Non-contact cardiac signal detection antenna suitable for magnetic resonance system

Abstract

The invention provides a non-contact cardiac signal detection antenna compatible with magnetic resonance, and relates to medical signal monitoring. The magnetic resonance compatible non-contact cardiac signal detection antenna comprises a dielectric substrate, and a left frame extending to the top of the dielectric substrate along the left edge of the dielectric substrate, a right frame extending to the top of the dielectric substrate along the right edge of the dielectric substrate and a bottom frame arranged at the bottom of the dielectric substrate are arranged on the lower surface of the dielectric substrate; a left capacitor slot is formed in the left frame at the left edge of the dielectric substrate, and a right capacitor slot is formed in the right frame at the right edge of the dielectric substrate; a top slot is formed between the left frame and the right frame at the top of the dielectric substrate; the left side of the bottom frame is provided with a left transverse slotting group, and the right side of the bottom frame is provided with a right transverse slotting group; the top of the bottom frame is further provided with an adaptive slotting set. The upper surface of the dielectric substrate is provided with a micro-strip feeder line and a monopole radiation ring which is connected with the micro-strip feeder line and is not closed.

Description

Technical Field

[0001] The invention relates to the field of medical signal monitoring, and in particular to a non-contact cardiac signal detection antenna suitable for a magnetic resonance system. Background Art

[0002] The image superposition principle is used in magnetic resonance imaging. A series of radio frequency pulse signals are emitted within a certain period of time and the signals are repeatedly collected to reconstruct the magnetic resonance image. Therefore, during the scan, the patient is required to be as still as possible to prevent motion artifacts. At the same time, ECG gating and respiratory gating are used according to different needs to reduce image artifacts caused by the patient's physiological movement. ECG gating signals can also capture different contraction and relaxation phases of the heart, which is convenient for doctors to evaluate heart function. At present, ECG ECG gating is mainly used in magnetic resonance to collect cardiac signals. Before scanning, medical staff need to stick the electrode patch in the required position to ensure a stable cardiac signal. For some patients (such as those with high skin resistance or dry skin), it is difficult for ECG electrodes to obtain effective cardiac signals, and ECG electrodes are in direct contact with the human body. Long-term use will cause redness or allergies on the skin of some patients. Therefore, in order to improve the patient's scanning comfort and reduce the preparation time for cardiac magnetic resonance scanning, non-contact ECG monitoring has become a research hotspot.

[0003] There are currently two main MRI-compatible non-contact ECG monitoring methods. The first is to use the receiving coil of the MRI scan to process the received signal. During the process of cardiac contraction and relaxation, the conductivity of the myocardial space changes, resulting in the generation of a secondary magnetic field on the receiving coil formed by eddy current changes. By encoding the secondary magnetic field, the cardiac signal can be obtained.

[0004] Another way is to use millimeter wave radar, placing the transmitting and receiving antennas inside or outside the magnetic resonance cavity wall 40 to 50 cm away from the human body to receive cardiac signals. Since the transmitting and receiving antennas are separated from each other, the antenna array is large and requires a special device to fix it, which is inconvenient to operate.

[0005] The MRI-compatible non-contact cardiac signal detection antenna does not require electrodes to be attached to the skin surface. It can collect stable cardiac signals in the case of free breathing, simplifying the preparation steps for MRI scanning and reducing the patient's preparation time. It avoids unstable signals caused by poor electrode contact, is more comfortable to use, and is suitable for long-term monitoring of sensitive people. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a magnetic resonance compatible non-contact cardiac signal detection antenna. The present invention does not need to be fixed when in use and can be directly placed on the chest of the human body. The bandwidth of the detection antenna is 230MHz, which can be compatible with magnetic resonance while ensuring that the detection antenna can receive stable cardiac signals within a certain area.

