CN112164445A

CN112164445A - Storage method of PET (positron emission tomography) original data

Info

Publication number: CN112164445A
Application number: CN202011088376.4A
Authority: CN
Inventors: 李冠伟
Original assignee: Sinounion Healthcare Inc
Current assignee: Sinounion Healthcare Inc
Priority date: 2020-10-13
Filing date: 2020-10-13
Publication date: 2021-01-01

Abstract

The invention relates to a storage method of PET original data, which comprises the following steps: s1, acquiring original data in real time by the PET equipment, and acquiring the associated information of the original data acquired in real time; s2, storing the original data and the associated information collected in real time according to a preset data storage format; the preset data storage format comprises: header data corresponding to the original data, header data of each piece of associated information, the original data and the associated data; wherein the first header data each includes: the data length identifier is used for recording the length of the whole header data, and one information identifier corresponds to the header data information identifier of one piece of associated information; the nth header data includes: the data identifies the identifier. The method can provide a uniform data storage format to store the original data and related information, thereby realizing better identification and application of the original data in different versions.

Description

Storage method of PET (positron emission tomography) original data

Technical Field

The invention relates to a medical data storage technology, in particular to a storage method of PET (positron emission tomography) original data.

Background

PET (positron Emission tomography) is called positron Emission tomography, and nuclides capable of emitting positrons are used for marking compounds capable of participating in blood flow or metabolic processes of human tissues, so as to obtain images of human cross sections, coronary sections and sagittal sections.

A radionuclide labeled with a compound with a positron is injected into a subject before examination, and the positron emitted by the radionuclide moves about 1mm in the body and combines with a negative electron in the tissue to generate annihilation radiation, thereby generating two gamma photons with equal energy and opposite directions. The photons are acquired by the detection device, processed and finally converted into data of a fixed format, which is in practice referred to as PET raw data. The acquired original data are reconstructed by a software system of the PET equipment, and finally, a medical image which can be browsed by a doctor is generated.

In addition to generating medical images during hospital examinations, many necessary processes require raw data during the actual production of the device, including Normalization, NECR, NEMA, etc.

The acquired data is referred to as raw data, and during the acquisition process, the raw data also has many relevant information, including the type of nuclide, the nuclide generation time, the acquisition duration, etc., which are very important in practical applications. In addition to the need to process these data during acquisition, the data is stored and used later in research. The original data and the related information can be completely applied, so that how to conveniently acquire the information becomes critical.

With research and development and technology upgrade, the format of the original data will also change, and the analysis method of the software on the data will also change correspondingly. In practical applications, how to uniformly store original data and associated information of the original data becomes a technical problem which needs to be solved urgently at present.

Disclosure of Invention

Technical problem to be solved

In view of the above disadvantages and shortcomings of the prior art, the present invention provides a storage method of PET raw data, which is used to store data of each version uniformly, thereby realizing fast and portable identification and processing of information or related information in raw data.

(II) technical scheme

In order to achieve the purpose, the invention adopts the main technical scheme that:

in a first aspect, an embodiment of the present invention provides a method for storing PET raw data, where the method includes:

s1, acquiring original data in real time by the PET equipment, and acquiring the associated information of the original data acquired in real time;

s2, storing the original data and the associated information collected in real time according to a preset data storage format;

the preset data storage format comprises: header data corresponding to the original data, header data of each piece of associated information, the original data and the associated data;

wherein the first header data each includes: the data length identifier is used for recording the length of the whole header data, and one information identifier corresponds to the header data information identifier of one piece of associated information;

the nth header data includes: a data identification identifier; n is 2 or more.

Optionally, each data identification identifier has a length of 16 bytes, where the content of the first 11 bytes is a specific fixed identifier for identifying whether the data identification identifier is in a preset data storage format;

the ending character of each data identification identifier is \0.

Alternatively, the data length identifier has a length of 4 bytes after the data identification identifier is occupied, is used for recording the length of the header data, and is expressed in a 16-ary notation.

Optionally, the content identified by the information is identified by using a character string;

each header data information identification includes: information identification, information length and information content of the associated information;

the information identification of the associated information occupies 2 bytes, and the information length occupies 2 bytes.

