CR撮影における被曝線量の定量化について

抄録

The computed radiography system has been changed by the film-screen system, and x-ray equipment has been changed by the inverter type, which is more stable than the conventional type. However, effective energy and dose differ among the various types of equipment. In this study, we examined the relation of effective energy and dose to tube voltage, in four types of inverter-type x-ray equipment. The relation between effective energy and tube voltage was a quadratic curve. No correlation was found between tube voltage and effective energy, or total filtration. Moreover, although the linearity of the relation between effective energy and dose was good, inclination differed slightly. That is, when a radiograph was taken under the same conditions in each radiography room, dose changed remarkably according to the type of equipment. By correcting for radiation quality and mAs value, it will be possible to standardize patient exposure dose, and quantification of exposure and image quality can be achieved.