Patent ID: 7082189

Claim:
An X-ray distribution adjusting filter apparatus for adjusting a distribution of penetration intensity of X-rays emitted from an X-ray source and expanding in a predetermined shape outward from center axis of the X-rays, said X-ray distribution adjusting filter apparatus comprising: a curved face having a predetermined curvature along said center axis; an X-ray absorbing portion formed of an X-ray absorbing material, wherein said distribution of the penetration intensity of X-rays is adjusted by varying a shape of said X-ray absorbing portion of the X-ray distribution adjusting filter apparatus; a fixed section including a base portion uniform in thickness along said center axis, and inclined portions linked to or formed integrally with the base portion, symmetrically formed about said center axis and on both sides of said center axis, and each having an inclined face with a predetermined inclination relative to a flat face of said base portion; first and second movable sections formed on both sides of said center axis, each configured to pass said center axis and to be tiltable on a plane orthogonal to said center axis, pivoting on a center point, which is the position where one-side ends of said inclined faces of said fixed section are coupled, and having a flat face positioned on the side opposite to said inclined faces of said fixed section and a curved face opposite to the flat face; and first and second deformable sections having opposite ends each opposite to said coupling position of each of said inclined faces of said fixed section, and expansible means disposed between the ends of said flat faces of said first and second movable sections, opposite to the opposite ends, and expanding or contracting according to the pivoting of said first and second movable sections, in which cavities defined by said inclined faces of said fixed section, said flat faces of said movable sections and said expansible means are filled with fluid to keep the insides of said cavities in a filled state, wherein said fixed section and said movable sections are formed of an X-ray absorbing material to constitute said X-ray absorbing portion.