Method and device for correcting signal crosstalk between layers of a multi-layer detector, and electronic device

Abstract

This application relates to the field of radiation imaging technology, and particularly to a method, apparatus, and electronic device for interlayer crosstalk correction in a multilayer detector. The method includes: acquiring projection signals of each layer from the multilayer detector under target scanning parameters; determining interlayer crosstalk correction convolution kernels for different layers in the multilayer detector based on the structural parameters of the multilayer detector and the target scanning parameters, wherein the interlayer crosstalk correction convolution kernels represent a first mapping relationship between the interlayer crosstalk signal and the projection signal; estimating the interlayer crosstalk signal in the multilayer detector based on the projection signals of each layer and the interlayer crosstalk correction convolution kernels; and correcting the projection signals of each layer based on the interlayer crosstalk signal, thereby achieving interlayer crosstalk signal correction. This solves the problems of interlayer signal crosstalk caused by interlayer radiation scattering within the multilayer detector and the resulting artifacts in the energy spectrum reconstruction image in related technologies.

Description

Technical Field

[0001] This application relates to the field of radiation imaging technology, and in particular to a method, apparatus and electronic device for correcting crosstalk between layers of a multilayer detector. Background Technology

[0002] Computed tomography (CT) technology has been widely used in industrial and medical imaging, playing a vital role in non-destructive testing and medical diagnosis. Among related technologies, cone-beam computed tomography (CBCT) based on multi-slice flat-panel detectors can improve image quantification performance and enhance imaging quality. However, inter-slice X-ray scattering occurring between different layers at the detector end can cause signal crosstalk in the projected signals of each layer measured by the detector, thus affecting the accuracy of material decomposition, causing artifacts in the reconstructed image, and reducing the quantitative performance of spectral imaging. Summary of the Invention

[0003] This application provides a method, apparatus, and electronic device for correcting interlayer signal crosstalk in a multilayer detector, in order to solve problems such as interlayer signal crosstalk caused by interlayer ray scattering inside the multilayer detector and the resulting artifacts in the energy spectrum reconstruction image in related technologies.

[0004] The first aspect of this application provides a method for correcting interlayer crosstalk in a multilayer detector, comprising the following steps: acquiring projection signals of each layer collected by the multilayer detector under target scanning parameters; determining interlayer crosstalk correction convolution kernels for different layers in the multilayer detector based on the structural parameters of the multilayer detector and the target scanning parameters, wherein the interlayer crosstalk correction convolution kernels represent a first mapping relationship between the interlayer crosstalk signal and the projection signals of each layer; estimating the interlayer crosstalk signal in the multilayer detector based on the projection signals of each layer and the interlayer crosstalk correction convolution kernels; and correcting the projection signals of each layer based on the interlayer crosstalk signal.

[0005] Optionally, the expression for the projection signal of each layer during the scanning process with an object is:

[0006] Projection signals of each layer

[0007]

[0008] In the formula, the subscript i represents the i-th layer detector, and there are a total of N layers of detectors; This represents the projection signal collected by the i-th layer detector, and the object has a total of The composition of the base material is given by the subscript j, which indicates the j-th base material. Indicates the first The equivalent energy spectrum of the layer projection. This indicates the maximum energy of the energy spectrum; Indicates the first The mass decay coefficient of the seed material at energy E Indicates the first Density distribution of the seed material; in the projection signal obtained from actual measurements This represents the main beam projection signal, which is the target signal to be measured during scanning. This indicates the scattered signal caused by Comp scattering or Rayleigh scattering of the scanning rays in the object. and This indicates that the interlayer crosstalk signal caused by the scattering of X-rays within the detector during the absorption process can cause deviations in the target measurement signal.

[0009] Optionally, based on the structural parameters and target scanning parameters of the multilayer detector, the interlayer crosstalk correction convolution kernels of different layers in the multilayer detector are determined, including: reading a second mapping table of structural parameters, target scanning parameters, and interlayer crosstalk correction convolution kernel parameters; and querying the second mapping table based on the structural parameters and target scanning parameters of the multilayer detector to determine the interlayer crosstalk correction convolution kernels of different layers in the multilayer detector.

[0010] Optionally, before reading the second mapping table of structural parameters, target scanning parameters, and interlayer crosstalk correction convolution kernels, the method further includes: determining the structural parameters and target scanning parameters of the multilayer detector; establishing a Monte Carlo simulation model based on the structural parameters and target scanning parameters; simulating the interlayer scattering process of the multilayer detector based on the Monte Carlo simulation model to obtain the interlayer crosstalk signal caused by interlayer scattering in the projection signal of the corresponding layer, and acquiring the X-ray source energy spectrum of the corresponding layer; using a pencil beam X-ray source to obtain the intensity and shape distribution of the crosstalk signal of each layer, and performing numerical fitting to obtain the interlayer crosstalk correction convolution kernel parameters under the structural parameters and target scanning parameters of the multilayer detector; and constructing a second mapping table based on the structural parameters, target scanning parameters, and interlayer crosstalk correction convolution kernel parameters.

[0011] Optionally, the inter-layer crosstalk signal corresponding to each layer projection signal is estimated based on the projection signal of each layer and the inter-layer crosstalk correction convolution kernel, including: reading the projection signal of each layer and the inter-layer crosstalk correction convolution kernel; convolving the projection signal of each layer and the inter-layer crosstalk correction convolution kernel to estimate the inter-layer crosstalk signal corresponding to each layer projection signal.

[0012] Optionally, the corrected projection signals of each layer are obtained based on the projection signals of each layer and the corresponding estimated inter-layer crosstalk signal layer, including: subtracting the inter-layer crosstalk signal from the projection signals of each layer of the corresponding layer to obtain the corrected projection signals of each layer.

[0013] Optionally, after correcting the interlayer signal crosstalk of the corresponding layer's projection signals based on the layer projection signals and the interlayer crosstalk correction convolution kernel, the method further includes: reconstructing the energy spectrum image based on the crosstalk-corrected layer projection signals.

