NDLI: The impact of various imaging parameters on ultrasonic displacement and velocity estimates

Content Provider	IEEE Xplore Digital Library
Author	Chen, E.J. Jenkins, W.K. O'Brien Jr., W.D.
Copyright Year	1986
Abstract	The accuracy of displacement and velocity data in ultrasonic motion detection systems depends on a combination of ultrasonic imaging parameters. These include magnitude and direction of target motion, target region dimensions, scattering media, ultrasonic frequency of interrogation, digital sampling frequency, and signal type (envelope detected or RF). Because the impact of scattering media in particular has heretofore received little or no attention, we provide experimental results and computer analysis to evaluate the influence of different scattering media on the accuracy of ultrasonic displacement and velocity estimates using porcine liver, porcine muscle, and woolen sea sponge samples. Our experimental results show that for identical target dimensions and displacements, the accuracy of ultrasonic displacement and velocity estimates in porcine muscle samples are substantially higher than in porcine liver samples. Analysis of experimentally derived autocovariance curves for each tissue type indicates that the improvement in accuracy for muscle samples is not, in fact, due to differences in the speckle characteristics for each tissue type. The improvement is attributed to the presence of well-defined and resolvable image structures from muscle and the lack of such resolvable structures in porcine liver tissue. We provide a summary of the factors impacting ultrasonic displacement and velocity measurements, and discuss why and how a combination of one or more imaging parameters affects these measurements.<>
Starting Page	293
Ending Page	301
Page Count	9
File Size	954911
File Format	PDF
ISSN	08853010
Volume Number	41
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ultrasonic imaging Muscles Scattering Liver Motion detection Frequency Image resolution Velocity measurement Sampling methods RF signals
Content Type	Text
Resource Type	Article
Subject	Acoustics and Ultrasonics Instrumentation Electrical and Electronic Engineering

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