COMPUTERIZED SCATTER CORRECTION IN DIAGNOSTIC-RADIOLOGY

The field of diagnostic radiology continues to generate interesting li nes of physics research even though it is over a century since X-rays were first used for medical imaging. One of these concerns scatter pro cesses which are well known to be a major influence on the quality of X-ray images. The components, effects, reduction and measurement of sc atter and the potential of computerized scatter correction schemes are reviewed in this paper. The effect of scatter on indices of image qua lity is considered using analytical models and published experimental results. Scatter measurement based on the widely applied opaque disc t echnique and a novel aperture technique are discussed in detail. In ad dition, computerized scatter correction based on convolution filtering schemes and interpolated local sampling schemes are critically review ed The treatment focuses on fluoroscopy-fluorography, although extensi ve reference is also made to other radiographic imaging techniques.