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Area of Science:

  • Optical microscopy
  • Image processing

Background:

  • Spherical aberration (SA) is a known issue in microscopy, typically corrected within lens elements.
  • SA can also be induced by refractive index (RI) mismatches at interfaces between immersion media and samples.
  • RI mismatch-induced SA significantly impacts 3D imaging, quantitative measurements, and axial resolution.

Purpose of the Study:

  • To explain the origins and consequences of RI mismatch-induced SA in fluorescence microscopy.
  • To detail how this SA causes axial image distortion during z-stack acquisition.
  • To provide strategies for avoiding SA and correcting RI mismatch-induced axial distortions.

Main Methods:

  • Theoretical explanation of SA formation due to RI mismatches.
  • Analysis of the impact on z-stack acquisition and image dimensions.
  • Development and presentation of an ImageJ/Fiji-based tool for correction.

Main Results:

  • RI mismatches cause non-uniform axial translation, leading to image elongation or compression.
  • Axial sampling rates are altered, affecting the accuracy of 3D reconstructions.
  • The proposed ImageJ/Fiji tool aids in reducing volumetric measurement errors and improving axial resolution.

Conclusions:

  • RI mismatch-induced SA is a critical factor in achieving accurate 3D microscopy.
  • Understanding and correcting for RI mismatches are essential for reliable quantitative imaging.
  • Practical tools can mitigate the negative effects of SA on image fidelity and measurement accuracy.