Patent ID: 7440550

Claim:
A collimator comprising: a pair of first plate members, each first plate member having X-ray absorbability and movable in a direction parallel to an end surface thereof, each first plate member comprising an inner surface such that an X-ray passing aperture is defined by a space between the inner surfaces of the first plate members; and a pair of second plate members, each second plate member having X-ray absorbability and comprising a top surface and an opposite bottom surface, each second plate member top surface connected to an outer surface of a respective first plate member via a hinge in order to block X-rays other than the X-rays passing through the X-ray passing aperture, each second plate member supported on a first end and an opposite second end such that each second plate member is movable obliquely in relation to movement of the respective first plate member and such that each second plate member moves with movement of the respective first plate member.