CN115047390A - Magnetic field safety zone determining device of magnetic resonance imaging assembly based on radar ranging - Google Patents
Magnetic field safety zone determining device of magnetic resonance imaging assembly based on radar ranging Download PDFInfo
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- CN115047390A CN115047390A CN202210720617.5A CN202210720617A CN115047390A CN 115047390 A CN115047390 A CN 115047390A CN 202210720617 A CN202210720617 A CN 202210720617A CN 115047390 A CN115047390 A CN 115047390A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/54—Signal processing systems, e.g. using pulse sequences ; Generation or control of pulse sequences; Operator console
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/24—Electrical actuation by interference with electromagnetic field distribution
- G08B13/2491—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field
- G08B13/2494—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field by interference with electro-magnetic field distribution combined with other electrical sensor means, e.g. microwave detectors combined with other sensor means
Abstract
The invention relates to the technical field of equipment safety, in particular to a magnetic field safety zone determining device of a magnetic resonance imaging assembly based on radar ranging, which comprises a magnetic resonance imaging assembly, a magnetic field safety zone determining device and a magnetic field safety zone determining device, wherein the magnetic resonance imaging assembly is used for nuclear magnetic resonance detection; the radar ranging component is used for detecting the position information of an object; a display assembly for displaying object position information; an alert component for issuing a hazard alert notification; the central control assembly is connected with the magnetic resonance imaging assembly, the radar ranging assembly, the display assembly and the alarm assembly and is used for determining whether an object enters a dangerous area in which the magnetic resonance imaging assembly operates; the magnetic resonance imaging component safety monitoring system is provided with the early warning interval and the dangerous interval for the operation of the magnetic resonance imaging component, and the position of an object around the magnetic resonance imaging component is accurately determined, so that the safety accident caused when the object enters the dangerous interval for the operation of the magnetic resonance imaging component is avoided.
Description
Technical Field
The invention relates to the technical field of equipment safety, in particular to a magnetic field safety zone determining device of a magnetic resonance imaging assembly based on radar ranging.
Background
The nuclear magnetic resonance is a physical process that the matrix of the nuclear magnetic resonance is not zero, the spin energy level is changed under the action of an external magnetic field, and the nuclear magnetic resonance absorbs radio frequency radiation of a certain frequency, so that the nuclear magnetic resonance imaging is a new latest medical image technology utilizing the nuclear magnetic resonance principle; compared with other auxiliary examination means, nuclear magnetic resonance has the advantages of multiple imaging parameters, high scanning speed, high tissue resolution and clearer images, can help doctors to 'see' early-stage lesions which are not easy to detect, and becomes a tool for early-stage screening of tumors, heart diseases and cerebrovascular diseases.
The movable magnetic resonance imaging device has no special requirements on the use environment and can move freely, however, in the use process of the movable magnetic resonance imaging device, a magnet can possibly generate a magnetic leakage phenomenon to generate hidden dangers to surrounding objects and the device, so that when the movable magnetic resonance imaging device is used, the safe operation interval of the device needs to be determined, and therefore, equipment capable of effectively determining the safe operation interval of the magnetic resonance imaging device is needed.
Disclosure of Invention
Therefore, the invention provides a nuclear magnetic safety interval determining device based on radar ranging, which is used for solving the problem that in the prior art, the safety operation interval of a mobile magnetic resonance imaging device cannot be accurately determined, and potential safety hazards are caused to surrounding objects and the device.
