Document Detail


Tissue Doppler gated (TDOG) dynamic three-dimensional ultrasound imaging of the fetal heart.
MedLine Citation:
PMID:  15287059     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Dynamic three-dimensional (3D) ultrasound imaging of the fetal heart is difficult due to the absence of an electrocardiogram (ECG) signal for synchronization between loops. In this study we introduce tissue Doppler gating (TDOG), a technique in which tissue Doppler data are used to calculate a gating signal. We have applied this cardiac gating method to dynamic 3D reconstructions of the heart of eight fetuses aged 20-24 weeks. The gating signal was derived from the amplitude and frequency contents of the tissue Doppler signal. We used this signal as a replacement for ECG in a 3D-volume reconstruction and visualization, utilizing techniques established in ECG-gated 3D echocardiography. The reliability of the TDOG signal for fetal cardiac cycle detection was experimentally investigated. Simultaneous recordings of tissue Doppler of the heart and continuous wave (CW) spectral Doppler of the umbilical artery (UA) were performed using two independent ultrasound systems, and the TDOG signal from one system was compared to the Doppler spectrum data from the other system. Each recording consisted of a two-dimensional (2D) sector scan, transabdominally and slowly tilted by the operator, covering the fetal heart over approximately 40 cardiac cycles. The total angle of the sweep was estimated by recording a separate loop through the center of the heart, in the elevation direction of the sweep.3D reconstruction and visualization were performed with the EchoPAC-3D software (GE Medical Systems). The 3D data were visualized by showing simultaneous cineloops of three 2D slices, as well as by volume projections running in cineloop. Synchronization of B-mode cineloops with the TDOG signal proved to be sufficiently accurate for reconstruction of high-quality dynamic 3D data. We show one example of a B-mode recording with a frame rate of 96 frames/s over 20 seconds. The reconstruction consists of 31 volumes, each with 49 tilted frames. With the fetal heart positioned 5-8 cm from the transducer, the sampling distances were approximately 0.15 mm in the beam direction, 0.33 degrees approximately 0.37 mm azimuth and 0.45 degrees approximately 0.51 mm elevation. From this single dataset we were able to generate a complete set of classical 2D views (such as four-chamber, three-vessel and short-axis views as well as those of the ascending aorta, aortic and ductal arches and inferior and superior venae cavae) with high image quality adequate for clinical use.
Authors:
S Brekke; E Tegnander; H G Torp; S H Eik-Nes
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Publication Detail:
Type:  Evaluation Studies; Journal Article    
Journal Detail:
Title:  Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology     Volume:  24     ISSN:  0960-7692     ISO Abbreviation:  Ultrasound Obstet Gynecol     Publication Date:  2004 Aug 
Date Detail:
Created Date:  2004-08-02     Completed Date:  2004-09-21     Revised Date:  2009-11-03    
Medline Journal Info:
Nlm Unique ID:  9108340     Medline TA:  Ultrasound Obstet Gynecol     Country:  England    
Other Details:
Languages:  eng     Pagination:  192-8     Citation Subset:  IM    
Copyright Information:
Copyright 2004 ISUOG
Affiliation:
Department of Circulation and Diagnostic Imaging, Norwegian University of Science and Technology, Trondheim, Norway. svein.brekke@medisin.ntnu.no
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MeSH Terms
Descriptor/Qualifier:
Echocardiography, Three-Dimensional / methods*
Feasibility Studies
Female
Fetal Heart / ultrasonography*
Humans
Image Processing, Computer-Assisted / methods
Pregnancy
Ultrasonography, Doppler
Ultrasonography, Prenatal / methods*
Umbilical Arteries / ultrasonography

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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