Gamma photon positioning method and device for pixel type cadmium zinc telluride detector

Abstract

The invention relates to a gamma photon positioning method and device for a pixel type cadmium zinc telluride detector. The method comprises the following steps: determining a target pixel anode interacting with gamma rays in the pixel type detector, the position of the target pixel anode and the side length of the target pixel anode; acquiring an arrangement number of a target pixel anode; determining induction signal amplitude values corresponding to a plurality of first pixel anodes, determining that the first pixel anodes are second pixel anodes if the array numbers are smaller than the target pixel anodes, and determining that the first pixel anodes are third pixel anodes if the array numbers are larger than the target pixel anodes; and determining a position correction value and determining a target position of the gamma photons based on a difference value between the induction signal amplitude value corresponding to the third pixel anode and the induction signal amplitude value corresponding to the second pixel anode and the side length of the target pixel anode. The purpose of determining the deviation correction value by considering the side length of the pixel anode and the induction signal amplitude value of the adjacent pixel anode is achieved, and therefore the technical effects that the deviation correction value is determined more accurately, and the target position is obtained more accurately are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of pixel-type cadmium zinc telluride detectors, and in particular to a method and device for positioning gamma photons in pixel-type cadmium zinc telluride detectors. Background Art

[0002] Cadmium zinc telluride (CZT) belongs to the II-VI group of compounds. This material possesses exceptional properties, including a large relative atomic number, a wide bandgap, high resistivity, and low leakage current. Combined with a carefully designed electrode structure, it can achieve excellent energy and spatial resolution. In the field of nuclear radiation imaging, this detector is highly sought after for its high performance. Acquiring positional information from the interaction between a CZT detector and gamma rays is a core technology for achieving high-precision imaging, dynamic monitoring, and three-dimensional positioning, and has far-reaching implications for medical diagnosis, industrial testing, nuclear safety, and scientific research. This capability is of great significance to medical diagnosis, industrial testing, nuclear safety, and scientific research.

[0003] In the related art, during the use of a pixel-type cadmium zinc telluride (CZT) detector, the spacing between adjacent square electrodes in the electrode structure is set to a fixed value, and the deviation correction value is also set to a fixed value, resulting in errors in obtaining the position information of the interaction between the pixel-type cadmium zinc telluride (CZT) detector and gamma rays, resulting in inaccurate position information acquisition.

[0004] In the patent application publication number "CN114515160A", the deviation calibration of the position information of the pixel-type cadmium zinc telluride detector is achieved by considering the change of the deviation correction value. However, the correction value in this patent is only a positive value. For example, when the induction signal is generated only on Cn, it is believed that the position should be at the center of the electrode strip, that is, the correction amount is P / 2. However, the correction amount calculated by the formula given in the patent is P, and the case where the correction value is a negative value is not considered. That is, only the adjacent electrodes of the electrode to be measured in the predetermined direction are considered, resulting in large errors in the actual measurement process.

[0005] In the related art, when obtaining position information of the interaction between a pixel-type cadmium zinc telluride (CZT) detector and gamma rays, the deviation correction is set to a fixed value or only the deviation in a predetermined direction is considered, resulting in inaccurate target position acquisition.

[0006] The above problems need to be solved urgently. Summary of the Invention

[0007] The invention discloses a pixel-type cadmium zinc telluride detector gamma photon positioning method and device, aiming to solve the technical problems existing in the prior art.

[0008] The present invention adopts the following technical solutions:

[0009] On the one hand, the present invention provides a method for locating gamma photons in a pixel-type cadmium zinc telluride detector, comprising: determining a target pixel anode interacting with gamma rays in the pixel-type detector, a position of the target pixel anode, and a side length of the target pixel anode, wherein the target pixel anode is used to indicate a pixel anode in the pixel-type detector that is primarily sensitive to the gamma rays; obtaining an arrangement number of the target pixel anode, wherein the arrangement number includes a row number and a column number; determining amplitude values of sensing signals corresponding to a plurality of first pixel anodes, wherein the plurality of first pixel anodes are used to indicate pixel anodes adjacent to the target pixel anode, and the plurality of first pixel anodes include a second pixel anode having an arrangement number smaller than the target pixel anode and a third pixel anode having an arrangement number larger than the target pixel anode; determining a position correction value based on a difference between an amplitude value of the sensing signal corresponding to the third pixel anode and an amplitude value of the sensing signal corresponding to the second pixel anode, and the side length of the target pixel anode; and determining a target position of the gamma photon based on the position of the target pixel anode and the position correction value, wherein the gamma photon is generated by the interaction between the pixel-type detector and the gamma rays.

[0010] Optionally, before determining the target pixel anode interacting with the gamma ray in the pixel-type detector, the position of the target pixel anode, and the side length of the target pixel anode, the method further includes: constructing an (x, y) coordinate system; placing the pixel-type detector and the gamma ray in the coordinate system, wherein the pixel-type detector includes a plurality of pixel anodes arranged in a regular quadrilateral.

[0011] Optionally, determining the sensing signal amplitude values corresponding to the multiple first pixel anodes includes: the multiple first pixel anodes include eight, specifically including two pixel anodes in the same row and adjacent columns as the target pixel anode, also including two pixel anodes in the same column and adjacent rows as the target pixel anode, and also including four pixel anodes in adjacent columns and adjacent rows as the target pixel anode; determining the sensing signal amplitude values corresponding to each of the eight first pixel anodes.

[0012] Optionally, when the interaction process between the pixel-type detector and the gamma ray is placed in the coordinate system, including the x-coordinate position and the y-coordinate position, the position correction value is determined based on the difference between the sensing signal amplitude value corresponding to the third pixel anode and the sensing signal amplitude value corresponding to the second pixel anode, and the side length of the target pixel anode, including: determining a first difference between the sensing signal amplitude value corresponding to the third pixel anode with a row number greater than the target pixel anode and the sensing signal amplitude value corresponding to the second pixel anode with a row number less than the target pixel anode among the multiple first pixel anodes; determining a first difference between the sensing signal amplitude value corresponding to the third pixel anode with a row number greater than the target pixel anode and the sensing signal amplitude value corresponding to the second pixel anode with a row number less than the target pixel anode among the multiple first pixel anodes. and value; determining a first weight coefficient for x-coordinate position correction based on a first ratio of the first difference and the first sum; determining a second difference between the sensing signal amplitude value corresponding to the third pixel anode whose column number is greater than the target pixel anode among the multiple first pixel anodes and the sensing signal amplitude value corresponding to the second pixel anode whose column number is less than the target pixel anode; determining a second sum of the sensing signal amplitude value corresponding to the third pixel anode whose column number is greater than the target pixel anode and the sensing signal amplitude value corresponding to the second pixel anode whose column number is less than the target pixel anode among the multiple first pixel anodes; determining a second weight coefficient for y-coordinate position correction based on a second ratio of the second difference and the second sum; determining the position correction value based on the first weight coefficient, the second weight coefficient and the side length of the target pixel anode.

