X-ray beam collimator

X-ray beam size and shape is defined by the inherent construction of the Tube. The way the target is positioned, the shielding and housing designs are largely influencing the beam cone, but this is fixed and sometimes not adequate to the imaging detector or Shielding environment. The use of a collimator is then very useful when you want to precisely control the cone shape and extent.
The collimator acts as a mobile window reducing or defining the limits of the beam to the detector sizes or portion of area to be covered.
Made out of highly absorbing material, shutters are remotely moved with electric motors operated from the control room.