CN113393547B

CN113393547B - PET (positron emission tomography) coincidence data volume control method, device, equipment and storage medium

Info

Publication number: CN113393547B
Application number: CN202110571764.6A
Authority: CN
Inventors: 郑威; 孙友军; 李俊
Original assignee: Shanghai United Imaging Healthcare Co Ltd
Current assignee: Shanghai United Imaging Healthcare Co Ltd
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2023-03-24
Anticipated expiration: 2041-05-25
Also published as: CN113393547A

Abstract

The application relates to a PET coincidence data volume control method, a PET coincidence data volume control device, computer equipment and a storage medium. The method comprises the following steps: receiving delayed coincidence data of the PET detectors within a set time period; the set time period comprises at least one moment; obtaining a delay count value corresponding to the delay coincidence data at the first moment according to the delay coincidence data; the delay count value is used for representing the number of delay coincidence data existing in the first time and the previous time in the set time period; according to the delay count value and a preset delay count threshold, performing packet loss processing on the delay coincidence data at the first time and the subsequent time within the set time period; the delay count threshold is related to the throughput of the data acquisition link to transmit and receive the immediate compliance data and the delayed compliance data. By adopting the method, the realization cost of the subsequent devices and the workstations of the circuit can be reduced.

Description

PET (positron emission tomography) coincidence data volume control method, device, equipment and storage medium

Technical Field

The application relates to the technical field of computers, in particular to a PET coincidence data volume control method, device, equipment and storage medium.

Background

With the development of PET (Positron Emission Tomography), when a patient goes to a hospital for some specific problems, a doctor usually injects a radionuclide into the patient, and detects nuclides in the patient by using a PET system to obtain a PET image, and then obtains an examination result of the patient by analyzing the PET image.

Currently, PET systems mainly include ring detectors, coincidence circuits, workstations, and the like. Wherein the ring detector mainly detects photons released by nuclides in the patient's body, converts the photons into electrical signals, converts the electrical signals into digital signals, and sends the digital signals to the coincidence circuit. The coincidence circuit checks and judges the time of the digital signal transmitted by each detector to obtain coincidence data, the position of a positive electron is given through calculation, and finally the workstation completes image reconstruction by adopting the technologies of scattering, accidental coincidence signal correction, photon flight time calculation and the like to obtain a PET image.

However, as the number of detectors of the PET system is increased, more and more signals are transmitted to the coincidence circuit by the detectors, and then, the data amount of the coincidence data screened by the coincidence circuit is more and more, which has a very high requirement on hardware and software of the devices and workstations following the coincidence circuit, so that the implementation cost of the devices and workstations following the coincidence circuit is high.

Disclosure of Invention

In view of the above, it is necessary to provide a PET compliant data volume control method, apparatus, device, and storage medium that can reduce the implementation cost of devices and workstations that are subsequent to a compliant circuit.

A PET coincidence data volume control method, the method comprising:

receiving delayed coincidence data of the PET detectors within a set time period; the set time period comprises at least one moment;

obtaining a delay count value corresponding to the delay coincidence data at the first moment according to the delay coincidence data; the delay count value is used for representing the number of delay coincidence data existing in the first time and the previous time in the set time period;

performing packet loss processing on the delay coincidence data at the first time and the subsequent time within the set time period according to the delay count value and a preset delay count threshold; the delay count threshold is related to the throughput of the data acquisition link in transceiving the immediate coincidence data and the delayed coincidence data.

In one embodiment, the performing packet loss processing on the delay coincidence data at the first time and the subsequent time within the set time period according to the delay count value and a preset delay count threshold includes:

judging whether the delay count value is greater than a delay count threshold value or not to obtain a count value judgment result;

and performing packet loss processing on the delay coincidence data at the first time and the subsequent time in the set time period according to the counting value judgment result.

In one embodiment, the performing packet loss processing on the delay coincidence data at the first time and the subsequent time within the set time period according to the count value determination result includes:

and if the delay count value is larger than the delay count threshold, performing packet loss processing on the delay coincidence data at the first time and the subsequent time in the set time period.

In one embodiment, the data acquisition link includes data acquisition software, data acquisition hardware, and data storage hardware, and the delay count threshold is determined in a manner that includes:

acquiring the maximum reading and writing speed of the data acquisition software, the maximum transmission speed of the data acquisition hardware and the maximum storage speed of the data storage hardware;

and determining the delay count threshold according to the maximum read-write speed, the maximum transmission speed and the maximum storage speed.

In one embodiment, the determining the delay count threshold according to the maximum read/write speed, the maximum transmission speed, and the maximum storage speed includes:

acquiring the minimum value of the maximum read-write speed, the maximum transmission speed and the maximum storage speed;

carrying out proportional operation processing on the minimum value according to a preset proportion to determine the delay counting threshold value; the predetermined ratio is related to a maximum transmission bandwidth of the real-time compliant data.

In one embodiment, the method further includes:

obtaining a delay count value of delay coincidence data received in the set time period;

writing the delay count value of the delay coincidence data received in the set time period into the original data; the original data is instant coincidence data and delayed coincidence data received by the data acquisition link in the set time period.

In one embodiment, the obtaining the delay count value of the delay coincidence data received in the set time period includes:

acquiring an initial delay count value;

judging whether delay coincidence data exist at any time in the set time period or not to obtain a data judgment result;

and determining the delay count value of the delay conforming data received in the set time period according to the data judgment result and the initial delay count value.