[0013] Optionally, when the position correction includes correcting the x-coordinate position and correcting the y-coordinate position, and the position correction value includes the x-coordinate correction value and the y-coordinate correction value, determining the position correction value based on the first weight coefficient, the second weight coefficient and the side length of the target pixel anode includes: determining a first length from the center position of the target pixel anode to the edge line of the target pixel anode based on half the side length of the target pixel anode; determining the x-coordinate correction value based on the product of the first weight coefficient and the first length; and determining the y-coordinate correction value based on the product of the second weight coefficient and the first length.

[0014] Optionally, determining the target position of the gamma photon based on the position of the target pixel anode and the position correction value includes: determining a first distance from the edge of the second pixel anode to the edge of the pixel-type detector based on the position of the target pixel anode, and a second distance from the center position of the target pixel anode to the edge of the second pixel anode, wherein the second pixel anode is the pixel anode with row number 1; determining the target position of the gamma photon based on the first distance, the second distance and the position correction value.

[0015] Optionally, determining the second distance from the center position of the target pixel anode to the edge line of the second pixel anode includes: determining a first length from the center position of the target pixel anode to the edge line of the target pixel anode based on half of the side length of the target pixel anode; determining a first number of pixel anodes between the target pixel anode and the second pixel anode; determining a second length of the sum of the side lengths of multiple pixel anodes from the center position of the target pixel anode to the second pixel anode based on the first number and the first length; determining a gap size between two adjacent pixel anodes; determining a third length of the gap from the center position of the target pixel anode to the second pixel anode based on the gap size and the first number; and determining the second distance based on the second length and the third length.

[0016] Optionally, when the target position includes an x-coordinate position and a y-coordinate position, and the position correction value includes an x-coordinate correction value and a y-coordinate correction value, determining the target position of the gamma photon based on the first distance, the second distance and the position correction value includes: determining the x-coordinate position of the gamma photon based on the first distance, the second distance and the x-coordinate correction value; determining the y-coordinate position of the gamma photon based on the first distance, the second distance and the y-coordinate correction value.

[0017] According to another aspect of an embodiment of the present invention, a pixel-type cadmium zinc telluride detector gamma photon positioning device is provided, comprising: a data determination module for determining a target pixel anode interacting with gamma rays in the pixel-type detector, a position of the target pixel anode, and a side length of the target pixel anode; a number acquisition module for acquiring an arrangement number of the target pixel anode; an amplitude value determination module for determining amplitude values of sensing signals corresponding to a plurality of first pixel anodes, wherein the plurality of first pixel anodes are used to indicate pixel anodes adjacent to the target pixel anode, and the plurality of first pixel anodes include a second pixel anode having an arrangement number smaller than that of the target pixel anode and a third pixel anode having an arrangement number larger than that of the target pixel anode; a correction module for determining a position correction value based on a difference between an amplitude value of the sensing signal corresponding to the third pixel anode and an amplitude value of the sensing signal corresponding to the second pixel anode, and the side length of the target pixel anode; and a position acquisition module for determining a target position of a gamma photon based on the position of the target pixel anode and the position correction value, wherein the gamma photon is generated by the interaction between the pixel-type detector and the gamma rays.

[0018] According to another aspect of an embodiment of the present invention, a non-volatile storage medium is provided, wherein the non-volatile storage medium stores a plurality of instructions, wherein the instructions are suitable for being loaded by a processor and executed by any one of the methods for positioning gamma photons in a pixel-type cadmium zinc telluride detector.

[0019] The technical solution adopted by the present invention can achieve at least one of the following beneficial effects:

[0020] In an embodiment of the present invention, a target pixel anode interacting with a gamma ray in a pixel-type detector is determined, along with the position of the target pixel anode and the side length of the target pixel anode; the arrangement number of the target pixel anode is obtained; the amplitude values of sensing signals corresponding to a plurality of first pixel anodes are determined, wherein the plurality of first pixel anodes are used to indicate pixel anodes adjacent to the target pixel anode, and the plurality of first pixel anodes include a second pixel anode having an arrangement number smaller than the target pixel anode and a third pixel anode having an arrangement number larger than the target pixel anode; a position correction value is determined based on the difference between the amplitude values of the sensing signals corresponding to the third pixel anode and the amplitude values of the sensing signals corresponding to the second pixel anode, as well as the side length of the target pixel anode; and a target position of a gamma photon generated by the interaction between the pixel-type detector and the gamma ray is determined based on the position of the target pixel anode and the position correction value. This method achieves the purpose of determining a deviation correction value by considering the side length of the pixel anode and the amplitude values of the sensing signals of adjacent pixel anodes, thereby achieving the technical effect of more accurate determination of the deviation correction value and more accurate target position acquisition, thereby solving the technical problem of inaccurate target position acquisition caused by the deviation correction being a fixed value or only considering deviations in a predetermined direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments, which constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0022] Figure 1 This is a flow chart of a method for positioning gamma photons in a pixel-type cadmium zinc telluride detector in Example 1 of the present invention;

[0023] Figure 2 This is a structural diagram of a pixel-type detector in a method for positioning gamma photons using a pixel-type cadmium zinc telluride detector in Example 1 of the present invention;

[0024] Figure 3 Schematic diagram of the position of the pixel anode of a pixel-type detector in a method for positioning gamma photons of a pixel-type cadmium zinc telluride detector in Example 1 of the present invention;

[0025] Figure 4 Schematic diagram of the position of the target pixel anode in a pixel-type cadmium zinc telluride detector gamma photon positioning method in Example 1 of the present invention;

[0026] Figure 5 It is a structural schematic diagram of a pixel-type cadmium zinc telluride detector gamma photon positioning device in Example 3 of the present invention. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. In the description of the present invention, it should be noted that the term "or" is generally used in the sense of including "and / or" unless the content clearly indicates otherwise.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a magnetic connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly specified and limited.

[0029] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] First, to facilitate understanding of the embodiments of the present invention, some of the terms or nouns involved in the present invention are explained below:

[0031] Pixel-based CdZnTe detectors are based on the interaction between semiconductor materials and incident particles (such as X-rays and gamma rays). When particles enter the CZT material, energy deposition causes electrons to transition from the valence band to the conduction band, forming electron-hole pairs. Under the influence of an applied electric field, the electrons and holes separate and migrate, generating a measurable electrical signal. The pixel-based design achieves sensitive three-dimensional position detection by collecting the pixel coordinates of the carriers.