[0014] A second aspect of this application provides a multilayer detector interlayer crosstalk correction device, comprising: an acquisition module for acquiring projection signals of each layer of the multilayer detector under target scanning parameters; a determination module for determining interlayer crosstalk correction convolution kernels for different layers in the multilayer detector based on the structural parameters and target scanning parameters of the multilayer detector, wherein the interlayer crosstalk correction convolution kernels represent a first mapping relationship between the interlayer crosstalk signal and the projection signals of each corresponding layer; and a correction module for estimating the interlayer crosstalk signal in the multilayer detector based on the projection signals of each layer and the interlayer crosstalk correction convolution kernels, and correcting the projection signals of each layer based on the interlayer crosstalk signal.

[0015] Optionally, the expression for the projection signal of each layer during the scanning process with an object is:

[0016] Projection signals of each layer

[0017]

[0018] In the formula, the subscript i represents the i-th layer detector, and there are a total of N layers of detectors; This represents the projection signals of each layer collected by the i-th layer detector, and the total number of layers of the object is... The composition of the base material is given by the subscript j, which indicates the j-th base material. Indicates the first The equivalent energy spectrum of the layer projection. This indicates the maximum energy of the energy spectrum; Indicates the first The mass decay coefficient of the seed material at energy E Indicates the first Density distribution of the seed material; in the actual measured projection signals of each layer... This represents the main beam projection signal, which is the target signal to be measured during scanning. This indicates the scattered signal caused by Comp scattering or Rayleigh scattering of the scanning rays in the object. and This indicates that the interlayer crosstalk signal caused by the scattering of X-rays within the detector during the absorption process can cause deviations in the target measurement signal.

[0019] Optionally, the determining module is further configured to: read a second mapping table of structural parameters, target scanning parameters, and interlayer crosstalk correction convolution kernel parameters; and query the second mapping table based on the structural parameters and target scanning parameters of the multilayer detector to determine the interlayer crosstalk correction convolution kernels of different layers in the multilayer detector.

[0020] Optionally, the multilayer detector interlayer signal crosstalk correction device further includes: a construction module, used to determine the structural parameters and target scanning parameters of the multilayer detector before reading the second mapping relationship table of structural parameters, target scanning parameters, and interlayer crosstalk correction convolution kernel; to establish a Monte Carlo simulation model based on the structural parameters and target scanning parameters; to simulate the interlayer scattering process of the multilayer detector based on the Monte Carlo simulation model to obtain the interlayer crosstalk signal caused by interlayer scattering in the projection signal of the corresponding layer, and to collect the X-ray source energy spectrum of the corresponding layer; to obtain the intensity and shape distribution of the crosstalk signal of each layer using a pencil beam X-ray source, and to perform numerical fitting to obtain the interlayer crosstalk correction convolution kernel parameters under the structural parameters and target scanning parameters of the multilayer detector; and to construct the second mapping relationship table based on the structural parameters, target scanning parameters, and interlayer crosstalk correction convolution kernel parameters.

[0021] Optionally, the correction module is further configured to: read the projection signals of each layer and the interlayer crosstalk correction convolution kernel; and convolve the projection signals of each layer and the interlayer crosstalk correction convolution kernel to estimate the interlayer crosstalk signal corresponding to the projection signals of each layer.

[0022] Optionally, the correction module is further configured to: subtract interlayer crosstalk signals from the projection signals of each corresponding layer to obtain the corrected projection signals of each layer.

[0023] Optionally, the multilayer detector interlayer signal crosstalk correction device further includes: a reconstruction module for reconstructing the energy spectrum image based on the projection signals of each layer after interlayer signal crosstalk correction.

[0024] A third aspect of this application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the program to implement the multilayer detector interlayer signal crosstalk correction method as described in the above embodiments.

[0025] A fourth aspect of this application provides a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement the multilayer detector interlayer signal crosstalk correction method as described in the above embodiments.

[0026] Therefore, this application has the following beneficial effects: This application embodiment first acquires the projection signals of each layer of a multilayer detector under target scanning parameters. Then, combining the detector structural parameters and scanning parameters, it determines the interlayer signal crosstalk correction convolution kernel, which characterizes the relationship between interlayer crosstalk signals and detector projection signals, using methods such as Monte Carlo simulation. Based on the convolution kernel, it estimates the corresponding interlayer crosstalk signal intensity in each layer's projection signal and subtracts it from the measured projection signal, thereby completing the interlayer crosstalk correction of each layer's projection signal. The processing method of this application embodiment fully integrates the detector hardware characteristics and scanning conditions to achieve targeted correction. The correction logic closely follows the actual signal transmission law, resulting in high reliability of the correction results. It can optimize the overall data quality of the multilayer detection system, effectively eliminate signal crosstalk interference generated between different detection layers during the operation of the multilayer detector, significantly improve the acquisition accuracy and signal purity of each layer's projection signal, and enhance the overall detection stability and accuracy of the equipment. Therefore, it solves the technical problems in related technologies such as interlayer signal crosstalk caused by interlayer ray scattering within the multilayer detector and the resulting energy spectrum reconstruction image artifacts.

[0027] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart of a method for correcting interlayer signal crosstalk in a multilayer detector according to an embodiment of this application; Figure 2 This is a comparison image of a material decomposition matrix before and after interlayer crosstalk correction, according to an embodiment of this application. Figure 3 This is a comparison image of virtual monoenergetic images of different energies before and after interlayer crosstalk correction, according to an embodiment of this application. Figure 4 This is a schematic diagram of a multilayer detector interlayer signal crosstalk correction device provided according to an embodiment of this application; Figure 5 This is a schematic diagram of the structure of an electronic device according to an embodiment of this application. Detailed Implementation

