An improved phase shift reconstruction algorithm of fringe scanning technique for X-ray microscopy

The Review of Scientific Instruments
S LianW Yashiro

Abstract

The X-ray phase imaging method has been applied to observe soft biological tissues, and it is possible to image the soft tissues by using the benefit of the so-called "Talbot effect" by an X-ray grating. One type of the X-ray phase imaging method was reported by combining an X-ray imaging microscope equipped by a Fresnel zone plate with a phase grating. Using the fringe scanning technique, a high-precision phase shift image could be obtained by displacing the grating step by step and measuring dozens of sample images. The number of the images was selected to reduce the error caused by the non-sinusoidal component of the Talbot self-image at the imaging plane. A larger number suppressed the error more but increased radiation exposure and required higher mechanical stability of equipment. In this paper, we analyze the approximation error of fringe scanning technique for the X-ray microscopy which uses just one grating and proposes an improved algorithm. We compute the approximation error by iteration and substitute that into the process of reconstruction of phase shift. This procedure will suppress the error even with few sample images. The results of simulation experiments show that the precision of phase shift image reconstruct...Continue Reading

References

Nov 1, 1985·Applied Optics·K A Stetson, W R Brohinsky
Aug 8, 2005·Optics Express·Timm WeitkampEric Ziegler
Dec 12, 2012·Physics in Medicine and Biology·Alberto BravinPekka Suortti
Feb 13, 2014·The Review of Scientific Instruments·Shashidhara MaratheLeslie G Butler

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