[0032] Gamma photons are essentially high-energy photons, a type of electromagnetic radiation with extremely short wavelengths (<0.001 nanometers) and extremely high energies (>100 keV). They are produced by atomic nuclear decay or high-energy physics processes such as nuclear reactions or particle accelerators. Pixel-type cadmium zinc telluride (CZT) detectors are ideal for gamma photon detection due to their high resolution, room-temperature operation, and direct energy conversion properties.

[0033] To solve the problems existing in the prior art, the embodiments of the present application provide a method and device for positioning gamma photons in a pixel-type cadmium zinc telluride detector.

[0034] Example 1

[0035] This embodiment provides a pixel-type CdZnTe detector gamma photon positioning method, such as Figure 1 As shown, Figure 1 This is a flow chart of a method for positioning gamma photons in a pixel-type cadmium zinc telluride detector in Example 1 of the present invention, the method comprising:

[0036] Step S102, determining a target pixel anode that interacts with the gamma ray in the pixel-type detector, a position of the target pixel anode, and a side length of the target pixel anode, wherein the target pixel anode is used to indicate a pixel anode that mainly senses the gamma ray in the pixel-type detector;

[0037] Optional, such as Figure 2 As shown, Figure 2 This is a diagram of the pixel detector structure used in the gamma photon localization method for a pixel-type cadmium zinc telluride detector in Example 1 of the present invention. The pixel detector uses a room-temperature semiconductor cadmium zinc telluride material as its substrate. On one surface of the pixel detector, a regular quadrilateral pixel electrode serves as the detector's pixel anode, while the opposite surface uses a monolithic structure as the cathode. The size of the pixel anode can be adjusted appropriately based on experimental performance requirements and application scenarios. It is used to set the pixel detector's bias voltage and extract signals. Metallic gold is used as the material for the pixel anode and cathode to ensure signal readout and pixel detector packaging.

[0038] Optionally, a pixel detector includes multiple regular quadrilateral pixel anodes arranged in a matrix to form a larger regular quadrilateral. These pixel anodes work together, and when the pixel anodes interact with gamma rays, the location of the gamma photon generation can be preliminarily determined based on the position of the target pixel anode. However, this location is not completely accurate and needs to be corrected using a position correction value to accurately determine the location of the gamma photon generation.

[0039] Optionally, the target pixel anode is the pixel anode that receives the largest induction signal among multiple pixel anodes. Specifically, after the pixel-type detector interacts with the gamma rays, electron-hole pairs are generated, and the electron-hole pairs generate induction signals on multiple pixel anodes. The induction signal generated by the target pixel anode is the largest, and it is the pixel anode that mainly senses gamma rays in the pixel-type detector. The pixel anodes around the target pixel anode will also generate induction signals to varying degrees, but the induction signals are weaker. The target pixel anode is determined based on the size of the induction signals generated in the multiple pixel anodes. At the same time, the position of the target pixel anode can preliminarily determine the position of the gamma photon, that is, the rough position of the gamma photon, and then make corrections based on the rough position to obtain the final target position.

[0040] In some preferred embodiments, before determining the target pixel anode interacting with the gamma ray in the pixel-type detector, the position of the target pixel anode, and the side length of the target pixel anode, the method further includes: constructing an (x, y) coordinate system; placing the pixel-type detector and the gamma ray in the coordinate system, wherein the pixel-type detector includes a plurality of pixel anodes arranged in a regular quadrilateral.

[0041] Optionally, by constructing an (x, y) coordinate system and selecting a two-dimensional positioning method, the x-coordinate position and y-coordinate position of the gamma photon are obtained, and the position is expressed in the form of coordinates. The position of the gamma photon can be observed intuitively, which is convenient for subsequent verification and subsequent experiments.

[0042] Alternatively, the position of the gamma photon can be represented in the form of a coordinate system. When adjusting the corrected position, the x-coordinate position and / or the y-coordinate position can be adjusted to achieve a more accurate position of the gamma photon. Furthermore, the position information can be digitized and stored in a digital form for use in subsequent experiments.

[0043] Step S104, obtaining the arrangement number of the target pixel anode, wherein the arrangement number includes a row number and a column number;

[0044] Optionally, the position information of the interaction of gamma rays in the pixel-type detector can be roughly obtained by deriving the arrangement number of the target pixel anode, but there is some uncertainty, that is, there may be deviations. Specifically, the uncertainty is equivalent to the width of the side length of the pixel anode. The roughly obtained position information can be adjusted by the side length of the pixel anode to achieve the accurate target position of the gamma photon.

[0045] Optionally, multiple pixel anodes are arranged in a matrix to form a regular quadrilateral. Based on the target pixel anode being in the i-th row and j-th column in the matrix arrangement and the side length of the pixel anode, the first distance between the target pixel anode and the edge of the pixel detector can be determined. At the same time, based on the side length of the pixel anode and the first distance, the roughly obtained position can be corrected to obtain the precise target position.

[0046] Step S106, determining the amplitude values of the sensing signals corresponding to the plurality of first pixel anodes, wherein the plurality of first pixel anodes are used to indicate pixel anodes adjacent to the target pixel anode, and the plurality of first pixel anodes include a second pixel anode having an arrangement number smaller than the target pixel anode and a third pixel anode having an arrangement number larger than the target pixel anode;

[0047] Optionally, by eliciting the amplitude of the sensing signal on the first pixel anode adjacent to the target pixel anode or the slight fluctuation and difference of the signal, assuming that the amplitude value of the sensing signal of the third pixel anode is larger than the amplitude value of the sensing signal of the second pixel anode, it means that the signal of the gamma photon is offset toward the third pixel anode, and the position of the gamma photon is determined to be on the right side of the target pixel anode (the arrangement number increases gradually from left to right). At the same time, based on the size of the sensing signal amplitude value, the distance between the gamma photon position and the target pixel anode can be determined, thereby determining the position correction value based on the position of the target pixel anode.

[0048] Optionally, the fluctuation of the influence of the gamma photon signal on the first pixel anode adjacent to the target pixel anode in multiple directions is determined, so as to determine the offset direction and offset distance of the gamma photon position to the adjacent position. The two-dimensional positioning method - pixel difference coefficient method is obtained by analysis and summary, which can effectively improve the positioning accuracy in the two-dimensional direction.

[0049] In some preferred embodiments, determining the sensing signal amplitude values corresponding to the plurality of first pixel anodes includes: the plurality of first pixel anodes includes eight, specifically including two pixel anodes in the same row and adjacent columns as the target pixel anode, also including two pixel anodes in the same column and adjacent rows as the target pixel anode, and also including four pixel anodes in adjacent columns and adjacent rows as the target pixel anode; determining the sensing signal amplitude values corresponding to each of the eight first pixel anodes.

