CN109085521B - High-pressure discharge compensation method and device for three-dimensional nuclear magnetic resonance imager - Google Patents
High-pressure discharge compensation method and device for three-dimensional nuclear magnetic resonance imager Download PDFInfo
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- CN109085521B CN109085521B CN201810567578.3A CN201810567578A CN109085521B CN 109085521 B CN109085521 B CN 109085521B CN 201810567578 A CN201810567578 A CN 201810567578A CN 109085521 B CN109085521 B CN 109085521B
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- 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]
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The high-pressure discharge compensation method and the device for the three-dimensional nuclear magnetic resonance imager are provided with at least two antenna emission modules; each antenna emission module is respectively connected with the three-dimensional nuclear magnetic resonance imager main body and sequentially emits nuclear magnetic resonance signals under the control of the three-dimensional nuclear magnetic resonance imager main body; the antenna transmitting module comprises an antenna unit, a tuning capacitor set, a bleeder unit and an antenna switch; the antenna unit is connected with the three-dimensional nuclear magnetic resonance imager main body through the antenna switch and used for transmitting the nuclear magnetic resonance signal; the tuning capacitor bank is connected with the antenna unit in parallel and used for tuning the frequency of the nuclear magnetic resonance signal; the discharge unit is connected with the antenna unit in parallel and used for discharging residual energy of the antenna emission module after the emission is finished, so that the echo interval time of the nuclear magnetic signals is effectively reduced.
Description
Technical Field
The invention relates to the electronic circuit technology, in particular to a high-pressure discharge compensation method and device for a three-dimensional nuclear magnetic resonance imager.
Background
Nuclear Magnetic Resonance (NMR) phenomenon was discovered in 1946, and soon thereafter, it was applied to the fields of physics, chemistry, material science, life science, medicine, and the like. In the 50 s of the 20 th century, nuclear magnetic resonance began to be applied in the oil and gas industry, initially in the field of reservoir petrophysical. The nuclear magnetic resonance imager can detect formation information around a borehole by using the nuclear magnetic resonance principle, and has unique qualitative identification and quantitative evaluation capabilities of reservoir fluid.
The antenna assembly is one of important parts of the nuclear magnetic resonance imager, and the structure of the antenna assembly determines key performances of the instrument such as a measurement mode, a nuclear magnetic resonance area, nuclear magnetic resonance signal intensity and the like. In the prior art, when multiple antenna assemblies are included in the mri apparatus, the antenna assemblies will transmit the nmr signals sequentially at predetermined time intervals in order to meet the measurement requirements.
However, due to the physical characteristics of the antenna assembly, after the antenna assembly completes transmission of the nuclear magnetic resonance signal, a certain amount of residual energy remains inside the antenna assembly, and the antenna assembly needs to wait for the residual energy to be released before starting next signal transmission. This also results in longer echo interval time of the nuclear magnetic signal in the conventional nuclear magnetic resonance imager, which is not favorable for improving the measurement accuracy.
Disclosure of Invention
The invention provides a high-pressure discharge compensation method and a high-pressure discharge compensation device for a three-dimensional nuclear magnetic resonance imager, aiming at the problems that in the prior art, after the nuclear magnetic resonance signal is transmitted, a certain amount of residual energy still remains in the antenna, so that the antenna can start the next signal transmission after the residual energy is released, the echo interval time of the nuclear magnetic signal in the conventional nuclear magnetic resonance imager is longer, and the improvement of the measurement accuracy and the measurement efficiency is not facilitated.
In one aspect, the present invention provides a high pressure relief compensation device for a three-dimensional nuclear magnetic resonance imager, comprising: at least two antenna transmission modules;
each antenna emission module is respectively connected with the three-dimensional nuclear magnetic resonance imager main body and sequentially emits nuclear magnetic resonance signals under the control of the three-dimensional nuclear magnetic resonance imager main body;
the antenna transmitting module comprises an antenna unit, a tuning capacitor set, a bleeder unit and an antenna switch; the antenna unit is connected with the three-dimensional nuclear magnetic resonance imager main body through the antenna switch and used for transmitting the nuclear magnetic resonance signal; the tuning capacitor bank is connected with the antenna unit in parallel and used for tuning the frequency of the nuclear magnetic resonance signal; the discharge unit is connected in parallel with the antenna unit and used for discharging residual energy of the antenna emission module after emission is completed.
