NDLI: Enhanced ultrasonic imaging with split-spectrum processing and polarity thresholding

Content Provider	IEEE Xplore Digital Library
Author	Bilgutay, N.M. Bencharit, U. Saniie, J.
Copyright Year	1974
Abstract	The polarity thresholding algorithm, which utilizes the frequency decorrelation principle based on the split-spectrum processing technique, is examined. Split-spectrum processing obtains an ensemble of frequency diverse signals from a wideband received signal by using a set of parallel bandpass filters with different center frequencies. Polarity thresholding acts as an on-off switch on the resulting data by setting the output to zero at time instants where the split-spectrum ensemble exhibits polarity reversal. Since the target echo exhibits significantly smaller variation with frequency compared to cluster echoes, polarity thresholding maintains the target echo while suppressing a significant portion of the clutter echos. Theoretical derivations are provided to determine the signal-to-noise ratio enhancement capabilities of the algorithm. Ultrasonic data obtained from large-grained stainless steel samples with flat-bottom holes are used to verify the theoretical results and demonstrate the grain echo suppression capability of the algorithm in imaging applications.<>
Starting Page	1590
Ending Page	1592
Page Count	3
File Size	318795
File Format	PDF
ISSN	00963518
Volume Number	37
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1989-10-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ultrasonic imaging Frequency diversity Signal processing Switches Decorrelation Wideband Band pass filters Filtering theory Signal to noise ratio Clustering algorithms
Content Type	Text
Resource Type	Article
Subject	Signal Processing

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