Tuning axial and lateral localization precision in 3D super-resolution microscopy with variable astigmatism

Area of Science:

• Microscopy and Imaging Technologies
• Biophysics
• Optical Physics

Background:

• Astigmatism imaging is a 3D single-molecule fluorescence microscopy technique.
• It provides super-resolved spatial information rapidly from single images.
• It is suitable for sub-micrometer structures and millisecond temporal dynamics.

Purpose of the Study:

• To investigate the inter-dependencies of precision in x, y, and z dimensions during astigmatism imaging.
• To understand how astigmatism, z-position, and photon count affect imaging precision.
• To provide experimental guidance for selecting optimal astigmatism parameters in biological imaging.

Main Methods:

• Utilized astigmatism imaging, a 3D single-molecule fluorescence microscopy approach.
• Employed adaptive optics to tune astigmatism for experimental needs.
• Experimentally verified the relationships between precision and imaging parameters.

Main Results:

• Demonstrated that x, y, and z precisions are inter-linked in astigmatism imaging.
• Showed that precision varies significantly with the level of astigmatism applied.
• Quantified the impact of z-position and photon count on spatial resolution.

Conclusions:

• The precision of 3D single-molecule fluorescence microscopy is critically dependent on astigmatism settings.
• Adaptive optics offers tunable astigmatism for optimizing biological imaging.
• This study provides an experimentally validated framework for selecting astigmatism parameters to enhance imaging strategies.