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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

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Full-field passive elastography using digital holography.

Agathe Marmin, Stefan Catheline, Amir Nahas

|June 2, 2020

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This summary is machine-generated.

Off-axis digital holography measures tissue displacements from diffuse shear waves. This non-contact method quantifies mechanical properties for passive elastography, validated in tissue-like and ex vivo samples.

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Digital Inline Holographic Microscopy DIHM of Weakly-scattering Subjects

Digital Inline Holographic Microscopy DIHM of Weakly-scattering Subjects

Published on: February 8, 2014

Area of Science:

Biomedical Optics
Materials Science
Medical Imaging

Background:

Off-axis digital holography offers direct phase and amplitude measurement from a single image.
Characterizing mechanical properties of biological tissues is crucial for diagnostics.
Existing elastography methods often require contact or synchronized wave sources.

Purpose of the Study:

To develop and validate a full-field quantitative passive elastography technique.
To measure mechanical properties using diffuse shear wave fields captured by digital holography.
To enable non-contact, source-independent mechanical property assessment of biological samples.

Main Methods:

Utilizing off-axis digital holography to capture displacements induced by diffuse shear waves.
Employing a noise-correlation-based algorithm for quantitative mechanical property measurement.
Validating the method on agarose phantoms and an ex vivo biological sample.

Main Results:

High-sensitivity displacement measurements from diffuse shear wave fields were achieved.
The passive elastography method successfully quantified mechanical properties.
Initial results demonstrated feasibility on both phantom and ex vivo biological samples.

Conclusions:

Off-axis digital holography enables sensitive, full-field passive elastography.
The developed method provides quantitative mechanical property mapping without contact or external wave sources.
This technique shows promise for non-invasive assessment of biological tissue mechanics.