[0029] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0030] The following describes a method, apparatus, and electronic device for correcting interlayer crosstalk in a multilayer detector according to embodiments of this application, with reference to the accompanying drawings. Addressing the interlayer crosstalk caused by interlayer ray scattering within the multilayer detector and the resulting image artifacts in the energy spectrum reconstruction, as mentioned in the background art, this application provides a method for correcting interlayer crosstalk in a multilayer detector. In this method, embodiments of this application first acquire the projection signals of each layer of the multilayer detector under target scanning parameters. Then, combining the detector structural parameters and scanning parameters, a crosstalk correction convolution kernel characterizing the relationship between the interlayer crosstalk signal and the detector projection signal is determined using methods such as Monte Carlo simulation. The crosstalk signal intensity corresponding to each layer's projection signal is estimated based on the convolution kernel and subtracted from the measured projection signal, thereby completing the crosstalk correction for each layer's projection signal. The processing method of this application fully combines the detector hardware characteristics and scanning conditions to complete targeted correction. The correction logic conforms to the actual signal transmission law, and the correction result has high reliability. It can optimize the overall data quality of the multi-layer detection system, effectively eliminate signal crosstalk interference generated between different detection layers during the operation of the multi-layer detector, significantly improve the acquisition accuracy and signal purity of the projection signals of each layer, and improve the overall detection stability and detection accuracy of the equipment. Thus, it solves the problems of energy spectrum reconstruction image artifacts caused by inter-layer signal crosstalk in related technologies.

[0031] Specifically, Figure 1 This is a flowchart illustrating a method for correcting crosstalk between layers of a multilayer detector, as provided in an embodiment of this application.

[0032] like Figure 1 As shown, the method for correcting crosstalk between layers of a multilayer detector includes the following steps: In step S101, the projection signals of each layer collected by the multilayer detector under the target scanning parameters are obtained.

[0033] Among them, the multilayer detector is a detection device that receives X-ray signals in layers. The upper layer mainly absorbs low-energy X-rays, while the lower layer mainly absorbs higher-energy X-rays, thereby realizing multi-energy imaging; the target scanning parameters are the set indicators that control the scanning operation; and the projection signals of each layer are the raw measurement data obtained by layer acquisition.

[0034] It is understood that the embodiments of this application rely on predetermined scanning parameters to drive a multi-layer detector to complete the scanning operation, capture the corresponding projection signals layer by layer, and completely retain the layered transmission imaging information of the target object. This can accurately restore the internal structure of the target and improve the integrity and detail recognition of the detection data.

[0035] Specifically, this application embodiment configures preset target scanning parameters in the energy spectrum CT system. These parameters include scanning tube voltage, tube current, pre-filtering of the X-ray source, scanning geometry, and other parameters. The target scanning parameters determine the operating conditions such as scanning exposure intensity, acquisition timing, and detection working mode. The control system completes a single unified exposure operation, allowing X-rays to penetrate the target object. The X-ray signal carrying information about the target's internal structure is synchronously incident on a multi-layer flat panel detector array. Relying on the differentiated energy spectrum response characteristics of each detector layer, each detector layer independently captures transmission projection data under the corresponding equivalent energy spectrum dimension. The signal acquisition of all detector layers is completed within a single exposure cycle. Finally, the acquisition results of all detector layers are integrated, and N sets of complete projection signals corresponding to different energy spectra are output in batches, achieving accurate acquisition of projection signals for each layer.

[0036] Furthermore, in the embodiments of this application, the expression for the projection signal of each layer during the scanning process with an object is as follows:

[0037] Projection signals of each layer

[0038]

[0039] In the formula, the subscript i represents the i-th layer detector, and there are a total of N layers of detectors; This represents the projection signal collected by the i-th layer detector, and the object has a total of The composition of the base material is given by the subscript j, which indicates the j-th base material. Indicates the first The equivalent energy spectrum of the layer projection. This indicates the maximum energy of the energy spectrum; Indicates the first The mass decay coefficient of the seed material at energy E Indicates the first Density distribution of the seed material; in the projection signal obtained from actual measurements This represents the main beam projection signal, which is the target signal to be measured during scanning. This indicates the scattered signal caused by Comp scattering or Rayleigh scattering of the scanning rays in the object. and This refers to the interlayer crosstalk signal caused by the scattering of X-rays within the detector during the absorption process.

[0040] It is understood that the embodiments of this application quantify the combined influence of the main beam projection signal, the object scattering signal and the interlayer crosstalk signal on the detection results by constructing mathematical expressions for the projection signals of each layer of the multi-layer detector, and characterize the attenuation process of rays penetrating objects under different energy spectra. This can effectively characterize the physical composition and formation mechanism of the signals collected by each detector layer, and realize the theoretical modeling and quantitative description of multi-energy spectrum projection data.

[0041] Specifically, the expressions for the projection signals of each layer are based on the positional distribution and material properties of each layer of the multilayer detector. It is clear that the interlayer crosstalk signal is mainly caused by the scattering of rays in the detector's encapsulation shell and the upper detector layer, which is absorbed by the lower detector. Therefore, the lower layer is more significantly affected by the crosstalk signal. The process of interlayer signal crosstalk correction is to estimate the signal components from shell scattering and interlayer scattering in the actual measured projection signals of each layer detector, and subtract them to obtain the interlayer crosstalk corrected projection signals of each layer.

[0042] Without any correction, the projection signals of each layer measured by the detector contain object scattering signals and interlayer crosstalk signals. In the actual detection process of multilayer detectors, both scattering signals and interlayer crosstalk signals will interfere with the original measurement results. In order to ensure the accuracy and reliability of the detection data, it is necessary to perform fine calculations on the two types of interference signals and effectively remove them from the acquired measurement signals.

[0043] Therefore, the embodiments of this application rely on predetermined scanning parameters to drive a multi-layer detector to complete the detection operation, capture the corresponding projection signals of each layer one by one, and completely retain the layered transmission imaging information of the target object. This can accurately restore the internal structure of the target and improve the integrity and detail recognition of the detection data.

[0044] In step S102, based on the structural parameters and target scanning parameters of the multilayer detector, the interlayer crosstalk correction convolution kernels of different layers in the multilayer detector are determined. The interlayer crosstalk correction convolution kernels represent the first mapping relationship between the interlayer crosstalk signal and the projection signal of each layer.

