A quasi-phase super-resolution circuit for respiratory motion signals on the chest and abdomen surface

Abstract

The present invention discloses a quasi-phase super-resolution circuit for respiratory motion signals on the surface of chest and abdomen, which belongs to the technical field of precision instruments and chest and abdomen radiotherapy. The circuit comprises a signal conversion module, a phase difference multi-output module, a resistor chain multi-phase generation module, a multi-phase sine square wave conversion module and a multi-phase fusion logic gate module. These modules are indispensable as a whole, and together realize the conversion of a respiratory motion signal of one cycle into a quasi-phase square wave signal of multiple cycles, and the phase difference is the zero cycle of the quasi-phase super-resolution square wave output signal. That is, super-resolution of respiratory motion signals on the surface of chest and abdomen is realized. The further technical advantage that this result can bring is that, during multiple respiratory cycles, the change of respiratory frequency can be judged by judging the frequency change of the square wave signal. More importantly, since the period of the super-resolution square wave is much smaller than the respiratory motion period, the change of respiratory frequency can be judged within a time range smaller than one respiratory cycle.

Description

Technical Field

[0001] The invention discloses a quasi-phase super-resolution circuit for respiratory motion signals on the surface of chest and abdomen, belonging to the technical field of precision instruments and chest and abdomen radiotherapy. Background Art

[0002] During radiotherapy for thoracic and abdominal tumors, breathing causes the tumor area to escape from the target area or normal tissue to enter the target area, which not only reduces the effect of radiotherapy but also easily causes complications.

[0003] In order to solve the negative impact of respiratory movement on radiotherapy, the earliest clinical methods used were breath holding and respiratory gating. The position of the tumor was controlled by intervening in the breathing. Although certain effects were achieved, the patient tolerance was poor. In order to improve the patient tolerance and not interfere with the patient's breathing, a tracking system was developed to track the position of the tumor by monitoring the tumor area. However, since this method belongs to a lag compensation method, there is always a problem of "half a beat slow". In order to improve the tracking accuracy, scholars used prediction methods. Initially, the respiratory movement was regarded as a simple repetition of a respiratory cycle. However, since the respiratory movement itself has a quasi-periodic characteristic without obvious rules, the prediction accuracy is not high, and the error will become larger and larger with the passage of time. Later, scholars formed a respiratory movement model with time as a variable through fitting according to the historical laws of respiratory movement, and then predicted future respiratory movement. This method has a good effect. Graduate students Fan Qi and Shi Ling of this research group used the Gaussian process regression method to predict respiratory movement, and gave the prediction results in the form of mean and variance, providing a new prediction method for respiratory movement.

[0004] The macroscopic characteristics of respiratory motion are determined by amplitude and frequency. Since there is a certain corresponding relationship between amplitude and frequency, it is only necessary to accurately obtain the respiratory frequency to realize the prediction of respiratory motion. However, for the prediction of respiratory frequency, at least one respiratory cycle must be collected, which brings certain difficulties to the rapid analysis of respiratory frequency. If the respiratory motion signal can be super-resolved, the respiratory frequency can be obtained in less than one respiratory motion cycle, and then the respiratory motion can be predicted and analyzed quickly. However, in this field, no technical means for super-resolving respiratory motion signals have been found. Summary of the invention

[0005] In order to achieve super-resolution of respiratory motion signals, the present invention discloses a quasi-phase super-resolution circuit and method for respiratory motion signals on the chest and abdomen surface, which can convert one-cycle respiratory motion signals into multiple-cycle quasi-phase square wave signals, and the phase difference is the zero cycle of the quasi-phase super-resolution square wave output signal; the further technical advantage that can be brought about by this result is that during multiple respiratory cycles, the change of respiratory frequency can be judged by judging the frequency change of the square wave signal, and more importantly, because the period of the super-resolution square wave is much smaller than the respiratory motion period, the change of respiratory frequency can be judged in a shorter time, that is, within a time range less than one respiratory cycle.

