Detection method and system for detecting installation state of detection equipment, and storage medium

Abstract

The invention discloses a detection method for detecting the installation state of equipment. The detection method comprises the following steps: starting the detection equipment, setting a first time window and a first energy window, carrying out external-radiation-source-free scanning for a first preset time, obtaining single event counts and coincidence event counts of all detectors according to data obtained by the external-radiation-source-free scanning, and sending the single event counts and the coincidence event counts to the detection equipment; judging whether the connection state of the corresponding detector is normal or not according to the single event count and the coincidence event count; if the connection states of all the detectors are normal, a radiation source capable of penetrating through the axial view field of the detection equipment is scanned, whether the installation sequence of the detectors is correct or not is determined according to data obtained through scanning, and the detection equipment is composed of all the detectors. According to the invention, the installation sequence of the detectors can be automatically detected, problem points can be directly found out, manual checking one by one is replaced, and the detection efficiency is high.

Description

Technical Field

[0001] The present application relates to the field of PET system integration, and in particular, to a detection method, system, storage medium and computer program product for detecting the installation status of a device. Background Art

[0002] PET (Positron Emission Tomography) is one of the most advanced molecular imaging technologies currently available. It reconstructs images by detecting coincidence events corresponding to the annihilation of positrons and electrons in the object being measured.

[0003] PET includes a detection device consisting of multiple detectors and some necessary electronic devices and other structures. The number of detectors is generally large. For example, an existing detection device includes three groups of 48 detectors. During assembly, all detectors must be wired. Due to the large number of detectors, it is inevitable that there will be problems such as detector wiring errors or incorrect detector installation order. Once an installation error occurs, it will directly affect the results of image reconstruction, so the installation status needs to be detected. The existing detection method is generally to start scanning after installation is completed, and judge whether the installation status is normal based on the quality of the image. If it is not normal, manual reverse deduction is required to find out the problem. In the process, the detectors need to be manually checked one by one, and the detection efficiency is very low.

[0004] The content of the background technology description is only for facilitating understanding of the relevant technology in this field and is not regarded as an admission of the prior art. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a detection method, system, storage medium and computer program product for detecting the installation status of a device.

[0006] In a first aspect, a method for detecting the installation status of a detection device is provided, wherein the detection method is used to detect the installation status of the detector after the detector is installed, and the detection method comprises: S10: Turn on the detection device, set a first time window and a first energy window, perform a scan without an external radiation source for a first predetermined time, obtain a single event count and a coincidence event count of each detector according to data obtained by the scan without an external radiation source, and determine whether the connection status of the corresponding detector is normal according to the single event count and the coincidence event count; S20: If the connection status of all detectors is normal, scan the radiation source that can penetrate the axial field of view of the detection device, and determine whether the installation order of the detectors is correct based on the scanned data, the detection device including all the detectors.

[0007] According to an embodiment of the present application, judging whether the connection state of the corresponding detector is normal according to the single event count and the coincidence event count includes: If all detection channels of a detector have neither single event count nor coincidence event count, it indicates that the wiring and / or communication of the detector is suspected to be abnormal; If any one or more detection channels of a detector have single event counts, but all detection channels do not have coincidence event counts, it indicates that the clock line of the detector is suspected to be abnormal.

[0008] According to one embodiment of the present application, the detection method further includes: After indicating that the wiring and / or communication of the detector is suspected to be abnormal, check the interface of the corresponding detector and / or replace the wiring of the detector; After indicating that the clock line of the detector is suspected to be abnormal, check the clock line interface of the corresponding detector and / or replace the wiring of the detector; After checking the connection status of the wiring of the detector and / or replacing the interface of the detector, checking the connection status of the clock line of the detector and / or replacing the wiring of the detector, S10 is performed again until the connection status of all detectors is normal.

[0009] According to an embodiment of the present application, scanning the radiation source that passes through the axial field of view of the detector, and determining whether the installation order of the detector is correct according to the data obtained by the scanning, includes: Using a radiation source that penetrates the axial field of view of the detector, setting a second time window and a second energy window, performing a scan for a second predetermined time, and obtaining mich data according to the scanned data; Plot the mich data to obtain a mich curve graph; If the curve of the mich curve diagram is continuous, it is determined that the installation sequence of the detectors is correct; otherwise, it is determined that the installation sequence of the detectors is wrong.

[0010] According to one embodiment of the present application, the detection method further includes: If the installation sequence of the detectors is wrong, the numbers of the detectors with the wrong installation sequence are obtained according to the coordinates of the mich curve diagram.

[0011] According to an embodiment of the present application, obtaining the number of the detector with the wrong installation order according to the coordinates of the mich curve graph includes: According to the coordinates of the mich curve diagram, the corresponding response line number is obtained, and according to the response line number, the two detector numbers corresponding to the two ends thereof are obtained.

[0012] According to an embodiment of the present application, after obtaining the numbers of the detectors with incorrect installation order, the detection method further includes: If the number of the detector does not correspond to its position, the numbers of all detectors are reset.

[0013] According to one embodiment of the present application, the detection method is also used for routine detection of detection equipment, and the detection method includes: A third time window and a third energy window are set, and a scan without an external radiation source is performed for a third predetermined time. The single event count and the coincidence event count of each detector are obtained based on the data obtained by the scan without an external radiation source, and whether the connection status of the corresponding detector is normal is determined based on the single event count and the coincidence event count.

[0014] According to one embodiment of the present application, the detection method further includes: When the connection status of the detector is abnormal, the ratio of all detection channels with abnormal connection status to the total number of detection channels is counted; If the ratio value exceeds a preset threshold, it is determined that the detection device is abnormal and cannot work normally; Otherwise, it is determined that the detection device is normal and can work normally.

