CN103054583A - 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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- CN103054583A CN103054583A CN2012105812355A CN201210581235A CN103054583A CN 103054583 A CN103054583 A CN 103054583A CN 2012105812355 A CN2012105812355 A CN 2012105812355A CN 201210581235 A CN201210581235 A CN 201210581235A CN 103054583 A CN103054583 A CN 103054583A
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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 and method for MRI system image noise reduction.
Background technology
Nuclear magnetic resonance (Magnetic Resonance Imaging, MRI) also claim NMR (Nuclear Magnetic Resonance)-imaging, be a kind of FA modern medicine imaging technique that produces along with the development of cryogenic technique, superconductor technology, magnet technology, electronic technology and computer technology, in big-and-middle-sized hospital, be widely used.
Human body about 70% is comprised of water, and each hydrone has two protons (being proton).When human body was placed in the high-intensity magnetic field, the spin meeting of a part of proton was along the direction orientation of this high-intensity magnetic field in the human body.At this moment, with suitable radio frequency electromagnetic (electromagnetic wave that namely has resonant frequency) irradiation human body, can make along the spin of the proton of described high-intensity magnetic field direction orientation and reverse, and after having cancelled this radio frequency electromagnetic, the proton that counter-rotating has occured in spin can return to original state, namely return to spin along the state of described high-intensity magnetic field direction orientation, give off simultaneously the photon (being magnetic resonance signal) of certain energy.The intensity of these photons is relevant with proton density, and the moisture content of various tissues is different in the human body, the density that is contained proton is different, therefore, by surveying and analyze the Energy distribution of the photon that these protons give off, just various tissues can be separated, thus the accurate stereo-picture of acquisition inside of human body.Further, if at the suitable gradient magnetic of described uniform high-intensity magnetic field stack, then can greatly improve the spatial resolution of the image that obtains.
The MRI system generally comprises superconducting magnet subsystem, gradient subsystem, Radio Frequency Subsystem, Computer Image Processing subsystem, patient bed and control device etc.Wherein, the superconducting magnet subsystem can provide uniform high-intensity magnetic field; Gradient subsystem can produce the suitable gradient magnetic that is superimposed upon on the described uniform strong magnetic field; Radio Frequency Subsystem can produce short and strong radio-frequency electromagnetic pulse, receive magnetic resonance signal and the output analog electrical signal corresponding with it that human body produces; The Computer Image Processing subsystem becomes digital signal with the analog signal conversion of Radio Frequency Subsystem output, draws the view data of aspect according to the corresponding relation of itself and each voxel of anthroposcopy aspect, and demonstrates the image of observation aspect with different tonal gradations; Patient bed and control device then is used for the patient is moved to described magnetic field to scan.
Patient bed control device by control patient bed horizontal motor and patient bed motor vertical rotate and reverse move patient bedly, make patient's position to be scanned accurately arrive the precalculated position.
Fig. 1 is circuit diagram, simplifies circuit structure for one that shows existing patient bed control device.As shown in Figure 1, existing a kind of patient bed control device 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 also is electrically connected with patient bed motor vertical 302 by vertical solid-state relay 40, main control unit 50 is electrically connected with converter 10, horizontal solid-state relay 30 and vertical solid-state relay 40 respectively, in order to it is controlled.
Horizontal solid-state relay 30 is a kind of noncontacting switches with vertical solid-state relay 40, at the lower state that keeps " leading to " or " breaking " of the control (shown in dotted line 31 and dotted line 41 among Fig. 1) of main control unit 50.When horizontal solid-state relay 30 was in the state of " leading to ", voltage or the adjustable alternating current of frequency of low pass filter 20 output will be applied on the patient bed horizontal motor 301, patient bedly moved with speed and the controlled mode of direction in the horizontal direction thereby make.In like manner, when vertical solid-state relay 40 is in the state of " leading to ", voltage or the adjustable alternating current of frequency of low pass filter 20 output will be applied on the patient bed motor vertical 302, patient bedly move with speed and the controlled mode of direction in vertical direction thereby make.When horizontal solid-state relay 30 or vertical solid-state relay 40 were in the state of " breaking ", correspondingly, patient bed horizontal motor 301 or patient bed motor vertical 302 just stopped operating.
The operation principle of the converter 10 in the existing patient bed control device has determined that it is an interference source to weak electric signal.When converter 10 powers on, exporting even without electric current (is that horizontal solid-state relay 30 and vertical solid-state relay 40 disconnect, patient bed horizontal motor 301 and patient bed motor vertical 302 stop operating), with also finding after the near field probes test, the noise of 0～40MHz is arranged in the port of converter 10, and its intensity is about 70mdB.Because the magnetic resonance signal of MRI system is extremely faint, therefore, the noise of converter 10 is conciliate division to the reception of magnetic resonance signal and is given birth to very large interference, thereby cause bright line or bright spot occurring at the MRI image, these bright lines or bright spot can reduce the signal to noise ratio of image, thereby cause the failure of the reception of magnetic resonance signal or parsing or cause the doctor to the erroneous judgement of image.