In an alternative embodiment, the at least two antenna radiation modules are arranged on the same horizontal plane, and the antenna radiation modules are uniformly distributed along the circumference.
In an alternative embodiment, the tuning capacitor bank comprises a main tuning capacitor and at least one sub-tuning capacitor bank;
the main tuning capacitor is connected in parallel with the at least one sub-tuning capacitor bank, wherein the sub-tuning capacitor bank comprises a sub-tuning capacitor and a tuning switch connected in series with the sub-tuning capacitor; the tuning switch is used for controlling the working state of the sub-tuning capacitor connected with the tuning switch.
In an alternative embodiment, the capacitance value of the main tuning capacitor is greater than the capacitance value of each of the sub-tuning capacitors.
In an optional implementation manner, when the number of the sub-tuning capacitor sets is two or more, capacitance values of the sub-tuning capacitors are different.
In an alternative embodiment, the number of the antenna switches in each antenna transmission module is two; and two ends of the antenna unit are respectively connected with the three-dimensional nuclear magnetic resonance imager main body through an antenna switch.
In an optional embodiment, the three-dimensional mri high-pressure relief compensation device further includes: an electronic short section;
the electronic short section is respectively connected with two ends of each antenna emission module and is also connected with the three-dimensional nuclear magnetic resonance imager main body.
In one optional embodiment, the bleed unit comprises: the device comprises a bleeder switch and at least two bleeder resistors;
the bleeder switch and each bleeder resistor are connected in series, and any two of the at least two bleeder resistors are grounded.
On the other hand, the invention provides a three-dimensional nuclear magnetic resonance imager high-pressure discharge compensation method based on any one of the three-dimensional nuclear magnetic resonance imager high-pressure discharge compensation devices, which comprises the following steps:
controlling each antenna transmitting module to sequentially transmit nuclear magnetic resonance signals with preset frequency;
when one of the antenna emission modules emits a nuclear magnetic resonance signal, the frequency of the nuclear magnetic resonance signal corresponding to the other antenna emission modules is not the preset frequency;
after one of the antenna transmission modules transmits the nuclear magnetic resonance signal and before the next antenna transmission module transmits the nuclear magnetic resonance signal, the bleeder unit in the one of the antenna transmission modules is conducted, so that the residual energy in the one of the antenna transmission modules is discharged.
In an optional implementation manner, after the bleeding unit in one of the antenna transmission modules is turned on, and before the next antenna transmission module transmits the nuclear magnetic resonance signal, the method further includes:
controlling the antenna switches of the other antenna transmitting modules to be conducted so that the other antenna transmitting modules assist the discharging unit in one of the antenna transmitting modules to discharge the residual energy; and the frequencies of the nuclear magnetic resonance signals corresponding to the other antenna transmitting modules are the preset frequencies.
The high-pressure discharge compensation method and the device for the three-dimensional nuclear magnetic resonance imager are provided with at least two antenna emission modules; each antenna emission module is respectively connected with the three-dimensional nuclear magnetic resonance imager main body and sequentially emits nuclear magnetic resonance signals under the control of the three-dimensional nuclear magnetic resonance imager main body; the antenna transmitting module comprises an antenna unit, a tuning capacitor set, a bleeder unit and an antenna switch; the antenna unit is connected with the three-dimensional nuclear magnetic resonance imager main body through the antenna switch and used for transmitting the nuclear magnetic resonance signal; the tuning capacitor bank is connected with the antenna unit in parallel and used for tuning the frequency of the nuclear magnetic resonance signal; the discharge unit is connected in parallel with the antenna unit and used for discharging residual energy of the antenna emission module after emission is completed. And each antenna emission module is provided with a discharge unit connected with the antenna unit in parallel, so that the discharge unit can rapidly discharge the residual energy of the antenna emission module after the emission is finished, and the echo interval time of the nuclear magnetic signals is effectively reduced.
Drawings
Fig. 1 is a schematic circuit structure diagram of a high-voltage leakage compensation device of a three-dimensional nuclear magnetic resonance imager according to an embodiment of the present invention;
fig. 2 is a schematic circuit structure diagram of another high-voltage leakage compensation device of a three-dimensional magnetic resonance imager according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a high-pressure bleed-off compensation method for a three-dimensional nuclear magnetic resonance imager according to a second embodiment of the present invention.
