Abstract
In radiographs of the chest, it is difficult to describe the lung and the mediastinum at the proper density on one sheet of film. It seems to us that the use of wide latitude film for chest radiography easily clears up these difficulties. However, its adaptability for chest radiography is discussed in relation to the lack of contrast in the region of the lung and some other problems. We obtained the number of noise-equvalent qunta (NEQ(u)), the detectability and the detective quantum efficiency (DQE(u)) through low to high density on wide latitude film and conventional film with the same screen, and investigated the adaptability of these two films to chest radiography by using these characteristic figures. It is possible to evaluate the image quality of screen/film systems by using NEQ(u), the detectability, and DQE(u). The conventional film system is superior than the wide latitude film system in terms of NEQ(u), DQE(u) and detectability in all density regions. Therfore, the conventional film system with a compensating filter or a compensated speed screen is better than the wide latitude film system for the chest radiography.
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