CN210572694U - Positioning device for magnetic resonance system and magnetic resonance system - Google Patents
Positioning device for magnetic resonance system and magnetic resonance system Download PDFInfo
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- CN210572694U CN210572694U CN201921178556.4U CN201921178556U CN210572694U CN 210572694 U CN210572694 U CN 210572694U CN 201921178556 U CN201921178556 U CN 201921178556U CN 210572694 U CN210572694 U CN 210572694U
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Abstract
The utility model relates to a positioner for magnetic resonance system, include: at least three first wireless sensors; a second wireless sensor for communicating with the first wireless sensors to obtain a distance to each first wireless sensor; a drive unit; and the control unit is used for establishing a space coordinate system, defining the coordinate of each first wireless sensor according to the space coordinate system, communicating with the second wireless sensor, acquiring the distance between the second wireless sensor and each first wireless sensor, calculating the coordinate of the second wireless sensor according to a trilateration method, connecting the control unit with the driving unit, and controlling the driving unit to drive the bed plate bearing the object to be scanned to move so as to enable the radio frequency coil to move to the center of the magnet. The positioning device for the magnetic resonance system does not need to additionally design a wiring structure, does not have the risk of cable damage and has lower cost.
Description
Technical Field
The utility model relates to the technical field of medical equipment, especially, relate to a positioner and magnetic resonance system for magnetic resonance system.
Background
Magnetic resonance imaging is an imaging technology which utilizes the signal generated by the resonance of atomic nuclei in a strong magnetic field to reconstruct an image, utilizes radio frequency pulses to excite the atomic nuclei with non-zero spin in the magnetic field, relaxes the atomic nuclei after the radio frequency pulses are stopped, uses an induction coil to collect the signal in the relaxation process, and reconstructs the signal according to a certain mathematical method to form a mathematical image, so that the positioning of the coil plays a significant role in the imaging quality and directly influences the signal-to-noise ratio of the image.
When a traditional magnetic resonance system is positioned, a coaxial cable or an optical fiber is adopted, an additional wiring structure needs to be designed, the cost is increased, and the cable is also damaged.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a positioning device for a magnetic resonance system and a magnetic resonance system, which are used for solving the problems that the conventional magnetic resonance coil positioning device needs to additionally design a routing structure, so that the cost is increased and the cable is easily damaged.
A positioning apparatus for a magnetic resonance system, comprising:
the wireless sensor system comprises at least three first wireless sensors which are respectively arranged at different preset positions;
the second wireless sensors are arranged on the radio frequency coil of the preset part of the object to be scanned and used for communicating with the first wireless sensors to acquire the distance between each first wireless sensor and the corresponding second wireless sensor;
a drive unit; and
the control unit is used for establishing a space coordinate system and defining the coordinates of each first wireless sensor according to the space coordinate system, the control unit is communicated with the second wireless sensors and obtains the distance between the second wireless sensors and each first wireless sensor, the coordinates of the second wireless sensors are calculated according to a trilateration method, and the control unit is connected with the driving unit and is also used for controlling the driving unit to drive the bed plate bearing the object to be scanned to move so that the radio frequency coil moves to the center of the magnet.
The positioning device for the magnetic resonance system comprises at least three first wireless sensors, a second wireless sensor, a driving unit and a control unit, wherein the coordinates of the at least three first wireless sensors are known, the second wireless sensor is arranged on the radio frequency coil and is communicated with the first wireless sensors to obtain the distance between the second wireless sensor and each first wireless sensor, the control unit can calculate the coordinates of the second wireless sensor, namely the coordinates of the radio frequency coil by trilateration according to the coordinates of the three first wireless sensors and the distance between the second wireless sensor and the three first wireless sensors, and control the driving unit to drive the bed plate bearing the object to be scanned to move so as to enable the radio frequency coil to move to the center of the magnet, and the positioning device for the magnetic resonance system can obtain the coordinates of the radio frequency coil only by wireless distance measurement, the wiring structure does not need to be additionally designed, the risk of cable damage is avoided, and the cost is lower.
In one embodiment, the first wireless sensor is located on the wall of the magnetic resonance system magnet, and the second wireless sensor is internally provided with a wireless charging module.
