Radiation imaging system and method

Abstract

The present disclosure provides a radiation imaging system and method, and relates to the technical field of radiation detection. The radiation imaging system of the present disclosure comprises: a photodiode detector configured to receive rays from a ray source and generate a first detection signal; a first imaging device connected with the photodiode detector and configured to generate first imaging data according to the first detection signal; a counting detector located on the side of the photodiode detector away from the ray receiving surface and configured to receive rays passing through the photodiode detector and generate a second detection signal; a counting imaging device connected with the counting detector and configured to generate counting imaging data according to the second detection signal; and an image fusion device configured to obtain a first fused image according to the first imaging data and the counting imaging data, thereby improving the radiation detection quality.

Description

[0001] This application is a divisional application of the original application (application date: July 12, 2021, and the invention name: Radiation imaging system and method) with the application number 202110781545.0. TECHNICAL FIELD

[0002] The present disclosure relates to the field of radiation detection technology, in particular to a radiation imaging system and method. BACKGROUND

[0003] SiPM (Silicon Photomultiplier) has excellent performance in many aspects such as small volume, low operating voltage, high measurement accuracy compared with PMT (Photomultiplier Tube) in realizing the conversion of scintillation detector from photons to charges.

[0004] SiPM detector has very good detection efficiency for extremely weak light, and can be applied in high-flux high-energy X-ray imaging systems, has good image effect, and is suitable for counting imaging. SUMMARY

[0005] One purpose of the present disclosure is to improve the quality of radiation imaging.

[0006] According to an aspect of some embodiments of the present disclosure, a radiation imaging system is provided, comprising: a photodiode detector configured to receive rays from a ray source and generate a first detection signal; a first imaging device connected with the photodiode detector and configured to generate first imaging data according to the first detection signal; a counting detector located on the side of the photodiode detector away from the ray receiving surface and configured to receive rays passing through the photodiode detector and generate a second detection signal; a counting imaging device connected with the counting detector and configured to generate counting imaging data according to the second detection signal; and an image fusion device configured to obtain a first fused image according to the first imaging data and the counting imaging data.

[0007] In some embodiments, the counting imaging device comprises: a counting amplifier configured to output a counting detection signal according to the second detection signal and a predetermined counting amplification coefficient; a comparator connected with the counting amplifier and configured to compare the counting detection signal with a predetermined counting threshold value and output a counting signal to a counter in the case that the counting detection signal is greater than the predetermined counting threshold value; a counter configured to count the counting signal output by the comparator and obtain counting data; and a counting imaging device configured to generate counting imaging data according to the counting data.

[0008] In some embodiments, the comparator is configured to compare the counting detection signal with multiple predetermined counting thresholds and output counting signals corresponding to each predetermined counting threshold respectively; the counter is configured to count the counting signals corresponding to each predetermined counting threshold respectively and obtain counting data corresponding to each predetermined counting threshold; the counting imaging device is configured to generate counting imaging data corresponding to each predetermined counting threshold respectively based on the counting data.

[0009] In some embodiments, the radiation imaging system further includes: a material identification device configured to identify the material type of the object passed by the radiation according to the counting imaging data corresponding to each predetermined counting threshold, and output material type information.

[0010] In some embodiments, the radiation imaging system further includes an integral imaging device configured to generate integral imaging data based on the second detection signal; and the image fusion device is further configured to acquire a second fused image based on the counting imaging data and the integral imaging data.

[0011] In some embodiments, the image fusion device is further configured to acquire a third fused image based on the integral imaging data, the first imaging data, and the counting imaging data.

[0012] In some embodiments, the image fusion device is further configured to acquire a fourth fused image based on the integrated imaging data and the first imaging data.

[0013] In some embodiments, the integral imaging device includes: an integrator configured to perform an integration operation based on the second detection signal and output integral data; an analog-to-digital converter configured to generate an integral digital signal based on the integral data; and an integral imaging device configured to generate integral imaging data based on the integral digital signal.

[0014] In some embodiments, the radiation imaging system also includes: a first-stage amplifier, located between the counting detector and the counting imaging device, and between the counting detector and the integrating imaging device, configured to amplify the second detection signal according to a predetermined integral amplification factor, generate an integral detection signal, and output it to the counting imaging device and the integrating imaging device.

