# Revealing hidden tissue architecture with mid-infrared dichroism photoacoustic microscopy

## TL;DR

This paper introduces a new imaging technique that reveals tissue structure and composition without labels.

## Contribution

The novel MIR-DS-PAM method combines mid-infrared and polarization-resolved photoacoustics for label-free imaging.

## Key findings

- MIR-DS-PAM enables visualization of molecular composition in tissues.
- The method also captures fiber alignment in engineered tissues.
- This approach supports quantitative histopathology analysis.

## Abstract

By combining mid-infrared excitation with polarization-resolved photoacoustics, Park et al. introduce a novel label-free approach to visualize both molecular composition and fiber alignment in engineered tissues. This dual-contrast framework, termed MIR-DS-PAM, offers a new path toward analytical, quantitative histopathology.