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Optimal types of probe, and tissue Doppler frame rates, for use during tissue Doppler recording and off-line analysis of strain and strain rate in neonates at term*

Published online by Cambridge University Press:  28 August 2008

Eirik Nestaas ,
Asbjørn Støylen  and
Drude Fugelseth
Eirik Nestaas*
Affiliation:
Department of Paediatrics, Ullevål University Hospital, Oslo, Norway Department of Paediatrics, Hospital of Vestfold, Tønsberg, Norway
Asbjørn Støylen
Affiliation:
Department of Cardiology, St. Olavs Hospital, Trondheim, Norway Department of Circulation and Medical Imaging, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway
Drude Fugelseth
Affiliation:
Department of Paediatrics, Ullevål University Hospital, Oslo, Norway Faculty of Medicine, University of Oslo, Oslo, Norway
*
Correspondence to: Eirik Nestaas, Department of Paediatrics, Hospital of Vestfold, 3103 Tønsberg, Norway. Tel: +47 333 42 000; Fax: +47 333 43 975; E-mail: eirikpda@start.no
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Abstract

Measurements of strain and strain rate, obtained by tissue Doppler might provide new parameters for assessing cardiac function in neonates. The noise-to-signal ratio is high. We investigated the effect of the frequency of the probe used, and the settings for tissue Doppler frame rate, on the noise in the analyses in three series of tissue Doppler images. In the first series, we used the 5S probe, with a frequency of 2.4 MHz, and the default frame rate. We used the10S probe, with a frequency of 8.0 MHz, in the other two series, one with a low and one with the default frame rate. The noise was lower using the 5S rather than the 10S probe, and lower when using the low frame rate rather than the default rate with the 10S probe. Using the settings eligible for two segment analyses with the lowest noise for each series, the noise was from 36 to 42% higher when using the 10S probe at default frame rate, and from 13 to 14% higher when using the 10S probe at low frame rate compared to the 5S probe at default frame rate. There were no differences in peak systolic strain or strain rate between the series. We found, therefore, that use of the 5S probe with the default setting for frame rate, along with a length of 1 mm and width of 2 mm for the region of interest, and a strain length of 10 mm, provided the optimal settings for two-segment analyses in this study.

Keywords

Tissue doppler imagingbeat to beat variationspatial averagingregion of interest sizestrain lengthTissue Doppler frame rate
Type
Original Article
Information
Cardiology in the Young , Volume 18 , Issue 5 , October 2008 , pp. 502 - 511
Copyright
Copyright © Cambridge University Press 2008

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Footnotes

*

Statement of financial support: This study was supported by the Eastern Norway Regional Health Authority and by the Southern Norway Regional Health Authority.

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