Electrical impedance imaging method, apparatus, storage medium, and electronic device

Abstract

The application provides a kind of electrical impedance imaging method, device, storage medium and electronic equipment, it is related to electrical impedance imaging technical field, the method is applied to electrical impedance imaging system, the electrical impedance imaging system includes multiple electrodes arranged in the region to be measured, the method comprises: when detecting that there is disabled electrode in the multiple electrodes, the electrode grouping interval of pre-set is used to group the electrode except the disabled electrode in the multiple electrodes, obtain first electrode group set;The first electrode group set is used as first excitation electrode group;The first electrode group set is used as first measurement electrode group;Based on the first excitation electrode group and the first measurement electrode group, the region to be measured is electrically impedance imaged.The technical scheme provided by the application can still obtain more accurate electrical impedance imaging results in the presence of disabled electrode.

Description

Technical Field

[0001] This invention relates to the field of electrical impedance imaging technology, and particularly to an electrical impedance imaging method, apparatus, storage medium, and electronic device. Background Technology

[0002] Electrical Impedance Tomography (EIT) is a radiation-free, non-invasive, low-cost, and functional imaging technique. The basic principle of EIT is to apply a safe current below the cell excitation threshold to the target area of ​​the human body using various excitation methods and different electrode arrangements. Then, voltage distribution data on the body surface is measured by scanning an array of electrodes, and an image of the target area is obtained based on this voltage distribution data.

[0003] The impedance change exhibited by an organism, tissue, organ, or cell under the influence of a safe current below its excitation threshold is called bioelectrical impedance. Under normal conditions, the impedance differences among various tissues in the human body are significant; when physiological or pathological conditions change, the conductivity values ​​of each tissue also change; moreover, the impedance difference between diseased and normal tissues is even greater. Therefore, the distribution and changes in conductivity within the body can reflect the physiological state of the human body to a certain extent and have important clinical value.

[0004] To perform biomedical electrical impedance imaging, a certain number of electrodes (commonly 8, 16, or 32) need to be arranged around the area to be measured (such as the human chest cavity). The electrodes are grouped according to a certain pattern, and excitation is applied and measurements are performed according to the grouping.

[0005] In actual measurements, electrodes may experience poor contact due to physical detachment, insufficient matching medium, excessive use, or hardware malfunctions. This can cause the effective measurement signal to be overwhelmed by noise, severely affecting the reliability of data acquisition and interfering with imaging results. Such electrodes that have lost their normal function are called disabled electrodes. In the presence of disabled electrodes, current technologies cannot obtain accurate and reliable electrical impedance imaging results. Summary of the Invention

[0006] To address the problems in the prior art, this application proposes a method, apparatus, storage medium, and electronic device for electrical impedance imaging, which can still obtain relatively accurate electrical impedance imaging results in the presence of disabled electrodes.

[0007] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0008] In a first aspect, embodiments of the present invention provide an electrical impedance imaging method applied to an electrical impedance imaging system, the electrical impedance imaging system including multiple electrodes disposed in a region to be measured; the method includes:

[0009] When a disabled electrode is detected among the plurality of electrodes, the electrodes other than the disabled electrode among the plurality of electrodes are grouped using a preset electrode grouping interval to obtain a first electrode group set;

[0010] The first set of electrodes is used as the first excitation electrode set;

[0011] The first set of electrodes is used as the first measuring electrode set;

[0012] Electrical impedance imaging is performed on the region to be measured based on the first excitation electrode group and the first measurement electrode group.

[0013] Preferably, the plurality of electrodes are arranged in a ring array in the region to be tested.

[0014] Furthermore, when the first electrode set does not include an electrode set consisting of two adjacent electrodes of the disabled electrode, the method further includes:

[0015] A second excitation electrode group is obtained based on the electrode adjacent to the disabled electrode and the electrode next to the disabled electrode.

[0016] The step of performing electrical impedance imaging on the region under test based on the first excitation electrode group and the first measurement electrode group includes:

[0017] Electrical impedance imaging is performed on the region to be measured based on the first excitation electrode group, the second excitation electrode group, and the first measurement electrode group.

[0018] Preferably, obtaining the second excitation electrode group based on the electrode adjacent to the disabled electrode and the electrode next to the disabled electrode includes:

[0019] The electrodes adjacent to the disabled electrode and the electrodes next to the disabled electrode are combined according to a preset combination method to obtain a second electrode group set;

[0020] Any subset of the second set of electrodes is used as the second excitation electrode set.

