Methodology for enhanced optical signal acquisition in wearable cardiovascular monitoring: initial findings
Micha De Bont (University of Twente)
Tom Knop (University of Twente)
Ingemar Fredriksson (Linkoping University)
Wiendelt Steenbergen (University of Twente)
N. Bhattacharya (TU Delft - Optical Technologies)
A. Chizari (University of Twente, TU Delft - Optical Technologies)
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Abstract
Non-invasive optical methods, such as diffuse correlation spectroscopy and photoplethysmography, provide critical cardiovascular insights and are increasingly used in wearable devices. However, for optimal performance, there is a need for patient-specific design of optical transceivers. We present a methodology for optimizing optical transceiver design by linking source–detector distance (SDD) to depth sensitivity. Speckle variance OCT angiograms from healthy volunteers informed a skin digital twin model for Monte Carlo simulations of light transport. Results show short SDDs probe the upper dermis, while longer SDDs reach the hypodermis. For the studied population, an optimal SDD of 0.75 mm maximized scattering in upper dermis, aligning with the measured average microvascular depth. Our framework enables patient-specific device design across diverse populations, including hypertensive elderly.