[0015] In some embodiments, the counting detector includes a SiPM detector or a CZT (Cadmium Zinc Telluride) detector.

[0016] According to an aspect of some embodiments of the present disclosure, a radiation imaging method is provided, including: receiving, by a photodiode detector, radiation from a radiation source, generating a first detection signal, and generating first imaging data according to the first detection signal; receiving, by a counting detector, the radiation passing through the photodiode detector, generating a second detection signal, and generating counting imaging data according to the second detection signal; and obtaining a first fusion image according to the first imaging data and the counting imaging data.

[0017] In some embodiments, generating the counting imaging data according to the second detection signal includes: obtaining a counting detection signal according to the second detection signal and a predetermined counting amplification coefficient; comparing the counting detection signal with a predetermined counting threshold, and outputting a counting signal in a case where the counting detection signal is greater than the predetermined counting threshold; counting the counting signals to obtain counting data; and generating the counting imaging data according to the counting data.

[0018] In some embodiments, comparing the counting detection signal with the predetermined counting threshold and outputting the counting signal in a case where the counting detection signal is greater than the predetermined counting threshold includes: comparing the counting detection signal with a plurality of predetermined counting thresholds, and respectively outputting counting signals corresponding to each of the predetermined counting thresholds; counting the counting signals to obtain counting data includes: respectively counting the counting signals corresponding to each of the predetermined counting thresholds to obtain counting data corresponding to each of the predetermined counting thresholds; and generating the counting imaging data according to the counting data includes: respectively generating counting imaging data corresponding to each of the predetermined counting thresholds according to the counting data.

[0019] In some embodiments, the radiation imaging method further includes: identifying a material type of a measured object through which the radiation passes according to the counting imaging data corresponding to each of the predetermined counting thresholds, and outputting material type information.

[0020] In some embodiments, the radiation imaging method further includes: generating integral imaging data according to the second detection signal; and obtaining a second fusion image according to the counting imaging data and the integral imaging data.

[0021] In some embodiments, the radiation imaging method further includes: obtaining a third fusion image according to the integral imaging data, the first imaging data, and the counting imaging data.

[0022] In some embodiments, the radiation imaging method further includes: obtaining a fourth fusion image according to the integral imaging data and the first imaging data.

[0023] In some embodiments, generating the integral imaging data according to the second detection signal includes: performing an integration operation according to the second detection signal to output integral data; generating an integral digital signal according to the integral data; and generating the integral imaging data according to the integral digital signal.

[0024] In some embodiments, the radiation imaging method further includes: after the counting detector generates a second detection signal, amplifying the second detection signal through a first-stage amplifier according to a predetermined integral amplification factor to generate an integral detection signal; generating counting imaging data according to the second detection signal includes: amplifying the integral detection signal according to the predetermined counting amplification factor to obtain the counting detection signal so as to generate counting imaging data according to the counting detection signal; and generating integral imaging data according to the second detection signal includes: generating integral imaging data according to the integral detection signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present disclosure. The exemplary embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the drawings:

[0026] Figure 1 Schematic diagrams of some embodiments of the radiation imaging system disclosed herein.

[0027] Figure 2 Schematic diagram of some embodiments of a counting imaging device in a radiation imaging system of the present disclosure.

[0028] Figure 3 Schematic diagrams of some embodiments of an integral imaging device in a radiation imaging system of the present disclosure.

[0029] Figure 4 Schematic diagrams of other embodiments of the radiation imaging system disclosed herein.

[0030] Figure 5 Flowcharts of some embodiments of the radiation imaging method disclosed herein.

[0031] Figure 6 Flowcharts of other embodiments of the radiation imaging method disclosed herein.

[0032] Figure 7 The present invention provides a flow chart of some embodiments of the radiation imaging method according to the present invention, which is based on detection signal imaging using a counting detector. DETAILED DESCRIPTION

[0033] The technical solution of the present disclosure is further described in detail below through the accompanying drawings and examples.

[0034] Since highly sensitive detectors often have a low saturation threshold, when they are directly exposed to radiation with a flux higher than the saturation threshold of the detector, the imaging effect will be reduced.

[0035] Schematic diagrams of some embodiments of the radiation imaging system disclosed herein are as follows Figure 1 shown.