[0021] Preferably, the step of performing electrical impedance imaging on the region to be measured based on the first excitation electrode group, the second excitation electrode group, and the first measurement electrode group includes:

[0022] An excitation signal is input from each electrode group in the first excitation electrode group as a first excitation signal, and an output signal corresponding to the first excitation signal is collected from each electrode group in the first measurement electrode group;

[0023] The excitation signal is input from each electrode group in the second excitation electrode group as the second excitation signal, and the output signal corresponding to the second excitation signal is collected from each electrode group of the first measurement electrode group;

[0024] Signals that do not participate in imaging are excluded from the output signals corresponding to the first excitation signal and the output signals corresponding to the second excitation signal to obtain effective imaging signals;

[0025] An image reconstruction algorithm is used to invert the effective imaging signal to obtain the electrical impedance imaging results of the region under test.

[0026] Preferably, the output signals that do not participate in imaging among the output signals corresponding to the first excitation signal and the output signals corresponding to the second excitation signal include: self-excited self-measurement signals, reciprocal equivalent measurement signals, and measurement signals of the excitation measurement electrode group containing a common electrode.

[0027] Furthermore, when the first electrode set does not include an electrode set consisting of two adjacent electrodes of the disabled electrode, the method further includes:

[0028] A second set of measuring electrodes is obtained based on the electrode adjacent to the disabled electrode and the electrode next to the disabled electrode.

[0029] The step of performing electrical impedance imaging on the region under test based on the first excitation electrode group and the first measurement electrode group includes:

[0030] Electrical impedance imaging is performed on the region under test based on the first excitation electrode group, the first measurement electrode group, and the second measurement electrode group.

[0031] In a second aspect, embodiments of the present invention provide an electrical impedance imaging device for use in an electrical impedance imaging system, the electrical impedance imaging system including a plurality of electrodes disposed in the region to be measured; the device includes:

[0032] A grouping unit is used to group the electrodes other than the disabled electrode among the plurality of electrodes by a preset electrode grouping interval when a disabled electrode is detected among the plurality of electrodes, thereby obtaining a first electrode group set.

[0033] The first excitation electrode group acquisition unit is used to obtain the first electrode group set as the first excitation electrode group;

[0034] The first measuring electrode group acquisition unit is used to acquire the first electrode group set as the first measuring electrode group;

[0035] An electrical impedance imaging unit is used to perform electrical impedance imaging on the region under test based on the first excitation electrode group and the first measurement electrode group.

[0036] Thirdly, embodiments of the present invention provide a storage medium storing program code, which, when executed by a processor, implements the electrical impedance imaging method as described in any of the above embodiments.

[0037] Fourthly, embodiments of the present invention provide an electronic device, the electronic device including a memory and a processor, the memory storing program code executable on the processor, the program code being executed by the processor to implement the electrical impedance imaging method as described in any of the above embodiments.

[0038] The electrical impedance imaging method, apparatus, storage medium, and electronic device provided in this invention, when detecting the presence of a disabled electrode among multiple electrodes in a region to be measured, group the electrodes other than the disabled electrode among the multiple electrodes using a preset electrode grouping interval to obtain a first electrode group set. This first electrode group set is simultaneously used as a first excitation electrode group and a first measurement electrode group. Electrical impedance imaging of the region to be measured is then performed based on this first excitation electrode group and the first measurement electrode group. This allows the system to automatically group the remaining electrodes in the presence of a disabled electrode and perform a new electrical impedance imaging based on the excitation and measurement scheme obtained after grouping. Since the new electrical impedance imaging process excludes the disabled electrode, more accurate imaging results can be obtained, effectively overcoming the technical problems existing in the prior art. In other words, the technical solution provided in this invention can still obtain relatively accurate electrical impedance imaging results even in the presence of a disabled electrode. Attached Figure Description

[0039] The scope of this invention can be better understood by reading the following detailed description of exemplary embodiments in conjunction with the accompanying drawings. The accompanying drawings are:

[0040] Figure 1 This is a flowchart of a method according to an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of a single measurement in the 1 / 16 excitation measurement scheme of an embodiment of the present invention;

[0042] Figure 3 This is the excitation measurement table for the 1 / 16 excitation measurement scheme in this embodiment of the invention;

[0043] Figure 4 This is the excitation measurement table for the overall compensation scheme when electrode F is disabled in this embodiment of the invention;

[0044] Figure 5 This is an excitation measurement table for an additional compensation scheme when electrode F is disabled in this embodiment of the invention.

[0045] Figure 6 This is the normal electrical impedance imaging result of the 1 / 16 excitation measurement scheme in the embodiment of the present invention;

[0046] Figure 7 The impedance imaging results are shown in the 1 / 16 excitation measurement scheme of this invention when there is a disabled electrode (serial number F).

[0047] Figure 8 The impedance imaging results are for the overall compensation scheme of the 1 / 16 excitation measurement scheme in this embodiment of the invention.

