X-ray examination apparatus and means for noise reduction for use in an x-ray examination apparatus

摘要

Noise reduction means for use in an x-ray examination apparatus is provided for performing weighted temporally averaging in dependence on an amount of motion in parts of successive x-ray images. Further noise reduction is performed by combining temporally averaging with spatially filtering and motion detection. This reduces both noise breakthrough and the occurrence of trailers. In particular noise breakthrough is appropriately reduced by bi-temporal filtering. Threshold-values for discriminating between noise and motion are computed on the basis of images generated by the x-ray detector.