Effect of Skin Optical Absorption on Speckleplethysmographic (SPG) Signals

Overview

Journal Biomed Opt Express

Specialty Radiology

Date 2020 Oct 5

PMID 33014619

Citations 5

Authors

Tyler B Rice

Bruce Yang

Sean White

Affiliations

Soon will be listed here.

Abstract

Recent advances in optical technology have emerged for measuring blood flow in the extremities using speckleplethysmography (SPG), which may address needs in vascular medicine and other fields. SPG has demonstrated a highly linear response with flow rate, but the susceptibility to differences in skin tone is unclear. Two validation studies using skin-simulating phantoms and a simple clinical protocol were conducted to determine the impact of absorbing skin layers on SPG measurements. Benchtop results demonstrated that the coefficient of determination between known flow rate and SPG was highly linear (R = 0.990) and was unaffected by the addition of skin-phantom layers with variable absorption (R = 0.996-0.999). Additionally, no significant trend was found between the fit residuals of SPG and flow rate with increasing skin-phantom absorption (R=0.025, p = 0.29). In clinical testing, no significant difference was found using both a 4-way ANOVA between demographic classifications (F = 0.89, p = 0.45), and a 2-way ANOVA test between lower- and higher-melanin subclassifications (F = 0.4, p = 0.52).

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