CN114114441B - Data processing method for inhibiting electromagnetic interference of X-ray digital detector - Google Patents
Data processing method for inhibiting electromagnetic interference of X-ray digital detector Download PDFInfo
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- CN114114441B CN114114441B CN202111395454.XA CN202111395454A CN114114441B CN 114114441 B CN114114441 B CN 114114441B CN 202111395454 A CN202111395454 A CN 202111395454A CN 114114441 B CN114114441 B CN 114114441B
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- 238000003672 processing method Methods 0.000 title claims abstract description 21
- 230000002401 inhibitory effect Effects 0.000 title abstract description 8
- 238000001914 filtration Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 238000001228 spectrum Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 230000002452 interceptive effect Effects 0.000 description 2
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- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 238000009825 accumulation Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/42—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
- A61B6/5211—Devices using data or image processing specially adapted for radiation diagnosis involving processing of medical diagnostic data
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
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- G06T5/70—
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10116—X-ray image
Abstract
The invention relates to the technical field of signal processing, and discloses a data processing method for inhibiting electromagnetic interference of an X-ray digital detector, which comprises the following steps: accumulating and integrating the X-rays through a detector; reading out image data acquired by a detector array based on the sequence of a preset pseudo-random sequence table; the read data is rearranged back to the normal order and the restored image is output. The invention can effectively inhibit the electromagnetic interference of the X-ray digital detector and acquire clear images.
Description
Technical Field
The invention relates to the technical field of signal processing, in particular to a data processing method for inhibiting electromagnetic interference of an X-ray digital detector.
Background
X-ray imaging technology has found widespread use in the fields of medicine, security and industrial detection, while digital X-ray detectors are the main component of X-ray imaging. The digital X-ray detector is easy to be affected by electromagnetic interference during operation, the source components of the electromagnetic interference are complex, various components inside or outside the system can generate electromagnetic signals, the electromagnetic signals are transmitted to a detector circuit through radiation or wires, and the acquisition of the signals of the detector is interfered. For X-ray imaging systems, typical electromagnetic interference comes from the high voltage inverter of the X-ray generator. The main effect of electromagnetic interference is to superimpose stripes of specific frequencies on the acquired image.
Therefore, how to provide a data processing method for suppressing electromagnetic interference of an X-ray digital detector to reduce the influence of electromagnetic interference on an image is a technical problem to be solved.
Disclosure of Invention
The invention aims to provide a data processing method for inhibiting electromagnetic interference of an X-ray digital detector so as to reduce the influence of the electromagnetic interference on an image.
To this end, according to a first aspect, an embodiment of the present invention discloses a data processing method for suppressing electromagnetic interference of an X-ray digital detector, including: accumulating and integrating the X-rays through a detector;
reading out image data acquired by a detector array based on the sequence of a preset pseudo-random sequence table;
the read data is rearranged back to the normal order and the restored image is output.
The invention is further configured to, after the image data collected by the detector array is read out in the order based on the preset pseudo-random sequence table, further include:
performing notch filtering processing on the read data;
and reordering the filtered data according to a pseudo-random sequence table used during the reading of the detector, and outputting a filtered restored image.
The invention further provides that the pseudo-random sequence list is arranged in a disordered manner.
The invention is further arranged that the image data comprises each pixel value of the image.
The invention is further arranged to perform a notch filter process on the read data by means of a notch filter.
The invention further provides that the notch filter is a band reject filter with extremely narrow reject band.
The invention has the following beneficial effects: the embodiment of the invention discloses a data processing method for inhibiting electromagnetic interference of an X-ray digital detector, which integrates the X-rays through the detector; reading out image data acquired by a detector array based on the sequence of a preset pseudo-random sequence table; the read data is rearranged back to the normal order and the restored image is output. Compared with the prior art, the invention can effectively inhibit the electromagnetic interference of the X-ray digital detector and acquire clear images.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a data processing method for suppressing electromagnetic interference of an X-ray digital detector disclosed in the present embodiment;
FIG. 2 is a flow chart of another data processing method for suppressing electromagnetic interference of an X-ray digital detector disclosed in this embodiment;
FIG. 3 is a schematic diagram of a pseudo-random sequence table in a data processing method for suppressing electromagnetic interference of an X-ray digital detector according to the present embodiment;
FIG. 4 is a flow chart of notch filtering in a data processing method for suppressing electromagnetic interference of an X-ray digital detector according to the present embodiment;
FIG. 5 is a flow chart of notch filtering in another data processing method for suppressing electromagnetic interference of an X-ray digital detector according to the present embodiment;
FIG. 6 is a schematic diagram showing the effect of an interference signal on sequential and out-of-order reads;
fig. 7 is a schematic diagram of another application of the data processing method for suppressing electromagnetic interference of the X-ray digital detector disclosed in this embodiment.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The embodiment of the invention discloses a data processing method for inhibiting electromagnetic interference of an X-ray digital detector, which is shown in figure 1 and comprises the following steps:
step S101, integrating the X-rays in an accumulation way through a detector;
step S102, reading out image data acquired by a detector array based on the sequence of a preset pseudo-random sequence table;
step S103 rearranges the read data back to the normal order and outputs a restored image.
