Scatterer-Induced Frequency Variations in Reflected Acoustic Pulses: Implications for Tissue Characterization-Reference-Cited by-同舟云学术

Scatterer-Induced Frequency Variations in Reflected Acoustic Pulses: Implications for Tissue Characterization

Published:1985-04 Issue:2 Volume:7 Page:172-178
ISSN:0161-7346
Container-title:Ultrasonic Imaging
language:en
Short-container-title:Ultrason Imaging

Author:

Gehlbach S.M.¹²,Sommer F.G.²,Stern R.A.²

Affiliation:

1. Kesa Corporation 3044 Scott Blvd. Santa Clara, CA 95054

2. Department of Radiology Stanford University School of Medicine Stanford, CA 94305

Abstract

A Hilbert transform approach to the detection of the instantaneous center frequency of reflected ultrasonic pulses was performed for simulated reflected ultrasonic pulses, and digitized ultrasonic waveforms from tissue phantoms. Considerable center frequency modulation was observed for both simulated and recorded ultrasonic waveforms. This phenomenon of frequency modulation can be explained with the aid of a phasor model, in which variations in instantaneous frequency results from the interaction of a multitude of overlapping ultrasonic pulses arising from different scattering centers in tissue. The observed frequency modulation of ultrasonic signals has important implications for tissue characterization techniques, including the measurement of attenuation by the determination of the shift in ultrasonic center frequency.

Publisher

SAGE Publications

Subject

Radiology, Nuclear Medicine and imaging,Radiological and Ultrasound Technology

Link

http://journals.sagepub.com/doi/pdf/10.1177/016173468500700206

Reference9 articles.

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2. Papoulis A., Systems and Transforms with Applications in Optics, p84, (McGraw-Hill, New York, 1968).

3. Carlson A.B., Communication Systems: An Introduction to Signals and Noise in Electrical Communication, p 223, (McGraw-Hill, New York, 1978).

4. On the Behavior of Minimax FIR Digital Hilbert Transformers

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