Grid for radiography and manufacturing method thereof, and radiation imaging system
A technology of radiographic images and radiation, which is applied in the application of diffraction/refraction/reflection processing, imaging devices, diaphragms for radiation diagnosis, etc., can solve the problems of unclear X-ray intensity contours and poor grid performance, and achieve grid High-performance, image-quality-enhancing effects
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no. 1 approach
[0044] Such as figure 1 As shown, the X-ray imaging system 10 is composed of an X-ray source 11 , a source grid 12 , a first grid 13 , a second grid 14 and an X-ray image detector 15 arranged along the Z direction (X-ray propagation direction). The X-ray source 11 has, for example, a rotating anode type X-ray tube and a collimator for confining a radiation field of X-rays, and applies a cone beam of X-rays to the sample H. The X-ray image detector 15 is a flat panel detector (FPD) constituted by, for example, a semiconductor circuit, and is disposed behind the second grid 14 . The X-ray image detector 15 is connected to a phase contrast image generating section (calculation unit) 16 that generates a phase contrast image from image data detected by the X-ray image detector 15 .
[0045] The source grid 12, the first grid 13, and the second grid 14 are X-ray absorption grids, and are opposed to the X-ray source 11 in the Z direction. The first grid 13 is arranged at a distance...
no. 2 approach
[0073] In the first embodiment described above, the X-ray transmitting portion 20 is composed of the X-ray transmitting sheet 20a and the buffer layer 20b. However, as an alternative, as in Figure 8A and Figure 8B As shown in the second grid 40 of , the X-ray absorbing portion 41 may be composed of the X-ray absorbing layer 22 and the buffer layer 42 . In this case, an X-ray absorbing material made of gold, platinum, silver, or lead is dispersed in the binder used to form the buffer layer 42 so that the buffer layer 42 has X-ray absorbing properties. The X-ray transmitting sheet 20 a is formed to have a thickness corresponding to the thickness of the X-ray transmitting portion 43 . The sum of the thicknesses of the X-ray absorbing layer 22 and the buffer layer 42 corresponds to the thickness of the X-ray absorbing portion 41 . The second grid 40 of the second embodiment has the same structure as the second grid 14 of the first embodiment except for the layer structure of ...
no. 3 approach
[0076] In the above-described embodiment, the grid having the converging structure is formed by bending the laminated sheet 29 cut from the roll, but a planar grid having the converging structure may be formed. A third embodiment of the present invention will be described below. In the following description, the same reference numerals as in the first embodiment and the second embodiment refer to the same components, and a detailed description thereof will be omitted.
[0077] Such as Figure 9A and Figure 9B As shown, the second grid 50 according to the third embodiment has a plurality of X-ray absorbing portions 19 and a plurality of X-ray transmitting portions 20 extending in the Y direction and alternately arranged in the X direction. The X-ray transmitting portion 20 is composed of an X-ray absorbing sheet 20a and a buffer layer 20b. The second grid 50 has a converging structure in which the X-ray absorbing portion 19 and the X-ray transmitting portion 20 are inclined...
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