It should be noted that, in the data processing method for suppressing electromagnetic interference of the X-ray digital detector disclosed in the embodiment of the present invention, the X-rays are integrated by the detector; reading out image data acquired by a detector array based on the sequence of a preset pseudo-random sequence table; the read data is rearranged back to the normal order and the restored image is output. Compared with the prior art, the invention can effectively inhibit the electromagnetic interference of the X-ray digital detector and acquire clear images.
As shown in fig. 2, after step S102, further includes:
step S104, notch filtering processing is carried out on the read data;
step S105, reorders the filtered data according to the pseudo random sequence table used in the detector reading, and outputs a filtered restored image.
In a specific implementation process, as shown in fig. 3, the pseudo-random sequence table is arranged in a disordered manner.
It should be noted that the sequence of the pseudo-randomly out-of-order read detector data is completely disturbed, and this process is called interleaving. After the interleaved data is transmitted to the image processing unit, the data can be rearranged back into the normal order by the pseudo-random sequence used in the interleaving process, which is called de-interleaving. The electromagnetic interference signal is introduced during signal reading, i.e. into the interleaved signal. In the de-interleaving process, the image signal is restored, and the relatively fixed frequency interfering signal is disturbed into a completely disordered white noise.
In a specific implementation, the image data includes each pixel value of the image.
In a specific implementation process, the read data is subjected to notch filtering processing by a notch filter.
In the implementation process, the notch filter is a band reject filter with extremely narrow reject band.
FIG. 4 is a flow chart of notch filtering in a data processing method for suppressing electromagnetic interference of an X-ray digital detector according to the present embodiment; fig. 5 is a flowchart of notch filtering in another data processing method for suppressing electromagnetic interference of an X-ray digital detector according to the present embodiment.
As shown in fig. 4, the peak frequency is extracted in the current frame, which is suitable for the situations that the electromagnetic interference intensity is large and the interference frequency changes with time. After the uniform signals are read out in disorder, the original signals are scrambled into white noise, the frequency spectrum is uniformly distributed, and the interference signals are directly overlapped on the interleaved signals, so that the frequency spectrum characteristics are not changed. After fourier transformation is performed on the superimposed signals, if the interference signal strength is high, the interference signal will form a peak on the frequency spectrum, and the position where the peak is located can be regarded as the frequency point of the interference signal. After finding out the interference frequency points, notch filtering is carried out on the interference frequency points.
As shown in fig. 5, the peak frequency is obtained by pre-scanning the uniform substance, and this method is suitable for the situation that the electromagnetic interference frequency is completely fixed, and has no requirement on the interference intensity. The pre-scanning is performed before the formal scanning, and the pre-scanning can scan the material with uniform material or completely shading scanning by using a beam splitter. After the pre-scanned image is subjected to fourier transform and the direct current component is removed, the remaining frequency spectrum can be regarded as the frequency spectrum of the superposition of the interference signal and the noise, and the peak on the frequency spectrum can be regarded as an interference frequency point. In the normal scanning, notch filtering is performed on the interleaved signal, and the notch frequency point is the interference frequency point identified in the pre-scanning.
As shown in fig. 6, fig. 6 shows how interleaving and de-interleaving turn an interfering signal into unordered white noise. In normal sequential scanning, the interference signal with a fixed frequency is directly superimposed on the original image (the interference intensity mask in the schematic diagram represents the superimposed intensity of the interference signal at each pixel of the image, and in this example, the influence of the interference signal on the upper left region of the image is greater), and the influence of the interference signal can be clearly seen from the last superimposed image. If the original image is interleaved, then the interference signals are superimposed, after the reverse interleaving ordering, the interference signals are scrambled into white noise, and only slight white noise is left at the upper left of the restored image.