[0007] The present invention provides a magnetic resonance compatible non-contact cardiac signal detection antenna, comprising a dielectric substrate, wherein a left frame extending from a left edge of the dielectric substrate to the top of the dielectric substrate, a right frame extending from a right edge of the dielectric substrate to the top of the dielectric substrate, and a bottom frame arranged at the bottom of the dielectric substrate are arranged on the lower surface of the dielectric substrate; a left capacitor slot is arranged on the left frame located at the left edge of the dielectric substrate, and a right capacitor slot is arranged on the right frame located at the right edge of the dielectric substrate; a top slot is formed between the left frame and the right frame located at the top of the dielectric substrate; a left transverse slot group is arranged on the left side of the bottom frame, and a right transverse slot group is arranged on the right side of the bottom frame; an adaptive slot group is also arranged on the top of the bottom frame; and a microstrip feeder and a monopole radiation ring connected to the microstrip feeder and not closed are arranged on the upper surface of the dielectric substrate.

[0008] In a feasible implementation, when the detection antenna has a human body as a load, the reflection coefficient |S 11 |<-10dB in the range of 755~985MHz; when the dual pickup coils are mutually coupled|S 21 |<-80dB, the detection antenna is at 128MHz |S 21 |<-68dB.

[0009] In a feasible implementation manner, the thickness of the detection antenna is 0.5-1 mm, the length of the detection antenna is 100-120 mm, the width of the detection antenna is 80-100 mm, the dielectric constant of the detection antenna is 3-4 F / m, and the input impedance of the detection antenna is 25-75 Ω; and / or the impedance of the microstrip feeder is 25-75 Ω, and the width of the microstrip feeder is 1-2 mm.

[0010] In a feasible implementation manner, the left transverse groove group includes a plurality of left transverse grooves arranged in parallel, the number of the left transverse grooves is 5 to 8, the length of the left transverse grooves is 26 to 31 mm, the width of the left transverse grooves is 2 to 4 mm, and the spacing distance between adjacent left transverse grooves is 1 to 3 mm.

[0011] In a feasible implementation manner, the left transverse groove is the first left transverse groove or the second left transverse groove; the length of the first left transverse groove is 31 mm, and the width of the first left transverse groove is 3 mm; the length of the second left transverse groove is 26 mm, and the width of the second left transverse groove is 3 mm; the first left transverse groove and the second left transverse groove are spaced apart.

[0012] In a feasible embodiment, the right transverse groove group includes a plurality of right transverse grooves arranged in parallel, the number of the right transverse grooves is 5 to 8, the length of the right transverse grooves is 26 to 31 mm, the width of the right transverse grooves is 2 to 4 mm, and the spacing distance between adjacent right transverse grooves is 1 to 3 mm.

[0013] In a feasible embodiment, the right transverse groove is the first right transverse groove or the second right transverse groove; the length of the first right transverse groove is 31 mm, and the width of the first right transverse groove is 3 mm; the length of the second right transverse groove is 26 mm, and the width of the second right transverse groove is 3 mm; the first right transverse groove and the second right transverse groove are spaced apart, and the spacing distance is 2 mm.

[0014] In a feasible implementation manner, the length of the left capacitor slot is 1 to 2 mm; and / or, the length of the right capacitor slot is 1 to 2 mm; and / or, the length of the top slot is 15 to 25 mm.

[0015] In a feasible implementation manner, the adaptive slot group includes a first adaptive slot with a slot direction toward the top of the bottom frame and a second adaptive slot connected to the first adaptive slot.

[0016] In a feasible embodiment, the length of the first adaption groove is 10-14 mm, and the width of the first adaption groove is 0.5-1.5 mm; and / or the length of the second adaption groove is 12-16 mm, and the width of the second adaption groove is 4-8 mm.

[0017] The magnetic resonance compatible non-contact cardiac signal detection antenna provided by the present invention has the following beneficial effects: the present invention does not need to be fixed when in use, and can be placed between the human body and the magnetic resonance receiving coil, or placed on the magnetic resonance receiving coil, so that cardiac signals can be collected under free breathing conditions. In addition, the bandwidth of the detection antenna is 230MHz, which can ensure that the detection antenna can receive stable cardiac signals within a certain area while being compatible with magnetic resonance. In addition, when the detection antenna has a human body as a load, the reflection coefficient |S 11 |<-10dB in the range of 755~985MHz; when the dual pickup coils are mutually coupled|S 21 |<-80dB, the detection antenna is at 128MHz |S 21 |<-68dB. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the lower surface of the dielectric substrate in the present invention.

