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. 2016 Mar 15;5:328. doi: 10.1186/s40064-016-1977-z

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© Park et al. 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 4 — As Doppler beam-flow angles decreased, decreases in spectral broadening were seen. a Image of Doppler velocity measurement taken at a 64° beam-flow angle without the use of slanted gel pads shows spectral broadening throughout nearly the whole velocity range (arrow). b Image of Doppler velocity measurement taken at a 44° beam-flow angle with the use of a slanted gel pad (star) shows much decreased spectral broadening seen mostly throughout only the upper velocity range (arrow)