½Ã½ºÅÛÀº Ç¥ÁØÈ­µÈ Ä¡±Ù´ÜÇʸ§À» µðÁöÅ» ¿µ»óÈ­ÇÏ¿© Á¤·®ÀûÀ¸
·Î Æò°¡Çϴµ¥ À¯¿ëÇÒ °ÍÀ¸·Î ÆǴܵȴÙ.
#ÃÊ·Ï#
A digital imaging system using Mackintosh ¥±ci computer, high resolution Sony
XC-77 CCD camera, Quickcapture Frame Grabber Board was evaluated for quantitative
analysis of standardized periapical film with aluminum step wedge.
The results were as follows:
1. Correlation between Al thickness and gray level was high-positively
associated(r2=0.99, p<0.001).
2. Correlation between measured weight of experimental lesion and estimated relative
lesion volume by digital subtracted radiography was also high-positively
associated(r2=0.98, p<0.001).
3. As exposure time was increased, mean gray level was decreased(p<0.01) and slope
of regression line between Al thickness and gray level was also decreased (p<0.01). And
when the exposure time was shorter than 0.2 second, the value of r2 was
relatively low.
On the basis of the above results, it is considered that this digital imaging system
using a Macintosh ¥± ci computer & a high resolution CCD monochrome camera will be
useful in evaluating digitized image from standardized periapical film quantitatively.

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