CN-121971068-A - Radar control device suitable for non-contact heart rate measurement

Abstract

The invention provides a radar control device suitable for non-contact heart rate measurement, and relates to the technical field of detection of magnetic resonance imaging and microwave radar intersection. The heart rate signal processing device comprises a shielding shell, wherein a circuit board is arranged in the shielding shell, a circuit is arranged in the circuit board, the circuit comprises a sending module, a signal receiving and sending module and a receiving module, the signal receiving and sending module is connected with the sending module and the receiving module in series respectively, the sending module is used for generating an oscillating signal and sending the oscillating signal to the signal receiving and sending the oscillating signal outwards, and the receiving module is used for forwarding a received external heart rate signal to the receiving module and processing the heart rate signal. The invention realizes the real-time control of the microstrip antenna by generating, conditioning and transmitting the 2.4GHz radio frequency carrier signal and matching with the microstrip antenna, captures the micro Doppler signal of the chest cavity movement of the human body caused by heart beating, and finally provides an accurate heart rate triggering gating signal for heart magnetic resonance imaging.

Inventors

• REN ZHIHUA
• CAI ZHENGYU
• QIN XIAOHUA

Assignees

• 上海科技大学
• 上海联影医疗科技股份有限公司

Dates

Publication Date

20260505

Application Date

20260204

Claims (10)

1. 1. A radar control device adapted for non-contact heart rate measurement, comprising: The circuit board is arranged in the shielding shell, and a circuit is arranged in the circuit board; The circuit comprises a sending module, a signal receiving and sending module and a receiving module, wherein the signal receiving and sending module is respectively connected with the sending module and the receiving module in series, the sending module is used for generating an oscillating signal and sending the oscillating signal to the signal receiving and sending the oscillating signal outwards, the receiving module is used for forwarding a received external heart rate signal to the receiving module, and the receiving module is used for processing the heart rate signal.
2. 2. The radar control device according to claim 1, wherein the transmitting module includes a voltage-controlled oscillator and a first equalizer connected to each other, the first equalizer dividing the oscillation signal into two oscillation differential signals, one of which is connected to the signal transceiver module for use as an original oscillation signal, and the other of which is connected to the receiving module for use as a frequency-mixing down-conversion signal.
3. 3. The radar control device according to claim 2, wherein a first gain block is further provided between the voltage controlled oscillator and the first equalizer, and the first gain block is configured to amplify the oscillation signal.
4. 4. The radar control device according to claim 2 or 3, wherein the receiving module comprises a second equalizer, a mixer and a digital-to-analog converter, wherein the second equalizer is connected with the receiver module and is used for receiving the heart rate signal forwarded by the signal transceiver module and dividing the heart rate signal into two heart rate differential signals, the mixer is connected with the mixed down-conversion signal and the two heart rate differential signals and mixes the mixed down-conversion signal and the two heart rate differential signals, and the digital-to-analog converter is used for converting the analog heart rate signal output by the mixer into a digital signal.
5. 5. The radar control device according to claim 4, wherein the receiving module further comprises a second filter, an amplifier and a second gain block, which are sequentially connected, the second filter is configured to receive and filter the heart rate signal forwarded by the signal transceiver module, the amplifier is configured to amplify the heart rate signal, the second gain block is configured to further amplify the heart rate signal, and the second equalizer is configured to receive the heart rate signal amplified by the second gain block.
6. 6. The radar control device according to claim 5, wherein the second filter is a high-frequency filter, and the amplifier is a low-noise amplifier.
7. 7. The radar control device according to claim 5 or 6, wherein an operational amplifier is further arranged between the mixer and the digital-to-analog converter, the operational amplifier is used for amplifying two paths of heart rate differential signals, and a capacitor is further arranged between the mixer and the operational amplifier, and is used for isolating direct current signals.
8. 8. The radar control device according to claim 1, wherein the signal transceiver module comprises an antenna and a power divider connected to each other, and the power divider is configured to receive an oscillation signal from the transmitter module and forward an external heart rate signal to the receiver module.
9. 9. The radar control device according to claim 8, wherein a first filter is further provided between the antenna and the power divider, and the first filter is configured to filter.
10. 10. The radar control device of claim 9, wherein the first filter is a high pass filter.

