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X-ray Talbot-Lau interferometer has been used widely to conduct phasecontrast imaging with a conventional low-brilliance x-ray source. Typically, inthis technique, background correction has to be performed in order to obtainthe pure signal of the sample under inspection. In this study, we reported on aresearch on the background correction strategies within this technique,especially we introduced a new phase unwrapping solution for one conventionalbackground correction method, the key point of this new solution is changingthe initial phase of each pixel by a cyclic shift operation on the raw imagescollected in phase stepping scan. Experimental result and numerical analysisshowed that the new phase unwrapping algorithm could successfully subtractcontribution of the system's background without error. Moreover, a potentialadvantage of this phase unwrapping strategy is that its effective phasemeasuring range could be tuned flexibly in some degree for example to be(-pi+3, pi+3], thus it would find usage in certain case because measuring rangeof the currently widely used background correction method is fixed to be (-pi,pi].

Research on the background correction method in x-ray phase contrast imaging with Talbot-Lau interferometer