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Related Experiment Video

Updated: Dec 20, 2025

How to Build a Laser Speckle Contrast Imaging LSCI System to Monitor Blood Flow
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Laser speckle contrast imaging system using nanosecond pulse laser source.

Yuemei Zhao1, Kang Wang1, Weitao Li1

  • 1Nanjing University of Aeronautics and Astronautics, Department of Biomedical Engineering, Nanjing, China.

Journal of Biomedical Optics
|May 27, 2020
PubMed
Summary

Nanosecond pulsed lasers can be used for laser speckle contrast imaging (LSCI) to measure blood flow. This method offers higher resolution for regional cerebral blood flow (rCBF) imaging compared to continuous wave lasers.

Keywords:
cerebral blood flowcontinuous wavelaser speckle contrast imaging

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Area of Science:

  • Biomedical Optics
  • Medical Imaging
  • Laser Physics

Background:

  • Laser speckle contrast imaging (LSCI) is a technique used to measure blood flow.
  • Previous studies have explored continuous wave (cw) lasers for LSCI.
  • Nanosecond-pulsed lasers offer potential advantages for dynamic imaging applications.

Purpose of the Study:

  • To evaluate the performance of nanosecond-pulsed lasers in LSCI for regional cerebral blood flow (rCBF) imaging.
  • To compare the image quality of rCBF obtained using nanosecond-pulsed lasers versus cw lasers.
  • To investigate the impact of pulse parameters on LSCI performance.

Main Methods:

  • Developed an LSCI system incorporating both cw and nanosecond-pulsed lasers at 532 nm and 632.8 nm wavelengths.
  • Acquired in vivo rCBF images of mice using both laser types.
  • Analyzed image resolution and characteristics.

Main Results:

  • Continuous wave lasers exhibited varying imaging characteristics for rCBF.
  • Nanosecond-pulsed 532 nm laser yielded higher resolution rCBF images compared to the 532 nm cw laser.
  • Pulse width and repetition rate did not significantly affect nanosecond pulse laser LSCI results.

Conclusions:

  • Nanosecond-pulsed lasers are suitable for LSCI applications.
  • This technology holds promise for fast, high-resolution blood flow imaging.
  • Further integration into photoacoustic imaging systems is feasible.