Ultrasonic signal line magnetic resonance waveguide tube joint and anti-interference method thereof

Abstract

The invention is applicable to the technical field of magnetic resonance compatibility, and provides an ultrasonic signal line passing magnetic resonance waveguide tube joint and an anti-interference method thereof. According to the magnetic resonance waveguide tube connector for the ultrasonic signal line to pass through the magnetic resonance waveguide tube, the shielding layer (ground wire) of the ultrasonic electric signal line is tightly connected with the ground of the waveguide tube, so that an interference signal attached to the shielding layer (outer ground) of the ultrasonic electric signal line is introduced into the ground of the waveguide tube, and the interference signal cannot enter a magnetic resonance scanning room; and the interference shielding effect is achieved. And meanwhile, the waveguide tube connected with the ultrasonic electric signal line is sealed, so that the invasion of external interference can be shielded. The adopted anti-interference method has the same technical effect inevitably.

Description

Technical Field

[0001] The present application belongs to the field of magnetic resonance compatibility technology, and in particular relates to an ultrasonic signal line passing through a magnetic resonance waveguide joint and an anti-interference method thereof. Background Art

[0002] In the application environment of MRI-guided ultrasound treatment of brain diseases, the ultrasonic electrical signal line needs to be transmitted from the MRI operation room to the MRI scanning room, reach the MRI scanning bed, and enter the cavity of the MRI body coil along with the MRI scanning bed. Since the MRI scanning room is a low-interference, closed room that requires good shielding, there are only two ways for the ultrasonic electrical signal line to enter the MRI scanning room. One method is to connect the ultrasonic electrical signal line through a specially reserved filter plate on the wall through an adapter; the other method is to connect the ultrasonic electrical signal line directly through the waveguide on the shielding wall.

[0003] The first method requires construction on the original shielding wall of the MRI scanning room to install the filter board, which is difficult to operate and expensive; it usually needs to be reserved in advance when designing and building the MRI scanning room. Figure 1 As shown, although the connection method is simple, convenient and low-cost, since the waveguide is originally a channel for non-electrical transmission lines such as water pipes, air pipes, and optical fibers, when the ultrasonic electrical signal passes through the waveguide, it will cause the space interference signal outside the room or the instrument interference signal to be transmitted to the magnetic resonance scanning room through the electrical signal transmission line, causing interference to the magnetic resonance imaging, and even the imaging scan cannot be completed. When it is necessary to temporarily add ultrasonic equipment or make an emergency ultrasonic electrical signal line connection in the magnetic resonance scanning room, the interference signal introduced will affect the imaging of the magnetic resonance scanning equipment. The existing technology has shortcomings. Summary of the invention

[0004] The purpose of the present application is to provide an ultrasonic signal line through a magnetic resonance waveguide joint and an anti-interference method thereof, aiming to solve the technical problem of interference and intrusion into a magnetic resonance scanning room by stably connecting the shielding layer of the ultrasonic signal line to the ground wire of the waveguide and closing the spatial gap of the waveguide.

[0005] On the one hand, the present application provides an ultrasonic signal line through magnetic resonance waveguide tube joint, including a coaxial cable connector and a fixing plate; the coaxial cable connector is composed of a metal tube core, an insulating layer and a metal shielding shell coaxially nested in sequence; the two ends of the metal tube core are respectively inserted into the metal core wires of two ultrasonic signal lines to be connected; the two ends of the metal shielding shell are respectively threadedly connected to the connector shells of the two ultrasonic signal lines to be connected, so that the shielding layers of the two connected ultrasonic signal lines are conductive;

[0006] The area of ​​the fixing plate is larger than the cross-sectional area of ​​the waveguide tube so as to close one end of the waveguide tube; the coaxial cable connector passes through the fixing plate; the surface of the fixing plate is covered with a soft metal layer, the soft metal layer is electrically connected to the metal shielding shell, the soft metal layer seals the gap between the fixing plate and the waveguide tube port, and is grounded through the waveguide tube.

[0007] On the other hand, the present application also provides an anti-interference method applied to the above-mentioned ultrasonic signal line passing through the magnetic resonance waveguide joint, the method comprising the following steps:

[0008] s1. Cut the ultrasonic signal line connected to the magnetic resonance scanning room through the waveguide into two sections, and redo the joints on the two sections to expose the shielding layer of the ultrasonic signal line;

[0009] s2. The fixing plate is sleeved on the coaxial cable connector, and the two sections of the ultrasonic signal line in step s1 are connected through the coaxial cable connector;

[0010] s3. A soft metal layer is covered on the surface of the fixing plate, and the coaxial cable connector and the fixing plate are fixed by the soft metal layer;

[0011] s4. Use the fixing plate to close one side port of the waveguide tube, and use the soft metal layer to seal the gap between the two, so that the ground wire of the waveguide tube is stably connected to the shielding layer of the ultrasonic signal line.

