Investigation of Dependence on the Object Orientation in Visibility-Contrast Imaging with the X-Ray Talbot-Lau Interferometer

Abstract

Visibility-contrast image obtained by the X-ray grating interferometer reflects reduction of coherence due to the object’s structures. In the case of the one-dimensional grating, visibility-contrast image is affected by relative angle between the structures of the object and the grating. In this study, we have investigated the features of the visibility-contrast signal at the edge of the object. We imaged the acrylic cylinder with the Talbot-Lau interferometer (Konica Minolta, Inc.) by rotating from -90 degrees to +90 degrees with respect to the grating’s periodic direction, and measured its edge signal. The signal became its maximum at -90 degrees and +90 degrees, and became zero at 0 degree. This result showed a good agreement with the angle dependency of the x-ray refraction at the edge of the cylindrical structure.