CN109387605B - Expandable multi-modality tomography system - Google Patents
Expandable multi-modality tomography system Download PDFInfo
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- CN109387605B CN109387605B CN201811071494.7A CN201811071494A CN109387605B CN 109387605 B CN109387605 B CN 109387605B CN 201811071494 A CN201811071494 A CN 201811071494A CN 109387605 B CN109387605 B CN 109387605B
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Abstract
The invention relates to a tomography system with an expandable modality, which comprises a main control module and single-modality tomography modules. The main control module bears the data communication function among the single-mode tomography modules and coordinates the data acquisition speed and the time sequence of each single-mode tomography module; each single-mode tomography module can be connected with a multi-mode control line through a multi-mode communication interface; the multi-mode control line is used for connecting the multi-mode main control chip and the control chip of each single-mode tomography module, and the multi-mode main control chip is used for transmitting state and instruction signals through the multi-mode control line, so that the working time sequence and the working speed of each single-mode tomography module are controlled, and data communication among the modes is coordinated; the multi-mode main control chip adopts an FPGA chip to read the level value on the state line, and sends a work starting instruction to each mode through an instruction line according to a programmed internal program to coordinate the work time sequence of each single-mode tomography module.
Description
Technical Field
The invention belongs to the technical field of measurement, and relates to a modal-extensible multi-modal tomography system, which can realize free combination and extension of different tomography modalities. The invention takes a multi-modal tomography system as a description object, but is not limited to the application, and the main control module and the control method are still applicable to measurement, control and other systems with multiple detection modes in coordination work in other industrial processes and chemical reactions.
Technical Field
The tomography technology has the characteristics of no disturbance, visualization and the like, can realize the detection of the distribution parameters of the complex flowing medium, and has wide application value in the fields of petroleum, chemical engineering, metallurgy, power, energy and other industrial fields, visual test and monitoring of the multiphase flow process, biology, medical treatment and the like. The basic principle of tomography is that a space sensitive sensor array is adopted to detect the distribution parameters of a sensitive field and acquire two-dimensional or three-dimensional distribution information capable of describing a detected region.
Common tomographic imaging modalities include electrical, ultrasound, and radiation, each with its specific physical sensitivity parameters. For complex measured media, a multimode fusion measurement method is often adopted, and a measurement method using one mode often cannot comprehensively reflect the actual situation. For example, for the tomography of oil-gas-water three-phase flow, a tomography method of fusion of two modes of electricity and ultrasound is often adopted. Electricity and ultrasound are used as two process tomography technologies based on different physical principles, the application range and the imaging characteristics of the two technologies are different, an ultrasonic field has a hard field characteristic and has advantages in identifying a phase interface, and an electric field is a soft field and has higher sensitivity to a position close to an electrode. Thus, the ultrasonically and electrically sensitive field distributions have some complementarity. Both the electrical sensor and the ultrasonic sensor have the advantages of low cost, good safety, no radiation, no disturbance, quick response and the like, and have great potential in the aspects of online visualization and parameter measurement of multiphase flow.
Existing multi-modality tomography systems often employ a fixed modality combination, which has several disadvantages. Firstly, the system can only be suitable for a specific measured medium, and once the measured medium changes or the sensitive field distribution parameters of the measured medium change, the original multi-mode system cannot be suitable. Secondly, the modes can not be flexibly expanded and any combination among the multiple modes can not be realized, and if more modal information is required to be acquired, the multi-mode tomography system can only be redesigned.
Disclosure of Invention
The invention aims to provide a multi-mode tomography system with expandable and combinable modes, so that different modes can not interfere with each other and can carry out continuous measurement according to a certain working time sequence. The invention improves the defects of the original multi-mode system, can realize the mutual communication among different modes, and can uniformly coordinate the working time sequences and the working rates of the different modes. The technical scheme of the invention is as follows:
a tomography system with expandable modality comprises a main control module and single-modality tomography modules. Wherein the content of the first and second substances,
the main control module is used for bearing the data communication function among the single-mode tomography modules and coordinating the data acquisition speed and the time sequence of each single-mode tomography module, and comprises a multi-mode main control chip and a matched circuit thereof, a multi-mode control line and a multi-mode communication interface; the multi-mode control line comprises an instruction line and a state line which are paired, and the instruction line is used for the multi-mode main control chip to send a working starting instruction signal to each single-mode tomography module; the state lines are used for sending the current working state of each single-mode tomography module to the multi-mode main control chip by each single-mode tomography module, and each pair of instruction lines and state lines are only connected with one single-mode tomography module;
each single-mode tomography module can be connected with the multi-mode control line through the multi-mode communication interface, each single-mode tomography module is provided with a uniform mode communication interface, and the interface comprises a pair of state lines and instruction lines and a group of data lines, wherein the state lines and the instruction lines are respectively connected with the pair of state lines and the instruction lines of the multi-mode control line; the data line is used for transmitting measurement data to the upper computer by each single-mode tomography module, is directly connected with the upper computer, has a plurality of data bits, transmits data format and meaning, is defined by each single-mode tomography module, and has data acquisition rate determined by the clock rate of each single-mode tomography module;
the multi-mode control line is used for connecting the multi-mode main control chip and the control chip of each single-mode tomography module, and the multi-mode main control chip is used for transmitting state and instruction signals through the multi-mode control line, so that the working time sequence and the working speed of each single-mode tomography module are controlled, and data communication among the modes is coordinated;
the multimode main control chip adopts an FPGA chip to read a level value on a state line, sends a work starting instruction to each mode through an instruction line according to a programmed internal program, coordinates the work time sequence of each single-mode tomography module, is realized through a finite state machine, and sequentially performs according to a preset state transition diagram: the finite-state machine reads the state lines of the single-mode tomography modules in real time, and stores the level values into an external input register of the finite-state machine as the current external input of the finite-state machine; when a program is started, initializing the current state and storing the current state mark into a state register of a finite state machine; when the FPGA clock is refreshed, the finite state machine reads the level values stored in the external input register and the state register of the finite state machine, and determines the level value to be output by each modal instruction line at the next moment according to the programmed program in the chip and the requirement of a time sequence conversion chart.
