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Sökning: WFRF:(Aslan Selin)

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1.
  • Aslan, Selin, et al. (författare)
  • Joint ptycho-tomography reconstruction through alternating direction method of multipliers
  • 2019
  • Ingår i: Optics Express. - 1094-4087. ; 27:6, s. 9128-9143
  • Tidskriftsartikel (refereegranskat)abstract
    • We present the extension of ptychography for three-dimensional object reconstruction in a tomography setting. We describe the alternating direction method of multipliers (ADMM) as a generic reconstruction framework to efficiently solve the nonlinear optimization problem. In this framework, the ADMM breaks the joint reconstruction problem into two well-defined subproblems: ptychographic phase retrieval and tomographic reconstruction. In this paper, we use the gradient descent algorithm to solve both problems and demonstrate the efficiency of the proposed approach through numerical simulations. Further, we show that the proposed joint approach relaxes existing requirements for lateral probe overlap in conventional ptychography. Thus, it can allow more flexible data acquisition.
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2.
  • Ching, Daniel, et al. (författare)
  • Time-coded aperture for x-ray imaging
  • 2019
  • Ingår i: Optics Letters. - 0146-9592. ; 44:11, s. 2803-2806
  • Tidskriftsartikel (refereegranskat)abstract
    • We describe a computational imaging system for x-ray tomography, where image capture and post-processing are co-designed to improve final image quality when relative motion of an experiment’s components during a single exposure causes motion blur. The idea is based on temporally encoding the motion during each exposure by fluttering the detector shutter open and closed with a known sequence for guaranteeing an invertible motion blur kernel. While generally applicable, we demonstrate our approach by simulating blurry data acquisition for transmission x-ray tomography and deblurring the reconstructed images. The results suggest that optimized pseudo-random binary time-coded apertures can yield successful reconstructions independent of the size of the blur kernel. This Letter is especially relevant to high-speed x-ray tomography applications where time-resolution is limited by the detector or available photon flux.
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Aslan, Selin (2)
Nikitin, Viktor (2)
Ching, Daniel J. (1)
Bicer, Tekin (1)
Leyffer, Sven (1)
Gürsoy, Doga (1)
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Ching, Daniel (1)
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