Noise pickup device for detecting electromagnetic noise of a magnetic resonance system

Abstract

A noise pickup device for detecting electromagnetic noise of a magnetic resonance system. The device is provided with a housing. A housing interior forms a accommodating space for the part of the human body to be detected. In the middle of the housing interior, there is a noise pickup coil for picking up spatial electromagnetic interference and the noise induced and coupled to the human body. On both sides of the noise pickup coil in the housing interior, there are respectively a human body surface noise pickup and a clamping mechanism for the detection object. On the outer side of the housing, there is a circuit board, on which there is an impedance matching circuit. The device of the present invention can be closely attached to the imaging object during detection, can accurately acquire the noise or interference introduced by the imaging object, and is easy to fix and operate.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic resonance for medical diagnosis, and particularly to a noise pickup device for detecting noise in magnetic resonance imaging.

Background Art

[0002] Magnetic resonance, as a multi-parameter and multi-contrast imaging technology, is one of the main imaging methods in modern medical imaging. Its advantages such as no radiation and high contrast resolution have significantly surpassed imaging devices such as CT and X-ray machines, and it has been highly regarded in clinical applications. It has become a crucial part of the high-end medical device field. In the future medical device field, magnetic resonance will have greater development and market.

[0003] However, since magnetic resonance imaging systems generally operate in a complex environment with multiple noise sources, if we want to get rid of the limitations of the shielding system and achieve the lightweight, miniaturization and even mobility of magnetic resonance, so as to facilitate the deployment of the magnetic resonance system in any non-shielded but needed departments in the hospital, ambulances and for bedside monitoring, it is necessary to solve the problem of reducing electromagnetic interference noise. Therefore, how to collect and detect the noise or interference introduced by the imaging object in the case of no shielding or incomplete shielding, so as to effectively eliminate electromagnetic interference noise, has become an objective need to be solved urgently.

Summary of the Invention

[0004] The present invention aims to solve the above problems, and provides a noise pickup device for detecting the electromagnetic noise of a magnetic resonance system, which can be closely attached to the imaging object to more accurately acquire the noise or interference introduced by the imaging object, and is easy to fix and operate.

[0005] To achieve the above object, the present invention provides a noise pickup device for detecting the electromagnetic noise of a magnetic resonance system. The device is provided with a housing, a housing interior forms a accommodating space for the human body part to be detected. In the middle of the housing, there is a noise pickup coil for picking up spatial electromagnetic interference and the noise induced and coupled to the human body. On both sides of the noise pickup coil in the housing, there are respectively a human body surface noise pickup device and a detection object clamping mechanism. On the outer side of the housing, there is a circuit board provided with an impedance matching circuit.

[0006] The housing is formed by the first half housing and the second half housing being movably connected in an aligned manner through the detection object clamping mechanism.

[0007] Arc-shaped grooves extending from one end to the other end are respectively provided on the opposite sides of the first half shell and the second half shell. After the first half shell and the second half shell are joined together, a accommodating space for the detected part of the human body is formed. At the parts of the open ends of the first half shell and the second half shell corresponding to the clamping mechanism for the detection object, two outwardly protruding first connection seats and two second connection seats are respectively provided, and the axial positions of the two first connection seats and the two second connection seats are staggered.

[0008] The two first connection seats and the two second connection seats are circular ring-shaped bodies provided with shaft holes, and a part of them protrudes beyond the side walls of the two first connection seats and the two second connection seats.

[0009] The clamping mechanism for the detection object includes a rotating shaft and a compression spring. The compression spring is sleeved on the rotating shaft, and the rotating shaft sleeved with the compression spring is movably inserted into the shaft holes of the two first connection seats and the two second connection seats. The two ends of the compression spring respectively abut against the inner walls of the first half shell and the second half shell, and the detected part of the detection object is clamped by its elastic force, and the noise pickup coil is in a closed state.

[0010] The noise pickup coil includes a first noise pickup coil and a second noise pickup coil, and the first noise pickup coil and the second noise pickup coil are respectively embedded in the inner walls of the first half shell and the second half shell.

[0011] The first noise pickup coil and the second noise pickup coil are one of a rectangular spiral coil, a figure-eight spiral coil, a circle, and a triangle.

