CN112230171A - Magnetic resonance receiver, magnetic resonance system and signal receiving method - Google Patents
Magnetic resonance receiver, magnetic resonance system and signal receiving method Download PDFInfo
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- CN112230171A CN112230171A CN202010933641.8A CN202010933641A CN112230171A CN 112230171 A CN112230171 A CN 112230171A CN 202010933641 A CN202010933641 A CN 202010933641A CN 112230171 A CN112230171 A CN 112230171A
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- 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
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/34007—Manufacture of RF coils, e.g. using printed circuit board technology; additional hardware for providing mechanical support to the RF coil assembly or to part thereof, e.g. a support for moving the coil assembly relative to the remainder of the MR system
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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
- G01R33/4818—MR characterised by data acquisition along a specific k-space trajectory or by the temporal order of k-space coverage, e.g. centric or segmented coverage of k-space
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Abstract
The application relates to a magnetic resonance receiver, a magnetic resonance system and a signal receiving method. The magnetic resonance receiver comprises at least one radio frequency receiving coil, at least one radio frequency receiving component, a power supply and a processor; the radio frequency receiving coil is used for acquiring a first radio frequency signal generated by a magnetic resonance scanning object and inputting the first radio frequency signal to the radio frequency receiving component; the radio frequency receiving assembly is used for amplifying the first radio frequency signal to obtain a second radio frequency signal and inputting the second radio frequency signal to the processor; the power supply is used for supplying power to the at least one radio frequency receiving assembly; and the processor is used for inputting a power control signal to the power supply device according to the pre-acquired echo signal prediction curve and controlling the power supply device to adjust the power supply power. By adopting the method, the power consumption of the magnetic resonance receiver can be reduced.
Description
Technical Field
The present application relates to the field of magnetic resonance technology, and in particular, to a magnetic resonance receiver, a magnetic resonance system, and a signal receiving method.
Background
With the innovation of industrial technology, Magnetic Resonance Imaging (MRI) equipment is developing towards miniaturization and mobility. For example, in recent years, a type of ultra-low field (< 0.1T) and flexibly movable head and joint dedicated magnetic resonance imaging equipment is emerging in the industry.
In the miniaturization design of the device, the power consumption is a very important technical problem. Therefore, miniaturization of MRI leads to an urgent need to solve the problem of how to reduce power consumption.
Disclosure of Invention
In view of the above, it is necessary to provide a magnetic resonance receiver, a magnetic resonance system, and a signal receiving method that can reduce power consumption of a magnetic resonance apparatus.
A magnetic resonance receiver for a magnetic resonance system, the magnetic resonance receiver comprising at least one radio frequency receive coil, at least one radio frequency receive component, a power supply and a processor; the radio frequency receiving coils are connected with the radio frequency receiving components in a one-to-one corresponding manner; at least one radio frequency receiving component is respectively connected with the power supply and the processor;
the radio frequency receiving coil is used for acquiring a first radio frequency signal generated by a magnetic resonance scanning object and inputting the first radio frequency signal to the radio frequency receiving component;
the radio frequency receiving assembly is used for amplifying the first radio frequency signal to obtain a second radio frequency signal and inputting the second radio frequency signal to the processor;
the power supply is used for supplying power to the at least one radio frequency receiving assembly;
and the processor is used for inputting a power control signal to the power supply device according to the pre-acquired echo signal prediction curve and controlling the power supply device to adjust the power supply power.
In one embodiment, the processor comprises a controller; the controller is respectively connected with the power supply and an upper computer of the magnetic resonance system;
the controller is used for acquiring an echo signal prediction curve from the upper computer, determining a power control signal according to the echo signal prediction curve, controlling the power supply to be started at a first preset time before the radio frequency signal is sampled, and inputting the power control signal to the power supply at the first preset time.
In one embodiment, the processor further comprises a gain compensator; the gain compensator is respectively connected with the controller and the at least one radio frequency receiving assembly;
the controller is also used for determining a gain compensation signal according to the echo signal prediction curve and inputting the gain compensation signal to the gain compensator at a second preset time after the radio frequency signal is sampled;
and the gain compensator is used for performing gain compensation on the second radio frequency signal to obtain a third radio frequency signal.
In one embodiment, the processor further comprises a signal processor; the signal processor is respectively connected with the gain compensator and the upper computer;
and the signal processor is used for carrying out data processing on the third radio frequency signal to obtain K space data and inputting the K space data into the upper computer.