[0036] The PD (Photo-Diode) detector 110 is located on the radiation receiving surface of the radiation imaging system and can generate a first detection signal based on the received radiation. The first imaging device 111 is connected to the PD detector and can generate first imaging data based on the first detection signal.

[0037] The counting detector 120 is located on the side of the PD detector away from the ray receiving surface. During use, it receives rays passing through the photodiode detector and generates a second detection signal. The counting detector refers to a detector whose detection data supports the counting imaging function. In some embodiments, the detection data of the counting detector can also be imaged by methods other than counting imaging, such as integral imaging. In some embodiments, the counting detector can be a SiPM detector or a CZT detector. In some embodiments, the scintillator coupled to the SiPM detector can be a lead tungstate PbWO4 scintillator, which is beneficial to improve the detection density and detection efficiency. The counting imaging device 121 is connected to the counting detector 120 and can generate counting imaging data based on the second detection signal. In some embodiments, the counting imaging data refers to data that is imaged by counting the second detection signal with a predetermined counting threshold and using the counting signal.

[0038] Image fusion device 130 is connected to first imaging device 111 and counting imaging device 121 and is capable of fusing the first imaging data with the counting imaging data to obtain a first fused image. In some embodiments, image fusion technology can be used to fuse the first imaging data with the counting imaging data based on a predetermined first weight ratio to generate the first fused image.

[0039] Such a radiation imaging system can synchronously generate detection data based on PD detectors and detection data based on counting detectors, and fuse the two to improve detection quality. At the same time, under the same initial flux, the occlusion of the PD detector reduces the flux of X-rays reaching the counting detector, thereby reducing the probability of saturation of the counting detector and further improving the detection quality. The effect is particularly obvious in extremely high-flux X-ray detection.

[0040] In some embodiments, as Figure 1 As shown, the radiation imaging system further includes an integral imaging device 122 capable of generating integral imaging data based on the second detection signal generated by the counting detector 120. In some embodiments, the integral imaging data refers to data obtained by integrating the second detection signal and imaging the integrated signal.

[0041] The image fusion device 130 can also be connected to the integral imaging device 122. In some embodiments, the image fusion device 130 can fuse the count imaging data with the integral imaging data to obtain a second fused image. In some embodiments, image fusion technology can be used to fuse the integral imaging data and the count imaging data based on a set second weight ratio to generate the second fused image.

[0042] Such a radiation imaging system can simultaneously generate counting imaging data and integral imaging data based on the detection results of the counting detector, and fuse the two, leveraging the advantages of both counting and integral imaging to improve imaging quality. In some embodiments, the second weight ratio can be dynamically adjusted based on the varying adaptability of counting and integral imaging under different flux conditions. For example, as the flux increases, the weight of the integral imaging data increases, while the weight of the counting imaging data decreases.

[0043] In some embodiments, considering that the integral imaging mode is based on the sum of the photon responses of the counting detectors, while the counting imaging mode is based on the number of photon responses of the counting detectors, and that the two are not in the same dimension, an average response coefficient when converting the number of photons into a photon energy response can be estimated. In some embodiments, based on imaging and imaging data analysis of detection data of a uniform material of a predetermined thickness, the integral response brightness value is compared with the count rate in the counting mode to obtain an average response coefficient. The counting imaging image is multiplied by this coefficient to convert the imaging data of the two modes to the same dimension. The images of the two modes are then fused according to a second weight ratio to obtain a second fused image.

[0044] Such a radiation imaging system can first convert the integrated and counted imaging data into the same dimension and then further fuse them, thereby improving the rationality of image fusion and further improving the accuracy of imaging.

[0045] In some embodiments, the image fusion device 130 can further fuse the integral imaging data, the first imaging data, and the count imaging data to obtain a third fused image, thereby leveraging the advantages of the three to improve imaging quality. In some embodiments, image fusion technology can be used to fuse the first imaging data, the integral imaging data, and the count imaging data based on a set third weight ratio to generate the third fused image.

