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Journal of Biomedical Optics

Characterization of a three-dimensional double-helix point-spread function for fluorescence microscopy in the presence of spherical aberration
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Paper Abstract

We characterize the three-dimensional (3-D) double-helix (DH) point-spread function (PSF) for depth-variant fluorescence microscopy imaging motivated by our interest to integrate the DH-PSF in computational optical sectioning microscopy (COSM) imaging. Physical parameters, such as refractive index and thickness variability of imaging layers encountered in 3-D microscopy give rise to depth-induced spherical aberration (SA) that change the shape of the PSF at different focusing depths and render computational approaches less practical. Theoretical and experimental studies performed to characterize the DH-PSF under varying imaging conditions are presented. Results show reasonable agreement between theoretical and experimental DH-PSFs suggesting that our model can predict the main features of the data. The depth-variability of the DH-PSF due to SA, quantified using a normalized mean square error, shows that the DH-PSF is more robust to SA than the conventional PSF. This result is also supported by the frequency analysis of the DH-PSF shown. Our studies suggest that further investigation of the DH-PSF’s use in COSM is warranted, and that particle localization accuracy using the DH-PSF calibration curve in the presence of SA can be improved by accounting for the axial shift due to SA.

Paper Details

Date Published: 20 March 2013
PDF: 11 pages
J. Biomed. Opt. 18(3) 036010 doi: 10.1117/1.JBO.18.3.036010
Published in: Journal of Biomedical Optics Volume 18, Issue 3
Show Author Affiliations
Sreya Ghosh, Univ. of Memphis (United States)
Chrysanthe Preza, Univ. of Memphis (United States)

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