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Correcting spherical aberrations in confocal light sheet microscopy: a theoretical study.

L Silvestri1, L Sacconi, F S Pavone

  • 1European Laboratory for Non-Linear Spectroscopy (LENS), University of Florence, Via Nello Carrara, 1 - 50019 Sesto Fiorentino (FI), Italy.

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Optical aberrations, not just chemical degradation, significantly reduce fluorescence signal in light sheet microscopy of cleared tissues. Correcting spherical aberration restores image quality, enabling high-resolution imaging of large biological specimens.

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Area of Science:

  • Biomedical Imaging
  • Optical Microscopy
  • Biotechnology

Background:

  • Light sheet microscopy enables high-resolution imaging of macroscopic biological specimens without sectioning.
  • Tissue clearing protocols enhance transparency but often reduce fluorescence signal.
  • Current understanding attributes signal loss primarily to fluorophore degradation by clearing solvents.

Purpose of the Study:

  • To investigate the impact of optical aberrations on signal loss in light sheet microscopy of cleared tissues.
  • To identify the role of refractive index mismatch between objectives and clearing solutions.
  • To explore methods for correcting optical aberrations and restoring image quality.

Main Methods:

  • Simulated the aberrated point spread function (PSF) of a light sheet microscope with confocal slit detection.
  • Analyzed PSF variations based on objective numerical aperture (NA) and imaging depth.
  • Investigated the efficacy of optical correction methods for spherical aberration.

Main Results:

  • Refractive index mismatch between objectives and clearing solutions causes significant spherical aberration.
  • Aberration-induced contrast loss is a critical factor in signal reduction, often overlooked.
  • Correction of second-order spherical aberration recovered quasi-diffraction-limited imaging performance.

Conclusions:

  • Optical aberrations are a major contributor to signal loss in light sheet microscopy of cleared tissues.
  • Addressing refractive index mismatch through optical correction is crucial for high-quality imaging.
  • This study highlights the importance of optical design in achieving optimal results with cleared samples.