[0015] In a second aspect of the present application, a detection system for detecting the installation status of a detection device is provided, wherein the detection system is used to detect the installation status of the detector after the detector is installed, and the detection system comprises: A connection status detection module is configured to perform a first predetermined time period of no external radiation source scanning according to a set first time window and a first energy window, obtain a single event count and a coincidence event count of each detector according to data obtained by the no external radiation source scanning, and determine whether the connection status of the corresponding detector is normal according to the single event count and the coincidence event count; The installation sequence detection module is configured to collect and process the scanning data of the detection equipment in the presence of an external radiation source to determine whether the installation sequence of the detectors is correct, and the detection equipment includes all the detectors.

[0016] According to one embodiment of the present application, the connection status detection module is configured to: If all detection channels of a detector have neither single event count nor coincidence event count, it indicates that the wiring and / or communication of the corresponding detector is suspected to be abnormal; If any one or more detection channels of a detector have a single event count, but all detection channels do not have a coincidence event count, it indicates that the clock line of the corresponding detector is suspected to be abnormal.

[0017] According to one embodiment of the present application, the installation sequence detection module is configured to: According to the set second time window and second energy window, scanning is performed for a second predetermined time, and mich data is obtained according to the scanned data; Plot the mich data to obtain a mich curve graph; If the curve of the mich curve diagram is continuous, it is determined that the installation sequence of the detectors is correct; otherwise, it is determined that the installation sequence of the detectors is wrong.

[0018] According to one embodiment of the present application, the detection system further includes a reset module configured to reset the numbers of all detectors when the numbers of the detectors do not correspond to their positions.

[0019] According to one embodiment of the present application, the connection status detection module is also used for daily detection of the detection device and is configured to: According to the set third time window and third energy window, a scan without an external radiation source is performed for a third predetermined time, and a single event count and a coincidence event count of each detector are obtained based on the data obtained by the scan without an external radiation source. According to the single event count and the coincidence event count, it is judged whether the connection status of the corresponding detector is normal.

[0020] According to one embodiment of the present application, the connection status detection module is further configured to: When the connection status of the detector is abnormal, the ratio of all detection channels with abnormal connection status to the total number of detection channels is counted; If the ratio value exceeds a preset threshold, it is determined that the detection device is abnormal and cannot work normally; Otherwise, it is determined that the detection device is normal and can work normally.

[0021] According to a third aspect of the present application, a storage medium is provided, wherein the storage medium stores a computer program, wherein the computer program is configured to implement the detection method for detecting the installation status of a detection device according to the first aspect when executed.

[0022] According to a fourth aspect of the present application, a computer program product is provided, comprising a computer program or instructions, which, when executed by a processor, implements the detection method for detecting the installation status of a detection device according to the first aspect.

[0023] The detection method, system, storage medium and computer program product for detecting the installation status of the detection device provided in the embodiments of the present application can automatically detect the installation order of the detectors after the installation is completed, and directly find the problem points, replacing manual inspection one by one, with high detection efficiency, and can assist the detector installation process. In addition, the present application can also automatically detect the interface stability of each line of each detector in the detection device, whether each line is damaged, etc. in daily use, and find problems in time.

[0024] The optional features and other effects of the embodiments of the present application are partially described below, and partially can be understood by reading this document. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The embodiments of the present application are described in detail with reference to the accompanying drawings. The elements shown are not limited by the proportions shown in the accompanying drawings. The same or similar reference numerals in the accompanying drawings represent the same or similar elements, wherein: Figure 1 is a schematic flow chart of a detection method for detecting the installation status of a detection device according to an embodiment of the present application; Figure 2 A schematic diagram of a detection channel formed by data obtained after performing an empty scan on a detection device with an abnormal connection status according to the detection method provided in an embodiment of the present application; Figure 3 A schematic diagram of a detection channel formed by data obtained after performing an empty scan on a detection device in a normal connection state according to the detection method provided in an embodiment of the present application; Figure 4 is another schematic flow chart of a detection method for detecting the installation status of a detection device according to an embodiment of the present application; Figure 5 A mich diagram obtained according to the detection method for detecting the installation status of a detection device according to an embodiment of the present application; Figure 6 Another mich diagram obtained according to the detection method for detecting the installation status of a detection device according to an embodiment of the present application; Figure 7 It is a framework diagram of a detection system for detecting the installation status of a device according to an embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0027] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on another element or there can also be a centered element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there may be a centered element at the same time. The terms "vertical", "horizontal", "left", "right", "top", "bottom", "upper", "lower" and similar expressions used herein are only for the purpose of illustration and are not limited to practical applications. The described features, structures or characteristics can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided so as to give a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical solution of the present application can be practiced without one or more of these specific details, or other modes, components, materials, devices or operations can be adopted. In these cases, known structures, methods, devices, implementations, materials or operations will not be shown or described in detail.

[0028] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0029] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The term "and / or" or "and / or" includes any and all combinations of one or more related listed items.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0031] Some preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be noted that the following description is for illustrative purposes and is not intended to limit the scope of protection of the present application.

[0032] In modern medical imaging technology, positron emission tomography (PET) is an important molecular imaging technology that can be used for early auxiliary diagnosis of diseases and evaluation of therapeutic effects. The basic principle of PET is coincidence detection: a radioactive tracer is injected into the body of the subject, and the radioactive tracer decays in the subject to produce positrons. The positrons combine and annihilate with negative electrons in the body, and then produce a pair of gamma rays with the same energy but opposite flight directions. By detecting a large number of gamma rays and matching the coincidence data from the same annihilation event, images reflecting the physiological and biochemical changes inside the subject are generated through image reconstruction.