[0046] In some embodiments, the image fusion device 130 can further fuse the integral imaging data with the first imaging data to obtain a fourth fused image. In some embodiments, image fusion technology can be employed to fuse the first imaging data with the integral imaging data based on a predetermined fourth weight ratio to generate the fourth fused image. Such a radiation imaging system can further enhance the flexibility of image fusion, facilitate providing more fusion solutions, and increase the possibility of obtaining higher-quality imaging data.

[0047] In some embodiments, the weight ratios can be dynamically adjusted based on the signal-to-noise ratio to optimize the imaging effect. In some embodiments, the weight ratios can be dynamically adjusted for different X-ray fluxes.

[0048] In some embodiments, a counting imaging device such as Figure 2 shown.

[0049] The counting amplifier 201 is capable of receiving the second detection signal from the counting detector. In some embodiments, the counting amplifier 201 may directly receive the second detection signal and amplify it using a preset amplification factor. In other embodiments, the second detection signal may be input to the counting amplifier 201 after undergoing a first stage of amplification. The counting amplifier 201 amplifies the received signal according to the preset counting amplification factor and outputs a counting detection signal. In some embodiments, the preset counting amplification factor can be set and adjusted based on the obtained penetration index value.

[0050] The comparator 202 is connected to the counter amplifier 201 and can compare the count detection signal with a predetermined count threshold value. When the count detection signal is greater than the predetermined count threshold value, the comparator 202 outputs a count signal to the counter.

[0051] The counter 203 can count the counting signals output by the comparator to obtain counting data.

[0052] The counting imaging device 204 can generate counting imaging data based on the counting data.

[0053] Such a radiation imaging system can amplify the detection data based on the data accuracy required in the counting imaging process, avoid excessive errors caused by weak signal intensity, and improve signal quality.

[0054] In some embodiments, the counting imaging device can generate multiple counting imaging data for the same second detection signal by setting different predetermined counting thresholds. In some embodiments, the number of preset counting thresholds can be 2, thereby achieving dual-energy counting imaging.

[0055] In some embodiments, the comparator 202 compares the count detection signal with a plurality of different predetermined count thresholds and outputs a count signal corresponding to each predetermined count threshold. In some embodiments, multiple comparators 202 may be provided, each performing a comparison with a predetermined count threshold and outputting a comparison result. In some embodiments, the comparator 202 may be a single-input multiple-output comparator that outputs comparison results with a plurality of different predetermined count thresholds based on the input signal.

[0056] Based on the data output by comparator 202, counter 203 can count the count signals corresponding to each predetermined count threshold and obtain count data corresponding to each predetermined count threshold. In some embodiments, there may be multiple counters 203, each of which performs count processing on one count signal to generate count data. In some embodiments, counter 203 may be a single counter with multiple-input and multiple-output functionality, with one-to-one correspondence between inputs and outputs. Each input receives one count signal, and the counter counts each count signal separately.

[0057] The counting imaging device 204 can generate counting imaging data corresponding to each predetermined counting threshold based on the counting data. In some embodiments, there may be multiple counting imaging devices, each of which can generate counting imaging data based on one channel of counting data. In other embodiments, the counting imaging device 204 has a multiple-input multiple-output (MIMO) function, with one input corresponding to one output. Each input receives one channel of counting data, and the counting imaging device 204 generates an image for each channel of counting data.

[0058] Such a radiation imaging system can simultaneously generate multiple sets of counting imaging data for the same second detection signal, and obtain radiation imaging for different energy bands by setting different counting thresholds, thereby improving the utilization rate of radiation detection signals, facilitating selection from multiple images, and increasing the possibility of obtaining higher quality imaging data.

[0059] In some embodiments, as Figure 2 As shown, the radiation imaging system also includes a material identification device 205. The material identification device 205 can identify the material type of the object being tested based on the count imaging data corresponding to each predetermined count threshold, and output material type information. The same material can have different effects on radiation of different fluxes, while different materials can have different effects on the same flux. For example, in the low-energy region, the photoelectric effect dominates and is strongly correlated with the atomic number of the material being tested; in the mid- and low-energy regions, Compton scattering dominates and is weakly correlated with the atomic number; and the ratio of the attenuation coefficients at these two energies varies monotonically with the atomic number. Therefore, by imaging the detection signals of different energy ranges for the same object being tested, material identification can be achieved. In some embodiments, the corresponding relationships can be pre-stored, such as in a database or relationship table. Based on the pre-stored data, the material identification device 205 analyzes the count imaging data corresponding to different predetermined count thresholds obtained for the same second detection data to determine the material of the object being tested, such as its atomic number.