In a second aspect, an embodiment of the present invention further provides a data processing method of PET raw data, including:

a1, receiving PET data transmitted by the PET equipment;

a2, identifying whether the data storage format of the PET data is a preset data storage format;

a3, if yes, acquiring original data and associated data in the PET data according to a preset data storage format of the PET data;

the nth header data includes: a data identification identifier; n is 2 or more.

the ending character of each data identification identifier is \0.

In a third aspect, an embodiment of the present invention further provides an electronic device, including: a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method for storing PET raw data according to any one of the first aspect above or implementing the method for processing PET raw data according to any one of the second aspect above.

In a fourth aspect, the embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the method for storing PET raw data according to any one of the above first aspects, or implements the method for processing PET raw data according to any one of the above second aspects.

(III) advantageous effects

The invention has the beneficial effects that: the method of the invention can provide a uniform data storage format to store the original data and the related information.

In the invention, the uniform data format is composed of an expandable head data and an original data, and the head data comprises all related information of the original data;

in the present invention, data generated by photon conversion in the PET apparatus is referred to as raw data. In order to conveniently store some related associated information of the original data, the original data is stored in a uniform data storage format, so that better identification and application of the original data in different versions can be realized.

Drawings

Fig. 1A is a flowchart of a method for storing PET raw data according to an embodiment of the present invention;

fig. 1B is a flowchart of a data processing method of PET raw data according to an embodiment of the present invention;

FIG. 2 is a schematic diagram showing the composition of PLST data according to an embodiment of the present invention;

FIG. 3 is a diagram showing the location of a data identifier in header data in PLST data according to an embodiment of the present invention;

FIG. 4 is a schematic diagram illustrating the data identifier of FIG. 3;

FIG. 5 is a schematic diagram of the location of the data length identifier in the header data of FIG. 2;

FIG. 6 is a diagram illustrating an example of length calculation of the length identifier in FIG. 5;

FIG. 7 is a diagram illustrating a method of representing the contents of the data length identifier of FIG. 5;

FIG. 8 is a schematic diagram of a PLST data format;

FIG. 9 is a schematic diagram of the components identified by the information in FIG. 8;

FIG. 10 is a schematic diagram of a manufacturer information identifier component;

fig. 11 is a schematic structural diagram of an electronic device.

Detailed Description

In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Example one

As shown in fig. 1A, the present embodiment provides a method for storing PET raw data, which specifically includes:

wherein the first header data each includes: the data length identifier is used for recording the length of the whole header data, and one information identifier corresponds to the header data information identifier of one piece of associated information; the nth header data includes: a data identification identifier; n is 2 or more.

Specifically, the content of the information identifier is identified by using a character string;

each header data information identification includes: information identification, information length and information content of the associated information; the information identification of the associated information occupies 2 bytes, and the information length occupies 2 bytes.

In practical application, the length of each data identification identifier is 16 bytes, wherein the content of the first 11 bytes is a specified fixed identifier for identifying whether the data identification identifier is in a preset data storage format;

the ending character of each data identification identifier is \0.

Further, the data length identifier has a length of 4 bytes after the data identification identifier is occupied, is used for recording the length of the header data, and is expressed in a 16-ary notation.

In order to conveniently store some related associated information of the raw data, the raw data is stored in a uniform data storage format, so that better identification and application of the raw data in different versions can be realized.

Example two

As shown in fig. 1B, the present embodiment provides a data processing method of PET raw data, which specifically includes:

a1, receiving PET data transmitted by the PET equipment;

the nth header data includes: a data identification identifier; n is 2 or more.

In the embodiment, the original data and the associated data in the PET data can be directly acquired according to the data storage format, so that various PET devices with different software versions can be used, and the data reading efficiency is improved.

EXAMPLE III

In order to better understand the data storage format in the present embodiment, the data storage format of PET data in the present embodiment is described below with reference to fig. 2 to 10.

1) The data format stored in the specified format is named PLST data.

2) As shown in fig. 2, the first part of the data is header data and the second part is original data, and in fig. 2 to 10, a gray background part represents the header data and a white background part represents the original data.

3) As shown in fig. 3, the 1 st to 16 th bytes in the header data are a data identification identifier, which occupies a length of 16 bytes.

