Filter device for hardening X-ray beam transmitted from X-ray radiator of C-arm X-ray device in e.g. surgery of patient, has sections arranged perpendicular to direction and made from materials with different or effective atomic numbers

摘要

The device (10a) has two filter sections (11) arranged perpendicular to a beam direction (13) and made from different materials e.g. aluminum and/or copper and/or titanium and/or gallium and/or tin, with different atomic numbers or effective atomic numbers. A material with a higher atomic number is passed earlier by an X-ray than a material with a lower atomic number. The materials are arranged such that the atomic number of the materials drops along the direction. The sections are designed as a gallium layer (14), a copper layer (15) and a titanium layer (16) of multilayer structure (12).