[0060] Such a radiation imaging system can determine the material type of the object being measured through a single detection, further improving the utilization rate of the detection signal and enhancing the detection accuracy.

[0061] In some embodiments, the integral imaging device may be Figure 3 shown.

[0062] The integrator 301 is connected to a preceding device, such as a counting detector, to obtain a second detection signal, or an amplifier directly connected to the counting detector to obtain an amplified signal. The integrator 301 performs an integration operation on the received signal and outputs integrated data.

[0063] The ADC (Analog to Digital Converter) 302 performs analog-to-digital conversion on the integrated data to generate an integrated digital signal.

[0064] The integral imaging device 303 generates integral imaging data according to the integrated digital signal.

[0065] Such an integral imaging device can perform integral imaging based on the detection results of the counting detector, thereby improving the utilization rate of the second detection signal.

[0066] Schematic diagrams of other embodiments of the radiation imaging system disclosed herein are shown in FIG. Figure 4 shown.

[0067] The PD detector 410, the first imaging device 411, the counting detector 420, the image fusion device 430, the integrating imaging device including an integrator 4231, an ADC 4232, and an integrating imaging device 4233, and the counting imaging device including a counting amplifier 4221, a comparator 4222, a counter 4223, and a counting imaging device 4224 can all be similar to those in the above embodiments. The radiation imaging system also includes a first-stage amplifier 421.

[0068] The primary amplifier 421 is located between the counting detector and the counting imaging device, and between the counting detector and the integrating imaging device. Upon receiving the second detection signal from the counting detector 420, the primary amplifier 421 amplifies the second detection signal according to a predetermined integral amplification factor to generate an integral detection signal, which is then output to the counting imaging device and the integrating imaging device, respectively. The integrating imaging device uses the received integral detection signal for imaging, while the counting imaging device performs secondary amplification of the integral detection signal using the counting amplifier 4221 before performing counting imaging processing.

[0069] Such a radiation imaging system can take into account the different signal strength requirements in integration and counting processing, and adopts a two-stage amplification method for different imaging methods, ensuring the quality of counting and integration imaging; in addition, the two-stage amplification method also avoids the problem of introducing excessive noise when using a single amplifier for high-amplitude amplification, further ensuring imaging quality.

[0070] Flowcharts of some embodiments of the radiation imaging method disclosed herein are as follows: Figure 5 In some embodiments, the radiation imaging method of the present disclosure can be based on any of the radiation imaging systems mentioned above.

[0071] In step 501, a radiation from a radiation source is received by a photodiode detector to generate a first detection signal, and first imaging data is generated according to the first detection signal.

[0072] In step 502 , a counting detector receives radiation that passes through a photodiode detector, generates a second detection signal, and generates counting imaging data according to the second detection signal.

[0073] In some embodiments, due to differences in the deployment positions of the detectors, the first detection signal is generated before the second detection signal. The first imaging data and the counting imaging data may be generated synchronously or asynchronously.

[0074] In step 503, a first fused image is acquired based on the first imaging data and the count imaging data. In some embodiments, an image fusion technique may be used to fuse the first imaging data and the count imaging data based on a set first weight ratio to generate the first fused image.

[0075] Through this method, detection data based on PD detectors and detection data based on counting detectors can be generated synchronously, and the two can be fused to improve the detection quality. At the same time, under the same initial flux, the occlusion of the PD detector reduces the probability of saturation of the counting detector, further improving the detection quality. At the same time, it can also expand the scope of application, especially in extremely high-flux X-ray detection, where the effect of improving detection quality is more obvious.

[0076] Flowcharts of other embodiments of the radiation imaging method disclosed herein are as follows: Figure 6 shown.

[0077] In step 601, a PD detector receives radiation from a radiation source, generates a first detection signal, and generates first imaging data according to the first detection signal.

[0078] In step 602, the radiation passing through the PD detector is received by a counting detector to generate a second detection signal, and counting imaging data and integral imaging data are generated according to the second detection signal.

