Chemometric approach for improving VCSEL-based glucose predictions.
Optical methods are one of the painless and promising techniques that can be used for blood glucose predictions for diabetes patients. The use of thermally tunable vertical cavity surface-emitting lasers (VCSELs) as the light source to obtain blood absorption spectra, along with the multivariate technique partial least squares for analysis and glucose estimation, has been demonstrated. With further improvements by using data preprocessing and two VCSELs, we have achieved a clinically acceptable level in the physiological range in buffered solutions. The results of previous experiments conducted using white light showed that increasing the number of wavelength intervals used in the analysis improves the accuracy of prediction. The average prediction error, using absorption spectra from one VCSEL in aqueous solution, is about 1.2 mM. This error is reduced to 0.8 mM using absorption spectra from two VCSELs. This result confirms that increasing the number of VCSELs improves the accuracy of prediction.
Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, BC, Canada. sahbat@ece.ubc.ca
Sahba Talebi
ST
Fard
Lukas
L
Chrostowski
Ezra
E
Kwok
Markus-Christian
MC
Amann
D001786:Blood Glucose / Q000032:analysis*; D006801:Humans; D007834:Lasers; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008954:Models, Biological; D008991:Monitoring, Physiologic / Q000379:methods*; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D012815:Signal Processing, Computer-Assisted
D001786:Blood Glucose