In one embodiment, the signal processor includes a signal processing unit and a data packing unit; the signal processing unit is respectively connected with the gain compensator and the data packing unit, and the data packing unit is also connected with the upper computer;
the signal processing unit is used for performing decimation filtering processing on the third radio frequency signal to obtain K space data;
and the data packing unit is used for packing the K space data and inputting the packed K space data into the upper computer.
In one embodiment, the magnetic resonance receiver further comprises a switch; the switch is respectively connected with the at least one radio frequency receiving coil and the at least one radio frequency receiving assembly and the processor;
the processor is also used for outputting a first switch control signal to the switch before controlling the power supply to be started; and after controlling the power supply to close, outputting a second switch control signal to the switch;
and the switch is closed after receiving the first switch control signal and is opened after receiving the second switch control signal.
In one embodiment, each radio frequency receiving component comprises an analog-to-digital converter and at least one amplifier; the amplifier is respectively connected with the switch and the analog-to-digital converter, and the analog-to-digital converter is also connected with the processor;
the amplifier is used for carrying out signal amplification processing on the first radio frequency signal;
and the analog-to-digital converter is used for performing analog-to-digital conversion on the amplified radio frequency signal to obtain a second radio frequency signal and inputting the second radio frequency signal to the processor.
A magnetic resonance system comprises the magnetic resonance receiver and an upper computer.
A signal receiving method is used for the magnetic resonance receiver, and the magnetic resonance receiver comprises at least one radio frequency receiving coil, at least one radio frequency receiving component, a power supply and a processor, wherein the power supply supplies power to the at least one radio frequency receiving component; the method comprises the following steps:
acquiring a first radio frequency signal generated by a magnetic resonance scanning object;
amplifying the first radio frequency signal to obtain a second radio frequency signal;
and inputting a power control signal to the power supply device according to the pre-acquired echo signal prediction curve, and controlling the power supply device to adjust the power supply power.
In one embodiment, the method further comprises:
optimizing the echo signal prediction curve according to the parameter information of the magnetic resonance scanning object
In the magnetic resonance receiver, the magnetic resonance system and the signal receiving method, the magnetic resonance receiver comprises at least one radio frequency receiving coil, at least one radio frequency receiving component, a power supply and a processor; the power supply device supplies power to the radio frequency receiving assembly, the processor generates a power control signal according to the echo signal prediction curve and inputs the power control signal to the power supply device, and the power supply device adjusts the power supply power in time according to the power control signal. When the amplitude of the first radio frequency signal acquired by the magnetic resonance receiver is reduced, the power supply power is reduced, so that the power consumption of the magnetic resonance receiver can be reduced, and the magnetic resonance system is ready for miniaturization.
Drawings
Figure 1 is one of the schematic structural diagrams of a magnetic resonance receiver in one embodiment;
FIG. 2 is a second schematic diagram of an embodiment of a magnetic resonance receiver;
FIG. 3 is a third schematic diagram of an exemplary MR receiver;
FIG. 4 is a graphical illustration of supply power and gain in one embodiment;
FIG. 5 is a block diagram of a signal processor according to an embodiment;
figure 6 is a fourth schematic diagram of the structure of a magnetic resonance receiver in one embodiment;
FIG. 7 is a schematic diagram of the timing of the switches in one embodiment;
FIG. 8 is a schematic diagram of an embodiment of an RF receiving assembly;
figure 9 is a schematic diagram of the structure of a magnetic resonance system in one embodiment;
fig. 10 is a flowchart illustrating steps of a signal receiving method according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
A magnetic resonance receiver is provided for a magnetic resonance system. As shown in fig. 1, the magnetic resonance receiver comprises at least one radio frequency receive coil 10, at least one radio frequency receive component 20, a power supply 30 and a processor 40; the radio frequency receiving coils 10 are connected with the radio frequency receiving components 20 in a one-to-one correspondence manner; the at least one radio frequency receiving assembly 20 is respectively connected with the power supply 30 and the processor 40; the radio frequency receiving coil 10 is used for acquiring a first radio frequency signal generated by a magnetic resonance scanning object and inputting the first radio frequency signal to the radio frequency receiving component 20; the radio frequency receiving component 20 is configured to amplify the first radio frequency signal to obtain a second radio frequency signal, and input the second radio frequency signal to the processor 40; a power supply 30 for supplying power to the at least one radio frequency receiving component 20; and the processor 40 is configured to input a power control signal to the power supplier 30 according to the pre-acquired echo signal prediction curve, and control the power supplier 30 to adjust the power supply power.