In order to achieve the above object, the present invention provides a magnetic field safety zone determining apparatus of a magnetic resonance imaging assembly based on radar ranging, comprising,
the magnetic resonance imaging assembly is used for nuclear magnetic resonance detection;
the radar ranging assembly comprises a plurality of radar probes and is used for detecting the position information of an object;
the display component is connected with the radar ranging component and is used for displaying object position information;
the alarm component is used for sending out a danger alarm notice when the central control component judges that an object enters a danger zone in which the magnetic resonance imaging component operates;
the central control assembly is connected with the magnetic resonance imaging assembly, the radar ranging assembly, the display assembly and the alarm assembly and is used for determining whether an object enters a dangerous area in which the magnetic resonance imaging assembly operates;
when the device is used for determining a magnetic field safety zone of a magnetic resonance imaging assembly, a plurality of radar probes in the radar ranging assembly send out electromagnetic waves in real time to detect the distance between an object existing around the magnetic resonance imaging assembly and the magnetic resonance imaging assembly, an early warning interval for the operation of the magnetic resonance imaging assembly and a dangerous interval for the operation of the magnetic resonance imaging assembly are preset in the central control assembly, before the magnetic resonance imaging assembly works, when the object enters the dangerous interval for the operation of the magnetic resonance imaging assembly, the alarm assembly sends out an alarm notice, the display assembly displays the position of the object, and the object is manually removed; in the working process of the magnetic resonance imaging assembly, when an object enters a dangerous area in which the magnetic resonance imaging assembly operates, the alarm assembly sends out an alarm notice; when an object enters the early warning interval in which the magnetic resonance imaging assembly operates, the central control assembly judges whether the object can affect the operation of the magnetic resonance imaging assembly or not by calculating the danger score of the object.
Further, a pre-warning interval distance L1 for the operation of the magnetic resonance imaging assembly and a dangerous interval distance Lz for the operation of the magnetic resonance imaging assembly are preset in the central control assembly, the pre-warning interval distance L1 for the operation of the magnetic resonance imaging assembly preset in the central control assembly is determined by a range of 5 gauss lines, the distance of the 5 gauss lines is Lz, wherein L1 is 1.2 Lz.
Further, before the magnetic resonance imaging assembly operates, the radar ranging assembly detects whether an object exists around the magnetic resonance imaging assembly, when the radar ranging assembly detects that an object exists around the magnetic resonance imaging assembly, the distance between the object and the magnetic resonance imaging assembly is recorded as L, and distance information is uploaded to the central control assembly, the distance L between the object and the magnetic resonance imaging assembly of the central control assembly is compared with the distance Lm between dangerous zones of operation of the magnetic resonance imaging assembly, and whether the object is in the dangerous zone of operation of the magnetic resonance imaging assembly is determined:
when L is less than Lm, the central control component judges that the detected object is in a dangerous interval of the operation of the magnetic resonance imaging component;
and when the L is larger than or equal to the Lm, the central control assembly judges that the detected object is not in the early warning interval of the operation of the magnetic resonance imaging assembly.
Further, when the central control component determines that the detected object is in a dangerous zone in which the magnetic resonance imaging component operates, the central control component controls the alarm component to send out an alarm notification and controls the magnetic resonance imaging component to be incapable of being started, the display component displays the position of the object, and the object is removed manually.
Further, when an object which influences the operation of the magnetic resonance imaging assembly does not exist in a dangerous interval of the magnetic resonance imaging assembly, the central control assembly controls to start the magnetic resonance imaging assembly, the radar ranging assembly detects the surrounding environment of the magnetic resonance imaging assembly in real time in the working process of the magnetic resonance imaging assembly, when the object enters the range of the early warning distance L1 for the operation of the nuclear magnetic resonance instrument assembly, the distance between the object and the magnetic resonance imaging assembly detected by the radar ranging assembly is recorded as Lm, and the distance Lm between the object and the magnetic resonance imaging assembly is compared with the dangerous interval distance Lz for the operation of the magnetic resonance imaging assembly by the central control assembly:
when Lm is less than or equal to Lz, the central control component controls the alarm component to send out an alarm notice;
and when Lz is less than Lm and less than or equal to L1, the central control component judges whether to control the alarm component to send out an alarm notification or not by calculating the danger score of the object.
Further, when an object enters a range of a running danger interval distance LI of the magnetic resonance imaging assembly in the running process of the magnetic resonance imaging assembly, and the distance Lm between the object and the magnetic resonance imaging assembly is greater than the distance Lz of a 5 gauss line, the central control assembly records the distance Lm between the object and the magnetic resonance imaging assembly; the radar ranging component detects the existence time of the object in the dangerous interval and records the existence time as T; the central control component calculates the influence risk score F of the object on the magnetic resonance imaging component, wherein F is Lm multiplied by alpha + T multiplied by gamma, alpha is a calculation compensation parameter of distance to risk score, and gamma is a calculation compensation parameter of existence time to risk score;
the central control component is preset with a risk score evaluation reference parameter Fp, compares the risk score F with the risk score reference parameter Fp,
when F is less than or equal to Fp, the central control component judges that the object does not influence the operation of the magnetic resonance imaging component;
when F is larger than Fp, the central control component judges that the object can affect the operation of the magnetic resonance imaging component, and controls the alarm component to send out an alarm notice.
