Premium
Time‐domain ultrasonography during pregnancy.
Author(s) -
Lee W,
Bendick P,
Best A M,
Kozlowski N,
Kirk J S,
Comstock C H
Publication year - 1994
Publication title -
journal of ultrasound in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 91
eISSN - 1550-9613
pISSN - 0278-4297
DOI - 10.7863/jum.1994.13.6.457
Subject(s) - doppler effect , medicine , pulsatile flow , ultrasonography , time domain , blood flow , volume (thermodynamics) , flow (mathematics) , biomedical engineering , radiology , physics , computer science , mechanics , computer vision , quantum mechanics , astronomy
Time‐domain ultrasonography is an alternative to Doppler analysis of blood flow direction and velocity. The technique uses timing information between successive echo pulses to measure flow velocities directly through a color display map. Volume flow quantification also can be achieved by combining time‐domain methods with M‐mode ultrasonography. This report describes our preliminary experiences with fetal vascular imaging by time‐domain ultrasonography, compares Doppler peak velocity correlation to time‐domain sonography, and examines the in vitro accuracy of time‐domain sonography combined with M‐mode volume flow measurements. Excellent agreement was found between peak Doppler velocity measurements and time‐domain ultrasonography for a variety of maternal and fetal vessels (N = 29). Close volume‐flow correlation was observed between a flow pump and time‐domain ultrasonography under constant and pulsatile conditions. Time‐domain ultrasonography appears to be a useful alternative to Doppler techniques for imaging small fetal vessels and also may provide the basis for accurate volume flow measurements during pregnancy.