Search Results for author: Chris Jacobsen

Found 4 papers, 3 papers with code

A matrix-free Levenberg-Marquardt algorithm for efficient ptychographic phase retrieval

1 code implementation27 Feb 2021 Saugat Kandel, S. Maddali, Youssef S G Nashed, Stephan O Hruszkewycz, Chris Jacobsen, Marc Allain

The phase retrieval problem, where one aims to recover a complex-valued image from far-field intensity measurements, is a classic problem encountered in a range of imaging applications.

Retrieval

Near, far, wherever you are: simulations on the dose efficiency of holographic and ptychographic coherent imaging

1 code implementation16 Aug 2019 Ming Du, Doga Gursoy, Chris Jacobsen

Different studies in x-ray microscopy have arrived at conflicting conclusions about the dose efficiency of imaging modes involving the recording of intensity distributions in the near (Fresnel regime) or far (Fraunhofer regime) field downstream of a specimen.

Image and Video Processing Applied Physics Medical Physics

Three dimensions, two microscopes, one code: automatic differentiation for x-ray nanotomography beyond the depth of focus limit

2 code implementations24 May 2019 Ming Du, Youssef S. G. Nashed, Saugat Kandel, Doga Gursoy, Chris Jacobsen

Conventional tomographic reconstruction algorithms assume that one has obtained pure projection images, involving no within-specimen diffraction effects nor multiple scattering.

Image and Video Processing Applied Physics Optics

Quantifying mesoscale neuroanatomy using X-ray microtomography

no code implementations13 Apr 2016 Eva L. Dyer, William Gray Roncal, Hugo L. Fernandes, Doga Gürsoy, Vincent De Andrade, Rafael Vescovi, Kamel Fezzaa, Xianghui Xiao, Joshua T. Vogelstein, Chris Jacobsen, Konrad P. Körding, Narayanan Kasthuri

Methods for resolving the 3D microstructure of the brain typically start by thinly slicing and staining the brain, and then imaging each individual section with visible light photons or electrons.

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