[0019] Figure 2It is a schematic structural diagram of the upper surface of the dielectric substrate in the present invention.

[0020] Figure 3 It is the reflection coefficient diagram of the present invention.

[0021] Figure 4 This is a test diagram of the spherical water phantom of the present invention.

[0022] Figure 5 This is the distortion diagram of ΔB0 in the present invention.

[0023] Figure 6 This is the distortion diagram of ΔB1 in the present invention.

[0024] Figure 7 This is a diagram showing the use of the present invention under magnetic resonance.

[0025] Figure 8 The figure is a comparison between the ECG signal actually measured in 3T magnetic resonance imaging of the present invention and the signal waveform of the detection antenna.

[0026] Reference numerals

[0027] Dielectric substrate 1

[0028] Left border 2

[0029] Left capacitor slot 21

[0030] Right border 3

[0031] Right capacitor slot 31

[0032] Top slot 4

[0033] Bottom border 5

[0034] Left horizontal slotting group 51

[0035] Left horizontal slot 51.1

[0036] First left transverse slot 51.1a

[0037] Second left transverse slot 51.1b

[0038] Right horizontal slotting group 52

[0039] Right horizontal slot 52.1

[0040] First right transverse slot 52.1a

[0041] Second right transverse slot 52.1b

[0042] Adaptive slotting group 53

[0043] First adaptation slot 53.1

[0044] Second adaptation slot 53.2

[0045] Microstrip feed line 6

[0046] Monopole radiating ring 7 DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work belong to the scope of protection of the present invention. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "left side", "right side", "upper side", "lower side", "above", "below" and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0050] The embodiment of the present invention provides a magnetic resonance compatible non-contact cardiac signal detection antenna. Figure 1 , comprising a dielectric substrate 1, a left frame 2 extending from the left edge of the dielectric substrate 1 to the top of the dielectric substrate 1, a right frame 3 extending from the right edge of the dielectric substrate 1 to the top of the dielectric substrate 1 and a bottom frame 5 arranged at the bottom of the dielectric substrate 1 are arranged on the lower surface of the dielectric substrate 1, the lower surface and the upper surface of the dielectric substrate 1 are only used for description purposes and have no special meanings, the left frame 2 and the right frame 3 are L-shaped as a whole, and are generally made of metal. Continue reading Figure 1A left capacitor slot 21 is provided in the left frame 2 located at the left edge of the dielectric substrate 1, and a right capacitor slot 31 is provided in the right frame 3 located at the right edge of the dielectric substrate 1. Capacitors are usually provided in the left capacitor slot 21 and the right capacitor slot 31, and the capacitors can achieve the function of passing AC and blocking DC; a top slot 4 is formed between the left frame 2 and the right frame 3 located at the top of the dielectric substrate 1, and the slot is usually used to adjust the antenna resonant frequency; a left horizontal slot group 51 is provided on the left side of the bottom frame 5, and a right horizontal slot group 52 is provided on the right side of the bottom frame 5; an adaptive slot group 53 is also provided on the top of the bottom frame 5. Figure 2 The upper surface of the dielectric substrate 1 is provided with a microstrip feeder 6 and a monopole radiation ring 7 connected to the microstrip feeder 6 and not closed. The bottom of the microstrip feeder 6 and the bottom of the bottom frame 5 can receive and transmit the device externally through the antenna coaxial line. As an illustration, the detection antenna provided by the present invention does not need to be fixed when in use, and can be directly placed on the chest of the human body; at the same time, refer to Figure 3 When a human body is used as a load, the reflection coefficient of the detection antenna provided by the present invention |S 11 |<-10dB in the range of 755~985MHz; when the dual pickup coils are mutually coupled|S 21 |<-80dB, the detection antenna provided by the present invention is at 128MHz |S 21 |<-68dB. In addition, the frequency band of the detection antenna provided by the present invention should not be too wide in order to ensure the matching effect of the detection antenna at the working frequency, so as to avoid the measured cardiac signal amplitude being too low due to poor matching. The frequency band of the detection antenna should also not be too narrow. A too narrow frequency band will cause the range of the human body in which the detection antenna can stably receive signals to become smaller, so that the detection antenna needs to constantly look for a position with a good detection effect when in use, which brings instability to use. Therefore, the magnetic resonance-compatible non-contact cardiac signal detection antenna of the present invention has a bandwidth of 230MHz, which ensures that the antenna can receive stable cardiac signals within a certain area.