Reference numerals:
10-an antenna transmission module; 11-an antenna element;
12-tuning capacitor bank; 121-main tuning capacitance;
122-sub tuning capacitance; 123-tuning switch;
13-a bleed unit; 131-a bleeder switch;
132-a bleed-off resistance; 14-an antenna switch;
20-three-dimensional nuclear magnetic resonance imager body.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the embodiments of the present application, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It is noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
Before explaining the technical scheme provided by the invention, the prior art related to the invention is explained firstly:
nuclear Magnetic Resonance (NMR) phenomenon was discovered in 1946, and soon thereafter, it was applied to the fields of physics, chemistry, material science, life science, medicine, and the like. In the 50 s of the 20 th century, nuclear magnetic resonance began to be applied in the oil and gas industry, initially in the field of reservoir petrophysical. The nuclear magnetic resonance imager can detect formation information around a borehole by using the nuclear magnetic resonance principle, and has unique qualitative identification and quantitative evaluation capabilities of reservoir fluid.
The antenna assembly is one of important parts of the nuclear magnetic resonance imager, and the structure of the antenna assembly determines key performances of the instrument such as a measurement mode, a nuclear magnetic resonance area, nuclear magnetic resonance signal intensity and the like. In the prior art, when multiple antenna assemblies are included in the mri apparatus, the antenna assemblies will transmit the nmr signals sequentially at predetermined time intervals in order to meet the measurement requirements.
However, due to the physical characteristics of the antenna assembly, after the antenna assembly completes transmission of the nuclear magnetic resonance signal, a certain amount of residual energy remains inside the antenna assembly, and the antenna assembly needs to wait for the residual energy to be released before starting next signal transmission. This also results in longer echo interval time of the nuclear magnetic signal in the conventional nuclear magnetic resonance imager, which is not favorable for improving the measurement accuracy.
Fig. 1 is a schematic circuit structure diagram of a high-voltage leakage compensation device of a three-dimensional nuclear magnetic resonance imager according to an embodiment of the present invention.
As shown in fig. 1, the high pressure relief compensation device for a three-dimensional mri apparatus may include:
at least two antenna transmission modules 10;
each antenna emission module 10 is respectively connected with the three-dimensional nuclear magnetic resonance imager main body 20, and sequentially emits nuclear magnetic resonance signals under the control of the three-dimensional nuclear magnetic resonance imager main body 20;
the antenna transmitting module 10 includes an antenna unit 11, a tuning capacitor bank 12, a bleeding unit 13, and an antenna switch 14; the antenna unit 11 is connected to the three-dimensional nuclear magnetic resonance imager main body 20 through the antenna switch 14, and is configured to transmit the nuclear magnetic resonance signal; the tuning capacitor bank 12 is connected in parallel with the antenna unit 11, and is configured to tune a frequency of the nuclear magnetic resonance signal; the bleeding unit 13 is connected in parallel with the antenna unit 11, and is configured to bleed off remaining energy of the antenna transmission module 10 after transmission is completed.
In the first embodiment, the antenna emitting module 10 may specifically include an electronic chip, a microcircuit, an integrated circuit, and the like, which have a function of receiving and transmitting a nuclear magnetic resonance signal, wherein the number of the antenna emitting modules 10 is two or more, and the antenna switches 14 in the antenna emitting unit may be various types of switches, such as a diode switch, a semiconductor field effect transistor switch, and the like; the tuning capacitor bank 12 in the antenna transmitting unit may specifically be composed of a plurality of capacitors connected in parallel, or may be composed of a capacitor with a variable capacitance value; the bleeding unit 13 in the antenna transmitting unit may specifically be composed of various components, such as a capacitor, a switch, a resistor, and the like, and the bleeding unit 13 may be used to realize bleeding of remaining energy in the antenna transmitting module 10 after transmission is completed; the three-dimensional mri main body 20 may specifically refer to a portion of the three-dimensional mri apparatus excluding the above-described structure, which includes, but is not limited to, a controller, a processor, an imaging device, and the like.
