INVIVO FETAL ULTRASOUND EXPOSIMETRY

被引：11

作者：

DAFT, CMW

SIDDIQI, TA

FITTING, DW

MEYER, RA

OBRIEN, WD

机构：

[1] UNIV CINCINNATI,COLL MED,DEPT OBSTET & GYNECOL,DIV MATERNAL FETAL MED,CINCINNATI,OH 45267

[2] UNIV CINCINNATI,COLL MED,DEPT PEDIAT,CINCINNATI,OH 45267

[3] NDE SYST INC,GOLDEN,CO 80401

[4] UNIV ILLINOIS,DEPT ELECT & COMP ENGN,URBANA,IL 61801

[5] CHILDRENS HOSP MED CTR,DEPT PEDIAT,DIV CARDIOL,CINCINNATI,OH 45229

[6] CHILDRENS HOSP MED CTR,CARDIAC ULTRASOUND LAB,CINCINNATI,OH 45229

来源：

IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL | 1990年 / 37卷 / 06期

基金：

美国国家卫生研究院;

关键词：

D O I：

10.1109/58.63105

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

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. Previous work has been based on intensities measured in water, and estimates of tissue attenuation. The ultrasonic field is sampled using a calibrated 7-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 Isptp Isptp and Isptp are computed. Further analysis allows the frequency-dependent tissue attenuation to be assessed. © 1990, IEEE

引用

页码：501 / 505

页数：5

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