The data identification identifier is used for distinguishing whether the PET raw data is stored in a specified format, and the content of the fixed identifier is a PET Listmode (PLST for short), wherein the PET Listmode occupies the length of 11 bytes, and the content of 12 th to 16 th bytes is \0.

Fig. 4 shows the stored content of a data identity identifier in PLST, the first line being the byte positions in PLST data and the second line being the stored content in PLST data. \0 identifies the end character of a string in the computer and fills in data without content.

Note that PLST is the name of the PET list mode data format, and is also the suffix name of the file when the file is stored.

After the computer program accesses the data, it reads the character string composed of the 1 st to 16 th bytes in the data, and judges whether the content of the character string is equal to "PET list mode". It should be noted that since "\ 0" identifies the end of a character string in a computer, reading the character string composed of the 1 st to 12 th bytes and reading the character string composed of the 1 st to 16 th bytes are the same content in the computer. If the interpretation results are equal, the data can be confirmed to be PLIST data; if the interpretation results are not equal, the data is not a PLST data.

As shown in fig. 5 and 6, the 17 th byte to the 20 th byte in the data is a data length identifier, 4 bytes represent an unsigned shaping number in the computer, and the number records the length of the whole header file, and the length ranges from 0 to 4294967295.

The computer directly obtains the unsigned shaped numbers converted from the 17 th byte to the 20 th byte, so that the computer can obtain that if the computer program analyzes the PLST data, the computer program does not need to query the information of the header file, and can directly access the following original data according to the length, as shown in fig. 6.

In fig. 6, the first row is the data attribute and the second row is the number of bytes occupied by the data. The data identifier occupies 16 bytes, the length identifier occupies 4 bytes, the other header data contents occupy 300 bytes, and it can be calculated that the content of the length identifier is 16+4+300 ═ 320, which indicates that the length of the entire header file is 320.

The 16-ary representation of 320 in 4 bytes is 0x 00000140. In fig. 7, the data length identifier content is represented in the data, the first row is the number of bytes in the data, and the second row is the content in the corresponding number of bytes.

5) PLST data starts at byte 21 and is identified by other header data information.

6) As shown in fig. 8, in actual use, the length of the collected data will exceed at least 100M, the content length of the header file will only occupy a very small part (less than 10K) of the whole data, and all the information identification contents are identified by using character strings.

7) As shown in fig. 9, all header information identifiers are composed of three parts: information ID + information length + information content.

The information ID marks the attribute of the information, and the meaning represented by the information can be known through the ID, wherein the information ID consists of 2 bytes; the number between 0x0000 and 0x8FFF in the information ID is a well-defined ID, i.e. a public ID. After the public ID definition is determined, it cannot be modified.

The number between 0x9000 and 0xFFFF in the information ID is the storage-side customized ID, i.e., a private ID.

The information length is composed of 2 bytes, the number of bytes occupied by a single information identifier is recorded, and the length range is 0-65535.

The information content is a character string in which information identifying the actual content is recorded. The maximum length of the information content is 60000. Shown in fig. 10 is the presentation of the manufacturer's information identifier in the data, the first row being the information attribute (0x1000), the second row being the number of bytes occupied (0x000D), and the third row being the content (Sinounion).

In fig. 10, the first two bytes represent the information ID, the content is 0x1000, and occupies 2 bytes, 0x1000 represents that the information ID is the manufacturer, and the content of the last 9 bytes is the Sinounion, which represents that the manufacturer is the Sinounion. The middle information length takes 2 bytes. The number of bytes occupied by the whole information identifier is 2+2+ 9-13. The content of the information length is 13. Corresponding to a 16-ary 0x 000D.

Table one defines some common information identification IDs.

Watch 1

By combining the information identification, the original data and the associated information in the PET data can be better acquired.

Example four

In this embodiment, a schematic structural diagram of an electronic device is provided, as shown in fig. 11, the electronic device shown in fig. 11 may include: at least one processor 71, at least one memory 72, at least one network interface 74, and/or other user interfaces 73. The various components in the electronic device are coupled together by a bus system 75. It will be appreciated that the bus system 75 is used to enable communications among the components. The bus system 75 includes a power bus, a control bus, and a status signal bus in addition to a data bus. For clarity of illustration, however, the various buses are labeled as bus system 75 in FIG. 11.