In one embodiment, the determining, according to the data determination result and the initial delay count value, a delay count value of delay matching data received in the set time period includes:

if delay coincidence data exist at one moment, adding one operation to the initial delay count value to obtain a new delay count value, and determining the delay count value of the delay coincidence data according to the new delay count value;

if there is no delayed coincidence data at another time, the delay count value of the delayed coincidence data is kept unchanged.

In one embodiment, the method further includes:

compensating the original data according to the delay count value of the delay coincidence data received in the set time period and the preset delay count threshold value, and determining the compensated original data;

and carrying out image reconstruction according to the compensated original data to determine a PET image.

In one embodiment, the compensating the original data according to the delay count value of the delay coincidence data received within the set time period and the preset delay count threshold, and determining compensated original data includes:

calculating the ratio of the delay count value of the received delay conforming data in the set time period to the preset delay count threshold value;

and compensating the original data according to the comparison value, and determining the compensated original data.

In one embodiment, the method further includes:

judging whether the current time is the same as the end time of the set time period or not to obtain a time judgment result;

and performing zero clearing operation on the delay count value of the delay coincidence data received in the set time period according to the time judgment result.

In one embodiment, the clearing, according to the time determination result, the delay count value of the delay coincidence data received in the set time period includes:

if the current time is the same as the end time of the set time period, setting the delay count value of the delay coincidence data received in the set time period to zero, and returning to the step of receiving the instant coincidence data and the delay coincidence data in the set time period.

A PET coincidence data volume control device, the device comprising:

the receiving module is used for receiving the delayed coincidence data of the PET detector within a set time period; the set time period comprises at least one moment;

the determining module is used for obtaining a delay count value corresponding to the delay coincidence data at the first moment according to the delay coincidence data; the delay count value is used for representing the number of delay coincidence data existing in the first time and the previous time in the set time period;

the control module is used for performing packet loss processing on the delay coincidence data at the first moment and the subsequent moment in the set time period according to the delay count value and a preset delay count threshold; the delay count threshold is related to the throughput of the data acquisition link to transmit and receive the immediate coincidence data and the delayed coincidence data.

A computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:

receiving delayed coincidence data of the PET detector within a set time period; the set time period comprises at least one moment;

A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:

performing packet loss processing on the delay coincidence data at the first time and the subsequent time within the set time period according to the delay count value and a preset delay count threshold; the delay count threshold is related to the throughput of the data acquisition link to transmit and receive the immediate coincidence data and the delayed coincidence data.

According to the PET coincidence data amount control method, the PET coincidence data amount control device, the computer equipment and the storage medium, the PET delayed coincidence data are received in the set time period, the delay count value corresponding to the delayed coincidence data at the first moment is obtained according to the received delayed coincidence data, and packet loss processing is carried out on the delayed coincidence data at the first moment and the subsequent moments in the set time period according to the delay count value and the delay count threshold value; the set time period comprises at least one moment, the delay calculation value is used for representing the number of the delayed coincidence data existing at the current moment, and the delay count threshold is related to the throughput of the data acquisition link for receiving and transmitting the instant coincidence data and the delayed coincidence data. In the method, because the delay count threshold is related to the throughput of the data acquisition link to the instant coincidence data and the delayed coincidence data, and the delayed coincidence data can be subjected to packet loss processing according to the delay count value and the delay count threshold at the current moment, the data volume of the delayed coincidence data received by the data acquisition link can be reduced, the received data volume is small, the requirements on hardware conforming to subsequent devices of a circuit and a workstation in the acquisition link are lower naturally, and the implementation cost of the hardware can be reduced correspondingly. In addition, because packet loss processing is performed on the delay coincidence data based on the time dimension (i.e., in each set time period), data packet loss processing is performed in each set time period, i.e., data lost in a large time period is uniform, so that the distribution condition of the delay coincidence data is not changed, and the result obtained by subsequently performing image reconstruction on the delay coincidence data is more accurate.

Drawings

FIG. 1 is a diagram of an exemplary embodiment of a PET coincidence data volume control method;

FIG. 2 is a schematic flow chart of a PET coincidence data volume control method in one embodiment;

FIG. 3 is a schematic flow chart showing the PET coincidence data volume control step in another embodiment;

FIG. 4 is a schematic flow chart of a PET coincidence data volume control method in another embodiment;

FIG. 5 is a schematic flow chart illustrating a PET coincidence data volume control method according to another embodiment;

FIG. 6 is a schematic flow chart illustrating a PET coincidence data volume control method in accordance with another embodiment;

FIG. 7 is a schematic flow chart illustrating a PET coincidence data volume control method according to another embodiment;

FIG. 8 is a block diagram of the PET coincidence data volume control apparatus in one embodiment;

FIG. 9 is a diagram illustrating an internal structure of a computer device according to an embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.