In one embodiment, three of the first wireless sensors are on the same plane.
In one embodiment, the number of the radio frequency coils on the object to be scanned is multiple, the number of the second wireless sensors is the same as that of the radio frequency coils, the second wireless sensors correspond to the radio frequency coils one by one, and the control unit controls the driving unit to drive the bed plate bearing the object to be scanned to move for multiple times, so that the radio frequency coils move to the center of the magnet in sequence.
In one embodiment, the control unit further comprises a display for displaying the position of the radio frequency coil and controlling the sequence of moving the radio frequency coils to the center of the magnet by the operation of the user on the display interface.
In one embodiment, the second wireless sensor includes identification information of a corresponding radio frequency coil, the first wireless sensor is further configured to identify the identification information, and the control unit is further configured to communicate with the first wireless sensor to obtain the identification information.
In one embodiment, the first wireless sensor is configured to identify a scanning sequence of the corresponding radio frequency coil based on the identification information, and the display is further configured to display the scanning sequence for selection by a user.
In one embodiment, the communication between at least three first wireless sensors and the second wireless sensor is time division multiplexed.
In one embodiment, the magnetic control device further comprises a feedback unit, the control unit is further configured to calculate the coordinate of the second wireless sensor on the radio frequency coil again after the radio frequency coil moves to the center of the magnet, the feedback unit is configured to compare the coordinate of the second wireless sensor with the coordinate of the center of the magnet, and if the coordinate of the second wireless sensor does not match the coordinate of the center of the magnet, the feedback unit controls the driving unit to drive the bed plate to move again through the control unit until the coordinate of the second wireless sensor matches the coordinate of the center of the magnet.
A magnetic resonance system comprising: a magnet forming a bore having a detection space; the movable bed board is used for bearing an imaging object; the radio frequency coil is arranged at a preset part of the imaging object to receive a magnetic resonance signal; and a positioning apparatus for a magnetic resonance system as claimed in any one of the above.
Drawings
Fig. 1 is a block diagram of a positioning apparatus for a magnetic resonance system in an embodiment.
FIG. 2 is a diagram illustrating an exemplary positioning of an RF coil.
FIG. 3 is a diagram illustrating selective scanning by a plurality of RF coils according to an embodiment.
FIG. 4 is a timing diagram illustrating communication between a first wireless sensor and a second wireless sensor in one 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.
In the description of the present application, it is to be understood that the terms "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner" and "outer" etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application. Further, when an element is referred to as being "formed on" another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present.
In an embodiment, as shown in fig. 1, a positioning apparatus for a magnetic resonance system comprises at least three first wireless sensors 110, a second wireless sensor 120, a control unit 130, and a drive unit 140.
The control unit 130 is used to establish a spatial coordinate system and define a coordinate origin. For example, the axial direction of the bore of the magnet of the magnetic resonance system is taken as the x direction, the direction which is perpendicular to the x direction and parallel to the bed plate bearing the object to be scanned is taken as the y direction, the direction which is perpendicular to the xy plane is taken as the z-axis direction, and the center of the magnet is taken as the origin of coordinates.
The number of the first wireless sensors 110 is at least three, and each of the first wireless sensors 110 is respectively disposed at different preset positions. In the present embodiment, referring to fig. 2, the first wireless sensor 110 includes a first wireless sensor S1, a first wireless sensor S2, and a first wireless sensor S3, all disposed on the cylinder wall 150 of the magnetic resonance system magnet. Since the first wireless sensor S1, the first wireless sensor S2 and the first wireless sensor S3 are located at predetermined positions on the wall 150 of the magnet, the control unit 130 can define the coordinates of the first wireless sensor S1, the first wireless sensor S2 and the first wireless sensor S3 according to the established spatial coordinate system and the origin of coordinates.
Optionally, the first wireless sensor 110 and the second wireless sensor 120 are both acoustic wave sensors.
