US 2019/0056336 A1 · Radiation Phase Contrast Imaging Device

Abstract

[PROBLEM TO BE SOLVED] To provide a radiation phase contrast imaging device having a small device configuration [SOLVING MEANS] The present invention focused on the findings that the distance between the phase grating 5 and the FPD 4 does not need to be the Talbot distance. The distance between the phase grating 5 and the FPD 4 can be more freely set. However, a self-image cannot be detected unless the self-image is sufficiently magnified with respect to the phase grating 5. The degree on how much the self-image is magnified on the FPD 4 with respect to the original phase grating 5 is determined by a magnification ratio X2/X1. Therefore, in the present invention, the magnification ratio is set to be the same as the magnification ratio in a conventional configuration. With this, even if the distance X2 between the radiation source 3 and the FPD 4 is reduced, a situation in which the self-image cannot be detected by the FPD 4 due to the excessively small size thereof does not occur.

Claims8

Dependent claims

A radiation phase contrast imaging device comprising:

a radiation source configured to irradiate radiation;
a grating in which absorbers extending in one direction configured to absorb the radiation are arranged in a direction orthogonal to the one direction;
and
a detecting portion configured to detect a self-image of the grating caused by a Talbot interference at a detection surface for detecting the radiation,
wherein when a distance from the radiation source to the detection portion is X2 and a distance from the radiation source to the grating is X1, X2-X1 is set to a distance different from the Talbot distance in a state in which a magnification ratio X2/X1 showing how much the self-image of the grating which appears at the detection portion in a device configuration in which X2-X1 is set to the Talbot distance is magnified with respect to the grating is maintained constant.

2 more elements

A radiation phase contrast imaging device comprising:

a radiation source configured to irradiate radiation;
a grating in which absorbers extending in one direction configured to absorb the radiation are arranged in a direction orthogonal to the one direction;
and
a detecting portion configured to detect a self-image of the grating caused by a Talbot interference at a detection surface for detecting the radiation,
wherein when a distance from the radiation source to the detection portion is X2 and a distance from the radiation source to the grating is X1, X2-X1 is set to a distance different from a Talbot distance by setting a magnification ratio X2/X1 showing how much the self-image of the grating which appears in the detection portion in a device configuration in which X2-X1 is set to a Talbot distance is magnified with respect to the grating to a magnification ratio between from an upper limit magnification ratio in which a stripe patterned dark line configuring the self-image is magnified by ½ of a width of a detection element arrayed in the detection portion at an end portion of the self-image in which a positional deviation becomes largest due to a variation of the magnification ratio to a lower limit magnification ratio in which the dark line is narrowed by the ½ of the width of the detection element.

2 more elements

Dependencies are inferred from the claim text.

Radiation Phase Contrast Imaging Device

Life of this patent

Radiation Phase Contrast Imaging Device

Life of this patent

Abstract

Claims8