Specifically, two ends of the antenna unit 11 in each antenna emitting module 10 are respectively connected to the three-dimensional mri main body, and an antenna switch 14 is further connected between each antenna unit 11 and the three-dimensional mri main body 20, so that the three-dimensional mri main body 20 controls the operating state of each antenna emitting module 10 through the antenna switch 14. Meanwhile, the tuning capacitor bank 12 is connected in parallel to two ends of the antenna unit 11, and is configured to tune a transmission frequency of the nuclear magnetic resonance signal transmitted by the antenna unit 11. Generally, the antenna emitting modules 10 emit the nmr signals sequentially in a predetermined sequence and time interval. After any antenna transmitting module 10 finishes transmitting the nuclear magnetic resonance signal, and before the next antenna transmitting module 10 starts transmitting the nuclear magnetic resonance signal, the discharging unit 13 starts working and discharges the residual energy in the antenna transmitting module 10 which finishes transmitting currently.
In this embodiment, in order to solve the problem that, in the prior art, after the antenna transmission module 10 completes transmission of the nuclear magnetic resonance signal, the antenna transmission module 10 needs to wait for release of remaining energy therein before starting next signal transmission, so that the echo interval time of the nuclear magnetic signal is long, and the measurement accuracy is not improved, the antenna transmission module 10 of this embodiment adopts a mode in which the tuning capacitor bank 12, the antenna unit 11, and the bleeding unit 13 are connected in parallel, so that the remaining energy of the antenna transmission module 10 is bled by the bleeding unit 13.
Preferably, in one alternative embodiment, the day-to-day emission modules are arranged on the same horizontal plane so that measurements can be made at the same floor depth. In addition, each antenna emitting module 10 may be arranged in a manner of being uniformly distributed along the circumference, for example, if the number of the antenna emitting modules 10 is 3, the included angle between every two antenna emitting modules 10 may be 120 degrees; if the number of the antenna emitting modules 10 is 6, an included angle between every two antenna emitting modules 10 may be 60 degrees; if the number of the antenna emitting modules 10 is N, the included angle between every two antenna emitting modules 10 may be 360/N degrees.
Preferably, in an alternative embodiment, the number of the antenna switches 14 in each antenna transmission module 10 is two, and two ends of the antenna unit 11 are connected to the three-dimensional magnetic resonance imager main body 20 through one antenna switch 14 respectively.
In other words, in the present embodiment, two antenna switches 14 are connected to each antenna unit 11, and the switching states of the two antenna switches 14 need to be kept consistent, so that the antenna unit 11 can be switched between the transmission state and the non-transmission state.
Preferably, in an optional embodiment, the three-dimensional mri high-pressure relief compensation device further includes: an electronic short section; the electronic short section is respectively connected with two ends of the antenna unit 11 of each antenna emission module 10, and is also connected with the three-dimensional nuclear magnetic resonance imager main body 20.
In other words, in this embodiment, an electronic short structure is further provided to effectively connect and fix the antenna emission module 10 and the three-dimensional nuclear magnetic resonance imager main body 20, so that the transmission connectivity of the antenna emission module 10 and the three-dimensional nuclear magnetic resonance imager main body 20 on the data signal layer is ensured, and the stability of the connection structure of the antenna emission module 10 and the three-dimensional nuclear magnetic resonance imager main body 20 is also ensured.
Preferably, in an alternative embodiment, the antenna switch 14 is a relay switch, and the relay switch can provide security and controllability for the whole antenna circuit.
On the basis of fig. 1, in order to further explain the high-pressure bleed compensation device of the three-dimensional nuclear magnetic resonance imager provided by the present invention, fig. 2 is a schematic circuit structure diagram of another high-pressure bleed compensation device of the three-dimensional nuclear magnetic resonance imager provided by the first embodiment of the present invention.
As shown in fig. 2, similar to the embodiment of fig. 1, the high pressure relief compensation device of the three-dimensional mri apparatus includes:
at least two antenna transmission modules 10;
each antenna emission module 10 is respectively connected with the three-dimensional nuclear magnetic resonance imager main body 20, and sequentially emits nuclear magnetic resonance signals under the control of the three-dimensional nuclear magnetic resonance imager main body 20;
the antenna transmitting module 10 includes an antenna unit 11, a tuning capacitor bank 12, a bleeding unit 13, and an antenna switch 14; the antenna unit 11 is connected to the three-dimensional nuclear magnetic resonance imager main body 20 through the antenna switch 14, and is configured to transmit the nuclear magnetic resonance signal; the tuning capacitor bank 12 is connected in parallel with the antenna unit 11, and is configured to tune a frequency of the nuclear magnetic resonance signal; the bleeding unit 13 is connected in parallel with the antenna unit 11, and is configured to bleed off remaining energy of the antenna transmission module 10 after transmission is completed.