[0079] In some embodiments, due to differences in the deployment positions of the detectors, the first detection signal is generated before the second detection signal.The first imaging data, the counting imaging data, and the integrated imaging data may be generated synchronously or asynchronously.

[0080] In some embodiments, one or more of steps 603 to 606 may be optionally performed.

[0081] In step 603, a first fused image is acquired based on the first imaging data and the count imaging data. In some embodiments, an image fusion technique may be used to fuse the first imaging data and the count imaging data based on a set first weight ratio to generate the first fused image.

[0082] In step 604, the count imaging data is fused with the integral imaging data to obtain a second fused image. In some embodiments, an image fusion technique can be used to fuse the integral imaging data and the count imaging data based on a set second weight ratio to generate the second fused image.

[0083] In some embodiments, the counting imaging data may be converted into the same dimension as the integral imaging data before fusion is performed to improve the rationality of the fusion.

[0084] In step 605, the integral imaging data, the first imaging data, and the count imaging data are fused to obtain a third fused image, thereby utilizing the advantages of the three to improve imaging quality. In some embodiments, image fusion technology can be used to fuse the first imaging data, the integral imaging data, and the count imaging data based on a set third weight ratio to generate the third fused image.

[0085] In step 606, the integral imaging data and the first imaging data are fused to obtain a fourth fused image. In some embodiments, an image fusion technique may be used to fuse the first imaging data and the integral imaging data based on a set fourth weight ratio to generate the fourth fused image.

[0086] Through this method, multiple imaging data can be obtained in one detection, and multiple fused images can be obtained through different fusion methods, which improves the utilization of detection data and the flexibility of image fusion. More fusion schemes help to increase the possibility of obtaining higher quality imaging data.

[0087] In the radiation imaging method disclosed herein, a flowchart of some embodiments of the process of generating counting imaging data and integral imaging data according to the second detection signal is shown below: Figure 7 shown.

[0088] In step 701 , after the counting detector generates the second detection signal, the second detection signal is amplified by a first-stage amplifier according to a predetermined integral amplification coefficient to generate an integral detection signal, and then steps 712 and 722 are executed.

[0089] In step 712, the counting amplifier amplifies the received integrated detection signal according to a predetermined counting amplification factor and outputs a counting detection signal.

[0090] In step 713, the counting detection signal is compared with a predetermined counting threshold, and a counting signal is output to the MCU when the counting detection signal is greater than the predetermined counting threshold. In some embodiments, the number of predetermined counting thresholds can be 1 or greater than 1, such as two different predetermined counting thresholds.

[0091] In step 714, the counting signal is counted to obtain counting data.

[0092] In step 715 , count imaging data is generated based on the count data.

[0093] In some embodiments, when the number of the predetermined counting threshold is greater than 1, counting imaging data equal to the number of the predetermined counting threshold can be generated, thereby performing material identification and improving detection accuracy.

[0094] In step 722, an integration operation is performed on the integrated detection signal, and integrated data is output.

[0095] In step 723 , analog-to-digital conversion is performed on the integrated data to generate an integrated digital signal.

[0096] In step 724 , integrated imaging data is generated based on the integrated digital signal.

[0097] Through this method, the second detection signal can be provided to different imaging modes using a two-stage amplification method, ensuring the quality of counting and integral imaging; in addition, the two-stage amplification method also avoids the problem of introducing excessive noise when using a single amplifier for high-intensity amplification, further ensuring imaging quality.

[0098] The present disclosure is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present disclosure. It should be understood that each process and / or block in the flowchart and / or block diagram and the combination of processes and / or blocks in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0099] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1The function specified in one or more boxes.

[0100] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0101] The present disclosure has been described in detail so far. To avoid obscuring the concept of the present disclosure, some details known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0102] The methods and apparatus of the present disclosure may be implemented in many ways. For example, the methods and apparatus of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above order of steps for the method is for illustration only, and the steps of the method of the present disclosure are not limited to the order specifically described above, unless otherwise specifically stated. In addition, in some embodiments, the present disclosure may also be implemented as programs recorded in a recording medium, which include machine-readable instructions for implementing the methods according to the present disclosure. Therefore, the present disclosure also covers recording media that store programs for executing the methods according to the present disclosure.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure and not to limit it. Although the present disclosure has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present disclosure can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solutions of the present disclosure, which should all be included in the scope of the technical solutions requested for protection in the present disclosure.