[0051] About the left capacitor slot 21 and the right capacitor slot 31: The left capacitor slot 21 and the right capacitor slot 31 can reduce the continuous metal area of ​​the left frame and the right frame while ensuring the length of the surface current path. In a specific embodiment, the length of the left capacitor slot 21 is 1 to 2 mm, preferably 1.6 mm; the length of the right capacitor slot 31 is 1 to 2 mm, preferably 1.6 mm; the length of the top slot 4 is 15 to 25 mm, preferably 20 mm. By adjusting the capacitance value and the length and position of the left capacitor slot 21 and the right capacitor slot 31, the response of the antenna at the 3T magnetic resonance operating frequency (128 MHz) can be optimized, thereby reducing the impact on the magnetic resonance image. In addition, this frame-shaped structure can reduce the resonant frequency of the detection antenna, effectively reducing the size of the detection antenna.

[0052] About the monopole radiation ring 7: The monopole radiation ring 7 adopts a microstrip monopole radiation structure. The non-closed ring design not only avoids the formation of a metal loop and reduces the generation of large eddy currents in the magnetic resonance system, but also reduces parasitic inductance and improves electromagnetic compatibility.

[0053] In a magnetic resonance-compatible non-contact cardiac signal detection antenna provided in an embodiment of the present invention, the thickness of the detection antenna is 0.5-1 mm, preferably 0.81 mm; the length of the detection antenna is 100-120 mm, preferably 110 mm; the width of the detection antenna is 80-100 mm, preferably 90 mm; the dielectric constant of the detection antenna is 3-4 F / m, preferably 3.38 F / m, and in principle the dielectric constant can be a commonly used dielectric constant value; the input impedance of the detection antenna is 25-75 Ω, preferably 50 Ω; the impedance of the microstrip feed line 6 is 25-75 Ω, preferably 50 Ω; the width of the microstrip feed line 6 is 1-2 mm, preferably 1.88 mm; the material of the dielectric substrate 1 is Rogers 4003C, and the hard substrate ensures that the frequency band of the detection antenna will not be offset due to violent activities and substrate deformation. As an illustration, the detection antenna adopts the form of a defective monopole microstrip antenna. First of all, considering that metal will produce artifacts on the magnetic resonance system, the selection of a defective monopole microstrip antenna can reduce the metal area of ​​the detection antenna as much as possible, and ensure the working bandwidth of the detection antenna under the condition of a thinner dielectric substrate 1 thickness and a smaller volume. In addition, the use of a defective monopole microstrip antenna as the antenna form of the present invention can reduce the volume, make it as insensitive as possible, and improve the comfort of patients.

