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![[Figure 2]](vl5055fig2mag.jpg)
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Figure 2
Optimization of the q range. (a) The MD of the background region [red boxes in panel (c)] is plotted against the magnitude of the scattering vector q. The vertical red dashed lines correspond to the selected q values in (b) and (c). The chosen q range (yellow), reaches from q2 to q3. (b) Summed scattering pattern from 40000 individual patterns of the whole detector view (left) and an enlarged view (right). The beamstop and aperture-edge artefacts are masked and shown in white. (c) Series of X-ray dark-field contrast images obtained with varying maximum q values qi as shown in panel (b); q0 is the scattering center, q1 is the minimum radius at which scattering signals appear, q2 is a circumscribed circle of the beamstop (ignoring neighboring artefacts), q3 is the minimum of the MD curve in panel (a), q4 corresponds to the maximum circle within the detector area and q5 corresponds to the whole detector area. In each case the minimum q value used for the calculation of the dark-field image is q0. The scanning is performed with 0.5 µm × 0.5 µm step size and 5 ms of exposure. Scale bars are 20 µm. |
![[Figure 2]](vl5055fig2.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
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