[0045] Among them, structural parameters are parameters that define the layer arrangement, size specifications, and material properties of multilayer detectors, mainly including the crystal material and thickness of each detector layer, the distance between layers, etc., which seriously affect the intensity and distribution of interlayer signal crosstalk; the interlayer crosstalk correction convolution kernel is a computational parameter used to estimate the interlayer interference signal; the interlayer crosstalk signal is the interference signal formed after scattering during the penetration of rays through the detector layers; the first mapping relationship is the corresponding rule for converting the projection signal of each layer into the crosstalk signal. According to the first mapping relationship, the corresponding interlayer crosstalk signal can be estimated from the projection signal measured in each layer.

[0046] It is understood that the embodiments of this application combine the structural parameters of the multilayer detector with the target scanning parameters to obtain the interlayer crosstalk correction convolution kernel corresponding to each detection layer. Based on the interlayer crosstalk correction convolution kernel, a mapping relationship between the interlayer crosstalk signal and the projection signal of each layer is constructed to characterize the interlayer signal interference law, correct the crosstalk of the detection signal, reduce the data deviation caused by the mutual interference of signals between different detection layers, restore the true projection signal of each layer, and improve the accuracy of detection data and imaging quality.

[0047] Specifically, this application embodiment relies on structural parameters such as the thickness, material properties, and spacing of each layer of the multilayer detector, combined with scanning parameters such as the radiation energy range and geometric relationship of the target scan, to collect the original response signals of each detection layer and the standard energy spectrum data of the radiation source. On this basis, the characteristics of interlayer crosstalk scattering signals generated by radiation penetration, scattering, and secondary radiation between each detection layer are analyzed, and a quantitative correspondence between the interlayer crosstalk signal and the normal projection signals of each layer is established, which is the first mapping relationship. It can quantitatively characterize the interference form, influence degree, and transmission law of the crosstalk signal on the projection signals of each layer. Based on the first mapping relationship, the calculation basis for processing interlayer signal interference can be determined.

[0048] Subsequently, based on the first mapping relationship, signal inversion and convolution operation are iteratively optimized to eliminate the inherent response deviation of the detector and scanning noise interference. The dedicated interlayer crosstalk correction convolution kernels for each layer are fitted and matched to accurately quantify the crosstalk weights and attenuation rules of different detector interlayer crosstalk signals. Finally, the convolution kernel solution and calibration adapted to the detector structure and scanning conditions are completed, and the accurate correction of interlayer crosstalk is achieved.

[0049] Furthermore, in the embodiments of this application, determining the interlayer crosstalk correction convolution kernels of different layers in the multilayer detector based on the structural parameters and target scanning parameters of the multilayer detector includes: reading a second mapping table of structural parameters, target scanning parameters, and interlayer crosstalk correction convolution kernels; and querying the second mapping table based on the structural parameters and target scanning parameters of the multilayer detector to determine the interlayer crosstalk correction convolution kernels of different layers in the multilayer detector.

[0050] The second mapping table is a set of correspondences between storage layer crosstalk correction convolution kernels.

[0051] It is understood that the embodiments of this application determine the interlayer crosstalk correction convolution kernels of different layers in the multilayer detector by reading the second mapping table of the structural parameters, target scanning parameters and interlayer crosstalk correction convolution kernels of the multilayer detector, and querying the second mapping table according to the structural parameters and target scanning parameters. This method realizes the rapid matching and acquisition of convolution kernels, effectively improves the efficiency and consistency of interlayer crosstalk correction, ensures the accuracy of interlayer crosstalk signal correction of different detectors, reduces image artifacts, and enhances the stability and imaging quality of the multilayer detector imaging system.

[0052] Specifically, in this embodiment, the structural parameters, target scanning parameters, and interlayer crosstalk correction convolution kernels of the multilayer detector are read from a second mapping table. The structural parameters and target scanning parameters of the current multilayer detector are used as query keywords to perform matching and retrieval in the second mapping table. The interlayer crosstalk correction convolution kernels of each detector layer that are completely corresponding to the current device structure and scanning conditions are selected. By calculating the interlayer crosstalk correction convolution kernels, the distribution characteristics of interlayer crosstalk signals under different energy conditions can be obtained. The distribution of interlayer crosstalk signals under different energies can be obtained, thereby determining the convolution kernel parameters and morphology required for the interlayer crosstalk correction stage, and realizing the rapid determination of the interlayer crosstalk correction convolution kernels.

[0053] Furthermore, in the embodiments of this application, before reading the second mapping table of structural parameters, target scanning parameters, and interlayer crosstalk correction convolution kernels, the method further includes: determining the structural parameters and target scanning parameters of the multilayer detector; establishing a Monte Carlo simulation model based on the structural parameters and target scanning parameters; simulating the interlayer scattering process of the multilayer detector based on the Monte Carlo simulation model to obtain the interlayer crosstalk signal caused by interlayer scattering in the projection signal of the corresponding layer, and acquiring the X-ray source energy spectrum of the corresponding layer; using a pencil beam X-ray source to obtain the intensity and shape distribution of the crosstalk signal of each layer, and performing numerical fitting to obtain the interlayer crosstalk correction convolution kernel parameters under the structural parameters and target scanning parameters of the multilayer detector; and constructing a second mapping table based on the structural parameters, target scanning parameters, and interlayer crosstalk correction convolution kernel parameters.

[0054] Among them, the Monte Carlo simulation model is a probabilistic calculation model that simulates the interaction process between a multilayer detector and rays; the interlayer scattering process is the physical transmission process of rays scattering and crosstalk between the layers of the detector.

[0055] Specifically, before retrieving the second mapping table, this embodiment of the application needs to clarify the structural parameters and target scanning parameters of the multilayer detector, build a Monte Carlo simulation model based on the structural parameters and target scanning parameters of the multilayer detector, set a pencil beam X-ray source to irradiate the detector in the Monte Carlo simulation model, simulate the interlayer scattering process inside the detector, extract the interlayer crosstalk signal in the projection signal of each layer, and use the interlayer scattering point spread function output by the pencil beam X-ray source as an equivalent interlayer crosstalk correction convolution kernel. Then, integrate the detector structural parameters, target scanning parameters and the generated correction convolution kernel to complete the construction of the second mapping table.

