CN109917311B - Magnetic resonance multi-antenna radio frequency transmission device and magnetic resonance system - Google Patents
Magnetic resonance multi-antenna radio frequency transmission device and magnetic resonance system Download PDFInfo
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- CN109917311B CN109917311B CN201910220107.XA CN201910220107A CN109917311B CN 109917311 B CN109917311 B CN 109917311B CN 201910220107 A CN201910220107 A CN 201910220107A CN 109917311 B CN109917311 B CN 109917311B
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Abstract
The invention relates to a magnetic resonance multi-antenna radio frequency transmission device and a magnetic resonance system, belonging to the technical field of medical equipment. With wireless mode transmission magnetic resonance signal, because the shielding that uses in the special strong magnetic field's of magnetic resonance equipment structure, multipath effect can appear during the transmission signal, influences the receptivity, in this scheme, uses the receiving mode of multiaerial, can improve receiving efficiency to avoid using the radio frequency line transmission signal, simplify the workflow, reduce because of the cost of laying the cable.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to a magnetic resonance multi-antenna radio frequency transmission device and a magnetic resonance system.
Background
Nuclear Magnetic Resonance Imaging (NMRI), also known as spin Imaging (or MRI), uses the principle of Nuclear Magnetic Resonance to detect emitted electromagnetic waves by an external gradient Magnetic field according to different attenuations of released energy in different structural environments inside a substance, and obtains a structural image inside the object according to the electromagnetic waves.
The magnetic resonance system mainly comprises a magnet, a gradient coil, a radio frequency coil and a receiving link. The superconducting magnet generates a uniform static magnetic field, the hydrogen nuclei are excited by the radio frequency transmitting coil to self-revolve to generate magnetic resonance signals, the signals are subjected to spatial information encoding by the gradient coil, the magnetic resonance signals are collected by the radio frequency receiving coil and converted into digital signals through the receiving link, and finally, the magnetic resonance images are obtained through computer reconstruction.
The radio frequency receiving coil is an important component of the magnetic resonance system and has a decisive effect on the image quality of the magnetic resonance system. The array receiving coil is widely used at present and has the characteristics of high signal-to-noise ratio, flexible coverage range, convenience in use and the like.
The conventional rf coil uses an rf wire for transmitting rf signals, and usually uses an rf cable as a main component. The use of radio frequency cables complicates the scanning workflow, requires the coils to be patched, and the cost of cabling is prohibitively high, especially if the receive coils are integrated in a moving patient bed.
Disclosure of Invention
In view of the above, it is necessary to provide a magnetic resonance multi-antenna radio frequency transmission apparatus and a magnetic resonance system, which solve the problems of complicated workflow and high cost caused by the transmission of radio frequency signals by using radio frequency wires in the conventional radio frequency coil.
A magnetic resonance multi-antenna radio frequency transmission device comprises a radio frequency receiving coil and a radio frequency receiving device;
the radio frequency receiving coil is arranged in the magnetic resonance equipment and used for receiving the magnetic resonance signals and sending the magnetic resonance signals to the radio frequency receiving device in a wireless mode;
the radio frequency receiving device comprises a plurality of antennas and a radio frequency receiver, wherein the plurality of antennas respectively receive the magnetic resonance signals and transmit the magnetic resonance signals to the radio frequency receiver;
the radio frequency receiver is used for resolving the received magnetic resonance signals.
According to the magnetic resonance multi-antenna radio frequency transmission device, the magnetic resonance multi-antenna radio frequency transmission device comprises the radio frequency receiving coil and the radio frequency receiving device, the radio frequency receiving coil in the magnetic resonance equipment can collect magnetic resonance signals excited during magnetic resonance detection, the radio frequency receiving coil can send the magnetic resonance signals to the radio frequency receiving device in a wireless mode, the radio frequency receiving device comprises a plurality of antennas and a radio frequency receiver, the plurality of antennas can transmit the magnetic resonance signals to the radio frequency receiver, and the radio frequency receiver analyzes the magnetic resonance signals. With wireless mode transmission magnetic resonance signal, because the shielding that uses in the special strong magnetic field's of magnetic resonance equipment structure, multipath effect can appear during the transmission signal, influences the receptivity, in this scheme, uses the receiving mode of multiaerial, can improve receiving efficiency to avoid using the radio frequency line transmission signal, simplify the workflow, reduce because of the cost of laying the cable.
