High-precision 3D drift correction with differential phase contrast images.

Area of Science:

• Optical Microscopy
• Biophysics
• Super-resolution Imaging

Background:

• Single molecule localization microscopy (SMLM) requires long acquisition times, leading to sample drift and reduced image quality.
• Existing drift correction methods, like bright-field image correlation, are limited by low image contrast, especially for feature-poor samples.
• Accurate drift estimation is crucial for stabilizing microscopes and improving SMLM resolution.

Purpose of the Study:

• To develop a more precise and robust 3D drift correction method for SMLM.
• To overcome the contrast limitations of traditional bright-field image correlation methods.
• To enable high-quality SMLM imaging of biological samples lacking distinct morphological features.

Main Methods:

• Utilized differential phase contrast (DPC) microscopy to enhance image contrast.
• Developed a 3D drift correction algorithm leveraging DPC imaging.
• Validated the method using SMLM imaging of microtubules.

Main Results:

• Achieved a drift correction precision of less than 6 nm in both lateral and axial directions.
• Demonstrated suitability for biological samples lacking clear morphological features.
• Showcased comparable drift estimation performance to redundant cross-correlation methods.

Conclusions:

• Differential phase contrast (DPC) microscopy significantly enhances drift estimation accuracy in SMLM.
• The proposed DPC-based 3D drift correction method offers high precision and robustness.
• This technique improves SMLM image quality, particularly for challenging biological samples.