Furthermore, a first preset distance La and a second preset distance Lb are arranged in the central control assembly, wherein La is less than Lb; the calculation compensation parameter alpha 1 of the first preset distance to the danger score, the calculation compensation parameter alpha 2 of the second preset distance to the danger score, the calculation compensation parameter alpha 3 of the third preset distance to the danger score, alpha 1 < alpha 2 < alpha 3, when Lz < Lm < L1, the central control component compares the distance Lm between the object and the magnetic resonance imaging component with the first preset distance La and the second preset distance Lb which are set in the central control component:
when Lm is less than La, the central control component selects alpha 1 as a calculation compensation parameter of the distance to the risk score;
when La is less than or equal to Lm and less than or equal to Lb, the central control component selects alpha 2 as a calculation compensation parameter of the distance to the risk score;
when Lm is larger than Lb, the central control component selects alpha 3 as a calculation compensation parameter of the distance to danger score.
Furthermore, a first preset object existence time Ta and a second preset object existence time Tb are set in the central control assembly, wherein Ta is less than Tb; the method comprises the following steps that a calculation compensation parameter gamma 1 of risk scoring in first preset existence time, a calculation compensation parameter gamma 2 of risk scoring in second preset existence time, a calculation compensation parameter gamma 3 of risk scoring in third existence time, wherein gamma 1 is more than gamma 2 and less than gamma 3, when Lz is more than Lm and less than or equal to L1, the central control component compares existence time T of an object in the magnetic resonance imaging component operation early warning interval range with first preset object existence time Ta and second preset object existence time Tb which are set in the central control component:
when T is less than Ta, the central control component selects gamma 1 as a calculation compensation parameter of the object existence time for risk scoring;
when T is more than or equal to Ta and less than or equal to Tb, the central control component selects gamma 2 as a calculation compensation parameter of the existence time of the object for risk scoring;
when T is larger than Tb, the central control component selects gamma 3 as a calculation compensation parameter of the existence time of the object to the risk score.
Preferably, the magnetic resonance imaging assembly is arranged on the base cabinet, and two groups of wheels are arranged below the base cabinet and can drive the base cabinet to move.
Preferably, the two groups of wheels are arranged below the base cabinet, the front group of wheels are universal wheels, the rear group of wheels are fixed direction wheels, and the diameter of the rear group of wheels is larger; each wheel is provided with an independent motor drive for controlling the forward and backward movement of each wheel, so as to control the forward and backward movement and the left and right steering of the base cabinet.
Compared with the prior art, the invention has the advantages that before the magnetic resonance imaging assembly works, the radar ranging assembly is used for detecting the position of an object around the magnetic resonance imaging assembly, the central control assembly is used for controlling the distance between the object and the magnetic resonance imaging assembly, comparing with the distance of the dangerous interval of the magnetic resonance imaging assembly operation preset in the control assembly, judging whether the object is in the dangerous interval of the magnetic resonance imaging assembly operation, when an object is in the operation danger zone of the magnetic resonance imaging assembly, the alarm assembly sends out an alarm notice, by the method, the position of the object is determined more accurately, and hidden dangers of the object and the device caused by opening the magnetic resonance imaging assembly when the object enters the dangerous operating interval of the magnetic resonance imaging assembly are avoided.
Furthermore, when the central control component judges that an object enters the operation dangerous area before the magnetic resonance imaging component works, the alarm component gives an alarm, the display screen component displays the position of the object, and the object is manually discharged.