In one embodiment, the radio frequency receiving coil comprises a coil body, an analog-to-digital converter, a processor and a wireless transmitter which are connected in sequence;
the coil body is used for collecting magnetic resonance signals sent by a magnetic resonance detection object, the analog-to-digital converter is used for converting the magnetic resonance signals into digital signals, the processor is used for controlling the analog-to-digital converter and the wireless transmitter, and the wireless transmitter is used for transmitting the digital signals to the radio frequency receiving device in a wireless mode.
In one embodiment, the radio frequency receive coil further comprises an amplifier and a filter; the amplifier and the filter are sequentially connected between the coil body and the analog-to-digital converter;
the amplifier is used for amplifying the magnetic resonance signal, and the filter is used for filtering the amplified magnetic resonance signal.
In one embodiment, the radio frequency receiving device is a radio frequency receiving and transmitting device, the radio frequency receiving and transmitting device is used for transmitting control information and synchronization information to the radio frequency receiving coil, the processor receives the control information through the wireless transmitter, the control coil body starts to acquire magnetic resonance signals, the wireless transmitter adds the synchronization information in the magnetic resonance signals, and the added magnetic resonance signals are transmitted to the radio frequency receiving and transmitting device.
In one embodiment, the wireless transmitter is further configured to add a check code to the acquired magnetic resonance signals.
In one embodiment, the plurality of antennas includes a first antenna and a second antenna, and the radio frequency receiver performs spatially diverse reception of the magnetic resonance signals through the first antenna and the second antenna.
In one embodiment, the radio frequency receiving device is further configured to receive a monitoring signal of the magnetic resonance detection object, wherein the monitoring signal is at least one of heart motion, breathing motion and head motion.
In one embodiment, the monitoring signal and the magnetic resonance signal use different carrier frequencies when transmitted.
In one embodiment, the monitoring signal and the magnetic resonance signal are transmitted using time division multiple access, frequency division multiple access, or code division multiple access for distinguishing.
In one embodiment, the radio frequency receiver demodulates the monitoring signal and the magnetic resonance signal separately, and uses the same baseband processor to analyze the demodulated signals.
A magnetic resonance system comprises the magnetic resonance multi-antenna radio frequency transmission device.
According to the magnetic resonance system, the magnetic resonance multi-antenna radio frequency transmission device comprises a radio frequency receiving coil and a radio frequency receiving device, the radio frequency receiving coil in the magnetic resonance equipment can collect magnetic resonance signals excited during magnetic resonance detection, the radio frequency receiving coil can send the magnetic resonance signals to the radio frequency receiving device in a wireless mode, the radio frequency receiving device comprises a plurality of antennas and a radio frequency receiver, the plurality of antennas can transmit the magnetic resonance signals to the radio frequency receiver, and the radio frequency receiver analyzes the magnetic resonance signals. The magnetic resonance signal is transmitted in a wireless mode, due to the fact that shielding is used in the special high-intensity magnetic field structure of the magnetic resonance equipment, multipath effect can occur during signal transmission, receiving performance is affected, in the scheme, the receiving mode of the multiple antennas is used, receiving efficiency can be improved, the use of radio frequency wires for signal transmission is avoided, workflow is simplified, and cost of laying cables is reduced.
Drawings
FIG. 1 is a diagram of an embodiment of an MR multi-antenna RF transmission apparatus;
FIG. 2 is a schematic structural diagram of an MRI multi-antenna RF transmission apparatus according to another embodiment;
FIG. 3 is a schematic structural diagram of an MRI multi-antenna RF transmission apparatus in a further embodiment;
FIG. 4 is a schematic structural diagram of a magnetic resonance multi-antenna RF transmission apparatus in a further embodiment;
FIG. 5 is a diagram illustrating an actual structure of an MR multi-antenna RF transmitting device according to an embodiment;
FIG. 6 is a diagram illustrating an exemplary RF receive coil of the MR multi-antenna RF transmission apparatus;
FIG. 7 is a diagram illustrating an exemplary RF receiver of the MR multi-antenna RF transmission apparatus;
fig. 8 is a schematic diagram of an actual configuration of an rf receiving device disposed inside a magnet of an mr system in an embodiment of an mr multi-antenna rf transmitting device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
It should be noted that the term "first \ second" referred to in the embodiments of the present invention only distinguishes similar objects, and does not represent a specific ordering for the objects, and it should be understood that "first \ second" may exchange a specific order or sequence when allowed. It should be understood that "first \ second" distinct objects may be interchanged under appropriate circumstances such that embodiments of the invention described herein may be practiced in sequences other than those illustrated or described herein.