[0056] Therefore, this application embodiment combines the structural parameters of the multilayer detector with the target scanning parameters to obtain the interlayer crosstalk correction convolution kernel corresponding to each detection layer. The interlayer crosstalk correction convolution kernel is used to characterize the mapping relationship between the interlayer crosstalk signal and the projected signal of each measured layer. Based on the actual parameters, the matching convolution kernel is customized to fit the actual working conditions of X-ray propagation and scattering. It can effectively offset the signal deviation caused by interlayer signal crosstalk due to interlayer scattering of the detector, restore the true detection signal characteristics, improve the accuracy of detection data, and determine the interlayer crosstalk correction convolution kernel of different layers in the multilayer detector. This method can be adapted to different detection levels and scanning scenarios, and the correction is more targeted. It can reduce the impact of crosstalk interference from the source and optimize the energy spectrum imaging performance of the multilayer detector.

[0057] In step S103, the interlayer crosstalk signal in the multilayer detector is estimated based on the projection signals of each layer and the crosstalk correction convolution kernel, and the projection signals of each layer are corrected based on the crosstalk signal.

[0058] It is understood that the embodiments of this application estimate the interlayer signal crosstalk correction convolution kernel of each layer, combine the projection signal of each layer with the interlayer crosstalk correction convolution kernel to derive the interlayer crosstalk signal of the corresponding layer, and remove it from the original measurement signal, thereby realizing interlayer signal crosstalk correction. This can identify and cancel the interference components caused by interlayer scattering of the detector, and effectively restore the true value of the projection signal of each layer.

[0059] Specifically, this application addresses the interlayer crosstalk problem in multilayer detector imaging. First, it performs in-depth analysis and quantization on the original projection signals acquired from each detector layer to estimate the interlayer crosstalk signal components mixed in the projection signals, distinguishing between the effective detection signal and interference signals caused by interlayer scattering. The calculation formula for estimating the interlayer crosstalk signal using the projection signals of each layer and the interlayer crosstalk correction convolution kernel is as follows:

[0060] in, It is the inter-layer crosstalk signal of the i-th layer. For the first One projection, To correct convolution kernels for interlayer signal crosstalk, This represents the convolution process.

[0061] Furthermore, in the embodiments of this application, correcting the interlayer signal crosstalk of the projection signals of each layer of the corresponding layer based on the interlayer crosstalk signal and the interlayer crosstalk correction convolution kernel includes: subtracting the interlayer crosstalk signal from the projection signals of each layer of the corresponding layer to obtain the corrected projection signals of each layer.

[0062] Specifically, without any correction, the integral projection image of the object's linear attenuation coefficient is obtained through direct negative logarithmic transformation. The formula for calculating the integral projection image is as follows:

[0063] in, Represents the integral projection image of an object. Indicates the first One projection, This represents an air scan image signal without any objects present.

[0064] The correction process involves removing the estimated crosstalk signal from the measured signal. Therefore, the formula for the integral projection image of the linear attenuation coefficient of the corrected object is:

[0065] in, It is the corrected object projection data. Indicates the first One projection, It is the estimated object scattering signal. It is the inter-layer crosstalk signal at the detector end when there is no object. It is the inter-layer crosstalk signal at the detector end when there is an object. This represents an air scan image signal without any objects present.

[0066] In the above formula, object scattering The scope of protection outside this patent can be estimated using existing methods, or when the scanning conditions are set to narrow fan-beam scanning. Extremely small, approximating to 0, requiring no correction, but interlayer crosstalk signal It still exists.

[0067] Therefore, the embodiments of this application need to directly subtract the interlayer crosstalk signal component of the corresponding layer from the original projection signals of each layer, directionally eliminate the influence of crosstalk interference on the effective detection signal, efficiently remove the invalid interference components caused by interlayer scattering, and complete the interlayer signal crosstalk correction of the projection signals of each layer.

[0068] Furthermore, in the embodiments of this application, after correcting the interlayer signal crosstalk of the corresponding layer's projection signals based on the layer projection signals and the interlayer crosstalk correction convolution kernel, the method further includes: reconstructing the energy spectrum image based on the crosstalk-corrected layer projection signals.

[0069] It is understood that, in this embodiment of the application, after completing the crosstalk correction of the interlayer projection signals of each layer, the energy spectrum image reconstruction is carried out using the corrected pure projection signals of each layer. Relying on the high-precision projection data after removing the crosstalk interference, the image artifacts caused by the interlayer ray scattering of the detector can be effectively eliminated, the reconstruction quality of the energy spectrum image can be improved, the true material attenuation information of the scanned object at different energies can be restored, the overall quality of the energy spectrum imaging of the multilayer detector can be improved, the reconstruction error caused by signal distortion can be reduced, and the accuracy and reliability of the system in the application of energy spectrum imaging can be improved.

[0070] Specifically, in this embodiment, after completing interlayer crosstalk correction and obtaining pure and effective projection signals for each layer, the density projection of the base material can be obtained based on the corrected energy spectrum data using a projection domain material decomposition algorithm. Then, the density distribution of different base materials can be reconstructed using the FDK (Feldkamp-Davis-Kress, cone-beam filter back projection) reconstruction algorithm. The density images of the base materials are weighted and summed to obtain a virtual monoenergetic image of the scanned object at the energy level. Alternatively, energy spectrum image reconstruction can be achieved through image domain decomposition or one-step iterative decomposition.

[0071] For example, such as Figure 2 As shown, in cranial cone-beam CT spectral imaging, the material decomposition and reconstruction results before inter-slice signal crosstalk correction show significant errors at the boundary between soft tissue and bone, resulting in bright artifacts in water-based images. This also leads to… Figure 3 The virtual monocular image in the image contains artifacts that affect image quality and may lead to misdiagnosis. The comparison of the results before and after correction shows that the artifacts are basically removed after interlayer crosstalk correction, which significantly improves image quality.

