Dynamic quality control method for d-spect system

Abstract

The application provides a dynamic quality control method of a D-SPECT system, which comprises the following steps: a plurality of detection units acquire a plurality of scanning data of a radioactive source simulation nuclide within a first time length; the plurality of scanning data are divided into a plurality of first data sets corresponding to different time points according to time information; each scanning data is divided into a plurality of second data sets corresponding to different positions according to spatial information; uniformity and / or resolution of the scanning data are obtained according to the plurality of first data sets; a plurality of time activity curves are obtained according to the plurality of second data sets; and dynamic scanning quality of the D-SPECT system is determined according to the uniformity of the scanning data, the resolution of the scanning data and / or the plurality of time activity curves. The quality control method of the application can evaluate the dynamic scanning quality of the D-SPECT system through the scanning data of the radioactive source simulation nuclide, and can determine whether the D-SPECT system needs further adjustment or whether the requirement for target data is met according to the dynamic scanning quality evaluation result.

Description

Technical Field

[0001] This invention relates to the field of medical imaging technology, and more specifically to a dynamic quality control method for a D-SPECT system. Background Technology

[0002] Single-photon emission computed tomography (SPECT) is an important medical imaging technique. Traditional SPECT quality control measures mainly include intrinsic spatial resolution, homogeneity, planar sensitivity, intrinsic spatial linearity, and rotation center drift. While intrinsic spatial resolution, intrinsic spatial linearity, and rotation center drift are generally relatively stable, homogeneity, energy peak, and resolution are prone to variation. Furthermore, traditional SPECT quality control requires the use of different shapes of 99Tc-labeled emulsions at varying distances from the detector, as well as the replacement of collimators of different shapes. This results in lengthy and cumbersome quality control processes, relatively high radiation doses for quality control operators, and the inability to perform specialized quality control for dynamic cardiac acquisition. Instead, routine quality control is only performed before dynamic cardiac acquisition, which hinders the accurate assessment of the SPECT's performance status prior to acquisition. These factors severely impact the effectiveness of efficient and effective performance control scanning before dynamic cardiac acquisition, consequently affecting the entire acquisition process and the interpretation of clinical imaging results.

[0003] The heart is vital to the human body. As one of the most important organs, it pumps blood through blood vessels to provide the necessary energy for all bodily activities. However, the heart itself also requires a blood supply. If the myocardium itself or the coronary arteries supplying it become diseased, it will severely affect the heart's blood supply function and even endanger life. Among these, heart disease caused by coronary artery stenosis and heart disease caused by microvascular disease are the most fatal. Both of these diseases lead to severe blood supply defects to the myocardium, resulting in serious adverse cardiac events that can be life-threatening. Therefore, monitoring, preventing, and accurately diagnosing the impact of coronary artery stenosis on cardiac blood supply, as well as the presence and extent of microvascular disease affecting myocardial blood supply, are crucial.

[0004] Currently, the most advanced international monitoring, prevention, and diagnostic methods include positron emission tomography (PET) and SPECT (Special Electron Microscopy) for measuring myocardial flow reserve (MFR), also known as coronary flow reserve (CFR). PET requires radioactive isotopes (such as 18F-labeled oxygenated water) produced using a cyclotron, resulting in high costs and short half-lives, making transportation and storage difficult. PET itself is also prohibitively expensive. In contrast, SPECT uses 99Tc-labeled drugs with longer half-lives, making it far superior to PET in terms of cost, transportation, and storage. Furthermore, according to relevant literature, SPECT-measured CFR values ​​show a high correlation and consistency with PET values. Therefore, SPECT for CFR measurement is one of the most recommended non-invasive diagnostic methods in the cardiovascular and nuclear medicine fields both domestically and internationally.

[0005] To ensure the stability of SPECT performance and the accuracy of imaging results during dynamic cardiac acquisition, and to shorten the acquisition time for dynamic cardiac quality control and improve the efficiency of dynamic cardiac quality control, a simple, fast, and more accurate SPECT dynamic cardiac quality control method is needed.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0007] To address the problems in the prior art, the present invention aims to provide a dynamic quality control method for a D-SPECT system. By evaluating the scanning data of the radioactive source simulated nuclide using the D-SPECT system, the dynamic scanning quality of the system can be determined. Based on the dynamic scanning quality evaluation results, it can be determined whether the D-SPECT system needs further adjustment or whether it meets the requirements for the target data.

