Scatter-Glare Estimation for Digital Radiographic Systems: Comparison of Digital Filtration and Sampling Techniques

Abstract

The scatter and veiling glare distribution in images acquired with a digital subtraction angiography imaging system was estimated using a digital filtration and a beam-stop technique. The digital filtration technique utilizes exposure parameters and image gray levels to estimate scatter-glare intensity based on previous phantom measurements. The beam-stop technique uses an array of lead discs in order to sample scatter-glare intensity for each patient. To test the ability of digital filtration and beam-stop techniques to estimate the scatter-glare intensity, they were applied to images of postmortem swine animal models at different projections and beam energies. The systematic and root-mean-square (rms) percentage errors of these estimates were obtained by comparison to directly measured scatter-glare images using a scanning lead strip technique. The average rms percentage error for the digital filtration and beam-stop techniques were 8.07% and 6.67%, respectively. The changes in scatter-glare intensity due to contrast injection during coronary arteriography and ventriculography were also measured using the beam-stop technique. The maximum changes in scatter-glare intensities during coronary arteriography and ventriculography were 19 and 88%, respectively. The results indicate that the digital filtration technique is more suited for applications such as coronary arteriography and ventriculography where the iodinated contrast material significantly changes the scatter-glare intensity.

DOI: 10.1109/42.746621

Cite this paper

@article{Molloi1998ScatterGlareEF, title={Scatter-Glare Estimation for Digital Radiographic Systems: Comparison of Digital Filtration and Sampling Techniques}, author={Sabee Molloi and Yifang Zhou and Greg Wamsely}, journal={IEEE transactions on medical imaging}, year={1998}, volume={17 6}, pages={881-8} }