[0012] The human body surface noise picker is respectively arranged on the inner walls of the first half shell and the second half shell and protrudes from the inner wall surface, and contacts the human body surface skin of the detection object during use.

[0013] The human body surface noise picker is a sheet-like or point-like body made of a metal material with high electrical conductivity, and is respectively arranged on the inner walls of the first half shell and the second half shell and protrudes from the inner wall surface, and can pick up interference noise alone or be connected into a whole.

[0014] The impedance matching circuit is formed by connecting multiple capacitors and inductors. Among them, the input end of the impedance matching circuit is connected to the noise pickup coil and the body surface noise pickup device through capacitors C1, C2, and C3 respectively, and its output end is connected to the coaxial cable for signal output through inductors L1, L2 and capacitors C4, C5. The contribution of the present invention is that it effectively solves the problem of collecting and detecting the noise or interference introduced by the imaging object in the case of no shielding or incomplete shielding. By providing a noise pickup coil and a body surface noise pickup device that can closely fit the imaging object, the present invention can accurately acquire the noise or interference introduced by the imaging object. At the same time, by providing a clamping type detection object clamping mechanism, the present invention can conveniently and quickly fix and operate the imaging object. The present invention also has the characteristics of simple structure and easy implementation.

Description of the Drawings

[0015] Figure 1 is a three-dimensional schematic diagram of the overall structure of the present invention.

[0016] Figure 2 is Figure 1 the bottom side three-dimensional schematic diagram of

[0017] Figure 3 is a three-dimensional exploded schematic diagram of the components of the present invention.

[0018] Figure 4 is a structural sectional view of the present invention.

[0019] Figure 5 is a schematic diagram of the impedance matching circuit of the present invention.

[0020] Figure 6 is a schematic diagram of the use state of the present invention, where Figure 6A is a schematic diagram of the use state with the detection part being the finger, Figure 6B is a schematic diagram of the use state with the detection part being the wrist.

Detailed Embodiments

[0021] The following embodiments are further explanations and illustrations of the present invention and do not constitute any limitation to the present invention.

[0022] Referring to Figures 1 to 4 , the noise pickup device for detecting the electromagnetic noise of the magnetic resonance system of the present invention includes a housing 10, a body part to be detected accommodation space 20, a noise pickup coil 30, a body surface noise pickup device 40, a detection object clamping mechanism 50, and an impedance matching circuit 70.

[0023] As Figures 1 to 4 shown, the device is provided with a housing 10, which is formed by the first half housing 11 and the second half housing 12 being movably connected in a butted manner through the detection object clamping mechanism 50.

[0024] As shown Figure 3 in the figure, the first half shell 11 and the second half shell 12 are rectangular groove-shaped bodies. Semi-circular grooves 111 and 121 extending from one end to the other end are respectively provided on the opposite sides of the first half shell 11 and the second half shell 12. In other embodiments, the grooves 111 and 121 may also be semi-elliptical. After the first half shell 11 and the second half shell 12 are joined together, a accommodating space 20 for the human body part to be detected is formed. The accommodating space 20 for the human body part to be detected is a cavity with a circular or elliptical cross-section. When detecting, the human body part to be detected is placed in this accommodating space. As shown Figure 3 in the figure, two outwardly protruding first connecting seats 112 and 122 and two second connecting seats 113 and 123 are respectively provided at the open ends of the first half shell 11 and the second half shell 12. The first connecting seats 112 and 122 and the second connecting seats 113 and 123 correspond to the positions of the detecting object clamping mechanism 50, and the axial positions of the two first connecting seats 112 and 122 are staggered from those of the two second connecting seats 113 and 123 so as to form an axial connection. The two first connecting seats 112 and 122 and the two second connecting seats 113 and 123 are annular bodies provided with shaft holes, and a part of them protrudes outside the side walls of the two first connecting seats 112 and 122 and the two second connecting seats 113 and 123. The first connecting seats 112 and 122 and the second connecting seats 113 and 123 are connected by the detecting object clamping mechanism 50.

