X-ray computed tomography apparatus with correction for beam hardening

摘要: In an X-ray computed tomography apparatus having a radiation filter, patient attenuation value representative of the linear beam by under examination is determined in equation containing correction function. The function first determining set reference overall values that, for given different thicknesses material and filter arrangement, represent actual two materials. Then, appertaining error each value. Subsequently, variable defined changes direction transverse to straight lines constant characteristic field error. data about dependent on are determined, representing curve along placed into field.