Unlike the embodiment of fig. 1, in the present embodiment, the tuning capacitor bank 12 includes a main tuning capacitor 121 and at least one sub-tuning capacitor 122 bank 12; the main tuning capacitor 121 is connected in parallel with the at least one sub-tuning capacitor 122 group 12, wherein the sub-tuning capacitor 122 group 12 includes a sub-tuning capacitor 122 and a tuning switch 123 connected in series with the sub-tuning capacitor 122; the tuning switch 123 is used to control the operation state of the sub-tuning capacitor 122 connected thereto.
The bleeder unit 13 comprises a bleeder switch 131 and at least two bleeder resistors 132; the bleeder switch 131 and each of the bleeder resistors 132 are connected in series, and any two of the at least two bleeder resistors 132 are grounded. The number of the bleeder switches 131 may be two, and the two bleeder switches 131 are respectively disposed on two sides of the grounding point between any two of the bleeder resistors 132.
It should be noted that, in this embodiment, because the structure of the plurality of antenna emission modules 10 is adopted, in order to avoid the nuclear magnetic resonance coupling phenomenon between the antenna emission modules 10, when one of the antenna emission modules 10 is in the emission state, the operating state of the sub-tuning capacitor 122 of the other antenna emission module 10 needs to be adjusted, so as to reduce the influence of the other antenna emission module 10 on the antenna emission module 10 currently emitting the nuclear magnetic resonance signal, and ensure the stability and consistency of the emission frequency of the currently emitted nuclear magnetic resonance signal. In the present embodiment, the switching state of the tuning switch 123 can be controlled, so that the tuning capacitance value corresponding to the antenna unit 11 can be changed, and the transmission frequency of the nuclear magnetic resonance signal transmitted from the antenna unit 11 can be changed.
Of course, it is preferable that the capacitance value of the main tuning capacitor 121 is greater than the capacitance value of each sub tuning capacitor 122, so as to ensure stability of the transmission frequency of the whole nuclear magnetic resonance signal. In addition, when the number of the sub-tuning capacitor 122 groups 12 is two or more, the capacitance value of each sub-tuning capacitor 122 is preferably different, so that the transmission frequency can be selected more variously.
The bleeder unit 13 is formed by at least two bleeder resistors 132 and a bleeder switch 131 connected in series, wherein the resistance value of each bleeder resistor 132 can be selected according to the actual situation, for example, a resistor with a resistance of more than 100 ohms can be selected. In addition, any two of the bleeder switches 131 of the bleeder unit 13 are grounded, and when the switching state of the bleeder switch 131 is on, the Q value of the antenna unit 11 is rapidly decreased, and at this time, the residual energy in the antenna unit 11 is rapidly discharged through the ground.
To further explain the working principle of the high-pressure bleed-off compensation device of the three-dimensional nuclear magnetic resonance imager provided in this embodiment, the high-pressure bleed-off compensation device of the three-dimensional nuclear magnetic resonance imager shown in fig. 2 is taken as an example:
first, the antenna switch 14 in the first antenna transmission module 10 is controlled to be closed, the antenna switch 14 in the second antenna transmission module 10 and the antenna switch 14 in the third antenna transmission module 10 are controlled to be opened, and the first antenna transmission module 10 is controlled to start transmitting the nuclear magnetic resonance signal. At this time, in order to reduce the nuclear magnetic resonance coupling effect between the antenna emission modules 10 and ensure the stability and accuracy of the nuclear magnetic resonance signal frequency emitted by the first antenna emission module 10, tuning capacitance values corresponding to the second antenna emission module 10 and the third antenna emission module 10 may be unequal to the tuning capacitance value of the first antenna emission module 10 by controlling tuning capacitance values corresponding to the tuning capacitance groups 12.