[0006] The object of the present invention is achieved in that:

[0007] A quasi-phase super-resolution circuit for chest and abdomen surface respiratory motion signals, comprising a signal conversion module, a phase difference multi-output module, a resistor chain multi-phase generation module, a multi-phase sine-square wave conversion module and a multi-phase fusion logic gate module;

[0008] The input of the signal conversion module is a respiratory motion signal f(t) of one cycle, and the output is:

[0009]

[0010] Where: t0 is the time when the respiratory motion signal f(t) starts to be collected; ω is the angular frequency of the respiratory motion signal f(t); T is the period of the respiratory motion signal f(t);

[0011] The phase difference multi-output module includes an operational amplifier U1-1 and an operational amplifier U1-2, the inverting input terminal of the operational amplifier U1-1 is connected to the output terminal of the signal conversion module through a capacitor C1-1, is connected to the output terminal of the operational amplifier U1-1 through a resistor R1-1, and the non-inverting input terminal of the operational amplifier U1-1 is connected to the ground; the inverting input terminal of the operational amplifier U1-2 is connected to the output terminal of the operational amplifier U1-1 through a capacitor C1-2, is connected to the output terminal of the operational amplifier U1-2 through a resistor R1-2, and the non-inverting input terminal of the operational amplifier U1-2 is connected to the ground; the output terminal of the signal conversion module serves as the first output of the phase difference multi-output module, the output terminal of the operational amplifier U1-1 serves as the second output of the phase difference multi-output module, and the output terminal of the operational amplifier U1-2 serves as the third output of the phase difference multi-output module;

[0012] The resistor chain multi-phase generation module includes 9 resistors; the first output of the phase difference multi-output module and the second output of the phase difference multi-output module are connected respectively through the series structure of resistor R2-3 and resistor R2-7, the resistance ratio of resistor R2-3 and resistor R2-7 is 8 / 11, and are connected through the series structure of resistor R2-5 and resistor R2-9, the resistance ratio of resistor R2-5 and resistor R2-9 is 28 / 9; the second output of the phase difference multi-output module and the third output of the phase difference multi-output module are connected respectively through the series structure of resistor R2-11 and resistor R2-15, the resistor R2-11 and resistor R The resistance ratio of resistor R2-2-15 is 9 / 28, and is connected through the series structure of resistor R2-13 and resistor R2-17, and the resistance ratio of resistor R2-13 and resistor R2-17 is 11 / 8; the first output of the phase difference multi-output module is used as the first phase output after passing through resistor R2-1, the tap between resistor R2-3 and resistor R2-7 is used as the third phase output, the tap between resistor R2-5 and resistor R2-9 is used as the fifth phase output, the tap between resistor R2-11 and resistor R2-15 is used as the seventh phase output, and the tap between resistor R2-13 and resistor R2-17 is used as the ninth phase output;

[0013] The multi-phase sine-to-square wave conversion module includes 5 operational amplifiers, the inverting input terminal of the operational amplifier U2-1 is connected to the first phase output of the resistor chain multi-phase generation module; the non-inverting input terminal of the operational amplifier U2-1 is connected to the ground, and the output terminal of the operational amplifier U2-1 is the first square wave output; the inverting input terminal of the operational amplifier U2-3 is connected to the third phase output of the resistor chain multi-phase generation module; the non-inverting input terminal of the operational amplifier U2-3 is connected to the ground, and the output terminal of the operational amplifier U2-3 is the third square wave output; the inverting input terminal of the operational amplifier U2-5 is connected to the third phase output of the resistor chain multi-phase generation module The fifth phase output of the block; the in-phase input terminal of the operational amplifier U2-5 is connected to the ground, and the output terminal of the operational amplifier U2-5 is the fifth square wave output; the inverting input terminal of the operational amplifier U2-7 is connected to the seventh phase output of the resistor chain multi-phase generation module; the in-phase input terminal of the operational amplifier U2-7 is connected to the ground, and the output terminal of the operational amplifier U2-7 is the seventh square wave output; the inverting input terminal of the operational amplifier U2-9 is connected to the ninth phase output of the resistor chain multi-phase generation module; the in-phase input terminal of the operational amplifier U2-9 is connected to the ground, and the output terminal of the operational amplifier U2-9 is the ninth square wave output;