The magnetic resonance receiver comprises at least one radio frequency receiving coil 10 and at least one radio frequency receiving component 20, wherein one radio frequency receiving coil 10 is correspondingly connected with one radio frequency receiving component 20. The magnetic resonance receiver further comprises a power supply 30, each radio frequency receiving component 20 is connected to the power supply 30, and the power supply 30 supplies power to the radio frequency receiving components 20. The magnetic resonance receiver further comprises a processor 40, the processor 40 being connected to the at least one radio frequency receiving component 20 and the power supply 30, respectively. The processor 40 may be an FPGA (Field-Programmable Gate Array), a CPU (Central Processing Unit), an MCU (micro control Unit), a DSP (Digital Signal Processing), etc., which is not limited in this disclosure.
During operation of the magnetic resonance receiver, the radio frequency receiving coil 10 acquires a first radio frequency signal generated by a subject being scanned by magnetic resonance, and transmits the first radio frequency signal to the corresponding radio frequency receiving component 20. Since the first rf signal is very weak, the rf receiving component 20 amplifies the first rf signal to obtain a second rf signal. Thereafter, the rf receiving component 20 inputs the second rf signal to the processor 40. After receiving the second radio frequency signal, the processor 40 processes the second radio frequency signal to obtain K-space data, and inputs the K-space data to an upper computer of the magnetic resonance system.
During the operation of the magnetic resonance receiver, the processor 40 acquires an echo signal prediction curve from an upper computer of the magnetic resonance system in advance, generates a power control signal from the echo signal prediction curve, and inputs the power control signal to the power supply unit 30. The echo signal prediction curve is obtained by predicting the echo signal by an upper computer of the magnetic resonance system according to a scanning sequence. In addition, the upper computer may further perform optimization processing on the echo signal prediction curve in combination with parameter information of the magnetic resonance scanning object, such as height, weight, body type, and the like.
The power supplier 30 receives the power control signal input by the processor 40 and adjusts the amount of the power supply according to the power control signal. The first radio frequency signal has a sparse characteristic in a time domain, the power supply power of the power supply 30 changes along with the change of the first radio frequency signal, the amplitude of the first radio frequency signal becomes smaller, and the power supply power of the power supply 30 also becomes smaller; the signal amplitude of the first rf signal becomes larger, and the power supply of the power supply 30 becomes larger accordingly. The variation of the power supply can be realized by adjusting the power supply current or the power supply voltage output by the power supply 30.
In the magnetic resonance receiver, the processor generates a power control signal according to the echo signal prediction curve, and inputs the power control signal into the power supply device, and the power supply device adjusts the power supply power in time according to the power control signal. When the amplitude of the first radio frequency signal acquired by the magnetic resonance receiver is reduced, the power supply power is reduced, so that the power consumption of the magnetic resonance receiver can be reduced, and the magnetic resonance system is ready for miniaturization.
In one embodiment, as shown in FIG. 2, processor 40 includes a controller 401; the controller 401 is respectively connected with the power supply 30 and an upper computer of the magnetic resonance system; the controller 401 is configured to obtain an echo signal prediction curve from an upper computer, determine a power control signal according to the echo signal prediction curve, control the power supply 30 to be turned on at a first preset time before sampling the radio frequency signal, and input the power control signal to the power supply 30 at the first preset time.
The controller 401 acquires the echo signal prediction curve from the upper computer, determines the amplitude change of the echo signal according to the echo signal prediction curve, and then the controller 401 generates a power control signal according to the amplitude change of the echo signal, that is, the power control signal corresponds to the amplitude change of the echo signal. Since the power supplier 30 has a time delay, the controller 401 controls the power supplier 30 to turn on at a first preset time before the rf signal is sampled, and simultaneously, inputs a power control signal to the power supplier 30 at the first preset time to control the power supplied from the power supplier 30 to the rf receiving component 20.