The second wireless sensors 120 are disposed on the rf coil of the preset portion of the object to be scanned, and the number of the second wireless sensors 120 may be one or multiple. For example, when the preset parts are the head, the chest and the legs, the radio frequency coils are required to be respectively arranged at the plurality of preset parts, that is, when there are a plurality of radio frequency coils on the object to be scanned, the number of the second wireless sensors 120 is the same as that of the radio frequency coils, and the radio frequency coils correspond to each other one by one. In other embodiments, multiple wireless sensors 120 may be placed at different locations of the same RF coil. Optionally, the second wireless sensor 120 includes identification information of the corresponding radio frequency coil, e.g., coil type, version, date of shipment, etc. The first wireless sensor 110 is also configured to recognize the identification information, and the control unit 130 is further configured to communicate with the first wireless sensor 110 to obtain the identification information. In the embodiment of the present application, the control unit 130 exchanges information with the first wireless sensor 110 and the second wireless sensor 120 by using a wireless communication method, for example, zigbee, Bluetooth (Bluetooth), wireless broadband (Wi-Fi), Ultra Wideband (UWB), Near Field Communication (NFC), and the like.
Specifically, referring to fig. 2, in one embodiment, the radio frequency coil includes a first coil 201, a second coil 202, and a third coil 203. The multiple radio frequency coils may be located in the same plane or in different planes. The first coil 201 is provided with a second wireless sensor S4, the second coil 202 is provided with a second wireless sensor S5, the third coil 203 is provided with a second wireless sensor S6, and the second wireless sensor S4, the second wireless sensor S5 and the second wireless sensor S6 respectively include identification information of the first coil 201, the second coil 202 and the third coil 203, the identification information can be identified by the first wireless sensor 110 to know which preset position of the object to be scanned the radio frequency coil corresponds to, and related functions of each radio frequency coil, such as a scanning sequence, can be obtained.
The first wireless sensor 110 is disposed on the wall 150 of the magnet, and is powered by the magnetic resonance system. The second wireless sensor 120 is provided with a wireless charging module therein, and a cable is not required to be additionally arranged to connect a power supply. The second wireless sensor 120 is used to communicate with the first wireless sensors 110 to acquire a distance to each of the first wireless sensors 110. Taking the first coil 201 as an example, the second wireless sensor S4 thereon communicates with the first wireless sensor S1, the first wireless sensor S2 and the first wireless sensor S3 respectively to obtain the distance therebetween.
The control unit 130 communicates with the second wireless sensors 120 and acquires the distance between the second wireless sensors 120 and each of the first wireless sensors 110, and calculates the coordinates of the second wireless sensors 120 according to trilateration. Still taking the first coil 201 as an example, the control unit 130 communicates with the second wireless sensor S4 and obtains the distances between the second wireless sensor S4 and the first wireless sensor S1, the first wireless sensor S2 and the first wireless sensor S3, respectively, while the coordinates of the first wireless sensor S1, the first wireless sensor S2 and the first wireless sensor S3 are known, and the coordinates of the second wireless sensor S4, i.e., the coordinates of the first coil 201, are easily obtained by trilateration. Similarly, the control unit 130 may calculate the coordinates of the second coil 202 and the third coil 203. The detailed calculation process is not described herein. Optionally, each first wireless sensor 110 is located on the same plane to reduce the amount of computation.
The control unit 130 is connected to the driving unit 140, and is further configured to control the driving unit 140 to drive the table carrying the object to be scanned to move so that the radio frequency coil moves to the center of the magnet. As described above, the control unit 130 calculates the coordinates of the first coil 201, and the magnet center is the origin of coordinates, and the control unit 130 controls the driving unit 140 to drive the table to move so that the first coil 201 moves to the origin of coordinates. In the present embodiment, the control unit 130 controls the driving unit 140 to drive the movement of the couch plate a plurality of times so that the first coil 201, the second coil 202, and the third coil 203 sequentially move to the center of the magnet in a designated order.
The above-mentioned locating device for a magnetic resonance system comprises at least three first wireless sensors 110, a second wireless sensor 120, a driving unit 130 and a control unit 140, wherein the coordinates of the at least three first wireless sensors 110 are known, the second wireless sensor 120 is arranged on a radio frequency coil, the second wireless sensor 120 communicates with the first wireless sensors 110 to obtain the distance between the second wireless sensor 120 and each first wireless sensor 110, the control unit 130 can calculate the coordinates of the second wireless sensor 120, i.e. the coordinates of a radio frequency coil, by trilateration according to the coordinates of the three first wireless sensors 110 and the distance between the second wireless sensor 120 and the three first wireless sensors 110, and control the driving unit 130 to drive a bed plate carrying the object to be scanned to move the radio frequency coil to the center of the magnet, this a positioner for magnetic resonance system only need can obtain the coordinate of radio frequency coil through wireless range finding, need not extra design and walks line structure, does not have the risk of cable damage and the cost is lower.