Claims

1. A radiation imaging system, comprising: a counting detector configured to receive radiation passing through the photodiode detector and generate a second detection signal; a first-stage amplifier, located between the counting detector and the counting imaging device, and between the counting detector and the integrating imaging device, configured to amplify the second detection signal according to a predetermined integral amplification factor and output the amplified signal to the counting imaging device and the integrating imaging device; the counting imaging device; the integral imaging device; and Image fusion device; The counting imaging device is configured to amplify the received signal output by the first-stage amplifier according to a predetermined counting amplification factor to generate counting imaging data; The integral imaging device is configured to generate integral imaging data according to the signal output by the first-stage amplifier; The image fusion device is configured to acquire a second fused image based on the counting imaging data and the integral imaging data.

2. The system according to claim 1, wherein: The counting imaging device comprises: a counting amplifier configured to output a counting detection signal according to the second detection signal and a predetermined counting amplification factor; a comparator connected to the counting amplifier and configured to compare the counting detection signal with a predetermined counting threshold, and output a counting signal to a counter when the counting detection signal is greater than the predetermined counting threshold; The counter is configured to count the counting signal output by the comparator to obtain counting data; and The counting imaging device is configured to generate the counting imaging data according to the counting data.

3. The system according to claim 2, wherein: The comparator is configured to compare the counting detection signal with a plurality of the predetermined counting thresholds and output a counting signal corresponding to each of the predetermined counting thresholds respectively; The counter is configured to count the counting signals corresponding to each of the predetermined counting thresholds respectively, and obtain counting data corresponding to each of the predetermined counting thresholds; The counting imaging device is configured to generate the counting imaging data corresponding to each of the predetermined counting thresholds according to the counting data.

4. The system according to claim 3, further comprising: The material identification device is configured to identify the material type of the object under test through which the radiation passes according to the counting imaging data corresponding to each predetermined counting threshold, and output material type information.

5. The system according to claim 1, wherein The integral imaging device comprises: an integrator configured to perform an integration operation according to the signal output by the first-stage amplifier and output integration data; an analog-to-digital converter configured to generate an integrated digital signal based on the integrated data; and The integral imaging device is configured to generate the integral imaging data according to the integrated digital signal.

6. The system according to claim 1, wherein: The counting detector includes a silicon photomultiplier tube SiPM detector or a cadmium zinc telluride CZT detector.

7. A radiation imaging method, comprising: receiving the radiation passing through the photodiode detector by a counting detector to generate a second detection signal; amplifying the second detection signal through a first-stage amplifier according to a predetermined integral amplification factor and outputting the amplified signal; generating integrated imaging data according to the signal output by the first-stage amplifier; amplifying the output of the first-stage amplifier according to a predetermined count amplification factor to generate count imaging data; and A second fused image is acquired according to the integral imaging data and the counting imaging data.

8. The method according to claim 7, wherein: Amplifying the signal output by the first-stage amplifier according to a predetermined count amplification factor to generate count imaging data includes: acquiring a counting detection signal according to the second detection signal and a predetermined counting amplification factor; comparing the counting detection signal with a predetermined counting threshold, and outputting a counting signal if the counting detection signal is greater than the predetermined counting threshold; Counting the counting signals to obtain counting data; and The count imaging data is generated based on the count data.

9. The method according to claim 8, wherein Comparing the counting detection signal with a predetermined counting threshold and outputting a counting signal when the counting detection signal is greater than the predetermined counting threshold comprises: comparing the counting detection signal with a plurality of the predetermined counting thresholds and outputting a counting signal corresponding to each of the predetermined counting thresholds respectively; The counting of the counting signals to obtain the counting data comprises: respectively counting the counting signals corresponding to each of the predetermined counting thresholds to obtain the counting data corresponding to each of the predetermined counting thresholds; Generating the counting imaging data according to the counting data includes: generating the counting imaging data corresponding to each of the predetermined counting thresholds according to the counting data.

10. The method according to claim 9, further comprising: According to the counting imaging data corresponding to each of the predetermined counting thresholds, the material type of the object under test through which the rays pass is identified, and the material type information is output.

Images