In one embodiment, as shown in fig. 3, the processor 40 may further include a memory 402, and the memory 402 is connected to the controller 401 and the power supplier 30, respectively. The controller 401 acquires the echo signal prediction curve from the upper computer, determines the amplitude change of the echo signal according to the echo signal prediction curve, and then the controller 401 generates a power control signal according to the amplitude change of the echo signal, that is, the power control signal corresponds to the amplitude change of the echo signal. After that, the controller 401 inputs the power control signal to the memory 402, and the memory 402 stores the power control signal. The controller 401 controls the power supplier 30 to be turned on at a first preset time before the rf signal is sampled, and meanwhile, the memory 402 inputs a power control signal to the power supplier 30 at the first preset time to control the power supplier 30 to output the power to the rf receiving component 20.
As shown in the power supply curve of fig. 4, the time delay of the power supply 30 itself is Δ T1, and the controller 401 controls the power supply 30 to turn on before the sampling start time of the rf signal by a first preset time T1 that is Δ T1 from the sampling start time of the rf signal, so that the power supply 30 starts outputting the power supply. Meanwhile, the memory 402 sends the power control signal to the power supplier 30 at a first preset time T1 spaced from the sampling start time Δ T1 of the rf signal before the sampling start time of the rf signal, so that the power supplier 30 can adjust the output power of the power supplier according to the power control signal.
In the magnetic resonance receiver, the processor comprises a controller, the controller acquires an echo signal prediction curve from an upper computer, determines a power control signal according to the echo signal prediction curve, controls the power supply to be started at a first preset time before the radio frequency signal is sampled, and inputs the power control signal to the power supply at the first preset time. The processor may also include a memory that stores the power control signal. Through the embodiment of the disclosure, the controller can independently control the power supply power output by the power supply device, and the controller and the memory can also be combined to control the power supply power output by the power supply device, so that the power supply device can reduce the output power supply when the amplitude of the echo signal is reduced, thereby reducing the power consumption of the magnetic resonance receiver and preparing for realizing the miniaturization of the magnetic resonance system.
In one embodiment, as shown in fig. 3, processor 40 further includes a gain compensator 403; the gain compensator 403 is respectively connected to the controller 401 and the at least one rf receiving component 20; the controller 401 is further configured to determine a gain compensation signal according to the echo signal prediction curve, and input the gain compensation signal to the gain compensator 403 at a second preset time after the radio frequency signal is sampled; the gain compensator 403 is configured to perform gain compensation on the second radio frequency signal to obtain a third radio frequency signal.
Since the power of the power supply 30 changes with the change of the first rf signal, the gain of the rf receiving component 20 also changes with the change of the power supply 30. The supply power of the power supply 30 is related to the supply current and the supply voltage, so the gain of the rf receiving component 20 can be seen as a function of the supply current and the supply voltage.
To stabilize the gain of the radio frequency receive component 20, the processor 40 of the magnetic resonance receiver is further provided with a gain compensator 403. The gain compensator 403 is connected to the controller 401 and each rf receiving module 20. After the echo signal prediction curve is acquired, the controller 401 determines the amplitude change of the echo signal according to the echo signal prediction curve, and then generates a gain compensation signal according to the amplitude change of the echo signal. I.e. the gain of the rf receiving component 20 is compensated when the power supply 30 is controlled to reduce the supply power.
Since the rf receiving component 20 generates a time delay during the process of amplifying the first rf signal, the controller 401 inputs the gain compensation signal to the gain compensator 403 at a second preset time after the rf signal is sampled, so that the gain compensator 403 can perform gain compensation on the second rf signal according to the gain compensation signal, thereby obtaining a third rf signal.
In one embodiment, as shown in fig. 3, the processor 40 further includes a memory 402, and the memory 402 is further connected to the gain compensator 403. The controller 401 inputs the gain compensation signal into the memory 402 for storage. The memory 402 inputs the gain compensation signal to the gain compensator 403 at a second preset time after the sampling of the rf signal, so that the gain compensator 403 can perform gain compensation on the second rf signal according to the gain compensation signal, thereby obtaining a third rf signal.
As shown in the gain curve of fig. 4, the time delay of the rf receiving component 20 is Δ T2, and the memory 402 inputs the gain compensation signal to the gain compensator 403 after the sampling start time of the rf signal and at a second preset time T2 spaced from the sampling start time Δ T2, so that the gain compensator 403 can perform gain compensation on the second rf signal.
In the magnetic resonance receiver, the processor is further provided with a gain compensator, and the gain compensator performs gain compensation on the second radio-frequency signal output by the radio-frequency receiving assembly, so that errors in subsequent signal processing can be avoided.
