Simulation of quantum mottle in digital angiographic images
Cheuk L. Chan, Barry J. Sullivan, Alan Varteres Sahakian, Aggelos K. Katsaggelos, Steven Swiryn, David C. Hueter, Thomas Fröhlich · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1990
A method is described for the computer simulation of quantum mottle in digital angiographic images obtained through an image intensifier (II) based system. The model corrupts a "perfect" image-one taken at high exposure levels-with Poisson distributed noise to simulate an image obtained through a lower x-ray dose. A mapping scheme is employed which effectively correlates gray level intensities at the image display to photon fluence at the front end of the II. The utility of the noise model is demonstrated by using it to simulate the effect of variable x-ray exposure conditions on an angiographic sequence. Such a sequence is valuable in the development of temporal filtering techniques for digital angiography.