A calibration compensation method for customized antenna headgear and postoperative detection system

Abstract

The present application discloses a calibration and compensation method for a customized antenna headgear and a postoperative detection system, which relate to the field of data processing technology, wherein the method comprises: obtaining a three-dimensional model of an ideal customized antenna headgear based on a three-dimensional model of the patient's head, and then obtaining a physical customized antenna headgear. Scanning the physical customized antenna headgear, obtaining the position error of each antenna array element of the physical customized antenna headgear, and establishing a three-dimensional model of the physical customized antenna headgear. By solving the radiation characteristics of the physical customized antenna headgear, obtaining the difference between the radiation characteristics of the physical customized antenna headgear and the ideal radiation characteristics of the ideal customized antenna headgear, performing an inverse operation on the difference to generate a calibration matrix, and using the calibration matrix to calibrate the actual radiation characteristics. The present application proposes a morphologically variable customized antenna headgear and a calibration and compensation method for the customized antenna headgear, so that the adaptability of the patient's postoperative head condition is improved, and the accuracy of the data collected by the customized antenna headgear is improved.

Description

Technical Field

[0001] The present application relates to the field of data processing technology, and in particular to a calibration compensation method for a customized antenna headgear and a postoperative detection system. Background Art

[0002] After a craniotomy due to trauma, tumor, stroke, etc., there is usually a certain danger period, and the patient often needs to be monitored for vital signs in the intensive care unit. However, it is difficult to directly monitor the craniotomy lesion with commonly used monitoring methods. Commonly used brain detection methods include MRI, CT, cerebral angiography, etc., all of which require the patient to move and are one-time tests. The detection cost is high, and there may even be radiation damage or the detection is not suitable due to the presence of drainage tubes, surgical auxiliary materials, etc.

[0003] Due to individual differences among patients, it is difficult to accurately determine the patient's recovery process through indirect bedside test data such as ECG, respiration, and brain waves. Especially for life-threatening situations such as secondary cerebral hemorrhage after surgery, the indirect data response is delayed, delaying rescue efforts. Indirect, non-bedside real-time monitoring of the brain recovery process causes patients to stay in the ICU for a long time, resulting in high costs and excessive occupation of priority ICU resources.

[0004] In the experiment, it was found that electromagnetic wave brain imaging equipment, such as products of Medfield and other companies, can use harmless low-frequency microwaves to quickly perform brain imaging. However, the imaging resolution is low and cannot support bedside detection of brain diseases. In addition, this type of equipment requires the patient to put his head deep into the device detector, which makes operation difficult when there is a catheter in the patient's brain after surgery. Summary of the invention

[0005] In view of the above situation, the embodiments of the present application propose a calibration compensation method for a customized antenna headgear and a postoperative detection system to overcome or at least partially overcome the shortcomings of the prior art.

[0006] The present application discloses a calibration compensation method for a customized antenna headgear, the method comprising:

[0007] Step S1, obtaining an ideal customized antenna headgear three-dimensional model based on the three-dimensional model of the patient's head;

[0008] Step S2, manufacturing the patient's customized antenna headgear based on the ideal customized antenna headgear three-dimensional model, and obtaining a physical customized antenna headgear;

[0009] Step S3, scanning the physical customized antenna headgear, obtaining the position error of each antenna array element of the physical customized antenna headgear, and establishing a three-dimensional model of the physical customized antenna headgear based on the position error of the antenna array element;

[0010] Step S4, inputting the physical customized antenna headgear three-dimensional model into the radio frequency simulation software to solve the radiation characteristics of the physical customized antenna headgear;

[0011] Step S5, obtaining the difference between the radiation characteristic of the physical customized antenna headgear and the ideal radiation characteristic of the ideal customized antenna headgear, and performing an inverse operation on the difference to generate a calibration matrix;

[0012] Step S6, installing the physical customized antenna headgear on the patient's head, scanning different positions of the patient's head to obtain actual radiation characteristics of the physical customized antenna headgear, and calibrating the actual radiation characteristics using the calibration matrix.