[0012] The present application utilizes the shielding layer (ground wire) of the ultrasonic electric signal line to be tightly connected to the ground of the waveguide, so that the interference signal attached to the shielding layer (outer ground) of the ultrasonic electric signal line is guided into the ground of the waveguide, so that the interference signal cannot enter the magnetic resonance scanning room, thereby achieving the effect of shielding interference. At the same time, sealing the waveguide connected to the ultrasonic electric signal line also helps to shield the intrusion of external interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure in which an ultrasonic signal line is connected through a waveguide of a magnetic resonance scanning room in the prior art;

[0014] Figure 2 This is a schematic diagram of the structure of an ultrasonic signal line passing through a magnetic resonance waveguide joint provided in Example 1 of the present application;

[0015] Figure 3 This is a comparison diagram of the three-state imaging effects when the connector and anti-interference method of the present application are used and when the anti-interference method is not used;

[0016] Figure 4 This is a flow chart of the anti-interference method provided in Example 2 of the present application. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0018] The specific implementation of this application is described in detail below in conjunction with specific embodiments:

[0019] Embodiment 1:

[0020] Figure 2 The structure of the ultrasonic signal line through the magnetic resonance waveguide joint provided in the first embodiment of the present application is shown. For the convenience of description, only the part related to the embodiment of the present application is shown, which is described in detail as follows:

[0021] On the one hand, the present application provides an ultrasonic signal line through magnetic resonance waveguide joint, including a coaxial cable connector and a fixing plate; the coaxial cable connector is composed of a metal tube core, an insulating layer and a metal shielding shell coaxially nested in sequence; the two ends of the metal tube core are respectively inserted into the metal core wires of the two ultrasonic signal lines that need to be connected; the two ends of the metal shielding shell are respectively threadedly connected to the connector shells of the two ultrasonic signal lines that need to be connected, so that the shielding layers of the two connected ultrasonic signal lines are connected; it is convenient to conduct the interference at both ends of the coaxial cable connector to the ground wire of the waveguide. In this way, the interference is filtered out and the magnetic resonance imaging is not affected.

[0022] The area of ​​the fixing plate is larger than the cross-sectional area of ​​the waveguide tube so as to close one end of the waveguide tube; the coaxial cable connector passes through the fixing plate; the surface of the fixing plate is covered with a soft metal layer (preferably sealed in the form of wrapping, which can stably connect the two side surfaces of the fixing plate and improve the anti-interference effect), the soft metal layer is electrically connected to the metal shielding shell, the soft metal layer seals the gap between the fixing plate and the waveguide tube port, and is grounded through the waveguide tube.

[0023] Furthermore, both ends of the metal tube core are trumpet-shaped to enhance the contact with the inserted metal core wire, and the trumpet-shaped convergent shape can also be introduced into the end of the metal core wire to avoid position deviation when the metal core is inserted.

[0024] Furthermore, the inner diameter of the metal tube core matches the outer diameter of the metal core to avoid a gap between the two after insertion, so as to ensure smooth signal transmission and avoid interference caused by poor contact.

[0025] Furthermore, the soft metal layer is one of tin foil, copper foil and gold foil. The present application prefers copper foil as the soft metal layer. This material can take into account both conductivity and cost, and its soft material is also easy to wrap and cover the surface of the device.

[0026] Further, the fixing plate is one of a cardboard, a foam plate and a metal plate. The present application preferably uses a foam plate as the fixing plate, because its lighter material will not burden the sealing of the soft metal layer, thereby improving the durability of the joint.

[0027] Furthermore, the soft metal layer adopts a multi-layer stacking structure; the soft metal layer that wraps and covers the coaxial cable connector and the fixing plate, and the soft metal layer that wraps and covers the gap between the fixing plate and the waveguide are the same layer or different layers.

[0028] As attached Figure 2 As shown, the coaxial cable connector passes through the hole of the fixing plate, and the two sides are connected to the ultrasonic signal transmission line. One end of the ultrasonic signal line passes through the waveguide to the magnetic resonance operation room and is connected to the control machine, and the other end is connected to the ultrasonic equipment in the magnetic resonance scanning room. The fixing plate is close to the waveguide and fixed to the waveguide with copper foil to achieve the sealing of the gap between the two and the fixation of the coaxial cable connector to the fixing plate. This allows the ultrasonic signal line to pass through the waveguide without interference, avoiding the influence of external interference on the imaging of the magnetic resonance scanning equipment.

