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Conversion of umbilical arterial Doppler waveforms to cardiac cycle triggering signals: A preparatory study for online motion-gated three-dimensional fetal echocardiography

Deng, J; Birkett, AG; Kalache, KD; Hanson, MA; Peebles, DM; Linney, AD; Lees, WR; (2001) Conversion of umbilical arterial Doppler waveforms to cardiac cycle triggering signals: A preparatory study for online motion-gated three-dimensional fetal echocardiography. ULTRASOUND MED BIOL , 27 (1) 51 - 59.

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Abstract

To remove motion artefacts, a device was built to convert "noisy" umbilical arterial Doppler waveforms (UADWs) from an ultrasound (US) system into sharp ECG R-wave-like cardiac cycle triggering signals (CCTSs). These CCTSs were then used to gate a simultaneous (online) 3-D acquisition of sectional fetal echocardiograms from another US system. To test the conversion performance, a study was carried out in sheep fetal twins. Pulmonary arterial flow waveforms (PAFWs) from implanted probes were traced, in the meantime, to determine the reference cardiac cycle. Interference caused by running the two nonsynchronised US systems was controlled to three degrees (not-noticeable, moderate, and severe), together with high (greater than or equal to 40 cm/s) and low (< 40) flow velocities on UADWs. The conversion efficiency, assessed by the percentage of UADWs converted into CCTSs, was in the range of 83% to 100% for not-noticeable and moderate interference, and 0% to 71% for severe interference. The triggering accuracy, assessed by [(time lag mean between the onsets of PAFWs and corresponding CCTSs) - (its 99% confidence level)] <divided by> the mean, was 90% to 96% for the not-noticeable interference high- and low-flow groups and for the moderate interference high-how group; 19% to 93% for the moderate interference low-flow group; and from not obtainable up to 90% for the severe interference groups. The results show that UADWs can be used as a satisfactory online motion-gating source even in the presence of moderate interference. The major problems are from severe interference or moderate interference with low-flow velocity, which can be minimised/eliminated by the integration of the individual systems involved. (E-mail: jdeng@medphys.ucl.ac.uk) (C) 2001 World Federation for Ultrasound in Medicine & Biology.

Type: Article
Title: Conversion of umbilical arterial Doppler waveforms to cardiac cycle triggering signals: A preparatory study for online motion-gated three-dimensional fetal echocardiography
Keywords: fetal heart, ultrasonography, Doppler and echocardiography, three-dimensional, four-dimensional, motion artefact, cardiac gating, ultrasound interference, scanner design, transit-time ultrasound flow meter, electrocardiography, ULTRASOUND, ANATOMY
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > The Ear Institute
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Pop Health Sciences > Inst for Women's Health
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Pop Health Sciences > Inst for Women's Health > Maternal and Fetal Medicine
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
URI: http://discovery.ucl.ac.uk/id/eprint/119795
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