[0054] In the magnetic resonance compatible non-contact cardiac signal detection antenna provided by the embodiment of the present invention, referring to Figure 1 The left transverse groove group 51 includes a plurality of left transverse grooves 51.1 arranged in parallel, the number of the left transverse grooves 51.1 is 5 to 8, preferably 6, the length of the left transverse groove 51.1 is 26 to 31 mm, preferably 26 mm and 31 mm, the width of the left transverse groove 51.1 is 2 to 4 mm, preferably 3 mm, and the spacing distance between adjacent left transverse grooves 51.1 is 1 to 3 mm, preferably 2 mm. Further, the left transverse groove 51.1 is the first left transverse groove 51.1a or the second left transverse groove 51.1b; the length of the first left transverse groove 51.1a is 31 mm, and the width of the first left transverse groove 51.1a is 3 mm; the length of the second left transverse groove 51.1b is 26 mm, and the width of the second left transverse groove 51.1b is 3 mm; the first left transverse groove 51.1a and the second left transverse groove 51.1b are arranged at intervals, and the so-called interval arrangement here can be referred to. Figure 1, that is, they are arranged in the order of the first left transverse groove 51.1a, the second left transverse groove 51.1b, the first left transverse groove 51.1a, and the second left transverse groove 51.1b.

[0055] In the magnetic resonance compatible non-contact cardiac signal detection antenna provided by the embodiment of the present invention, referring to Figure 1 The right transverse groove group 52 includes a plurality of right transverse grooves 52.1 arranged in parallel, the number of the right transverse grooves 52.1 is 5 to 8, preferably 6, the length of the right transverse groove 52.1 is 26 to 31 mm, preferably 26 mm and 31 mm, the width of the right transverse groove 52.1 is 2 to 4 mm, preferably 3 mm, and the spacing distance between adjacent right transverse grooves 52.1 is 1 to 3 mm, preferably 2 mm. Further, the right transverse groove 52.1 is the first right transverse groove 52.1a or the second right transverse groove 52.1b; the length of the first right transverse groove 52.1a is 31 mm, and the width of the first right transverse groove 52.1a is 3 mm; the length of the second right transverse groove 52.1b is 26 mm, and the width of the second right transverse groove 52.1b is 3 mm; the first right transverse groove 52.1a and the second right transverse groove 52.1b are arranged at intervals, and the so-called interval arrangement here can be referred to. Figure 1 , that is, they are arranged in the order of the first right transverse groove 52.1a, the second right transverse groove 52.1b, the first right transverse groove 52.1a, and the second right transverse groove 52.1b.

[0056] In one specific embodiment, see Figure 1 The number of the left transverse slots 51.1 and the right transverse slots 52.1 are both 6, totaling 12, and the left transverse slots 51.1 and the right transverse slots 52.1 are symmetrically arranged, the first left transverse slot 51.1 from top to bottom is the first left transverse slot 51.1a, the second left transverse slot 51.1 is the second left transverse slot 51.1b, and so on, the right transverse slot 52.1 is the same. The left transverse slots 51.1 and the right transverse slots 52.1 can reduce the continuous metal area without affecting the antenna performance, and reduce the generation of eddy currents and image artifacts in the magnetic resonance system.

[0057] In the magnetic resonance compatible non-contact cardiac signal detection antenna provided in the embodiment of the present invention, referring to Figure 1, the adaptive slot group 53 includes a first adaptive slot 53.1 with the slot direction facing the top of the bottom frame 5 and a second adaptive slot 53.2 connected to the first adaptive slot 53.1. In a specific embodiment, the length of the first adaptive slot 53.1 is 10 to 14 mm, preferably 12 mm; the width of the first adaptive slot 53.1 is 0.5 to 1.5 mm, preferably 1 mm; the length of the second adaptive slot 53.2 is 12 to 16 mm, preferably 14 mm, and the width of the second adaptive slot 53.2 is 4 to 8 mm, preferably 6 mm. The first adaptive slot 53.1 and the second adaptive slot 53.2 designed by the present invention can ensure that the input impedance of the detection antenna is 50Ω, and are compatible with the transceiver module without any additional matching circuit.

[0058] The present invention also provides a method for using a magnetic resonance compatible non-contact cardiac signal detection antenna. When in use, the detection antenna is placed on the chest of a human body or on a magnetic resonance receiving coil.

[0059] Embodiment 1

[0060] In the non-contact cardiac signal detection antenna of the present invention, the detection antenna uses a side-feed method and is connected to a transceiver module via a coaxial line for ECG gating signals in a magnetic resonance system. At the same time, in order to avoid artifacts caused by a metal SMA connector on a magnetic resonance image, a coaxial line is directly welded to the detection antenna.

