Reconstruction filtering in industrial gamma-ray CT application

Industrial gamma-ray Transmission Computed Tomography (TCT) scanning is used in Single Photon Emission Computed Tomography (SPECT or ECT) imaging to obtain attenuation maps. The knowledge of attenuation due to waste matrix is required to characterize activity level and distribution of gamma emitting radioisotopes inside nuclear waste containers.The attenuation maps are generally noisy due to sparse sampling and less available photon statistics in data collection in SPECT imaging. Image noise and spatial resolution play very important roles in image quality. The problem of noise in TCT is usually handled with the application of low- pass digital filters. No single set of filter parameters stands out as being best for all applications. Each application requires careful study and evaluation of filter parameters to match test constraints and requirements. In this study, effects of filter parameters have been evaluated for Industrial d-ray CT application