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Dentomaxillofacial Radiology, Vol 27, Issue 3 172-177, Copyright © 1998 by British Institute of Radiology

ARTICLES

The development of a new direct digital extra-oral radiographic system prototype using a thin-film transistor panel

T. Sakurai, T. Matsuki, K. Nakamura, I. Kashima, D. L. Lee, L. K. Cheung and L. S. Jeromin
Department of Oral and Maxillofacial Radiology, Kanagawa Dental College, Japan.

OBJECTIVE: To develop a new method of direct digital image acquisition for extra-oral radiography. METHODS: A selenium detector was combined with a thin-film transistor sensor and integrated with current technology for computed radiography in a system named Direct Radiography (DR). The effective image area of the prototype is 178 mm x 213.5 mm, and consists of a 1280 x 1536 pixel matrix with a pixel pitch of 139 microns x 139 microns. The electrical characteristics were evaluated and image quality was tested with a dried human mandible and half-skull phantom. The resultant images were subjectively reviewed by seven oral and maxillofacial radiologists. RESULTS: The prototype had a signal-to-noise ratio of 400:1 when the exposure was 250 x 10(-8) C/Kg. Spatial resolution was equal to the Nyquist frequency of 3.55 cycles/mm. The images of the phantoms were considered to be of equivalent quality to conventional screen-film images and demonstrated the normal anatomical structures used for clinical evaluation. Three to four images per minute were generated with this system. CONCLUSION: The DR system has an X-ray sensitivity comparable with a 400-speed film-screen system and appears suitable for clinical radiography. Further evaluation is therefore planned.




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Copyright © 1998 by the British Institute of Radiology.