[0013] In one embodiment, step S1 further comprises:

[0014] Step S11, obtaining a three-dimensional model of the patient's head;

[0015] Step S12, marking the medical instruments or bleeding or surgical sites that need to be avoided in the three-dimensional model of the patient's head, and selecting the model and quantity of the adapted antenna array elements and the installation position of each antenna array element on the patient's head;

[0016] S13, based on the selected antenna array elements and the installation positions of the antenna array elements on the patient's head, an ideal customized antenna headgear three-dimensional model is obtained.

[0017] In one embodiment, the antenna array element includes a strap and at least one antenna mounted on the strap, the strap has a connector, and the antenna array element has a two-dimensional pattern code, and the two-dimensional pattern code is used to obtain a serial number of the antenna array element.

[0018] In one embodiment, the antenna array element includes at least one of a single antenna array element, an eccentric array element, and a multi-eccentric array element. Each antenna array element has a unique serial number, radiation characteristics, and marking errors, and is stored and recorded in a database. The serial number is used to retrieve the radiation characteristics and marking errors of the antenna array element.

[0019] In one embodiment, the RF simulation software is RF full-band finite element simulation software HFSS or CST application library.

[0020] In one embodiment, the position error is the difference between a preset position of the antenna element and an actual position of the antenna element, the preset position is the installation position of each antenna element in the ideal customized antenna headgear three-dimensional model on the patient's head, and the actual position is the position of each antenna element in the physical customized antenna headgear obtained by scanning the physical customized antenna headgear on the patient's head.

[0021] In one embodiment, step S12 further includes: obtaining a stereoscopic image of the medical device by means of a multi-eye camera and measuring the size of the medical device and marking the actual position of the medical device, and selecting a suitable antenna array element, where the antenna array element is selected from an antenna array element database provided by the manufacturer.

[0022] In one embodiment, the patient's head is scanned by a multi-camera or a laser radar, and the size of the patient's head is marked using a recognition algorithm to obtain a three-dimensional model of the patient's head.

[0023] In one embodiment, the three-dimensional model of the ideal customized antenna headgear is input into radio frequency simulation software to solve the radiation characteristics of the ideal customized antenna headgear.

[0024] The present application also discloses a postoperative detection system, including a customized antenna headgear and an antenna correction module, wherein the correction module uses the calibration compensation method as described above to calibrate the customized antenna headgear.

[0025] At least one of the above technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects:

[0026] This invention is designed to propose a calibration compensation method for a customized antenna headgear and a postoperative detection system for postoperative patients who have difficulty moving in a intensive care bed. In view of the specificity of the patient's head size and the special circumstances such as the head with a drainage tube after surgery, a morphologically variable customized antenna headgear and a calibration compensation method for the customized antenna headgear are proposed, so that the adaptability of the patient's head condition is improved and the accuracy of the data collected by the customized antenna headgear is improved. By combining hardware and software, the patient's postoperative brain state can be monitored in real time, the recovery process can be predicted, and the brain state deterioration alarm can be alarmed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0028] Figure 1 The figure is a flow chart of the calibration compensation method applied to the customized antenna headgear.

[0029] Figure 2 This is a schematic diagram of the structure of a customized antenna headgear according to an embodiment of the present application.

[0030] Figure 3 This is a schematic diagram of the antenna array element structure of an embodiment of the present application (I).

[0031] Figure 4 This is a schematic diagram of the antenna array element structure of an embodiment of the present application (II).