[0008] Embodiments of the present invention provide a dynamic quality control method for a D-SPECT system, the D-SPECT system comprising an L-shaped tomographic imaging probe with multiple detection units, a radioactive source simulating nuclide, an adjustable fixture, and a processing unit;

[0009] One end of the adjustable clamp is connected to the L-shaped tomographic imaging probe;

[0010] The other end of the adjustable clamp is connected to the radioactive source simulated nuclide;

[0011] The processing unit is connected to the L-shaped tomographic imaging probe and receives photon scanning data of the radioactive source simulated nuclide from the L-shaped tomographic imaging probe.

[0012] The quality control method includes the following steps:

[0013] The multiple detection units acquire multiple scan data of the radioactive source simulated nuclide within a first time period, and each scan data includes time information and spatial information respectively;

[0014] The multiple scan data are divided into multiple first subsets corresponding to different time points according to time information, and / or, each scan data is divided into a second subset corresponding to different locations according to spatial information;

[0015] The uniformity and / or resolution of the scan data are obtained based on multiple first subsets of data, and / or multiple time-activity curves are obtained based on multiple second subsets of data;

[0016] The dynamic scan quality of the D-SPECT system is determined based on the uniformity of the scan data, the resolution of the scan data, and / or multiple time-activity curves.

[0017] According to some examples of the present invention, the distance between the radioactive source simulated nuclide and the center position at the bend of the L-shaped tomographic probe can be adjusted by the adjustable clamp.

[0018] According to some examples of the present invention, before the plurality of probes acquire multiple scan data of the radioactive source simulated nuclide within a first time period, the quality control method further includes the following steps:

[0019] Adjust the distance between the simulated radionuclide from the radioactive source and the center position at the bend of the L-shaped tomographic probe according to the application parameters.

[0020] According to some examples of the present invention, the application parameters are determined based on the target scanning object.

[0021] According to some examples of the present invention, the distance between the simulated radionuclide of the radioactive source and the center position of the angle between the distance and the L-shaped tomographic imaging probe ranges from 10 cm to 20 cm.

[0022] According to some examples of the present invention, after the step of obtaining multiple time-activity curves based on multiple second subsets of data, the method further includes:

[0023] The decay rate is obtained from the time-activity curve.

[0024] According to some examples of the present invention, obtaining the uniformity and / or resolution of the scan data based on a plurality of first subsets includes the following steps:

[0025] Based on the first subset of data at each time point, a panoramic view of the simulated radionuclide at the corresponding time point is obtained;

[0026] The uniformity and / or resolution of the scan data at each time point are obtained from the panoramic images at each time point.

[0027] According to some examples of the present invention, determining the dynamic scan quality of the D-SPECT system based on the uniformity of the scan data, the resolution of the scan data, and / or multiple time-activity curves includes the following steps:

[0028] Determine whether the uniformity is greater than a first threshold;

[0029] Determine whether the resolution is greater than the second threshold; and / or

[0030] Determine whether the absolute value of the difference between the attenuation rate and the attenuation rate of the simulated radionuclide from the radioactive source is greater than a third threshold.

[0031] If one or more of the above conditions are met, the dynamic scanning quality of the D-SPECT system is considered not to meet the set requirements.

[0032] According to some examples of the invention, the radioactive source simulating the nuclide is Co-57, and the first duration is 390 seconds.

[0033] The dynamic quality control method of the D-SPECT system of the present invention evaluates the dynamic scanning quality of the system by scanning data of radioactive source simulated nuclides. Based on the dynamic scanning quality evaluation results, it can be determined whether the D-SPECT system needs further adjustment or whether it meets the requirements for target data. The above method is simple, fast and effective in completing the quality control before dynamic scanning, which greatly helps the accuracy of clinical diagnostic results. Attached Figure Description

[0034] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. It is obvious that the drawings described below are merely some embodiments of the invention, and others can be obtained by those skilled in the art based on these drawings without inventive effort. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0035] Figure 1 This is a schematic diagram of the structure of a D-SPECT system according to an embodiment of the present invention;

[0036] Figure 2 This is a flowchart of a dynamic quality control method for a D-SPECT system according to an embodiment of the present invention;

[0037] Figure 3 This is a simulated radionuclide scan data of a D-SPECT system according to an embodiment of the present invention; and

[0038] Figure 4 These are cardiac scan data from a D-SPECT system after the dynamic quality control method of this invention. Detailed Implementation

[0039] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0040] In this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics represented in connection with that embodiment or example, which are included in at least one embodiment or example of this specification. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples represented in this specification, as well as the features of different embodiments or examples.

