METHOD FOR MEASUREMENT OF DYNAMIC RANGE OF RADIODIAGNOSTIC APPARATUSES AND GRADATION WEDGE FOR ITS REALIZATION Russian patent published in 2002 - IPC

FIELD: medical X-ray equipment, in particular devices for determination of technical characteristics of radiodiagnostic apparatuses. SUBSTANCE: the method consists in successive stepped attenuation of the flux of X-radiation by one and the same fixed value relative to the level of attenuation of the of the previous step with the aid of an n-stepped element made of material absorbing the x-radiation, before each stepped attenuation of the flux of x-radiation a complete overlap of it is accomplished. The value of variation of the electric signal averaged for each step of attenuation of the flux of x-radiation corresponding to each stepped variation is measured, and the limit of the range of variation of the value of attenuation of the x-radiation flux at which the preset difference of intensity in the X-ray image is observed is judged by the minimum and maximum values of attenuation of the x-radiation flux, for which the value of variation of the averaged electric signal at a stepped attenuation of the x-radiation flux will be not lower than the threshold value. EFFECT: enhanced accuracy of measurement of the dynamic range of radiodiagnostic apparatuses. 3 cl, 2 dwg