The magnetic resonance multi-antenna radio frequency transmission device can be applied to magnetic resonance equipment and used for magnetic resonance imaging. A typical magnetic resonance apparatus generally includes a magnetic resonance housing having a main magnet, which may be formed of superconducting coils, for generating a main magnetic field; during magnetic resonance imaging, an imaging object can be borne by a sickbed, the imaging object is moved into a region with uniform distribution of a main magnetic field along with movement of the sickbed, a pulse control unit in magnetic resonance equipment controls a radio-frequency pulse generation unit to generate radio-frequency pulses, the radio-frequency pulses are amplified by an amplifier and finally transmitted by a radio-frequency body coil or a local coil through a switch control unit, the imaging object is subjected to radio-frequency excitation, the imaging object can generate corresponding magnetic resonance signals through resonance according to the radio-frequency excitation, the corresponding magnetic resonance signals can be acquired by the radio-frequency body coil or the local coil, namely, a radio-frequency receiving coil acquires the signals, image reconstruction is performed according to the magnetic resonance signals, and a magnetic resonance image is formed.
The magnetic resonance multi-antenna radio frequency transmission device provided by the application can be mainly used in the process of receiving magnetic resonance signals.
Referring to fig. 1, a schematic structural diagram of an embodiment of a magnetic resonance multi-antenna radio frequency transmission apparatus is shown. The magnetic resonance multi-antenna radio frequency transmission device in the embodiment comprises a radio frequency receiving coil 100 and a radio frequency receiving device 200;
the radio frequency receiving coil 100 is arranged in the magnetic resonance device, and the radio frequency receiving coil 100 is used for sending the magnetic resonance signal to the radio frequency receiving device 200 in a wireless manner;
the rf receiving apparatus 200 includes a plurality of antennas 300 and an rf receiver 400, and receives the magnetic resonance signals through the plurality of antennas 300 and transmits the magnetic resonance signals to the rf receiver 400;
the radio frequency receiver 400 is used to resolve the received magnetic resonance signals.
In the present embodiment, the magnetic resonance multi-antenna radio frequency transmission device includes a radio frequency receiving coil 100 and a radio frequency receiving device 200, and the radio frequency receiving device 200 includes a plurality of antennas 300 and a radio frequency receiver 400; the radio frequency receiving coil 100 in the magnetic resonance apparatus is separately arranged from the sickbed, the magnet, the housing and other parts in the magnetic resonance apparatus, and can acquire a magnetic resonance signal excited during magnetic resonance detection, the radio frequency receiving coil 100 can transmit the magnetic resonance signal to the radio frequency receiving device 200 in a wireless manner, the plurality of antennas 300 can forward the magnetic resonance signal to the radio frequency receiver 400, and the radio frequency receiver 400 analyzes the magnetic resonance signal. The magnetic resonance signal is transmitted in a wireless mode, due to the fact that shielding is used in the special high-intensity magnetic field structure of the magnetic resonance equipment, multipath effect can occur during signal transmission, receiving performance is affected, in the scheme, the receiving mode of the multiple antennas is used, receiving efficiency can be improved, the use of radio frequency wires for signal transmission is avoided, workflow is simplified, and cost of laying cables is reduced.
It should be noted that, when the radio frequency cable is used, the radio frequency cable can sense a magnetic resonance signal, generate heat, and affect the safety of a magnetic resonance detection object, even the skin of the detection object may be locally burned; the magnetic resonance multi-antenna radio frequency transmission device can effectively solve the problem of cable induction heating through the modes of antenna receiving and wireless transmission, and the space occupied by the original cable can be reused, so that the density of the radio frequency coil unit is improved, and the detection precision is higher.
Further, the number of the plurality of antennas 300 is the number of the antennas, and the number of the antennas in the rf receiving device 200 may be adjusted according to actual needs, and may be generally set to more than two; the radio frequency receiving device 200 can be arranged outside the magnet of the magnetic resonance equipment, and can also be arranged inside the magnet; the radio frequency receiver 400 may reconstruct a magnetic resonance image after analyzing the received magnetic resonance signals.
