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Open Access Highly Accessed Original article

A high-density 3D localization algorithm for stochastic optical reconstruction microscopy

Hazen Babcock12*, Yaron M Sigal12 and Xiaowei Zhuang1234*

Author Affiliations

1 Center for Brain Science, Harvard University, Cambridge, MA 02138, USA

2 Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA

3 Department of Physics, Harvard University, Cambridge, MA 02138, USA

4 Howard Hughes Medical Institute, Cambridge, MA 02138, USA

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Optical Nanoscopy 2012, 1:6  doi:10.1186/2192-2853-1-6

Published: 16 July 2012

Abstract

Background

Stochastic optical reconstruction microscopy (STORM) and related methods achieves sub-diffraction-limit image resolution through sequential activation and localization of individual fluorophores. The analysis of image data from these methods has typically been confined to the sparse activation regime where the density of activated fluorophores is sufficiently low such that there is minimal overlap between the images of adjacent emitters. Recently several methods have been reported for analyzing higher density data, allowing partial overlap between adjacent emitters. However, these methods have so far been limited to two-dimensional imaging, in which the point spread function (PSF) of each emitter is assumed to be identical.

Methods

In this work, we present a method to analyze high-density super-resolution data in three dimensions, where the images of individual fluorophores not only overlap, but also have varying PSFs that depend on the z positions of the fluorophores.

Results and conclusion

This approach accurately analyzed data sets with an emitter density five times higher than previously possible with sparse emitter analysis algorithms. We applied this algorithm to the analysis of data sets taken from membrane-labeled retina and brain tissues which contain a high-density of labels, and obtained substantially improved super-resolution image quality.