Subsequently, after the first antenna transmission module 10 completes the transmission of the nuclear magnetic resonance signal, the bleeding switch 131 in the first antenna transmission module 10 is closed, so that the bleeding unit 13 starts to bleed off the remaining energy in the first antenna transmission module 10. Preferably, while the bleeding unit 13 starts to bleed off the remaining energy in the first antenna transmission module 10, the antenna switches 14 in the second antenna transmission module 10 and the third antenna transmission module 10 are closed, and the tuning capacitor sets 12 are tuned so that the tuning capacitance values corresponding to the second antenna transmission module 10 and the third antenna transmission module 10 are equal to the tuning capacitance value corresponding to the first antenna transmission module 10; in other words, in the process of discharging the remaining energy of the first antenna transmission module 10, in order to complete the discharging process more quickly, on the basis of using the discharging unit 13 of the first antenna transmission module 10 itself, the coupling phenomenon of the nuclear magnetic resonance signals between the antenna transmission modules 10 can be used to assist the first antenna transmission module 10 to discharge energy quickly, so that the speed of discharging energy is effectively increased.
Then, similar steps can be adopted to sequentially control the signal transmission and energy release of the second antenna transmission module 10 and the signal transmission and energy release of the third antenna transmission module 10. That is, the echo interval time of the nuclear magnetic signal can be effectively reduced by the above method.
In addition, on the basis of the above manner, after the signal transmission and energy release of the first antenna transmission module 10, the signal transmission and energy release of the second antenna transmission module 10, and the signal transmission and energy release of the third antenna transmission module 10 are sequentially completed, the tuning capacitor bank 12 in the first antenna transmission module 10 may be adjusted again, so that the first antenna transmission module 10 may transmit nuclear magnetic resonance signals of other transmission frequencies. That is to say, the three-dimensional nuclear magnetic resonance imager high pressure compensation arrangement that releases that this embodiment provided can realize the transmission of nuclear magnetic resonance signal under a plurality of frequencies, further improves the measurement efficiency in the measurement process, also is convenient for the user to use.
The high-pressure discharge compensation device of the three-dimensional nuclear magnetic resonance imager provided by the first embodiment of the invention is provided with at least two antenna emission modules; each antenna emission module is respectively connected with the three-dimensional nuclear magnetic resonance imager main body and sequentially emits nuclear magnetic resonance signals under the control of the three-dimensional nuclear magnetic resonance imager main body; the antenna transmitting module comprises an antenna unit, a tuning capacitor set, a bleeder unit and an antenna switch; the antenna unit is connected with the three-dimensional nuclear magnetic resonance imager main body through the antenna switch and used for transmitting the nuclear magnetic resonance signal; the tuning capacitor bank is connected with the antenna unit in parallel and used for tuning the frequency of the nuclear magnetic resonance signal; the discharge unit is connected in parallel with the antenna unit and used for discharging residual energy of the antenna emission module after emission is completed. And each antenna emission module is provided with a discharge unit connected with the antenna unit in parallel, so that the discharge unit can rapidly discharge the residual energy of the antenna emission module after the emission is finished, and the echo interval time of the nuclear magnetic signals is effectively reduced.
The second embodiment of the present invention provides a high-pressure bleed-off compensation method for a three-dimensional nuclear magnetic resonance imager, and it should be noted that the high-pressure bleed-off compensation method for a three-dimensional nuclear magnetic resonance imager provided by the second embodiment of the present invention can be used in the high-pressure bleed-off compensation device for a three-dimensional nuclear magnetic resonance imager described in fig. 1 or fig. 2.
The high-pressure discharge compensation method of the three-dimensional nuclear magnetic resonance imager comprises the following steps:
controlling each antenna transmitting module to sequentially transmit nuclear magnetic resonance signals with preset frequency; when one of the antenna emission modules emits a nuclear magnetic resonance signal, the frequency of the nuclear magnetic resonance signal corresponding to the other antenna emission modules is not the preset frequency; after one of the antenna transmission modules transmits the nuclear magnetic resonance signal and before the next antenna transmission module transmits the nuclear magnetic resonance signal, the bleeder unit in the one of the antenna transmission modules is conducted, so that the residual energy in the one of the antenna transmission modules is discharged.
In an optional implementation manner, after the bleeding unit in one of the antenna transmission modules is turned on, and before the next antenna transmission module transmits the nuclear magnetic resonance signal, the method further includes: and controlling the antenna switches of other antenna transmitting modules to be conducted.