Further, when no object exists in a dangerous operating interval of the magnetic resonance imaging assembly, the magnetic resonance imaging assembly is started, when the magnetic resonance imaging assembly enters an early warning operating interval of the magnetic resonance imaging assembly in the operating process, the central control assembly determines whether the object is in the range of Lm and L1, when the central control module determines that the object is in the range of Lm and L1, the radar ranging assembly detects the distance between the object and the magnetic resonance imaging assembly and the existing time length, the central control assembly calculates a dangerous score of the object according to the distance between the object and the magnetic resonance imaging assembly and the existing time length of the object, and determines whether the object can affect the safe operation of the magnetic resonance imaging assembly by comparing the calculated dangerous score with a dangerous score preset in the central control assembly, through setting up danger score, prevent that the wrong report takes place for the alarm subassembly, increased the stability in use of the device.
Furthermore, a plurality of calculation compensation parameters for risk scoring are set according to the distance between the object and the nuclear magnetic resonance instrument assembly, and the closer the distance is, the larger the risk scoring is; setting a plurality of compensation parameters for grading the danger according to the existence time of the object in the early warning interval, wherein the longer the existence time is, the larger the danger grade is; the calculation compensation parameters of the risk scores are set through setting a plurality of distances, and the compensation parameters of the risk scores are set through setting a plurality of existence times, so that the alarm is more sensitive, the occurrence of false alarm is prevented, and the use stability of the device is further improved.
Drawings
Fig. 1 is a schematic structural diagram of a magnetic field safety zone determining apparatus of a magnetic resonance imaging assembly based on radar ranging according to an embodiment of the present invention; in the figure: 1-a magnetic resonance imaging assembly; 2-a display assembly; 3-a central control component; 4-an alarm component; 5-a radar ranging assembly; 6-a base cabinet; 7-fixed direction wheels; 8-universal wheel.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1 is a schematic structural diagram of a magnetic field safety zone determining device of a magnetic resonance imaging assembly based on radar ranging according to an embodiment of the present invention; comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the magnetic resonance imaging assembly 1 is used for nuclear magnetic resonance detection;
the radar ranging assembly 5 comprises a plurality of radar probes and is used for detecting the position information of an object;
the display component 2 is connected with the radar ranging component and used for displaying object position information;
the alarm component 4 is used for sending out a danger alarm notice when the central control component judges that an object enters a danger interval in which the magnetic resonance imaging component operates;
the central control component 3 is connected with the magnetic resonance imaging component 1, the radar ranging component 5, the display component 2 and the alarm component 4 and is used for determining whether an object enters a dangerous area in which the magnetic resonance imaging component operates;
when the device is used for determining a magnetic field safety zone of a magnetic resonance imaging assembly, a plurality of radar probes in a radar ranging assembly 5 send out electromagnetic waves in real time to the outside for detecting the distance between an object existing around the magnetic resonance imaging assembly 1 and the magnetic resonance imaging assembly 1, an early warning interval in which the magnetic resonance imaging assembly 1 operates and a dangerous interval in which the magnetic resonance imaging assembly 1 operates are preset in a central control assembly 3, before the magnetic resonance imaging assembly 1 operates, when an object enters the dangerous interval in which the magnetic resonance imaging assembly 1 operates, an alarm assembly 4 sends out an alarm notice, a display assembly 2 displays the position of the object, and the object is manually removed; in the working process of the magnetic resonance imaging assembly 1, when an object enters a dangerous zone in which the magnetic resonance imaging assembly 1 operates, the alarm assembly 4 sends out an alarm notice; when an object enters an early warning interval in which the magnetic resonance imaging assembly 1 operates, the central control assembly 3 judges whether the object can affect the operation of the magnetic resonance imaging assembly 1 or not by calculating the danger score of the object.
Further, an early warning interval distance L1 during which the magnetic resonance imaging assembly 1 operates and a dangerous interval distance Lz during which the magnetic resonance imaging assembly 1 operates are preset in the central control assembly 3, the early warning interval distance L1 during which the magnetic resonance imaging assembly 1 operates, preset in the central control assembly 3, is determined by a range of 5 gauss lines, the distance of 5 gauss lines is Lz, where L1 is 1.2 Lz.