The PET coincidence data volume control method provided by the embodiment of the application can be applied to a data acquisition link shown in FIG. 1. The data acquisition link comprises a CCB board card, an ACQ board card, an RDM, an SSD, a Reader and a RECON. CCB refers to a coincidence control circuit board, ACQ refers to a data acquisition card, RDM refers to data acquisition software, SSD refers to a solid state disk, reader refers to a data Reader, and RECON refers to an image reconstructor. In the actual data acquisition process, the CCB receives data transmitted by the photoelectric detector, is responsible for data coincidence processing, transmits the screened instant coincident data and delayed coincident data to the two ACQ board cards through the two optical fiber interfaces, the ACQ board cards are responsible for data acquisition, can upload the received data to an acquisition PC end through a PCIe bus and interfaces, RDM data acquisition software of the PC end can acquire the data, and moves the data to the SSD through a direct memory access DMA mode, then merges the two paths of data through the Reader, and finally carries out image reconstruction on the RECON.

In addition, the PET compliance data volume control method provided in this embodiment mainly performs data compliance processing in the CCB, where the CCB may include a computer device, and the computer device may be an FPGA (Field Programmable Gate Array), or may be a device including an FPGA and other devices.

It should be noted that the execution main body in the embodiment of the present application may be a computer device, or may be a PET compliance data volume control device, or may be a CCB board, or may also be an FPGA, and the following describes the technical solution in the embodiment of the present application with the computer device as the execution main body.

In one embodiment, as shown in fig. 2, a PET coincidence data volume control method is provided, which may include the steps of:

s202, receiving delayed coincidence data of the PET detector in a set time period; at least one time is included in the set time period.

The set time period refers to a period of time controlled by a timer, and may be a periodic time period. For example, the timer is 15 minutes and periodic, and the starting time is 10, then the set time period is 10.

The time within the set time period may be determined according to actual circumstances, and may be, for example, one time per second, one time per minute, or one time per hour. Exemplarily, assuming that the setting time period is 10-10, one time in minutes, then 15.

Further, in the set time period, instant coincidence data of the PET detector can be received, where the instant coincidence data refers to coincidence data transmitted in real time through coincidence screening, including coincidence true events, which generally directly affect the sensitivity index and quantitative correctness index of the PET reconstructed image, so that the transmission of the instant coincidence data is important. Delayed coincidence data refers to coincidence data that passes the coincidence screen but has a delay in the transmission process and can be used to estimate random coincidence events in the instant coincidence data.

Specifically, the PET detector may always detect the instant coincidence data and the delayed coincidence data, and after the PET detector detects the instant coincidence data and the delayed coincidence data, the detected instant coincidence data and the delayed coincidence data may be sent to the coincidence processing circuit within a set time period, that is, sent to the computer device for processing. The immediate coincidence data and the delayed coincidence data can be transmitted to the computer device via two paths.

S204, obtaining a delay count value corresponding to the delay coincidence data at the first moment according to the delay coincidence data; the delay count value is used to indicate the number of delay coincidence data existing in the first time and the previous time within the set time period.

The first time may also be understood as the current time. The computer device receives the data transmitted by the PET detectors for a set period of time, but in practice there will not be instantaneous coincidence data and delayed coincidence data at every instant in the set period of time, i.e. there will be instants where there is no instantaneous coincidence data and/or delayed coincidence data, and it can be assumed that there is one instant of coincidence data and delayed coincidence data at one instant. Then, within the set time period, the computer device may count the number of the instant coincidence data and the delayed coincidence data received before the current time according to the received instant coincidence data and the delayed coincidence data, that is, count the time at which the delayed coincidence data is received in the time before the current time.

For example, assuming that the setting time period is 10-10, 15, one time in minutes, the current time (i.e., the first time) is 10.

After obtaining the number of times at which the delayed coincidence data exists, the number of times at which the delayed coincidence data exists may be used as a delay count value of the current time, that is, a delay count value corresponding to the delayed coincidence data of the first time is obtained.

S206, according to the delay count value and a preset delay count threshold, performing packet loss processing on the delay coincidence data at the first time and the subsequent time within the set time period; the delay count threshold is related to the throughput of the data acquisition link in transceiving the immediate coincidence data and the delayed coincidence data.

The packet loss in this embodiment may be understood as dropping one or more delay compliant data in a current data acquisition link, where the dropped delay compliant data is not transmitted to a subsequent data acquisition link.

Throughput refers to the amount of data (which may be characterized in bits, bytes, packets, etc.) successfully transmitted per unit time for a network, device, port, virtual circuit, or other facility, and in this embodiment throughput is understood to be the maximum amount of data that a data acquisition link can receive or transmit per s unit time for immediate compliance data as well as delayed compliance data.

In this step, the delay count threshold is related to the throughput of the data acquisition link receiving or transmitting the instant coincidence data and the delay coincidence data, i.e. the maximum amount of data that can be received or transmitted, and may be preset according to the actual situation, for example, 3GB/s, 2.5GB/s, etc.

Specifically, after obtaining the delay count value of the delay coincidence data at the current moment, whether the delay count value meets the delay count threshold requirement can be judged, and if the delay count value meets the requirement, all the delay coincidence data before the current moment in a set time period are transmitted to a subsequent data acquisition link; if the delay count does not meet the requirement, one part of delay coincidence data which does not meet the delay count threshold in the set time period is discarded, only the rest part of delay coincidence data is transmitted, the data volume received by the data acquisition link is reduced, and the pressure of the data acquisition link is relieved. And for the received instant coincidence data, if the instant coincidence data exists, the instant coincidence data is directly transmitted to a subsequent data acquisition link for subsequent data processing.