[0061] In the non-contact cardiac signal detection antenna of the present invention, the length of the left capacitor slot 21 is 1.6 mm, the length of the right capacitor slot 31 is 1.6 mm, and the length of the top slot 4 is 20 mm. The thickness of the detection antenna is 0.81 mm, the length of the detection antenna is 110 mm, the width of the detection antenna is 90 mm, the dielectric constant of the detection antenna is 3.38 F / m, the input impedance of the detection antenna is 50 Ω, the impedance of the microstrip feeder 6 is 50 Ω, and the width of the microstrip feeder 6 is 1.88 mm. The number of the left transverse slots 51.1 and the number of the right transverse slots 52.1 are both 6, the length of the first left transverse slot 51.1a is 31mm, the width of the first left transverse slot 51.1a is 3mm, the length of the second left transverse slot 51.1b is 26mm, the width of the second left transverse slot 51.1b is 3mm, the first left transverse slot 51.1a and the second left transverse slot 51.1b are arranged at intervals, and the first right transverse slot 52.1a and the second right transverse slot 52.1b are arranged at intervals of 2mm. The length of the first adapting slot 53.1 is 12mm, the width of the first adapting slot 53.1 is 1mm, the length of the second adapting slot 53.2 is 14mm, and the width of the second adapting slot 53.2 is 6mm.

[0062] Testing the detection antenna in the above embodiment;

[0063] 1) Use the dual pickup coil test to detect the size of the antenna in the near field. The actual test results show that the dual pickup coil mutual coupling |S 21 |<-80dB, at 128MHz |S 21 |<-68dB, indicating that the coupling of this embodiment at 128MHz is extremely small.

[0064] 2) The detection antenna in this embodiment is placed on a spherical water phantom in a 3T magnetic resonance system for testing, and the B0 field image and B1 field image obtained by scanning are compared with the spherical water film image without the antenna and the difference is made. When the antenna transmission power is 6dBm, Figure 4 The cut surface shown Figure 5 The ΔB0 distortion diagram and Figure 6 The ΔB1 distortion diagram shown. At the detection antenna placement position (below the circle), the maximum ΔB0 distortion of the section is 0.325ppm, the standard deviation is 0.037ppm, and the standard deviation of ΔB1 distortion is 4.37%.

[0065] also, Figure 7 The demonstration shows that when preparing for an MRI scan, the detection antenna is placed in the middle of the patient's chest, and the antenna coaxial line is connected to the transceiver module. The patient remains still and breathes freely, and a stable cardiac signal can be collected, which can be used as a trigger gate for the MRI scan. Figure 8 It is a comparison between the ECG signal measured in 3T magnetic resonance and the signal waveform of the detection antenna. During magnetic resonance scanning, the antenna can stably transmit cardiac signals under free breathing.

[0066] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A magnetic resonance compatible non-contact cardiac signal detection antenna, characterized in that: The dielectric substrate (1) comprises a left frame (2) extending along the left edge of the dielectric substrate (1) to the top of the dielectric substrate (1), a right frame (3) extending along the right edge of the dielectric substrate (1) to the top of the dielectric substrate (1), and a bottom frame (5) provided at the bottom of the dielectric substrate (1); A left capacitor slot (21) is provided in a left frame (2) located at the left edge of the dielectric substrate (1), and a right capacitor slot (31) is provided in a right frame (3) located at the right edge of the dielectric substrate (1); a top slot (4) is formed between the left frame (2) and the right frame (3) located at the top of the dielectric substrate (1); A left transverse slot group (51) is provided on the left side of the bottom frame (5), and a right transverse slot group (52) is provided on the right side of the bottom frame (5); an adaptive slot group (53) is also provided on the top of the bottom frame (5); A microstrip feed line (6) and a non-enclosed monopole radiation ring (7) connected to the microstrip feed line (6) are provided on the upper surface of the dielectric substrate (1).

