CN103054583B - Patient bed control device and method for reducing noises of images of magnetic resonance imaging (MRI) system - Google Patents
Patient bed control device and method for reducing noises of images of magnetic resonance imaging (MRI) system Download PDFInfo
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- CN103054583B CN103054583B CN201210581235.5A CN201210581235A CN103054583B CN 103054583 B CN103054583 B CN 103054583B CN 201210581235 A CN201210581235 A CN 201210581235A CN 103054583 B CN103054583 B CN 103054583B
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- 238000002595 magnetic resonance imaging Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000005611 electricity Effects 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000005481 NMR spectroscopy Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
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Abstract
The invention provides a patient bed control device and a method for reducing noises of images of a magnetic resonance imaging (MRI) system. The patient bed control device comprises a front solid-state relay, a frequency converter, a horizontal solid-state relay, a vertical solid-state relay and a main control unit, wherein the front solid-state relay is arranged between a constant-voltage and constant-frequency alternating current power supply and the frequency converter on a circuit, the horizontal solid-state relay is arranged between the frequency converter and a patient bed horizontal motor on the circuit, the vertical solid-state relay is arranged between the frequency converter and a patient bed vertical motor on the circuit, and the main control unit is respectively and electrically connected with the front solid-state relay, the frequency converter, the horizontal solid-state relay and the vertical solid-state relay and used for controlling the front solid-state relay, the frequency converter, the horizontal solid-state relay and the vertical solid-state relay. The method includes de-energizing the frequency converter in the patient bed control device before MRI scanning is performed to patients, so that bright spots and lines on the MRI images, which are caused by the noises of the frequency converter, can be eliminated.
Description
Technical field
The present invention relates to the instrument for radiodiagnosis, specifically, relate to a kind of patient bed control device for MRI system image noise reduction and method.
Background technology
Nuclear magnetic resonance (Magnetic Resonance Imaging, MRI) also NMR (Nuclear Magnetic Resonance)-imaging is claimed, be the FA modern medicine imaging technique of one produced along with the development of cryogenic technique, superconductor technology, magnet technology, electronic technology and computer technology, be widely used in big-and-middle-sized hospital.
Human body about 70% is made up of water, and each hydrone has two protons (i.e. proton).When human body is placed in high-intensity magnetic field, in human body, the spin of a part of proton can along the direction orientation of this high-intensity magnetic field.Now, human body is irradiated with suitable radio frequency electromagnetic (namely there is the electromagnetic wave of resonant frequency), the spin of the proton along described high-intensity magnetic field direction orientation can be made to reverse, and after having cancelled this radio frequency electromagnetic, the proton that spin there occurs reversion can return to original state, namely return to the state of spin along described high-intensity magnetic field direction orientation, give off the photon (i.e. magnetic resonance signal) of certain energy simultaneously.The intensity of these photons is relevant with proton density, and the moisture content of various tissue is different in human body, namely the density of contained proton is different, therefore, by detecting and analyzing the Energy distribution of the photon that these protons give off, just by various tissue separately, thus the accurate stereo-picture of inside of human body can be obtained.Further, if superpose suitable gradient magnetic on described uniform high-intensity magnetic field, then the spatial resolution of obtained image can greatly be improved.
MRI system generally comprises superconducting magnet subsystem, gradient subsystem, Radio Frequency Subsystem, Computer Image Processing subsystem, patient bed and control device etc.Wherein, superconducting magnet subsystem can provide uniform high-intensity magnetic field; Gradient subsystem can produce the suitable gradient magnetic be superimposed upon on described uniform strong magnetic field; Radio Frequency Subsystem can produce short and strong radio-frequency electromagnetic pulse, receives the magnetic resonance signal of human body generation and export the analog electrical signal corresponding with it; Computer Image Processing subsystem converts the analogue signal that Radio Frequency Subsystem exports to digital signal, draws the view data of aspect, and demonstrate the image of observation aspect by different tonal gradations according to the corresponding relation of itself and each voxel of anthroposcopy aspect; Patient bed and control device is then for moving to patient in described magnetic field to scan.
Patient bed control device moves patient bed by controlling rotating and reverse of patient bed horizontal motor and patient bed motor vertical, makes the position to be scanned of patient accurately arrive precalculated position.
Fig. 1 is circuit diagram, and one that shows existing patient bed control device simplifies circuit structure.As shown in Figure 1, the patient bed control device of existing one includes but not limited to: converter 10, low pass filter 20, horizontal solid-state relay 30, vertical solid-state relay 40 and main control unit 50.The input of converter 10 is electrically connected with constant voltage constant frequency alternating current power supply 200, the outfan of converter 10 is electrically connected with the input of low pass filter 20, the outfan of low pass filter 20 is electrically connected with patient bed horizontal motor 301 by horizontal solid-state relay 30, the outfan of low pass filter 20 is also electrically connected with patient bed motor vertical 302 by vertical solid-state relay 40, main control unit 50 is electrically connected with vertical solid-state relay 40, in order to control it with converter 10, horizontal solid-state relay 30 respectively.
