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![[Figure 6]](mo5009fig6mag.jpg)
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Figure 6
Quantitative phase retrieval. Top: projection radiograph of a glass capillary, taken with monochromatic X-rays of 17 keV and at a sample–detector distance of 15 mm. The image has been corrected for dark signal and flat-field-normalized. The grayscale image shows the transmission signal I/I0, scaled between 0.4 (black) and 1.3 (white). The length of the scale bar is 200 µm. Center: image after phase reconstruction using Paganin's formula. The gray levels represent reconstructed values of the projected glass thickness between 0 (black) and 0.4 mm (white). Bottom: section profile line through the reconstructed projection image (at the position indicated by the dashed white line in the radiograph), and expected profile (red) for a capillary of outer diameter 0.765 mm and wall thickness 57 µm. The X-ray optical properties used in the reconstruction were those from the DABAX database (Sanchez del Rio & Dejus, 1998  ) for SiO2 with a density of 2.4 g cm−3 at 17 keV: δ = 1.73 × 10−6, β = 5.01 × 10−9. Data taken at ESRF-ID22 with an effective pixel size of 0.7 µm. |
![[Figure 6]](mo5009fig6.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