[0032] The accompanying drawings are denoted as follows:

[0033] Antenna array element 100 , strap 10 , antenna 20 , two-dimensional pattern code 30 , connector 40 . DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0035] The calibration compensation method for customized antenna headgear provided in this application can be applied to a non-invasive brain imaging system and a postoperative detection system that can be monitored at the bedside around the clock. The calibration compensation method and the brain imaging system and the postoperative detection system that use the calibration compensation method can be applied to scenarios where postoperative patients have difficulty moving in a intensive care bed. Specifically: In view of the specificity of the patient's head size and the special circumstances such as the head with a drainage tube after surgery, a morphologically variable and customizable antenna array element is proposed to improve the patient's adaptability. By combining hardware and software, the patient's postoperative brain state can be monitored in real time, the recovery process can be predicted, and the alarm for brain state deterioration can be made.

[0036] The postoperative detection system of the present application is composed of a customized antenna headgear, a multi-camera or laser radar, an antenna correction module, a signal acquisition module, an imaging analysis and data storage module, and an information display human-computer interface. The customized antenna headgear can be designed with an antenna structure that matches the patient's postoperative head condition, avoiding catheters and other monitoring or life support interfaces.

[0037] Due to the complexity of the postoperative head condition, such as special cases where the head is attached with a drainage tube after surgery, the existing antenna headgear of uniform specifications cannot be used. Under the limitation of customized size, the placement of the antenna array elements must be compromised.

[0038] The antenna headgear of the present application is composed of a combination of prefabricated antenna modules, each module comprising a flexible adhesive strap, an antenna, an antenna cable connector and other parts. The strap is flexible and bendable, and there are densely printed dots and block patterns on the front and back of the flexible strap, such as a QR code pattern, which can be captured by a camera or a lidar. By interpreting the pattern, the position of the antenna array element (three-dimensional position size calibration) and the serial number of the antenna array element can be obtained at the same time. The serial number can be used to retrieve data such as the radiation characteristics of the antenna array element retained during pre-manufacturing, providing input for the subsequent antenna system compensation algorithm.

[0039] The separate module design of the present application also facilitates patients to wear customized headgear. After the antenna elements are assembled, the three-dimensional position and size calibration can be performed based on the two-dimensional pattern coding on the strap, and the factory performance calibration information of multiple antenna elements can be obtained at the same time.

[0040] Compared with prefabricated antenna arrays, there are two main errors that affect the performance of on-site customizable antenna array elements: 1. Antenna array element position error; 2. Antenna array element production error. If these two errors are not effectively corrected, the performance of the antenna array will be greatly reduced or even lose its function. To solve the above problems, this application proposes a calibration compensation method for custom antenna headgear, which specifically includes:

[0041] Step S1, obtaining an ideal customized antenna headgear three-dimensional model based on the three-dimensional model of the patient's head.

[0042] The step S1 further comprises:

[0043] S11, obtaining a three-dimensional model of the patient's head.

[0044] Specifically: the patient's head is scanned by a camera, and the patient's head size is marked using a recognition algorithm to obtain a three-dimensional model of the patient's head.

[0045] S12, step S12, marking the medical instruments or bleeding or surgical sites that need to be avoided in the three-dimensional model of the patient's head, and selecting the appropriate antenna element model, quantity and installation position of each antenna element on the patient's head.

[0046] Specifically: mark the medical instruments that need to be avoided in the 3D model of the patient's head. Doctors usually mark the types, quantity and positions of the medical devices used. Use a multi-eye camera to obtain stereo images of the medical devices, measure the sizes of the medical devices and mark the actual positions of the medical devices. Select appropriate antenna array elements, which can be selected from the antenna array element database provided by the manufacturer.

[0047] S13, based on the selected antenna array elements and the installation positions of the antenna array elements on the patient's head, an ideal customized antenna headgear three-dimensional model is obtained.

[0048] This application combines the acquired head size and medical device type and size to provide antenna array element model selection and assembly suggestions through an algorithm, and provides assembly instruction documents or video instructions.

[0049] The three-dimensional model of the ideal customized antenna headgear is input into the RF simulation software to solve the radiation characteristics of the ideal customized antenna headgear.