Converter 10 is a kind of devices voltage and the changeless alternating current of frequency (alternating current of such as 220V/50Hz) being converted to the alternating current of voltage or changeable frequency.Under the control of main control unit 50 (as shown in the dotted line 11 in Fig. 1), the alternating current of the voltage that alternating current power supply 200 provides by converter 10 and frequency-invariant is converted to the alternating current of voltage or frequency-adjustable.When the alternating current of voltage or frequency-adjustable is supplied to motor, the rotating speed of motor is just thereupon adjustable.
Low pass filter 20 is used for suppressing the high-frequency noise in the alternating current that exports of converter 10.
Horizontal solid-state relay 30 is a kind of noncontacting switches with vertical solid-state relay 40, keeps the state of " leading to " or " breaking " under the control (as shown in the dotted line 31 in Fig. 1 and dotted line 41) of main control unit 50.When horizontal solid-state relay 30 is in the state of " leading to ", the voltage that low pass filter 20 exports or the alternating current of frequency-adjustable will be applied on patient bed horizontal motor 301, thus make patient bedly to move in the controlled mode of speed and direction in the horizontal direction.In like manner, when vertical solid-state relay 40 is in the state of " leading to ", the voltage that low pass filter 20 exports or the alternating current of frequency-adjustable will be applied on patient bed motor vertical 302, thus make patient bedly to move in the controlled mode of speed and direction in vertical direction.When horizontal solid-state relay 30 or vertical solid-state relay 40 are in the state of " breaking ", correspondingly, patient bed horizontal motor 301 or patient bed motor vertical 302 just stop operating.
It is an interference source that the operation principle of the converter 10 in existing patient bed control device determines it to weak electric signal.When converter 10 powers on, even without electric current output, (namely horizontal solid-state relay 30 disconnects with vertical solid-state relay 40, patient bed horizontal motor 301 and patient bed motor vertical 302 stop operating), also can find with after near field probes test, have the noise of 0 ~ 40MHz in the port of converter 10, its intensity is about 70mdB.Because the magnetic resonance signal of MRI system is extremely faint, therefore, the noise of converter 10 conciliates the raw very large interference of division to the reception of magnetic resonance signal, thus cause occurring bright line or bright spot on MRI image, these bright lines or bright spot can reduce the signal to noise ratio of image, thus cause the reception of magnetic resonance signal or the failure of parsing or cause doctor to the erroneous judgement of image.
In order to the impact that the noise reducing converter 10 produces each equipment in MRI system, usually at input and the outfan installation magnet ring of converter 10, to absorb the high-frequency noise of the port of converter 10, but the intensity of noise in 0 ~ 5MHz frequency range is still about 70mdB.In addition, high-frequency noise in the alternating current that low pass filter 20 can suppress converter 10 to export is set, the collection of the noise jamming magnetic resonance signal in the forceful electric power of the driving three phase electric machine exported to prevent converter 10 and parsing and disturb the normal work of other device.Moreover, the metal protective case ITT adapter that 360 ° can be adopted to shield at the seam of the interlock circuit of converter 10.But the interference that the noise that above-mentioned measure still can not eradicate converter 10 is completely formed MRI image.
Summary of the invention
The present invention is to solve the above-mentioned technical problem that exists in prior art and making, its object is to provide a kind of patient bed control device for MRI system image noise reduction and method, to eradicate bright line or bright spot that noise that the converter in the patient bed control device of MRI system produces causes in MRI image completely, thus reduce the noise of MRI image, improve the quality of MRI image.
To achieve these goals, according to an aspect of the present invention, a kind of patient bed control device for MRI system image noise reduction is provided, it comprises: preposition solid-state relay, converter, horizontal solid-state relay, vertical solid-state relay and main control unit, wherein, described preposition solid-state relay is arranged between constant voltage constant frequency alternating current power supply and described converter on circuit, described horizontal solid-state relay is arranged between described converter and patient bed horizontal motor on circuit, described vertical solid-state relay is arranged between described converter and patient bed motor vertical on circuit, described main control unit respectively with described preposition solid-state relay, described converter, described horizontal solid-state relay and described vertical solid-state relay electrical connection, for controlling it.
Preferably, the above-mentioned patient bed control device for MRI system image noise reduction can also comprise low pass filter, and this low pass filter is arranged on the outfan of described converter on circuit, for carrying out low-pass filtering to the output of described converter.
