DEVICE FOR DETERMINING HEIGHT OF X-RAY PICTURE Russian patent published in 2002 - IPC

FIELD: medical engineering. SUBSTANCE: device has casing manufactured from a material having high atomic weight value. Four coordinate ticks are placed on the base portion. Slit-type collimator having inlet and outlet windows is inside of the casing. The latter one is circular with ρ_o = const. The collimator inlet window is spiral-shaped defined by equation where a and ϕ are pitch and angle of the spiral, respectively. The centers of the spiral and circle are marked with through openings and are positioned at the same vertical axis passing through the point of intersection of straight lines drawn over the apices of the opposite coordinate ticks and where h is the collimator thickness and H is the X- ray picture height. The collimator inlet window wall inclination angle is equal to . Radiopaque scale of X-ray picture height is set on the casing base around the inlet window. EFFECT: enhanced performance of X-ray apparatus. 5 dwg