In one embodiment, as shown in fig. 2, the radio frequency receiving coil 100 includes a coil body 110, an analog-to-digital converter 120, a processor 130 and a wireless transmitter 140 connected in sequence;
the coil body 110 is used for acquiring a magnetic resonance signal emitted by a magnetic resonance examination object, the analog-to-digital converter 120 is used for converting the magnetic resonance signal into a digital signal, the processor 130 is used for controlling the analog-to-digital converter 120 and the wireless transmitter 140, and the wireless transmitter 140 is used for transmitting the digital signal to the radio frequency receiving device 200 in a wireless manner.
In the present embodiment, the radio frequency receiving coil 100 mainly includes four components, the coil body 110 may include a receiving array composed of a plurality of coil units, the magnetic resonance imaging system can directly acquire magnetic resonance signals sent by a magnetic resonance detection object, the acquired magnetic resonance signals belong to analog signals, the analog-to-digital converter 120 can convert the magnetic resonance signals into digital signals, the digital signals are favorable for improving the anti-interference performance of the signals and are also convenient for subsequent signal coding, modulation, compression and other processing, the processor 130 is mainly used for controlling the analog-to-digital converter 120 and the wireless transmitter 140, the acquisition and digitization of the magnetic resonance signals are controlled, the wireless transmitter can transmit the digitized magnetic resonance signals to the radio frequency receiving device 200 in a wireless mode to complete wireless signal transmission, the wireless signal transmission can avoid the generation of heat of the induction signal and does not need to connect cables.
Further, the processor 130 may be an FPGA (Field-Programmable Gate Array), and the whole rf receiving coil 100 is controlled by the FPGA.
In one embodiment, as shown in fig. 3, the radio frequency receive coil 100 further includes an amplifier 150 and a filter 160; the amplifier 150 and the filter 160 are sequentially connected between the coil body 110 and the analog-to-digital converter 120;
the amplifier 150 is used to amplify the magnetic resonance signals and the filter 160 is used to filter the amplified magnetic resonance signals.
In this embodiment, an amplifier 150 and a filter 160 are sequentially connected between the coil body 110 and the analog-to-digital converter 120, the amplifier 150 amplifies the magnetic resonance signal acquired by the coil body 110 to improve the signal-to-noise ratio of the magnetic resonance signal, and the filter 160 filters the amplified magnetic resonance signal to remove out-of-band signals, so as to obtain a more accurate magnetic resonance signal.
Further, in the magnetic resonance apparatus, there may be a plurality of coil bodies 110, each coil body 110 is respectively connected to the amplifier 150, the filter 160 and the analog-to-digital converter 120, the plurality of analog-to-digital converters 120 are all connected to the processor 130, and the processor 130 may process a plurality of magnetic resonance signals in a coordinated manner.
In one embodiment, as shown in fig. 4, the radio frequency receiving device 200 is a radio frequency receiving and transmitting device 210, the radio frequency receiving and transmitting device 210 is configured to transmit control information and synchronization information generated by the magnetic resonance system to the radio frequency receiving coil 100, the processor 130 controls the coil body 110 to start acquiring magnetic resonance signals after receiving the control information through the wireless transmitter 140, the wireless transmitter 140 adds the synchronization information to the magnetic resonance signals, and transmits the added magnetic resonance signals to the radio frequency receiving and transmitting device 210.
In this embodiment, the radio frequency receiving device 200 may be a radio frequency transceiver 210, and has functions of receiving and sending information, before the radio frequency transceiver 210 receives a magnetic resonance signal, it first receives control information and synchronization information generated by a magnetic resonance system, and forwards the control information and synchronization information to the radio frequency receiving coil 100, the wireless transmitter 140 of the radio frequency receiving coil 100 sends the received control information to the processor 130, and the processor 130 controls the coil body 110 to operate according to the control information, and starts to acquire the magnetic resonance signal; after the processor 130 sends the digitized magnetic resonance signal to the wireless transmitter 140, the wireless transmitter 140 adds synchronization information therein, and the synchronization information can help the radio frequency transceiver 210 to ignore repeated signal data packets when receiving the magnetic resonance signal, and can align the signal in time when subsequently processing the magnetic resonance signal, so as to achieve synchronization in the signal acquisition stage.
