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Swedish Radiation Protection Institute, Box 60204, S-104 01 Stockholm 1 Department of Radiation Physics, Sahlgren Hospital, S-413 45 Gothenburg, Sweden 2 Department of Radiology, Sahlgren Hospital, S-413 45 Gothenburg, Sweden
A nation-wide study of chest radiography in Sweden had previously revealed a large variation in the physical and technical factors involved, in particular the radiation dose. In this study the image quality could not be assessed unambiguously. The aim of the present study was to try to establish a correlation between visual grading of radiographs and physical and technical factors in order to find the optimum chest X-ray system. The physical and technical performance of 24 chest units was evaluated. Radiographs were taken of an anthropomorphic chest phantom supplied with test structures simulating various pathologies. Image quality was assessed by visual grading analysis of the radiographs. The physical and technical parameters of the units rated best were used to exemplify good radiographic practice. The results were in agreement with the recommendations issued by the Commission of the European Communities (CEC). It was also shown that low radiation dose is compatible with high-quality radiographic imaging of the chest.
Received for publication March 9, 1992. Revision received August 26, 1992. Accepted for publication November 2, 1992.
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