[0041] Throughout this specification, when it is said that a device is “connected” to another device, this includes not only “direct connection” but also “indirect connection” where other components are placed between them. Although in some instances the terms first, second, etc., are used herein to refer to various components, these components should not be limited by these terms. These terms are used only to distinguish one component from another. For example, first interface and second interface, etc. Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to also include the plural forms unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of the stated feature, step, operation, element, component, item, type, and / or group, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, types, and / or groups. The terms “or” and “and / or” as used herein are to be interpreted inclusively, or mean any one or any combination thereof. Therefore, "A, B, or C" or "A, B, and / or C" means "any one of the following: A; B; C; A and B; A and C; B and C; A, B, and C". Exceptions to this definition will only occur if the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0042] Although not explicitly defined, all terms, including technical and scientific terms used herein, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this specification pertains. Terms defined in commonly used dictionaries shall be further interpreted as having a meaning consistent with relevant technical literature and the content of this present instruction, and shall not be over-interpreted as having an ideal or overly formulaic meaning unless otherwise defined.

[0043] To ensure the stability of the D-SPECT system's performance during dynamic acquisition of target objects such as the heart, improve the accuracy of image results, shorten the dynamic quality control acquisition time of target objects, and improve the efficiency of dynamic quality control scanning of the heart, this invention provides a dynamic quality control method for a D-SPECT system. The D-SPECT system includes an L-shaped tomographic imaging probe with multiple detection units, a radioactive source simulated nuclide, an adjustable clamp, and a processing unit. One end of the adjustable clamp is connected to the L-shaped tomographic imaging probe; the other end of the adjustable clamp is connected to the radioactive source simulated nuclide; the processing unit is connected to the L-shaped tomographic imaging probe and receives photons from the L-shaped tomographic imaging probe at the radioactive source simulated nuclide. The quality control method for the D-SPECT system includes the following steps: multiple detection units acquire multiple scan data of the radioactive source simulated nuclide within a first time period, each scan data including time information and spatial information; the multiple scan data are divided into multiple first subsets corresponding to different time points according to the time information; each scan data is divided into second subsets corresponding to different locations according to the spatial information; the uniformity and / or resolution of the scan data are obtained based on the multiple first subsets; multiple time-activity curves are obtained based on the multiple second subsets; and the dynamic scan quality of the D-SPECT system is determined based on the uniformity of the scan data, the resolution of the scan data, and / or the multiple time-activity curves. The dynamic quality control method for the D-SPECT system of this invention evaluates the dynamic scan quality of the system by using scan data of the radioactive source simulated nuclide through the D-SPECT system. Based on the dynamic scan quality evaluation results, it can be determined whether the D-SPECT system needs further adjustment or whether it meets the requirements for the target data. The above method is simple, fast, and effective in completing quality control before dynamic scanning, greatly contributing to the accuracy of clinical diagnostic results.

[0044] The dynamic quality control method of the D-SPECT system of the present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments are not intended to limit the scope of protection of the present invention.

[0045] Figure 1This is a schematic diagram of a D-SPECT system according to an embodiment of the present invention. Specifically, the D-SPECT system includes an L-shaped tomographic imaging probe 1 with multiple detection units 11, a radioactive source simulated nuclide 2, an adjustable clamp 3, and a processing unit (not shown in the figure). One end of the adjustable clamp 3 is connected to the L-shaped tomographic imaging probe 1; the other end of the adjustable clamp 3 is connected to the radioactive source simulated nuclide 2. The processing unit is connected to the L-shaped tomographic imaging probe 1 and receives photon scanning data of the radioactive source simulated nuclide 2 from the L-shaped tomographic imaging probe 1. The number of detection units in the D-SPECT system is not limited. Of course, the D-SPECT system also includes a base, a bracket, and a three-section seat to support the L-shaped tomographic imaging probe during scanning. The L-shaped tomographic imaging probe also has a collimator inside, which can be fixed to avoid replacing the collimator during quality control.