[0050] Optionally, the target pixel anodes are arranged in a matrix, with row numbers and column numbers, such as Figure 3 As shown, Figure 3 This is a schematic diagram of the positions of pixel anodes of a pixel-type detector in a method for gamma photon localization of a pixel-type cadmium zinc telluride detector in Example 1 of the present invention. When the target pixel anode is in the middle position, eight first pixel anodes are located around the target pixel anode, including two pixel anodes in the same row but different columns as the target pixel anode (first pixel anodes at the left and right positions of the target pixel anode), two pixel anodes in the same column but different rows as the target pixel anode (first pixel anodes at the upper and lower positions of the target pixel anode), and four pixel anodes in adjacent rows and columns to the target pixel anode (four first pixel anodes at the corners).

[0051] Among them, above the target pixel anode is the second pixel anode whose row number is smaller than the target pixel anode row number, and below is the third pixel anode whose row number is larger than the target pixel anode row number; to the left of the target pixel anode is the second pixel anode whose column number is smaller than the target pixel anode column number, and to the right is the third pixel anode whose column number is larger than the target pixel anode column number.

[0052] Step S108, determining a position correction value based on a difference between the amplitude value of the sensing signal corresponding to the third pixel anode and the amplitude value of the sensing signal corresponding to the second pixel anode, and the side length of the target pixel anode;

[0053] Optionally, the pixel difference coefficient method is selected, and the difference in the amplitude value of the induced signal of different signals on the pixel anode in the experimental test is used as the weight coefficient for position calculation, and a correction item is set. The position correction value is determined based on the weight coefficient, so that the x-coordinate position and the y-coordinate position are corrected in the two-dimensional coordinate system through a two-dimensional positioning method to obtain the accurate target position.

[0054] In some preferred embodiments, when the interaction process between the pixel-type detector and the gamma ray is placed in a coordinate system including an x-coordinate position and a y-coordinate position, a position correction value is determined based on a difference between an amplitude value of a sensing signal corresponding to the third pixel anode and an amplitude value of a sensing signal corresponding to the second pixel anode, as well as a side length of the target pixel anode, including: determining a first difference between an amplitude value of a sensing signal corresponding to a third pixel anode having a row number greater than the target pixel anode and an amplitude value of a sensing signal corresponding to a second pixel anode having a row number less than the target pixel anode among a plurality of first pixel anodes; determining a first difference between an amplitude value of a sensing signal corresponding to a third pixel anode having a row number greater than the target pixel anode and an amplitude value of a sensing signal corresponding to a second pixel anode having a row number less than the target pixel anode among a plurality of first pixel anodes. a first sum of the amplitude values of the sensing signals; determining a first weight coefficient for the x-coordinate position correction based on a first ratio of the first difference and the first sum; determining a second difference between the amplitude value of the sensing signal corresponding to the third pixel anode whose column number is greater than the target pixel anode among the multiple first pixel anodes and the amplitude value of the sensing signal corresponding to the second pixel anode whose column number is less than the target pixel anode; determining a second sum of the amplitude value of the sensing signal corresponding to the third pixel anode whose column number is greater than the target pixel anode among the multiple first pixel anodes and the amplitude value of the sensing signal corresponding to the second pixel anode whose column number is less than the target pixel anode; determining a second weight coefficient for the y-coordinate position correction based on a second ratio of the second difference and the second sum; and determining a position correction value based on the first weight coefficient, the second weight coefficient, and the side length of the target pixel anode.

[0055] Optionally, since the target position of the gamma photon has an x-coordinate position and a y-coordinate position, the x-coordinate position needs to be corrected, and the y-coordinate position also needs to be corrected. Therefore, it is necessary to obtain a first weight coefficient for the x-coordinate position correction to obtain the x-coordinate correction value; and obtain a second weight coefficient for the y-coordinate position correction to obtain the y-coordinate correction value.

[0056] Optionally, the first weight coefficient for the x-coordinate position correction is determined by the second pixel anode above the target pixel anode and the third pixel anode below the target pixel anode, and is specifically calculated as follows:

[0057]

[0058] Among them, α is the first weight coefficient; A i,j is the amplitude of the sensing signal of the pixel anode at the i-th row and j-th column;

[0059] A i+1,j-1 +A i+1,j +A i+1,j+1 The amplitude value of the sensing signal of the third pixel anode whose row number is greater than the row number of the target pixel anode;

[0060] A i-1,j-1 +A i-1,j +A i-1,j+1 The amplitude value of the sensing signal of the second pixel anode whose row number is smaller than the row number of the target pixel anode;

[0061] (A i+1,j-1 +A i+1,j +A i+1,j+1 )-(A i-1,j-1 +A i-1,j +A i-1,j+1 ) is the first difference;

[0062] (A i+1,j-1 +A i+1,j +A i+1,j+1 )+(A i-1,j-1 +A i-1,j +A i-1,j+1 ) is the first sum value.

[0063] Optionally, the second weight coefficient for y-coordinate position correction is determined by the second pixel anode on the left side and the third pixel anode on the right side of the target pixel anode, and is specifically calculated as follows:

[0064]

[0065] Among them, β is the second weight coefficient; A i,j is the amplitude of the sensing signal of the pixel anode at row i and column j, which is proportional to the charge of the drift charge cloud in the gamma photon;

[0066] A i-1,j+1 +A i,j+1 +A i+1,j+1 is the amplitude value of the sensing signal of the third pixel anode whose column number is greater than the column number of the target pixel anode;

[0067] A i-1,j-1 +A i,j-1 +A i+1,j-1 The amplitude value of the sensing signal of the second pixel anode whose column number is smaller than the column number of the target pixel anode;

[0068] (Ai-1,j+1 +A i,j+1 +A i+1,j+1 )-(A i-1,j-1 +A i,j-1 +A i+1,j-1 ) is the second difference;

[0069] (A i-1,j+1 +A i,j+1 +A i+1,j+1 )+(A i-1,j-1 +A i,j-1 +A i+1,j-1 ) is the second sum.

[0070] Optionally, when the target pixel anode is at the edge of the pixel detector, that is, the row number or column number is 1, or the row number or column number is the maximum value of the arrangement number in the pixel detector, the formula (A i+1,j-1 +A i+1,j +A i+1,j+1 ) or (A i-1,j-1 +A i-1,j +A i-1,j+1 ) or (A i-1,j+1 +A i,j+1 +A i+1,j+1 ) or (A i-1,j-1 +

[0071] A i,j-1 +A i+1,j-1 ) is 0, at this time, the position is calculated by weighting the signals on two adjacent anodes, and A i,j The value of (A i+1,j-1 +A i+1,j +A i+1,j+1 ) or (A i-1,j-1 +A i-1,j +A i-1,j+1 ) or (A i-1,j+1 +A i,j+1 +

[0072] A i+1,j+1 ) or (A i-1,j-1 +A i,j-1 +A i+1,j-1 ).

