Detector for drift of X-ray fan and corresponding line scan imaging apparatus

A drift detector and imaging device technology, applied in the field of radiation detection, can solve the problem of low accuracy, and achieve the effect of correcting image quality degradation and improving image quality

Pending Publication Date: 2019-04-02
THE FIRST RES INST OF MIN OF PUBLIC SECURITY +1
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Problems solved by technology

At present, operators can only indirectly infer the alignment relationship between the linear array detector and the physical position of the X-ray fan by observing the amplitude of the output signal of the linear array detector (or its signal-to-noise ratio curve), and the accuracy is not high

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  • Detector for drift of X-ray fan and corresponding line scan imaging apparatus
  • Detector for drift of X-ray fan and corresponding line scan imaging apparatus
  • Detector for drift of X-ray fan and corresponding line scan imaging apparatus

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Embodiment Construction

[0037] The technical content of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] like image 3 As shown, the X-ray sector drift detector provided by the present invention includes a digital signal processing module 8 and two detection modules, each of which is connected to the digital signal processing module 8 respectively. The detection module is used to receive X-ray fan irradiation, generate an electrical signal analog quantity proportional to the X-ray intensity, and output signal digital quantity after signal amplification and analog-to-digital conversion processing; the digital signal processing module 8 is used to The difference between the digital signals output by the two detection modules is used to calculate the output value of the X-ray sector drift detector.

[0039] In the embodiment of the present invention, the centerlines of the two detection modules in the width di...

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Abstract

The invention discloses a detector for the drift of a X-ray fan and a corresponding line scan imaging apparatus. The detector for the drift of the X-ray fan comprises a digital signal processing module and two detecting modules. Each detecting module is separately connected to the digital signal processing module, and simultaneously illuminated by the X-ray fan. Each detection module is configuredto receive X-ray fan illumination, and to generate a digital quantity of the signal proportional to the intensity of the X-ray. The digital signal processing module is configured to determine whetherthere is a drift in the physical position of the X-ray fan according to the difference between the digital quantities of the signals output by the two detecting modules. The output result of the detector can directly reflect the alignment of the position of a line detector and the X-ray fan, and also be used for establishing a correspondence between the direction and extent of drift and the change degree of the output signal of the line detector. Therefore, the image quality degradation caused by the physical position drift of the X-ray fan is accurately corrected.

Description

technical field [0001] The invention relates to an X-ray fan plane drift detector, and also relates to a line scanning imaging device including the X-ray fan plane drift detector, belonging to the technical field of radiation detection. Background technique [0002] The degradation of image quality caused by the focal spot drift of the X-ray tube is a common problem in existing line scan imaging equipment such as X-ray security inspection machines. Moreover, research on its working mechanism shows that focal spot drift is an inherent physical phenomenon of existing X-ray tubes. In various security inspection occasions, it is common that the inspected items are continuous, the X-ray tube continues to emit beams for a long time, and the linear array detector has no chance to correct the signal in time, the signal of the linear array detector gradually changes is inevitable. [0003] Therefore, in the PCT international application (PCT / US95 / 14411) filed by ANALOGIC CORPORATION...

Claims

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Application Information

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IPC IPC(8): G01N23/04G01V13/00G01V5/00
CPCG01N23/04G01V13/00G01N2223/03G01N2223/1016G01N2223/303G01V5/22
Inventor 廖建新董明文孔维武高峰
Owner THE FIRST RES INST OF MIN OF PUBLIC SECURITY
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