Optical EngineeringThree-dimensional information from real-time encoded images
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The real-time neutron radiography facility at the University of Virginia has been used for both transmission radiography and computed tomography. Recently, a coded aperture system has been developed to permit the extraction of three-dimensional information from a low intensity field of radiation scattered by an extended object. A technique was developed to permit retrieval of information by decoding two-dimensional coded aperture images collected with a real-time video system. An RCA video camera and a DEC PDP-1 1 computer in a network with a Convex-i parallel processing mainframe were employed. This system coupled with theoretical extensions and improvements allowed retrieval of information unobtainable by earlier optical methods. The effects ofthermal noise, shot noise, and aperture related artifacts were examined so that better digital filtering techniques could be constructed and implemented. The application and advantages of this imaging technique to the field of thermal neutron imaging are discussed.