Patent ID: 7212611

Claim:
A method for limiting a ray beam in connection with x-ray imaging equipment, in which at least one blade element of a blade mechanism ( 1 ) is moved by means of an actuator ( 3 ) so as to produce a ray beam of a desired form, wherein the method involves use of a blade mechanism ( 1 ) comprising a single primary blade element ( 4 ) and at least one secondary blade element ( 5 , 20 etc.) in such manner that the single primary blade element ( 4 ) is moved independently of any other of said at least one secondary blade elements by means of the actuator ( 3 ), and said at least one secondary blade element ( 5 , 20 etc.) arranged to limit the beam is moved in a manner such that it is driven by the movements of the primary element ( 4 ); and wherein the ray beam is limited by two blade elements, wherein at least one of said blade elements is a secondary blade element.