High-dynamic-range coherent diffractive imaging: Ptychography using the mixed-mode pixel array detector

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Coherent (X-ray) diffractive imaging (CDI) is an increasingly popular form of X-ray microscopy, mainly due to its potential to produce high-resolution images and the lack of an objective lens between the sample and its corresponding imaging detector. One challenge, however, is that very high dynamic range diffraction data must be collected to produce both quantitative and high-resolution images. In this work, hard X-ray ptychographic coherent diffractive imaging has been performed at the P10 beamline of the PETRAIII synchrotron to demonstrate the potential of a very wide dynamic range imaging X-ray detector (the Mixed-Mode Pixel Array Detector, or MM-PAD). The detector is capable of single photon detection, detecting fluxes exceeding 1 × 10<sup>8</sup> 8-keV photons pixel<sup>-1</sup> s<sup>-1</sup> , and framing at 1kHz. A ptychographic reconstruction was performed using a peak focal intensity on the order of 1 × 10 10 photons μm<sup>-2</sup> s<sup>-1</sup> within an area of approximately 325nm × 603nm. This was done without need of a beam stop and with a very modest attenuation, while 'still' images of the empty beam far-field intensity were recorded without any attenuation. The treatment of the detector frames and CDI methodology for reconstruction of non-sensitive detector regions, partially also extending the active detector area, are described. © 2014 International Union of Crystallography.




Giewekemeyer, K., Philipp, H. T., Wilke, R. N., Aquila, A., Osterhoff, M., Tate, M. W., … Mancuso, A. P. (2014). High-dynamic-range coherent diffractive imaging: Ptychography using the mixed-mode pixel array detector. Journal of Synchrotron Radiation, 21(5), 1167–1174. https://doi.org/10.1107/S1600577514013411

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