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Dentomaxillofacial Radiology, Vol 20, Issue 2 59-64, Copyright © 1991 by British Institute of Radiology
ARTICLES |
E. Honda, N. Yoshino, R. Chiba and T. Sasaki
Department of Dental Radiology and Radiation Research, Faculty of Dentistry, Tokyo Medical and Dental University.
A new type of high sharpness, high speed film was evaluated in combination with rare-earth screens for modulation transfer function, root-mean-square granularity and characteristic curve, and compared with currently available film-screen combinations. The clinical applicability of the new system was also compared on the basis of resolution and the discrimination of anatomical features on radiographs of a skull phantom. The results indicated that the new type film provided a radiograph of higher image quality while at the same time reducing patient dose by about 20% compared with the present rare-earth screen systems, or with no loss of image quality while reducing patient dose by about 50% compared with the present calcium tungstate system.
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