[0050] S2, making the patient's customized antenna headgear based on the ideal customized antenna headgear three-dimensional model, and obtaining the actual customized antenna headgear.

[0051] According to the installation positions of the antenna elements in the ideal customized antenna headgear three-dimensional model on the patient's head and the models of the antenna elements used, the antenna elements are connected in sequence according to the positions to obtain a physical customized antenna headgear. The physical customized antenna headgear is a manually assembled customized antenna headgear, which is worn on the patient's head through adaptive adjustment.

[0052] Since there are many types of antenna elements, and each antenna element needs to work in a wide frequency band, even the radiation characteristics of the same type of antenna elements are not exactly the same, so the antenna elements need to be calibrated before leaving the factory. Therefore, the antenna elements need to be calibrated before leaving the factory to obtain the marked error. Each antenna element has a unique serial number, radiation characteristics, and marked error, which are stored and recorded in the database.

[0053] like Figure 2-4 As shown, Figure 2 This is a schematic diagram of the structure of a customized antenna headgear according to an embodiment of the present application. Figure 3 This is a schematic diagram of the antenna array element structure of an embodiment of the present application (I), Figure 4 This is a schematic diagram of the antenna array element structure of an embodiment of the present application (II). The antenna customized headgear of the present application is annular, and is formed by connecting multiple different antenna array elements at equal distances. The antenna array element 100 includes a strap 10 and at least one antenna 20 installed on the strap 10. The strap 10 has a connector 40, such as a Velcro, and the straps 10 are connected to each other. The strap is flexible and bendable. The front and back of the strap are two-dimensional pattern codes 30. The two-dimensional pattern code 30 is a dot matrix or block pattern. The two-dimensional pattern code on the strap marks the coordinate position of the strap, and the two-dimensional pattern code on the antenna marks the coordinate position of the antenna. The serial number can be obtained by scanning the two-dimensional pattern code, and the radiation characteristic data and marking error corresponding to the serial number are retrieved from the database according to the serial number.

[0054] In addition, the two-dimensional pattern code is composed of several bits, such as an 8-bit pattern, and the repeated two-dimensional pattern code is used as a basic bit unit. The spread spectrum pattern ensures the sufficiency of the position information and can encode a certain length of serial number by interleaving multiple patterns. When leaving the factory, the model and measurement information of the antenna array element can be stored in the database through the serial number index.

[0055] Reference Figure 3 , Figure 4 The antenna array element includes at least one of a single antenna array element, an eccentric array element, and a multi-eccentric array element. Due to the complexity of the patient's head condition, for example, the presence of a medical device, in order to avoid the medical device, the shape of the antenna array element needs to be customized, and the shape of the strap is adapted to the medical device to be avoided, such as Figure 4As shown, the strap is designed to be in a circular shape to avoid medical equipment. The strap can be designed in different shapes, which are not limited here. The shape of the strap is designed to facilitate the patient's existing treatment or detection equipment in that part. Some straps are equipped with multiple antennas to improve accuracy, thereby reducing the size of a single antenna and obtaining better eccentric electromagnetic radiation characteristics. The radiation characteristics of the antenna array element are related to the coordinate position of the antenna and the coordinate position of the strap. Therefore, if the coordinate position of the strap (shape changes), the coordinate position of the antenna, and the number of antennas change, the radiation characteristics of the antenna array element will be different, that is, each antenna array element used in this application has corresponding radiation characteristics.

[0056] S3, scanning the physical customized antenna headgear, obtaining the position error of each antenna array element of the physical customized antenna headgear, and establishing a three-dimensional model of the physical customized antenna headgear based on the position error of the antenna array element.

[0057] Because it is difficult to avoid errors when medical staff paste antenna elements during assembly, the installation positions of each antenna element in the patient's head will be slightly offset compared to the ideal customized antenna headgear three-dimensional model. After assembly is completed, the physical customized antenna headgear is scanned to obtain the position error of each antenna element in the physical customized antenna headgear. The position error is the difference between the preset position of the antenna element and the actual position of the antenna element. The preset position is the installation position of each antenna element in the ideal customized antenna headgear three-dimensional model in the patient's head, and the actual position is the position of each antenna element in the physical customized antenna headgear obtained by scanning the physical customized antenna headgear in the patient's head.