In one embodiment, the control unit 130 further comprises a display (not shown). The display is used for displaying the position of the radio frequency coil, and the sequence of the radio frequency coils moving to the center of the magnet is controlled through the operation of a user on the display interface. For example, referring to FIG. 3, the control unit 130 includes a computer 132 and a computer display 134. The second wireless sensor S4, the second wireless sensor S5 and the second wireless sensor S6 form a wireless sensor group 300, and are connected to the computer 132, the computer 132 calculates the coordinates of the first coil 201, the second coil 202 and the third coil 203 to be displayed by the computer display 134, and the user can select to move a certain rf coil to the center of the magnet at the interface, i.e. control the sequence of moving the first coil 201, the second coil 202 and the third coil 203 to the center of the magnet. In this embodiment, the computer display 134 is further used for displaying the scan sequence of the rf coil and other related functions for the user to select, thereby saving the user's screening time.
In an embodiment, the positioning apparatus for a magnetic resonance system further comprises a feedback unit (not shown). The control unit 130 is also arranged to recalculate the coordinates of the second wireless sensor 120 on the radio frequency coil after the coil has been moved to the centre of the magnet. The feedback unit is used for comparing the coordinates of the second wireless sensor 120 with the coordinates of the center of the magnet, and if the coordinates of the second wireless sensor 120 do not match with the coordinates of the center of the magnet, the feedback unit controls the driving unit 140 to drive the bed board to move again through the control unit 130 until the coordinates of the second wireless sensor 120 match with the coordinates of the center of the magnet. The position of the radio frequency coil is more accurate through the feedback unit, and the magnetic resonance image with more accurate preset part can be obtained.
In one embodiment, the communication between the at least three first wireless sensors 110 and the second wireless sensor 120 is in a Time Division Multiplex (TDMA) manner. When the first wireless sensor S1, the first wireless sensor S2 and the first wireless sensor S3 communicate with the second wireless sensor S4, the second wireless sensor S5 and the second wireless sensor S6, interference occurs between the first wireless sensors S1-S3 at different positions. Similarly, interference may occur between the second wireless sensors S4-S6 located at different positions of the RF coil. When the first wireless sensor S1 communicates with any one of the second wireless sensors S4-S6, the first wireless sensors S2, S3 also interfere with S1. In this embodiment, the communication between the first wireless sensor and the second wireless sensor 120 can suppress these interferences by using a time division multiplexing method.
Specifically, referring to fig. 4, in the figure, a TX arrow (from top to bottom in the figure) is a trigger signal, and an RX arrow (from bottom to top in the figure) is a feedback signal. After the identification and positioning of the radio frequency coil are started, the first wireless sensors S1-S3 on the wall of the cylinder send out trigger signals according to a preset time sequence T1-T9, the second wireless sensors S4-S6 send out feedback signals at each time sequence point respectively, the first wireless sensors S1-S3 only select one of the second wireless sensors S4, S5 and S6 to communicate at each time sequence point according to a certain algorithm, the corresponding radio frequency coil is identified, the distance between the corresponding radio frequency coil is calculated and stored, and the coordinates of the second wireless sensors S4-S6 are calculated by the computer 132. It should be noted that, the present embodiment includes, but is not limited to, the timing of the communication between the first wireless sensors S1-S3 and the second wireless sensors S4-S6 in fig. 4.
The application also provides a magnetic resonance system, which comprises a magnet, a movable bed plate, a radio frequency coil and the positioning device for the magnetic resonance system in any embodiment. Wherein the magnet forms a bore with a detection space, and a scanning region is inside the bore. A movable couch top is used to carry the imaging subject, the couch top being movable. The radio frequency coil is arranged at a preset part of the imaging object to receive a magnetic resonance signal. The control unit in the positioning device for the magnetic resonance system controls the movement of the movable bed plate so as to move the preset part of the imaging object and the radio frequency coil of the part to the center of the magnet.
