By Vikramajeet Khatri, Carrie B. Peterson (auth.), Kim Dremstrup, Steve Rees, Morten Ølgaard Jensen (eds.)
This quantity offers the court cases of the fifteenth Nordic-Baltic convention on Biomedical Engineering and scientific Physics. NBC 2011 introduced jointly technology, schooling and enterprise below the motto “Cooperation for health”.
the subjects lined by means of the convention lawsuits contain: Imaging, Biomechanics, Neural engineering, recreation technology, Cardio-pulmonary engineering, clinical Informatics, Ultrasound, Assistive expertise, Telemedicine, and common Biomedical Engineering.
Read Online or Download 15th Nordic-Baltic Conference on Biomedical Engineering and Medical Physics (NBC 2011): 14-17 June 2011, Aalborg, Denmark PDF
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Additional info for 15th Nordic-Baltic Conference on Biomedical Engineering and Medical Physics (NBC 2011): 14-17 June 2011, Aalborg, Denmark
Two different distances for the PPG recordings. The shallow blood flow is measured by light from green LEDs (placed 4 mm from the detectors) and the deeper tissue layers are reached by infrared LEDs (placed 25 mm from the detectors). All electrical and optical components are embedded in the flexible silicon sheet (10 cm x 10 cm and 5 mm thickness) with an extended tail to protect the connection cables. A sketch of the probe is presented in Figure 1. The two sets of LEDs are alternately switched, and the total light reaching the photo detectors is collected into two PPG-channels, PPGG (O nm) and PPGIR (O nm).
The influence of the laser light to the PPG-channels is less in the outer position of the LDF-fibre. Interference can be totally avoided by switching, only measuring by one technique at a time. Rapid flow changes are then not possible to monitor fully. When rapid blood flow variations at different vascular depths are of interest to monitor, placement of the LDF-fibre in the outer position and use of a higher light intensity of the PPG-LEDs might be an alternative. However, interference still can be present, and further, the measurement volume of LDF will be different from that covered by PPG-channels.
It is noticeable that in younger subjects the reflected wave maximum falls between two inflection points where the second derivative is negative. Similarly the inflection points are visible in the signals of older subjects. For the older subjects the reflected wave can be detected at the place where the second derivative has a minimal value between two inflection points. For the augmentation index calculation the algorithm firstly finds within one heart cycle the pressure wave maximal and minimal points.