Fig. 7 is a schematic view of notch filtering effect. After interleaving, the original image is scrambled into a disordered white noise image, the spectrum distribution is uniform, and the electromagnetic interference signal is superimposed on the interleaved image, and the original spectrum is still maintained. Electromagnetic interference signals are typically derived from some fixed frequency interference source and are superimposed by a single or multiple fixed frequency spectrums. The interleaved image subjected to electromagnetic interference is subjected to one-dimensional or two-dimensional Fourier transformation to obtain a frequency domain signal, then one or more frequency points where the interference signal is located are subjected to notch suppression, most of the interference signal can be suppressed, and meanwhile loss of original image information is small. After the image subjected to notch filtering is subjected to the inverse interleaving rearrangement, white noise remained after the interference signal is disturbed is relatively weakened.
Working principle: the embodiment of the invention discloses a data processing method for inhibiting electromagnetic interference of an X-ray digital detector, which integrates the X-rays through the detector; reading out image data acquired by a detector array based on the sequence of a preset pseudo-random sequence table; the read data is rearranged back to the normal order and the restored image is output. Compared with the prior art, the invention can effectively inhibit the electromagnetic interference of the X-ray digital detector and acquire clear images.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (5)
1. A data processing method for suppressing electromagnetic interference of an X-ray digital detector, comprising:
accumulating and integrating the X-rays through a detector;
reading out image data acquired by a detector array based on the sequence of a preset pseudo-random sequence table;
rearranging the read data back to the normal order and outputting a restored image;
after the image data collected by the detector array is read out based on the sequence of the preset pseudo-random sequence table, the method further comprises the following steps:
performing notch filtering processing on the read data;
and reordering the filtered data according to a pseudo-random sequence table used during the reading of the detector, and outputting a filtered restored image.
2. The method for processing data for suppressing electromagnetic interference of an X-ray digital detector according to claim 1, wherein the pseudo-random sequence list is a disordered array.
3. The method of claim 1, wherein the image data includes each pixel value of an image.
4. The data processing method for suppressing electromagnetic interference of an X-ray digital detector according to claim 1, wherein the read-out data is subjected to notch filter processing by a notch filter.
5. The method for processing data for suppressing electromagnetic interference of a digital X-ray detector as set forth in claim 4, wherein said notch filter is a band reject filter having an extremely narrow reject band.
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| US4979111A (en) * | 1985-02-13 | 1990-12-18 | Hitachi Medical Corporation | CT image processor using data expansion for reducing structural noise in rearrangement |
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| JP2005006232A (en) * | 2003-06-16 | 2005-01-06 | Iwatsu Electric Co Ltd | Method and apparatus of generating periodic pseudo noise |
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| JP2012037526A (en) * | 2003-06-17 | 2012-02-23 | Microsoft Corp | Methods and devices for improved charge management for three-dimensional and color sensing |
| CN102783958A (en) * | 2011-04-29 | 2012-11-21 | 通用电气公司 | Radiological image noise reduction system and method |
| CN109495204A (en) * | 2018-11-13 | 2019-03-19 | 深圳市金城保密技术有限公司 | A kind of video information electromagnetic exposure interference method, terminal device and storage medium |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3944173B2 (en) * | 2004-02-05 | 2007-07-11 | キヤノン株式会社 | Radiation image processing apparatus and processing method |
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- 2021-11-23 CN CN202111395454.XA patent/CN114114441B/en active Active
Patent Citations (7)
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|---|---|---|---|---|
| US4979111A (en) * | 1985-02-13 | 1990-12-18 | Hitachi Medical Corporation | CT image processor using data expansion for reducing structural noise in rearrangement |
| JPH09247473A (en) * | 1996-03-07 | 1997-09-19 | Minolta Co Ltd | Image forming device |
| JP2005006232A (en) * | 2003-06-16 | 2005-01-06 | Iwatsu Electric Co Ltd | Method and apparatus of generating periodic pseudo noise |
| JP2012037526A (en) * | 2003-06-17 | 2012-02-23 | Microsoft Corp | Methods and devices for improved charge management for three-dimensional and color sensing |
| CN101807880A (en) * | 2009-12-17 | 2010-08-18 | 北京交通大学 | Gaussian white noise generator and implement method thereof |
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