Phase tomography using an x-ray Talbot interferometer

Momose, Atsushi; Kawamoto, Shinya; Koyama, Ichiro; Suzuki, Yoshio

doi:10.1117/12.557572

Cited by 40 publications

(21 citation statements)

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“…Since this method allows the amount of phase shift due to the interaction between X-rays and matter to appear conspicuously, it improves the sensitivity by 1,000 times (Momose and Fukuda 1995) in comparison with that obtained through conventional absorptivity-dependent contrasts, thereby leading to a substantial reduction in X-ray irradiation. Different methods using information on the phase of X-rays are available; however, we propose a method using an X-ray Talbot interferometer (David et al 2002;Momose et al 2004;Momose 2005). Setup of an X-ray Talbot interferometer is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of X-rays mask with carbon membrane for diffraction gratings

et al. 2010

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We have produced diffraction gratings for obtaining high resolution X-ray phase imaging, such as X-ray Talbot interferometer. These diffraction gratings were required to have a fine, high accuracy, high aspect ratio structure. Therefore, we decided to use the X-rays lithography technique that used synchrotron radiation of the directivity for a manufacture process. The accuracy of the completed structure depends largely on the accuracy of the X-ray mask. In our group, a resin material is conventionally used for the membrane of large X-ray masks. However, X-ray masks comprising a resin membrane have the disadvantage that, after several cycles of X-ray exposure, they crease and sag due to X-ray-derived heat. As a substitute for the conventional resin membrane, we experimentally fabricated a new X-ray mask using a carbon wafer membrane. The newly fabricated X-ray mask was subjected to X-ray exposure experiment. We succeeded in making the structure body which was almost shape. And the experimental results verified that the new mask did not deteriorate even when used repeatedly, demonstrating that it was highly durable.

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Section: Introductionmentioning

confidence: 99%

Fabrication of X-rays mask with carbon membrane for diffraction gratings

et al. 2010

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“…Hard X-ray phase contrast imaging (PCI) developed slowly until the third-generation synchrotron radiation sources were put into wide practice. Various hard X-ray phase-contrast imaging methods, such as the interferometer-based 1 , propagation-based 2 , analyser-based 3,4 , and grating-based methods 5,6 , have been implemented to obtain highly sensitive phase contrast images, especially for low-Z samples. Basic experiments have made great success in the applications in various fields, including medicine, biology and chemistry, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Among various PCI methods, hard X-ray grating-based imaging has the most potential for clinical applications. David et al 5 , Momose et al 6 and Weitkamp et al 7 firstly implemented the X-ray grating-based PCI method on synchrotron radiation sources. Their methods are based on the Talbot theory and they all rely on the highly coherence of synchrotron radiation sources.…”

Section: Introductionmentioning

confidence: 99%

Multi-scale image fusion for x-ray grating-based mammography

et al. 2012

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X-ray phase contrast imaging (PCI) can provide high sensitivity of weakly absorbing low-Z objects in medical and biological fields, especially in mammography. Grating-based differential phase contrast (DPC) method is the most potential PCI method for clinic applications because it can works well with conventional X-ray tube and it can retrieve attenuation, DPC and dark-field information of the samples in a single scanning. Three kinds of information have different details and contrast which represent different physical characteristics of X-rays with matters. Hence, image fusion can show the most desirable characteristics of each image.In this paper, we proposed a multi-scale image fusion for X-ray grating-based DPC mammography. Firstly, non-local means method is adopted for denoising due to the strong noise, especially for DPC and dark-field images. Then, Laplacian pyramid is used for multi-scale image fusion. The principal component analysis (PCA) method is used on the high frequency part and the spatial frequency method is used on the low frequency part. Finally, the fused image is obtained by inverse Laplacian pyramid transform. Our algorithm is validated by experiments. The experiments were performed on mammoDPC instrumentation at the Paul Scherrer Institut in Villigen, Switzerland. The results show that our algorithm can significantly show the advantages of three kinds of information in the fused image, which is very helpful for the breast cancer diagnosis.

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“…The Talbot effect, and the closely related Lau effect in which a second grating is placed in the region where the self-image would be formed, have been widely used recently as the basis of systems for phase-contrast imaging with X-rays (e.g. Momose et al 2004;Pfeiffer et al 2008). The main difference between the interference pattern used here and that produced by the classical Talbot effect is that true self-imaging of a grating by the Talbot effect only occurs at certain wavelength dependent distances.…”

Section: Relationship To Talbot-lau Interferometrymentioning

confidence: 99%

X-ray interferometry with transmissive beam combiners for ultra-high angular resolution astronomy

Skinner

Krizmanic

2009

Exp Astron

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Interferometry provides one of the possible routes to ultra-high angular resolution for X-ray and gamma-ray astronomy. Sub-micro-arc-second angular resolution, necessary to achieve objectives such as imaging the regions around the event horizon of a super-massive black hole at the center of an active galaxy, can be achieved if beams from parts of the incoming wavefront separated by 100s of meters can be stably and accurately brought together at small angles. One way of achieving this is by using grazing incidence mirrors. We here investigate an alternative approach in which the beams are recombined by optical elements working in transmission. It is shown that the use of diffractive elements is a particularly attractive option. We report experimental results from a simple 2-beam interferometer using a low-cost commercially available profiled film as the diffractive elements. A rotationally symmetric filled (or mostly filled) aperture variant of such an interferometer, equivalent to an X-ray axicon, is shown to offer a much wider bandpass than either a Phase Fresnel Lens (PFL) or a PFL with a refractive lens in an achromatic pair. Simulations of an example system are presented. Keywords

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Phase tomography using an x-ray Talbot interferometer

Cited by 40 publications

References 0 publications

Fabrication of X-rays mask with carbon membrane for diffraction gratings

Fabrication of X-rays mask with carbon membrane for diffraction gratings

Multi-scale image fusion for x-ray grating-based mammography

X-ray interferometry with transmissive beam combiners for ultra-high angular resolution astronomy

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