[0073] Optionally, based on the determined first weight coefficient and the second weight coefficient, the x-coordinate position and the y-coordinate position can be corrected respectively, thereby effectively achieving the accuracy of the target position correction.

[0074] In some preferred embodiments, when the position correction includes correcting the x-coordinate position and correcting the y-coordinate position, and the position correction value includes the x-coordinate correction value and the y-coordinate correction value, the position correction value is determined based on the first weight coefficient, the second weight coefficient and the side length of the target pixel anode, including: determining the first length of the center position of the target pixel anode from the edge line of the target pixel anode based on half of the side length of the target pixel anode; determining the x-coordinate correction value based on the product of the first weight coefficient and the first length; and determining the y-coordinate correction value based on the product of the second weight coefficient and the first length.

[0075] Optionally, the first weight coefficient and the second weight coefficient are both determined based on the amplitude values of the sensing signals on both sides of the anode of the target pixel. When the first difference and the second difference are positive, the correction position needs to be shifted downward or to the right. When the first difference and the second difference are negative, the correction position needs to be shifted upward or to the left. The weight coefficient can not only adjust the direction of the offset, but also adjust the size of the offset distance. When the weight coefficient is larger, the position correction value is larger, so the adjusted offset distance is larger, which also means that the target position is greatly different from the roughly measured position at this time.

[0076] Optionally, the first weight coefficient and the second weight coefficient are used as distance adjustment coefficients, and the overall adjustment range is determined by the side length of the target pixel anode. The unit length of the adjustment distance is determined based on half of the side length of the target pixel anode, that is, the length from the center position of the target pixel anode to the edge line of the target pixel anode (the first length) is used as the unit length of the adjustment distance. The length of the adjustment distance, that is, the position correction value, is determined by multiplying the unit length by the weight coefficient.

[0077] It should be noted that the pixel anode is a regular quadrilateral structure, which includes four side lines. The side lines are the frame lines in the front view of the pixel anode, and the distance from the center position of the target pixel anode to any side line is the same.

[0078] Optionally, the smaller the unit length, the higher the accuracy of the position adjustment, and the higher the accuracy of the target position obtained. In addition, the unit length is associated with the side length of the target pixel anode. When the side length of the target pixel anode is larger, the sensing signal of the target pixel anode is stronger, resulting in a longer distance of gamma photon offset, so the position correction value that needs to be adjusted is larger. The side length of the target pixel anode is directly proportional to the position correction value, so the unit length can be associated with the side length of the target pixel anode to make the target position acquisition more accurate.

[0079] Optionally, the specific expression of the x-coordinate correction value is as follows:

[0080]

[0081] Where Δx is the x-coordinate correction value; D A is the side length of the target pixel anode.

[0082] Optionally, the specific expression of the y-coordinate correction value is as follows:

[0083]

[0084] Where Δy is the x-coordinate correction value; D A is the side length of the target pixel anode.

[0085] In step S110 , a target position of a gamma photon is determined based on the position of the target pixel anode and the position correction value, wherein the gamma photon is generated by the interaction between the pixel-type detector and the gamma ray.

[0086] Optionally, the position of the target pixel anode is the position of the main sensing electrode, that is, the rough position of the gamma photon. Based on the position of the target pixel anode, the rough position of the gamma photon is corrected by the position correction value to obtain the target position of the gamma photon, effectively making the acquired target position more accurate.

[0087] In some preferred embodiments, the target position of the gamma photon is determined based on the position of the target pixel anode and the position correction value, including: determining a first distance from the edge of the second pixel anode to the edge of the pixel-type detector based on the position of the target pixel anode, and a second distance from the center position of the target pixel anode to the edge of the second pixel anode, wherein the second pixel anode is the pixel anode with row number 1; and determining the target position of the gamma photon based on the first distance, the second distance and the position correction value.

[0088] Optionally, the second pixel anode is the pixel anode with row number 1, that is, the pixel anode in the leftmost column, and the first distance is the shortest distance from the edge of the second pixel anode to the edge of the pixel-type detector, that is, the distance from the leftmost edge of the second pixel anode to the left edge of the detector, and it is a vertical distance, which is the above-mentioned first distance.

[0089] Optional, such as Figure 4 As shown, Figure 4 This is a schematic diagram of the position of the target pixel anode in a pixel-type cadmium zinc telluride detector gamma photon positioning method in Example 1 of the present invention. Based on the position of the target pixel anode, that is, based on the arrangement number of the target pixel anode, assuming that the arrangement number of the target pixel anode is the second row and second column, the center position of the target pixel anode and the edge of the pixel-type detector include: the second distance from the center position of the target pixel anode to the edge line of the second pixel anode with row number 1 ( Figure 4 Middle B A ), and the first distance from the second pixel anode edge to the edge of the pixel detector ( Figure 4 China E A distance).

[0090] Optionally, based on the sum of the first distance and the second distance, the distance between the center position of the target pixel anode and the edge position of the pixel detector can be determined, that is, the coordinate position of the target pixel anode can be determined, and then the rough position of the gamma photon can be determined based on the coordinate position of the target pixel anode, and then the target position of the gamma photon can be determined based on the position correction value.

[0091] In some preferred embodiments, determining the second distance from the center position of the target pixel anode to the edge line of the second pixel anode includes: determining a first length from the center position of the target pixel anode to the edge line of the target pixel anode based on half of the side length of the target pixel anode; determining a first number of pixel anodes between the target pixel anode and the second pixel anode; determining a second length of the sum of the side lengths of multiple pixel anodes from the center position of the target pixel anode to the second pixel anode based on the first number and the first length; determining the gap size between two adjacent pixel anodes; determining a third length of the gap from the center position of the target pixel anode to the second pixel anode based on the gap size and the first number; and determining a second distance based on the second length and the third length.

[0092] Optionally, the first number is the number of pixel anodes between the target pixel anode and the second pixel anode, that is, the row number of the target pixel anode. The second length is the sum of the side lengths of the first number of pixel anodes minus half the side length of the pixel anode.

[0093] Optionally, the second distance includes: the gap size between two adjacent pixel anodes ( Figure 4 Medium G A ), and the distance of 2i-1 pixel anode side length ( Wherein, taking the target pixel anode as the second row and second column as an example, the first length is The second length is three The third length is (i-1)×G A , that is, a G A .

[0094] Specifically, the second distance is calculated as follows:

[0095]

[0096] Wherein, L2 is the second distance; i is the row number of the target pixel anode; D A is the side length of the pixel anode; G A is the gap size between two adjacent pixel anodes.

