Patent ID: 8077826

Claim:
A method for CT imaging of a subject while correcting for scattered radiation, the method comprising: a. providing a CT scanner comprising at least a first source of X ray radiation capable of rotating about the subject and a detector capable of receiving radiation that has been attenuated by the subject; b. providing an array of radiation shields, said shields being operative to shield parts of an area of the detector from the X ray source at some source rotation angles and not to shield same parts of the detector area at other source rotation angles of said X ray source; c. irradiating said subject by said first X ray source while the source is rotating about said subject and acquiring X ray data from said detector, wherein X rays received by said detector comprise direct radiation from the source that was attenuated by said subject and scattered radiation that was scattered by said subject, and wherein parts of the detector area are substantially irresponsive to direct radiation and responsive to scattered radiation while they are shielded from said first X ray source by said shields; d. computing scattered radiation data indicative of the part of the X-ray data due to scattered radiation for all parts of the detector area at all rotation angles, said computation being based on data received by parts of the detector area while shaded by said shields; and e. correcting the data acquired by parts of the detector area not shielded by said shields by substantially subtracting said computed scattered radiation data from the total measured data.