[0025] As shown Figure 3 in the figure, the detecting object clamping mechanism 50 includes a rotating shaft 51 and a compression spring 52. The compression spring 52 is sleeved on the rotating shaft 51. The rotating shaft 51 sleeved with the compression spring 52 is movably inserted into the shaft holes of the two first connecting seats 112 and 122 and the two second connecting seats 113 and 123. The two ends of the compression spring 52 are respectively pressed against the inner walls of the first half shell 11 and the second half shell 12. As shown Figure 4 in the figure, when the detecting object enters the accommodating space 20 for the human body part to be detected, the pressure exerted by the two ends of the compression spring 52 on the first half shell 11 and the second half shell 12 causes the other end of the shell 10 to rotate inwardly around the rotating shaft 51, clamping the detecting part of the detecting object by the elastic force and making the noise pickup coil in a closed state.

[0026] As shown Figure 3 and Figure 4As shown, a noise pickup coil 30 is provided in the middle of the housing 10 for picking up spatial electromagnetic interference and the noise induced and coupled to the human body. The noise pickup coil 30 includes a first noise pickup coil 31 and a second noise pickup coil 32. The first noise pickup coil 31 and the second noise pickup coil 32 have the same structure, and are respectively embedded in the inner walls of the first half housing 11 and the second half housing 12. The first noise pickup coil 31 and the second noise pickup coil 32 are one of a rectangular spiral coil, a figure-eight spiral coil, a circle, and a triangle. In this embodiment, the first noise pickup coil 31 and the second noise pickup coil 32 are preferably the rectangular spiral coil as shown in Figure 3 shown.

[0027] As Figure 3 , Figure 4 shown, a human body surface noise pickup 40 and a detection object clamping mechanism 50 are respectively provided on both sides of the noise pickup coil 30 in the housing 10. Among them, the structure of the detection object clamping mechanism 50 is as described above. The human body surface noise pickup 40 is a sheet or point-like body made of a metal material with high electrical conductivity, such as gold, silver, copper, and aluminum. It is respectively arranged on the inner walls of the first half housing 11 and the second half housing 12 and protrudes from the inner wall surface. When in use, it contacts the human body surface skin of the detection object and can pick up interference noise separately or integrally.

[0028] In Figure 6A the shown embodiment, the finger of the detector is inserted into the accommodating space 20 of the detected part for detection. In Figure 6B another shown embodiment, the wrist of the detector is inserted into the accommodating space 20 of the detected part for detection.

[0029] As Figure 2 , Figure 4 shown, a cavity 124 is provided at the bottom of the second half housing 12. A circuit board 60 is provided in the cavity 124, and an impedance matching circuit 70 is provided on the circuit board 60. As Figure 5 shown, the impedance matching circuit 70 is formed by connecting a plurality of capacitors and inductors. As Figure 5 shown, the input end of the impedance matching circuit is connected to the noise pickup coil 30 through capacitors C1, C2, and C3. In another embodiment, the input end of the impedance matching circuit is connected to the human body surface noise pickup 40 through capacitors C1, C2, and C3, and its output end is connected to a coaxial cable 71 for signal output through inductors L1, L2, and capacitors C4, C5. The impedance matching circuit 70 is used to match the impedance of the noise pickup coil or the surface noise pickup to be consistent with the impedance of the RF coaxial cable, ensure the maximum transmission of the noise signal near the frequency of the magnetic resonance signal, and filter out the noise signals outside the frequency near the magnetic resonance signal.

[0030] Accordingly, the present invention arranges a noise pickup coil 30 and a human body surface noise picker 40 in the accommodation space 20 of the detected part of the human body, and makes them in close contact with the surface of the detected object through the detection object clamping mechanism 50, so as to quickly and efficiently pick up interference noise.

[0031] Although the present invention has been disclosed through the above embodiments, the protection scope of the present invention is not limited thereto. Without departing from the concept of the present invention, deformations, substitutions, etc. made to the above components will all fall within the scope of the claims of the present invention.