[0097] In some preferred embodiments, when the target position includes an x-coordinate position and a y-coordinate position, and the position correction value includes an x-coordinate correction value and a y-coordinate correction value, determining the target position of the gamma photon based on the first distance, the second distance, and the position correction value includes: determining the x-coordinate position of the gamma photon based on the first distance, the second distance, and the x-coordinate correction value; determining the y-coordinate position of the gamma photon based on the first distance, the second distance, and the y-coordinate correction value.

[0098] Optionally, the x-coordinate position of a gamma photon is calculated as follows:

[0099]

[0100] Where x is the x-coordinate position of the gamma photon; E A D is the distance from the edge of the second pixel anode to the edge of the pixel detector; A is the side length of the pixel anode; G A is the gap size between two adjacent pixel anodes; Δx is the x-coordinate correction value.

[0101] Optionally, the y-coordinate position of the gamma photon is calculated as follows:

[0102]

[0103] Where y is the y coordinate position of the gamma photon; E A D is the distance from the edge of the second pixel anode to the edge of the pixel detector; A is the side length of the pixel anode; G A is the gap size between two adjacent pixel anodes; Δy is the y coordinate correction value.

[0104] Through the above steps S102 to S110, the purpose of determining the deviation correction value by taking into account the side length of the pixel anode and the amplitude value of the sensing signal of the adjacent pixel anode is achieved, thereby achieving the technical effect of more accurate determination of the deviation correction value and more accurate acquisition of the target position, and further solving the technical problem of inaccurate target position acquisition due to the deviation correction being a fixed value or only considering the deviation in a predetermined direction.

[0105] Example 2

[0106] Based on the above embodiment and optional embodiment, the present invention also proposes an optional implementation method. In this embodiment, a Na-22 radioactive source is used as an experimental object. The radioactive source emits β +The radiation annihilates electrons in the object, emitting a pair of 511keV gamma rays. Taking the location information of the interaction of 511keV gamma rays as an example, the average diameter of the charge cloud induced in a pixel-type CdZnTe detector is approximately 200 microns, which can be used to locate radiation with energy of 100keV.

[0107] It should be noted that for pixel-type CdZnTe detectors, the calculation formulas in the x and y directions are exactly the same, where a coordinate system (x, y) is constructed, and the starting point (0, 0) is the lower left corner of the pixel-type detector.

[0108] The method includes: correcting the target position of the gamma photon by using a position correction value.

[0109] The formula for calculating the x-coordinate position of a gamma photon is as follows:

[0110]

[0111] Among them, D A is the side length of the pixel anode, i is the row number of the target pixel anode, and the target pixel anode in the i-th row and j-th column is the main collecting anode. A G is the distance from the edge of the second pixel anode to the edge of the pixel detector, A is the gap size between two adjacent pixel anodes, and the unit is mm. Δx takes the center of the sensing electrode (target pixel anode) as the reference point, and the difference in the signal amplitude values on the adjacent upper and lower pixel anodes is used as the first weight coefficient, and the unit is mm, that is,

[0112]

[0113] Among them, A i,j is the amplitude of the sensing signal of the pixel anode in the i-th row and the j-th column, which is proportional to the charge amount of the drift charge cloud.

[0114] When the anode at the edge is the most important sensing electrode (target pixel anode), the formula (A i+1,j-1 +A i+1,j +A i+1,j+1 ) or (A i-1,j-1 +A i-1,j +A i-1,j+1 ) is 0, at this time, the position calculation is performed using the signal weights on the two adjacent pixel anodes, and A i,j The value of (A i+1,j-1 +A i+1,j +A i+1,j+1 ) or (A i-1,j-1 +A i-1,j +A i-1,j+1 ).

[0115] The formula for calculating the y-coordinate position of a gamma photon is as follows:

[0116]

[0117] Δy takes the center of the sensing electrode (target pixel anode) as the reference point, and the difference in the signal amplitude values on the adjacent left and right pixel anodes is used as the second weight coefficient, in mm, that is,

[0118]

[0119] Among them, A i,j is the sensing signal amplitude value of the pixel anode in the i-th row and the j-th column. When the anode at the edge is the most important sensing electrode (target pixel anode), (A i-1,j+1 +A i,j+1 +A i+1,j+1 ) or (A i-1,j-1 +A i,j-1 +A i+1,j-1 ) is 0, at this time, the position is calculated by weighting the signals on two adjacent anodes, and A i,j Assign the value of A i+1,j-1 +A i+1,j +A i+1,j+1 ) or (A i-1,j-1 +A i-1,j +A i-1,j+1 ).

[0120] The use of software technology to promote the acquisition of two-dimensional position information of gamma rays in position-sensitive cadmium zinc telluride can improve the position resolution method and reduce the cost of improving the two-dimensional position resolution, such as the need for high-level processing technology and high industrial technology to manufacture detector modules with smaller electrode sizes.

[0121] Example 3

[0122] This embodiment also provides a pixel-type cadmium zinc telluride detector gamma photon positioning device, which is used to implement the above-mentioned embodiments and preferred embodiments. Details already described will not be repeated here. As used below, the terms "module" and "device" may refer to a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation using hardware, or a combination of software and hardware, is also possible and contemplated.

[0123] According to an embodiment of the present invention, a device embodiment for implementing the above-mentioned pixel-type cadmium zinc telluride detector gamma photon positioning method is provided. Figure 5 : is a schematic structural diagram of a pixel-type cadmium zinc telluride detector gamma photon positioning device in Example 3 of the present invention, such as Figure 5As shown, the above device includes: a data determination module 301, a number acquisition module 302, an amplitude value determination module 303, a correction module 304 and a position acquisition module 305, wherein:

[0124] The data determination module 301 determines a target pixel anode interacting with the gamma ray in the pixel-type detector, a position of the target pixel anode, and a side length of the target pixel anode;

[0125] The number acquisition module 302 is connected to the data determination module 301 and acquires the arrangement number of the anode of the target pixel;

[0126] an amplitude value determining module 303, connected to the number obtaining module 302, and determining the amplitude values of the sensing signals corresponding to the plurality of first pixel anodes, wherein the plurality of first pixel anodes are used to indicate pixel anodes adjacent to the target pixel anode, and the plurality of first pixel anodes include a second pixel anode having an arrangement number smaller than the target pixel anode and a third pixel anode having an arrangement number larger than the target pixel anode;

[0127] The correction module 304 is connected to the amplitude value determination module 303 and determines a position correction value based on the difference between the amplitude value of the sensing signal corresponding to the third pixel anode and the amplitude value of the sensing signal corresponding to the second pixel anode, and the side length of the target pixel anode;

[0128] The position acquisition module 305 is connected to the correction module 304 and determines the target position of the gamma photon based on the position of the target pixel anode and the position correction value, wherein the gamma photon is generated by the interaction between the pixel-type detector and the gamma ray.