In one embodiment, as shown in FIG. 3, processor 40 also includes a signal processor 404; the signal processor 404 is respectively connected with the gain compensator 403 and the upper computer; and the signal processor 404 is configured to perform data processing on the third radio frequency signal to obtain K-space data, and input the K-space data to the upper computer.
The processor 40 of the magnetic resonance receiver is further provided with a signal processor 404, and the signal processor 404 is connected with the gain compensator 403 and the upper computer of the magnetic resonance system respectively. The gain compensator 403 performs gain compensation on the rf receiving module 20 to obtain a third rf signal, and then the gain compensator 403 inputs the third rf signal to the signal processor 404. The signal processor 404 performs data processing on the third radio frequency signal input by the gain compensator 403 to obtain K-space data, and finally inputs the K-space data to the upper computer.
In one embodiment, as shown in fig. 5, the signal processor 404 includes a signal processing unit 4041 and a data packing unit 4042; the signal processing unit 4041 is connected to the gain compensator 403 and the data packing unit 4042, respectively, and the data packing unit 4042 is further connected to the upper computer; the signal processing unit 4041 is configured to perform decimation filtering processing on the third radio frequency signal to obtain K-space data; the data packing unit 4042 is configured to pack the K-space data, and input the packed K-space data to the upper computer.
The signal processor 404 is provided with two units, a signal processing unit 4041 and a data packing unit 4042, respectively. The signal processing unit 4041 is connected to the gain compensator 403 and the data packing unit 4042, respectively, and the data packing unit 4042 is connected to the signal processing unit 4041 and the upper computer of magnetic resonance.
In the signal processing process, the signal processing unit 4041 performs decimation filtering processing on the third radio frequency signal to obtain K-space data, and then the signal processing unit 4041 transmits the K-space data to the data packing unit 4042. After the data packing unit 4042 receives the K-space data transmitted by the signal processing unit 4041, the K-space data is packed, and finally, the data packing unit 4042 inputs the packed K-space data to the upper computer of the magnetic resonance.
In the magnetic resonance receiver, the processor is further provided with a signal processor, the signal processor comprises a signal processing unit and a data packing unit, and the signal processing unit performs extraction filtering processing on the third radio frequency signal to obtain K space data; and the data packing unit is used for packing the K space data and inputting the packed K space data into the upper computer of the magnetic resonance. Through this disclosed embodiment, can convert radio frequency signal into K space data, the upper computer receives the K space data after the packing, can carry out processing such as image reconstruction according to K space data.
In one embodiment, as shown in figure 6, the magnetic resonance receiver further comprises a switch 50; the switch 50 is respectively connected with the at least one radio frequency receiving coil 10, the at least one radio frequency receiving assembly 20 and the processor 40; the processor is also used for outputting a first switch control signal to the switch 50 before controlling the power supply 30 to be started; and outputting a second switch control signal to the switch 50 after controlling the power supplier 30 to be turned off; and a switch 50 for being closed after receiving the first switch control signal and being opened after receiving the second switch control signal.
When the radio frequency signal is transmitted in high power, even if the radio frequency receiving coil 10 is in a detuning state, a very large signal will be leaked to the magnetic resonance receiver, which causes an excessive supply current in the magnetic resonance receiver, and even causes the reliability problem of the device. Thus, in the magnetic resonance receiver, a switch 50 is provided between the radio frequency receive coil 10 and the radio frequency receive assembly 20. Before the processor 40 controls the power supply 30 to be turned on, the processor 30 outputs a first switch control signal to the switch 50, and controls the switch 50 to be closed, so that the rf receiving coil 10 can transmit the first rf signal to the rf receiving component 20 through the switch 50 after receiving the first rf signal. After the processor 40 controls the power supply 30 to be turned off, the processor 40 outputs a second switch control signal to the switch 50, controls the switch 50 to be turned off, cuts off signal transmission between the radio frequency receiving coil 10 and the radio frequency receiving component 20, and avoids the signal from leaking to the radio frequency receiving component 20, so that the power supply current in the magnetic resonance receiver can be prevented from being too large, and the reliability of the device can be improved.
In one embodiment, the switch 50 is connected to a controller 401 in the processor 40, the controller 401 generates a switch control signal according to the echo signal prediction curve, and sends a first switch control signal to the switch 50 before the power supplier 30 starts to supply power to the rf receiving component 20, so as to control the switch 50 to be closed; the second switch control signal is transmitted to the switch 50 after the power supplier 30 stops supplying power to the rf receiving assembly 20, thereby controlling the switch 50 to be turned off.
