CN1361429A - Digital nuclear magnetic resonance receiver - Google Patents
Digital nuclear magnetic resonance receiver Download PDFInfo
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- CN1361429A CN1361429A CN 00128169 CN00128169A CN1361429A CN 1361429 A CN1361429 A CN 1361429A CN 00128169 CN00128169 CN 00128169 CN 00128169 A CN00128169 A CN 00128169A CN 1361429 A CN1361429 A CN 1361429A
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Abstract
The digital nuclear magnetic resonance receiver consists of mainly peripheral component interlinking bus (PCI), programmable logic array, universal digital signal processor, two-path orthogonal digital downwards frequency converting and extracting filter, two A/D converters and clock generating and distributing unit. The receiver can receive two input signals simultaneously while using one identical post-treatment and transmission module. Several of the receivers may operate parallely by means of the PCI, so that the system provides fast data transmission speed, high reliability and easy use.
Description
The present invention relates to nuclear magnetic resonance apparatus, more specifically relate to the digitizing receiving trap of nuclear magnetic resonance apparatus.
Receiver is the nuclear magnetic resonance apparatus essential important component.Recently, the someone has proposed digital quadrature detection technology (U.S. Rev.Sci.Inst., 1999,70,1511-1513), the single channel reference signal that radiofrequency signal and receiver local oscillator produce is carried out phase sensitive detection, is transformed to digital signal by analog/digital converter then.This signal is sent into behind the computing machine digital quadrature signal that produces with computing machine again and is carried out digital mixing, thereby obtains the digital signal of quadrature.There is following deficiency in this technology: 1, receiver has still used local oscillator and simulation detection technology, has influenced system signal noise ratio.2, receiver bandwidth is narrow, lacks high speed data transmission system, can't satisfy the requirement of hypervelocity data sampling.3, there is not the hyperchannel reception technique.Therefore, it is difficult to satisfy the requirement that modern magnetic resonance tool equipment interconnection is received machine.
The purpose of this invention is to provide a kind of digital nuclear magnetic resonance receiver, this device can receive the two-way input signal simultaneously, and use same aftertreatment and transport module, by external devices interconnect bus (PCI) but a plurality of identical receiving trap concurrent workings of interface, the system data transmission speed is fast, reliability is high, easy to use.
In order to achieve the above object, the present invention adopts following technical scheme:
A kind of digital nuclear magnetic resonance receiver, mainly take place to form with divider by external devices interconnect bus (PCI) interface, programmable logic array, nextport universal digital signal processor NextPort, two-way orthogonal digital down coversion and decimation filter, analog/digital converter and clock, principal feature is, two analog/digital converters have been adopted, can handle the two-way input signal simultaneously, and shared aftertreatment and transport module.When the more sampling channels of needs, a plurality of identical receiving traps can pass through the work of external devices interconnect bus (PCI) interface concurrent.
The input signal of receiver is from nuclear magnetic resonance apparatus receiving coil and the magnetic nuclear resonance radio frequency signal through amplifying.Nuclear magnetic resonance apparatus also provides synchronizing clock signals and receiving gate control signal for receiver.
After input signal is transformed to digital signal by analog/digital converter, sends into orthogonal digital down coversion and decimation filter and at first carry out The digital quadrature transformation.Signal after the conversion has not contained carrier frequency, but its streaming rate still the streaming rate with supplied with digital signal is identical, extract according to needed spectrum width by decimation filter then to be corresponding streaming rate.The data of decimation filter output are then carried out buffer memory in portion's storer within it by general digital processor (DSP), and can be further processed.By external devices interconnect bus (PCI) interface data through pci bus be transferred to sampling computing machine or principal computer thereafter.Programmable logic array mainly is responsible for address, the decoding of control signal and the buffering and the isolation of data bus, and pci interface is to the control of DSP and the DSP control to orthogonal transformation and decimation filter.
Consider that many input receivers are mainly used in the phased array nuclear magnetic resonance imaging system, in this case, all receivers receive signal and have identical frequency.When carrying out the digital quadrature frequency conversion, each passage only need use identical reference frequency, can a quadrature frequency-variable module of time-sharing multiplex and the processing module of all back.
In superconduction nuclear magnetic resonance imaging system, owing to also used oversampling technique simultaneously, very high to the message transmission rate requirement of system, adopt the pci interface technology of standard can fully satisfy this demand.Special-purpose pci interface chip is used to finish the conversion of interface signal.Use the pci interface technology can also allow a plurality of receiver module concurrent workings.
Because this programme has adopted high speed Analog-to-Digital Conversion Technology, orthogonal digital down-conversion technique, digital decimation filtering technique, high-speed digital signal treatment technology and pci bus interface technology, but have wide operating frequency range, high workload bandwidth, at a high speed, characteristics such as high precision and multi-channel parallel work, can satisfy of the technical requirement of magnetic resonance instrument and equipments such as modern NMR imaging instrument and nuclear magnetic resonance spectrometer to receiving system.
Compared with prior art, the present invention has following advantage: a, can receive the two-way input signal simultaneously.B, can shared aftertreatment and transport module, the economize on hardware resource reduces cost.But c, a plurality of identical receiving trap concurrent working, the system data transmission speed is fast, reliability is high, easy to use.