In one embodiment, the wireless transmitter 140 is also used to add a check code to the acquired magnetic resonance signals.
In this embodiment, the wireless transmitter 140 may further add a check code to the magnetic resonance signal, and the rf receiver 400 may perform data integrity check or cyclic redundancy check on the magnetic resonance signal to determine whether the data is correctly received by the rf transceiver 210, and if a plurality of antennas receive the same magnetic resonance signal at the same time, identify the check code therein, and discard the redundant information therein.
It should be noted that, if the radio frequency receiving coil 100 includes the amplifier 150 and the filter 160, the wireless transmitter 140 adds the check code to the filtered magnetic resonance signal.
In one embodiment, the plurality of antennas 300 includes a first antenna and a second antenna through which the radio frequency receiver 400 performs spatially diverse reception of magnetic resonance signals.
In this embodiment, the plurality of antennas 300 may include two antennas, and the first antenna and the second antenna are spaced apart by a certain distance, and the first antenna and the second antenna may implement spatially diverse reception of magnetic resonance signals; in the case of a signal, if there is only one antenna, the transmission signal reaches one antenna through the first and second paths and other different paths, and when the signals reaching the antenna through at least two paths are out of phase, the signals reach the antenna and cancel each other out, and when the second antenna is present, the signal can reach the second antenna through the third path, and since the two antennas are spaced apart, destructive interference will not likely occur at the two antennas, so that the first antenna and the second antenna in the radio frequency receiving apparatus 200 can achieve accurate reception of the magnetic resonance signal by the code division multiple access technique.
In one embodiment, the radio frequency receiving device 200 is further configured to receive a monitoring signal of the magnetic resonance examination subject.
In this embodiment, the radio frequency receiving device 200 may not only receive the magnetic resonance signal, but also receive a monitoring signal of the magnetic resonance detection object, such as an electrocardiographic motion waveform signal, a respiratory motion waveform signal, a head autonomic motion signal of the detection object, a video monitoring signal, a blood oxygen value signal, and the like, so as to provide the magnetic resonance device system with respiratory or heartbeat triggering when reconstructing the magnetic resonance image, and the radio frequency receiving device 200 receives the monitoring signal for the magnetic resonance detection object, thereby effectively avoiding redundancy of the transmitting and receiving systems of each monitoring device, and avoiding interference between the above data signals.
In one embodiment, the monitoring signal and the magnetic resonance signal use different carrier frequencies when transmitted.
In this embodiment, the monitoring signal and the magnetic resonance signal wirelessly transmitted by the radio frequency receiving coil may use different carrier frequencies, and after the radio frequency receiver 400 receives the monitoring signal and the magnetic resonance signal, the signals may be distinguished according to the different carrier frequencies of the monitoring signal and the magnetic resonance signal, and data required by each of the signals may be obtained.
In one embodiment, the monitoring signal and the magnetic resonance signal are transmitted using time division multiple access, frequency division multiple access, or code division multiple access for distinguishing.
In this embodiment, the monitoring signal and the magnetic resonance signal wirelessly transmitted by the radio frequency receiving coil may use the same carrier frequency, and are distinguished in the radio frequency receiver 400 by time division multiple access, frequency division multiple access, or code division multiple access, and the like, so as to obtain the required data.
In one embodiment, the rf receiver 400 demodulates the monitoring signal and the magnetic resonance signal separately and uses the same baseband processor to resolve the demodulated signals.
In this embodiment, the radio frequency receiver 400 demodulates the received monitoring signal and the magnetic resonance signal separately to prevent the signals from interfering with each other; when the subsequent analysis is carried out, the same baseband processor can be adopted to save the space of the radio frequency receiver.
Further, the radio frequency receiver 400 may amplify the received monitoring signal and the magnetic resonance signal through two low noise amplifiers, and then perform carrier recovery through two mixers, where the two mixers may share a local oscillation signal of a voltage controlled oscillator.
A magnetic resonance system comprises the magnetic resonance multi-antenna radio frequency transmission device.