The invention has the following beneficial effects and advantages:
1. the multi-modal tomography module adopts a unified communication interface and a control line, so that the master control module can coordinate various modalities conveniently;
2. the multiple single-mode tomography modules can be freely expanded, namely, the modes can be freely increased, decreased or combined;
3. the main control chip uses the FPGA, the system flexibility is high, and when the mode scheme is changed, a new program of the main control chip can be downloaded to adapt to a new multi-mode combined working scheme;
4. the reconstruction cost of the single-mode tomography system is low, and only a multi-mode control line and a corresponding interface are needed to be added to the original system.
Drawings
The following figures, which are exemplary, not exhaustive or limiting, describe selected embodiments of the invention, wherein:
FIG. 1 is a block diagram of the system as a whole according to an embodiment of the present invention; wherein, the 0-multi-mode control line, the 1-multi-mode main control module and the 2-data line
FIG. 2 is a structural diagram of the connection mode of the multi-mode control line of the device of the present invention, wherein 1-a multi-mode main control module; 3-an instruction line; 4-state line; 5-line connection node; 6-a multimodal communication interface;
FIG. 3 is a timing diagram of a control scheme of the apparatus of the present invention;
Detailed Description
The steps for making and operating the present invention are intended to be described as embodiments of the invention, and not as the only forms in which the present invention may be made and utilized, other embodiments that perform the same function, and are intended to be included within the scope of the present invention. The multiple different modes in the present invention include electrical ultrasound, etc., and several electrical or ultrasound measurement modes can be used simultaneously.
The following describes embodiments of the present invention in detail with reference to the drawings.
Fig. 1 depicts the overall system architecture of the apparatus of the present invention, comprising a 1-multimodal master control module and individual modality-independent modules. The 1-multi-mode main control module can be further divided into a multi-mode main control chip, a 0-multi-mode control line and a multi-mode communication interface, and in this embodiment, the mode 1, the mode 2 and the mode 3 are exemplified by ERT, ECT and UPT, respectively. The multimode main control chip is positioned on a single main control circuit board, the circuit board is provided with a multimode communication interface, one end of the interface is connected to the multimode main control chip through a multimode control line, and the other end of the interface can be connected with an external circuit board. In this embodiment, the multi-modal communication interface is, for example, a J3 interface of the CPCI standard, and the main control circuit board can be connected to each modal tomography system located on the front panel through the bidirectional pins of the backplane of the CPCI chassis. 2-data line for transmitting measured data to upper computer in each mode
FIG. 2 is a block diagram showing the connection mode of the multi-mode control line of the apparatus of the present invention.
The multi-mode main control module is used as an independent module and is connected with the main control chip of each mode. Functionally, the main control module and each measuring module are connected through an independent state line and an independent instruction line, each state line or each instruction line occupies a 1-bit data channel, and 2 data channels are added for each mode. If the total number of the modes is N, because each mode occupies two data channels, pins of the data channels which are reserved for multi-mode communication by the FPGA chip are not less than 2N, and the number of the data channels contained in the multi-mode communication interface is not less than 2N. In the system structure, two control lines of each mode are led out to a multi-mode communication interface through a multi-mode main control chip FPGA pin, and then are led into each independent tomography system.
The state lines and the instruction lines always appear in pairs, the interfaces corresponding to each pair of the state lines and the instruction lines on the main control module are connected with the communication interface of a specific single-mode imaging module, each mode state line and each instruction line are exclusive, two ends of the same state line or each instruction line are only connected with the multi-mode main control chip and the control chip of the single-mode tomography module, and other nodes are not connected in the middle, for example, the 3-instruction line and the 4-state line of the mode 1 in fig. 2 are not shared with the 3-instruction line and the 4-state line of other modes. The connection between the multi-mode control wire channel reserved on the main control chip and the main control chip FPGA is fixed and can not be modified.
