Two dimensional diffraction enhanced imaging algorithm

Analyzer-based imaging provides refraction (phase) contrast due to angular filtering during reflection. By using two analyzer crystals with perpendicular diffraction planes (the so-called Bragg magnifier) the observable contrast is extended to two refraction directions. However, a nonlinear contribution of the two refraction directions to the images occurs and thus the standard diffraction-enhanced imaging algorithms are not suitable for image analysis in the case of the Bragg magnifier. Therefore, in this letter the authors introduce an algorithm (two dimensional diffraction enhanced imaging), which takes this nonlinear contribution into account and allows them to reconstruct the absorption, the horizontal, and the vertical refraction images.