A wireless radio frequency coil for magnetic resonance imaging of the knuckles and an application device thereof

Abstract

The utility model discloses a wireless radio frequency coil for finger joint magnetic resonance imaging, and the coil contains conductor material, and contains at least a group by one inductance L1 and two reverse parallel PIN diode V1 series combination A, and one decoupling capacitor C1 is connected in parallel to series combination A, and then one across capacitor C3 is connected in series through the conductor material, and constitutes a first rectangle passive coil, and contains at least a group by one inductance L2 and two reverse parallel PIN diode V2 series combination B, and one decoupling capacitor C2 is connected in parallel to series combination B, and then one across capacitor C4 is connected in series through the conductor material, and constitutes a second rectangle passive coil, and first rectangle passive coil and second rectangle passive coil are connected through a conductor and a capacitor C5 respectively on both sides of across capacitor C3 and C4. For the high resolution imaging of small parts such as finger, compared with the signal-to-noise ratio (SNR) of traditional coil, the clear image has remarkable promotion.

Description

Technical Field

[0001] This utility model relates to the field of magnetic resonance imaging technology. Specifically, this application relates to a two-piece wireless radio frequency coil for finger magnetic resonance imaging, and more specifically, a two-piece single-finger wireless coil structure covering the metacarpal bone and finger, suitable for high-resolution finger MRI scanning. Background Technology

[0002] Existing magnetic resonance imaging (MRI) systems use wired coil devices for imaging. By utilizing multiple coils to receive and process signals from the subject, imaging time is reduced. The g-factor is a value determined by the coil positions and the SENSE (sensitivity coding) algorithm. Moreover, in SENSE technology, it is known that the SNR (signal-to-noise ratio) is inversely proportional to the g-factor (geometric factor). SWNSE technology is a parallel MRI technique that reduces imaging time by sampling the phase coding step size instead of receiving signals in parallel through multiple coils. The g-factor is a value determined by the coil positions and the SENSE algorithm.

[0003] Currently, magnetic resonance imaging systems are typically equipped with standard receiving coils (such as body coils, head coils, etc.), but for high-resolution imaging of small parts such as fingers, traditional coils have a low signal-to-noise ratio (SNR), making it difficult to obtain clear images. Utility Model Content

[0004] This invention proposes a wireless radio frequency coil for magnetic resonance imaging of finger joints and its application device. The coil cooperates with the body coil of the magnetic resonance system through near-field coupling to improve the signal-to-noise ratio of the finger area imaging, ensuring patient comfort and system safety.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A wireless radio frequency coil for magnetic resonance imaging of finger joints, the coil comprising: The coil substrate, which is a planar material made of a flexible and magnetically compatible electrical insulating material, is used to attach and fix the coil. A coil contains conductor material, and It includes at least one series combination of an inductor L and two anti-parallel PIN diodes V, followed by a decoupling capacitor C connected in parallel, and then a bridging capacitor C connected in series through a conductor material. ， This forms a rectangular passive coil.

[0006] More preferably, a wireless radio frequency coil for knuckle magnetic resonance imaging, the coil comprising a conductor material, and It includes at least one series combination A consisting of an inductor L1 and two anti-parallel PIN diodes V1, with a decoupling capacitor C1 connected in parallel to combination A, and then a bridging capacitor C3 connected in series through a conductor material, forming a first rectangular passive coil; and It includes at least one series combination B consisting of an inductor L2 and two anti-parallel PIN diodes V2, with a decoupling capacitor C2 connected in parallel to the series combination B and a bridging capacitor C4 connected in series through a conductor material to form a second rectangular passive coil. The first rectangular passive coil and the second rectangular passive coil are connected on both sides of the bridging capacitors C3 and C4 through a conductor and a capacitor C5, respectively.

[0007] Preferably, the coil is made of a flexible PCB board and encapsulated with MRI-compatible foam material.

[0008] A wireless radio frequency coil for finger joint magnetic resonance imaging further includes a sleeve for wearing on a finger. A first rectangular passive coil and a second rectangular passive coil of the wireless radio frequency coil are sleeved facing each other on the surface of the sleeve, extending to cover the back of the finger or the palm. The rectangular passive coils are covered and fixed to both sides of the finger by adhesive tape. The attachment points of the adhesive tape are located on the surface of the sleeve and on the outermost inner surface of the coil.

[0009] A wireless radio frequency coil application device for knuckle magnetic resonance imaging includes: a main magnetic field generator for generating a main magnetic field passing through the imaging area; a radio frequency exciter for applying radio frequency pulses of a certain frequency to the object to be imaged; and a signal receiver and an imaging display device. The imaging area is covered by the wireless radio frequency coil. The radio frequency pulse magnetic field signal emitted by the radio frequency exciter is converted into a converted signal by the coil decoupling circuit, and the converted signal is then received by the signal receiver for display and imaging.

[0010] As can be seen from the above technical solution, this utility model has the following advantages: For high-resolution imaging of small parts such as fingers, the signal-to-noise ratio (SNR) of traditional coils is significantly improved, resulting in clearer images. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the circuit layout of Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the structure of Embodiment 1 of this utility model; Figure 3 This is a schematic diagram of the circuit layout of Embodiment 2 of this utility model; Figure 4 This is a schematic diagram of the structure of Embodiment 2 of this utility model; Figure 5 This is a schematic diagram illustrating the application of this utility model. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. Example

[0013] like Figure 1 The diagram shows a wireless radio frequency coil for knuckle magnetic resonance imaging, the coil comprising: The coil substrate, which is a planar material made of a flexible and magnetically compatible electrical insulating material, is used to attach and fix the coil. A coil contains conductor material, and It includes at least one series combination of an inductor L and two anti-parallel PIN diodes V, followed by a decoupling capacitor C connected in parallel, and then a bridging capacitor C connected in series through a conductor material. ， This forms a rectangular passive coil.

