Journal
JOURNAL OF RAMAN SPECTROSCOPY
Volume 49, Issue 10, Pages 1660-1667Publisher
WILEY
DOI: 10.1002/jrs.5450
Keywords
confocal Raman imaging; cross-talk; multi-beam; optical sectioning; single cell imaging
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Funding
- Engineering and Physical Sciences Research Council [EP/L025620/1, EP/M506588/1]
- EPSRC [EP/L025620/1] Funding Source: UKRI
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In this study, we compared the depth discrimination and speed performance of multifoci Raman hyperspectral imaging with the reference standard of a single laser point confocal Raman mapping. A liquid crystal spatial light modulator was employed for the generation of multifoci laser beams, and a digital micromirror device was used as a software-configurable reflective pinhole array. The patterns of the laser foci and pinhole array can be rapidly changed without requiring any hardware alterations. Confocal patterns with different distance-to-size ratios were tested and compared. After optimization of the laser-foci pattern, we demonstrated the feasibility of multifoci Raman hyperspectral microscopy for recording depth-resolved molecular maps of biological cells (Acanthamoeba castellanii trophozoites). Micrometric depth discrimination and short acquisition times (20min for single plane confocal image) were achieved.
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