Motion tracking system for robust non-contact blood perfusion sensor

Masaaki Hashimoto, Yoshihiro Taguchi

Research output: Contribution to journalArticle

Abstract

We propose a motion-robust laser Doppler flowmetry (LDF) system that can be used as a non-contact blood perfusion sensor for medical diagnosis. Endoscopic LDF systems are typically limited in their usefulness in clinical contexts by the need for the natural organs to be immobilized, as serious motion artifacts due to the axial surface displacement can interfere with blood perfusion measurements. In our system, the focusing lens moves to track the motion of the target using a low-frequency reference signal in the optical data, enabling the suppression of these motion artifacts in the axial direction. This paper reports feasibility tests on a prototype of this system using a microfluidic phantom as a measurement target moving in the direction of the optical axis. The frequency spectra detected and the perfusion values calculated from those spectra show that the motion tracking system is capable of suppressing motion artifacts in perfusion readings. We compared the prototype LDF system’s measurements with and without motion feedback, and found that motion tracking improves the fidelity of the perfusion signal by as much as 87%.

Original languageEnglish
Article number277
JournalSensors (Switzerland)
Volume18
Issue number1
DOIs
Publication statusPublished - 2018 Jan 18

Fingerprint

blood
Blood
Perfusion
Lasers
sensors
Sensors
Laser-Doppler Flowmetry
Artifacts
artifacts
Microfluidics
Lenses
Feedback
prototypes
lasers
organs
Reading
Direction compound
lenses
retarding
low frequencies

Keywords

  • Artifact
  • Blood perfusion
  • Laser doppler flowmetry
  • Motion tracking

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Biochemistry
  • Instrumentation
  • Electrical and Electronic Engineering

Cite this

Motion tracking system for robust non-contact blood perfusion sensor. / Hashimoto, Masaaki; Taguchi, Yoshihiro.

In: Sensors (Switzerland), Vol. 18, No. 1, 277, 18.01.2018.

Research output: Contribution to journalArticle

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