CN202196163U - Digitalize magnetic resonance imaging spectrometer based on PCI extensions for instrumentation (PXI)/PCI extensions for instrumentation express (PXIe) bus - Google Patents
Digitalize magnetic resonance imaging spectrometer based on PCI extensions for instrumentation (PXI)/PCI extensions for instrumentation express (PXIe) bus Download PDFInfo
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- CN202196163U CN202196163U CN2011203266028U CN201120326602U CN202196163U CN 202196163 U CN202196163 U CN 202196163U CN 2011203266028 U CN2011203266028 U CN 2011203266028U CN 201120326602 U CN201120326602 U CN 201120326602U CN 202196163 U CN202196163 U CN 202196163U
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Abstract
The utility model relates to a digitalize magnetic resonance imaging spectrometer based on a PCI extensions for instrumentation (PXI)/PCI extensions for instrumentation express (PXIe) bus, which is formed by a PXI machine box, a controller, a radio-frequency signal transmitting and receiving module and a gradient signal emitting module. The PXI/PXIe bus is contained in the PXI machine box, and the rear end of the controller is connected to the PXI/PXIe bus in the PXI machine box. The rear end of the radio-frequency signal transmitting and receiving module is connected with the PXI/PXIe bus, and the front end of the radio-frequency signal transmitting and receiving module is connected with an input end of a radio-frequency amplifier of a magnetic resonance imaging (MRI) device in radio-frequency output mode and connected with a radio-frequency output end of the MRI device in radio-frequency input mode. The rear end of the gradient signal emitting module is connected with the PXI/PXIe bus, and three gradient signals at the front end of the gradient signal emitting module are connected to an input end of a gradient amplifier of the MRI device. The digitalize magnetic resonance imaging spectrometer is designed based on the theory of modularized instrument and developed through field programmable gate array (FPGA), achieves digital frequency conversion through software, can accurately control carrier phase of radio-frequency signals, and meets the requirements of magnetic resonance imaging. The spectrometer has clear functional module, reduces complexity of hardware design, and represents development direction of novel spectrometers.
Description
Technical field
The utility model relates to a kind of magnetic resonance tool, especially a kind of Digital Spectrometer for Magnetic Resonance Imaging based on the PXI/PXIe bus.
Background technology
Magnetic resonance imaging (MRI) technology is a kind of ionising radiation that do not have, and can obtain the detection means of multi-faceted image, is used widely in industries such as medical treatment, chemical industry.Nuclear magnetic resonance spectrometer is that the signal in the MR imaging apparatus generates and processing unit.The major function of nuclear magnetic resonance spectrometer transmits and receives radio frequency (RF) signal, sends gradient signal, and the sequential of each signal, amplitude, phase place etc. are controlled, and analyzing and processing data also generates image.
The RF pulse of conventional magnetic resonance spectrometer and gradient pulse adopt simulation control, cause shortcomings such as spectrometer complex structure, system expensive, system flexibility difference, will be eliminated by market gradually.
PCI expansion (PXI) system towards instrument system is a kind of surveying instrument system platform of being accepted extensively by industry member.The PXI system is made up of PXI cabinet, controller and peripheral module.The PXI system adopts the PXI/PXIe bus, has special-purpose synchronous bus, and superior net synchronization capability can be provided.Peripheral module can adopt field programmable logic array (FPLA) (FPGA) integrated circuit board of supporting PXI flexibly, builds the surveying instrument towards various application.
Summary of the invention
For shortcomings such as the complex structure that overcomes the conventional magnetic resonance imaging spectrometer, system expensive, very flexible, the purpose of the utility model is to propose a kind of Digital Spectrometer for Magnetic Resonance Imaging based on the PXI/PXIe bus.This spectrometer adopts FPGA to generate radiofrequency signal and gradient signal based on the PXI system building.System realizes that based on software numeral goes up down coversion, has realized the accurate control of carrier phase, has simplified system architecture, has reduced simulation and has disturbed, and has made things convenient for system to revise and upgrading.
The Digital Spectrometer for Magnetic Resonance Imaging of the PXI/PXIe bus that the utility model proposes is made up of PXI cabinet 1, controller 2, radiofrequency signal transceiver module 3 and gradient signal generating module 4, and its structure is as shown in Figure 1.The PXI/PXIe bus is contained in PXI cabinet 1 inside, and controller 2 rear ends are connected to the PXI/PXIe bus of PXI cabinet 1; Radiofrequency signal transceiver module 3 rear ends connect the PXI/PXIe bus, and front radio-frequency output connects the radio frequency amplifier input end of MRI equipment, and the front radio-frequency input connects the RF output end of MRI equipment; Gradient signal transmitter module 4 rear ends connect the PXI/PXIe bus, and three gradient signal outputs of front end are connected to the gradient amplifier input end of MRI equipment.
In the utility model, the triggering line of the synchronous employing PXI/PXIe bus of intermodule, thus realized that intermodule signal precise time is synchronous.
In the utility model, down conversion module can the designated carrier phase place and reset on the numeral of radiofrequency signal, thereby can realize the accurate control of carrier phase.
In the utility model, the PXI/PXIe bus is contained in said PXI cabinet 1 inside, realizes the transmission of spectrometer system data, the transmission of trigger pip.
