Phase delays in reflectance pulse oximetry: a Monte Carlo study

Reindert Graaff; A. C. M. Dassel; W. G. Zijlstra; Frits F. M. de Mul; Jan G. Aarnoudse

doi:10.1117/12.230004

15 January 1996 Phase delays in reflectance pulse oximetry: a Monte Carlo study

Reindert Graaff, A. C. M. Dassel, W. G. Zijlstra, Frits F. M. de Mul, Jan G. Aarnoudse

Proceedings Volume 2628, Optical and Imaging Techniques for Biomonitoring; (1996) https://doi.org/10.1117/12.230004
Event: BiOS Europe '95, 1995, Barcelona, Spain

Abstract

In pulse oximetry, the red and infrared intensity fluctuations are often assumed to have the same form. However, we observed strong phase delays between these signals during measurements on the forehead of some of our subjects when no pressure was applied onto the probe, which practically disappeared when pressure was applied on the probe. The signals obtained at different distances from the light source were transformed into fluctuations in the absorption and reduced scattering coefficient by means of results from Monte Carlo simulations. The changes in the reduced scattering coefficient appeared to be inverted when no pressure was applied onto the probe. Although the calculated relation between the red and infrared fluctuations in the absorption coefficient was sometimes free of hysteresis, the ratio between the fluctuations still depend on pressure on the probe, and on the chosen optical properties of the medium.

Citation Download Citation

Reindert Graaff, A. C. M. Dassel, W. G. Zijlstra, Frits F. M. de Mul, and Jan G. Aarnoudse "Phase delays in reflectance pulse oximetry: a Monte Carlo study", Proc. SPIE 2628, Optical and Imaging Techniques for Biomonitoring, (15 January 1996); https://doi.org/10.1117/12.230004

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available