NDLI: In-vivo fetal ultrasound exposimetry

Content Provider	IEEE Xplore Digital Library
Author	Daft, C.M.W. Siddiqi, T.A. Fitting, D.W. Meyer, R.A. O'Brien Jr., W.D.
Copyright Year	1986
Abstract	An instrument has been developed to measure the acoustic pressure field in vivo during an obstetric ultrasound examination. This provides for improved intensity values for exposure calculations, to assist in assessment of bioeffects. The ultrasonic field is sampled using a calibrated seven-element linear array hydrophone of poly(vinylidene difluoride) transducers, which is placed as close as possible to the ovary, embryo, or fetus using a vaginal approach. The RF signals from the hydrophone are digitized at 50 MHz, and the maximum amplitude waveform received in the examination is recorded. The output of the clinical B-scanner is calibrated by a measurement with the hydrophone in a water bath. From the hydrophone measurements, the in vivo I/sub SPTA/, I/sub SPTP/, and I/sub SPPA/ are computed. Further analysis allows the frequency-dependent tissue attenuation to be assessed.<>
Page Count	5
File Size	644983
Starting Page	501
Ending Page	505
File Format	PDF
ISSN	08853010
Volume Number	37
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1990-11-01
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 Sonar equipment In vivo Ultrasonic transducer arrays Instruments Acoustic measurements Pressure measurement Ultrasonic variables measurement Acoustic transducers Ultrasonic transducers
Content Type	Text
Resource Type	Article
Subject	Acoustics and Ultrasonics Instrumentation Electrical and Electronic Engineering

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