Adaptive filters for reducing streaky (stripy) artefacts in X-ray tomography images

摘要

Streaky artefacts in a computer tomography (X-ray) image are reduced by adaptively filtering each set of projection data. The adaptive filter produces an error vector ( THETA ) by low-pass filtering the projection data (P) and subtracting the error vector ( THETA ) from the projection data (P) prior to the image reconstruction. A window function generator controls the low-pass filter as a function of the X-ray detector read-outs.