TY - JOUR
T1 - Relationship between wavelength combination and signal-to-noise ratio in measuring hemoglobin concentrations using visible or near-infrared light
AU - Funane, Tsukasa
AU - Atsumori, Hirokazu
AU - Sato, Hiroki
AU - Kiguchi, Masashi
AU - Maki, Atsushi
PY - 2009/10/19
Y1 - 2009/10/19
N2 - The signal-to-noise ratio (SNR), when using visible or near-infrared light to measure the change in hemoglobin concentration length (the product of hemoglobin concentration and optical path length in this study), depends on the wavelength combination and the analysis method. Although the SNRs increase when detected or incident optical power increases, the optical power should be limited because of safety standards. Considering these safety standards, we assumed that the total optical power was constant by using the relationship between optical power and measurement error. We investigated the theoretical estimation errors of the changes in hemoglobin concentration length using two, three, and four different wavelengths. The SNRs of the changes in hemoglobin concentration length were high when fewer wavelengths were used. These SNRs decreased when the redox state change in cytochrome oxidase was included in the analysis.
AB - The signal-to-noise ratio (SNR), when using visible or near-infrared light to measure the change in hemoglobin concentration length (the product of hemoglobin concentration and optical path length in this study), depends on the wavelength combination and the analysis method. Although the SNRs increase when detected or incident optical power increases, the optical power should be limited because of safety standards. Considering these safety standards, we assumed that the total optical power was constant by using the relationship between optical power and measurement error. We investigated the theoretical estimation errors of the changes in hemoglobin concentration length using two, three, and four different wavelengths. The SNRs of the changes in hemoglobin concentration length were high when fewer wavelengths were used. These SNRs decreased when the redox state change in cytochrome oxidase was included in the analysis.
KW - Cytochrome oxidase
KW - Hemoglobin concentration
KW - Laser safety standards
KW - Near-infrared light
KW - Optical topography
KW - Signal-to-noise ratio
KW - Wavelength combination
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U2 - 10.1007/s10043-009-0084-6
DO - 10.1007/s10043-009-0084-6
M3 - Review article
AN - SCOPUS:70349975870
VL - 16
SP - 442
EP - 448
JO - Optical Review
JF - Optical Review
SN - 1340-6000
IS - 4
ER -