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Radiography system and image-processing method therefor

A technology of radiographic images and radiation, which is applied to the equipment used for radiological diagnosis, the use of radiation for material analysis, and the use of wave/particle radiation for material analysis, etc., which can solve problems such as image quality degradation

Inactive Publication Date: 2013-04-24
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This degrades the image quality of phase contrast images

Method used

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  • Radiography system and image-processing method therefor
  • Radiography system and image-processing method therefor
  • Radiography system and image-processing method therefor

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Experimental program
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no. 1 approach ）

[0060] exist figure 1 Among them, the X-ray imaging system 10 according to the first embodiment of the present invention is provided with an X-ray source 11, an imaging unit 12, a memory 13, an image processing unit 14, an image recording unit 15, an imaging control unit 16, a console 17, and System control section 18. The X-ray source 1 irradiates the subject H with X-rays. The imaging section 12 is disposed facing the X-ray source 11 , and detects X-rays emitted from the X-ray source 11 and passing through the subject H to generate image data. The memory 13 stores image data read from the imaging unit 12 . The image processing section 14 performs image processing on a plurality of image data stored in the memory 13 to generate a phase contrast image. The image recording unit 15 stores the phase contrast image generated by the image processing unit 14 . The imaging control unit 16 controls the X-ray source 11 and the imaging unit 12 . The console 17 is provided with a m...

no. 2 approach ）

[0137] In the first embodiment, when the distance between the X-ray source 11 and the FPD 20 is elongated, the influence of the blurring of the G1 image due to the focus size (usually 0.1mm to 1mm) of the X-ray focus 11a, the phase contrast The image quality of the image may deteriorate. In the second embodiment of the present invention, as Figure 15 As shown, a multi-slit (source grid) 60 is arranged on the emission side of the x-ray source 11 . The X-ray imaging system of the second embodiment is the same as that of the first embodiment except for the multi-slit 60 .

[0138] The multi-slit 60 is an absorption type grating having a similar configuration to the first absorption type grating 21 and the second absorption type grating 22 . The multi-slit 60 has a plurality of X-ray shielding portions 61 extending in the y direction and periodically arranged in the x direction. The multi-slit 60 partially shields the X-rays from the X-ray source 11 to reduce the effective foc...

no. 3 approach ）

[0141] In the first and second embodiments, the first absorption type grid 21 is configured to linearly project X-rays passing through the X-ray low-absorption portion 21b. The present invention is not limited to this configuration. As disclosed in Japanese Patent No. 4445397, the first absorption type grid 21 may be configured to diffract X-rays to produce the so-called Talbot effect. In the third embodiment of the present invention, the first absorbing grating 21 is a diffraction grating and the distance L between the first absorbing grating 21 and the second absorbing grating 22 2 is set to the Talbot length to form a Talbot interferometer. In the present embodiment, the G1 image (self image) generated by the first grating 21 due to the Talbot effect is formed at the position of the second absorption type grating 22 .

[0142] In this embodiment, the first absorption type grating 21 may be a phase type grating (phase type diffraction grating). In this case, the thickness...

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Abstract

The invention prevents generation of artifacts due to variations in grid position between pre-imaging and imaging. Boundary lines at which values change from p / 2 to - p / 2 or from -p / 2 to p / 2 for the first phase differential image formed during pre-imaging without the subject and for the second phase differential image formed during imaging with the subject in place are determined, and first stair step data and second stair step data that change by p or - p each time a boundary line is crossed in a prescribed direction are respectively prepared. The first stair step data is added to the first phase differential image to form a first summed phase differential image and the second stair step data is added to the second phase differential image to form a second summed phase differential image. A corrected phase differential image is formed by subtracting the first summed phase differential image from the second summed phase differential image.

Description

technical field [0001] The present invention relates to a radiographic system for taking images of a subject using radiation and an image processing method for the radiographic system, and more particularly to a radiographic system for using the fringe scanning method and image processing for the radiographic system for using the fringe scanning method method. Background technique [0002] Radiation (such as X-rays) is attenuated according to the atomic number, density and thickness of the elements that make up the material. By utilizing such characteristics, X-rays are used as probes for examining the inside of a subject in medical diagnosis and non-destructive inspection. [0003] A general X-ray imaging system takes a transmission image of an object disposed between an X-ray source that emits X-rays and an X-ray image detector that detects X-rays. The substance placed on the path towards the X-ray image detector attenuates the X-rays emitted from the X-ray source toward...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/00
CPCA61B6/484A61B6/5264A61B6/4291A61B6/5235A61B6/00G01N23/04A61B6/488G01N23/041
Inventor 石井裕康
Owner FUJIFILM CORP
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