Fig. 1 is the digital nuclear magnetic resonance receiver structured flowchart.
Below in conjunction with accompanying drawing, the present invention is further illustrated.
The input signal of receiver is from nuclear magnetic resonance device receiving coil and the magnetic nuclear resonance radio frequency signal through amplifying.Nuclear magnetic resonance device also provides synchronizing clock signals and receiving gate control signal for receiver.
After input signal is transformed to digital signal by analog/digital converter, sends into orthogonal digital down coversion and decimation filter and at first carry out The digital quadrature transformation.Signal after the conversion has not contained carrier frequency, but its streaming rate still the streaming rate with supplied with digital signal is identical, extract according to needed spectrum width by decimation filter then to be corresponding streaming rate.The data of decimation filter output are then carried out buffer memory in portion's storer within it by general digital processor (DSP), and can be further processed.By external devices interconnect bus (PCI) interface data through pci bus be transferred to sampling computing machine or principal computer thereafter.Programmable logic array mainly is responsible for address, the decoding of control signal and the buffering and the isolation of data bus, and pci interface is to the control of DSP and the DSP control to orthogonal transformation and decimation filter.Clock takes place to provide clock with divider for each module.
Embodiment 1
The input signal of receiver is from nuclear magnetic resonance device receiving coil and the magnetic nuclear resonance radio frequency signal through amplifying.Nuclear magnetic resonance device also provides synchronizing clock signals and receiving gate control signal for receiver.
After input signal is transformed to digital signal by analog/digital converter, sends into orthogonal digital down coversion and decimation filter and at first carry out The digital quadrature transformation.Signal after the conversion has not contained carrier frequency, but its streaming rate still the streaming rate with supplied with digital signal is identical, extract according to needed spectrum width by decimation filter then to be corresponding streaming rate.The data of decimation filter output are then carried out buffer memory in portion's storer within it by general digital processor (DSP), and can be further processed.By external devices interconnect bus (PCI) interface data through pci bus be transferred to sampling computing machine or principal computer thereafter.Programmable logic array mainly is responsible for address, the decoding of control signal and the buffering and the isolation of data bus, and pci interface is to the control of DSP and the DSP control to orthogonal transformation and decimation filter.
Claims (2)
1, a kind of digital nuclear magnetic resonance receiver, this device is mainly taken place to form with divider by external devices interconnect bus (PCI), programmable logic array, nextport universal digital signal processor NextPort, two-way orthogonal digital down coversion and decimation filter, analog/digital converter and clock, it is characterized in that, two analog/digital converters have been adopted, can handle the two-way input signal simultaneously, and shared aftertreatment and transport module.
2, receiving trap according to claim 1 is characterized in that, by described external devices interconnect bus (PCI) interface, but identical receiving trap concurrent working.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00128169 CN1361429A (en) | 2000-12-28 | 2000-12-28 | Digital nuclear magnetic resonance receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00128169 CN1361429A (en) | 2000-12-28 | 2000-12-28 | Digital nuclear magnetic resonance receiver |
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| CN1361429A true CN1361429A (en) | 2002-07-31 |
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| CN 00128169 Pending CN1361429A (en) | 2000-12-28 | 2000-12-28 | Digital nuclear magnetic resonance receiver |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403715B (en) * | 2008-11-14 | 2011-11-09 | 中国科学院电工研究所 | Nano-upgrading sample nuclear magnetic resonance detection digital receiver |
| CN102662604A (en) * | 2012-03-06 | 2012-09-12 | 中国科学技术大学 | High speed data collection card for magnetic resonance system |
| CN106716165A (en) * | 2014-09-25 | 2017-05-24 | 皇家飞利浦有限公司 | Digital mri receiver coil with built-in received phase noise indicator |
| CN108872900A (en) * | 2018-07-02 | 2018-11-23 | 中国科学院武汉物理与数学研究所 | A kind of time division multiplexing nuclear magnetic resonance gradient number pre-emphasis apparatus |
-
2000
- 2000-12-28 CN CN 00128169 patent/CN1361429A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403715B (en) * | 2008-11-14 | 2011-11-09 | 中国科学院电工研究所 | Nano-upgrading sample nuclear magnetic resonance detection digital receiver |
| CN102662604A (en) * | 2012-03-06 | 2012-09-12 | 中国科学技术大学 | High speed data collection card for magnetic resonance system |
| CN102662604B (en) * | 2012-03-06 | 2015-06-24 | 中国科学技术大学 | High speed data collection card for magnetic resonance system |
| CN106716165A (en) * | 2014-09-25 | 2017-05-24 | 皇家飞利浦有限公司 | Digital mri receiver coil with built-in received phase noise indicator |
| CN106716165B (en) * | 2014-09-25 | 2020-01-07 | 皇家飞利浦有限公司 | Digital receiver coil with built-in receive phase noise indicator |
| CN108872900A (en) * | 2018-07-02 | 2018-11-23 | 中国科学院武汉物理与数学研究所 | A kind of time division multiplexing nuclear magnetic resonance gradient number pre-emphasis apparatus |
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