Optical Characteristics of Flowing Blood: Effects on the Pulse Oximeter

Author

Sakamoto, K. ; Furuya, N. ; Kanai, H.

Author_Institution

Ciba Inst. of Sci., Chiba

fYear

2007

fDate

22-26 Aug. 2007

Firstpage

4552

Lastpage

4555

Abstract

The causes of streaming transparency phenomena are discussed theoretically and experimentally in order to investigate the causes of the measurement error in pulse oximetry. We solve Maxwell equation under the assumption that erythrocytes are oblate spheroids to theoretically investigate the scattering phenomena due to erythrocytes. The theoretical results show that the forward scattering light strength for the flowing blood is much stronger than that for the resting blood. The streaming transparency phenomenon is caused by the light scattering change due to the orientation of erythrocytes. The scattering light intensity also strongly depends upon the wave-length of incident light.

Keywords

Maxwell equations; bio-optics; cellular biophysics; haemodynamics; molecular biophysics; oximetry; Maxwell equation; erythrocytes; flowing blood; forward scattering light strength; light scattering change; oblate spheroids; optical scattering phenomena; pulse oximetry; resting blood; scattering light intensity; streaming transparency phenomena; Blood; Electromagnetic scattering; Electromagnetic transients; Electromagnetic wave absorption; Light scattering; Maxwell equations; Measurement errors; Optical pulses; Optical scattering; Pulse measurements; Erythrocytes; Humans; Light; Models, Biological; Oximetry; Scattering, Radiation; Sensitivity and Specificity;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 2007. EMBS 2007. 29th Annual International Conference of the IEEE

Conference_Location

Lyon

ISSN

1557-170X

Print_ISBN

978-1-4244-0787-3

Type

conf

DOI

10.1109/IEMBS.2007.4353352

Filename

4353352