Patent ID: 6711236
Filing Date: 2004-03-23
Classification: A61B,G01N,H05G

Abstract:
An aperture position adjusting mechanism in an X-ray CT system capable of adjusting the position of an aperture, comprising:a pair of rails disposed along a direction in which said aperture is to be adjusted, for slidably mounting said aperture, said aperture having an aperture opening for limiting an X-ray irradiation range; a first shaft that is hollow and is provided with a bore passing in parallel with a center axis of said first shaft at a position offset from said center axis, said first shaft being rotatably supported by a base portion of said aperture orthogonally to said pair of rails; a second shaft that is received and is rotatably supported within said bore of said first shaft; and a driving device for rotating said second shaft in reciprocal directions around an eccentric axis offset from a center axis of said second shaft, said mechanism characterized in that: said aperture is moved along said rails as said second shaft is eccentrically rotated by said driving device and, following said eccentric rotation and in a direction opposite to that of said rotation, said first shaft is eccentrically rotated around the center axis of said bore.