According to a further aspect in the invention, provide a kind of method for MRI system image noise reduction, the method comprises: a) use above-mentioned patient bed control device to control patient bedly to move to precalculated position; B) before MRI scanning is carried out to patient, the converter dead electricity in described patient bed control device is made; C) MRI scanning carried out to patient and obtain MRI image.
Preferably, in the above-mentioned methods, Ke Yishi, described main control unit is electrically connected with MRI scanning element, when described main control unit receives MRI scan instruction, first automatically controls described preposition solid-state relay and disconnects, then control described MRI scanning element and scan.
From describing and putting into practice above, in patient bed control device provided by the present invention, be provided with preposition solid-state relay at the input of converter, thus can by this preposition solid-state relay control converter electric and dead electricity.When converter no-output, converter dead electricity can be made, thus the noise of converter is disappeared, to eliminate the impact that converter noise normally works on each equipment in MRI system.Particularly, before MRI scanning is carried out to patient, make converter dead electricity, the bright line in MRI image and bright spot can be eliminated, increase the signal to noise ratio of MRI image, improve the quality of MRI image.
Accompanying drawing explanation
By reference to the content below in conjunction with the description of the drawings and claims, other object of the present invention and result will be understood and easy to understand more.In the accompanying drawings:
Fig. 1 is circuit diagram, and one that shows existing patient bed control device simplifies circuit structure;
Fig. 2 is circuit diagram, and one that shows the patient bed control device for MRI system image noise reduction described in one embodiment of the present of invention simplifies circuit structure; And
Fig. 3 is block diagram, shows the method for MRI system image noise reduction described in one embodiment of the present of invention.
Label identical in all of the figs indicates similar or corresponding feature or function.
Detailed description of the invention
In the following description, for purposes of illustration, in order to provide the complete understanding to one or more embodiment, many details have been set forth.But, clearly, also these embodiments can be realized when there is no these details.In other example, one or more embodiment for convenience of description, known structure and equipment illustrate in block form an.
Describe of the present invention for the patient bed control device of MRI system image noise reduction and the embodiment of method below with reference to accompanying drawings.
Fig. 2 is circuit diagram, and one that shows the patient bed control device for MRI system image noise reduction described in one embodiment of the present of invention simplifies circuit structure.As shown in Figure 2, the patient bed control device for MRI system image noise reduction described in one embodiment of the present of invention comprises: preposition solid-state relay 60, converter 10, horizontal solid-state relay 30, vertical solid-state relay 40 and main control unit 50, wherein, preposition solid-state relay 60 is arranged between constant voltage constant frequency alternating current power supply 200 and converter 10 on circuit, horizontal solid-state relay 30 is arranged between converter 10 and patient bed horizontal motor 301 on circuit, vertical solid-state relay 40 is arranged between converter 10 and patient bed motor vertical 302 on circuit, main control unit 50 respectively with preposition solid-state relay 60, converter 10, horizontal solid-state relay 30 is electrically connected with vertical solid-state relay 40, for controlling it.In addition, in the present embodiment, preferably, patient bed control device also comprises low pass filter 20, and low pass filter 20 is arranged on the outfan of converter 10 on circuit, for carrying out low-pass filtering to the output of converter 10.
In other words, patient bed control device involved by one embodiment of the present of invention, except comprising converter 10, low pass filter 20, horizontal solid-state relay 30, vertical solid-state relay 40 and the main control board 50 in the existing patient bed control device shown in Fig. 1, also comprises preposition solid-state relay 60.The input of converter 10 is electrically connected with constant voltage constant frequency alternating current power supply 200 by preposition solid-state relay 60, and preposition solid-state relay 60 also controls, as shown in the dotted line 61 in Fig. 2 by main control unit 50.Preposition solid-state relay 60 is equivalent to a controlled switch, main control unit 50 by the on off operating mode controlling preposition solid-state relay 60 control converter 10 electric and dead electricity.
Inventive concept of the present invention is, when MRI system is started working, controls the conducting of preposition solid-state relay 60 by main control unit 50, thus it is electric that converter 10 is obtained.Then or simultaneously, can by main control unit 50 level of control solid-state relay 30 or vertical solid-state relay 40 conducting, thus drive patient bed horizontal motor 301 or patient bed motor vertical 302, make patient bed can carry out expecting horizontal movement or move both vertically.
When after patient bed arrival preposition, before starting that MRI scanning is carried out to patient, control preposition solid-state relay 60 by main control unit 50 and disconnect, thus make converter 10 dead electricity.Then, then to patient carry out MRI scanning.Owing to carrying out in the process of MRI scanning to patient, converter 10 is dead electricity, therefore, any converter noise would not be had to affect collection and the parsing of the magnetic resonance signal in MRI scanning process, thus fundamentally eradicated bright line or bright spot that noise that converter 10 produces causes in MRI image.