The impact that each equipment in the MRI system is produced for the noise that reduces converter 10, usually at input and the outfan of converter 10 magnet ring is installed, with the high-frequency noise of the port that absorbs converter 10, but the intensity of the noise in 0～5MHz frequency range still is about 70mdB.In addition, high-frequency noise in the alternating current that low pass filter 20 can suppress converter 10 output is set, with collection and the parsing of the noise jamming magnetic resonance signal in the forceful electric power of the driving three phase electric machine that prevents converter 10 outputs and the normal operation of disturbing other device.Moreover, can adopt at the seam of the interlock circuit of converter 10 the metal protective case ITT adapter of 360 ° of shieldings.But above-mentioned measure still can not be eradicated the noise of converter 10 fully to the formed interference of MRI image.
Summary of the invention
The present invention makes in order to solve the above-mentioned technical problem that exists in the prior art, its purpose is to provide a kind of patient bed control device and method for MRI system image noise reduction, in order to eradicate bright line or bright spot that noise that the converter in the patient bed control device of MRI system produces causes fully in the MRI image, thereby 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 the described converter at circuit, described horizontal solid-state relay is arranged between described converter and the patient bed horizontal motor at circuit, described vertical solid-state relay is arranged between described converter and the patient bed motor vertical at circuit, described main control unit respectively with described preposition solid-state relay, described converter, described horizontal solid-state relay is electrically connected with described vertical solid-state relay, is used for it is controlled.
Preferably, 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 at circuit, is used for low-pass filtering is carried out in 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 the patient bed precalculated position that moves to of above-mentioned patient bed control device control; B) before the patient being carried out MRI scanning, make the converter dead electricity in the described patient bed control device; C) patient is carried out MRI scanning and obtains the MRI image.
Preferably, in said method, can be, described main control unit be electrically connected with the MRI scanning element, and when described main control unit received the MRI scan instruction, the described preposition solid-state relay of control disconnected automatically first, then controls described MRI scanning element and scans.
By top narration and practice as can be known, 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 the converter no-output, can make the converter dead electricity, thereby the noise of converter is disappeared, to eliminate converter noise to the impact of each the equipment normal operation in the MRI system.Particularly, before the patient being carried out MRI scanning, make the converter dead electricity, can eliminate bright line and bright spot in the MRI image, increase the signal to noise ratio of MRI image, improve the quality of MRI image.
Description of drawings
By the content of reference below in conjunction with the description of the drawings and claims, other purpose of the present invention and result will understand and easy to understand more.In the accompanying drawings:
Fig. 1 is circuit diagram, simplifies circuit structure for one that shows existing patient bed control device;
Fig. 2 is circuit diagram, simplifies circuit structure for one that shows the described patient bed control device for MRI system image noise reduction of one embodiment of the present of invention; And
Fig. 3 is block diagram, shows the described method for MRI system image noise reduction of one embodiment of the present of invention.
Identical label is indicated similar or corresponding feature or function in institute's drawings attached.
The specific embodiment
In the following description, for purposes of illustration, for the complete understanding to one or more embodiment is provided, many details have been set forth.Yet, clearly, can not have to realize these embodiment in the situation of these details yet.In other example, one or more embodiment for convenience of description, known structure and equipment illustrate with the form of block diagram.
Patient bed control device for MRI system image noise reduction of the present invention and the embodiment of method are described below with reference to accompanying drawings.
Fig. 2 is circuit diagram, simplifies circuit structure for one that shows the described patient bed control device for MRI system image noise reduction of one embodiment of the present of invention.As shown in Figure 2, the described patient bed control device for MRI system image noise reduction of 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 the converter 10 at circuit, horizontal solid-state relay 30 is arranged between converter 10 and the patient bed horizontal motor 301 at circuit, vertical solid-state relay 40 is arranged between converter 10 and the patient bed motor vertical 302 at 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, is used for it is controlled.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 at circuit, is used for low-pass filtering is carried out in the output of converter 10.
In other words, converter 10, low pass filter 20, horizontal solid-state relay 30, vertical solid-state relay 40 and the main control board 50 of the related patient bed control device of one embodiment of the present of invention in comprising existing patient bed control device shown in Figure 1, also comprise 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 is subjected to main control unit 50 control, shown in the dotted line 61 among Fig. 2.Preposition solid-state relay 60 is equivalent to a controlled switch, and main control unit 50 is controlled the electric and dead electricity that gets of converter 10 by the on off operating mode of controlling preposition solid-state relay 60.
