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Virtual grid imaging method and system used for eliminating influence of scattered radiation

一种散射辐射、成像方法的技术，应用在用于放射诊断的仪器、使用辐射进行材料分析、应用等方向，能够解决辐射伤害加大、加大X射线检测设备制造成本等问题，达到降低射线剂量、消除散射线影响、提高对比度和信噪比的效果

Active Publication Date: 2008-01-23
TCL HEALTHCARE EQUIP SHANGHAI CO LTD
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Problems solved by technology

This will bring about two adverse consequences. On the one hand, the radiation damage to the objects to be inspected, especially patients and medical staff, will be increased. On the other hand, the requirements for X-ray tubes and high-voltage generators will be increased, thereby increasing Increase the manufacturing cost of X-ray inspection equipment

Method used

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  • Virtual grid imaging method and system used for eliminating influence of scattered radiation
  • Virtual grid imaging method and system used for eliminating influence of scattered radiation
  • Virtual grid imaging method and system used for eliminating influence of scattered radiation

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Embodiment Construction

[0044] The basic idea of ​​the present invention is that in the process of high-energy ray imaging, for images that have been affected by scattered radiation, the method of digital signal processing is used to eliminate the "scattering fog" superimposed on the radiography image, so as to improve the contrast and signal noise of the high-energy ray image Compare. The high-energy rays here include but are not limited to X-rays, gamma rays, and the like. However, in the following specific embodiments, the most widely used X-ray will be used as an example for illustration.

[0045] Fig. 1 shows an embodiment of the "virtual grid" imaging system provided by the present invention. The system includes an X-ray tube 1 as a high-energy ray emitting unit, an X-ray detector 7 , an image acquisition and preprocessing correction unit 8 , a virtual grid unit 9 , an image postprocessing unit 10 and an image display unit 11 . Referring to FIG. 1 , an X-ray beam 3 is emitted from a focal poi...

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Abstract

The invention discloses an imaging method and system for a virtual screen grid that can remove any radiation and scattering effect. The method is essentially used in a high-energy ray imaging. The scattering rays arriving at the detector surface are not filtered first, all the scattering rays and direct-emitting rays are sampled, then the sampled data go through separation and suppression of the components of scattering rays, so as to remove the components of scattering rays in the images. The procedures are: (1) a digital image is discomposed into a multi-frequency image from high to low frequency; (2) the low-frequency images are de-scattered; (3) the contrast of the hi-frequency images are enhanced; (4) images of different frequencies got by (2) and (3) are combined, and output images are formed. According to experiments, in digital X-ray imaging, the invention can obviously remove the radiation and scattering effect, and can greatly reduce the dosage of rays, which is 1 / 3 of ordinary screen grid with a given image brightness.

Description

technical field [0001] The present invention relates to a virtual grid imaging method and imaging system capable of eliminating the influence of scattered radiation, in particular to a virtual grid imaging method capable of eliminating the influence of scattered radiation produced by high-energy rays such as X-rays and gamma rays passing through an object to be inspected. A grid imaging method and an imaging system belong to the technical field of digital image processing. Background technique [0002] High-energy rays including X-rays and gamma rays have a strong penetrating ability and can penetrate many substances that are opaque to visible light, such as ink paper, wood, etc. Using this penetrating ability, these high-energy rays are used to help people in medical diagnosis and treatment; for inspection of non-destructive materials in industry; in the fields of basic science and applied science, they are widely used in crystal structure analysis, And chemical analysis a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/04G06T5/00
CPCG06T2207/30004G06T2207/10116G06T2207/20016G06T5/003G06T5/50A61B6/5282G06T5/002G03B42/02A61B6/00G06T5/008G06T5/001G06T5/94G06T5/73G06T5/70
Inventor 李运祥曹红光
Owner TCL HEALTHCARE EQUIP SHANGHAI CO LTD
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