Abstract
Reports of possible uses of a commercially available electro-optical instrument. A filtering technique is applied to remove the disturbing periodic image structures which result from the use of grids in radiography. The removal of these structures is accomplished by placing in the Fourier transform plane a filter which eliminates the transmission of the Fourier spectrum of grid lines. Comparison of the resulting filtered and unfiltered images demonstrates the usefulness of grid line removal from radiographs of simulated blood vessels. The effect of band-pass filtering on cerebral angiograms was studied. It was found that a recognizable blood vessel image results even when the band-pass filter is placed in a spatial frequency range well beyond the frequency at which the Fourier spectrum of the radiographic image would be assumed to be essentially zero.
Published Version
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