Artery Research

Volume 24, Issue C, December 2018, Pages 129 - 130

P168 FEASIBILITY STUDY OF LOCAL PULSE WAVE VELOCITY ESTIMATION IN THE CAROTID ARTERY WITH MULTI-BEAM LASER DOPPLER VIBROMETER

Authors
Daniela Tommasin1, Yanlu Li2, 3, Jonathan Reeves4, 5, Roel Baets2, 3, Steve Greenwald4, Patrick Segers1
1IBiTech-bioMMeda, Ghent University, Ghent, Belgium
2Photonics Research Group, INTEC -department, Ghent University - IMEC, Ghent, Belgium
3Center for Nano- and Biophotonics, Ghent University, Ghent, Belgium
4Blizard Institute, Queen Mary University of London, London, UK
5Clinical Physics, Barts Health Trust, London, UK
Available Online 4 December 2018.
DOI
10.1016/j.artres.2018.10.221How to use a DOI?
Abstract

Background: An innovative device using Laser Doppler Vibrometry (LDV) has been designed [1] to measure the transit time of the pulse wave between two locations along the course of the carotid artery (CA) from skin surface vibrations for assessment of local pulse wave velocity (PWV) [2]. Aim: Tests were conducted on in-vitro models to assess the feasibility of the LDV to estimate the local PWV; preliminary in-vivo measurements were also performed.

Methods: Two CA geometries embedded within a soft-tissue-mimicking hydrogel were considered: i) a straight latex tube and ii) a patient-specific CA silicone-rubber model including the bifurcation. Models were pressurised in a water-filled loop and pulsatile flow was generated with a pump and/or high frequency impulses induced externally. For all measurements, two sets of six beams were used to measure surface displacement perpendicular to the external surface. PWV was calculated from the distance between selected beams and the delay between corresponding signals, using the time of the maximum of first and second derivatives of pressure (P-PWV) and displacement (LDV-PWV) as fiducial points [3]. A windowed cross correlation method [4] was also used for the in-vivo data analysis.

Results: PWV values for the in-vitro models are summarized in Table 1, while preliminary in-vivo LDV-PWV results are shown in Fig 1.

Table 1

P-PWV and LDV-PWV mean values under pulsatile flow and induced impulse conditions.

Conclusions: Good agreement between P-PWV and LDV-PWV in the tubular model was found under impulse loading, while complex waveforms measured under pulsatile flow and in-vivo conditions lead to more disparate effects when using different analysis methods. Further signal analysis is warranted.

Open Access
This is an open access article distributed under the CC BY-NC license.

References

1.Y Li, J Zhu, M Duperron, P O’Brien, R Schuler, S Aasmul, M De Melis, M Kersemans, and R Baets, Six-beam homodyne laser Doppler vibrometry based on silicon photonics technology, Optics Express, Vol. 26, No. 3, 2018, pp. 3638-3645.
2.T Pereira, C Correia, and J Cardoso, Novel Methods: for Pulse Wave Velocity Measurement, Journal of Medical and Biological Engineering, Vol. 35, No. 5, 2015, pp. 555-565.
3.E Hermeling, KD Reesink, LM Kornmann, RS Reneman, and AP Hoeks, The dicrotic notch as alternative time-reference point to measure local pulse wave velocity in the carotid artery by means of ultrasonography, J Hypertens, Vol. 27, No. 10, 2009, pp. 2028-35.
4.TG Papaioannou, O Vardoulis, A Protogerou, G Konstantonis, PP Sfikakis, C Stefanadis, and N Stergiopulos, In vivo evaluation of a novel ‘diastole-patching’ algorithm for the estimation of pulse transit time: advancing the precision in pulse wave velocity measurement, Physiol Meas, Vol. 36, No. 1, 2015, pp. 149-161.
Journal
Artery Research
Volume-Issue
24 - C
Pages
129 - 130
Publication Date
2018/12/04
ISSN (Online)
1876-4401
ISSN (Print)
1872-9312
DOI
10.1016/j.artres.2018.10.221How to use a DOI?
Open Access
This is an open access article distributed under the CC BY-NC license.

Cite this article

TY  - JOUR
AU  - Daniela Tommasin
AU  - Yanlu Li
AU  - Jonathan Reeves
AU  - Roel Baets
AU  - Steve Greenwald
AU  - Patrick Segers
PY  - 2018
DA  - 2018/12/04
TI  - P168 FEASIBILITY STUDY OF LOCAL PULSE WAVE VELOCITY ESTIMATION IN THE CAROTID ARTERY WITH MULTI-BEAM LASER DOPPLER VIBROMETER
JO  - Artery Research
SP  - 129
EP  - 130
VL  - 24
IS  - C
SN  - 1876-4401
UR  - https://doi.org/10.1016/j.artres.2018.10.221
DO  - 10.1016/j.artres.2018.10.221
ID  - Tommasin2018
ER  -