TY - GEN
T1 - Blood Flow measurements using self-mixing laser diode
T2 - 1999 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim 1999
AU - Ozdemir, Sahin Kaya
AU - Takamiya, Sotetsu
AU - Ito, Satoshi
AU - Shinohara, Shigenobu
AU - Yoshida, Hirofumi
N1 - Publisher Copyright:
© 1999 IEEE.
PY - 1999
Y1 - 1999
N2 - Recently, we demonstrated that the speckle signal from a self-mixing laser diode (SM-LD) can be used for non-invasive measurements of relative blood flow in the human body. The measurement of blood flow is based on counting the number of the intensity changes in the speckle signal of an SM-LD in a predetermined time interval and calculating the mean speckle frequency. It was shown by performing measurements on healthy human volunteers that the mean speckle frequency is higher in the areas where blood flow is active (e.g. enhanced flow, along observable vessels, healthy scabs) but has smaller values on the areas where blood flow is not active or restricted (e.g. areas with non-observable vessels). The blood flow velocity obtained on those measurements is a relative value but it has consistent linear relation characteristics with the mean flow velocity. In this paper, we study the effect of background reflectance and hematocrit level of the blood on the mean speckle frequency by a simple model. On the basis of the results, we discuss the possibility of calibrating the measurements to get an idea on the absolute velocity measurements.
AB - Recently, we demonstrated that the speckle signal from a self-mixing laser diode (SM-LD) can be used for non-invasive measurements of relative blood flow in the human body. The measurement of blood flow is based on counting the number of the intensity changes in the speckle signal of an SM-LD in a predetermined time interval and calculating the mean speckle frequency. It was shown by performing measurements on healthy human volunteers that the mean speckle frequency is higher in the areas where blood flow is active (e.g. enhanced flow, along observable vessels, healthy scabs) but has smaller values on the areas where blood flow is not active or restricted (e.g. areas with non-observable vessels). The blood flow velocity obtained on those measurements is a relative value but it has consistent linear relation characteristics with the mean flow velocity. In this paper, we study the effect of background reflectance and hematocrit level of the blood on the mean speckle frequency by a simple model. On the basis of the results, we discuss the possibility of calibrating the measurements to get an idea on the absolute velocity measurements.
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U2 - 10.1109/CLEOPR.1999.817945
DO - 10.1109/CLEOPR.1999.817945
M3 - Conference contribution
AN - SCOPUS:0033325826
T3 - CLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics
SP - 1008
EP - 1009
BT - CLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics
PB - Institute of Electrical and Electronics Engineers Inc.
Y2 - 30 August 1999 through 3 September 1999
ER -