In the utility model, said controller 2 operation spectrometer control modules, the configuration that realizes systematic parameter, generation radio frequency transmissions and gradient transmit, analyze radio frequency receiving signal and generate image.
In the utility model; Said radiofrequency signal transceiver module 3 receives control order, baseband rf signal is carried out digital signal processing, emitting radio frequency signal, received RF signal, received RF signal is carried out digital signal processing, and gives controller with data upload.
In the utility model, said gradient signal generating module 4 receives control order, generates three road gradient signal waveforms and launches three road gradient signals.
The beneficial effect of the utility model is: adopt modular instrument to make up, system builds and flexible configuration; Adopt the PXI/PXIe bus to trigger, promoted the net synchronization capability of intermodule; Adopt frequency conversion, filtering, the resampling of FPGA realization signal, give full play to the advantage of software radio, make things convenient for the modification and the upgrading of system; Adopt down-conversion technique on the software numeral, guaranteed the accurate control of transmission and reception carrier phase place.
Description of drawings
Fig. 1 is the pie graph of the utility model spectrometer.
Fig. 2 is the signal processing flow figure among the utility model radio-frequency module FPGA.
Label among the figure: 1 is the PXI cabinet, and 2 is controller, and 3 is the radiofrequency signal transceiver module, and 4 is the gradient signal generating module.
Embodiment
Through specific embodiment the utility model is further specified below.
Embodiment 1: following each parts are connected by mode shown in Figure 1, and these those skilled in the art all can smooth implementation.PXI cabinet 1 adopts the PXIe-1062Q cabinet, and its core bus is the PXIe bus.Controller 2 adopts the PXIe-8130 controller.Radiofrequency signal transceiver module 3 adopts the combination of PXIe-7962R+NI-5781; Wherein PXIe-7962R is the FPGA module; Realize generation, filtering and the last down coversion of signal; NI-5781 is the adaptor module of PXIe-7962R, realizes the conversion of transmitting-receiving radiofrequency signal digital to analogy and analog to digital.Gradient signal generating module 4 adopts PXI-7854R, realizes the generation and the output of three gradient signals.
Radiofrequency signal transceiver module 3 concrete digital signal processing flow processs are as shown in Figure 2; The radio frequency baseband waveform has passed through finite impulse response (FIR) wave filter, cascaded integrator-comb (CIC) wave filter, Digital Up Convert (DUC) processing in the FPGA of PXIe-7962R, at last through digital-to-analogue conversion (DAC) back output among the NI-5781.After radio frequency receiving signal is changed (ADC) through analog digital among the NI-5781; In the FPGA of PXIe-7962R,, signal is uploaded to controller 2 carries out Flame Image Process through behind Digital Down Convert (DDC), cascaded integrator-comb (CIC) wave filter, finite impulse response (FIR) wave filter.
Claims (1)
1. Digital Spectrometer for Magnetic Resonance Imaging based on the PXI/PXIe bus; Form by PXI cabinet (1), controller (2), radiofrequency signal transceiver module (3) and gradient signal generating module (4); It is characterized in that PXI cabinet (1) inside contains the PXI/PXIe bus, controller (2) rear end is connected to the PXI or the PXIe bus of PXI cabinet (1); Radiofrequency signal transceiver module (3) rear end connects the PXI/PXIe bus, and front radio-frequency output connects the radio frequency amplifier input end of MRI equipment, and the front radio-frequency input connects the RF output end of MRI equipment; Gradient signal transmitter module (4) rear end connects the PXI/PXIe bus, and three gradient signal outputs of front end are connected to the gradient amplifier input end of MRI equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203266028U CN202196163U (en) | 2011-09-02 | 2011-09-02 | Digitalize magnetic resonance imaging spectrometer based on PCI extensions for instrumentation (PXI)/PCI extensions for instrumentation express (PXIe) bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203266028U CN202196163U (en) | 2011-09-02 | 2011-09-02 | Digitalize magnetic resonance imaging spectrometer based on PCI extensions for instrumentation (PXI)/PCI extensions for instrumentation express (PXIe) bus |
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| Publication Number | Publication Date |
|---|---|
| CN202196163U true CN202196163U (en) | 2012-04-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011203266028U Expired - Lifetime CN202196163U (en) | 2011-09-02 | 2011-09-02 | Digitalize magnetic resonance imaging spectrometer based on PCI extensions for instrumentation (PXI)/PCI extensions for instrumentation express (PXIe) bus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197269A (en) * | 2013-03-04 | 2013-07-10 | 宁波鑫高益磁材有限公司 | Full-digitalization multichannel one-board magnetic resonance imaging (MRI) spectrometer |
| CN103617145A (en) * | 2013-12-04 | 2014-03-05 | 包头市稀宝博为医疗系统有限公司 | User-defined bus and achievement method thereof |
-
2011
- 2011-09-02 CN CN2011203266028U patent/CN202196163U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197269A (en) * | 2013-03-04 | 2013-07-10 | 宁波鑫高益磁材有限公司 | Full-digitalization multichannel one-board magnetic resonance imaging (MRI) spectrometer |
| CN103617145A (en) * | 2013-12-04 | 2014-03-05 | 包头市稀宝博为医疗系统有限公司 | User-defined bus and achievement method thereof |
| CN103617145B (en) * | 2013-12-04 | 2016-03-30 | 包头市稀宝博为医疗系统有限公司 | A kind of self-defined bus and its implementation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120418 |