[0014] The multi-phase fusion logic gate module includes 4 XOR gates, the input of XOR gate U3-1 is the third square wave output and the seventh square wave output, and the output of XOR gate U3-1 is the first XOR output; the input of XOR gate U3-3 is the first square wave output and the first XOR output, and the output of XOR gate U3-3 is the third XOR output; the input of XOR gate U3-6 is the third XOR output and the seventh XOR output, and the output of XOR gate U3-6 is the sixth XOR output; the input of XOR gate U3-7 is the fifth square wave output and the ninth square wave output, and the output of XOR gate U3-7 is the seventh XOR output; wherein the sixth XOR output is output as a quasi-phase super-resolution square wave.

[0015] The signal conversion module of the above-mentioned quasi-phase super-resolution circuit for respiratory motion signals on the chest and abdomen surface is realized by a filter and an amplifier whose passband frequency includes ω.

[0016] A quasi-phase super-resolution method for chest and abdomen surface respiratory motion signals comprises the following steps:

[0017] Step a: In the signal conversion module, a filter and an amplifier with a passband frequency including ω are used to realize the input of a periodic respiratory motion signal f(t), and the output is:

[0018]

[0019] in,

[0020] The filter selects the component with frequency ω to pass;

[0021] The amplifier adjusts the amplitude to

[0022] Step b, in the phase difference multi-output module, using two differential circuits composed of a resistor, a capacitor and an operational amplifier, respectively achieving one differentiation and two differentiations of the output cosine signal of the signal conversion module, thereby achieving three outputs of an arithmetic progression with a phase difference tolerance of π / 2;

[0023] Step c: In the resistor chain multi-phase generation module, for the convenience of analysis, the three outputs of the phase difference multi-output module are set to sinα, sin(α-π / 2) and sin(α-π) respectively;

[0024] Since the resistance ratio of the resistor R2-3 to the resistor R2-7 is 8 / 11, the tap voltage between the resistor R2-3 and the resistor R2-7 is:

[0025]

[0026] Since the resistance ratio of resistor R2-5 to resistor R2-9 is 28 / 9, the tap voltage between resistor R2-5 and resistor R2-9 is:

[0027]

[0028] Since the resistance ratio of resistor R2-11 to resistor R2-15 is 9 / 28, the tap voltage between resistor R2-11 and resistor R2-15 is:

[0029]

[0030] Since the resistance ratio of the resistor R2-13 to the resistor R2-17 is 11 / 8, the tap voltage between the resistor R2-13 and the resistor R2-17 is:

[0031]

[0032] It can be seen that the output of the resistor chain multi-phase generation module is an arithmetic progression of five outputs with a phase tolerance of π / 5;

[0033] Step d, in the multi-phase sine-to-square wave conversion module, each output of the resistor chain multi-phase generation module passes through a zero-crossing comparator, and the amplitude is adjusted to the saturation voltage value of the operational amplifier, and the phase is retained;

[0034] Step e, in the multi-phase fusion logic gate module, the five square wave outputs of the multi-phase sine-to-square wave conversion module and the three XOR outputs of the multi-phase fusion logic gate module are used for logical operation to realize quasi-phase super-resolution square wave output; the quasi-phase super-resolution square wave output converts one cycle of respiratory movement signal into a five-cycle square wave signal, and the phase difference is the zero cycle of the quasi-phase super-resolution square wave output signal.

[0035] Beneficial effects:

[0036] First, in the present invention, the signal conversion module, the phase difference multi-output module, the resistor chain multi-phase generation module, the multi-phase sine square wave conversion module and the multi-phase fusion logic gate module are as a whole, and none of them can be missing. Together, they realize the conversion of a respiratory motion signal of one cycle into a quasi-phase square wave signal of multiple cycles, and the phase difference is the zero cycle of the quasi-phase super-resolution square wave output signal; that is, super-resolution of the respiratory motion signal on the chest and abdomen surface is achieved. The further technical advantage that this result can bring is that during multiple respiratory cycles, the change in respiratory frequency can be determined by determining the frequency change of the square wave signal. More importantly, since the period of the super-resolution square wave is much smaller than the respiratory motion period, the change in respiratory frequency can be determined in a shorter time, that is, within a time range less than one respiratory cycle.