[0072] Therefore, the embodiments of this application estimate the crosstalk correction convolution kernel through Monte Carlo simulation, and then calculate and estimate the crosstalk signal of each layer based on the projection signal of each layer and the correction convolution kernel, thereby completing the crosstalk correction of the projection signal of each layer. This can identify and cancel the crosstalk signal components caused by interlayer scattering of the detector, effectively restore the true value of the projection signal of each layer, greatly reduce the mutual influence of signals between different detection layers of the multilayer detector, and improve the purity and data accuracy of the original projection signal of each layer.

[0073] To better understand the solution of this application, the following specific embodiment is used to describe the method or execution flow of interlayer signal crosstalk correction for multilayer detectors, as follows: The embodiments of this application can be applied to flat panel detectors in the medical field. By constructing interlayer crosstalk correction convolution kernels to quantify the interlayer signal mapping relationship, and by subtracting interlayer crosstalk signals from the projection signals of each corresponding layer, the mutual interference of interlayer signals caused by the multi-layer detection structure is eliminated, thereby improving the accuracy of X-ray projection data acquired by the flat panel detector.

[0074] The embodiments of this application mainly include: an X-ray source, a multilayer detector module (the number of detector layers is ≥2), and mechanical / electrical control and data transmission / processing units. The embodiments of this application are not limited to a specific multilayer detector technology; therefore, the system should include different features corresponding to different multilayer detector models.

[0075] In an energy-spectral CT system, each detector layer can acquire projection data under an equivalent energy spectrum in a single exposure. Therefore, an N-layer flat panel detector can output N projections under different energy spectra. For an N-layer flat panel detector (N≥2), after object attenuation, the signal acquired by the i-th layer detector is as shown in formula (1):

[0076] The air scan image signal without objects is shown in Equation (2):

[0077] In the formula, the subscript i represents the i-th layer detector, and there are a total of N layers of detectors; This represents the projection signal collected by the i-th layer detector, and the object has a total of The composition of the base material is given by the subscript j, which indicates the j-th base material. Indicates the first The equivalent energy spectrum of the layer projection. This indicates the maximum energy of the energy spectrum; Indicates the first The mass decay coefficient of the seed material at energy E Indicates the first Density distribution of the seed material; in the projection signal obtained from actual measurements This represents the main beam projection signal, which is the target signal to be measured during scanning. This indicates the scattered signal caused by Comp scattering or Rayleigh scattering of the scanning rays in the object. and This refers to the interlayer crosstalk signal caused by the scattering of X-rays within the detector during the absorption process.

[0078] Without any correction, the integral projection image of the linear attenuation coefficient of the object is obtained by direct negative logarithmic transformation, as shown in formula (3):

[0079] in, Represents the integral projection image. Indicates the first One projection, This represents an air scan image signal without any objects present.

[0080] Images reconstructed directly from this projection will exhibit noticeable image artifacts caused by object scattering and interlayer signal crosstalk.

[0081] The corrected projection expression is shown in formula (4):

[0082] in, These are the corrected object projection data. It is the estimated object scattering signal. This represents the estimated inter-layer crosstalk signal at the detector when there are no objects. This represents the inter-layer crosstalk signal at the detector when an object is present. The formula represents subtracting the object's scattering signal and the detector's inter-layer crosstalk signal from the measurement data, thereby eliminating the influence of these interfering signals.

[0083] Object scattering can be estimated using existing methods, or when the scanning conditions are set to narrow fan-beam scanning. Extremely small, approximating to 0, requiring no correction, but interlayer crosstalk signal It still exists.

[0084] In the embodiments of this application, Modeled as and an interlayer scattering convolution kernel The convolution is shown in formula (5):

[0085] in, It is the inter-layer crosstalk signal at the detector end when there is no object. For the first One projection, It is an interlayer scattering convolution kernel.

[0086] The interlayer crosstalk signal in the air scan image is also obtained by convolution, as shown in formula (6):

[0087] in, It is the interlayer crosstalk signal in the air scan image. It is an air scan image signal without objects. It is the inter-layer crosstalk convolution kernel of the i-th layer.

[0088] Convolution kernels of different detector layers They are different. They can be obtained through precise simulation calculations of the detector using the Monte Carlo method, or through the ligature method, or a combination of both. For example, a pencil beam X-ray source can be used to irradiate the detector through Monte Carlo simulation, and the resulting point spread function can be approximated as the convolution kernel required for interlayer crosstalk signal correction.

[0089] Based on the corrected energy spectrum data The density projection of the substrate material can be obtained by using the projection domain material decomposition algorithm. Then, the density distribution of different substrate materials can be reconstructed using the FDK reconstruction algorithm. By weighted summation of the density images of the substrate materials, the energy distribution of the scanned object can be obtained. A virtual monoenergetic image can be generated. Alternatively, the energy spectrum image can be reconstructed through image domain decomposition or one-step iterative decomposition.

[0090] In summary, the multilayer detector interlayer crosstalk correction method proposed in this application first acquires the projection signals of each layer collected by the multilayer detector under the target scanning parameters. Then, combining the detector structural parameters and scanning parameters, it determines the interlayer crosstalk correction convolution kernel, which characterizes the relationship between the interlayer crosstalk signal and the detector projection signal, using methods such as Monte Carlo simulation. Based on the convolution kernel, it estimates the corresponding interlayer crosstalk signal strength in the projection signal of each layer and subtracts it from the measured projection signal, thereby completing the interlayer crosstalk correction of the projection signals of each layer. The processing method of this application fully combines the detector hardware characteristics and scanning conditions to complete targeted correction. The correction logic conforms to the actual signal transmission law, and the correction result has high reliability. It can optimize the overall data quality of the multilayer detection system, effectively eliminate the signal crosstalk interference generated between different detection layers during the operation of the multilayer detector, significantly improve the acquisition accuracy and signal purity of the projection signals of each layer, and improve the overall detection stability and detection accuracy of the equipment.