[0046] Figure 2 This is a flowchart of a dynamic quality control method for a D-SPECT system according to an embodiment of this application. Specifically, the quality control method includes the following steps:

[0047] S10: Multiple detection units acquire multiple scan data of the radioactive source simulated nuclide within a first time period. Each scan data includes time information and spatial information. In this step, the data of the radioactive source simulated nuclide acquired by each detection unit in the L-shaped tomographic imaging probe of the D-SPECT system within the first time period is taken as a scan data. That is, the number of detection units in the D-SPECT system determines the number of scan data obtained. Each scan data contains the time information and spatial information of the detection unit or the acquired data. The time information is the time point corresponding to the number of photons acquired (or the first time period can be divided into n time periods, and the acquired data in each time period can be regarded as a frame of scan data). The spatial information is the location information corresponding to the number of photons acquired. The data acquired by multiple detection units at the same time point can construct a panoramic view of the radioactive source simulated nuclide that can be scanned by the L-shaped tomographic imaging probe.

[0048] The D-SPECT system of this invention features an upgraded detector crystal and structure. The detector crystal can be made of cadmium zinc telluride semiconductor, which significantly improves performance. This is mainly reflected in an 8-10 times increase in acquisition sensitivity, a 2-fold increase in energy resolution, and a 2-4 times increase in reconstruction resolution compared to traditional SPECT. More effective counts can be obtained in a shorter time, and the reconstructed images will also have higher resolution.

[0049] In this quality control method, the radioactive source simulating the radionuclide can be a specially designed solid-state radioactive source with low activity and a long half-life, such as Co-57, with a half-life of 270 days. The radioactive source simulating the radionuclide can be linear, and its length can cover the entire detector's field of view. This source can be used to simulate target scanning objects such as the human heart. During data acquisition, each detection unit in the L-shaped tomographic imaging probe faces the radioactive source simulating the radionuclide and rotates around its own axis. Each rotation is at a certain angle to ensure that the detection unit can fully collect the incident photons within the corresponding angle range at each rotation position when scanning the radioactive source simulating the radionuclide (the radioactive source simulating the radionuclide emits photons at any angle within a 360° range). The total acquisition time, i.e., the first duration, is set to be the same for each acquisition. In the embodiment of the D-SPECT system as a dedicated cardiac SPECT, preferably, the first duration is 6 minutes and 30 seconds (390 seconds) to ensure that the D-SPECT system can perform simple, effective, and complete dynamic cardiac data acquisition.

[0050] Of course, in actual quality control testing, before step S10, the D-SPECT system needs to be controlled to return to the Home position, that is, the L-shaped tomographic imaging probe should be kept in a horizontal position and the support should be perpendicular to the horizontal plane. Furthermore, the distance between the radioactive source simulated nuclide 2 of the D-SPECT system and the center position of the bend at the L-shaped tomographic imaging probe 1 can be adjusted by the adjustable clamp. This is only to allow adjustment of the relative position between the L-shaped tomographic imaging probe 1 as a whole and the radioactive source simulated nuclide 2; the distance between them is not limited to the distance at the center position of the bend at the L-shaped tomographic imaging probe 1. At this time, before the multiple detection units acquire multiple scan data of the radioactive source simulated nuclide within the first time period in step S10, the quality control method also includes the following steps:

[0051] S01: Adjust the distance between the simulated radionuclide and the center of the bend at the L-shaped tomographic probe according to the application parameters. Since the actual distance between the patient lying in the chair and the L-shaped tomographic probe varies depending on the target object being scanned (e.g., the heart), this distance can be determined based on the target object to ensure the accuracy of the D-SPECT system scan data after quality control testing. This distance can be determined based on empirical values; for example, when the D-SPECT system is used for cardiac SPECT, the distance between the simulated radionuclide and the center of the bend at the L-shaped tomographic probe ranges from 10cm to 20cm. The relative position of the simulated radionuclide 2 and the L-shaped tomographic probe 1 can be adjusted by using clamps of different lengths; no specific technical solution for distance adjustment is limited here. After determining the relative distance between the simulated radionuclide 2 and the L-shaped tomographic probe 1, a customized simulated radionuclide, such as a Co-57 beam source, only needs to be inserted into the other end of the clamp before data scanning.

