Patent ID: 6731716
Filing Date: 2004-05-04
Classification: A61B

Abstract:
An X-ray CT apparatus comprising:a large number of X-ray sources arranged around an object of inspection; a detector for detecting X rays emitted from the X-ray sources; and collimators for restricting the X rays, which are emitted from said X-ray sources and which are not applied to a detection surface of said detector, by being located between said X-ray sources and said object of inspection; wherein said collimators have through holes that are formed as: sin&it;â€ƒ&it;Ï†&LessFullEqual;k&CenterDot;sin&it;â€ƒ&it;(Ï€n)K2+k2+2&it;Kk&CenterDot;cos&it;â€ƒ&it;(Ï€n)where K is the distance from the central axis of a concentric circle composed of said large number of X-ray sources to a starting point at which the X-ray sources emit the X rays, k is the distance from said central axis to an inner surface of the detector including a large number of detection elements arranged densely for detecting the X rays in the shape of a concentric circle having said same central axis and capable of detecting the X rays emitted from said X-ray sources, n is the number of X-ray sources to simultaneously apply the X rays, among said large number of X-ray sources, and 2(&phgr;) is the angle of the spread of the X ray emitted from said starting point to said detector.