Further, before the magnetic resonance imaging assembly 1 operates, the radar ranging assembly 5 detects whether an object exists around the magnetic resonance imaging assembly 1, when the radar ranging assembly 5 detects that an object exists around the magnetic resonance imaging assembly 1, the distance between the object and the magnetic resonance imaging assembly 1 is recorded as L, and distance information is uploaded to the central control assembly 3, the central control assembly 3 compares the distance L between the object and the magnetic resonance imaging assembly 1 with the distance Lm between dangerous zones of operation of the magnetic resonance imaging assembly 1, and determines whether the object is in the dangerous zone of operation of the magnetic resonance imaging assembly 1:
when L is less than Lm, the central control component 3 judges that the detected object is in a dangerous interval of the operation of the magnetic resonance imaging component;
and when the L is larger than or equal to the Lm, the central control component 3 judges that the detected object is not in the early warning interval of the operation of the magnetic resonance imaging component.
Specifically, before the magnetic resonance imaging assembly works, the radar ranging assembly is used for detecting the position of an object around the magnetic resonance imaging assembly, the central control assembly compares the distance between the object and the magnetic resonance imaging assembly with the distance between dangerous sections in which the magnetic resonance imaging assembly runs, and judges whether the object is in the dangerous sections in which the magnetic resonance imaging assembly runs, and when the object is in the dangerous sections in which the magnetic resonance imaging assembly runs, the alarm assembly sends out alarm notification.
Further, when the central control module 3 determines that the detected object is in the dangerous zone in which the magnetic resonance imaging module 1 operates, the central control module 3 controls the alarm module 4 to give an alarm notification and controls the magnetic resonance imaging module 1 to be unable to start, and the display module 2 displays the position of the object, so as to manually remove the object.
Specifically speaking, when well accuse subassembly judges before magnetic resonance imaging subassembly work, when having the object to get into its dangerous interval of operation, the alarm subassembly sends out the police dispatch newspaper, the display screen subassembly shows the object position, carries out the discharge of object by the manual work, through this kind of mode, guaranteed before the magnetic resonance imaging subassembly work, the safety of surrounding environment.
Further, when there is no object affecting the operation of the magnetic resonance imaging assembly in the dangerous zone of the magnetic resonance imaging assembly 1, the central control assembly 3 controls to start the magnetic resonance imaging assembly 1, in the working process of the magnetic resonance imaging assembly 1, the radar ranging assembly 5 detects the surrounding environment of the magnetic resonance imaging assembly 1 in real time, when an object enters the range of the early warning distance L1 for the operation of the nuclear magnetic resonance instrument assembly 1, the distance between the object and the magnetic resonance imaging assembly 1 detected by the radar ranging assembly 5 is denoted as Lm, and the central control assembly 3 compares the distance Lm between the object and the magnetic resonance imaging assembly 1 with the dangerous zone distance Lz for the operation of the magnetic resonance imaging assembly 1:
when Lm is less than or equal to Lz, the central control component 3 controls the alarm component 4 to send out an alarm notice;
when Lz < Lm ≦ L1, the central control component 3 judges whether to control the alarm component to give an alarm notification or not by calculating the danger score of the object.
Further, when an object enters a range of a distance LI between the dangerous operating interval 1 and the magnetic resonance imaging assembly 1 during the operation of the magnetic resonance imaging assembly 1, and a distance Lm between the object and the magnetic resonance imaging assembly 1 is greater than a distance Lz of a 5 gauss line, the central control assembly 3 records the distance Lm between the object and the magnetic resonance imaging assembly 1; the radar ranging component 5 detects the existence time of the object in the dangerous interval, and the existence time is marked as T; the central control component 3 calculates the risk score F of the object on the magnetic resonance imaging component 1, where F is Lm × α + T × γ, where α is a calculation compensation parameter of distance on the risk score, and γ is a calculation compensation parameter of existence time on the risk score;
the central control component 3 is preset with a risk score evaluation reference parameter Fp, the central control component 3 compares the risk score F with the risk score reference parameter Fp,
when F is less than or equal to Fp, the central control component 3 judges that the object does not influence the operation of the magnetic resonance imaging component;
when F is larger than Fp, the central control component 3 judges that the object can affect the operation of the magnetic resonance imaging component and controls the alarm component to send out an alarm notice.
