Power spectrum and blood flow velocity images obtained by dual-beam backscatter laser Doppler velocimetry

Ishida, Hideaki; Yasue, Youichi; Hachiga, Tadashi; Andoh, Tsugunobu; Akiguchi, Shunsuke; Kuraishi, Yasushi; Shimizu, Tadamichi

doi:10.1007/s10043-014-0071-4

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…In LDV, which detects the Doppler shift frequency in a single laser beam, blood flow parameters are estimated by integrating the spectrum of the optical signal [31,32]. The number of moving red cells (N) in the measurement volume is proportional to the integral of the Doppler power spectrum [P(f)], which can be obtained as follows:…”

Section: Results Of Pulsatile L-mldv In the Carotid Arterymentioning

confidence: 99%

High-resolution in-situ LDV monitoring system for measuring velocity distribution in blood vessel

Kyoden

Abe

Ishida

et al. 2015

Optics Communications

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Section: Results Of Pulsatile L-mldv In the Carotid Arterymentioning

confidence: 99%

High-resolution in-situ LDV monitoring system for measuring velocity distribution in blood vessel

Kyoden

Abe

Ishida

et al. 2015

Optics Communications

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In vivo visualization method by absolute blood flow velocity based on speckle and fringe pattern using two-beam multipoint laser Doppler velocimetry

Kyoden

Shoji

Akiguchi

et al. 2016

Journal of Applied Physics

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Two-beam multipoint laser Doppler velocimetry (two-beam MLDV) is a non-invasive imaging technique able to provide an image of two-dimensional blood flow and has potential for observing cancer as previously demonstrated in a mouse model. In two-beam MLDV, the blood flow velocity can be estimated from red blood cells passing through a fringe pattern generated in the skin. The fringe pattern is created at the intersection of two beams in conventional LDV and two-beam MLDV. Being able to choose the depth position is an advantage of two-beam MLDV, and the position of a blood vessel can be identified in a three-dimensional space using this technique. Initially, we observed the fringe pattern in the skin, and the undeveloped or developed speckle pattern generated in a deeper position of the skin. The validity of the absolute velocity value detected by two-beam MLDV was verified while changing the number of layers of skin around a transparent flow channel. The absolute velocity value independent of direction was detected using the developed speckle pattern, which is created by the skin construct and two beams in the flow channel. Finally, we showed the relationship between the signal intensity and the fringe pattern, undeveloped speckle, or developed speckle pattern based on the skin depth. The Doppler signals were not detected at deeper positions in the skin, which qualitatively indicates the depth limit for two-beam MLDV.

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Three-dimensional imaging of absolute blood flow velocity and blood vessel position under low blood flow velocity based on Doppler signal information included in scattered light from red blood cells

Kyoden

Akiguchi

Tajiri

et al. 2017

Journal of Applied Physics

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The development of a system for in vivo visualization of occluded distal blood vessels for diabetic patients is the main target of our research. We herein describe two-beam multipoint laser Doppler velocimetry (MLDV), which measures the instantaneous multipoint flow velocity and can be used to observe the blood flow velocity in peripheral blood vessels. By including a motorized stage to shift the measurement points horizontally and in the depth direction while measuring the velocity, the path of the blood vessel in the skin could be observed using blood flow velocity in three-dimensional space. The relationship of the signal power density between the blood vessel and the surrounding tissues was shown and helped us identify the position of the blood vessel. Two-beam MLDV can be used to simultaneously determine the absolute blood flow velocity distribution and identify the blood vessel position in skin.

show abstract

Power spectrum and blood flow velocity images obtained by dual-beam backscatter laser Doppler velocimetry

Cited by 3 publications

References 22 publications

High-resolution in-situ LDV monitoring system for measuring velocity distribution in blood vessel

High-resolution in-situ LDV monitoring system for measuring velocity distribution in blood vessel

In vivo visualization method by absolute blood flow velocity based on speckle and fringe pattern using two-beam multipoint laser Doppler velocimetry

Three-dimensional imaging of absolute blood flow velocity and blood vessel position under low blood flow velocity based on Doppler signal information included in scattered light from red blood cells

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