[0052] S20: The multiple scan data are divided into multiple first subsets corresponding to different time points according to time information. The first subset can be regarded as a collection of photon information at various locations of the radioactive source simulated nuclide collected by multiple detection units at the same time point. And / or, each scan data is divided into a second subset corresponding to different locations according to spatial information. The second subset can be data related to the number of incident photons collected by a single detection unit within the entire first time period.

[0053] S30: Obtain the uniformity and / or resolution of the scan data based on multiple first subsets of data, and / or obtain multiple time-activity curves based on multiple second subsets of data. Since the radioactive source simulates the decay of the nuclide source over time, the number of incident photons collected by a single detector unit during the entire first time period will also decrease over time, thus obtaining a time-activity curve, such as... Figure 3 As shown in the lower left figure, the decay rate is obtained based on the time-activity curve.

[0054] In some embodiments, obtaining the uniformity of the scan data and / or resolution based on a plurality of first subsets of data in step S30 may include the following steps:

[0055] S31: Obtain panoramic images of the simulated radionuclide at corresponding time points based on the first subset dataset at each time point; more specifically, the ordered subset maximum expectation (OSEM) algorithm can be used to reconstruct the image based on the number of incident photons collected by multiple detector units at a time point.

[0056] S32: Obtain the uniformity and / or resolution of the scan data at each time point based on the panoramic view at each time point.

[0057] S40: The dynamic scan quality of the D-SPECT system is determined based on the uniformity of the scan data, the resolution of the scan data, and / or multiple time-activity curves.

[0058] Since the simulated radionuclide is linear, the obtained panoramic image should be a cylindrical radiation map centered on the simulated radionuclide. Theoretically, photons are uniformly distributed at a distance r from the simulated radionuclide. In this case, uniformity can be determined by dividing the panoramic image at a radius of R into units, and classifying the number of photons in each unit into levels. Different levels correspond to different color levels; units with more photons correspond to higher color levels and brighter colors. The differences in color levels across all units are evaluated to obtain a uniformity index. Figure 3This invention relates to a D-SPECT system simulating radionuclide scanning data. The D-SPECT system's L-shaped tomographic probe has nine detection units. The cardiac scan data of each detection unit is represented as a photon map with color gradations, displaying the photon count. For example, the photon count of each unit can be obtained; the difference between the photon count of each unit and a reference photon count can be calculated to obtain multiple photon count differences; the ratio of each photon count difference to the reference photon count can be calculated to obtain multiple ratios; the number of units with differences greater than a preset ratio can be obtained based on these ratios; and the percentage of units with differences greater than the preset ratio to the total number of units in the panoramic image can be calculated. This percentage can be used as a uniformity judgment parameter. When the percentage exceeds a first threshold, the uniformity is considered poor. In this case, the resolution index in the dynamic scanning quality of the D-SPECT system is considered not to meet the set requirements, and the D-SPECT system needs to be adjusted before it can be used for data acquisition of actual target scanning objects. When the percentage of the quantity is greater than or equal to the first threshold, the uniformity can be considered to meet the set requirements. At this time, the dynamic scanning quality of the D-SPECT system is considered to meet the set requirements.

[0059] Similarly, based on the aforementioned panoramic image, resolution judgment parameters can be obtained to determine whether the resolution is greater than the second threshold. If so, it is considered that the resolution index in the dynamic scanning quality of the D-SPECT system does not meet the set requirements, and the D-SPECT system needs to be adjusted before it can be used for data acquisition of the actual target scanning object. If not, it is considered that the resolution meets the set requirements, and in this case, the dynamic scanning quality of the D-SPECT system is considered to meet the set requirements.

[0060] Furthermore, based on the multiple decay rates of the multiple time-activity curves obtained in step S30, it can be determined whether the absolute value of the difference between each decay rate and the decay rate of the simulated radionuclide in the radioactive source is greater than a third threshold; if so, the dynamic scanning quality of the D-SPECT system is considered not to meet the set requirements; otherwise, the dynamic scanning quality of the D-SPECT system meets the set requirements. The first threshold, second threshold, and third threshold mentioned above are all determined based on actual empirical values ​​or models.