In the PET coincidence data amount control method, the delayed coincidence data of the PET is received in a set time period, the delay count value corresponding to the delayed coincidence data at the first moment is obtained according to the received delayed coincidence data, and packet loss processing is carried out on the delayed coincidence data at the first moment and the subsequent moments in the set time period according to the delay count value and the delay count threshold; the set time period comprises at least one moment, the delay calculation value is used for representing the number of the delayed coincidence data existing at the current moment, and the delay count threshold is related to the throughput of the data acquisition link for receiving and transmitting the instant coincidence data and the delayed coincidence data. In the method, because the delay count threshold is related to the throughput of the data acquisition link to the instant coincidence data and the delayed coincidence data, and the delayed coincidence data can be subjected to packet loss processing according to the delay count value and the delay count threshold at the current moment, the data volume of the delayed coincidence data received by the data acquisition link can be reduced, the received data volume is small, the requirements on hardware conforming to subsequent devices of a circuit and a workstation in the acquisition link are lower naturally, and the implementation cost of the hardware can be reduced correspondingly. In addition, because packet loss processing is performed on the delay coincidence data based on the time dimension (i.e., in each set time period), data packet loss processing is performed in each set time period, i.e., data lost in a large time period is uniform, so that the distribution condition of the delay coincidence data is not changed, and the result obtained by subsequently performing image reconstruction on the delay coincidence data is more accurate.

In another embodiment, as shown in fig. 3, another PET coincidence data volume control method is provided, and on the basis of the above embodiment, the above S206 may include the following steps:

s302, judging whether the delay count value is larger than the delay count threshold value or not, and obtaining a count value judgment result.

In this step, the determining whether the delay count value is greater than the delay count threshold value may include: the delay count value is differed from the delay count threshold value to obtain a difference value, and the difference value is compared with 0 to obtain a difference value comparison result; or making a quotient of the delay count value and the delay count threshold value to obtain a quotient value, and comparing the quotient value with 1 to obtain a quotient value comparison result; or other determination means may be used. The difference comparison result, the quotient comparison result, and the comparison result, i.e., the count value determination result, are obtained here.

S304, performing packet loss processing on the delay coincidence data at the first time and the subsequent time within the set time period according to the counting value determination result.

In this step, the count value determination result includes two types, one is that the delay count value is greater than the delay count threshold value, and the other is that the delay count value is not greater than the delay count threshold value, which will be described below.

In a possible embodiment, if the delay count value is not greater than the delay count threshold, the delay coincidence data of the first time and the previous time is transmitted to the subsequent data acquisition link. That is, if the difference is equal to or less than 0, or if the quotient is equal to or less than 1, it may be determined that the delay count value is equal to or less than the delay count threshold, that is, the delay count value is not greater than the delay count threshold. At this time, it is described that the data volume of the delay coincidence data at the current time meets the transmission requirement, and then all the delay coincidence data before the current time in the set time period can be transmitted to the subsequent data acquisition link.

In another possible embodiment, if the delay count value is greater than the delay count threshold, packet loss processing is performed on the delay coincidence data at the first time and the subsequent time within the set time period. That is, if the difference is greater than 0 or if the quotient is greater than 1, it may be determined that the delay count value is greater than the delay count threshold. At this time, it is indicated that the data amount of the delay coincidence data does not meet the transmission requirement, and then the delay coincidence data at the current time and the subsequent time can be discarded.

For example, assuming that the setting time period is 10-10, and one time in minutes, the delay count threshold is 8, the current time (i.e. the first time) is 10.

The above manner may be determined for any set time period, and is only exemplified by one set time period.

In this embodiment, by determining whether the delay count value is greater than the delay count threshold value, and performing packet loss processing on the delay coincidence data at the first time and the subsequent time within the set time period according to the obtained determination result, the delay coincidence data that needs packet loss processing can be simply and intuitively obtained through the determination process, so that the efficiency of controlling the PET coincidence data amount can be improved. Further, if the delay count value is greater than the delay count threshold, packet loss processing may be performed on the delay coincidence data at the first time and the subsequent time, so that the time at which packet loss is required may be further determined, and an effect of accurately losing packets may be achieved.

In another embodiment, as shown in fig. 4, another PET coincidence data volume control method is provided, on the basis of the above embodiment, where the above mentioned data acquisition link includes data acquisition software, data acquisition hardware and data storage hardware, then the above manner of determining the delay count threshold value may include the following steps:

s402, acquiring the maximum read-write speed of the data acquisition software, the maximum transmission speed of the data acquisition hardware and the maximum storage speed of the data storage hardware.

The data acquisition software refers to RDM in the application environment, the data acquisition hardware refers to ACQ data acquisition cards in the application environment, and the data storage hardware refers to SSD solid state disk in the application environment. These three maximum speeds are all the relative speeds at which the instantaneous compliance data and the delayed compliance data affect the throughput of the data acquisition link during transmission.

The maximum read/write speed, the maximum transfer speed, and the maximum storage speed are in the same unit, and may be, for example, GB/s, GB/min, GB/μ s, or the like. The maximum read/write speed of RDM, the maximum transfer speed of ACQ, and the maximum storage speed of SSD may be preset, for example: the maximum read-write speed of the RDM is 20GB/s, the maximum transmission speed of the ACQ is 15GB/s, and the maximum storage speed of the SSD is 30GB/s.

S404, determining the delay count threshold according to the maximum read/write speed, the maximum transmission speed, and the maximum storage speed.

