Journal of Korean Academy of Oral and Maxillofacial Radiology (치과방사선)

Korean Academy of Oral and Maxillofacial Radiology (대한영상치의학회)
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A STUDY ON THE READABILITY OF PERIAPICAL RADIOGRAPH WITH THE DIGITAL RADIOGRAPHY

Digital radiography를 이용한 치근단 X선 사진의 판독능에 관한 실험적 연구

  • Lee Kon (Department of Oral Radiology, College of Dentistry, Kyung Hee University) ;
  • Lee Sang Rae (Department of Oral Radiology, College of Dentistry, Kyung Hee University)
  • 이곤 (경희대학교 치과대학 치과방사선학교실) ;
  • 이상래 (경희대학교 치과대학 치과방사선학교실)
  • Published : 1992.06.01
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Abstract

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 X 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 beween the regions of interest and the aluminum step wedges were relatively close; R=0.9965 (p <0.001).

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