Experimental imaging study demonstrates high-resolution three-dimensional tomography in a polymer blend using a single phase grating, highlighting sensitive detection of weakly absorbing materials.
X-ray phase imaging with a single phase grating based on the fractional Talbot effect is described. A phase grating with an 8 µm pitch was placed behind a weakly absorbing object and illuminated with partially coherent 17.7 keV X-rays. Intensity patterns downstream of the grating were recorded with a high-resolution image detector. By the fringe scanning method, an X-ray wavefront inclination by the object was obtained. Phase tomography was performed and the three-dimensional structure of a piece of a polymer blend was revealed with an 8 µm spatial resolution and a 9 mg/cm 3 detection limit of density deviation.
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Takeda et al. (2007) studied this question.
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