In this step, after obtaining the three maximum speeds, optionally, a minimum value of the maximum read-write speed, the maximum transmission speed, and the maximum storage speed may be obtained; carrying out proportional operation processing on the minimum value according to a preset proportion to determine the delay counting threshold value; the predetermined ratio is related to a maximum transmission bandwidth of the real-time compliant data.

The preset proportion can be set according to the maximum transmission bandwidth of the real-time coincidence data in practical situations, and can be 80%, 90% and the like. After the preset proportion is set and the minimum value of the three speeds is obtained, the preset proportion can be directly multiplied by the minimum value to obtain a product value, and the product value is used as a delay counting threshold value.

Of course, the preset ratio and the delay count threshold may be obtained according to actual situations. In an example, assuming that the maximum transmission bandwidth of the instant coincident data is 10GB/s, the maximum read-write speed of the RDM is 20GB/s, the maximum transmission speed of the ACQ is 15GB/s, and the maximum storage speed of the SSD is 30GB/s, the three maximum speeds are respectively 10GB/s, 7.5GB/s, and 15GB/s on two transmission channels, where the minimum value is 7.5GB/s, and the maximum transmission bandwidth of the instant coincident data is less than 10GB/s, in order to ensure the transmission of the instant coincident data, the speeds of the two transmission channels of the ACQ corresponding to 7.5GB/s are not uniformly distributed, for example, a 70% ratio can be set for a channel transmitting the instant coincident data, so that the transmission of the instant coincident data reaches 15 × 70% =10.5GB/s, the maximum transmission bandwidth of the instant coincident data is satisfied, a 30% ratio can be set for a channel transmitting the instant coincident data, so that the transmission of the instant coincident data reaches 15 × 70% =10.5GB/s, and the delay count threshold of the instant coincident data is 4.5 GB/s.

In the embodiment, the maximum reading-writing speed of the data acquisition software, the maximum transmission speed of the data acquisition hardware and the maximum storage speed of the data storage hardware are obtained, and the delay counting threshold is determined through the three maximum speeds, so that the determination mode is simple and visual, the speed of determining the delay counting threshold can be increased, and the efficiency of controlling the PET coincidence data volume can be improved. Furthermore, the delay counting threshold value can be determined through the minimum value of the three maximum speeds and a preset proportion, and the preset proportion is related to the maximum transmission bandwidth of the instant coincidence data, so that the determined delay counting threshold value can meet the actual transmission requirement of the instant coincidence data, and the accuracy of the instant coincidence data transmission is improved.

In another embodiment, as shown in fig. 5, another PET coincidence data volume control method is provided, and on the basis of the above embodiment, the method may further include the following steps:

s502, a delay count value of the delay coincidence data received in the set time period is obtained.

In this step, optionally, the delay count value may be obtained by the following steps A1 to A3:

step A1, obtaining an initial delay count value.

The initial delay count value may be set according to actual conditions, for example, the initial delay count value in each set time period may be 0.

And step A2, judging whether delay coincidence data exist at any time in the set time period, and obtaining a data judgment result.

In this step, starting from an initial time within a set time period, it is determined whether delayed coincidence data exists at each time (i.e., whether delayed coincidence data is transmitted or not), and a data determination result is obtained.

And step A3, determining a delay count value of the delay conforming data received in the set time period according to the data judgment result and the initial delay count value.

In this step, optionally, if there is delay coincidence data at a moment, adding one to the initial delay count value to obtain a new delay count value, and determining the delay count value of the delay coincidence data according to the new delay count value; if there is no delayed coincidence data at another time, the delay count value of the delayed coincidence data is kept unchanged.

That is, if there is delay coincidence data at the first time, adding one to the initial delay count value to obtain a sum value, and using the sum value as the delay count value corresponding to the next time, and so on for the following times, so as to obtain the delay count value corresponding to each time; if no delay coincidence data exists at a certain moment, the delay count value at the moment is kept unchanged, namely the delay count value corresponding to the moment before the moment.

S504, writing the delay count value of the delay coincidence data received in the set time period into the original data; the original data is instant coincidence data and delayed coincidence data received by the data acquisition link in the set time period.

In this step, since there may be data packet loss processing in each set time period, that is, the delay coincidence data received in the set time period is not complete data, the delay count value in each set time period may be written into the original data corresponding to the set time period for the convenience of subsequent image reconstruction. Here, each set time period may correspond to one piece of original data, the delay count value refers to a last count value within the set time period, for example, the set time period is 10 to 10, and one time in minutes, the delay count threshold is 8, where the delay count value at time 10; alternatively, at time 10.

In this embodiment, the obtained delay count value in the set time period is written into the original data, where the original data is the instant coincidence data and the delay coincidence data received by the data acquisition link in the set time period, and the delay count value is written into the original data, so that image reconstruction of the PET image through the delay count value and the original data can be performed conveniently in the subsequent process. Further, the delay count value in the set time period can be determined more quickly and accurately by the initial delay count value and the determination result of whether the delay coincidence data exists in the set time period. Furthermore, the delay count value is obtained by adding one and maintaining, so that the delay count value can be simply and intuitively obtained, and the accuracy of obtaining the delay count value is improved.

In another embodiment, as shown in fig. 6, another PET coincidence data volume control method is provided, and on the basis of the above embodiment, the method may further include the following steps:

s602, compensating the original data according to the delay count value of the delay coincidence data received in the set time period and the preset delay count threshold, and determining the compensated original data.