Specifically, when no object exists in a danger zone of the operation of the magnetic resonance imaging assembly, the magnetic resonance imaging assembly is started, when an object enters an early warning zone of the operation of the magnetic resonance imaging assembly in the operation process of the magnetic resonance imaging assembly, the central control assembly determines whether the object is in the range of Lm and L1, when the central control module determines that the object is in the range of Lm and L1, the radar ranging assembly detects the distance between the object and the magnetic resonance imaging assembly and the existence duration, the central control assembly calculates the danger score of the object through the distance between the object and the magnetic resonance imaging assembly and the existence duration of the object, and judges whether the object can affect the safe operation of the magnetic resonance imaging assembly by comparing the calculated danger score with the danger score preset in the central control assembly, through setting up danger score, prevent that the wrong report takes place for the alarm subassembly, increased the stability in use of the device.
Further, a first preset distance La and a second preset distance Lb are arranged in the central control assembly 3, wherein La is less than Lb; the calculation compensation parameter alpha 1 of the first preset distance to the danger score, the calculation compensation parameter alpha 2 of the second preset distance to the danger score, the calculation compensation parameter alpha 3 of the third preset distance to the danger score, alpha 1 < alpha 2 < alpha 3, when Lz < Lm < L1, the central control component compares the distance Lm between the object and the magnetic resonance imaging component with the first preset distance La and the second preset distance Lb which are set in the central control component:
when Lm is less than La, the central control component 3 selects alpha 1 as a calculation compensation parameter of the distance to the risk score;
when La is less than or equal to Lm and less than or equal to Lb, the central control component 3 selects alpha 2 as a calculation compensation parameter of the distance to the risk score;
when Lm is larger than Lb, the central control component 3 selects alpha 3 as a calculation compensation parameter of the distance to danger score.
Further, a first preset object existence time Ta and a second preset object existence time Tb are set in the central control component 3, wherein Ta is less than Tb; the calculation compensation parameter gamma 1 of the risk score is carried out in the first preset existence time, the calculation compensation parameter gamma 2 of the risk score is carried out in the second preset existence time, the calculation compensation parameter gamma 3 of the risk score is carried out in the third existence time, gamma 1 is more than gamma 2 and is more than gamma 3, when Lz is more than Lm and is less than or equal to L1, the existence time T of an object in the magnetic resonance imaging assembly 1 operation early warning interval range is compared with the first preset object existence time Ta and the second preset object existence time Tb which are set in the central control assembly by the central control assembly 3:
when T is less than Ta, the central control component 3 selects gamma 1 as a calculation compensation parameter of the object existence time for risk score;
when T is more than or equal to Ta and less than or equal to Tb, the central control component 3 selects gamma 2 as a calculation compensation parameter of the existence time of the object for risk scoring;
when T is larger than Tb, the central control component 3 selects gamma 3 as a calculation compensation parameter of the existence time of the object to the risk score.
Specifically, a plurality of calculation compensation parameters for risk scoring are set according to the distance between the object and the nuclear magnetic resonance instrument assembly, and the closer the distance is, the larger the risk scoring is; setting a plurality of compensation parameters for grading the danger according to the existence time of the object in the early warning interval, wherein the longer the existence time is, the larger the danger grade is; the calculation compensation parameters of the risk scores are set through setting a plurality of distances, and the compensation parameters of the risk scores are set through setting a plurality of existence times, so that the alarm is more sensitive, the occurrence of false alarm is prevented, and the use stability of the device is further improved.
Preferably, the magnetic resonance imaging assembly 1 is arranged on the base cabinet 6, and two sets of wheels are arranged below the base cabinet 6, so that the base cabinet can be driven to move.