[0037] Second, to super-resolution the respiratory motion signals on the chest and abdomen surfaces, quasi-phase super-resolution and out-of-phase super-resolution can be performed first, and then the phase difference between the quasi-phase super-resolution signal and the out-of-phase super-resolution signal can be used for secondary super-resolution, so as to further improve the super-resolution accuracy and shorten the signal analysis time. Among them, obtaining quasi-phase super-resolution signals and out-of-phase super-resolution signals is an indispensable step. Compared with the other two patents applied for by the project team on the same day, "A Phase-Out-of-Phase Super-Resolution Circuit for Respiratory Motion Signals on the Chest and Abdomen" and "A Phase-Out-of-Phase Super-Resolution Method for Respiratory Motion Signals on the Chest and Abdomen", the present application realizes quasi-phase super-resolution of respiratory motion signals on the chest and abdomen surfaces by selecting special resistance parameters, that is, it realizes the conversion of one cycle of respiratory motion signals into multiple cycles of quasi-phase square wave signals, and the phase difference is the zero cycle of the quasi-phase super-resolution square wave output signal, laying the foundation for secondary super-resolution. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a logic block diagram of a quasi-phase super-resolution circuit for respiratory motion signals on the surface of chest and abdomen of the present invention.

[0039] Figure 2 It is a circuit diagram of a phase difference multi-output module in a quasi-phase super-resolution circuit for respiratory motion signals on the surface of chest and abdomen of the present invention.

[0040] Figure 3 It is a circuit diagram of a resistor chain multi-phase generation module in a quasi-phase super-resolution circuit for respiratory motion signals on the surface of chest and abdomen of the present invention.

[0041] Figure 4 It is a circuit diagram of a multi-phase sinusoidal square wave conversion module in a quasi-phase super-resolution circuit for respiratory motion signals on the surface of chest and abdomen of the present invention.

[0042] Figure 5 It is a circuit diagram of a multi-phase fusion logic gate module in a quasi-phase super-resolution circuit for respiratory motion signals on the surface of chest and abdomen of the present invention.

[0043] Figure 6 It is a waveform diagram output by each module of the quasi-phase super-resolution circuit of the chest and abdomen surface respiratory motion signal of the present invention. DETAILED DESCRIPTION

[0044] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings. Specific implementation method 1

[0046] This embodiment is an implementation of a quasi-phase super-resolution circuit for respiratory motion signals on the chest and abdomen surfaces.

[0047] Quasi-phase super-resolution circuit for respiratory motion signal on chest and abdomen surface, the logic block diagram is as follows Figure 1As shown, the quasi-phase super-resolution circuit of the chest and abdomen surface respiratory motion signal includes a signal conversion module, a phase difference multi-output module, a resistor chain multi-phase generation module, a multi-phase sine square wave conversion module and a multi-phase fusion logic gate module; wherein the circuit diagram of the phase difference multi-output module is as shown Figure 2 As shown, the circuit diagram of the resistor chain multi-phase generation module is as follows Figure 3 As shown, the circuit diagram of the multi-phase sine-to-square wave conversion module is as follows Figure 4 As shown, the circuit diagram of the multi-phase fusion logic gate module is as follows Figure 5 As shown, the output waveforms of each module of the chest and abdomen surface respiratory motion signal super-resolution circuit of the present invention are as follows Figure 6 As shown;

[0048] The input of the signal conversion module is a respiratory motion signal f(t) of one cycle, and the output is:

[0049]

[0050] Where: t0 is the time when the respiratory motion signal f(t) starts to be collected; ω is the angular frequency of the respiratory motion signal f(t); T is the period of the respiratory motion signal f(t);