In this step, the raw data in each set time period may be compensated by using the delay count value and the delay count threshold value in each set time period, where the delay count threshold value in each set time period is generally the same. When compensating the original data in each set time period, optionally, a ratio of a delay count value of the delay coincidence data received in the set time period to the preset delay count threshold value may be calculated; and compensating the original data according to the comparison value, and determining the compensated original data.

That is to say, after the delay count value and the delay count threshold are obtained in each set time period, the delay count value may be divided by the delay count threshold to obtain a ratio of the two, and by the ratio of the two, how much delay matched data is missing can be known, so that the original data can be compensated according to how much is missing. For example: the ratio of the delay count value to the delay count threshold value in a set time period is 1/10, so that the delay coincidence data is received by only one tenth, the compensated data is 10 times of the current original data, the pixel value or voxel value on the original data can be multiplied by 10, and the obtained new data is the compensated original data.

And S604, carrying out image reconstruction according to the compensated original data to determine a PET image.

In this step, when performing image reconstruction, the compensated raw data corresponding to each set time period may be acquired, and then the compensated raw data corresponding to all the set time periods is used to perform image reconstruction, so as to obtain a reconstructed PET image. Here, in image reconstruction, an FBP filtered back projection algorithm, an iterative algorithm, or the like may be used.

In the embodiment, the original data are compensated through the delay count value and the delay count threshold value in the set time period, the compensated original data are determined, the image reconstruction is performed according to the compensated original data, and the PET image is determined. Furthermore, the original data can be compensated through the ratio of the delay count value to the delay count threshold value in each period of time, and the compensation process is simple and effective, so that the data compensation efficiency can be improved, and the image reconstruction efficiency can be improved.

In another embodiment, as shown in fig. 7, another PET coincidence data volume control method is provided, and on the basis of the above embodiment, the method may further include the following steps:

s702, judging whether the current time is the same as the end time of the set time period or not, and obtaining a time judgment result.

In this step, each set time period has a start time and an end time, for example, the set time period is 10.

The computer equipment is in a state of always receiving in the process of receiving the instant coincidence data and the delayed coincidence data sent by the PET detector in the set time period, so that whether the current time of the received data reaches the end time of the set time period or not can be judged, that is, whether the current time is the same as the end time or not can be judged, and the same or different time judgment results can be obtained. For example, if the setting time period is 10.

S704, clearing the delay count value of the delay coincidence data received in the set time period according to the time determination result.

In this step, optionally, if the current time is different from the end time of the set time period, and generally the current time does not reach the end time of the set time period, the instant coincidence data and the delayed coincidence data may be continuously received within the set time period.

If the current time is the same as the end time of the set time period, setting the delay count value of the delay coincidence data received in the set time period to be zero, and returning to the step of receiving the instant coincidence data and the delay coincidence data in the set time period. That is to say, if the current time reaches the end time of the set time period, the delay count value in the set time period can be cleared, and counting is restarted in the next set time period, so that it can be ensured that the data received in each set time period is not too long, and the problems of data loss and difficult storage caused by too long data are avoided.

In this embodiment, by determining whether the current time is the same as the end time of the set time period and resetting the delay count value in the set time period according to the obtained time determination result, it is ensured that the data received in each set time period is not too long, and the problems of data loss and difficulty in storage due to too long data are avoided. Further, when the current time is the same as the end time of the set time period, the delay count value in the set time period is cleared, so that when the clearing operation is performed can be accurately known, and the problem of data loss caused by misoperation is avoided.

It should be understood that although the various steps in the flow charts of fig. 2-7 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2-7 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the steps or stages is not necessarily sequential, but may be performed alternately or alternatingly with other steps or at least some of the other steps or stages.

In one embodiment, as shown in fig. 8, there is provided a PET coincidence data volume control device, comprising: a receiving module 10, a determining module 11 and a control module 12, wherein:

a receiving module 10, configured to receive delayed coincidence data of a PET detector within a set time period; the set time period comprises at least one moment;

a determining module 11, configured to obtain a delay count value corresponding to the delay coincidence data at the first time according to the delay coincidence data; the delay count value is used for representing the number of delay coincidence data existing in the first time and the previous time in the set time period;

a control module 12, configured to perform packet loss processing on the delay coincidence data at the first time and at the subsequent time within the set time period according to the delay count value and a preset delay count threshold; the delay count threshold is related to the throughput of the data acquisition link to transmit and receive the immediate coincidence data and the delayed coincidence data.

For specific definition of the PET coincidence data volume control device, reference may be made to the above definition of the PET coincidence data volume control method, which is not described herein again.

In another embodiment, another PET coincidence data volume control device is provided, and on the basis of the above embodiment, the control module 12 may include a count value judgment unit and a control unit, wherein:

a count value judging unit, configured to judge whether the delay count value is greater than a delay count threshold value, and obtain a count value judgment result;

and the control unit is used for performing packet loss processing on the delay coincidence data at the first time and the subsequent time in the set time period according to the counting value judgment result.

Optionally, the control unit is specifically configured to, when the delay count value is greater than the delay count threshold, perform packet loss processing on delay coincidence data at a first time and at subsequent times within the set time period.