2. The magnetic resonance compatible non-contact cardiac signal detection antenna according to claim 1, characterized in that: When the detection antenna has a human body as a load, the reflection coefficient |S 11 |<-10dB in the range of 755~985MHz; When the dual pickup coils are mutually coupled |S 21 |<-80dB, the detection antenna is at 128MHz |S 21 |<-68dB.

3. The magnetic resonance compatible non-contact cardiac signal detection antenna according to claim 1, characterized in that: The thickness of the detection antenna is 0.5 to 1 mm, the length of the detection antenna is 100 to 120 mm, the width of the detection antenna is 80 to 100 mm, the dielectric constant of the detection antenna is 3 to 4 F / m, and the input impedance of the detection antenna is 25 to 75 Ω; and / or the impedance of the microstrip feed line (6) is 25 to 75 Ω, and the width of the microstrip feed line (6) is 1 to 2 mm.

4. The magnetic resonance compatible non-contact cardiac signal detection antenna according to claim 1, characterized in that: The left transverse slot group (51) comprises a plurality of left transverse slots (51.1) arranged in parallel, the number of the left transverse slots (51.1) is 5 to 8, the length of the left transverse slots (51.1) is 26 to 31 mm, the width of the left transverse slots (51.1) is 2 to 4 mm, and the spacing distance between adjacent left transverse slots (51.1) is 1 to 3 mm.

5. The magnetic resonance compatible non-contact cardiac signal detection antenna according to claim 4, characterized in that: The left transverse groove (51.1) is a first left transverse groove (51.1a) or a second left transverse groove (51.1b); the length of the first left transverse groove (51.1a) is 31 mm, and the width of the first left transverse groove (51.1a) is 3 mm; the length of the second left transverse groove (51.1b) is 26 mm, and the width of the second left transverse groove (51.1b) is 3 mm; the first left transverse groove (51.1a) and the second left transverse groove (51.1b) are arranged at intervals.

6. The magnetic resonance compatible non-contact cardiac signal detection antenna according to claim 1, characterized in that: The right transverse slot group (52) comprises a plurality of right transverse slots (52.1) arranged in parallel, the number of the right transverse slots (52.1) is 5 to 8, the length of the right transverse slots (52.1) is 26 to 31 mm, the width of the right transverse slots (52.1) is 2 to 4 mm, and the spacing distance between adjacent right transverse slots (52.1) is 1 to 3 mm.

7. The magnetic resonance compatible non-contact cardiac signal detection antenna according to claim 6, characterized in that: The right transverse groove (52.1) is a first right transverse groove (52.1a) or a second right transverse groove (52.1b); the length of the first right transverse groove (52.1a) is 31 mm, and the width of the first right transverse groove (52.1a) is 3 mm; the length of the second right transverse groove (52.1b) is 26 mm, and the width of the second right transverse groove (52.1b) is 3 mm; the first right transverse groove (52.1a) and the second right transverse groove (52.1b) are arranged at intervals, and the interval distance is 2 mm.

8. The magnetic resonance compatible non-contact cardiac signal detection antenna according to claim 1, characterized in that: The length of the left capacitor slot (21) is 1 to 2 mm; and / or the length of the right capacitor slot (31) is 1 to 2 mm; and / or the length of the top slot (4) is 15 to 25 mm.

9. The magnetic resonance compatible non-contact cardiac signal detection antenna according to claim 1, characterized in that: The adaptive slot group (53) comprises a first adaptive slot (53.1) with a slot direction toward the top of the bottom frame (5) and a second adaptive slot (53.2) connected to the first adaptive slot (53.1).

10. The magnetic resonance compatible non-contact cardiac signal detection antenna according to claim 9, characterized in that: The length of the first adapting groove (53.1) is 10 to 14 mm, and the width of the first adapting groove (53.1) is 0.5 to 1.5 mm; and / or the length of the second adapting groove (53.2) is 12 to 16 mm, and the width of the second adapting groove (53.2) is 4 to 8 mm.

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