[0033] In order to obtain an accurate reconstructed image, it is necessary to ensure that the installation status of the detection equipment is normal, and there should be no unstable interface connection that leads to abnormal power supply or data transmission, no wiring damage, and no wrong detector installation position, etc. As described in the above background technology, in the technology known to the inventor, the installation status of the detectors is manually checked one by one, and the detection efficiency is very low.

[0034] Therefore, how to automatically detect the installation status of the detection equipment is an important issue currently faced in the PET installation process.

[0035] Figure 1 A schematic flow chart of a detection method for detecting the installation status of a device provided in an embodiment of the present application. Figure 1 The detection method for detecting the installation status of the detection device proposed in this application is used to detect the installation status of the detector after the detector is installed. The detection device can be a ring-shaped PET, an arc-shaped PET, or a flat PET. The detection method includes: Step S10: Turn on the detection device, set a first time window and a first energy window, perform a scan without an external radiation source for a first predetermined time, obtain a single event count and a coincidence event count of each detector based on data obtained by the scan without an external radiation source, and determine whether the connection status of the corresponding detector is normal based on the single event count and the coincidence event count.

[0036] The connection status includes the stability of the connection interface between the detector and the communication line, power line, clock line, etc., whether the communication line, power line, clock line and other lines involved in the detector are damaged, etc.

[0037] Step S10 is performed after all detectors are wired and before the housing is installed. At this point, the core of the detection equipment is basically connected and scanning can be performed.

[0038] To facilitate those skilled in the art to more clearly understand the present application, the following briefly describes single events and coincidence events. Each detector includes several detection channels. After a high-energy particle (for example, a gamma photon) enters a detection channel, energy deposition will be generated on the detection channel. The photoelectric conversion device coupled to the detection channel will generate a scintillation pulse, and this process is called a single event. Ideally, after a gamma photon enters the detection channel, the detection device can detect an energy event and a time event. Under normal circumstances, a pair of gamma photons with the same energy and opposite flight directions are generated after the annihilation of the positron. Therefore, two detection channels on the same straight line will detect two single events respectively, and these two single events constitute a coincidence event. But in fact, Compton scattering may occur during the flight of gamma photons. The energy of gamma photons will change, and the direction will shift, resulting in energy deposition on multiple detection channels, and then outputting multiple scintillation pulses. In other words, after a gamma photon is captured by the detector, a single event may occur on multiple detection channels. Therefore, it is necessary to perform coincidence correction on the single event to find the corrected coincidence event. The single event count and coincidence event count of each detector can be obtained based on the data obtained by scanning without an external radiation source. Existing technologies can be used for this purpose, which will not be described in detail here due to space limitations.

[0039] The scanning without external radiation source is to perform empty scanning without placing radiation source in the detection area of ​​the detection device. Since scintillation crystals are often made of lutetium yttrium silicate, the yttrium therein has a radiation background and emits beta rays and gamma rays, the peak values ​​of which are 307keV and 202keV respectively. In the case of empty scanning, single events and coincidence events can also be obtained, and these data are sufficient to judge whether the connection status of the detector is normal. Therefore, scanning without external radiation source is performed in step S10, which can greatly reduce costs.

[0040] like Figure 2, which shows a schematic diagram of a detection channel formed by data obtained after an empty scan of a detection device, the detection device includes three detection rings, each detection ring includes 48 detectors. All single event count data and all coincidence event count data are sorted separately, and then the numerical values ​​are associated with the grayscale value. The single event counts displayed by all detection channels in the same detector are normalized to form a generally gray color block, and the coincidence event counts displayed by all detection channels in the same detector are also normalized to form a generally gray color block. The 1st to 3rd rows represent the single event counts of all detection channels of all detectors, and the 4th to 6th rows represent the coincidence event counts of all detection channels of all detectors. In the 1st to 3rd rows, the position with a red dot represents that the detection channel has no single event count, and the position with a black dot or block represents that the single event count of the detection channel or the sub-card is relatively small, and a sub-card includes 6×6 detection channels. In the 4th to 6th rows, the position with a red dot represents that the detection channel has no coincidence event count, and the position with a black dot or block represents that the coincidence event count of the detection channel or the sub-card is relatively small. Red blocks indicate that the detector has neither single event counts nor coincidence event counts.

[0041] Among them, the first time window can be any range within 20ns, preferably within 5ns, the first energy window can be any range within 2000keV, preferably within 1000keV, and the first predetermined time can be any range or point value within 10 minutes, preferably 1 minute.

[0042] In one example of the present application, if all detection channels of a detector have neither single event counts nor coincidence event counts, it indicates that the wiring and / or communication of the corresponding detector is suspected to be abnormal, such as Figure 2, the detector 20 has abnormal wiring, abnormal communication, or both abnormalities. In this case, it is necessary to remind the user in a striking manner, for example, the indicator light on the abnormal detector is highlighted, or the abnormal detector number is broadcast, so that the user can check the interface of the corresponding detector and / or replace the wiring of the detector. It can be judged whether the interface is normal by checking whether the network port indicator light is on, and the communication can be judged whether the communication is normal by sending a query command through the software based on whether the detector number can be queried; if any one or more detection channels of a detector have a single event count, but there is no matching event count, it indicates that the clock line of the corresponding detector is suspected to be abnormal. In this case, it is also necessary to remind the user in a striking manner, for example, the indicator light of the abnormal detector is highlighted, or the abnormal detector number is broadcast, so that the user can check the connection status of the clock line of the corresponding detector and / or replace the wiring of the detector. After the inspection is completed, step S10 is performed again to ensure that the connection status of all detectors is normal. It should be noted that when the detector connection status is abnormal, no matter the interface is unstable or the wiring is damaged, all detection channels of the detector cannot detect a single event. As long as any detection channel detects a matching event, the connection status of the detector can be considered normal. Figure 3 A normalized display diagram showing that the connection status of the detectors is normal.