Fig. 3 is a schematic flow chart of a high-pressure bleed-off compensation method for a three-dimensional nuclear magnetic resonance imager according to a second embodiment of the present invention, and as shown in fig. 3, the method includes:
step 102, controlling an antenna switch corresponding to a current antenna transmitting module to enable the current antenna transmitting module to transmit a nuclear magnetic resonance signal with a preset frequency; the frequency of the nuclear magnetic resonance signal corresponding to other antenna transmitting modules except the antenna transmitting module is not equal to the preset frequency;
and 103, controlling a bleeding unit of the current antenna transmitting module and bleeding the residual energy in the current antenna transmitting module.
104, judging whether nuclear magnetic resonance signal transmission of all antenna transmission modules under the preset frequency is finished or not;
if yes, ending; if not, go to step 105.
And 105, selecting the next antenna transmitting module as the current antenna transmitting module, and returning to the step 102.
Furthermore, after step 103, the method may further include: tuning the tuning capacitance values of other antenna transmitting modules except the current antenna transmitting module and closing the corresponding antenna switches so as to enable the frequencies of the nuclear magnetic resonance signals corresponding to the other antenna transmitting modules to be equal to the preset frequency. At this time, the other antenna transmitting modules will utilize the resonance coupling effect to assist the bleeding unit in one of the antenna transmitting modules in bleeding the residual energy. That is to say, in the present invention, when any antenna transmitting module is in the transmitting stage, the frequencies of the nuclear magnetic resonance signals corresponding to other antenna transmitting modules are different from the antenna transmitting module in the transmitting stage, so that the coupling effect between the plurality of antenna transmitting modules does not occur in the transmitting stage; when the transmission of any antenna transmission module is finished and before the transmission of the next antenna transmission module, the residual energy in any antenna transmission module needs to be released, at this time, while the release is performed by using the release unit, the occurrence of the release of the residual energy can be accelerated by using the coupling effect between the antenna transmission modules, that is, the antenna switches of other antenna transmission modules can be controlled to be turned on at this stage, so that the frequency of the nuclear magnetic resonance signal of other antenna transmission modules is consistent with the preset frequency of any antenna transmission module, and the effect of auxiliary release by using the coupling effect is realized. In addition, after the nuclear magnetic resonance signals of all the antenna transmitting modules under the preset frequency are transmitted, the tuning capacitance values of the tuning capacitor groups can be adjusted again, so that the preset frequency of the nuclear magnetic resonance signals corresponding to the tuning capacitor groups is changed; returning to step 101.
It should be noted that the principle and the structure based on the high-pressure bleed-off compensation method of the three-dimensional nuclear magnetic resonance imager may refer to a corresponding part of the first embodiment, and details of the second embodiment are not repeated.
The high-pressure discharge compensation method of the three-dimensional nuclear magnetic resonance imager provided by the embodiment II of the invention is provided with at least two antenna emission modules; each antenna emission module is respectively connected with the three-dimensional nuclear magnetic resonance imager main body and sequentially emits nuclear magnetic resonance signals under the control of the three-dimensional nuclear magnetic resonance imager main body; the antenna transmitting module comprises an antenna unit, a tuning capacitor set, a bleeder unit and an antenna switch; the antenna unit is connected with the three-dimensional nuclear magnetic resonance imager main body through the antenna switch and used for transmitting the nuclear magnetic resonance signal; the tuning capacitor bank is connected with the antenna unit in parallel and used for tuning the frequency of the nuclear magnetic resonance signal; the discharge unit is connected in parallel with the antenna unit and used for discharging residual energy of the antenna emission module after emission is completed. And each antenna emission module is provided with a discharge unit connected with the antenna unit in parallel, so that the discharge unit can rapidly discharge the residual energy of the antenna emission module after the emission is finished, and the echo interval time of the nuclear magnetic signals is effectively reduced.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The utility model provides a three-dimensional magnetic resonance imager high pressure compensation arrangement that releases which characterized in that includes: at least two antenna transmission modules;
each antenna emission module is respectively connected with the three-dimensional nuclear magnetic resonance imager main body and sequentially emits nuclear magnetic resonance signals under the control of the three-dimensional nuclear magnetic resonance imager main body;
the antenna transmitting module comprises an antenna unit, a tuning capacitor set, a bleeder unit and an antenna switch; the antenna unit is connected with the three-dimensional nuclear magnetic resonance imager main body through the antenna switch and used for transmitting the nuclear magnetic resonance signal; the tuning capacitor bank is connected with the antenna unit in parallel and used for tuning the frequency of the nuclear magnetic resonance signal; the discharge unit is connected with the antenna unit in parallel and used for discharging residual energy of the antenna emission module after the emission is finished;
wherein, the antenna unit pass through antenna switch with three-dimensional nuclear magnetic resonance imager main part is connected, is used for launching the nuclear magnetic resonance signal includes:
controlling each antenna transmitting module to sequentially transmit nuclear magnetic resonance signals with preset frequency;
when one of the antenna emission modules emits a nuclear magnetic resonance signal, the frequency of the nuclear magnetic resonance signal corresponding to the other antenna emission modules is not the preset frequency; after one of the antenna emission modules emits a nuclear magnetic resonance signal and before the next antenna emission module emits the nuclear magnetic resonance signal, the bleeder unit in the one of the antenna emission modules is conducted so as to allow residual energy in the one of the antenna emission modules to be discharged;
after the bleeding unit in one of the antenna emission modules is conducted and before the next antenna emission module emits the nuclear magnetic resonance signal, the three-dimensional nuclear magnetic resonance imager main body controls the conduction of the antenna switches of the other antenna emission modules, so that the other antenna emission modules assist the bleeding unit in the one of the antenna emission modules in bleeding the residual energy; and the frequencies of the nuclear magnetic resonance signals corresponding to the other antenna transmitting modules are preset frequencies.