[0058] S4, input the physical customized antenna headgear 3D model into the RF simulation software to solve the actual radiation characteristics of each antenna array element.

[0059] Combined with the position error of the antenna array element obtained in the previous step, a physical customized antenna headgear three-dimensional model for the patient is jointly generated. The ideal / physical customized antenna headgear three-dimensional model is composed of the antenna array element type, antenna array element position, and antenna array element unit radiation characteristics. By calling RF simulation software such as RF full-band finite element simulation software HFSS or CST application library, the radiation characteristics of the antenna array element of the physical customized antenna headgear can be simulated to obtain the radiation characteristics of the physical customized antenna headgear. The radiation characteristics of the physical customized antenna headgear are the mutual scattering parameter matrix between antenna array elements.

[0060] Step S5, obtaining the difference between the radiation characteristics of the actual customized antenna headgear and the ideal radiation characteristics of the ideal customized antenna headgear, and performing an inverse operation on the difference to generate a calibration matrix.

[0061] The ideal radiation characteristics refer to the radiation characteristics of each antenna array element obtained by inputting the ideal customized antenna headgear three-dimensional model into the RF simulation software.

[0062] In the present application, the radiation characteristics of the physical customized antenna headgear are not obtained by scanning the patient's head, but are the radiation characteristics of the physical customized antenna headgear itself.

[0063] Step S6, installing the physical customized antenna headgear on the patient's head, scanning different positions of the patient's head to obtain actual radiation characteristics of the physical customized antenna headgear, and calibrating the actual radiation characteristics using the calibration matrix.

[0064] The difference between the radiation characteristics of the physical customized antenna headgear and the radiation characteristics of the ideal customized antenna headgear three-dimensional model can generate a calibration matrix through pseudo-variation operation, and the actual radiation characteristics are calibrated using the calibration matrix, specifically by physically implementing the attenuation / delay / signal coupling of each antenna array element signal or by digital signal processing through an algorithm. Thus, each customized antenna headgear can obtain the same bleeding analysis results after calibration.

[0065] The physical customized antenna headgear is installed on the patient's head. The antennas A1, A2...An of the physical customized antenna headgear transmit electromagnetic waves at antenna A1 and receive echoes at A2, A3...An. The delay, echo, and attenuation information of the electromagnetic signal on the relative path will be recorded. This process calls A1...An as transmitting antennas in time or frequency division, and the remaining antennas as receiving antennas, so as to scan different head positions of the patient and obtain the actual radiation characteristics of the physical customized antenna headgear. According to different calling methods, a single antenna can transmit in time, or multiple antennas can transmit simultaneously at different orthogonal frequencies. Traversing the antenna combination according to the preset first-launch mode is a scanning cycle.

[0066] After the custom antenna headgear is assembled, the position and factory performance calibration information of each antenna array element are further determined by camera or laser scanning. The RF characteristics of the custom headgear installation are estimated through the data stored in the database, and the errors in the installation are recorded. The specific RF correction matrix of the custom headgear matching the patient is generated through RF characteristic calculation.

[0067] Connect all cables of multiple antennas and multiple sub-antennas to the antenna calibration hardware module. The antenna calibration hardware module calibrates the system's RF correction matrix by delaying, phase delaying, amplifying, attenuating, and coupling the signals on each antenna cable. After calibration, it still outputs the same number of RF cables to the signal acquisition module. From the signal acquisition module's perspective, the antenna cables calibrated by the antenna hardware module are equivalent to the ideal assumed antenna array, thereby binding the antenna signal to the three-dimensional position of the patient's head.