In this embodiment, the magnetic resonance system includes a magnetic resonance multi-antenna radio frequency transmission apparatus, the magnetic resonance multi-antenna radio frequency transmission apparatus includes a radio frequency receiving coil 100 and a radio frequency receiving apparatus 200, the radio frequency receiving apparatus 200 includes a plurality of antennas 300 and a radio frequency receiver 400, the radio frequency receiving coil 100 in the magnetic resonance device can collect a magnetic resonance signal excited during magnetic resonance detection, the radio frequency receiving coil can send the magnetic resonance signal to the radio frequency receiving apparatus 200 in a wireless manner, the plurality of antennas 300 can forward the magnetic resonance signal to the radio frequency receiver 400, and the radio frequency receiver 400 analyzes the magnetic resonance signal. The magnetic resonance signal is transmitted in a wireless mode, due to the fact that shielding is used in the special high-intensity magnetic field structure of the magnetic resonance equipment, multipath effect can occur during signal transmission, receiving performance is affected, in the scheme, the receiving mode of the multiple antennas is used, receiving efficiency can be improved, the use of radio frequency wires for signal transmission is avoided, workflow is simplified, and cost of laying cables is reduced.
The magnetic resonance system of the embodiment of the invention corresponds to the magnetic resonance multi-antenna radio frequency transmission device, and the technical characteristics and the beneficial effects described in the embodiment of the magnetic resonance multi-antenna radio frequency transmission device are all applicable to the embodiment of the magnetic resonance system.
Specifically, a conventional magnetic resonance system mainly includes several subsystems, i.e., a magnet, a gradient coil, a radio frequency coil, and a receiving link. A uniform static magnetic field is generated by a superconducting magnet, a radio frequency transmitting coil excites hydrogen nuclei to spin to generate magnetic resonance signals, and spatial information encoding is carried out on the signals by using a gradient coil. The magnetic resonance signals are collected by a radio frequency receiving coil, converted into digital signals through a receiving link, and finally reconstructed by a computer to obtain a magnetic resonance image.
The radio frequency receiving coil is an important component of the magnetic resonance system and has a decisive effect on the image quality of the magnetic resonance system. The array receiving coil is widely used at present and has the characteristics of high signal-to-noise ratio, flexible coverage range, convenience in use and the like.
The conventional coil uses a radio frequency wire for transmission of radio frequency signals, and usually a radio frequency cable is used as a main part. The use of conventional radio frequency cables has the following problems:
the use of cables complicates the scanning workflow and requires the plugging of the coils. The cost of laying the cables is exceptionally high, especially in the case of receiving coils integrated in a moving patient bed; the use of the cable can induce magnetic resonance signals, generate heat, affect the safety of a patient (namely a magnetic resonance detection object), and even cause local burn to the skin of the patient; in addition, the use of cables limits the density of the magnetic resonance coil units.
In the scheme of this application, for the magnetic resonance coil of wireless transmission, it can be as required, effectively improves coil unit density to provide higher detection accuracy.
Because the signal of magnetic resonance uses the wireless transmission framework, and because the shielding used in the special structure of the strong magnetic field of magnetic resonance, so the transmission signal can appear the multipath effect, influence the performance of the specialized radio frequency receiver, and for such wireless scene, use the receiving technology of the multiaerial, can raise the receiving efficiency effectively.
The solution of the present application is primarily a magnetic resonance system with multiple antenna reception. The magnetic resonance system comprises a magnet, a gradient coil, a radio frequency transmitting coil, at least one radio frequency receiving coil and a radio frequency transceiving device. The rf receiving coil transmits the digitized magnetic resonance signal to the magnetic resonance system in a wireless transmission manner, and the rf transceiver with multiple antennas is used at the end of the magnetic resonance system to receive the digitized magnetic resonance signal, and the specific architecture is shown in fig. 5.
The radio frequency receiving coil comprises a coil body, an analog-to-digital converter, a wireless transmitter and a processor, and also comprises at least one antenna. The processor is used for controlling the sampling of the analog-to-digital converter, ensuring the signal acquisition of the radio frequency receiving coil and the sequence time sequence synchronization of the magnetic resonance system, and controlling the wireless transmitter to transmit the signals to the radio frequency transceiver. The wireless transmitter is divided into an uplink channel and a downlink channel, the uplink channel transmits control signals and synchronous information to the radio frequency receiving coil through the radio frequency receiving and transmitting device by a radio frequency receiver in the magnetic resonance system, and the downlink channel transmits magnetic resonance signals and related information to the magnetic resonance system through the radio frequency receiving coil by the radio frequency receiving coil.
