Biomaterial Database

[Advanced system for real-time fetal breathing movements tracking using pulsed Doppler ultrasound]. 1994

N Shinozuka, and Y Yamakoshi, and T Okai, and Y Taketani

Department of Obstetrics and Gynecology, Faculty of Medicine, University of Tokyo.

Utilization of the fetal behavioral information in clinical medicine requires the development of an automated monitoring technique. As previously reported, the off-line signal processing of the low frequency Doppler signals by high accuracy displacement estimation made it possible to measure fetal breathing movements (FBM). However, there were several problems to solve before clinical application. We propose an advanced system that provides real-time calculation. The multi-channel pulsed doppler device was newly developed by modifying the Doppler ultrasound module of the cardiotocograph (CTG). A new signal processing algorithm was designed to produce real-time measurements. To improve the resolution, the backing module was attached to the probe. On-line signal processing produced a successful real-time and continuous calculation of displacement inside tissue. By means of an on-line 2/3 Hz high pass filter, the very low frequency noises and the artifacts derived from maternal respiration etc. were removed. The signal/noise ratio was obviously increased and the waves of fetal tissue movements due to FBM were easily recognized in real-time LCD outputs. Although there is a limitation in measuring accuracy as far as using modified CTG units, the results demonstrate that our system has commendable quality in FBM tracking.

UI	MeSH Term	Description	Entries
D011247	Pregnancy	The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH.	Gestation,Pregnancies
D012119	Respiration	The act of breathing with the LUNGS, consisting of INHALATION, or the taking into the lungs of the ambient air, and of EXHALATION, or the expelling of the modified air which contains more CARBON DIOXIDE than the air taken in (Blakiston's Gould Medical Dictionary, 4th ed.). This does not include tissue respiration (	Breathing
D003199	Computer Systems	Systems composed of a computer or computers, peripheral equipment, such as disks, printers, and terminals, and telecommunications capabilities.	Computer Architecture,Computer System,Computer Systems Development,Computer Systems Evaluation,Computer Systems Organization,Real Time System,Real-Time Systems,Organization, Computer Systems,Architecture, Computer,Architectures, Computer,Computer Architectures,Computer Systems Evaluations,Development, Computer Systems,Evaluation, Computer Systems,Evaluations, Computer Systems,Real Time Systems,Real-Time System,System, Computer,System, Real Time,System, Real-Time,Systems, Computer,Systems, Real Time,Systems, Real-Time,Time System, Real,Time Systems, Real
D005260	Female		Females
D005323	Fetal Monitoring	Physiologic or biochemical monitoring of the fetus. It is usually done during LABOR, OBSTETRIC and may be performed in conjunction with the monitoring of uterine activity. It may also be performed prenatally as when the mother is undergoing surgery.	Monitoring, Fetal,Fetal Monitorings,Monitorings, Fetal
D005324	Fetal Movement	Physical activity of the FETUS in utero. Gross or fine fetal body movement can be monitored by the mother, PALPATION, or ULTRASONOGRAPHY.	Fetal Activity,Fetal Activities,Fetal Movements
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D012815	Signal Processing, Computer-Assisted	Computer-assisted processing of electric, ultrasonic, or electronic signals to interpret function and activity.	Digital Signal Processing,Signal Interpretation, Computer-Assisted,Signal Processing, Digital,Computer-Assisted Signal Interpretation,Computer-Assisted Signal Interpretations,Computer-Assisted Signal Processing,Interpretation, Computer-Assisted Signal,Interpretations, Computer-Assisted Signal,Signal Interpretation, Computer Assisted,Signal Interpretations, Computer-Assisted,Signal Processing, Computer Assisted
D016216	Ultrasonography, Prenatal	The visualization of tissues during pregnancy through recording of the echoes of ultrasonic waves directed into the body. The procedure may be applied with reference to the mother or the fetus and with reference to organs or the detection of maternal or fetal disease.	Fetal Ultrasonography,Prenatal Diagnosis, Ultrasonic,Ultrasonography, Fetal,Diagnosis, Prenatal Ultrasonic,Diagnosis, Ultrasonic Prenatal,Prenatal Ultrasonic Diagnosis,Prenatal Ultrasonography,Ultrasonic Diagnosis, Prenatal,Ultrasonic Prenatal Diagnosis,Diagnoses, Prenatal Ultrasonic,Diagnoses, Ultrasonic Prenatal,Prenatal Diagnoses, Ultrasonic,Prenatal Ultrasonic Diagnoses,Ultrasonic Diagnoses, Prenatal,Ultrasonic Prenatal Diagnoses