We have developed a system of flexible optical imaging bands that can be used to assess the effects of systemic lupus erythematosus (SLE) on finger joints. Each imaging band consists of four pairs of light sources and a photodetector. The light sources contain three different light emitting diodes with wavelengths of 530 nm, 655 nm and 940 nm. Two of these imaging bands are wrapped around the proximal interphalangeal (PIP) joints of the index-, middle-, and ringfingers. The imaging bands gather transmitted and reflected light intensities from the tissues for ~ 4 minutes including two venous occlusions. This results in hemodynamic time traces for all source-detector pairs. From theses traces a rise, plateau, and fall time are calculated. We found that, on average, signals obtained from SLE patients displayed a shorter rise time and longer plateau time as compared to signals from healthy controls. Performing a two-dimensional linear discriminant analysis on the rise and plateau times, we obtained the best specificity of 89% and the best sensitivity of 76 %. Area under the receiver operating characteristic (ROC) curve is 0.86.

Date Published: 20 February 2019
PDF: 4 pages
Proc. SPIE 10885, Optical Diagnostics and Sensing XIX: Toward Point-of-Care Diagnostics, 108850Z (20 February 2019); doi: 10.1117/12.2510305

Published in SPIE Proceedings Vol. 10885:
Optical Diagnostics and Sensing XIX: Toward Point-of-Care Diagnostics
Gerard L. Coté, Editor(s)