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.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A positioning apparatus for a magnetic resonance system, comprising:
the wireless sensor system comprises at least three first wireless sensors which are respectively arranged at different preset positions;
the second wireless sensors are arranged on the radio frequency coil of the preset part of the object to be scanned and used for communicating with the first wireless sensors to acquire the distance between each first wireless sensor and the corresponding second wireless sensor;
a drive unit; and
the control unit is used for establishing a space coordinate system and defining the coordinates of each first wireless sensor according to the space coordinate system, the control unit is communicated with the second wireless sensors and obtains the distance between the second wireless sensors and each first wireless sensor, the coordinates of the second wireless sensors are calculated according to a trilateration method, and the control unit is connected with the driving unit and is also used for controlling the driving unit to drive the bed plate bearing the object to be scanned to move so that the radio frequency coil moves to the center of the magnet.
2. The positioning device as set forth in claim 1, wherein said first wireless sensor is located on a wall of a cylinder of a magnetic resonance system magnet, and said second wireless sensor has a wireless charging module built therein.
3. The positioning device of claim 2, wherein three of said first wireless sensors are on the same plane.
4. The positioning apparatus according to claim 1, wherein there are a plurality of rf coils on the object to be scanned, the number of the second wireless sensors is the same as the number of the rf coils, and the number of the second wireless sensors corresponds to the number of the rf coils, and the control unit controls the driving unit to drive the table carrying the object to be scanned to move for a plurality of times, so that the plurality of rf coils move to the center of the magnet in sequence.
5. The positioning device as set forth in claim 4, wherein the control unit further comprises a display for displaying the positions of the radio frequency coils and controlling the sequence of the plurality of radio frequency coils moving to the center of the magnet by a user's operation on a display interface.
6. The positioning device of claim 5, wherein the second wireless sensor comprises identification information of a corresponding radio frequency coil, the first wireless sensor is further configured to identify the identification information, and the control unit is further configured to communicate with the first wireless sensor to obtain the identification information.
7. The positioning device as set forth in claim 6 wherein said first wireless sensor is configured to identify a scanning sequence of a corresponding radio frequency coil based on said identification information, said display being further configured to display said scanning sequence for selection by a user.
8. The positioning device of claim 1, wherein the communication between the at least three first wireless sensors and the second wireless sensor is time division multiplexed.
9. The positioning device as claimed in claim 1, further comprising a feedback unit, wherein the control unit is further configured to recalculate the coordinates of the second wireless sensor on the rf coil after the rf coil moves to the center of the magnet, the feedback unit is configured to compare the coordinates of the second wireless sensor with the coordinates of the center of the magnet, and if the coordinates of the second wireless sensor do not match with the coordinates of the center of the magnet, the feedback unit controls the driving unit to drive the table to move again through the control unit until the coordinates of the second wireless sensor match with the coordinates of the center of the magnet.
10. A magnetic resonance system, comprising: a magnet forming a bore having a detection space; the movable bed board is used for bearing an imaging object; the radio frequency coil is arranged at a preset part of the imaging object to receive a magnetic resonance signal; and a positioning device for a magnetic resonance system as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921178556.4U CN210572694U (en) | 2019-07-25 | 2019-07-25 | Positioning device for magnetic resonance system and magnetic resonance system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921178556.4U CN210572694U (en) | 2019-07-25 | 2019-07-25 | Positioning device for magnetic resonance system and magnetic resonance system |
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| Publication Number | Publication Date |
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| CN210572694U true CN210572694U (en) | 2020-05-19 |
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| CN201921178556.4U Active CN210572694U (en) | 2019-07-25 | 2019-07-25 | Positioning device for magnetic resonance system and magnetic resonance system |
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Address after: 201807 Shanghai City, north of the city of Jiading District Road No. 2258 Patentee after: Shanghai Lianying Medical Technology Co., Ltd Address before: 201807 Shanghai City, north of the city of Jiading District Road No. 2258 Patentee before: SHANGHAI UNITED IMAGING HEALTHCARE Co.,Ltd. |