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Phase Contrast and Differential Interference Contrast DIC Microscopy
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Topography and refractometry of sperm cells using spatial light interference microscopy.

Lina Liu1,2, Mikhail E Kandel1, Marcello Rubessa3

  • 1University of Illinois at Urbana-Champaign, Beckman Institute of Advanced Science and Technology, De, United States.

Journal of Biomedical Optics
|March 1, 2018
PubMed
Summary
This summary is machine-generated.

Spatial Light Interference Microscopy (SLIM) offers a label-free method to assess spermatozoon viability. This technique accurately measures cell thickness and refractive index, aiding infertility treatments.

Keywords:
refractive indexrefractometryspatial light interference microscopysperm celltopography

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Area of Science:

  • Biophysics
  • Cell Biology
  • Reproductive Medicine

Background:

  • Spermatozoon viability assessment is crucial for infertility treatment.
  • Label-free, phase-sensitive imaging presents a promising alternative to traditional assays.

Purpose of the Study:

  • To characterize spermatozoon viability using Spatial Light Interference Microscopy (SLIM).
  • To decouple average thickness and refractive index information from single sperm cells.

Main Methods:

  • Employed SLIM for high-accuracy, single-cell phase imaging.
  • Performed quantitative-phase imaging in media with two different refractive indices.
  • Utilized a numerical tool to correct for cell tail curvature.
  • Achieved ensemble averaging of topography and refractometry for 100 cells.

Main Results:

  • Demonstrated the ability to decouple thickness and refractive index.
  • Revealed sperm tail thickness down to 150 nm.
  • Measured refractive index values reaching 1.6 near the sperm head.

Conclusions:

  • SLIM provides a label-free, quantitative method for sperm analysis.
  • The technique enables detailed characterization of sperm cell topography and refractive properties.
  • This approach has significant potential for improving infertility diagnostics.