[0051] The signal conversion module is implemented by a filter and an amplifier whose passband frequency includes ω;

[0052] The phase difference multi-output module includes an operational amplifier U1-1 and an operational amplifier U1-2, the inverting input terminal of the operational amplifier U1-1 is connected to the output terminal of the signal conversion module through a capacitor C1-1, is connected to the output terminal of the operational amplifier U1-1 through a resistor R1-1, and the non-inverting input terminal of the operational amplifier U1-1 is connected to the ground; the inverting input terminal of the operational amplifier U1-2 is connected to the output terminal of the operational amplifier U1-1 through a capacitor C1-2, is connected to the output terminal of the operational amplifier U1-2 through a resistor R1-2, and the non-inverting input terminal of the operational amplifier U1-2 is connected to the ground; the output terminal of the signal conversion module serves as the first output of the phase difference multi-output module, the output terminal of the operational amplifier U1-1 serves as the second output of the phase difference multi-output module, and the output terminal of the operational amplifier U1-2 serves as the third output of the phase difference multi-output module;

[0053] The resistor chain multi-phase generation module includes 9 resistors; the first output of the phase difference multi-output module and the second output of the phase difference multi-output module are connected respectively through the series structure of resistor R2-3 and resistor R2-7, the resistance ratio of resistor R2-3 and resistor R2-7 is 8 / 11, and are connected through the series structure of resistor R2-5 and resistor R2-9, the resistance ratio of resistor R2-5 and resistor R2-9 is 28 / 9; the second output of the phase difference multi-output module and the third output of the phase difference multi-output module are connected respectively through the series structure of resistor R2-11 and resistor R2-15, the resistor R2-11 and resistor R The resistance ratio of resistor R2-2-15 is 9 / 28, and is connected through the series structure of resistor R2-13 and resistor R2-17, and the resistance ratio of resistor R2-13 and resistor R2-17 is 11 / 8; the first output of the phase difference multi-output module is used as the first phase output after passing through resistor R2-1, the tap between resistor R2-3 and resistor R2-7 is used as the third phase output, the tap between resistor R2-5 and resistor R2-9 is used as the fifth phase output, the tap between resistor R2-11 and resistor R2-15 is used as the seventh phase output, and the tap between resistor R2-13 and resistor R2-17 is used as the ninth phase output;

[0054] The multi-phase sine-to-square wave conversion module includes 5 operational amplifiers, the inverting input terminal of the operational amplifier U2-1 is connected to the first phase output of the resistor chain multi-phase generation module; the non-inverting input terminal of the operational amplifier U2-1 is connected to the ground, and the output terminal of the operational amplifier U2-1 is the first square wave output; the inverting input terminal of the operational amplifier U2-3 is connected to the third phase output of the resistor chain multi-phase generation module; the non-inverting input terminal of the operational amplifier U2-3 is connected to the ground, and the output terminal of the operational amplifier U2-3 is the third square wave output; the inverting input terminal of the operational amplifier U2-5 is connected to the third phase output of the resistor chain multi-phase generation module The fifth phase output of the block; the in-phase input terminal of the operational amplifier U2-5 is connected to the ground, and the output terminal of the operational amplifier U2-5 is the fifth square wave output; the inverting input terminal of the operational amplifier U2-7 is connected to the seventh phase output of the resistor chain multi-phase generation module; the in-phase input terminal of the operational amplifier U2-7 is connected to the ground, and the output terminal of the operational amplifier U2-7 is the seventh square wave output; the inverting input terminal of the operational amplifier U2-9 is connected to the ninth phase output of the resistor chain multi-phase generation module; the in-phase input terminal of the operational amplifier U2-9 is connected to the ground, and the output terminal of the operational amplifier U2-9 is the ninth square wave output;

[0055] The multi-phase fusion logic gate module includes 4 XOR gates, the input of XOR gate U3-1 is the third square wave output and the seventh square wave output, and the output of XOR gate U3-1 is the first XOR output; the input of XOR gate U3-3 is the first square wave output and the first XOR output, and the output of XOR gate U3-3 is the third XOR output; the input of XOR gate U3-6 is the third XOR output and the seventh XOR output, and the output of XOR gate U3-6 is the sixth XOR output; the input of XOR gate U3-7 is the fifth square wave output and the ninth square wave output, and the output of XOR gate U3-7 is the seventh XOR output; wherein the sixth XOR output is output as a quasi-phase super-resolution square wave. Specific implementation method 2

[0057] This embodiment is an implementation method of a quasi-phase super-resolution method for respiratory motion signals on the chest and abdomen surfaces.