The electronic device of the present embodiment may perform the method shown in any of fig. 1A and 1B, wherein the user interface 73 may include a display, a keyboard, or a pointing device (e.g., a mouse or a touch pad, etc.).

It will be appreciated that the memory 72 in the present embodiment may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile memory may be a Read-only memory (ROM), a programmable Read-only memory (PROM), an erasable programmable Read-only memory (erasabprom, EPROM), an electrically erasable programmable Read-only memory (EEPROM), or a flash memory. The volatile memory may be a Random Access Memory (RAM) which functions as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (staticiram, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (syncronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM ), Enhanced Synchronous DRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), and direct memory bus RAM (DRRAM). The memory 72 described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

In some embodiments, memory 72 stores elements, executable units or data structures, or a subset thereof, or an expanded set thereof: an operating system 721 and application programs 722.

The operating system 721 includes various system programs, such as a framework layer, a core library layer, a driver layer, etc., for implementing various basic services and processing hardware-based tasks. The application 722 includes various applications, such as a media player (MediaPlayer), a Browser (Browser), and the like, for implementing various application services. Programs that implement methods in accordance with embodiments of the invention may be included within application 722.

In an embodiment of the present invention, the processor 71 is configured to execute the method steps provided in the first aspect by calling a program or an instruction stored in the memory 72, which may be, specifically, a program or an instruction stored in the application 722.

The method disclosed in the above embodiments of the present invention may be applied to the processor 71, or implemented by the processor 71. The processor 71 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 71. The processor 71 may be a general-purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software elements in the decoding processor. The software elements may be located in ram, flash, rom, prom, or eprom, registers, among other storage media that are well known in the art. The storage medium is located in a memory 72, and the processor 71 reads the information in the memory 72 and performs the steps of the above method in combination with hardware thereof.

It is to be understood that the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or any combination thereof. For a hardware implementation, the processing units may be implemented within one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), general purpose processors, controllers, micro-controllers, microprocessors, other electronic units designed to perform the functions described herein, or a combination thereof.

For a software implementation, the techniques described herein may be implemented by means of units performing the functions described herein. The software codes may be stored in a memory and executed by a processor. The memory may be implemented within the processor or external to the processor.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments provided in the present application, it should be understood that the execution sequence of the steps of the method embodiments can be arbitrarily adjusted unless there is an explicit precedence sequence. The disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or make a contribution to the prior art, or may be implemented in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the methods described in the embodiments of the present invention.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Those skilled in the art will appreciate that although some embodiments described herein include some features included in other embodiments instead of others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments.

Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A method for storing PET raw data, comprising:

the nth header data includes: a data identification identifier; n is 2 or more.

2. The method of claim 1, wherein:

each data identification identifier is 16 bytes in length, wherein the content of the first 11 bytes is a specified fixed identifier for identifying whether the data identification identifier is in a preset data storage format;

the ending character of each data identification identifier is \0.

3. The method of claim 1, wherein:

the length of the data length identifier is 4 bytes after the data identification identifier is occupied, and the data length identifier is used for recording the length of the header data and is expressed in a 16-ary system.

4. The method of claim 1, wherein the content identified by the information is identified using a character string;

5. A data processing method of PET raw data is characterized by comprising the following steps:

a1, receiving PET data transmitted by the PET equipment;

the nth header data includes: a data identification identifier; n is 2 or more.

6. The method of claim 5, wherein:

the ending character of each data identification identifier is \0.

7. The method of claim 5, wherein:

8. The method of claim 5, wherein the content identified by the information is identified using a character string;

9. An electronic device, comprising: memory, processor and computer program stored on the memory and executable on the processor, which computer program, when being executed by the processor, carries out the steps of the method for storing PET raw data according to one of the claims 1 to 4 or carries out the method for processing PET raw data according to one of the claims 5 to 8.

10. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the steps of the method for storing PET raw data according to one of the preceding claims 1 to 4, or carries out the method for processing PET raw data according to one of the preceding claims 5 to 8.