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Development and evaluation of a CMOS sensor-based digital intra-oral radiographic system

Authors
 Soonil Hong  ;  Haijo Jung  ;  Kee-Deog Kim  ;  Su-Gil So  ;  Jong-Ho Kim  ;  Sun Kook Yoo  ;  Hyung Sik Yoo  ;  Hee-Joung Kim 
Citation
 IEEE TRANSACTIONS ON NUCLEAR SCIENCE, Vol.52(1) : 256-261, 2005 
Journal Title
 IEEE TRANSACTIONS ON NUCLEAR SCIENCE 
ISSN
 0018-9499 
Issue Date
2005
Abstract
As part of an ongoing investigation into the development of a dental digital radiographic (DDR) system using a complementary metal-oxide semiconductor (CMOS) sensor, this study developed hardware and software with a graphical user interface to acquire and display intra-oral images from a prototype DDR system. The aim of this study was to develop a DDR system using a CMOS sensor and evaluate its characteristics. Electrical signals that were generated by the CMOS sensor were transformed into digital images by a control computer equipped using a USB board. The distance between the X-ray tube and the CMOS sensor was adjusted within the range of 10-40 cm to provide the optimal image quality. In order to evaluate the image quality according to variations in the dose, phantom images (60 kVp, 7 mA) were obtained at exposure times of 0.03, 0.05, 0.08, 0.10, and 0.12 s, and the signal-to-noise ratio (SNR) was calculated from the phantom image data. The modulation transfer function (MTF) was obtained from a Fourier transform of the line spread function, which was itself derived from the edge spread function of a sharp edge image acquired using the exposure conditions of 60 kVp, 7 mA, and 0.08 s exposure time. The best contrast and focus were obtained at 20 cm. The SNR level was found to increase with increasing exposure time ranging from 0.03 to 0.08 s. The results obtained at 10% of the MTF showed that the resolution of the DDR system was approximately 6.2 line pairs per millimeter. The characteristics of the prototype DDR system have potential applications in intra-oral dental radiographic imaging. The fully developed DDR system can be used for making a clinical diagnosis with further improvements in the acquisition time and spatial resolution.
Full Text
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=1417138
DOI
10.1109/TNS.2004.843167
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Advanced General Dentistry (통합치의학과) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Medical Engineering (의학공학교실) > 1. Journal Papers
Yonsei Authors
Kim, Kee Deog(김기덕) ORCID logo https://orcid.org/0000-0003-3055-5130
Kim, Hee Joung(김희중)
Yoo, Sun Kook(유선국) ORCID logo https://orcid.org/0000-0002-6032-4686
Yoo, Hyung Sik(유형식)
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/147403
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