[0068] The embodiment of the present application also proposes a postoperative detection system, including a customized antenna headgear and an antenna correction module, wherein the correction module uses the above-mentioned calibration compensation method to calibrate the customized antenna headgear.

[0069] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A calibration compensation method for a customized antenna headgear, characterized in that: The method comprises: Step S1, obtaining an ideal customized antenna headgear three-dimensional model based on the three-dimensional model of the patient's head; Step S2, manufacturing the patient's customized antenna headgear based on the ideal customized antenna headgear three-dimensional model, and obtaining a physical customized antenna headgear; Step S3, scanning the physical customized antenna headgear, obtaining the position error of each antenna array element of the physical customized antenna headgear, and establishing a three-dimensional model of the physical customized antenna headgear based on the position error of the antenna array element; Step S4, inputting the physical customized antenna headgear three-dimensional model into the radio frequency simulation software to solve the radiation characteristics of the physical customized antenna headgear; Step S5, obtaining the difference between the radiation characteristic of the physical customized antenna headgear and the ideal radiation characteristic of the ideal customized antenna headgear, and performing an inverse operation on the difference to generate a calibration matrix; Step S6, installing the physical customized antenna headgear on the patient's head, scanning different positions of the patient's head to obtain actual radiation characteristics of the physical customized antenna headgear, and calibrating the actual radiation characteristics using the calibration matrix.

2. The calibration compensation method according to claim 1, characterized in that: Step S1 further comprises: Step S11, obtaining a three-dimensional model of the patient's head; Step S12, marking the medical instruments or bleeding or surgical sites that need to be avoided in the three-dimensional model of the patient's head, and selecting the model and quantity of the adapted antenna array elements and the installation position of each antenna array element on the patient's head; S13, based on the selected antenna array elements and the installation positions of the antenna array elements on the patient's head, an ideal customized antenna headgear three-dimensional model is obtained.

3. The calibration compensation method according to claim 2, characterized in that: The antenna array element comprises a strap and at least one antenna mounted on the strap, the strap is provided with a connector, and the antenna array element has a two-dimensional pattern code, and the two-dimensional pattern code is used to obtain a serial number of the antenna array element.

4. The calibration compensation method according to claim 3, characterized in that: The antenna array element includes at least one of a single antenna array element, an eccentric array element, and a multi-eccentric array element. Each antenna array element has a unique serial number, radiation characteristics, and marking errors, and is stored and recorded in a database. The serial number is used to retrieve the radiation characteristics and marking errors of the antenna array element.

5. The calibration compensation method according to claim 2, characterized in that: The radio frequency simulation software is the radio frequency full-band finite element simulation software HFSS or CST application library.

6. The calibration compensation method according to claim 1, characterized in that: The position error is the difference between the preset position of the antenna element and the actual position of the antenna element. The preset position is the installation position of each antenna element in the ideal customized antenna headgear three-dimensional model on the patient's head, and the actual position is the position of each antenna element in the physical customized antenna headgear obtained by scanning the physical customized antenna headgear on the patient's head.

7. The calibration compensation method according to claim 2, characterized in that: Step S12 further includes: using a multi-camera to obtain a stereoscopic image of the medical device and measure the size of the medical device and mark the actual position of the medical device, and selecting a suitable antenna array element, where the antenna array element is selected from an antenna array element database provided by the manufacturer.

8. The calibration compensation method according to claim 2, characterized in that: The patient's head is scanned by a camera, and the patient's head size is marked using a recognition algorithm to obtain a three-dimensional model of the patient's head.

9. The calibration compensation method according to claim 1, characterized in that: The three-dimensional model of the ideal customized antenna headgear is input into the RF simulation software to solve the radiation characteristics of the ideal customized antenna headgear.

10. A postoperative detection system, characterized in that: It comprises a customized antenna head cover and an antenna correction module, wherein the correction module uses the calibration compensation method as described in any one of claims 1 to 5 to correct the customized antenna head cover.

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