2. The high pressure relief compensation device of claim 1, wherein the at least two antenna emission modules are disposed on a same horizontal plane, and each of the at least two antenna emission modules is uniformly distributed along a circumference.
3. The three-dimensional MRI high pressure relief compensation device of claim 1, wherein said tuning capacitor bank comprises a main tuning capacitor and at least one sub-tuning capacitor bank;
the main tuning capacitor is connected in parallel with the at least one sub-tuning capacitor bank, wherein the sub-tuning capacitor bank comprises a sub-tuning capacitor and a tuning switch connected in series with the sub-tuning capacitor; the tuning switch is used for controlling the working state of the sub-tuning capacitor connected with the tuning switch.
4. The three-dimensional MRI high pressure bleed compensation apparatus of claim 3, wherein a capacitance value of said main tuning capacitor is greater than a capacitance value of each of said sub tuning capacitors.
5. The three-dimensional MRI high pressure relief compensation device of claim 4,
when the number of the sub-tuning capacitor groups is two or more, the capacitance values of the sub-tuning capacitors are different.
6. The three-dimensional nuclear magnetic resonance imager high-pressure relief compensation device of claim 1, wherein the number of the antenna switches in each antenna transmission module is two; and two ends of the antenna unit are respectively connected with the three-dimensional nuclear magnetic resonance imager main body through an antenna switch.
7. The three-dimensional MRI high pressure relief compensation device of claim 1, further comprising: an electronic short section;
the electronic short section is respectively connected with two ends of each antenna emission module and is also connected with the three-dimensional nuclear magnetic resonance imager main body.
8. The three-dimensional MRI high pressure relief compensation device of claim 1, wherein said relief unit comprises: the device comprises a bleeder switch and at least two bleeder resistors;
the bleeder switch and each bleeder resistor are connected in series, and any two of the at least two bleeder resistors are grounded.
9. A three-dimensional nuclear magnetic resonance imager high-pressure discharge compensation method based on the three-dimensional nuclear magnetic resonance imager high-pressure discharge compensation device of any one of claims 1 to 8, characterized by comprising the following steps:
controlling each antenna transmitting module to sequentially transmit nuclear magnetic resonance signals with preset frequency;
when one of the antenna emission modules emits a nuclear magnetic resonance signal, the frequency of the nuclear magnetic resonance signal corresponding to the other antenna emission modules is not the preset frequency;
after one of the antenna emission modules emits a nuclear magnetic resonance signal and before the next antenna emission module emits the nuclear magnetic resonance signal, the bleeder unit in the one of the antenna emission modules is conducted so as to allow residual energy in the one of the antenna emission modules to be discharged;
after the bleeding unit in one of the antenna transmission modules is turned on and before the next antenna transmission module transmits the nuclear magnetic resonance signal, the method further includes:
controlling the antenna switches of the other antenna transmitting modules to be conducted so that the other antenna transmitting modules assist the discharging unit in one of the antenna transmitting modules to discharge the residual energy; and the frequencies of the nuclear magnetic resonance signals corresponding to the other antenna transmitting modules are the preset frequencies.
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