[0029] Embodiment 2:

[0030] On the other hand, if the Figure 4 As shown, the present application also provides an anti-interference method applied to the above-mentioned ultrasonic signal line passing through the magnetic resonance waveguide joint, and the method comprises the following steps:

[0031] s1. Cut the ultrasonic signal line connected to the magnetic resonance scanning room through the waveguide into two sections, and redo the joints on the two sections to expose the shielding layer of the ultrasonic signal line;

[0032] s2. The fixing plate is sleeved on the coaxial cable connector, and the two sections of the ultrasonic signal line in step s1 are connected through the coaxial cable connector;

[0033] s3. A soft metal layer is covered on the surface of the fixing plate, and the coaxial cable connector and the fixing plate are fixed by the soft metal layer;

[0034] s4. Use the fixing plate to close one side port of the waveguide tube, and use the soft metal layer to seal the gap between the two, so that the ground wire of the waveguide tube is stably connected to the shielding layer of the ultrasonic signal line.

[0035] As attached Figure 3As shown in the three-state imaging comparison diagram, the upper left diagram is the imaging diagram of the state without ultrasonic electric signal line, the upper right diagram is the imaging diagram of the state where the ultrasonic electric signal line directly passes through the waveguide tube, and the lower diagram is the imaging diagram after using this scheme. It can be seen that the imaging after using this scheme is greatly improved compared with the imaging of the ultrasonic electric signal line directly passing through the waveguide tube, and can meet the imaging requirements.

[0036] In summary, the ultrasonic signal line passing through the magnetic resonance waveguide tube connector and its anti-interference method proposed in this application are based on the lead-out of the ultrasonic electrical signal line shielding layer, so that the ground wire of the waveguide tube can be connected to the shielding layer to achieve interference shielding of the emergency connection.

[0037] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An ultrasonic signal line through a magnetic resonance waveguide joint, comprising a coaxial cable connector and a fixing plate; characterized in that: The coaxial cable connector is composed of a metal tube core, an insulating layer and a metal shielding shell coaxially nested in sequence; the two ends of the metal tube core are respectively inserted into the metal core wires of the two ultrasonic signal lines to be connected; the two ends of the metal shielding shell are respectively threadedly connected to the connector shells of the two ultrasonic signal lines to be connected, so that the shielding layers of the two connected ultrasonic signal lines are conductive; The area of ​​the fixing plate is larger than the cross-sectional area of ​​the waveguide tube so as to close one end of the waveguide tube; the coaxial cable connector passes through the fixing plate; the surface of the fixing plate is covered with a soft metal layer, the soft metal layer is electrically connected to the metal shielding shell, the soft metal layer seals the gap between the fixing plate and the waveguide tube port, and is grounded through the waveguide tube.

2. The ultrasonic signal line through magnetic resonance waveguide joint according to claim 1, characterized in that: Both ends of the metal tube core are flared to enhance the contact with the inserted metal core wire.

3. The ultrasonic signal line through magnetic resonance waveguide joint according to claim 2, characterized in that: The inner diameter of the metal tube core matches the outer diameter of the metal core.

4. The ultrasonic signal line through magnetic resonance waveguide joint according to claim 1, characterized in that: The soft metal layer is one of tin foil, copper foil and gold foil.

5. The ultrasonic signal line through magnetic resonance waveguide joint according to claim 1, characterized in that: The fixing plate is one of a cardboard, a foam board and a metal plate.

6. The ultrasonic signal line through magnetic resonance waveguide joint according to claim 1, characterized in that: The soft metal layer adopts a multi-layer superposition structure; the soft metal layer that wraps and covers the coaxial cable connector and the fixing plate, and the soft metal layer that wraps and covers the gap between the fixing plate and the waveguide are the same layer or different layers.

7. An anti-interference method for an ultrasonic signal line passing through a magnetic resonance waveguide joint as claimed in any one of claims 1 to 6, characterized in that: The method comprises the following steps: s1. Cut the ultrasonic signal line connected to the magnetic resonance scanning room through the waveguide into two sections, and redo the joints on the two cut surfaces to expose the shielding layer of the ultrasonic signal line; s2. The fixing plate is sleeved on the coaxial cable connector, and the two sections of the ultrasonic signal line in step s1 are connected through the coaxial cable connector; s3. A soft metal layer is covered on the surface of the fixing plate, and the coaxial cable connector and the fixing plate are fixed by the soft metal layer; s4. Use the fixing plate to close one side port of the waveguide tube, and use the soft metal layer to seal the gap between the two, so that the ground wire of the waveguide tube is stably connected to the shielding layer of the ultrasonic signal line.

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