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Scanning hard x-ray differential phase contrast imaging with a double wedge absorber
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10.1063/1.3095440
/content/aip/journal/rsi/80/3/10.1063/1.3095440
http://aip.metastore.ingenta.com/content/aip/journal/rsi/80/3/10.1063/1.3095440
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic illustration of the experimental setup (a) consisting of a double multilayer monochromator, a KB mirror, slits, sample stage, three ionization chambers (IC1, IC2, and IC3) and an x-ray photodiode, two wedge absorbers, and a vacuum path. (b) Schematic illustration of the wedge absorber 1. and are intensities of x-rays with and without the sample. is displacement between the reference x-rays and x-rays refracted by the sample. is the vertex angle of the wedge absorber.

Image of FIG. 2.
FIG. 2.

Relationship between natural logarithmic function of recorded x-ray intensity and . The solid line is the best-fitting line of the data.

Image of FIG. 3.
FIG. 3.

Images of the cross point of a nylon mesh. (a) An absorption image. The calibration bar shows the transmittance of x-rays. (b) A differential phase contrast image in the -direction in . (c) A differential phase contrast image in the -direction in . The step size of the sample was for the - and -directions and the exposure time for one step was 1 s. The scale bar is .

Image of FIG. 4.
FIG. 4.

A phase map reconstructed by the line integration method in rad. The scale bar is .

Image of FIG. 5.
FIG. 5.

Mirror reflection image of the differential phase contrast image that is shown in Fig. 3(c) in the -direction in .

Image of FIG. 6.
FIG. 6.

A phase map reconstructed by Fourier integration method in rad. The scale bar is .

Image of FIG. 7.
FIG. 7.

Images of polystyrene spheres on glass of 1 mm thickness. (a) An absorption image. The calibration bar shows the transmittance of x-ray. (b) A differential phase contrast image in the -direction in . (c) A differential phase contrast image in the -direction in . The scale bar is .

Image of FIG. 8.
FIG. 8.

Phase maps of polystyrene spheres on glass reconstructed by the line integration method for the differential image in the -direction (a) and Fourier integration method (b). (c) Line profile of the white dashed line. The scale bar is . The open circles and line are the measured and calibrated values of the quantities of phase, respectively.

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/content/aip/journal/rsi/80/3/10.1063/1.3095440
2009-03-30
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Scanning hard x-ray differential phase contrast imaging with a double wedge absorber
http://aip.metastore.ingenta.com/content/aip/journal/rsi/80/3/10.1063/1.3095440
10.1063/1.3095440
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