In one embodiment, as shown in fig. 6, a plurality of switches 50 may be connected in series between the radio frequency receive coil 10 and the radio frequency receive assembly 20. In this way, it is ensured that the signal transmission between the radio frequency receiving coil 10 and the radio frequency receiving component 20 is cut off after the power supplier 30 stops supplying power to the radio frequency receiving component 20, and therefore, the reliability of the device can be further improved. The number of switches 50 is not limited in the disclosed embodiment.
As shown in the switch timing sequence of fig. 7, when the magnetic resonance receiver is in the signal receiving state (ADC), the switch 50 is closed; when the magnetic resonance system is in a radio frequency transmit state (RF), the switch 50 is open; the switch 50 may be in any state when the magnetic resonance receiver is in the other state (IDLE). In order to ensure that the RF and ADC are in a stable switching state, the switching timing needs to be left with enough margin before and after the RF or ADC.
In the magnetic resonance receiver, a switch is arranged between the radio frequency receiving coil and the radio frequency receiving component, the processor outputs a first switch control signal to the switch before controlling the power supply to be started, and the switch is controlled to be closed, so that the radio frequency receiving coil can transmit the first radio frequency signal received by the radio frequency receiving coil to the radio frequency receiving component. The processor outputs a second switch control signal to the switch after controlling the power supply to be closed, the switch is controlled to be switched off, signal transmission between the radio frequency receiving coil and the radio frequency receiving assembly is cut off, signals are prevented from leaking to the radio frequency receiving assembly, and reliability of the device is improved.
In one embodiment, as shown in fig. 8, each radio frequency receiving component 20 includes an analog-to-digital converter 201 and at least one amplifier 202; the amplifier 202 is respectively connected with the switch 50 and the analog-to-digital converter 201, and the analog-to-digital converter 201 is also connected with the processor 40; an amplifier 202, configured to perform signal amplification processing on the first radio frequency signal; the analog-to-digital converter 201 is configured to perform analog-to-digital conversion on the amplified radio frequency signal to obtain a second radio frequency signal, and input the second radio frequency signal to the processor 40.
Each radio frequency receiving component 20 of the magnetic resonance receiver may comprise an analog to digital converter 201 and a plurality of amplifiers 202, wherein the plurality of amplifiers 202 are connected in series, a first amplifier 202 being connected to the switch 50 and a last amplifier 202 being connected to the analog to digital converter 201. The analog-to-digital converter 201 is connected to the processor 40.
After receiving the first radio frequency signal, the radio frequency receiving coil 10 transmits the first radio frequency signal to the first amplifier 202 through the switch 50; then, the plurality of amplifiers 202 connected in sequence amplify the first radio frequency signal step by step, and the last amplifier 202 inputs the amplified radio frequency signal to the analog-to-digital converter 201. After receiving the amplified radio frequency signal, the analog-to-digital converter 201 performs analog-to-digital conversion on the amplified radio frequency signal to obtain a second radio frequency signal. The analog-to-digital converter 201 then inputs the second radio frequency signal to the processor 40.
In one embodiment, amplifier 202 is a low noise amplifier. The number of amplifiers 202 is not limited in the embodiments of the present disclosure.
The radio frequency receiving component of the magnetic resonance receiver comprises an analog-to-digital converter and at least one amplifier, wherein the amplifier can amplify a weak first radio frequency signal, and the analog-to-digital converter can perform analog-to-digital conversion on the amplified radio frequency signal. Through the embodiment of the disclosure, the radio frequency receiving component amplifies and performs analog-to-digital conversion on the first radio frequency signal so as to facilitate subsequent processing by the processor.
The present application provides a magnetic resonance system, as shown in figure 9, comprising a magnetic resonance receiver and a host computer as in the above embodiments.
