SPECTROSCOPY, IMAGING, OTHER TECHNIQUES |
Three-dimensional Resolution Doubling in Widefield Fluorescence Microscopy by Structured Illumination
Mats G.L. Gustafsson 1*, Lin Shao 1, Peter M. Carlton 1, C. J. Rachel Wang 2, Inna N. Golubovskaya 2, W. Zacheus Cande 2, David A. Agard 1 and John W. Sedat 1
1 University of California, San Francisco
2 University of California, Berkeley
* To whom correspondence should be addressed. E-mail: mats{at}msg.ucsf.edu.
Submitted on August 24, 2007
Revised on September 26, 2007
Accepted on 6 November 2007
 |
Abstract |
|---|
Structured illumination microscopy is a method that can increase the spatial resolution of wide-field fluorescence microscopy beyond its classical limit by using spatially structured illumination light. Here we describe how this method can be applied in three dimensions to double the axial as well as the lateral resolution, with true optical sectioning. A grating is used to generate three mutually coherent light beams, which interfere in the specimen to form an illumination pattern that varies both laterally and axially. The spatially structured excitation intensity causes normally unreachable high-resolution information to become encoded into the observed images through spatial frequency mixing. This new information is computationally extracted and used to generate a three-dimensional reconstruction with twice as high resolution, in all three dimensions, as is possible in a conventional widefield microscope. The method has been demonstrated on both test objects and biological specimens, and has produced the first light microscopy images of the synaptonemal complex in which the lateral elements are clearly resolved.
Key Words:
HELM, cytoskeleton, microtubules, patterned excitation, super-resolution, synaptonemal complex
