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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

Conversion of umbilical arterial Doppler waveforms to cardiac cycle triggering signals: a preparatory study for online motion-gated three-dimensional fetal echocardiography
Conversion of umbilical arterial Doppler waveforms to cardiac cycle triggering signals: a preparatory study for online motion-gated three-dimensional fetal echocardiography
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 (? 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)] ÷ the mean, was 90% to 96% for the not-noticeable interference high- and low-flow groups and for the moderate interference high-flow 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
fetal heart, ultrasonography, doppler and echocardiography, three-dimensional, four-dimensional, motion artefact, cardiac gating, ultrasound interference, scanner design, transit-time ultrasound flow meter, electrocardiography
0301-5629
51-59
Deng, Jing
b70f39d0-b448-4e6d-951c-6c149988cae1
Birkett, Alex G.
d69bdafc-fc8e-4baa-a27b-d4b5f94876f8
Kalache, Karim D.
fc3d1666-551d-4dce-845c-710c5908d726
Hanson, Mark A.
1952fad1-abc7-4284-a0bc-a7eb31f70a3f
Peebles, Donald M.
62d4334e-37bc-4744-8582-49df22625888
Linney, Alfred D.
5633b917-d316-44ae-be08-35661c1d14ca
Lees, William R.
7b456a11-15aa-4d5a-9464-212d7a95c070
Rodeck, Charles H.
25513fd2-b0e2-480d-bcb2-10b37d8269c8
Deng, Jing
b70f39d0-b448-4e6d-951c-6c149988cae1
Birkett, Alex G.
d69bdafc-fc8e-4baa-a27b-d4b5f94876f8
Kalache, Karim D.
fc3d1666-551d-4dce-845c-710c5908d726
Hanson, Mark A.
1952fad1-abc7-4284-a0bc-a7eb31f70a3f
Peebles, Donald M.
62d4334e-37bc-4744-8582-49df22625888
Linney, Alfred D.
5633b917-d316-44ae-be08-35661c1d14ca
Lees, William R.
7b456a11-15aa-4d5a-9464-212d7a95c070
Rodeck, Charles H.
25513fd2-b0e2-480d-bcb2-10b37d8269c8

Deng, Jing, Birkett, Alex G., Kalache, Karim D., Hanson, Mark A., Peebles, Donald M., Linney, Alfred D., Lees, William R. and Rodeck, Charles H. (2001) Conversion of umbilical arterial Doppler waveforms to cardiac cycle triggering signals: a preparatory study for online motion-gated three-dimensional fetal echocardiography. Ultrasound in Medicine & Biology, 27 (1), 51-59. (doi:10.1016/S0301-5629(00)00315-X).

Record type: Article

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 (? 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)] ÷ the mean, was 90% to 96% for the not-noticeable interference high- and low-flow groups and for the moderate interference high-flow 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

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More information

Published date: 2001
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

Identifiers

Local EPrints ID: 25403
URI: https://eprints.soton.ac.uk/id/eprint/25403
ISSN: 0301-5629
PURE UUID: f34cd0ce-9845-4256-aadf-9e27887263c7
ORCID for Mark A. Hanson: ORCID iD orcid.org/0000-0002-6907-613X

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Date deposited: 07 Apr 2006
Last modified: 07 Aug 2019 00:46

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