[0043] When all detectors are connected normally, it can be considered that all detectors can perform scanning work, but if the detector installation order is wrong, it will directly affect the quality of the reconstructed image, and in severe cases, the image will not match the actual situation. For example, the detector numbered 1 should be installed at position 1. After the photon event occurs, it is deposited in the scintillation crystal. The connection line of the two detectors that detect the photon event at the same time forms a response line. In TOF-PET, the time difference is derived according to the distance between the photon and the two detectors, and then the deposition position of the photon in the scintillation crystal is confirmed, and the lesion position is finally determined and reflected in the image. If the detector numbered 1 is installed at position 10, the detector 1 recorded by the system should be at position 1, but the response line is obtained based on position 10, which will inevitably lead to the wrong lesion position displayed in the image. Therefore, it is necessary to detect whether the installation order of the detectors is correct. The following step S20 is an example of detecting whether the detector installation order is correct provided by this application.

[0044] Step S20: If the connection status of all detectors is normal, scan the radiation source that can penetrate the axial field of view of the detection device, and determine whether the installation order of the detectors is correct based on the scanned data, and the detection device includes all the detectors.

[0045] Different from step S10, step S20 is an active state scan, and the radiation source used is capable of observing the axial field of view of the detection device, which can be a line source, a shell source or a prosthesis injected with a radiation source. The axial direction refers to the direction perpendicular to the plane where the ring formed by the detector is located.

[0046] Specifically, in one example of the present application, reference Figure 4 , step S20 may include the following specific steps: Step S21: using a radiation source that penetrates the axial field of view of the detector, setting a second time window and a second energy window, performing a scan for a second predetermined time, and obtaining mich data according to the scanned data; Among them, the second time window can be any range within 20ns, preferably within 5ns, the second energy window can be any range within 2000keV, preferably within 1000keV, and the second predetermined time can be any range or point value within 10 minutes, preferably 1 minute.

[0047] The collected gamma photon data are matched according to a certain time window, energy window and position window, and after matching, several gamma photon pairs are obtained. A gamma photon pair is connected to form a response line, and several response lines are arranged and combined to obtain mich data. For example, the response lines located in the same crystal ring are numbered 0, 1...10, and the response lines located in another crystal ring are numbered 33, 34...43. Events with the same LOR number are accumulated to obtain the final mich data.

[0048] Step S22: Plot the mich data to obtain a mich curve graph; In one example, the above-mentioned response lines are arranged and combined to form a three-dimensional array [bin, view, slice]. In one example, it is assumed that a crystal ring includes 11 crystal strips, which are numbered 0, 1...10, respectively. The number of rotations from the crystal numbered 0 to the crystal numbered 11 is view, and the slice is bin×view, which represents the number of all response lines. Each point on the array represents a response line, and the value of each point represents the count on this response line. The three-dimensional array is displayed as an image, such as Figure 5 and Figure 6 , and get a mich curve.

[0049] Step S23: determining whether the curve of the mich curve graph is continuous; Step S24: if the curve of the mich curve diagram is continuous, it is determined that the installation order of the detectors is correct; like Figure 5 As shown, the Mich curve is continuous, which indicates that the installation sequence of the detectors is correct.

[0050] Step S25: Otherwise, it is determined that the installation order of the detectors is wrong.

[0051] like Figure 6 As shown, the mich curve is discontinuous, which indicates that the detectors are installed in the wrong order.

[0052] Furthermore, in order to adjust the detectors with wrong installation order, when it is determined that the installation order of the detectors is wrong, the detection method further includes: According to the coordinates of the mich curve diagram, the numbers of the detectors with wrong installation sequence are obtained.

[0053] Furthermore, according to the coordinates of the mich curve diagram, the corresponding response line number is obtained, and according to the response line number, two detector numbers corresponding to the two ends thereof are obtained.

[0054] As mentioned above, in the preceding step, each detector is numbered, and the number of each detector and the corresponding position are recorded.

[0055] After obtaining the number of the detector, the system can determine whether the number of the detector corresponds to its position based on the recorded correspondence between the number of the detector and the position, or the determination can be made manually.

[0056] When the system automatically determines whether the number corresponds to its position, if it does not correspond, the system directly resets the numbers of all detectors.

[0057] When manual judgment is adopted to determine whether the number corresponds to its position, the system is in a standby state, and the numbers of all detectors are reset when a manual reset command is received.

[0058] Whether the system determines the correspondence between the detector numbers and their positions or it is determined manually, all detector numbers are reset when there is a mismatch, without the need to dismantle and reinstall all detectors, which greatly reduces the workload.

[0059] like Figure 6 When the detector installation order shown is wrong, when manual judgment is used, the corresponding software such as MATLAB can be used to open the MICH intermediate layer image, and the position coordinates of the discontinuous curves in the image can be found. For example, the coordinates are (173, 169) and (214, 159), and then the coordinate values ​​are input into the MATLAB function or other existing tools to obtain the response line number of the position, thereby obtaining the two detectors at both ends, and then check whether the detector installation position is correct.

[0060] The detection method provided in this application can be used to detect the installation status of the detection device after the detector is installed and before it is officially put into use, and can also be used for daily detection of the detection device. During the use of the detection device, the line interface may become loose or the connecting line may become aged and damaged. Therefore, daily detection is required. Specifically, when performing daily detection, the detection method includes: A third time window and a third energy window are set, and a scan without an external radiation source is performed for a third predetermined time. The single event count and the coincidence event count of each detector are obtained based on the data obtained by the scan without an external radiation source, and whether the connection status of the corresponding detector is normal is determined based on the single event count and the coincidence event count.