[0058] The method for quasi-phase super-resolution of respiratory motion signals on the chest and abdomen surface is characterized by comprising the following steps:

[0059] Step a: In the signal conversion module, a filter and an amplifier with a passband frequency including ω are used to realize the input of a periodic respiratory motion signal f(t), and the output is:

[0060]

[0061] in,

[0062] The filter selects the component with frequency ω to pass;

[0063] The amplifier adjusts the amplitude to

[0064] Step b, in the phase difference multi-output module, using two differential circuits composed of a resistor, a capacitor and an operational amplifier, respectively achieving one differentiation and two differentiations of the output cosine signal of the signal conversion module, thereby achieving three outputs of an arithmetic progression with a phase difference tolerance of π / 2;

[0065] Step c: In the resistor chain multi-phase generation module, for the convenience of analysis, the three outputs of the phase difference multi-output module are set to sinα, sin(α-π / 2) and sin(α-π) respectively;

[0066] Since the resistance ratio of the resistor R2-3 to the resistor R2-7 is 8 / 11, the tap voltage between the resistor R2-3 and the resistor R2-7 is:

[0067]

[0068] Since the resistance ratio of resistor R2-5 to resistor R2-9 is 28 / 9, the tap voltage between resistor R2-5 and resistor R2-9 is:

[0069]

[0070] Since the resistance ratio of the resistor R2-11 to the resistor R2-15 is 9 / 28, the tap voltage between the resistor R2-11 and the resistor R2-15 is:

[0071]

[0072] Since the resistance ratio of the resistor R2-13 to the resistor R2-17 is 11 / 8, the tap voltage between the resistor R2-13 and the resistor R2-17 is:

[0073]

[0074] It can be seen that the output of the resistor chain multi-phase generation module is an arithmetic progression of five outputs with a phase tolerance of π / 5;

[0075] Step d, in the multi-phase sine-to-square wave conversion module, each output of the resistor chain multi-phase generation module passes through a zero-crossing comparator, and the amplitude is adjusted to the saturation voltage value of the operational amplifier, and the phase is retained;

[0076] Step e, in the multi-phase fusion logic gate module, the five square wave outputs of the multi-phase sine-to-square wave conversion module and the three XOR outputs of the multi-phase fusion logic gate module are used for logical operation to realize quasi-phase super-resolution square wave output; the quasi-phase super-resolution square wave output converts one cycle of respiratory movement signal into a five-cycle square wave signal, and the phase difference is the zero cycle of the quasi-phase super-resolution square wave output signal.

