Patent ID: 7526070
Filing Date: 2009-04-28
Classification: A61B,G21K

Abstract:
1. An X ray computer tomography apparatus comprising: an X ray emitting unit which emits X rays; an X ray detection unit which is placed to face the X ray emitting unit and detects X rays incident to a detection surface; and a collimator unit which is placed on the X ray incident side of an X ray detector to remove scattered X rays and includes a plurality of collimator plates and a support unit, the plurality of collimator plates being arranged along a predetermined direction, and the support unit supporting each of the collimator plates along at least three sides thereof in such a manner that a surface of each of the collimator plates is substantially parallel to an X ray incident direction from the X ray emitting unit to the detection surface; wherein: the support unit includes: a first support member which includes a plurality of first grooves provided along the predetermined direction, each of the first grooves being formed along the X ray incident direction; a second support member which is placed parallel to the first support unit and includes a plurality of second grooves provided along the predetermined direction so as to correspond to said plurality of first grooves, each of the second grooves being formed along the X ray incident direction; and a third support member which includes a plurality of third grooves for fitting of detection surface side peripheries of the collimator plates fitted in the first grooves and the second grooves, and is provided on the detection surface side of the plurality of collimator plates; wherein the support unit further comprises a fourth support member which includes a plurality of fourth grooves for fitting of X ray emitting unit side peripheries of the collimator plates fitted in the first grooves and the second grooves, and is provided on the X ray emitting unit side of the plurality of collimator plates.