In another embodiment, another PET coincidence data volume control device is provided, on the basis of the above embodiment, the data acquisition link includes data acquisition software, data acquisition hardware and data storage hardware, and the device may further include a threshold determination module, which includes a maximum speed acquisition unit and a threshold determination unit, wherein:

a maximum speed obtaining unit, configured to obtain a maximum read-write speed of the data acquisition software, a maximum transmission speed of the data acquisition hardware, and a maximum storage speed of the data storage hardware;

a threshold determining unit, configured to determine the delay count threshold according to the maximum read/write speed, the maximum transmission speed, and the maximum storage speed.

Optionally, the threshold determining unit is specifically configured to obtain a minimum value of the maximum read-write speed, the maximum transmission speed, and the maximum storage speed; carrying out proportional operation processing on the minimum value according to a preset proportion to determine the delay counting threshold value; the predetermined ratio is related to a maximum transmission bandwidth of the real-time compliant data.

In another embodiment, another PET coincidence data volume control device is provided, and on the basis of the above embodiment, the device may further include a count value obtaining module and a data writing module, wherein:

a count value acquisition module, configured to acquire a delay count value of delay coincidence data received within the set time period;

a data writing module, configured to write a delay count value of the delay coincidence data received within the set time period into original data; the original data is instant coincidence data and delayed coincidence data received by the data acquisition link in the set time period.

Optionally, the count value obtaining module may include an initial value obtaining unit, a data determining unit, and a count value determining unit, where:

an initial value acquisition unit for acquiring an initial delay count value;

the data judging unit is used for judging whether delay coincidence data exist at any time in the set time period to obtain a data judging result;

and a count value determining unit configured to determine a delay count value of delay coincidence data received within the set time period according to the data determination result and the initial delay count value.

Optionally, the count value determining unit is specifically configured to, in a case that there is delay coincidence data at a time, add one to the initial delay count value to obtain a new delay count value, and determine the delay count value of the delay coincidence data according to the new delay count value; in the case where there is no delay coincidence data at another timing, the delay count value of the delay coincidence data is kept unchanged.

In another embodiment, another PET coincidence data volume control apparatus is provided, which may further include a compensation module and a reconstruction module on the basis of the above embodiment, wherein:

a compensation module, configured to compensate the original data according to a delay count value of delay coincidence data received within the set time period and the preset delay count threshold, and determine compensated original data;

and the reconstruction module is used for reconstructing an image according to the compensated original data and determining a PET image.

Optionally, the compensation module may include a ratio calculation unit and a compensation unit, wherein:

a ratio calculation unit, configured to calculate a ratio between a delay count value of the delay coincidence data received within the set time period and the preset delay count threshold;

and the compensation unit is used for compensating the original data according to the ratio and determining the compensated original data.

In another embodiment, another PET coincidence data volume control device is provided, and on the basis of the above embodiment, the device may further include a time judgment module and a zero clearing module, wherein:

the time judging module is used for judging whether the current time is the same as the tail time of the set time period or not to obtain a time judging result;

and the zero clearing module is used for carrying out zero clearing operation on the delay count value of the delay coincidence data received in the set time period according to the time judgment result.

Optionally, the clear module is specifically configured to set a delay count value of the delay coincidence data received in the set time period to zero when the current time is the same as the end time of the set time period, and return to perform the steps of receiving the immediate coincidence data and the delay coincidence data in the set time period.

For specific definition of the PET coincidence data amount control device, reference may be made to the above definition of the PET coincidence data amount control method, which is not described herein again.

The various modules in the PET coincidence data volume control device described above may be implemented in whole or in part by software, hardware, and combinations thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.

In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 9. The computer device includes a transceiver, a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. The transceiver of the computer device is used for receiving and transmitting data. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used for communicating with an external terminal in a wired or wireless manner, and the wireless manner can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a PET compliance data volume control method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.

Those skilled in the art will appreciate that the architecture shown in fig. 9 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.

In one embodiment, there is provided a computer device comprising a transceiver, a memory and a processor, the memory having stored therein a computer program that when executed by the processor performs the steps of:

the transceiver is used for receiving the delayed coincidence data of the PET detector within a set time period; the set time period comprises at least one moment;

the processor is used for obtaining a delay count value corresponding to the delay coincidence data at the first moment according to the delay coincidence data when executing the computer program; the delay count value is used for representing the number of delay coincidence data existing in the first time and the previous time in the set time period; performing packet loss processing on the delay coincidence data at the first time and the subsequent time within the set time period according to the delay count value and a preset delay count threshold; the delay count threshold is related to the throughput of the data acquisition link to transmit and receive the immediate coincidence data and the delayed coincidence data.

In one embodiment, the processor, when executing the computer program, further performs the steps of:

judging whether the delay count value is greater than a delay count threshold value or not to obtain a count value judgment result; and performing packet loss processing on the delay coincidence data at the first time and the subsequent time in the set time period according to the counting value judgment result.

acquiring the maximum reading and writing speed of the data acquisition software, the maximum transmission speed of the data acquisition hardware and the maximum storage speed of the data storage hardware; and determining the delay count threshold according to the maximum read-write speed, the maximum transmission speed and the maximum storage speed.

acquiring the minimum value of the maximum read-write speed, the maximum transmission speed and the maximum storage speed; carrying out proportional operation processing on the minimum value according to a preset proportion to determine the delay counting threshold value; the predetermined ratio is related to a maximum transmission bandwidth of the real-time compliant data.

obtaining a delay count value of delay coincidence data received in the set time period; writing the delay count value of the delay coincidence data received in the set time period into the original data; the original data is instant coincidence data and delayed coincidence data received by the data acquisition link in the set time period.

acquiring an initial delay count value; judging whether delay coincidence data exist at any time in the set time period or not to obtain a data judgment result; and determining a delay count value of the delay conforming data received in the set time period according to the data judgment result and the initial delay count value.

if delay coincidence data exist at one moment, adding one to the initial delay count value to obtain a new delay count value, and determining the delay count value of the delay coincidence data according to the new delay count value; if there is no delayed coincidence data at another time, the delay count value of the delayed coincidence data is kept unchanged.

