Abstract
In recent years the apprication field of digital subtraction angiography (DSA) is expanding. Following are the results of some of the technical problems discussed in connection with the clinical utilization of DSA. 1. After installation of DSA system, the measured brightness of C-arm type Toshiba image intensifier was Gx=0.36. 2. For removal purpose, the scattered radiation air gap method was used instead of grid in which a 15 cm distance was adequate between the patient and the image intensifier. As a consequence, the radiation exposure dose was 30% less than that of using a grid ratio 10 : 1,and the heat load on the X-ray tube was reduced as well. 3. Spatial and contrast resolution of DSA unit were measured using DSA phantom by an image matrix of 512×512. The former was limited to 1 lp/mm of lead bars and the latter, 1 mg/cm^2 of iodine density.
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