Preferably, two groups of wheels are arranged below the base cabinet 6, the front group of wheels are universal wheels 8, the rear group of wheels are fixed direction wheels 7, and the diameter of the rear group of wheels is larger; each wheel is provided with an independent motor drive for controlling the forward and backward movement of each wheel, thereby controlling the forward and backward movement and the left and right steering of the base cabinet 6.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A magnetic field safety zone determination device of a magnetic resonance imaging assembly based on radar ranging is characterized by comprising,
the magnetic resonance imaging assembly is used for detecting nuclear magnetic resonance;
the radar ranging assembly comprises a plurality of radar probes and is used for detecting the position information of an object;
the display component is connected with the radar ranging component and is used for displaying object position information;
the alarm component is used for sending out a danger alarm notice when the central control component judges that an object enters a danger zone in which the magnetic resonance imaging component operates;
the central control assembly is connected with the magnetic resonance imaging assembly, the radar ranging assembly, the display assembly and the alarm assembly and is used for determining whether an object enters a dangerous area in which the magnetic resonance imaging assembly operates;
when the device is used for determining a magnetic field safety zone of a magnetic resonance imaging assembly, a plurality of radar probes in the radar ranging assembly send out electromagnetic waves in real time to detect the distance between an object existing around the magnetic resonance imaging assembly and the magnetic resonance imaging assembly, an early warning interval for the operation of the magnetic resonance imaging assembly and a dangerous interval for the operation of the magnetic resonance imaging assembly are preset in the central control assembly, before the magnetic resonance imaging assembly works, when the object enters the dangerous interval for the operation of the magnetic resonance imaging assembly, the alarm assembly sends out an alarm notice, the display assembly displays the position of the object, and the object is manually removed; in the working process of the magnetic resonance imaging assembly, when an object enters a dangerous area in which the magnetic resonance imaging assembly operates, the alarm assembly sends out an alarm notice; when an object enters the early warning interval in which the magnetic resonance imaging assembly operates, the central control assembly judges whether the object can affect the operation of the magnetic resonance imaging assembly or not by calculating the danger score of the object.
2. The apparatus for determining the magnetic field safe zone of the magnetic resonance imaging assembly based on radar ranging as claimed in claim 1, wherein the central control assembly is preset with an early warning zone distance L1 for the operation of the magnetic resonance imaging assembly and a dangerous zone distance Lz for the operation of the magnetic resonance imaging assembly, the early warning zone distance L1 for the operation of the magnetic resonance imaging assembly preset in the central control assembly is determined by a range of 5 gauss lines, and the distance of the 5 gauss lines is Lz, wherein L1 is 1.2 Lz.
3. The apparatus for determining the magnetic field safe area of the magnetic resonance imaging assembly based on radar ranging as claimed in claim 2, wherein the radar ranging assembly detects whether an object exists around the magnetic resonance imaging assembly before the magnetic resonance imaging assembly operates, when the radar ranging assembly detects that an object exists around the magnetic resonance imaging assembly, the distance between the object and the magnetic resonance imaging assembly is recorded as L, and the distance information is uploaded to the central control assembly, the distance L between the object and the magnetic resonance imaging assembly of the central control assembly is compared with the distance Lm between the magnetic resonance imaging assembly and the operating danger zone, and whether the object is in the danger zone of the magnetic resonance imaging assembly operation is determined:
when L is less than Lm, the central control component judges that the detected object is in a dangerous interval of the operation of the magnetic resonance imaging component;
and when the L is larger than or equal to the Lm, the central control assembly judges that the detected object is not in the early warning interval of the operation of the magnetic resonance imaging assembly.
4. The apparatus of claim 3, wherein when the central control module determines that the detected object is in a dangerous zone of the MRI module, the central control module controls the alarm module to send out an alarm notification and controls the MRI module to be disabled, and the display module displays the position of the object for manual object elimination.
5. The apparatus for determining the magnetic field safety zone of the magnetic resonance imaging assembly based on radar ranging according to claim 4, wherein when there is no object affecting the operation of the magnetic resonance imaging assembly in the danger zone of the magnetic resonance imaging assembly, the central control assembly controls to start the magnetic resonance imaging assembly, during the operation of the magnetic resonance imaging assembly, the radar ranging assembly detects the surrounding environment of the magnetic resonance imaging assembly in real time, when an object enters the range of the early warning distance L1 of the operation of the nuclear magnetic resonance instrument assembly, the radar ranging assembly detects the distance between the object and the magnetic resonance imaging assembly as Lm, and the central control assembly compares the distance Lm between the object and the magnetic resonance imaging assembly with the danger zone distance Lz of the operation of the magnetic resonance imaging assembly:
when Lm is less than or equal to Lz, the central control component controls the alarm component to send out an alarm notice;
and when Lz is less than Lm and less than or equal to L1, the central control component judges whether to control the alarm component to send out an alarm notification or not by calculating the danger score of the object.
