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Three-dimensional Optical-resolution Photoacoustic Microscopy

Three-dimensional Optical-resolution Photoacoustic Microscopy

Published on: May 3, 2011

Ionic-resolution protoacoustic microscopy: A feasibility study.

Prabodh Kumar Pandey¹, Gilberto Gonzalez², Frederick Cheong³

¹Department of Radiological Sciences, University of California, Irvine, California 92697, USA.

Applied Physics Letters

|February 5, 2024

Summary

This summary is machine-generated.

A new proton-induced acoustic microscopy (PrAM) technique offers super-resolution, 3D imaging of biological samples. This label-free method overcomes optical limits for advanced cellular and subcellular visualization.

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Area of Science:

Biophysics
Microscopy
Biomedical Engineering

Background:

Optical microscopy is limited by diffraction to ~200 nm resolution.
High-energy ions offer shorter de Broglie wavelengths for potentially higher resolution imaging.
Current proton microscopy is transmission-based, limiting in vivo and 3D imaging capabilities.

Purpose of the Study:

To introduce proton-induced acoustic microscopy (PrAM) for label-free, super-resolution, 3D imaging.
To demonstrate PrAM's capability for in vivo studies and deeper tissue penetration compared to STIM.
To assess PrAM's feasibility and resolution limits through simulations.

Main Methods:

Pulsed proton irradiation and detection of proton-induced acoustic signals.
Coupled Monte Carlo and k-wave simulations using a proton STIM image of HeLa cells.
Reflection mode detection for in vivo suitability and deeper probing.

Main Results:

PrAM achieves label-free, super-resolution, 3D imaging in a single raster scan.
Simulations indicate sub-50 nm lateral and sub-micron axial resolution are achievable.
The technique is suitable for in vivo imaging and penetrates deeper than proton STIM.

Conclusions:

Proton-induced acoustic microscopy (PrAM) is a promising new modality for high-resolution biological imaging.
PrAM overcomes limitations of optical microscopy and existing proton microscopy techniques.
This technique can significantly enhance the understanding of cellular and subcellular processes.