|University of Illinois at Urbana-Champaign | Department of Electrical and Computer Engineering | Department of Bioengineering
Department of Statistics | Coordinated Science Laboratory | Beckman Institute | Food Science and Human Nutrition | Division of Nutritional Sciences | College of Engineering
|Tuesday, April 24th, 2018|
Edge Detection in Ultrasonic Speckle
In this project, the problem of detecting boundaries in ultrasound speckle imagery is considered. For physiological reasons, we argue that boundaries between tissue layers appear as lines in ultrasound B-scans, and approach the boundary detection problem as one of detecting lines of unknown orientation. We define a set of "sticks," short line segments of variable orientation which can locally approximate the boundaries. Using the physical principles which account for the speckle phenomenon, we derive the optimal detector for sticks of unknown orientation in fully developed speckle, and compare the optimal detector to several sub-optimal detection rules which are more computationally efficient.
The basic technique is then extended in a number of way to improve its performance. We investigate the effect of varying the size and shape of the sticks, and show that these variations affect the performance of th algorithm in very fundamental ways, for example, by making it more or less sensitive to thinner to more tightly curving boundaries. We also present a means of improving performance by estimating the distribution function of the orientation of the line passing through each point. Next, we show that images can be "stained" for easier visual interpretation by applying to each pixel a false color whose hue is related to the orientation of the most prominent line segment at that point. Finally, an analysis is given of the boundary detection approaches in radio frequency ultrasound.
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