The magnetic resonance receiver comprises at least one radio frequency receiving coil 10, at least one radio frequency receiving component 20, a power supply 30 and a processor 40; the radio frequency receiving coils 10 are connected with the radio frequency receiving components 20 in a one-to-one correspondence manner; the at least one radio frequency receiving assembly 20 is respectively connected with the power supply 30 and the processor 40; the radio frequency receiving coil 10 is used for acquiring a first radio frequency signal generated by a magnetic resonance scanning object and inputting the first radio frequency signal to the radio frequency receiving component 20; the radio frequency receiving component 20 is configured to amplify the first radio frequency signal to obtain a second radio frequency signal, and input the second radio frequency signal to the processor 40; a power supply 30 for supplying power to the at least one radio frequency receiving component 20; and the processor 40 is configured to input a power control signal to the power supplier 30 according to the pre-acquired echo signal prediction curve, and control the power supplier 30 to adjust the power supply power.
The magnetic resonance receiver further comprises a switch 50; the switch 50 is respectively connected with the at least one radio frequency receiving coil 10, the at least one radio frequency receiving assembly 20 and the processor 40; the processor 40 is further configured to output a first switch control signal to the switch 50 before controlling the power supplier 30 to be turned on; and outputting a second switch control signal to the switch 50 after controlling the power supplier 30 to be turned off; and a switch 50 for being closed after receiving the first switch control signal and being opened after receiving the second switch control signal.
In the magnetic resonance system, the magnetic resonance receiver can adjust the power supply power according to the amplitude of the echo signal, so that the power consumption of the magnetic resonance receiver is reduced, and further, the miniaturization of the magnetic resonance system is prepared.
The present application also provides a signal receiving method, which can be used in the magnetic resonance receiver of the above embodiments, where the magnetic resonance receiver includes at least one radio frequency receiving coil, at least one radio frequency receiving component, a power supply and a processor, and the power supply supplies power to the at least one radio frequency receiving component; as shown in fig. 10, the method may include the steps of:
in step 601, a magnetic resonance receiver acquires a first radio frequency signal generated by a magnetic resonance scanning object.
The magnetic resonance receiver includes at least one radio frequency receive coil by which first radio frequency signals generated by a magnetic resonance scanning of the subject are acquired.
The magnetic resonance receiver comprises at least one radio frequency receiving assembly, the radio frequency receiving coil transmits the acquired first radio frequency signals to the corresponding radio frequency receiving assembly, and the radio frequency receiving assembly amplifies the first radio frequency signals to obtain second radio frequency signals.
Each radio frequency receiving assembly comprises an analog-to-digital converter and at least one amplifier; the first radio frequency signal is input into a first amplifier, a plurality of amplifiers which are connected in sequence amplify the first radio frequency signal step by step, and the last amplifier inputs the amplified radio frequency signal into an analog-to-digital converter. The analog-to-digital converter receives the amplified radio frequency signal and performs analog-to-digital conversion on the amplified radio frequency signal to obtain a second radio frequency signal.
The magnetic resonance receiver further comprises a processor comprising a controller, a memory, a gain compensator and a signal processor comprising a signal processing unit and a data packing unit.
The controller acquires an echo signal prediction curve from the upper computer, determines a power control signal and a gain compensation signal according to the echo signal prediction curve, and inputs the power control signal and the gain compensation signal into the memory. The memory stores the power control signal and the gain compensation signal.
In one embodiment, the echo signal prediction curve is obtained by predicting the echo signal according to a scanning sequence by an upper computer of the magnetic resonance system.
In one embodiment, the upper computer may further perform optimization processing on the echo signal prediction curve according to the parameter information of the magnetic resonance scanning object. The parameter information of the magnetic resonance scanning object may include height, weight, body type, and the like, which is not limited by the embodiments of the present disclosure.
And at the first preset time before the radio frequency signal is sampled, the controller controls the power supply to be started, the memory inputs the power control signal to the power supply, and the power supply is controlled to adjust the power supply power. And the memory inputs the gain compensation signal to the gain compensator at a second preset time after the radio frequency signal is sampled. The gain compensator performs gain compensation on the received second radio frequency signal to obtain a third radio frequency signal. And then, the signal processing unit performs extraction filtering processing on the third radio frequency signal to obtain K space data, and the K space data is input to the data packing unit. And the data packing unit is used for packing the received K space data and inputting the packed K space data into the upper computer.