[0014] The coil is made using a flexible PCB board and is covered with MRI-compatible foam material.

[0015] like Figure 2 The wireless radio frequency coil for finger joint magnetic resonance imaging shown also includes a sleeve 1 for wearing on the finger. The first rectangular passive coil 2 of the wireless radio frequency coil is sleeved on the surface of the sleeve and extends to cover the back of the finger or the palm. The rectangular passive coil is covered and fixed to both sides of the finger by adhesive tape 4. Example

[0016] like Figure 3 The diagram illustrates a wireless radio frequency coil for knuckle magnetic resonance imaging. The coil comprises a conductor material, and It includes a series combination A consisting of an inductor L1 and two anti-parallel PIN diodes V1, with a decoupling capacitor C1 connected in parallel to combination A, and then a bridging capacitor C3 connected in series through a conductor material, forming a first rectangular passive coil 2; and It includes a series combination B consisting of an inductor L2 and two anti-parallel PIN diodes V2, with a decoupling capacitor C2 connected in parallel to the series combination B and a bridging capacitor C4 connected in series through a conductor material, forming a second rectangular passive coil 3. The first rectangular passive coil 2 and the second rectangular passive coil 3 are connected on both sides of the bridging capacitors C3 and C4 through a conductor and a capacitor C5, respectively.

[0017] Preferably, the coil is made of a flexible PCB board and encapsulated with MRI-compatible foam material.

[0018] like Figure 4 The diagram illustrates a wireless radio frequency coil for finger joint magnetic resonance imaging, further comprising a sleeve 1 for wearing on a finger. A first rectangular passive coil 2 and a second rectangular passive coil 3 of the wireless radio frequency coil are fitted onto the surface of the sleeve, extending to cover the back of the finger and the palm. The rectangular passive coils are secured to both sides of the finger by adhesive tape. The attachment points of the adhesive tape 4 are located on the surface of the sleeve and on one side of the outermost inner surface of the coil.

[0019] Coil applications:

[0020] like Figure 5 The application scenario shown for the hand also includes: a main magnetic field generator for generating a main magnetic field that passes through the imaging area; a radio frequency exciter for applying radio frequency pulses of a certain frequency to the subject to be imaged; and a signal receiver and an imaging display device. The area to be imaged covers the wireless radio frequency coil of the hand. The radio frequency pulse magnetic field signal emitted by the radio frequency exciter is converted into a converted signal by the coil decoupling circuit. The converted signal is then received by the signal receiver for display and imaging.

[0021] In this embodiment, the coil is made using a flexible PCB board and encased in MRI-compatible foam material. The coil is tuned to a frequency of 63.67 MHz via a high-Q nonmagnetic capacitor, and a passive decoupling circuit consisting of cross diodes and inductors is used to achieve shielding during the transmission phase and resonance during the reception phase.

[0022] The upper and lower coils are attached and fixed to the back of the patient's fingers and palm with medical-grade hook and loop fasteners, adapting to different patient hand shapes, improving wearing comfort and ensuring imaging effect.

[0023] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A wireless radio frequency coil for knuckle magnetic resonance imaging, the coil comprising: The coil substrate, which is a planar material made of a flexible and magnetically compatible electrical insulating material, is used to attach and fix the coil. The coil comprises a conductor material, characterized in that, It includes at least one series combination of an inductor L and two anti-parallel PIN diodes V, followed by a decoupling capacitor C connected in parallel, and then a bridging capacitor C connected in series through a conductor material. ， This forms a rectangular passive coil.

2. The wireless radio frequency coil for knuckle magnetic resonance imaging according to claim 1, characterized in that, A coil contains conductor material, and It includes at least one series combination A consisting of an inductor L1 and two anti-parallel PIN diodes V1, with a decoupling capacitor C1 connected in parallel to combination A, and then a bridging capacitor C3 connected in series through a conductor material, forming a first rectangular passive coil; and It includes at least one series combination B consisting of an inductor L2 and two anti-parallel PIN diodes V2, with a decoupling capacitor C2 connected in parallel to the series combination B and a bridging capacitor C4 connected in series through a conductor material to form a second rectangular passive coil. The first rectangular passive coil and the second rectangular passive coil are connected on both sides of the bridging capacitors C3 and C4 through a conductor and a capacitor C5, respectively.

3. A wireless radio frequency coil for knuckle magnetic resonance imaging according to claim 1 or 2, characterized in that, The coil is made using a flexible PCB board and is covered with MRI-compatible foam material.

4. A wireless radio frequency coil for knuckle magnetic resonance imaging according to claim 1 or 2, characterized in that, It also includes a sleeve for wearing on the finger, with the first and second rectangular passive coils of the wireless radio frequency coils facing each other on the surface of the sleeve, extending to cover the back of the finger or the palm. The rectangular passive coils are covered and fixed to both sides of the finger by adhesive tape.

5. A wireless radio frequency coil for knuckle magnetic resonance imaging according to claim 4, characterized in that, The adhesive tape attachment point is located on the sleeve surface and on the outermost inner surface of the coil.

6. A wireless radio frequency coil application device for knuckle magnetic resonance imaging as described in claim 4, comprising: The main magnetic field generator is used to generate the main magnetic field that passes through the imaging region; Radio frequency exciter, used to apply radio frequency pulses of a certain frequency to the object to be imaged; And a signal receiver and an imaging display device, characterized in that: The area to be imaged is covered by a wireless radio frequency coil. The radio frequency pulse magnetic field signal emitted by the radio frequency exciter is converted into a signal by the coil decoupling circuit. The converted signal is then received by the signal receiver for display and imaging.

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