Dual-modality SEM-Raman smart scanning for fast hyperspectral Raman micro-imaging - application to bones

Area of Science:

• Spectroscopy and Imaging
• Materials Science
• Biomedical Engineering

Background:

• Raman micro-imaging offers detailed chemical information but suffers from long acquisition times.
• Smart scanning techniques aim to reduce acquisition time by focusing on essential data.
• Previous protocols combined spectral and spatial compression, with a low-SNR initial scan as a bottleneck.

Purpose of the Study:

• To accelerate Raman micro-imaging by optimizing a previously proposed smart scanning protocol.
• To replace the time-consuming low-signal-to-noise ratio (SNR) initial scan with a faster imaging modality.
• To evaluate the impact of this modification on data quality and clinical relevance.

Main Methods:

• Replaced the initial low-SNR Raman scan with scanning electron microscopy (SEM) in a two-pass imaging protocol.
• Acquired and analyzed biomedical data (bone samples) using the modified protocol.
• Correlated SEM data with Raman spectral information.

Main Results:

• The new protocol achieved a three-fold reduction in acquisition time compared to the original method.
• Reconstructed Raman spectra exhibited limited distortion.
• The clinical value of extracted information from bone samples was preserved.

Conclusions:

• Replacing the initial low-SNR scan with SEM is an effective strategy to accelerate Raman micro-imaging.
• This optimized protocol maintains data integrity and clinical relevance.
• The method shows potential for accelerating other slow spectral imaging techniques.