[0091] Next, with reference to the accompanying drawings, a multilayer detector interlayer signal crosstalk correction device according to an embodiment of this application is described.

[0092] Figure 4 This is a block diagram of a multilayer detector interlayer signal crosstalk correction device according to an embodiment of this application.

[0093] like Figure 4 As shown, the multilayer detector interlayer signal crosstalk correction device includes: an acquisition module 401, a determination module 402, and a correction module 403.

[0094] The acquisition module 401 is used to acquire the projection signals of each layer of the multilayer detector under the target scanning parameters; the determination module 402 is used to determine the interlayer crosstalk correction convolution kernel of different layers in the multilayer detector according to the structural parameters of the multilayer detector and the target scanning parameters, wherein the interlayer crosstalk correction convolution kernel represents the first mapping relationship between the interlayer crosstalk signal and the projection signal of each layer; and the correction module 403 is used to estimate the interlayer crosstalk signal in the multilayer detector according to the projection signal of each layer and the interlayer crosstalk correction convolution kernel, and correct the projection signal of each layer according to the interlayer crosstalk signal.

[0095] Furthermore, the expressions for the projection signals of each layer during the scanning process with an object are as follows:

[0096] Projection signals of each layer

[0097]

[0098] In the formula, the subscript i represents the i-th layer detector, and there are a total of N layers of detectors; This represents the projection signal collected by the i-th layer detector, and the object has a total of The composition of the base material is given by the subscript j, which indicates the j-th base material. Indicates the first The equivalent energy spectrum of the layer projection. This indicates the maximum energy of the energy spectrum; Indicates the first The mass decay coefficient of the seed material at energy E Indicates the first Density distribution of the seed material; in the projection signal obtained from actual measurements This represents the main beam projection signal, which is the target signal to be measured during scanning. This indicates the scattered signal caused by Comp scattering or Rayleigh scattering of the scanning rays in the object. and This refers to the interlayer crosstalk signal caused by the scattering of X-rays within the detector during the absorption process.

[0099] Furthermore, the determination module 402 is used to: read the second mapping table of structural parameters, target scanning parameters, and interlayer crosstalk correction convolution kernels; and query the second mapping table according to the structural parameters and target scanning parameters of the multilayer detector to determine the interlayer crosstalk correction convolution kernels of different layers in the multilayer detector.

[0100] Furthermore, the multilayer detector interlayer signal crosstalk correction device also includes: a construction module, used to determine the structural parameters and target scanning parameters of the multilayer detector before reading the second mapping relationship table of structural parameters, target scanning parameters, and interlayer crosstalk correction convolution kernel; to establish a Monte Carlo simulation model based on the structural parameters and target scanning parameters; to simulate the interlayer scattering process of the multilayer detector based on the Monte Carlo simulation model to obtain the interlayer crosstalk signal caused by interlayer scattering in the projection signal of the corresponding layer, and to collect the X-ray source energy spectrum of the corresponding layer; to obtain the intensity and shape distribution of the crosstalk signal of each layer using a pencil beam X-ray source, and to perform numerical fitting to obtain the interlayer crosstalk correction convolution kernel parameters under the structural parameters and target scanning parameters of the multilayer detector; and to construct the second mapping relationship table based on the structural parameters, target scanning parameters, and interlayer crosstalk correction convolution kernel.

[0101] Furthermore, the correction module 403 is used to: subtract the interlayer crosstalk signal from the projection signals of each layer of the corresponding layer to obtain the corrected projection signals of each layer.

[0102] Furthermore, the multilayer detector interlayer signal crosstalk correction device also includes: a reconstruction module, used to correct the interlayer signal crosstalk of the corresponding layer's projection signals based on the interlayer crosstalk signal and the interlayer crosstalk correction convolution kernel, and then reconstruct the energy spectrum image based on the crosstalk-corrected projection signals of each layer.

[0103] It should be noted that the foregoing explanation of the embodiment of the multilayer detector interlayer signal crosstalk correction method also applies to the multilayer detector interlayer signal crosstalk correction device of this embodiment, and will not be repeated here.

[0104] In summary, the multilayer detector interlayer crosstalk correction device proposed in this application first acquires the projection signals of each layer collected by the multilayer detector under the target scanning parameters. Then, combining the detector structural parameters and scanning parameters, it determines the interlayer crosstalk correction convolution kernel characterizing the relationship between the interlayer crosstalk signal and the detector projection signal through methods such as Monte Carlo simulation. Based on the convolution kernel, it estimates the corresponding interlayer crosstalk signal strength in each layer's projection signal and subtracts it from the measured projection signal, thereby completing the interlayer crosstalk correction of each layer's projection signal. The processing method of this application fully combines the detector hardware characteristics and scanning conditions to complete targeted correction. The correction logic conforms to the actual signal transmission law, and the correction result has high reliability. It can optimize the overall data quality of the multilayer detection system, effectively eliminate signal crosstalk interference generated between different detection layers during the operation of the multilayer detector, significantly improve the acquisition accuracy and signal purity of each layer's projection signal, and enhance the overall detection stability and accuracy of the equipment.

[0105] Figure 5 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application. The electronic device may include: The memory 501, the processor 502, and the computer program stored on the memory 501 and capable of running on the processor 502.

[0106] When the processor 502 executes the program, it implements the multilayer detector interlayer signal crosstalk correction method provided in the above embodiments.

[0107] Furthermore, electronic devices also include: Communication interface 503 is used for communication between memory 501 and processor 502.

[0108] The memory 501 is used to store computer programs that can run on the processor 502.

[0109] The memory 501 may include high-speed RAM (Random Access Memory) memory, and may also include non-volatile memory, such as at least one disk storage.

[0110] If the memory 501, processor 502, and communication interface 503 are implemented independently, then the communication interface 503, memory 501, and processor 502 can be interconnected via a bus to complete communication between them. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 5 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0111] Optionally, in a specific implementation, if the memory 501, processor 502, and communication interface 503 are integrated on a single chip, then the memory 501, processor 502, and communication interface 503 can communicate with each other through an internal interface.