Description

Radar control device suitable for non-contact heart rate measurement Technical Field The invention relates to the technical field of detection of magnetic resonance imaging and microwave radar intersection, in particular to a radar control device suitable for non-contact heart rate measurement. Background In the field of medical imaging, MRI lays a solid foundation for accurate diagnosis by virtue of no ionizing radiation hazard, excellent soft tissue resolving power and inherent advantages of multi-parameter multi-plane imaging. Among them, CMR imaging has established its gold standard in the field of cardiac imaging because it can accurately quantify cardiac function, noninvasively evaluate myocardial tissue properties (e.g., fibrosis, edema). However, during CMR imaging, dynamic interference generated by continuous periodic beating (contraction and relaxation) of the heart is prone to cause motion artifacts, which is a core technical difficulty in restricting the imaging quality of CMR. Such artifacts not only cause the display of the heart structure to be fuzzy and may mask the fine lesions, but also seriously affect the quantitative calculation accuracy of the heart function parameters, so that the reliability of the clinical diagnosis basis is reduced and the risk of misdiagnosis or missed diagnosis is indirectly increased. Gating signals are a key technical means to address the motion artifacts described above. In CMR imaging, the heart rate signal is used for generating a gating trigger signal, and images can be acquired at a specific stage of a cardiac cycle, so that imaging quality is improved. The current mainstream contact heart rate measurement method relies on Electrocardiogram (ECG) or photoplethysmography (PPG), but has the defect of being difficult to avoid. The ECG needs to be attached with electrodes on the body surface of a subject, the operation flow is complicated, skin discomfort is easy to cause, and more importantly, the ECG signal is more easily interfered by the magneto-hydrodynamic effect (MHD effect) under the environment of the MRI strong magnetic field, so that the measurement result is misaligned. The PPG signal depends on peripheral blood circulation detection, is influenced by signal delay and environmental electromagnetic interference, is easy to generate systematic trigger time sequence errors, and cannot meet the synchronous requirement of high-precision CMR imaging. Therefore, the non-contact heart rate measurement is a core direction for solving the pain point of the traditional contact scheme, which does not need body surface contact, so that not only can the discomfort of a subject be reduced and the operation flow be simplified, but also the interference problem of the contact measurement can be fundamentally avoided, and the possibility is provided for accurately acquiring the heart rate signal. The microstrip antenna is light and thin in structure, easy to integrate, and capable of adapting to the MRI strong magnetic field environment after magnetic compatibility design, and becomes an ideal carrier for non-contact heart rate signal detection. However, a special radar control device is not used for driving the microstrip antenna, and the noncontact detection capability and the magnetic compatibility of the microstrip antenna cannot be effectively combined, so that the microstrip antenna is applied to a CMR heart rate gating scene, and the requirements of clinic on high-precision and low-interference heart rate gating signals are difficult to meet. Therefore, there is a need to develop a radar control device that is adapted to a microstrip antenna and can stably operate in an MRI environment. Disclosure of Invention In order to solve the problems, the invention provides a radar control device suitable for non-contact heart rate measurement, which can capture micro Doppler signals of chest movements of a human body caused by heart beating and finally provide accurate heart rate triggering gating signals for heart magnetic resonance (CMR) imaging. The radar control device suitable for non-contact heart rate measurement comprises a shielding shell, wherein a circuit board is arranged in the shielding shell, a circuit is arranged in the circuit board, the circuit comprises a sending module, a signal receiving and sending module and a receiving module, the signal receiving and sending module is respectively connected with the sending module and the receiving module in series, the sending module is used for generating an oscillating signal and sending the oscillating signal to the signal receiving and sending module, the signal receiving and sending module is used for sending the oscillating signal outwards and forwarding the received external heart rate signal to the receiving module, and the receiving module is used for processing the heart rate signal. In a feasible real-time mode, the transmitting module comprises a voltage-controlled oscillator and a first balance d