Claims

1. A quasi-phase super-resolution circuit for respiratory motion signals on the chest and abdomen surface, characterized in that: It includes a signal conversion module, a phase difference multi-output module, a resistor chain multi-phase generation module, a multi-phase sine-square wave conversion module and a multi-phase fusion logic gate module; The input of the signal conversion module is a respiratory motion signal f(t) of one cycle, and the output is: Where: t0 is the time when the respiratory motion signal f(t) starts to be collected; ω is the angular frequency of the respiratory motion signal f(t); T is the period of the respiratory motion signal f(t); The phase difference multi-output module includes an operational amplifier U1-1 and an operational amplifier U1-2, the inverting input terminal of the operational amplifier U1-1 is connected to the output terminal of the signal conversion module through a capacitor C1-1, is connected to the output terminal of the operational amplifier U1-1 through a resistor R1-1, and the non-inverting input terminal of the operational amplifier U1-1 is connected to the ground; the inverting input terminal of the operational amplifier U1-2 is connected to the output terminal of the operational amplifier U1-1 through a capacitor C1-2, is connected to the output terminal of the operational amplifier U1-2 through a resistor R1-2, and the non-inverting input terminal of the operational amplifier U1-2 is connected to the ground; the output terminal of the signal conversion module serves as the first output of the phase difference multi-output module, the output terminal of the operational amplifier U1-1 serves as the second output of the phase difference multi-output module, and the output terminal of the operational amplifier U1-2 serves as the third output of the phase difference multi-output module; The resistor chain multi-phase generation module includes 9 resistors; the first output of the phase difference multi-output module and the second output of the phase difference multi-output module are connected respectively through the series structure of resistor R2-3 and resistor R2-7, the resistance ratio of resistor R2-3 and resistor R2-7 is 8 / 11, and are connected through the series structure of resistor R2-5 and resistor R2-9, the resistance ratio of resistor R2-5 and resistor R2-9 is 28 / 9; the second output of the phase difference multi-output module and the third output of the phase difference multi-output module are connected respectively through the series structure of resistor R2-11 and resistor R2-15, the resistor R2-11 and resistor R The resistance ratio of resistor R2-2-15 is 9 / 28, and is connected through the series structure of resistor R2-13 and resistor R2-17, and the resistance ratio of resistor R2-13 and resistor R2-17 is 11 / 8; the first output of the phase difference multi-output module is used as the first phase output after passing through resistor R2-1, the tap between resistor R2-3 and resistor R2-7 is used as the third phase output, the tap between resistor R2-5 and resistor R2-9 is used as the fifth phase output, the tap between resistor R2-11 and resistor R2-15 is used as the seventh phase output, and the tap between resistor R2-13 and resistor R2-17 is used as the ninth phase output; The multi-phase sine-to-square wave conversion module includes 5 operational amplifiers, the inverting input terminal of the operational amplifier U2-1 is connected to the first phase output of the resistor chain multi-phase generation module; the non-inverting input terminal of the operational amplifier U2-1 is connected to the ground, and the output terminal of the operational amplifier U2-1 is the first square wave output; the inverting input terminal of the operational amplifier U2-3 is connected to the third phase output of the resistor chain multi-phase generation module; the non-inverting input terminal of the operational amplifier U2-3 is connected to the ground, and the output terminal of the operational amplifier U2-3 is the third square wave output; the inverting input terminal of the operational amplifier U2-5 is connected to the third phase output of the resistor chain multi-phase generation module The fifth phase output of the block; the in-phase input terminal of the operational amplifier U2-5 is connected to the ground, and the output terminal of the operational amplifier U2-5 is the fifth square wave output; the inverting input terminal of the operational amplifier U2-7 is connected to the seventh phase output of the resistor chain multi-phase generation module; the in-phase input terminal of the operational amplifier U2-7 is connected to the ground, and the output terminal of the operational amplifier U2-7 is the seventh square wave output; the inverting input terminal of the operational amplifier U2-9 is connected to the ninth phase output of the resistor chain multi-phase generation module; the in-phase input terminal of the operational amplifier U2-9 is connected to the ground, and the output terminal of the operational amplifier U2-9 is the ninth square wave output; The multi-phase fusion logic gate module includes 4 XOR gates, the input of XOR gate U3-1 is the third square wave output and the seventh square wave output, and the output of XOR gate U3-1 is the first XOR output; the input of XOR gate U3-3 is the first square wave output and the first XOR output, and the output of XOR gate U3-3 is the third XOR output; the input of XOR gate U3-6 is the third XOR output and the seventh XOR output, and the output of XOR gate U3-6 is the sixth XOR output; the input of XOR gate U3-7 is the fifth square wave output and the ninth square wave output, and the output of XOR gate U3-7 is the seventh XOR output; wherein the sixth XOR output is output as a quasi-phase super-resolution square wave.

2. A quasi-phase super-resolution circuit for chest and abdomen surface respiratory motion signals according to claim 1, characterized in that: The signal conversion module is implemented by a filter and an amplifier whose passband frequency includes ω.

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