Direct estimation of aberrating delays in pulse‐echo imaging systems

1990 ◽  
Vol 88 (1) ◽  
pp. 191-198 ◽  
Author(s):  
Daniel Rachlin
Keyword(s):  
Imaging Systems ◽  
Direct Estimation ◽  
Pulse Echo

The direct estimation of sound speed using pulse–echo ultrasound

1998 ◽  
Vol 104 (5) ◽  
pp. 3099-3106 ◽  
Author(s):  
Martin E. Anderson ◽  
Gregg E. Trahey
Keyword(s):  
Sound Speed ◽  
Direct Estimation ◽  
Pulse Echo

Modeling and Computer Simulation of Ultrasound Imaging Systems and Human Tissues

1988 ◽  
Vol 10 (4) ◽  
pp. 229-247 ◽  
Author(s):  
Bum S. Lee ◽  
Song B. Park
Keyword(s):  
Imaging System ◽  
Acoustic Velocity ◽  
Imaging Systems ◽  
Inverse Filter ◽  
Axial Resolution ◽  
Gain Function ◽  
Field Patterns ◽  
Temporal Impulse Response ◽  
Dynamic Inverse ◽  
Pulse Echo

A simulator has been developed for an ultrasound linear scan B-mode imaging system. First, a numerical method of calculating field patterns or pulse echo patterns is presented for a full-aperture system with a given transducer geometry in nonattenuating and attenuating media, based on the measured temporal impulse response for a single transducer element immersed in water, and taking into account the variation of attenuation and acoustic velocity in human tissue. The simulator then models and simulates the receiver subsystems in detail using the received pulse echo. In particular, a dynamic inverse filter, to improve the axial resolution, and an unconventional TGC gain function, to reduce the SNR deterioration through logarithmic compression, are proposed. Finally, simulation and experimental results are presented and discussed.

Acoustic microscopy techniques for the inspection of integrated circuit devices and packages

1992 ◽  
Vol 50 (2) ◽  
pp. 966-967
Author(s):  
Thomas M. Moore
Keyword(s):  
Integrated Circuit ◽  
Acoustic Microscopy ◽  
Hybrid Technique ◽  
Frequency Scanning ◽  
Ic Packaging ◽  
Ic Package ◽  
Microscopy Techniques ◽  
Ic Package Inspection ◽  
Pulse Echo ◽  
Scanning Acoustic Microscope

In the last decade, a variety of characterization techniques based on acoustic phenomena have come into widespread use. Characteristics of matter waves such as their ability to penetrate optically opaque solids and produce image contrast based on acoustic impedance differences have made these techniques attractive to semiconductor and integrated circuit (IC) packaging researchers.These techniques can be divided into two groups. The first group includes techniques primarily applied to IC package inspection which take advantage of the ability of ultrasound to penetrate deeply and nondestructively through optically opaque solids. C-mode Acoustic Microscopy (C-AM) is a recently developed hybrid technique which combines the narrow-band pulse-echo piezotransducers of conventional C-scan recording with the precision scanning and sophisticated signal analysis capabilities normally associated with the high frequency Scanning Acoustic Microscope (SAM). A single piezotransducer is scanned over the sample and both transmits acoustic pulses into the sample and receives acoustic echo signals from the sample.

Digital imaging and quantitative image analysis of polymer blends

1996 ◽  
Vol 54 ◽  
pp. 170-171
Author(s):  
Xiao Zhang
Keyword(s):  
Digital Imaging ◽  
Imaging Techniques ◽  
Imaging Systems ◽  
Polymer Science ◽  
Key Factors ◽  
Multiple Imaging ◽  
Quantitative Image ◽  
Digital Imaging Systems ◽  
Multi Phase ◽  
Network Technologies

Polymer microscopy involves multiple imaging techniques. Speed, simplicity, and productivity are key factors in running an industrial polymer microscopy lab. In polymer science, the morphology of a multi-phase blend is often the link between process and properties. The extent to which the researcher can quantify the morphology determines the strength of the link. To aid the polymer microscopist in these tasks, digital imaging systems are becoming more prevalent. Advances in computers, digital imaging hardware and software, and network technologies have made it possible to implement digital imaging systems in industrial microscopy labs.

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