In the signal receiving method, a magnetic resonance receiver acquires a first radio frequency signal generated by a magnetic resonance scanning object; amplifying the first radio frequency signal to obtain a second radio frequency signal; and inputting a power control signal to the power supply device according to the pre-acquired echo signal prediction curve, and controlling the power supply device to adjust the power supply power. In the embodiment of the disclosure, the magnetic resonance receiver can adjust the power supply power according to the amplitude of the echo signal, thereby reducing the power consumption of the magnetic resonance receiver and further providing for miniaturization of the magnetic resonance system.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A magnetic resonance receiver for use in a magnetic resonance system, the magnetic resonance receiver comprising at least one radio frequency receive coil, at least one radio frequency receive component, a power supply and a processor; the radio frequency receiving coils are connected with the radio frequency receiving components in a one-to-one corresponding manner; the at least one radio frequency receiving component is respectively connected with the power supply and the processor;
the radio frequency receiving coil is used for acquiring a first radio frequency signal generated by a magnetic resonance scanning object and inputting the first radio frequency signal to the radio frequency receiving component;
the radio frequency receiving assembly is used for amplifying the first radio frequency signal to obtain a second radio frequency signal and inputting the second radio frequency signal to the processor;
the power supplier is used for supplying power to the at least one radio frequency receiving component;
and the processor is used for inputting a power control signal to the power supply device according to the pre-acquired echo signal prediction curve and controlling the power supply device to adjust the power supply power.
2. The magnetic resonance receiver of claim 1, wherein the processor includes a controller; the controller is respectively connected with the power supply and an upper computer of the magnetic resonance system;
the controller is used for acquiring the echo signal prediction curve from the upper computer, determining the power control signal according to the echo signal prediction curve, controlling the power supply to be started at a first preset time before the radio frequency signal is sampled, and inputting the power control signal to the power supply at the first preset time.
3. The magnetic resonance receiver of claim 2, wherein the processor further includes a gain compensator; the gain compensator is respectively connected with the controller and the at least one radio frequency receiving component;
the controller is further used for determining a gain compensation signal according to the echo signal prediction curve and inputting the gain compensation signal to the gain compensator at a second preset time after the radio frequency signal is sampled;
and the gain compensator is used for performing gain compensation on the second radio frequency signal to obtain a third radio frequency signal.
4. The magnetic resonance receiver of claim 3, wherein the processor further comprises a signal processor; the signal processor is respectively connected with the gain compensator and the upper computer;
and the signal processor is used for carrying out data processing on the third radio frequency signal to obtain the K space data and inputting the K space data into the upper computer.
5. The MR receiver of claim 4, wherein the signal processor comprises a signal processing unit and a data packing unit; the signal processing unit is respectively connected with the gain compensator and the data packing unit, and the data packing unit is also connected with the upper computer;
the signal processing unit is configured to perform decimation filtering processing on the third radio frequency signal to obtain the K-space data;
and the data packing unit is used for packing the K space data and inputting the packed K space data into the upper computer.
6. The magnetic resonance receiver of claim 1, further comprising a switch; the switch is respectively connected with the at least one radio frequency receiving coil, the at least one radio frequency receiving assembly and the processor;
the processor is further used for outputting a first switch control signal to the switch before controlling the power supply to be started; and after controlling the power supplier to be switched off, outputting a second switch control signal to the switch;
the switch is used for being closed after receiving the first switch control signal and being opened after receiving the second switch control signal.
7. The receiver of claim 6, wherein each of the radio frequency receive components includes an analog-to-digital converter and at least one amplifier; the amplifier is respectively connected with the switch and the analog-to-digital converter, and the analog-to-digital converter is also connected with the processor;
the amplifier is used for carrying out signal amplification processing on the first radio frequency signal;
the analog-to-digital converter is used for performing analog-to-digital conversion on the amplified radio frequency signal to obtain the second radio frequency signal, and inputting the second radio frequency signal to the processor.
8. A magnetic resonance system, characterized in that the magnetic resonance system comprises a magnetic resonance receiver as claimed in any one of claims 1-7 and a host computer.
9. A signal receiving method for use in a magnetic resonance receiver as claimed in any one of claims 1 to 7, the magnetic resonance receiver comprising at least one radio frequency receive coil, at least one radio frequency receive component, a power supply and a processor, the power supply supplying power to the at least one radio frequency receive component; the method comprises the following steps:
acquiring a first radio frequency signal generated by a magnetic resonance scanning object;
amplifying the first radio frequency signal to obtain a second radio frequency signal;
and inputting a power control signal to the power supply device according to a pre-acquired echo signal prediction curve, and controlling the power supply device to adjust the power supply power.
10. The method of claim 9, further comprising:
and optimizing the echo signal prediction curve according to the parameter information of the magnetic resonance scanning object.
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