[0061] Since the radiation source is expensive, and as mentioned above, the yttrium in the lutetium yttrium silicate scintillation crystal has a radiation background, which will emit beta rays and gamma rays, and the single event and coincident event data are sufficient to determine whether the connection status of the detector is normal, therefore, scanning without an external radiation source is also used in daily detection.

[0062] Furthermore, unlike the detection after installation, in daily detection, since the equipment has been installed, the manpower and material resources consumed in disassembly are very high. Therefore, on the basis of ensuring the image quality, there is a certain tolerance for abnormal connection status of the detector. Specifically, in daily detection, the detection method also includes: When the connection status of the detector is abnormal, the ratio of all detection channels with abnormal connection status to the total number of detection channels is counted; If the ratio value exceeds a preset threshold, it is determined that the detection device is abnormal and cannot detect the object to be detected; Otherwise, it is determined that the detection device is normal and can perform the detection of the object to be tested.

[0063] The preset threshold value may be any value less than 15%.

[0064] Among them, the third time window can be any range within 20ns, preferably within 5ns, the third energy window can be any range within 2000keV, preferably within 1000keV, and the third predetermined time can be any range or point value within 10 minutes, preferably 1 minute.

[0065] It is understandable that after the installation is completed and the above-mentioned sequence correction is performed, the sequence of the detectors is clear and will not change during use. Therefore, there is no need to check the installation sequence of the detectors in daily inspections.

[0066] The detection method for the installation status of the detection equipment provided in the present application can automatically detect the interface stability of each line of each detector in the detection equipment, whether each line is damaged, etc. after the installation is completed and in daily use. It can also automatically detect the installation order of the detectors after the installation is completed, and directly find out the problem points, instead of manually checking one by one. The detection efficiency is high, it can assist the detector installation process, and can promptly detect problems in daily use.

[0067] Corresponding to the above-mentioned detection method for detecting the installation status of a device, the embodiment of the present application also provides a detection system for detecting the installation status of a device. Figure 7 As shown, the detection system 700 for detecting the installation status of a device provided in the present application generally includes: a connection status detection module 710 and an installation sequence detection module 720 .

[0068] Specifically, the connection status detection module 710 performs a first predetermined time scan without an external source according to the set first time window and first energy window, obtains the single event count and the coincidence event count of each detector according to the data obtained by the scan without an external source, and judges whether the connection status of the corresponding detector is normal according to the single event count and the coincidence event count. Among them, the first time window, the first energy window and the first predetermined time can be artificially set in the system. The first time window can be any range within 20ns, preferably within 5ns, the first energy window can be any range within 2000keV, preferably within 1000keV, and the first predetermined time can be any range or point value within 10 minutes, preferably 1 minute.

[0069] The description of single event, coincidence event and scanning without external radiation source is described in the above method section and will not be repeated here.

[0070] In one embodiment, the detection device includes three detection rings, each detection ring includes 48 detectors, such as Figure 2As shown. All single event count data and coincident event count information are sorted separately, and then the numerical size is associated with the grayscale value. The normalized single event counts of all detection channels in the same detector form a generally gray block, and the normalized coincident event counts of all detection channels in the same detector also form a generally gray block. Rows 1 to 3 represent the single event counts of all detection channels of all detectors, and rows 4 to 6 represent the coincident event counts of all detection channels of all detectors. In rows 1 to 3, the position with a red dot represents that the detection channel has no single event count, and the position with a black dot or block represents that the single event count of the detection channel or sub-card is relatively small, and a sub-card includes 6×6 detection channels. In rows 4 to 6, the position with a red dot represents that the detection channel has no coincident event count, and the position with a black dot or block represents that the coincident event count of the detection channel or sub-card is relatively small. The red block indicates that the detector has neither a single event count nor a coincident event count.

[0071] In one example of the present application, if all detection channels of a detector have neither single event counts nor coincidence event counts, it indicates that the wiring and / or communication of the corresponding detector is suspected to be abnormal, such as Figure 2 , the detector 20 has wiring abnormalities, communication abnormalities, or both abnormalities. In this case, it is necessary to remind the user in a striking manner, for example, the indicator light on the detector with abnormal control is highlighted, or the number of the abnormal detector is broadcast, so that the user can check the interface of the corresponding detector and / or replace the wiring of the detector; if any one or more detection channels of a detector have a single event count, but there is no matching event count, it indicates that the clock line of the corresponding detector is suspected to be abnormal. In this case, it is also necessary to remind the user in a striking manner, for example, the indicator light on the detector with abnormal control is highlighted, or the number of the abnormal detector is broadcast, so that the user can check the connection status of the clock line of the corresponding detector and / or replace the wiring of the detector. After the inspection is completed, it is necessary to check again through the connection status detection module 710 to ensure that the connection status of all detectors is normal. It should be particularly noted that when the connection status of the detector is abnormal, whether the interface is not tight or the wiring is damaged, all detection channels of the detector cannot detect a single event. As long as any one detection channel detects a matching event, it can be determined that the connection status of the detector is normal. Figure 3 A normalized display diagram showing that the connection status of the detectors is normal.

[0072] When all detectors are connected normally, it can be assumed that all detectors can perform scanning work. However, if the detector installation order is wrong, it will directly affect the quality of the reconstructed image, and in severe cases, the image will not match the actual situation. For example, the detector numbered 1 should be installed at position 1. After the photon event occurs, it is deposited in the scintillation crystal. The connection line of the two detectors that detect the photon event at the same time forms a response line. In TOF-PET, the time difference is deduced according to the distance between the photon and the two detectors, and then the deposition position of the photon in the scintillation crystal is confirmed. The location of the lesion is finally determined and reflected in the image. If the detector numbered 1 is installed at position 10, the system should be at position 1 according to the record, and the response line is obtained accordingly. It is conceivable that the lesion position displayed in the image will inevitably be wrong. Therefore, it is necessary to detect whether the installation order of the detectors is correct.