[0129] It should be noted that the above modules can be implemented by software or hardware. For example, for the latter, it can be implemented in the following ways: the above modules can be located in the same processor; or the above modules can be located in different processors in any combination.

[0130] It should be noted that the data determination module 301, number acquisition module 302, amplitude value determination module 303, correction module 304, and position acquisition module 305 described above correspond to steps S102 to S110 in the embodiment. The examples and application scenarios implemented by these modules and corresponding steps are the same, but are not limited to the contents disclosed in the above embodiment. It should be noted that the above modules, as part of the device, can be run on a computer terminal.

[0131] It should be noted that the optional or preferred implementation of this embodiment can be found in the relevant description in the embodiment, which will not be repeated here.

[0132] The above-mentioned pixel-type cadmium zinc telluride detector gamma photon positioning device may further include a processor and a memory. The above-mentioned data determination module 301, number acquisition module 302, amplitude value determination module 303, correction module 304 and position acquisition module 305 are all stored in the memory as program modules, and the processor executes the above-mentioned program modules stored in the memory to realize corresponding functions.

[0133] The processor includes a core, which retrieves corresponding program modules from memory. There can be one or more cores. Memory may include non-permanent memory in a computer-readable medium, random access memory (RAM), and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory includes at least one memory chip.

[0134] According to an embodiment of the present application, an embodiment of a non-volatile storage medium is also provided. Optionally, in this embodiment, the non-volatile storage medium includes a stored program, wherein, when the program is executed, the device containing the non-volatile storage medium is controlled to execute any of the aforementioned pixel-type cadmium zinc telluride detector gamma photon localization methods.

[0135] Optionally, in this embodiment, the non-volatile storage medium may be located in any computer terminal in a computer terminal group in a computer network, or in any mobile terminal in a mobile terminal group, and the non-volatile storage medium includes a stored program.

[0136] Optionally, when the program is running, the device where the non-volatile storage medium is located is controlled to perform the following functions: determine the target pixel anode that interacts with the gamma ray in the pixel-type detector, the position of the target pixel anode, and the side length of the target pixel anode; obtain the arrangement number of the target pixel anode; determine the sensing signal amplitude values corresponding to multiple first pixel anodes, wherein the multiple first pixel anodes are used to indicate the pixel anodes adjacent to the target pixel anode, and the multiple first pixel anodes include a second pixel anode with an arrangement number smaller than the target pixel anode and a third pixel anode with an arrangement number larger than the target pixel anode; determine a position correction value based on the difference between the sensing signal amplitude value corresponding to the third pixel anode and the sensing signal amplitude value corresponding to the second pixel anode, and the side length of the target pixel anode; determine the target position of the gamma photon based on the position of the target pixel anode and the position correction value, wherein the gamma photon is generated by the interaction between the pixel-type detector and the gamma ray.

[0137] According to an embodiment of the present application, an embodiment of a processor is further provided. Optionally, in this embodiment, the processor is configured to run a program, wherein when the program is run, any of the above-mentioned pixel-type CdZnTe detector gamma photon localization methods is executed.

[0138] According to an embodiment of the present application, an embodiment of a computer program product is also provided. Optionally, in this embodiment, the computer program product includes a computer program that, when executed by a processor, implements any of the steps of the aforementioned pixel-type CdZnTe detector gamma photon localization method.

[0139] Optionally, the above-mentioned computer program product, when executed on a data processing device, is suitable for executing a program initialized with the following method steps: determining a target pixel anode interacting with gamma rays in a pixel-type detector, the position of the target pixel anode, and the side length of the target pixel anode; obtaining the arrangement number of the target pixel anode; determining the sensing signal amplitude values corresponding to multiple first pixel anodes, wherein the multiple first pixel anodes are used to indicate pixel anodes adjacent to the target pixel anode, and the multiple first pixel anodes include a second pixel anode with an arrangement number smaller than the target pixel anode and a third pixel anode with an arrangement number larger than the target pixel anode; determining a position correction value based on the difference between the sensing signal amplitude value corresponding to the third pixel anode and the sensing signal amplitude value corresponding to the second pixel anode, and the side length of the target pixel anode; determining the target position of the gamma photon based on the position of the target pixel anode and the position correction value, wherein the gamma photon is generated by the interaction between the pixel-type detector and the gamma rays.

[0140] An embodiment of the present invention provides an electronic device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, the following steps are implemented: determining a target pixel anode interacting with gamma rays in a pixel-type detector, a position of the target pixel anode, and a side length of the target pixel anode; obtaining an arrangement number of the target pixel anode; determining sensing signal amplitude values corresponding to a plurality of first pixel anodes, wherein the plurality of first pixel anodes are used to indicate pixel anodes adjacent to the target pixel anode, and the plurality of first pixel anodes include a second pixel anode having an arrangement number smaller than the target pixel anode and a third pixel anode having an arrangement number larger than the target pixel anode; determining a position correction value based on a difference between a sensing signal amplitude value corresponding to the third pixel anode and a sensing signal amplitude value corresponding to the second pixel anode, and the side length of the target pixel anode; and determining a target position of a gamma photon based on the position of the target pixel anode and the position correction value, wherein the gamma photon is generated by the interaction between the pixel-type detector and the gamma rays.

[0141] The above sequence of the embodiments of the present invention is for description only and does not represent the superiority or inferiority of the embodiments.

[0142] In the above embodiments of the present invention, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0143] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of the above modules can be a logical function division. In actual implementation, there may be other division methods, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, modules or indirect coupling or communication connection of modules, which can be electrical or other forms.

[0144] The modules described above as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed across multiple modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0145] In addition, the functional modules in various embodiments of the present invention may be integrated into a single processing module, or each module may exist physically separately, or two or more modules may be integrated into a single module. The aforementioned integrated modules may be implemented in the form of hardware or software functional modules.

[0146] If the above-mentioned integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable non-volatile storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a non-volatile storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to execute all or part of the steps of the various embodiments of the present invention. The aforementioned non-volatile storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, and other media that can store program codes.

[0147] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A pixel-type cadmium zinc telluride detector gamma photon positioning method, characterized in that: include: Determining a target pixel anode that interacts with the gamma ray in the pixel-type detector, a position of the target pixel anode, and a side length of the target pixel anode, wherein the target pixel anode is used to indicate a pixel anode that is primarily sensitive to the gamma ray in the pixel-type detector; Obtaining an arrangement number of the target pixel anode, wherein the arrangement number includes a row number and a column number; Determining the amplitude values of the sensing signals corresponding to a plurality of first pixel anodes, wherein the plurality of first pixel anodes are used to indicate pixel anodes adjacent to the target pixel anode, and the plurality of first pixel anodes include a second pixel anode having an arrangement number smaller than that of the target pixel anode and a third pixel anode having an arrangement number larger than that of the target pixel anode; determining a position correction value based on a difference between an amplitude value of the sensing signal corresponding to the third pixel anode and an amplitude value of the sensing signal corresponding to the second pixel anode, and a side length of the target pixel anode; A target position of a gamma photon is determined based on the position of the target pixel anode and the position correction value, wherein the gamma photon is generated by the interaction between the pixel-type detector and the gamma ray.