A multi-modal control line always contains multiple sets of paired state and instruction lines, one for each mode. For the tomography system with the expandable mode, the expansion of the mode is realized on the expandability of a multi-mode control line. The step of extending a new modality can be divided into: step one, a main control module FPGA program starts a pair of reserved interfaces of a state line and an instruction line; secondly, adding the single-mode tomography module into an existing extended-mode tomography system, namely correspondingly connecting corresponding state lines and instruction lines; and step three, modifying the FPGA program of the single-mode tomography module to be controlled by the FPGA chip of the main control module, and modifying the FPGA program of the main control module to enable the state transition diagram to contain the relevant working state of the newly added mode.
FIG. 3 is a timing diagram of the control scheme of the apparatus of the present invention. The function of the instruction line is that the main control module sends a work starting instruction to each measuring module, the default value is low level 0, the rising edge is effective, the function of the state line is that the measuring module feeds back the current working state to the main control module, the current non-working is low level 0, and the current working is high level 1.
In this embodiment, three modes are taken as an example, the mode 1, the mode 2 and the mode 3 are taken as ERT, ECT and UPT, respectively, and according to the working principle of the three modes, the working logic is that the mode 1 and the mode 2 work alternately, and the mode 3 works continuously. The method comprises the following basic steps: firstly, when the main control module is powered on, firstly, a pulse trigger signal is sent to a communication interface connected with a mode 1 and a mode 3 through the instruction line; step two, after receiving the instruction signal, the mode 3 starts to work continuously; step three, after receiving the instruction signal, the mode 1 starts working for a complete measurement period, and continuously sends a high-level state signal to the multi-mode main control chip through the state line during the working period until a complete measurement period is finished and the low level is recovered; step four, after receiving the low level signal sent by the mode 1 state line, the master control module judges that the mode 1 has finished working for a period, and at the moment, the master control module sends a pulse trigger signal to the mode 2 instruction line; step five, after receiving the instruction signal, the mode 2 starts working for a complete measurement period, and during the working period, a high-level state signal is continuously sent to the multi-mode main control chip through the state line of the mode 2 until a complete measurement period is finished and a low level is recovered; step six, after receiving a low level signal sent by a mode 2 state line, the master control module judges that the mode 2 has finished working for one cycle, and at the moment, the master control module sends a pulse trigger signal to a mode 1 instruction line; and step seven, repeating the steps three to six to finish the alternate work of the mode 1 and the mode 2.
Claims (2)
1. A tomography system with expandable modality comprises a main control module and each single-modality tomography module, wherein,
the main control module is used for bearing the data communication function among the single-mode tomography modules and coordinating the data acquisition speed and the time sequence of each single-mode tomography module, and comprises a multi-mode main control chip and a matched circuit thereof, a multi-mode control line and a multi-mode communication interface; the multi-mode control line comprises an instruction line and a state line which are paired, and the instruction line is used for the multi-mode main control chip to send a working starting instruction signal to each single-mode tomography module; the state lines are used for sending the current working state of each single-mode tomography module to the multi-mode main control chip by each single-mode tomography module, and each pair of instruction lines and state lines are only connected with one single-mode tomography module;
each single-mode tomography module is connected with the multi-mode control line through a multi-mode communication interface, each single-mode tomography module is provided with a uniform mode communication interface, and the interface comprises a pair of state lines and instruction lines and a group of data lines, wherein the state lines and the instruction lines are respectively connected with the pair of state lines and the instruction lines of the multi-mode control line; the data line is used for transmitting measurement data to the upper computer by each single-mode tomography module, is directly connected with the upper computer, has a plurality of data bits, transmits data format and meaning, is defined by each single-mode tomography module, and has data acquisition rate determined by the clock rate of each single-mode tomography module;
the multi-mode control line is used for connecting the multi-mode main control chip and the control chip of each single-mode tomography module, and the multi-mode main control chip is used for transmitting state and instruction signals through the multi-mode control line, so that the working time sequence and the working speed of each single-mode tomography module are controlled, and data communication among the modes is coordinated;
the multimode main control chip adopts an FPGA chip to read a level value on a state line, sends a work starting instruction to each mode through an instruction line according to a programmed internal program, coordinates the work time sequence of each single-mode tomography module, is realized through a finite state machine, and sequentially performs according to a preset state transition diagram: the finite-state machine reads the state lines of the single-mode tomography modules in real time, and stores the level values into an external input register of the finite-state machine as the current external input of the finite-state machine; when a program is started, initializing the current state and storing the current state mark into a state register of a finite state machine; when the FPGA clock is refreshed, the finite state machine reads the level values stored in the external input register and the state register of the finite state machine, and determines the level value to be output by each modal instruction line at the next moment according to the programmed program in the chip and the requirement of a time sequence conversion chart.
2. The scalable modality tomography system of claim 1, wherein the start-of-operation command sent by the command line of the multi-modality control line is a single pulse with a rising edge active, and a current operating status is sent with a high level indicating current operation and a low level indicating current cessation of operation.
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| US7254438B2 (en) * | 2001-10-19 | 2007-08-07 | Koninklijke Philips Electronics N.V. | Multimodality medical imaging system and method with intervening patient access area |
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