[0073] The present application detects whether the detector installation sequence is correct through the installation sequence detection module 720. Specifically, the installation sequence detection module 720 collects and processes the scanning data of the detection device in the state of an external radiation source to determine whether the installation sequence of the detector is correct, and the detection device is composed of all the detectors.

[0074] Different from the connection status detection module 710, the installation sequence detection module 720 makes judgments based on data scanned by an external radiation source, and the radiation source used is capable of observing the axial field of view of the detection device, which can be a line source, a shell source, or a prosthesis injected with a radiation source.

[0075] Specifically, in an example of the present application, the installation sequence detection module 720 is configured to: perform a scan for a second predetermined time according to a set second time window and a second energy window, and obtain mich data based on the scanned data; plot the mich data to obtain a mich curve diagram; if the curve of the mich curve diagram is continuous, it is determined that the installation sequence of the detectors is correct, otherwise, it is determined that the installation sequence of the detectors is incorrect.

[0076] Among them, the second time window can be any range within 20ns, preferably within 5ns, the second energy window can be any range within 2000keV, preferably within 1000keV, and the second predetermined time can be any range or point value within 10 minutes, preferably 1 minute.

[0077] The collected gamma photon data is matched according to a certain time window, energy window and position window. After matching, several gamma photon pairs are obtained. A gamma photon pair is connected to form a response line. After arranging and combining several response lines, mich data is obtained. The above response lines are arranged and combined to form a three-dimensional array. Each point on the array represents a response line, and the value of each point represents the count on this response line. The three-dimensional array is displayed as an image, such as Figure 5 and Figure 6 , and get a mich curve.

[0078] Furthermore, the installation sequence detection module 720 can obtain the corresponding response line number according to the coordinates of the mich curve diagram, and obtain the two detector numbers corresponding to the two ends of the response line number according to the response line number.

[0079] After obtaining the number of the detector, the system can determine whether the number of the detector corresponds to its position based on the recorded correspondence between the number of the detector and the position, or the determination can be made manually.

[0080] Specifically, the detection system provided in the present application further includes a reset module 730, which is used to reset the numbers of all detectors when the numbers of the detectors do not correspond to their positions.

[0081] When the system automatically determines whether the number corresponds to its position, if it does not correspond, the reset module 730 directly resets the numbers of all detectors.

[0082] When manual judgment is adopted to determine whether the number corresponds to its position, the reset module 730 is in a standby state, and resets the numbers of all detectors when a manual reset instruction is received.

[0083] Whether the system determines the correspondence between the detector numbers and their positions or it is determined manually, all detector numbers are reset when there is a mismatch, without the need to dismantle and reinstall all detectors, which greatly reduces the workload.

[0084] The detection system provided in the present application can detect the installation status of the detection device after the detector is installed and before it is officially put into use as provided in the above example, and can also be used for daily detection of the detection device. During the use of the detection device, the line interface may become loose or the connecting line may be aged and damaged. Therefore, daily detection is required. Specifically, when performing daily detection, the connection status detection module 710 performs a scan without an external source for a third predetermined time based on the set third time window and third energy window, obtains the single event count and the coincidence event count of each detector based on the data obtained by the scan without an external source, and judges whether the connection status of the corresponding detector is normal based on the single event count and the coincidence event count.

[0085] Since the radiation source is expensive, and as mentioned above, the yttrium in the lutetium yttrium silicate scintillation crystal has a radiation background, which will emit beta rays and gamma rays, and the single event and coincident event data are sufficient to determine whether the connection status of the detector is normal, therefore, scanning without an external radiation source is also used in daily detection.

[0086] Furthermore, unlike the detection after the installation is completed, in daily detection, since the equipment has been installed, the manpower and material resources consumed in disassembling the equipment are very high. Therefore, on the basis of ensuring the image quality, there is a certain tolerance for abnormal connection status of the detector. Specifically, in daily detection, the connection status detection module is configured to: when the connection status of the detector is abnormal, count the proportion of all detection channels with abnormal connection status to the total number of detection channels; if the proportion exceeds the preset threshold, it is determined that the detection device is abnormal and cannot detect the object to be detected; otherwise, it is determined that the detection device is normal and can detect the object to be detected.

[0087] The preset threshold value may be any value less than 15%.

[0088] Among them, the third time window can be any range within 20ns, preferably within 5ns, the third energy window can be any range within 2000keV, preferably within 1000keV, and the third predetermined time can be any range or point value within 10 minutes, preferably 1 minute.

[0089] It is understandable that after the installation is completed and the above-mentioned sequence correction is performed, the sequence of the detectors is clear and will not change during use. Therefore, there is no need to check the installation sequence of the detectors in daily inspections.

[0090] The detection system for the installation status of the detection equipment provided in the present application can automatically detect the interface stability of each line of each detector in the detection equipment, whether each line is damaged, etc. after the installation is completed and in daily use. It can also automatically detect the installation order of the detectors after the installation is completed, and directly find out the problem points, instead of manually checking one by one. The detection efficiency is high, it can assist the detector installation process, and can promptly detect problems in daily use.

[0091] Although not shown, in some embodiments, a computer-readable storage medium is also provided, storing a computer program, which is configured to execute the relevant steps of any method of the embodiment of the present application when it is run. The computer program includes various program modules / units constituting the device according to the embodiment of the present application, and the computer program composed of various program modules / units can realize the functions corresponding to the various steps in the method described in the above embodiment when it is executed. The computer program can also be run on an electronic device as described in the embodiment of the present application.

