Abstract
Laminagraphy is a radiographic technique used to image cross-sectional views through solid objects. Coplanar rotational laminagraphy (CRL) is a special case where the film and object rotate synchronously while the radiation source remains stationary. The orientation of the radiographic film corresponds to the cross-sectional slice through the object being imaged. The image formed on the exposed film is highly blurred owing to the continuous summation of radiographic projections taken at different angles through the object. Theoretical analysis of the image formation process shows that the resultant image is simply a convolution of the ideal cross-sectional image with a radially symmetric point spread function having the form r−1. Direct deconvolution does not give good results since image noise becomes a significant factor owing to the high-frequency amplification of the deconvolution operator. A parametric filter based on the optimized Wiener restoration filter is shown to provide good results for a few selected specimens.
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