20 May 2016 Transport of intensity phase imaging using Bessel sources
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Propagation-based phase contrast using the transport of intensity equation (TIE) allows rapid, deterministic phase retrieval from defocused images. For weakly attenuating objects, phase can be retrieved from a single image. However, the TIE suffers from significant low frequency artifacts due to enhancement of noise during phase retrieval. We demonstrate that by patterning the illumination source as approximately a modified Bessel function of the 2nd kind of zero order, quantitative phase can be imaged directly at the detector within a spatial frequency band. Outside of that band, Bessel sources still improve low frequency performance in phase retrieval.
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Jonathan C. Petruccelli, Jonathan C. Petruccelli, Tonmoy Chakraborty, Tonmoy Chakraborty, } "Transport of intensity phase imaging using Bessel sources", Proc. SPIE 9870, Computational Imaging, 98700C (20 May 2016); doi: 10.1117/12.2222157; https://doi.org/10.1117/12.2222157

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