[0112] The processor 502 may be a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of this application.

[0113] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the above-described method for correcting crosstalk between layers of multilayer detectors.

[0114] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0115] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0116] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0117] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any of the following techniques known in the art, or a combination thereof: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (FPGAs), field-programmable gate arrays (FPGAs), etc.

[0118] Those skilled in the art will understand that all or part of the steps of the methods implementing the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0119] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A method for correcting crosstalk between layers of a multilayer detector, characterized in that, Includes the following steps: Acquire projection signals of each layer from the multilayer detector under target scanning parameters; Based on the structural parameters of the multilayer detector and the target scanning parameters, the interlayer crosstalk correction convolution kernels of different layers in the multilayer detector are determined. The interlayer crosstalk correction convolution kernels represent the first mapping relationship between the interlayer crosstalk signal and the projection signal of each layer. The interlayer crosstalk signal in the multilayer detector is estimated based on the projection signals of each layer and the interlayer crosstalk correction convolution kernel, and the projection signals of each layer are corrected based on the interlayer crosstalk signal.

2. The method for correcting interlayer crosstalk in a multilayer detector according to claim 1, characterized in that, The expressions for the projection signals of each layer during the scanning process with an object are as follows: The expression for the projection signals of each layer in the air scan image signal without objects is as follows: In the formula, the subscript i represents the i-th layer detector, and there are a total of N layers of detectors; This represents the projection signal collected by the i-th layer detector, and the object has a total of The composition of the base material is given by the subscript j, which indicates the j-th base material. Indicates the first The equivalent energy spectrum of the layer projection. This indicates the maximum energy of the energy spectrum; Indicates the first The mass decay coefficient of the seed material at energy E Indicates the first Density distribution of the seed material; in the projection signal obtained from actual measurements This represents the main beam projection signal, which is the target signal to be measured during scanning. This indicates the scattered signal caused by Comp scattering or Rayleigh scattering of the scanning rays in the object. and This indicates that the interlayer crosstalk signal caused by the scattering of X-rays within the detector during the absorption process can cause deviations in the target measurement signal.

3. The method for correcting interlayer crosstalk in a multilayer detector according to claim 1, characterized in that, The step of determining the interlayer crosstalk correction convolution kernels for different layers in the multilayer detector based on the structural parameters of the multilayer detector and the target scanning parameters includes: Read the second mapping table of structural parameters, target scanning parameters, and inter-layer crosstalk correction convolution kernel parameters; The second mapping table is queried based on the structural parameters of the multilayer detector and the target scanning parameters to determine the interlayer crosstalk correction convolution kernels of different layers in the multilayer detector.

4. The method for correcting interlayer crosstalk in a multilayer detector according to claim 3, characterized in that, Before reading the second mapping table of structural parameters, target scanning parameters, and inter-layer crosstalk correction convolution kernels, the following steps are also included: Determine the structural parameters of the multilayer detector and the target scanning parameters; A Monte Carlo simulation model is established based on the structural parameters and the target scanning parameters; The interlayer scattering process of the multilayer detector is simulated according to the Monte Carlo simulation model to obtain the interlayer crosstalk signal caused by interlayer scattering in the corresponding layer projection signal. The intensity and shape distribution of crosstalk signals in each layer are obtained using a pencil beam X-ray source, and numerical fitting is performed to obtain the structural parameters of the multilayer detector and the interlayer crosstalk correction convolution kernel parameters under the target scanning parameters. The second mapping table is constructed based on the structural parameters, the target scanning parameters, and the interlayer crosstalk correction convolution kernel parameters.

5. The method for correcting interlayer crosstalk in a multilayer detector according to claim 1, characterized in that, The step of estimating the inter-layer crosstalk signal corresponding to each layer projection signal based on the projection signals of each layer and the inter-layer crosstalk correction convolution kernel includes: Read the projection signals of each layer and the inter-layer crosstalk correction convolution kernel; The inter-layer crosstalk signal corresponding to the projection signals of each layer is estimated by convolving the projection signals of each layer and the inter-layer crosstalk correction convolution kernel.

6. The method for correcting interlayer crosstalk in a multilayer detector according to claim 1, characterized in that, The step of estimating the interlayer crosstalk signal in the multilayer detector based on the projection signals of each layer and the interlayer crosstalk correction convolution kernel, and correcting the projection signals of each layer based on the interlayer crosstalk signal, includes: The corrected projection signals of each layer are obtained by subtracting the interlayer crosstalk signal from the projection signals of each layer corresponding to the layer.

7. The method for correcting interlayer crosstalk in a multilayer detector according to claim 1, characterized in that, After correcting the interlayer crosstalk of the projection signals of each layer according to the interlayer crosstalk signal and the interlayer crosstalk correction convolution kernel, the method further includes: The energy spectrum image is reconstructed based on the projection signals of each layer after signal crosstalk correction.

8. A multilayer detector interlayer signal crosstalk correction device, characterized in that, include: The acquisition module is used to acquire the projection signals of each layer collected by the multilayer detector under the target scanning parameters; The determination module is used to determine the interlayer crosstalk correction convolution kernels of different layers in the multilayer detector based on the structural parameters of the multilayer detector and the target scanning parameters. The interlayer crosstalk correction convolution kernels represent the first mapping relationship between the interlayer crosstalk signal and the projection signal of each layer. The correction module is used to estimate the interlayer crosstalk signal in the multilayer detector based on the projection signals of each layer and the interlayer crosstalk correction convolution kernel, and to correct the projection signals of each layer based on the interlayer crosstalk signal.

9. An electronic device, characterized in that, include: The memory, the processor, and the computer program stored in the memory and executable on the processor, the processor executing the program to implement the multilayer detector interlayer signal crosstalk correction method according to any one of claims 1-7.

10. A computer-readable storage medium having a computer program or instructions stored thereon, characterized in that, When the computer program or instructions are executed, they implement the multilayer detector interlayer signal crosstalk correction method according to any one of claims 1-7.

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