[0061] In practical applications, it can be set that if one or more of the above conditions are met, the dynamic scan quality of the D-SPECT system is considered to fail to meet the set requirements. Alternatively, the impact of uniformity, resolution, and time-activity curves on dynamic scan quality can be comprehensively considered based on models or experience to determine the dynamic scan quality level of the D-SPECT system. This determines whether adjustments to the D-SPECT system are necessary before actual application to the target scan object to achieve better clinical diagnostic results. The quality control method of this invention utilizes a dedicated radioactive source to simulate nuclides for dynamic quality control scanning. The quality control process is simpler and faster, and through quality control, the D-SPECT system has more accurate data acquisition performance, resulting in more accurate clinical diagnostic results. Figure 4 The cardiac scan data from the D-SPECT system obtained through the dynamic quality control method of this invention improves the accuracy of patient diagnosis.

[0062] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention and should not be construed as limiting the specific implementation of the invention to these descriptions. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be embraced within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A dynamic quality control method for a D-SPECT system, characterized in that, The D-SPECT system includes an L-shaped tomographic imaging probe with multiple detection units, a radioactive source simulated nuclide, an adjustable fixture, and a processing unit. One end of the adjustable clamp is connected to the L-shaped tomographic imaging probe; The other end of the adjustable clamp is connected to the radioactive source simulated nuclide; The processing unit is connected to the L-shaped tomographic imaging probe and receives photon scanning data of the radioactive source simulated nuclide from the L-shaped tomographic imaging probe. The distance between the simulated radionuclide of the radioactive source and the center position of the bend at the L-shaped tomographic imaging probe can be adjusted by the adjustable clamp; The quality control method includes the following steps: The distance between the simulated radionuclide of the radioactive source and the center position of the bend at the L-shaped tomographic imaging probe is adjusted according to the application parameters, which are determined according to the target scanning object; The multiple detection units acquire multiple scan data of the radioactive source simulated nuclide within a first time period, and each scan data includes time information and spatial information respectively; The multiple scan data are divided into multiple first subsets corresponding to different time points according to time information, and each scan data is divided into second subsets corresponding to different locations according to spatial information; The uniformity and resolution of the scan data are obtained based on multiple first subsets of data, and multiple time-activity curves are obtained based on multiple second subsets of data. The dynamic scan quality of the D-SPECT system is determined based on the uniformity of the scan data, the resolution of the scan data, and multiple time-activity curves.

2. The dynamic quality control method for the D-SPECT system according to claim 1, characterized in that, The distance between the simulated radionuclide from the radioactive source and the center of the angle of the L-shaped tomographic probe ranges from 10cm to 20cm.

3. The dynamic quality control method for the D-SPECT system according to claim 1, characterized in that, After the step of obtaining multiple time-activity curves based on multiple second subset datasets, the method further includes: The decay rate is obtained from the time-activity curve.

4. The dynamic quality control method for the D-SPECT system according to claim 1, characterized in that, The step of obtaining the uniformity and resolution of the scan data based on multiple first subset datasets includes the following steps: Based on the first subset of data at each time point, a panoramic view of the simulated radionuclide at the corresponding time point is obtained; The uniformity and resolution of the scan data at each time point are obtained from the panoramic images at each time point.

5. The dynamic quality control method for the D-SPECT system according to claim 3, characterized in that, Determining the dynamic scan quality of the D-SPECT system based on the uniformity of the scan data, the resolution of the scan data, and multiple time-activity curves includes the following steps: Determine whether the uniformity is greater than a first threshold; Determine whether the resolution is greater than the second threshold; Determine whether the absolute value of the difference between the attenuation rate and the attenuation rate of the radioactive source simulated nuclide is greater than a third threshold. If one or more of the above conditions are met, the dynamic scanning quality of the D-SPECT system is considered not to meet the set requirements.

6. The dynamic quality control method for the D-SPECT system according to claim 1, characterized in that, The radioactive source simulating the nuclide is Co-57, and the first duration is 390 seconds.

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