[0092] It should be understood that the units or modules of the embodiments of the present application can be implemented using semiconductors, especially integrated circuits. For example, the embodiments of the present application may also involve an integrated circuit including any unit or device according to the embodiments of the present application, which falls within the scope of the present application.

[0093] In some embodiments, the system and its modules of the present application can be implemented by hardware, software, or a combination of software and hardware. The hardware part can be implemented using dedicated logic; the software part can be stored in a memory and executed by an appropriate instruction execution system, such as a microprocessor or dedicated design hardware. Those skilled in the art will appreciate that the above methods and systems can be implemented using computer executable instructions and / or included in processor control codes, such as on a carrier medium such as a disk, CD or DVD-ROM, a programmable memory such as a read-only memory (firmware), or a data carrier such as an optical or electronic signal carrier. Such code is provided. The system and its modules of the present application can be implemented not only by hardware circuits such as very large-scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, etc., or programmable hardware devices such as field programmable gate arrays, programmable logic devices, etc., but can also be implemented by software executed by various types of processors, and can also be implemented by a combination of the above hardware circuits and software (e.g., firmware).

[0094] It should be noted that the above description of the modules is only for convenience of description and does not limit the present application to the scope of the embodiments. It is understandable that, after understanding the principle of the system, those skilled in the art may arbitrarily combine the modules or form a subsystem connected to other modules without deviating from the principle.

[0095] The basic concepts have been described herein. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0096] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or multiple times in different positions in the present application does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0097] In addition, it will be understood by those skilled in the art that various aspects of the present application may be illustrated and described by a number of patentable categories or situations, including any new and useful process, machine, product or combination of substances, or any new and useful improvements thereto. Accordingly, various aspects of the present application may be performed entirely by hardware, entirely by software (including firmware, resident software, microcode, etc.), or by a combination of hardware and software. The above hardware or software may be referred to as "data blocks", "modules", "engines", "units", "components" or "systems". In addition, various aspects of the present application may be represented as a computer product located in one or more computer-readable media, which includes computer-readable program code.

[0098] A computer storage medium may include a propagated data signal containing computer program code, for example, in baseband or as part of a carrier wave. The propagated signal may be in a variety of forms, including electromagnetic, optical, etc., or a suitable combination. A computer storage medium may be any computer-readable medium other than a computer-readable storage medium, which can be connected to an instruction execution system, device or apparatus to communicate, propagate or transmit the program for use. The program code on the computer storage medium may be transmitted via any suitable medium, including radio, cable, fiber optic cable, RF, or similar media, or any combination of the above media.

[0099] The computer program codes required for the operation of each part of the present application can be written in any one or more programming languages, including object-oriented programming languages ​​such as Java, Scala, Smalltalk, Eiffel, JADE, Emerald, C++, C#, VB.NET, Python, etc., conventional procedural programming languages ​​such as C language, Visual Basic, Fortran 2003, Perl, COBOL 2002, PHP, ABAP, dynamic programming languages ​​such as Python, Ruby and Groovy, or other programming languages, etc. The program code can be run entirely on the user's computer, or run on the user's computer as an independent software package, or run partially on the user's computer and partially on a remote computer, or run entirely on a remote computer or server. In the latter case, the remote computer can be connected to the user's computer through any network form, such as a local area network (LAN) or a wide area network (WAN), or connected to an external computer (e.g., via the Internet), or in a cloud computing environment, or used as a service such as software as a service (SaaS).

[0100] In addition, unless explicitly stated in the claims, the order of the processing elements and sequences described in this application, the use of alphanumeric characters, or the use of other names are not intended to limit the order of the processes and methods of this application. Although the above disclosure discusses some invention embodiments that are currently considered useful through various examples, it should be understood that such details are only for illustrative purposes, and the attached claims are not limited to the disclosed embodiments. On the contrary, the claims are intended to cover all modifications and equivalent combinations that are consistent with the essence and scope of the embodiments of this application. For example, although the system components described above can be implemented by hardware devices, they can also be implemented only by software solutions, such as installing the described system on an existing server or mobile device.

[0101] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more embodiments of the invention, in the above description of the embodiments of this application, multiple features are sometimes combined into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0102] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used for the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±10%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the method of general digit retention. Although the numerical domains and parameters used to confirm the breadth of the range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0103] Each patent, patent application, patent application disclosure, and other materials, such as articles, books, instructions, publications, documents, etc., cited in this application is hereby incorporated by reference in its entirety. Except for application history documents that are inconsistent with or conflicting with the content of this application, documents that limit the broadest scope of the claims of this application (currently or later attached to this application) are also excluded. It should be noted that if the description, definition, and / or use of terms in the attached materials of this application are inconsistent or conflicting with the content described in this application, the description, definition, and / or use of terms in this application shall prevail.

[0104] Finally, it should be understood that the embodiments described in this application are only used to illustrate the principles of the embodiments of the present application. Other variations may also fall within the scope of the present application. Therefore, as an example and not a limitation, the alternative configurations of the embodiments of the present application may be considered to be consistent with the teachings of the present application. Accordingly, the embodiments of the present application are not limited to the embodiments explicitly introduced and described in the present application.

Claims

1. A detection method for detecting the installation status of a device, characterized in that: The detection method is used to detect the installation status of the detector after the detector is installed, and the detection method includes: S10: Turn on the detection device, set a first time window and a first energy window, perform a scan without an external radiation source for a first predetermined time, obtain a single event count and a coincidence event count of each detector according to data obtained by the scan without an external radiation source, and determine whether the connection status of the corresponding detector is normal according to the single event count and the coincidence event count; S20: If the connection status of all detectors is normal, scan the radiation source that can penetrate the axial field of view of the detection device, and determine whether the installation order of the detectors is correct based on the scanned data, the detection device including all the detectors.

