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Three-dimensional Optical-resolution Photoacoustic Microscopy
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Single-Cell Photoacoustic Microrheology.
IEEE Transactions on Medical Imaging
|December 12, 2019
Summary
Photoacoustic microrheology (PAMR) measures cell and tissue biomechanics. This new method accurately maps elasticity and viscosity, distinguishing cell types and showing clinical potential.
Area of Science:
- Biophysics
- Biotechnology
- Medical Imaging
Background:
- Cellular and tissue rheological properties (elasticity, viscosity) are crucial biomechanical parameters.
- These properties correlate with cellular function and disease states.
- Conventional methods for measuring microrheology are limited.
Purpose of the Study:
- To introduce an innovative photoacoustic microrheology (PAMR) technique.
- To extract elastic modulus and viscosity using time and phase characteristics of photoacoustic response.
- To validate PAMR's accuracy and feasibility for microrheological measurements.
Main Methods:
- Developed PAMR utilizing time and phase characteristics of photoacoustic signals.
- Validated the method with tissue-mimicking agar-gelatin phantoms of varying viscoelasticity.
- Performed single-cell elasticity and viscosity mapping on adipocytes and myocytes at micrometer scale.
Main Results:
- PAMR accurately measured elastic modulus and viscosity in phantoms.
- Achieved micrometer-scale mapping of elasticity and viscosity in single adipocytes and myocytes.
- Successfully distinguished normal blood cells from iron deficiency anemia cells based on rheological differences.
Conclusions:
- PAMR is a feasible and accurate method for microrheological measurements.
- The technique enables detailed mapping of cellular mechanical properties.
- PAMR offers significant clinical potential for interrogating mechanocellular properties and diagnosing diseases.
