1986 Volume 42 Issue 2 Pages 252-257
It is said that Fuji Computed Radiography (FCR), a new radiographic system, offers more improved information suitable for diagnosis and insures less exposure to radiation when compared to the conventional X-ray system. We performed an experimental study to elucidate the relation of the visibility on the tonal conversion images with the exposure and processing factors, and compared the visibility between FCR image and the conventional screen/film image by making a visibility curve.The results obtained are as follows : l) The best visibility on the FCR images was obtained when the latitude was 1.0 and a better visibility was obtained in the following order of latitude : 0.5. 2.0, and 3.6 in the image processing. 2) The FCR image which had the same visibility as the conventional screen/film image could be obtained by oneヴhirds exposure dosage (0.5 mR) of that required for the latter. However, increasing the dosage to the levels higer than 0.5 mR did not improve the visibility of the FCR images. 3) The visibility on the FCR image was inversely correlated with the tube voltage as was in the conventional screen/film system.