2. The detection method according to claim 1, characterized in that: The determining whether the connection status of the corresponding detector is normal according to the single event count and the coincidence event count includes: If all detection channels of a detector have neither single event count nor coincidence event count, it indicates that the wiring and / or communication of the detector is suspected to be abnormal; If any one or more detection channels of a detector have single event counts, but all detection channels do not have coincidence event counts, it indicates that the clock line of the detector is suspected to be abnormal.

3. The detection method according to claim 2, characterized in that: The detection method further comprises: After indicating that the wiring and / or communication of the detector is suspected to be abnormal, check the interface of the corresponding detector and / or replace the wiring of the detector; After indicating that the clock line of the detector is suspected to be abnormal, check the clock line interface of the corresponding detector and / or replace the wiring of the detector; After checking the connection status of the wiring of the detector and / or replacing the interface of the detector, checking the connection status of the clock line of the detector and / or replacing the wiring of the detector, S10 is performed again until the connection status of all detectors is normal.

4. The detection method according to claim 1, characterized in that: The scanning of the radiation source passing through the axial field of view of the detector and determining whether the installation sequence of the detector is correct according to the data obtained by the scanning include: Using a radiation source that penetrates the axial field of view of the detector, setting a second time window and a second energy window, performing a scan for a second predetermined time, and obtaining mich data according to the scanned data; Plot the mich data to obtain a mich curve graph; If the curve of the mich curve diagram is continuous, it is determined that the installation sequence of the detectors is correct; otherwise, it is determined that the installation sequence of the detectors is wrong.

5. The detection method according to claim 4, characterized in that: The detection method further comprises: If the installation sequence of the detectors is wrong, the numbers of the detectors with the wrong installation sequence are obtained according to the coordinates of the mich curve diagram.

6. The detection method according to claim 5, characterized in that: The step of obtaining the numbers of the detectors with wrong installation order according to the coordinates of the mich curve diagram includes: According to the coordinates of the mich curve diagram, the number of the corresponding response line is obtained, and according to the number of the response line, the numbers of the two detectors corresponding to the two ends of the response line are obtained.

7. The detection method according to claim 5, characterized in that: After obtaining the numbers of the detectors with incorrect installation order, the detection method further includes: If the number of the detector does not correspond to its position, the numbers of all detectors are reset.

8. The detection method according to claim 1, characterized in that: The detection method is also used for routine detection of detection equipment, and the detection method includes: A third time window and a third energy window are set, and a scan without an external radiation source is performed for a third predetermined time. The single event count and the coincidence event count of each detector are obtained based on the data obtained by the scan without an external radiation source, and whether the connection status of the corresponding detector is normal is determined based on the single event count and the coincidence event count.

9. The detection method according to claim 8, characterized in that: The detection method further comprises: When the connection status of the detector is abnormal, the ratio of all detection channels with abnormal connection status to the total number of detection channels is counted; If the ratio value exceeds a preset threshold, it is determined that the detection device is abnormal and cannot work normally; Otherwise, it is determined that the detection device is normal and can work normally.

10. A detection system for detecting the installation status of equipment, characterized in that: The detection system is used to detect the installation status of the detector after the detector is installed. The detection system includes: A connection status detection module is configured to perform a first predetermined time period of no external radiation source scanning according to a set first time window and a first energy window, obtain a single event count and a coincidence event count of each detector according to data obtained by the no external radiation source scanning, and determine whether the connection status of the corresponding detector is normal according to the single event count and the coincidence event count; The installation sequence detection module is configured to collect and process the scanning data of the detection equipment in the presence of an external radiation source to determine whether the installation sequence of the detectors is correct, and the detection equipment includes all the detectors.

11. The detection system according to claim 10, characterized in that: The connection status detection module is configured to: If all detection channels of a detector have neither single event count nor coincidence event count, it indicates that the wiring and / or communication of the corresponding detector is suspected to be abnormal; If any one or more detection channels of a detector have a single event count, but all detection channels do not have a coincidence event count, it indicates that the clock line of the corresponding detector is suspected to be abnormal.

12. The detection system according to claim 10, characterized in that: The installation sequence detection module is configured to: According to the set second time window and second energy window, scanning is performed for a second predetermined time, and mich data is obtained according to the scanned data; Plot the mich data to obtain a mich curve graph; If the curve of the mich curve diagram is continuous, it is determined that the installation sequence of the detectors is correct; otherwise, it is determined that the installation sequence of the detectors is wrong.

13. The detection system according to claim 10, characterized in that: The detection system further comprises a reset module configured to reset the numbers of all detectors when the numbers of the detectors do not correspond to their positions.

14. The detection system according to claim 10, characterized in that: The connection status detection module is also used for routine detection of detection equipment and is configured as follows: According to the set third time window and third energy window, a scan without an external radiation source is performed for a third predetermined time, and a single event count and a coincidence event count of each detector are obtained based on the data obtained by the scan without an external radiation source. According to the single event count and the coincidence event count, it is judged whether the connection status of the corresponding detector is normal.

15. The detection system according to claim 14, characterized in that: The connection status detection module is also configured to: When the connection status of the detector is abnormal, the ratio of all detection channels with abnormal connection status to the total number of detection channels is counted; If the ratio value exceeds a preset threshold, it is determined that the detection device is abnormal and cannot work normally; Otherwise, it is determined that the detection device is normal and can work normally.

16. A storage medium, characterized in that: The storage medium stores a computer program, and the computer program is configured to implement the method for detecting the installation status of the detection device according to any one of claims 1 to 9 when executed.

17. A computer program product, characterized in that It includes a computer program or an instruction, characterized in that when the computer program or the instruction is executed by a processor, it implements the detection method for the installation status of the detection device described in any one of claims 1 to 9.

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