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. Author manuscript; available in PMC: 2019 Dec 27.
Published in final edited form as: Phys Med Biol. 2015 Mar 24;60(8):3031–3043. doi: 10.1088/0031-9155/60/8/3031

Figure 1.

Figure 1.

Cross-grating and along-grating motionless electromagnetic phase stepping (EPS) in a Talbot–Lau Interferometer. (a) In cross-grating EPS, the x-ray focal spot is shifted by a magnetic field B along the X axis, so that the spot moves along the Y axis, perpendicular to the grating lines. The moiré fringe lines on the detector are horizontal. The sample projection is shifted vertically across the fringe lines. (b) In along-grating EPS, the x-ray focal spot is stepped along the X axis in the direction parrallel to the grating lines. Slight rotations of G0 and G2 about the Z axis result in vertical moiré fringes, and the sample projection is moved horizontally across the fringes.