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Assessment of the optical interference in a PPG-LDF system used for estimation of tissue blood flow
Mälardalen University, School of Innovation, Design and Engineering. (ISS)
Mälardalen University, School of Innovation, Design and Engineering. (ISS)ORCID iD: 0000-0001-8704-402X
Linköpings Universitet, IMT.
Mälardalen University, School of Innovation, Design and Engineering. (ISS)ORCID iD: 0000-0003-1940-1747
2011 (English)In: IFMBE PROCEEDINGS: 15th Nordic-Baltic Conference on Biomedical Engineering and Medical Physics, NBC 2011; Aalborg; 14 June 2011 through 17 June 2011 / [ed] Kim Dremstrup, 2011Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
2011.
National Category
Medical Laboratory and Measurements Technologies
Research subject
Electronics
Identifiers
URN: urn:nbn:se:mdh:diva-12223DOI: 10.1007/978-3-642-21683-1_4Scopus ID: 2-s2.0-79959985250ISBN: 978-364221682-4 (print)OAI: oai:DiVA.org:mdh-12223DiVA: diva2:415677
Available from: 2011-05-09 Created: 2011-05-09 Last updated: 2013-12-03Bibliographically approved
In thesis
1. Non-invasive techniques for assessment of peripheral blood flow at different vascular depths
Open this publication in new window or tab >>Non-invasive techniques for assessment of peripheral blood flow at different vascular depths
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Missing or reduced blood flow can lead to pressure ulcers. Monitoring blood flow in areas prone to pressure ulcer development would be a valuable tool for prevention of pressure ulcers.

PPG and LDF are both established non invasive optical techniques that can be used to estimate the changes in blood flow in different tissue volumes. The aim of this thesis was to combine the established techniques, LDF and PPG, into one flexible silicon probe intended for evaluation of peripheral blood flow in tissue volumes prone to pressure ulcer development. Further, a temperature sensor was integrated.

Two probe configurations combining LDF and PPG has been evaluated regarding the ability to separate between shallow, medium and deep blood flow variations, and skin temperature changes. Further, techniques to reduce or totally avoid interference between LDF and PPG have been investigated.

The probes can be used to discriminate between blood flows at different vascular depths. The vascular depths reached by the different channels correspond to the depths of interest when investigating pressure ulcer aetiology. The probe itself has shown not to affect the skin surface temperature, neither due to the silicon sheet or the light. The skin temperature can be expected to rise and approach the body core temperature by lying in supine position alone, which has to be taken into consideration when designing studies.

By switching between the different light sources, interference can be totally avoided. When rapid blood flow variations at several vascular depths are of interest to evaluate, a peripheral placement of the LDF-fibre and an increased illumination power of the PPG-LEDs might be used to minimize the interference between LDF and PPG.

Both probes have shown potential to be used for investigation of the processes in pressure ulcer development.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2011
Series
Mälardalen University Press Licentiate Theses, ISSN 1651-9256 ; 131
Research subject
Electronics
Identifiers
urn:nbn:se:mdh:diva-12226 (URN)978-91-7485-014-7 (ISBN)
Presentation
2011-05-19, Pi, Högskoleplan 1, Västerås, 14:00 (Swedish)
Opponent
Supervisors
Available from: 2011-05-09 Created: 2011-05-09 Last updated: 2011-05-12Bibliographically approved

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CiteExportLink to record
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