Precision in iterative modulation enhanced single-molecule localization microscopy

Area of Science:

• Super-resolution microscopy
• Optical imaging
• Biophysics

Background:

• Modulation-enhanced single-molecule localization microscopy (meSMLM) improves localization precision using patterned illumination.
• Iterative meSMLM (imeSMLM) refines emitter position estimation through iterative prior information generation.

Purpose of the Study:

• To bound the theoretical localization precision of imeSMLM methods using the Van Trees inequality (VTI).
• To evaluate the impact of illumination pattern strategies on localization precision via simulations.
• To compare the performance of imeSMLM and standard SMLM under realistic conditions.

Main Methods:

• Analytical approximation of localization precision bounds using the VTI.
• Monte Carlo simulations to assess achievable precision with varying illumination patterns.
• Evaluation of imeSMLM performance considering background noise, modulation contrast, and photon rates.

Main Results:

• Under ideal conditions, photon information in imeSMLM increases exponentially with iterations.
• Non-ideal factors (background, imperfect modulation) limit this exponential increase.
• imeSMLM with two iterations shows a fivefold improvement over SMLM at 8 background photons and 95% modulation contrast.
• Reduced signal photon rates in imeSMLM can negate benefits over SMLM in equal measurement times.

Conclusions:

• The VTI is a valuable tool for assessing imeSMLM performance and optimizing illumination control.
• Practical limitations necessitate careful consideration of measurement time and illumination power when comparing SMLM and imeSMLM.
• Further research into illumination control strategies is crucial for maximizing imeSMLM potential.