Fig. 3 is block diagram, shows the method for MRI system image noise reduction described in one embodiment of the present of invention.According to above describe and as shown in Figure 3, the method for MRI system image noise reduction described in one embodiment of the present of invention comprises the steps: in step S410, and the patient bed control device control using the invention described above to provide is patient bed moves to precalculated position; In the step s 420, before MRI scanning is carried out to patient, make the converter dead electricity in this patient bed control device; In step S430, MRI scanning is carried out to patient and obtains MRI image.
In the above-mentioned methods, before carrying out MRI scanning, preposition solid-state relay 60 can be controlled separately and disconnect, to make converter 10 dead electricity.
In other embodiments, also can be that main control unit 50 is electrically connected with MRI scanning element (not shown), when main control unit 50 receives MRI scan instruction, first automatically control preposition solid-state relay 60 to disconnect, then control described MRI scanning element and scan.In this case, surface is seen, operator is the same with to the operation of former MRI system to the operation of the MRI system in the present invention, but this MRI system is automatically disconnected preposition solid-state relay before MRI scanning, thus makes converter 10 dead electricity.That is to say, converter power-off can be completed and MRI scans two actions when performing scan instruction, therefore just simplify the operation of operator.
From describing and putting into practice above, in patient bed control device provided by the present invention, be provided with preposition solid-state relay at the input of converter, thus can by this preposition solid-state relay control converter electric and dead electricity.When converter no-output, converter dead electricity can be made, thus the noise of converter is disappeared, thus eliminate the impact that converter noise normally works on each equipment in MRI system.Particularly, before MRI scanning is carried out to patient, make converter dead electricity, the bright line in MRI image and bright spot can be eliminated, increase the signal to noise ratio of MRI image, improve the quality of MRI image.
To be shown specifically and the preferred embodiment described discloses the present invention although combined, but those skilled in the art are to be understood that, the patient bed control device for MRI system image noise reduction proposed for the invention described above and method, can also make various improvement on the basis not departing from content of the present invention.Therefore, protection scope of the present invention should be determined by the content of appending claims.
Claims (4)
1. the patient bed control device for MRI system image noise reduction, comprise: preposition solid-state relay, converter, horizontal solid-state relay, vertical solid-state relay and main control unit, wherein, described preposition solid-state relay is arranged between constant voltage constant frequency alternating current power supply and described converter on circuit, described horizontal solid-state relay is arranged between described converter and patient bed horizontal motor on circuit, described vertical solid-state relay is arranged between described converter and patient bed motor vertical on circuit, described main control unit respectively with described preposition solid-state relay, described converter, described horizontal solid-state relay and described vertical solid-state relay electrical connection, for controlling it.
2., as claimed in claim 1 for the patient bed control device of MRI system image noise reduction, also comprise low pass filter, this low pass filter is arranged on the outfan of described converter on circuit, for carrying out low-pass filtering to the output of described converter.
3., for a method for MRI system image noise reduction, comprising:
A) the patient bed control device control described in use claim 1 is patient bed moves to precalculated position;
B) before MRI scanning is carried out to patient, the converter dead electricity in described patient bed control device is made;
C) MRI scanning carried out to patient and obtain MRI image.
4. as claimed in claim 3 for the method for MRI system image noise reduction, wherein,
Described main control unit is electrically connected with MRI scanning element, when described main control unit receives MRI scan instruction, first automatically controls described preposition solid-state relay and disconnects, then control described MRI scanning element and scan.
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| CN101161450A (en) * | 2007-11-22 | 2008-04-16 | 天津市天锻压力机有限公司 | T type double moveable platform structure of hydraulic press as well as its drive and control system |
| CN101278841A (en) * | 2008-05-23 | 2008-10-08 | 北京宝利康医学工程公司 | Control system and method of digital X-ray photo equipment attachment |
| CN101496722A (en) * | 2008-01-29 | 2009-08-05 | 西门子（中国）有限公司 | Sick bed driving device of magnetic resonance system |
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| JP2005102937A (en) * | 2003-09-30 | 2005-04-21 | Konica Minolta Medical & Graphic Inc | X-ray radiographing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101161450A (en) * | 2007-11-22 | 2008-04-16 | 天津市天锻压力机有限公司 | T type double moveable platform structure of hydraulic press as well as its drive and control system |
| CN101496722A (en) * | 2008-01-29 | 2009-08-05 | 西门子（中国）有限公司 | Sick bed driving device of magnetic resonance system |
| CN101278841A (en) * | 2008-05-23 | 2008-10-08 | 北京宝利康医学工程公司 | Control system and method of digital X-ray photo equipment attachment |
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