Clinical evaluation of non-invasive blood glucose measurement by using near infrared spectroscopy via inter- and intra-subject analysis

Pao Yue-kong Library Electronic Theses Database

Clinical evaluation of non-invasive blood glucose measurement by using near infrared spectroscopy via inter- and intra-subject analysis

 

Author: Lam, Chak-hing
Title: Clinical evaluation of non-invasive blood glucose measurement by using near infrared spectroscopy via inter- and intra-subject analysis
Degree: Ph.D.
Year: 2009
Subject: Hong Kong Polytechnic University -- Dissertations.
Blood -- Analysis.
Infrared spectroscopy.
Department: School of Nursing
Pages: xvii, 214, 15, xv leaves : ill. (some col.) ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2321038
URI: http://theses.lib.polyu.edu.hk/handle/200/4677
Abstract: Introduction Non-invasive blood glucose measurement through near infrared (NIR) is possible but its reliability is questioned. The aim of the thesis is to evaluate the reliability of non-invasive blood glucose measurement by using NIR spectroscopy. Methods The experiments on glucose solutions provided positive results, which were followed by three clinical trials on healthy people and diabetic patients. The NIR transmittance method was applied on the first two clinical trials, while the NIR reflectance method was used on the last clinical trial, which was specifically designed for intra- and inter-subject comparisons. Partial least square (PLS) regression and preprocesses of piecewise, direct standardization (PDS) and Savitsky-Golay smoothing and differentiation (Savgol) were used for the glucose prediction and comparison. Results and Discussions A higher predictability of NIR glucose measurement was found from the spectra of the intra-subject when compared with the inter-subject. The R correlation coefficient of prediction (Rp) of inter-subject ranged from 0.73 to 0.80, while Rp of intra-subject were 0.90 to 0.94. The root mean square error of prediction (rmsep) ranged from 2.49 to 3.52mmol/l (inter-subject) and 1.49 to 2.10mmol/l (intra-subject). The Rp of intra-subject were 15 to 25% higher than that of inter-subject. The rmsep of intra-subject was 43 to 74% lower than that of inter-subject. In addition, the results also supported the proportion that a larger calibration sample size to prediction sample size ratio provided a better prediction, in which Rp and rmsep could reach 0.92 and 1.71mmol/l, respectively, for 4:1 ratio (calibration sample size-to-prediction sample size). The Savgol preprocess was clinically proven to be suitable for the NIR spectroscopic reflectance measurement of human fingers. The NIR method provides an instantaneous measure to the glucose in blood. However, the method may be affected by physiological influences over long-term measurements. Conclusions Non-invasive NIR blood glucose measurement was achievable for an instantaneous measure. The major effect for NIR spectroscopic measurement was the physiological difference. Therefore, the development should focus on intra-subject data acquisition which showed relatively low physiological influence. Sufficient sampling data for calibrations and prediction were also vital, with boosting by a suitable preprocess.

Files in this item

Files Size Format
b23210382.pdf 2.707Mb PDF
Copyright Undertaking
As a bona fide Library user, I declare that:
  1. I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
  2. I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
  3. I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.

     

Quick Search

Browse

More Information