Further, as shown in fig. 6, the radio frequency receiving coil may be composed of a coil body (1), an amplifier (2), a filter and analog-to-digital converter (3), a processor and a wireless transmitter (4). The amplifier is used for amplifying the magnetic resonance signals collected by the radio frequency receiving coil and improving the signal-to-noise ratio of the magnetic resonance signals, the filter is used for filtering the magnetic resonance signals and eliminating out-of-band signals, the analog-to-digital converter is used for converting the signals into digital signals, and the digital signals are beneficial to improving the anti-interference performance of the signals and are convenient for subsequent processing including but not limited to signal coding, modulation, compression and the like.
The synchronous confirmation process of the wireless transmitter and the magnetic resonance system exists before the up-down coil communication is established. After the coil establishes communication, the wireless transmitter adds synchronous information and check codes in the digitized magnetic resonance signals according to the received synchronous information, the synchronous information can help the radio frequency transceiver to ignore repeated data packets when receiving the signals, and simultaneously, the signals can be aligned in time when the magnetic resonance signals are subsequently processed, so that the synchronization of a signal acquisition stage is realized; the check code may determine the correct receipt of the data signal.
The processor can be an FPGA (field programmable gate array), controls the whole radio frequency receiving coil, processes the receiving and transmitting time sequence of the whole system, and controls the acquisition and digitization of the magnetic resonance signals according to the system requirements.
The radio frequency transceiver at least comprises a first antenna and a second antenna, the first antenna and the second antenna are connected with at least one radio frequency receiver, the radio frequency receiver receives magnetic resonance signals from the radio frequency receiving coil through the first antenna and the second antenna, and magnetic resonance signals from the radio frequency coil are recovered through carrier information of the magnetic resonance signals so as to be used for image reconstruction of a system. The radio frequency transceiver device achieves spatially diverse reception of the magnetic resonance signals by means of at least two antennas. For a signal, if there is only one antenna, the transmission will reach one antenna through the first and second paths, and when the signals arriving at the antenna through the two paths are out of phase, the signals arrive at the antenna and cancel each other out. While when a second antenna is present, the signal can reach the second antenna through a third path, because the antennas are spaced apart, destructive interference will not likely occur at both antennas.
When the digital magnetic resonance signal is transmitted by the radio frequency receiving coil, the digital magnetic resonance signal contains a check code which can be realized by data integrity check or cyclic redundancy check, and the aim is to determine that the data is correctly received by the radio frequency transceiver, and when the two antennas receive the same data together, the back end processes the synchronous information of the identification data and discards the redundant information.
The radio frequency transceiver device may also receive monitoring data for the patient. Such as an electrocardiogram waveform, a respiration waveform, video monitoring, a blood oxygen value and the like, so as to provide the back-end system with respiration or heartbeat triggering when an image is reconstructed. The monitoring data may use the same carrier frequency or a different carrier frequency than the data wirelessly transmitted by the radio frequency receive coil. The radio frequency transceiver receives the monitoring data aiming at the patient, thereby effectively avoiding the redundancy of the transceiver system of each monitoring device and avoiding the mutual interference of the data.
The patient monitoring data and the magnetic resonance data can be distinguished at the receiving end by using multiple access technologies such as time division multiple access, frequency division multiple access or code division multiple access, and completely different carrier frequencies can also be used in the transmission process. Taking a WIFI system as an example, the patient detection data can be transmitted by using 2.4GHz, the magnetic resonance data can be transmitted by using 5.8GHz, the radio frequency transceiver receives signals of the patient detection data and the magnetic resonance data at the same time, and the rear end distinguishes the signals according to different carrier frequencies of the signals and obtains required data. The patient monitoring data and the magnetic resonance data are recovered in the radio frequency transceiver using different carriers, but the same baseband processor is used for processing the signals. The rf receiver now includes at least demodulation for two different carriers and a common baseband processor, as shown in fig. 7.
In addition, the rf transceiver may be disposed outside the magnet of the magnetic resonance system or inside the magnet of the magnetic resonance system, as shown in fig. 8, but the rf transceiver may be disposed inside the magnet of the magnetic resonance system, which may make the system more complicated and may also require consideration of the problem of mutual interference with the components of the existing magnetic resonance system.