2. The method for positioning gamma photons of a pixel-type CdZnTe detector according to claim 1, characterized in that: Before determining the target pixel anode interacting with the gamma ray in the pixel-type detector, the position of the target pixel anode, and the side length of the target pixel anode, the method further includes: Construct a (x, y) coordinate system; The pixel-type detector and the gamma ray are placed in the coordinate system, wherein the pixel-type detector includes a plurality of pixel anodes arranged in a regular quadrilateral.

3. The method for positioning gamma photons of a pixel-type CdZnTe detector according to claim 1, wherein: The determining of the amplitude values of the sensing signals corresponding to the plurality of first pixel anodes includes: The plurality of first pixel anodes include eight, specifically including two pixel anodes in the same row and adjacent columns as the target pixel anode, two pixel anodes in the same column and adjacent rows as the target pixel anode, and four pixel anodes in adjacent columns and adjacent rows as the target pixel anode; Determine the amplitude values of the sensing signals corresponding to the eight first pixel anodes respectively.

4. The method for positioning gamma photons of a pixel-type CdZnTe detector according to claim 2, wherein: In a case where the interaction process between the pixel-type detector and the gamma ray is placed in the coordinate system, including an x-coordinate position and a y-coordinate position, determining the position correction value based on a difference between an amplitude value of a sensing signal corresponding to the third pixel anode and an amplitude value of a sensing signal corresponding to the second pixel anode, and a side length of the target pixel anode, includes: determining a first difference between a sensing signal amplitude value corresponding to a third pixel anode having a row number greater than the target pixel anode among the plurality of first pixel anodes and a sensing signal amplitude value corresponding to a second pixel anode having a row number less than the target pixel anode; determining a first sum of a sensing signal amplitude value corresponding to a third pixel anode having a row number greater than the target pixel anode and a sensing signal amplitude value corresponding to a second pixel anode having a row number less than the target pixel anode among the plurality of first pixel anodes; determining a first weight coefficient for x-coordinate position correction based on a first ratio of the first difference to the first sum; determining a second difference between a sensing signal amplitude value corresponding to a third pixel anode having a column number greater than the target pixel anode among the plurality of first pixel anodes and a sensing signal amplitude value corresponding to a second pixel anode having a column number less than the target pixel anode; determining a second sum of a sensing signal amplitude value corresponding to a third pixel anode having a column number greater than the target pixel anode among the plurality of first pixel anodes and a sensing signal amplitude value corresponding to a second pixel anode having a column number less than the target pixel anode; determining a second weight coefficient for y-coordinate position correction based on a second ratio of the second difference to the second sum; The position correction value is determined based on the first weight coefficient, the second weight coefficient, and the side length of the anode of the target pixel.

5. The method for positioning gamma photons of a pixel-type CdZnTe detector according to claim 4, characterized in that: In a case where the position correction includes correcting an x-coordinate position and correcting a y-coordinate position, and the position correction value includes an x-coordinate correction value and a y-coordinate correction value, determining the position correction value based on the first weight coefficient, the second weight coefficient, and the side length of the target pixel anode includes: Determine a first distance between the center position of the target pixel anode and the edge line of the target pixel anode based on half of the side length of the target pixel anode; determining the x-coordinate correction value based on the product of the first weight coefficient and the first length; The y-coordinate correction value is determined based on a product of the second weight coefficient and the first length.

6. The method for positioning gamma photons of a pixel-type CdZnTe detector according to claim 1, characterized in that: The determining the target position of the gamma photon based on the position of the target pixel anode and the position correction value includes: determining, based on the position of the target pixel anode, a first distance from an edge of a second pixel anode to an edge of the pixel-type detector, and a second distance from a center position of the target pixel anode to an edge of the second pixel anode, wherein the second pixel anode is the pixel anode with row number 1; A target position of the gamma photon is determined based on the first distance, the second distance, and the position correction value.

7. The method for positioning gamma photons of a pixel-type CdZnTe detector according to claim 6, characterized in that: Determining a second distance from the center position of the target pixel anode to the edge line of the second pixel anode includes: Determine a first distance between the center position of the target pixel anode and the edge line of the target pixel anode based on half of the side length of the target pixel anode; determining a first number of pixel anodes between the target pixel anode and the second pixel anode; Determine a second length, based on the first number and the first length, of the sum of side lengths of a plurality of pixel anodes from the center of the target pixel anode to the second pixel anode; Determine the gap size between two adjacent pixel anodes; determining a third length of a gap from a center position of the target pixel anode to the second pixel anode based on the gap size and the first number; The second distance is determined based on the second length and the third length.

8. The method for positioning gamma photons of a pixel-type CdZnTe detector according to claim 6, characterized in that: In a case where the target position includes an x-coordinate position and a y-coordinate position, and the position correction value includes the x-coordinate correction value and the y-coordinate correction value, determining the target position of the gamma photon based on the first distance, the second distance, and the position correction value includes: determining an x-coordinate position of the gamma photon based on the first distance, the second distance, and the x-coordinate correction value; The y-coordinate position of the gamma photon is determined based on the first distance, the second distance, and the y-coordinate correction value.

9. A pixel-type cadmium zinc telluride detector gamma photon positioning device, characterized in that: include: a data determination module for determining a target pixel anode interacting with the gamma ray in the pixel-type detector, a position of the target pixel anode, and a side length of the target pixel anode; A number acquisition module, which acquires the arrangement number of the anode of the target pixel; an amplitude value determining module, configured to determine amplitude values of sensing signals corresponding to a plurality of first pixel anodes, wherein the plurality of first pixel anodes are used to indicate pixel anodes adjacent to the target pixel anode, and the plurality of first pixel anodes include a second pixel anode having an arrangement number smaller than that of the target pixel anode and a third pixel anode having an arrangement number larger than that of the target pixel anode; a correction module, which determines a position correction value based on a difference between an amplitude value of the sensing signal corresponding to the third pixel anode and an amplitude value of the sensing signal corresponding to the second pixel anode, and a side length of the target pixel anode; A position acquisition module determines a target position of a gamma photon based on the position of the target pixel anode and the position correction value, wherein the gamma photon is generated by the interaction between the pixel-type detector and the gamma ray.

10. A non-volatile storage medium, characterized in that: The non-volatile storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor and executed by a pixel-type cadmium zinc telluride detector gamma photon positioning method according to any one of claims 1 to 8.

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