Patent ID: 7968853

Claim:
A radiation detector comprising: a two-dimensional array of first scintillators, disposed facing an x-ray source to receive radiation therefrom, convert lower-energy radiation into visible light and transmit higher energy radiation; a two-dimensional array of second scintillators disposed adjacent the first scintillators distally from the x-ray source to convert the transmitted higher energy radiation into visible light; a first array of light sensitive elements, each light sensitive element of the first array being optically coupled to a side face of a corresponding first scintillator, each light sensitive element of the first array having an active area which is larger than the side face of the corresponding first scintillator such that the active area of each first light sensitive element faces the side face of the corresponding first scintillator and a portion of a side face of one of the second scintillators; and a second array of light sensitive elements, each light sensitive element of the second array being optically coupled to a portion of the side face of a corresponding second scintillator to view visible light therefrom and convert the visible light into electrical signals indicative of the higher energy radiation; a first filter between the active area of each first light sensitive element and the corresponding first scintillator, the first filter transmitting light of a wavelength emitted by the first scintillators to the active face of the corresponding first light sensitive element and restricting light emitted by the second scintillators from being received by the active area of the first light sensitive elements such that the first light sensitive elements convert the received light from the first scintillators to electrical signals indicative of the lower energy radiation.