In one embodiment, the processor when executing the computer program further performs the steps of:

compensating the original data according to the delay count value of the delay coincidence data received in the set time period and the preset delay count threshold value, and determining the compensated original data; and carrying out image reconstruction according to the compensated original data to determine a PET image.

calculating the ratio of the delay count value of the received delay coincidence data in the set time period to the preset delay count threshold value; and compensating the original data according to the ratio, and determining the compensated original data.

judging whether the current time is the same as the end time of the set time period or not to obtain a time judgment result; and performing zero clearing operation on the delay count value of the delay coincidence data received in the set time period according to the time judgment result.

In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:

receiving delayed coincidence data of the PET detector within a set time period; the set time period comprises at least one moment; obtaining a delay count value corresponding to the delay coincidence data at the first moment according to the delay coincidence data; the delay count value is used for representing the number of delay coincidence data existing in the first time and the previous time in the set time period; according to the delay count value and a preset delay count threshold, performing packet loss processing on the delay coincidence data at the first time and the subsequent time within the set time period; the delay count threshold is related to the throughput of the data acquisition link to transmit and receive the immediate coincidence data and the delayed coincidence data.

In one embodiment, the computer program when executed by the processor further performs the steps of:

acquiring the maximum read-write speed of the data acquisition software, the maximum transmission speed of the data acquisition hardware and the maximum storage speed of the data storage hardware; and determining the delay count threshold according to the maximum read-write speed, the maximum transmission speed and the maximum storage speed.

if delay coincidence data exist at one moment, adding one to the initial delay count value to obtain a new delay count value, and determining the delay count value of the delay coincidence data according to the new delay count value; if there is no delayed coincident data at another time, the delay count value of the delayed coincident data is kept unchanged.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A PET coincidence data volume control method, characterized in that the method comprises:

receiving delayed coincidence data and instant coincidence data of the PET detector within a set time period; the set time period comprises at least one moment;

according to the delay count value and a preset delay count threshold, performing packet loss processing on the delay coincidence data at the first time and the subsequent time within the set time period; the delay count threshold is related to the throughput of the data acquisition link for transceiving the instant coincidence data and the delay coincidence data;

acquiring a delay count value of delay coincidence data received in the set time period;

writing the delay count value of the delay coincidence data received in the set time period into the original data; the original data is the instant coincidence data and the delayed coincidence data received in the set time period;

according to the delay count value of the delay coincidence data received in the set time period and the delay count threshold, compensating the original data and determining the compensated original data;

2. The method according to claim 1, wherein the performing packet loss processing on the delay coincidence data at the first time and the subsequent time within the set time period according to the delay count value and a preset delay count threshold comprises:

judging whether the delay count value is larger than the delay count threshold value or not to obtain a count value judgment result;

3. The method according to claim 2, wherein the performing packet loss processing on the delay coincidence data at the first time and the subsequent time within the set time period according to the count value determination result includes:

and if the delay count value is greater than the delay count threshold, performing packet loss processing on the delay coincidence data at the first time and the subsequent time in the set time period.

4. The method of any one of claims 1-3, wherein the data acquisition link comprises data acquisition software, data acquisition hardware, and data storage hardware, and wherein the delay count threshold is determined by:

and determining the delay counting threshold according to the maximum reading and writing speed, the maximum transmission speed and the maximum storage speed.

5. The method of claim 1, further comprising:

judging whether the current time is the same as the tail time of the set time period or not to obtain a time judgment result;

and clearing the delay count value of the delay coincidence data received in the set time period according to the time judgment result.

6. A PET coincidence data volume control device, the device comprising:

the receiving module is used for receiving delayed coincidence data and instant coincidence data of the PET detector within a set time period; the set time period comprises at least one moment;

the control module is used for performing packet loss processing on the delay coincidence data at the first moment and the subsequent moment in the set time period according to the delay count value and a preset delay count threshold; the delay count threshold is related to the throughput of the data acquisition link for transceiving the instant coincidence data and the delay coincidence data;

the data writing module is used for writing the delay count value of the delay coincidence data received in the set time period into the original data; the original data is the instant coincidence data and the delayed coincidence data received in the set time period;

the compensation module is used for compensating the original data according to the delay count value of the received delay coincidence data in the set time period and the delay count threshold value, and determining the compensated original data;

7. The apparatus of claim 6, wherein the control module comprises:

a count value judgment unit, configured to judge whether the delay count value is greater than the delay count threshold value, and obtain a count value judgment result;

8. The apparatus according to claim 7, wherein the control unit is specifically configured to perform packet dropping processing on the delay coincidence data at the first time and the subsequent time within the set time period if the delay count value is greater than the delay count threshold.

9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 5.

10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 5.