The advantage of X-ray phase imaging is its ability to obtain information on soft tissues, which is difficult
using conventional X-ray imaging. Moreover, a sharp X-ray image can be obtained from the edge effect
resulting from phase contrast. Digital tomosynthesis is an imaging technique used to reconstruct multiple
planes in a single scan. In this study, we developed an experimental system that combines the
phase-contrast and digital tomosynthesis techniques. Our experimental system consists of a
transmission-type micro-focus X-ray source (minimum focus size: 1 μm). We also introduced an indirect
conversion-type flat panel detector (pixel pitch: 50 μm, matrix size: 2366 × 2368) as an imaging device.
The sample is placed on a computer-controlled rotation table, and projection images are captured from
various angles. The images are then reconstructed using the filtered back projection method. In the
experiments, a tomosynthesis image of an acrylic phantom was obtained at a tube voltage of 40 kV and at
a maximum projection angle of ±20°. To evaluate the edge enhancement effect by phase contrast, the
resolution, degree of edge enhancement, and image contrast were measured using the acrylic phantom. A
good edge enhancement effect was confirmed under the specified conditions. Furthermore, we compared
to the shape between the projection image and the tomosynthesis image and found that the tomosynthesis
image showed high shape reproducibility compared to the conventional projection image. These results
indicate that phase-contrast digital tomosynthesis may be useful for the three-dimensional imaging of
low-contrast material.
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