Combination of scattering-projection interleaving and random down-sampling for compressive confocal Raman imaging

Area of Science:

• Spectroscopy
• Chemical Imaging
• Optical Engineering

Background:

• Raman hyperspectral imaging offers rich chemical information but suffers from slow acquisition speeds.
• Compressive sensing strategies, like the SIRI method, have been developed to accelerate data acquisition.
• Existing methods face limitations in further reducing acquisition time and expanding imaging regions.

Purpose of the Study:

• To develop an advanced compressive Raman imaging technique for faster data acquisition.
• To improve reconstruction fidelity and expand the imaging capabilities of Raman hyperspectral imaging.
• To investigate the combined effect of scattering-projection interleaving and spatial down-sampling.

Main Methods:

• Implementation of a modified Single-beam Interference Raman Imaging (SIRI) method.
• Combining scattering-projection interleaving with random spatial down-sampling.
• Experimental validation of the modified SIRI technique for data compression and reconstruction.

Main Results:

• Achieved significant reduction in data acquisition time for Raman hyperspectral imaging.
• Demonstrated superior reconstruction fidelity compared to the precursor SIRI method at moderate down-sampling rates.
• Reported an experimental maximum compression ratio of 80, enabling efficient data handling.

Conclusions:

• The modified SIRI method offers a substantial advancement in accelerating Raman hyperspectral imaging.
• This technique allows for faster imaging and broader spatial coverage without compromising data quality.
• The findings pave the way for more efficient and practical applications of compressive Raman spectroscopy.