X線管焦点寸法の管電流による変化

概要

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At present, the demensiona of focal spot is determined by means of X-ray pin-hole cameras and resolution method. But this method is not practical for routine work. The magnified radiographic image of star test pattern is a useful determination of effective focal spot size. We investigated the change of effective focal spot size by means of the star test pattern method. In the result of experiment, the effective focal spot size is enlarged by increasing milliamperage. But this phenomenon has been expected. The rate of enlargement is different from each Xray tube. This phenomenon is caused by convergence effect of thermoelectron. The effective focal spot size is present the minimum value by milliamperage. When the radiographic image is maked, the milliamperage value must be chosen a minimum effective focal spot size.
Medical Imaging and Information Sciencesの論文