Inventive concept of the present invention is that when the MRI system started working, by preposition solid-state relay 60 conductings of main control unit 50 controls, thereby it is electric that converter 10 is got.Then or simultaneously, can be by the main control unit 50 horizontal solid-state relays 30 of control or vertical solid-state relay 40 conductings, thereby drive patient bed horizontal motor 301 or patient bed motor vertical 302, so that the patient bed horizontal movement that can expect or move both vertically.
Behind patient bed arrival preposition, before beginning the patient to be carried out MRI scanning, disconnect by the preposition solid-state relay 60 of main control unit 50 controls, thereby make converter 10 dead electricity.Then, again the patient is carried out MRI scanning.Because in the process of the patient being carried out MRI scanning, converter 10 is dead electricity, therefore, just do not have collection and the parsing that any converter noise affects the magnetic resonance signal in the MRI scanning process, thereby fundamentally eradicated bright line or bright spot that noise that converter 10 produces causes in the MRI image.
Fig. 3 is block diagram, shows the described method for MRI system image noise reduction of one embodiment of the present of invention.According to top narration and as shown in Figure 3, the described method for MRI system image noise reduction of one embodiment of the present of invention comprises the steps: at step S410, the patient bed precalculated position that moves to of patient bed control device control of using the invention described above to provide; In step S420, before the patient being carried out MRI scanning, make the converter dead electricity in this patient bed control device; In step S430, the patient is carried out MRI scanning and obtains the MRI image.
In said method, before carrying out MRI scanning, can control separately preposition solid-state relay 60 and disconnect, so that 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 the MRI scan instruction, automatically the preposition solid-state relay 60 of control disconnects first, then controls described MRI scanning element and scans.In this case, the surface sees, with the same to the operation of former MRI system, but this MRI system has automatically disconnected preposition solid-state relay to the operator before MRI scanning to the operation of the MRI system among the present invention, thereby makes converter 10 dead electricity.That is to say, can finish converter outage and two actions of MRI scanning when carrying out scan instruction, therefore just simplified operator's operation.
By top narration and practice as can be known, 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 the converter no-output, can make the converter dead electricity, thereby the noise of converter is disappeared, thereby eliminate the impact of converter noise on each the equipment normal operation in the MRI system.Particularly, before the patient being carried out MRI scanning, make the converter dead electricity, can eliminate bright line and bright spot in the MRI image, increase the signal to noise ratio of MRI image, improve the quality of MRI image.
Although disclose the present invention in conjunction with the preferred embodiment that is shown specifically and describes, but those skilled in the art are to be understood that, for the patient bed control device and the method that are used for MRI system image noise reduction that the invention described above proposes, can also make various improvement on the basis that does not break away 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. patient bed control device that is used 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 the described converter at circuit, described horizontal solid-state relay is arranged between described converter and the patient bed horizontal motor at circuit, described vertical solid-state relay is arranged between described converter and the patient bed motor vertical at circuit, described main control unit respectively with described preposition solid-state relay, described converter, described horizontal solid-state relay is electrically connected with described vertical solid-state relay, is used for it is controlled.
2. the patient bed control device for MRI system image noise reduction as claimed in claim 1 also comprises low pass filter, and this low pass filter is arranged on the outfan of described converter at circuit, is used for low-pass filtering is carried out in the output of described converter.
3. method that is used for MRI system image noise reduction comprises:
A) right to use requires the patient bed precalculated position that moves to of 1 described patient bed control device control;
B) before the patient being carried out MRI scanning, make the converter dead electricity in the described patient bed control device;
C) patient is carried out MRI scanning and obtains the MRI image.
4. the method for MRI system image noise reduction as claimed in claim 3, wherein,
Described main control unit is electrically connected with the MRI scanning element, and when described main control unit received the MRI scan instruction, the described preposition solid-state relay of control disconnected automatically first, then controls described MRI scanning element and scans.
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Cited By (2)
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| CN106443531A (en) * | 2016-12-05 | 2017-02-22 | 苏州朗润医疗系统有限公司 | Compound noise reducing device and method of compound noise reducing |
| CN113017666A (en) * | 2021-02-05 | 2021-06-25 | 明峰医疗系统股份有限公司 | Anti-falling brake circuit of diagnostic bed and CT scanning bed |
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| JP2005102937A (en) * | 2003-09-30 | 2005-04-21 | Konica Minolta Medical & Graphic Inc | X-ray radiographing system |
| 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 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106443531A (en) * | 2016-12-05 | 2017-02-22 | 苏州朗润医疗系统有限公司 | Compound noise reducing device and method of compound noise reducing |
| CN106443531B (en) * | 2016-12-05 | 2024-04-12 | 苏州朗润医疗系统有限公司 | Combined noise reduction device and method for implementing combined noise reduction |
| CN113017666A (en) * | 2021-02-05 | 2021-06-25 | 明峰医疗系统股份有限公司 | Anti-falling brake circuit of diagnostic bed and CT scanning bed |
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| CN103054583B (en) | 2015-03-11 |
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