Enhanced quantitative X-ray phase-contrast images using Foucault differential filters

Abstract

Enhanced quantitative X-ray phase-contrast (QXPC) imaging is implemented with a Foucault knife-edge array filter (FKAF), which is a real differential spatial filter. The intensities of Foucault differential filtering (FDF) are acquired according to the linear translation of the FKAF along the axes. The FDF using the FKAF scheme for obtaining the QXPC images is demonstrated by a stereoscopic rendering of the quantitative phase images of the tail fin of an anchovy containing soft and hard components in specimen. FDF is a noninterferometric quantitative phase-imaging method that depicts quantitative phase images and renders stereoscopic images.

Quantitative contrast enhancement imaging for phase retrieval based on synthetic diffraction pattern

“…In addition to the above approach which excludes the strong probe diffraction pattern, modulation is another promising approach to enhance the SNR. This can be achieved by applying a random hole array to randomize the probe [16], a cylindrical object to generate an in-line reference wave [17], or a Zernike phase dot to provide aπ/2 phase shift at the focal plane [18,19]. These novel methods are efficient and improve the capability of imaging weakly scattering specimens using CDI with electrons or x-rays.…”