Phase-Contrast X-Ray Imaging Using Both Vertically and Horizontally  Expanded Synchrotron Radiation X-Rays with Asymmetric Bragg Reflection

Kagoshima, Yasushi; Tsusaka, Yoshiyuki; Yokoyama, K.; Takai, Kengo; Takeda, Shingo; Matsui, Junji

doi:10.1143/jjap.38.l470

Cited by 32 publications

(18 citation statements)

References 16 publications

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“…The circumference of the specimen shows white and black contrast images and the image is reversed between Fig. 3 (a) and 3 (b) similar to previously reported results [10]. Because hydrogen charging of this specimen was carried out at 63 ℃, hydrogen atoms could not diffuse into the crystal so fast on account of the high migration energy of hydrogen (0.49 eV) [3] .…”

Section: Resultssupporting

confidence: 85%

“…This approach offers improved contrast sensitivity, especially when imaging weakly absorbing specimens. The refraction contrast X-ray imaging technique has been successfully used previously, and is seeing excellent and rapid progress as a diagnostic tool in medicine, biology and materials science, because of the application of highly parallel X-ray beams from synchrotron radiation sources [8][9][10]. Although the difference in the real part of refraction indexes between titanium and titanium-hydride is extremely small, about 10 -8 for 30 keV X-rays, we were able to visualize a high-contrast projection image of the hydride using refraction contrast radiography [11].…”

Section: Introductionmentioning

confidence: 99%

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Determination of hydrogen diffusivity depending on the hydride concentration in titanium-hydride by means of the diffraction-enhanced X-ray imaging method

Mizuno

Kanai

Hirano

et al. 2012

Trans. Mat. Res. Soc. Japan

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The X-ray refraction imaging technique was applied to the quantitative study of hydrogen diffusion in titanium-hydride. Hydrogen diffusivity in titanium-hydride was determined by direct observation of the hydride. The hydride was formed on the surface of titanium by electrolyticcharging at 63°C. The specimens were cut into 1-mm thick slices for cross-sectional observations. The hydride layer was observed using the diffraction-enhanced X-ray imaging (DEI) method with asymmetric analyzer. Boundaries between titanium and the hydride were observed as thick black or white lines parallel to the specimen surface in the DEI images similar to previously reported results. Hydride distribution caused by hydrogen diffusion from the surface was converted to the intensity profiles of refraction images of the hydride using the measured rocking curve from an analyzer.The hydrogen diffusivity was calculated from the intensity profiles using the solution of the appropriate diffusion equation. The obtained hydrogen diffusivity in titanium-hydride depended upon the hydrogen concentration.The diffusivity showed good agreement with the widely accepted values in the low hydride concentration region.

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Section: Resultssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Determination of hydrogen diffusivity depending on the hydride concentration in titanium-hydride by means of the diffraction-enhanced X-ray imaging method

Mizuno

Kanai

Hirano

et al. 2012

Trans. Mat. Res. Soc. Japan

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“…Beam magnification systems based on asymmetric Bragg crystals have been used with some success to increase imaging beam dimensions [1] [2]. But the imaging energies used at BMIT range from 40keV to 100keV and the dimensions of the Bragg crystals required to achieve the desired magnification would be very large.…”

Section: Introductionmentioning

confidence: 99%

A novel beam width doubling double crystal monochromator -some preliminary findings

Boire

Zhu

Belev

et al. 2013

J. Phys.: Conf. Ser.

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Abstract.The maximum useable beam width at the Biomedical Imaging and Therapy (BMIT) beamline at the Canadian Light Source (CLS) is suitable for most imaging applications. But access to a wider beam would benefit many programs especially computed tomography where the beam width defines the largest sample that can be imaged. A double crystal bent Laue monochromator capable of doubling the width of the incident beam is proposed; this is possible by taking advantage of symmetric off-axis, or skew reflections in the crystals. A preliminary experiment to establish proof of concept for this design has been completed using a double crystal unbent Laue system. Results are presented showing the beam width doubling from 28.3mm to 56.6mm and the effect of the skew reflections on the monochromaticity of the exit beam. Further work on this monochromator will include an investigation into the choice of reflections, a study of the effect on the change in energy across the exit beam, the development of strategies to minimize the effect of the beam overlap region downstream from the monochromator and the development of an alignment process for the double crystal bent Laue system.

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“…A synchrotron radiation source is known for its fine spatial resolution and phase-contrast imaging as well as for its highly brilliant infrared spectroscopy [1][2][3][4]. A far-IR laser by a tabletop synchrotron was proposed by Yamada in 1989 [5].…”

Section: Introductionmentioning

confidence: 99%

6 MeV storage ring dedicated to hard X-ray imaging and far-infrared spectroscopy

et al. 2011

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The tabletop storage ring, 6 MeV MIRRORCLE, is dedicated to hard X-ray imaging as well as far-infrared (FIR) spectroscopy. In spite of low electron energy, the 6 MeV MIRRORCLE generates hard X-rays ranging from 10 keV up to its electron energy and milliwatt order submillimetre range FIR rays. Bremsstrahlung is the mechanism for the hard X-ray generation. Images produced with 11× geometrical magnification display a sharply enhanced edge effect when generated using a 25 mm rod electron target. Bright far-infrared is generated in the same way using a conventional synchrotron light source, but with MIRRORCLE the spectral flux is found to be ∼1000 times greater than that of a standard thermal source. Partially coherent enhancement is observed in the case of FIR output.

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Phase-Contrast X-Ray Imaging Using Both Vertically and Horizontally Expanded Synchrotron Radiation X-Rays with Asymmetric Bragg Reflection

Cited by 32 publications

References 16 publications

Determination of hydrogen diffusivity depending on the hydride concentration in titanium-hydride by means of the diffraction-enhanced X-ray imaging method

Determination of hydrogen diffusivity depending on the hydride concentration in titanium-hydride by means of the diffraction-enhanced X-ray imaging method

A novel beam width doubling double crystal monochromator -some preliminary findings

6 MeV storage ring dedicated to hard X-ray imaging and far-infrared spectroscopy

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