6. The apparatus for determining the magnetic field safety zone of the magnetic resonance imaging assembly based on radar ranging as claimed in claim 5, wherein when an object enters a range of a dangerous zone distance LI of operation of the magnetic resonance imaging assembly during operation of the magnetic resonance imaging assembly, and a distance Lm between the object and the magnetic resonance imaging assembly is greater than a distance Lz of 5 gauss, the central control assembly records the distance Lm between the object and the magnetic resonance imaging assembly; the radar ranging component detects the existence time of the object in the dangerous interval and records the existence time as T; the central control component calculates the influence risk score F of the object on the magnetic resonance imaging component, wherein F is Lm multiplied by alpha + T multiplied by gamma, alpha is a calculation compensation parameter of distance to risk score, and gamma is a calculation compensation parameter of existence time to risk score;
the central control component is preset with a risk score evaluation reference parameter Fp, the central control component compares the risk score F with the risk score reference parameter Fp,
when F is less than or equal to Fp, the central control component judges that the object does not influence the operation of the magnetic resonance imaging component;
when F is larger than Fp, the central control component judges that the object can affect the operation of the magnetic resonance imaging component, and controls the alarm component to send out an alarm notice.
7. The apparatus of claim 6, wherein the central control assembly has a first predetermined distance La and a second predetermined distance Lb, where La < Lb; the calculation compensation parameter alpha 1 of the first preset distance to the danger score, the calculation compensation parameter alpha 2 of the second preset distance to the danger score, the calculation compensation parameter alpha 3 of the third preset distance to the danger score, alpha 1 < alpha 2 < alpha 3, when Lz < Lm < L1, the central control component compares the distance Lm between the object and the magnetic resonance imaging component with the first preset distance La and the second preset distance Lb which are set in the central control component:
when Lm is less than La, the central control component selects alpha 1 as a calculation compensation parameter of the distance to the risk score;
when La is less than or equal to Lm and less than or equal to Lb, the central control component selects alpha 2 as a calculation compensation parameter of the distance to the risk score;
when Lm is larger than Lb, the central control component selects alpha 3 as a calculation compensation parameter of the distance to danger score.
8. The apparatus for determining the magnetic field safety zone of a magnetic resonance imaging assembly based on radar ranging according to claim 7, wherein the central control assembly is provided therein with a first preset object existence time Ta and a second preset object existence time Tb, where Ta < Tb; the method comprises the following steps that a calculation compensation parameter gamma 1 of risk scoring in first preset existence time, a calculation compensation parameter gamma 2 of risk scoring in second preset existence time, a calculation compensation parameter gamma 3 of risk scoring in third existence time, wherein gamma 1 is more than gamma 2 and less than gamma 3, when Lz is more than Lm and less than or equal to L1, the central control component compares existence time T of an object in the magnetic resonance imaging component operation early warning interval range with first preset object existence time Ta and second preset object existence time Tb which are set in the central control component:
when T is less than Ta, the central control component selects gamma 1 as a calculation compensation parameter of the object existence time for risk scoring;
when T is more than or equal to Ta and less than or equal to Tb, the central control component selects gamma 2 as a calculation compensation parameter of the existence time of the object for risk scoring;
when T is larger than Tb, the central control component selects gamma 3 as a calculation compensation parameter of the existence time of the object to the risk score.
9. The apparatus for determining the magnetic field safety zone of a magnetic resonance imaging assembly based on radar ranging as claimed in claim 8, wherein the magnetic resonance imaging assembly is disposed on a base cabinet, and two sets of wheels are disposed under the base cabinet to move the base cabinet.
10. The apparatus for determining the magnetic field safety zone of a magnetic resonance imaging assembly based on radar ranging as claimed in claim 9, wherein the two sets of wheels are arranged under the base cabinet, the front set of wheels are universal wheels, the rear set of wheels are fixed direction wheels, and the diameter of the rear set of wheels is larger; each wheel is provided with an independent motor drive for controlling the forward and backward movement of each wheel, so as to control the forward and backward movement and the left and right steering of the base cabinet.
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