Radio frequency receiving coil can include wireless charging coil, and wireless charging coil is used for charging through wireless mode, avoids radio frequency receiving coil to take off frequently and charges. The radio frequency receiving coil can have multiple groups, the wireless charging coil can have one or more groups, and the radio frequency receiving coil can adopt a conductive material or liquid metal.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
Those skilled in the art will appreciate that all or part of the steps in the method for implementing the above embodiments may be implemented by a program instructing the relevant hardware. The program may be stored in a readable storage medium. Which when executed comprises the steps of the method described above. The storage medium includes: ROM/RAM, magnetic disks, optical disks, etc.
The above-mentioned embodiments only express several embodiments of the present invention, 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 inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A magnetic resonance multi-antenna radio frequency transmission device is suitable for a magnetic resonance system and is characterized by comprising a radio frequency receiving coil and a radio frequency receiving device;
the radio frequency receiving coil is arranged in the magnetic resonance equipment and used for receiving a magnetic resonance signal and sending the magnetic resonance signal to the radio frequency receiving device in a wireless mode;
the radio frequency receiving device comprises a plurality of antennas and a radio frequency receiver, and the plurality of antennas respectively receive the magnetic resonance signals and transmit the magnetic resonance signals to the radio frequency receiver;
the radio frequency receiver is used for analyzing the received magnetic resonance signals;
the radio frequency receiving coil comprises a coil body, an analog-to-digital converter, a processor and a wireless transmitter which are sequentially connected;
the coil body is used for collecting magnetic resonance signals sent by a magnetic resonance detection object, the analog-to-digital converter is used for converting the magnetic resonance signals into digital signals, the processor is used for controlling the analog-to-digital converter and the wireless transmitter, and the wireless transmitter is used for transmitting the digital signals to the radio frequency receiving device in a wireless mode;
the radio frequency receiving device is a radio frequency receiving and sending device which is used for sending control information and synchronous information generated by a magnetic resonance system to the radio frequency receiving coil, the processor controls the coil body to start to acquire the magnetic resonance signals after receiving the control information through the wireless transmitter, the wireless transmitter adds the synchronous information and the check code in the magnetic resonance signals and sends the magnetic resonance signals added with the synchronous information to the radio frequency receiving and sending device; the synchronization information is used for ignoring repeated signal data packets when the radio frequency transceiver receives the magnetic resonance signal, and the check code is used for carrying out data integrity check or cyclic redundancy check on the magnetic resonance signal by the radio frequency receiver;
the radio frequency receiving device is also used for receiving monitoring signals of the magnetic resonance detection object, the radio frequency receiver demodulates the monitoring signals and the magnetic resonance signals respectively, and the same baseband processor is used for analyzing the demodulated signals.
2. The magnetic resonance multi-antenna radio frequency transmission device according to claim 1, wherein the radio frequency receiving coil further comprises an amplifier and a filter; the amplifier and the filter are sequentially connected between the coil body and the analog-to-digital converter;
the amplifier is used for amplifying the magnetic resonance signal, and the filter is used for filtering the amplified magnetic resonance signal.
3. The MRU device of claim 1, wherein the RF transceiver is disposed outside or inside the magnet of the MR system.
4. The magnetic resonance multi-antenna radio frequency transmission device according to claim 1, wherein the plurality of antennas include a first antenna and a second antenna, and the radio frequency receiver performs space diversity reception of the magnetic resonance signal through the first antenna and the second antenna.
5. The mrt apparatus of claim 1, wherein the monitoring signal is at least one of a cardiac motion signal, a respiratory motion signal, and a head motion signal.
6. The MRU device of claim 5, wherein the monitor signal and the MRU signal are transmitted using different carrier frequencies.
7. The MRNA radio frequency transmission device according to claim 5, wherein the monitoring signal and the MRNA signal are transmitted using time division multiple access, frequency division multiple access or code division multiple access for distinguishing.
8. A magnetic resonance system comprising a magnetic resonance multi-antenna radio frequency transmission apparatus as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910220107.XA CN109917311B (en) | 2019-03-22 | 2019-03-22 | Magnetic resonance multi-antenna radio frequency transmission device and magnetic resonance system |
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