Claims

1. A noise pickup device for detecting electromagnetic noise of a magnetic resonance system, characterized in that The device is provided with a housing (10). A accommodating space (20) for the detected part of the human body is formed inside the housing (10). A noise pickup coil (30) is provided in the middle inside the housing (10) for picking up spatial electromagnetic interference and the noise inductively coupled to the human body. On both sides of the noise pickup coil (30) inside the housing (10), a human body surface noise pickup (40) and a clamping mechanism (50) for the detection object are respectively provided. A circuit board (60) is provided outside the housing, and an impedance matching circuit (70) is provided thereon. The housing (10) is formed by the first half housing (11) and the second half housing (12) which are movably connected in an opposed manner through the clamping mechanism (50) for the detection object. The noise pickup coil (30) includes a first noise pickup coil (31) and a second noise pickup coil (32). The first noise pickup coil (31) and the second noise pickup coil (32) are respectively embedded in the inner walls of the first half housing (11) and the second half housing (12). The human body surface noise pickups (40) are respectively arranged on the inner walls of the first half housing (11) and the second half housing (12) and protrude from the inner wall surface, and contact the human body surface skin of the detection object during use. The impedance matching circuit (70) is formed by connecting a plurality of capacitors and inductors. Among them, the input end of the impedance matching circuit is connected to the noise pickup coil (30) and the human body surface noise pickup (40) respectively through capacitors C1, C2, and C3. Its output end is connected to a coaxial cable (71) for signal output through inductors L1, L2, and capacitors C4, C5. Specifically, the capacitor C1 is connected in parallel at both ends of the noise pickup coil (30) and the human body surface noise pickup (40). One end of the capacitor C1 is connected to one end of the capacitor C2. The other end of the capacitor C2 is respectively connected to one end of the inductor L1 and one end of the capacitor C5. The other end of the inductor L1 is respectively connected to one end of the capacitor C4 and one end of the coaxial cable (71). The other end of the capacitor C4 is connected to one end of the capacitor C3. The other end of the capacitor C5 is respectively connected to one end of the inductor L2 and the other end of the coaxial cable (71). The other end of the inductor L2 is connected to one end of the capacitor C3. The other end of the capacitor C3 is connected to the other end of the capacitor C1.

2. The noise pickup device for detecting electromagnetic noise of a magnetic resonance system according to claim 1, wherein Arc-shaped grooves (111, 121) extending from one end to the other end are respectively provided on the opposite sides of the first half housing (11) and the second half housing (12). After the first half housing (11) and the second half housing (12) are connected in an opposed manner, the accommodating space (20) for the detected part of the human body is formed. At the positions corresponding to the clamping mechanism (50) for the detection object at the open ends of the first half housing (11) and the second half housing (12), two outwardly protruding first connection seats (112, 122) and two second connection seats (113, 123) are respectively provided, and the axial positions of the two first connection seats (112, 122) and the two second connection seats (113, 123) are staggered.

3. The noise pickup device for detecting the electromagnetic noise of a magnetic resonance system according to claim 2, characterized in that, The two first connecting seats (112, 122) and the two second connecting seats (113, 123) are circular ring bodies provided with shaft holes, and a part of them protrudes outside the side walls of the two first connecting seats (112, 122) and the two second connecting seats (113, 123).

4. The noise pickup device for detecting electromagnetic noise of a magnetic resonance system according to claim 1, characterized in that, The detection object clamping mechanism (50) includes a rotating shaft (51) and a compression spring (52). The compression spring (52) is sleeved on the rotating shaft (51). The rotating shaft (51) sleeved with the compression spring (52) is movably inserted into the shaft holes of the two first connecting seats (112, 122) and the two second connecting seats (113, 123). The two ends of the compression spring (52) are respectively pressed against the inner walls of the first half shell (11) and the second half shell (12), and the detection part of the detection object is clamped by its elastic force, and the noise pickup coil is in a closed state.

5. The noise pickup device for detecting electromagnetic noise of a magnetic resonance system according to claim 1, wherein, The first noise pickup coil (31) and the second noise pickup coil (32) are one of a rectangular spiral coil, an eight-shaped spiral coil, a circle, and a triangle.

6. The noise pickup device for detecting electromagnetic noise of a magnetic resonance system according to claim 1, wherein, The human body surface noise pickup (40) is a sheet or point-shaped body made of a metal material with high electrical conductivity, and is respectively arranged on the inner walls of the first half shell (11) and the second half shell (12) and protrudes from the inner wall surface, and can pick up interference noise alone or be connected into one body to pick up.

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