[0048] Figure 9 The impedance imaging results are for the additional compensation scheme of the 1 / 16 excitation measurement scheme in the embodiments of the present invention.

[0049] Figure 10 This is a structural diagram of the device according to an embodiment of the present invention.

[0050] Explanation of reference numerals in the attached figures

[0051] 11-Measured area 12-Electrode 13-Excitation current 14-Measured voltage

[0052] 15- Measurement signal of the excitation measurement electrode group containing the common electrode

[0053] 16-Self-excitation and self-measurement signal Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the present invention clearer, the implementation method of the present invention will be described in detail below with reference to the accompanying drawings and embodiments, so that the process of how the present invention uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0055] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0056] Example 1

[0057] This invention utilizes other normal electrodes to perform compensatory measurements on the region near the disabled electrode, providing a power impedance imaging method that can improve image quality. Based on the location and serial number of the disabled electrode, this invention determines a new compensation excitation measurement scheme to compensate for the sensitivity of the power impedance imaging system to the region near the disabled electrode, obtaining inversion results that are essentially close to those of normal imaging.

[0058] The specific compensation approach is as follows:

[0059] First, define or abbreviate:

[0060] ① The electrode group that applies the excitation is called the excitation electrode group, and all the excitation electrode groups of a scheme constitute the excitation electrode group set E;

[0061] ② The electrode group used for measurement is called the measurement electrode group, and all the measurement electrode groups of a scheme constitute the measurement electrode group set M;

[0062] ③ The adjacent electrode AE ​​of the disabled electrode, and the next adjacent electrode SE;

[0063] ④ Subscripts 1 and 2 indicate the counterclockwise and clockwise directions of the disabled electrode, respectively;

[0064] ⑤ A specific stimulus and all its corresponding measurements are called a set of measurements;

[0065] ⑥ The original excitation measurement scheme groups all electrodes according to a certain electrode interval to obtain the electrode group set R.

[0066] An excitation measurement scheme can be viewed as a set of multiple measurements. Generally speaking, when all electrodes are working normally, the electrode set E is exactly the same as the electrode set M. After excluding the three cases of (1) self-excitation self-measurement, (2) reciprocal equivalent measurement, and (3) excitation measurement electrode set containing common electrodes, a set of excitation measurement schemes that can work normally is obtained.

[0067] If a disabled electrode is found, it is necessary to remove the disabled electrode and then reconstruct the electrode set E and electrode set M. For any excitation measurement scheme (i.e., the original excitation measurement scheme), the specific compensation scheme generation steps after knowing the disabled electrode number are as follows:

[0068] ① Overall Compensation: Discarding the disabled electrodes, the remaining normal electrodes are regrouped using the same electrode grouping intervals as the original excitation measurement scheme to obtain electrode group set N. Both electrode group set E and electrode group set M are selected from electrode group set N, and the excitation measurement scheme formed after excluding three scenarios is called the overall compensation scheme. The overall compensation scheme can perform compensated imaging independently.

[0069] ② Additional Compensation: Electrode sets C are obtained by combining adjacent and next-next-adjacent electrodes of the disabled electrode, typically including [AE1, AE2], [AE1, SE2], and [SE1, AE2]. Additional compensation refers to supplementing the overall compensation scheme or the original excitation measurement scheme with one or more additional sets of measurements. The excitation electrode set for additional compensation is electrode set C, and the measurement electrode set is usually selected from electrode set N or electrode set R after excluding the disabled electrode set (electrode set containing disabled electrodes). Due to the reciprocity of excitation measurements, electrode set C can also be equivalently selected as the measurement electrode set for additional compensation, and the electrode set obtained from electrode set N or electrode set R after excluding the disabled electrode set (electrode set containing disabled electrodes) can be used as the excitation electrode set for additional compensation.

[0070] The capacity of electrode set C can be flexibly adjusted and can be any subset of electrode set C. Of course, electrode set C can also include electrode set [SE1,SE2] or an electrode set composed of a third adjacent electrode, but since the latter has a lower correlation with the desensitized area, the compensation effect is not significant.

[0071] Based on the above ideas, this invention provides a method for electrical impedance tomography (EIT) applied to an EIT system, wherein the EIT system includes multiple electrodes disposed in the region to be measured. Figure 1 As shown, the method described in this embodiment includes steps S101, S102, S103, and S104. The specific details of these steps are described below:

[0072] Step S101: When a disabled electrode is detected among the plurality of electrodes, the electrodes other than the disabled electrode among the plurality of electrodes are grouped using a preset electrode grouping interval to obtain a first electrode group set.

[0073] Step S102: Use the first electrode group set as the first excitation electrode group;

[0074] Step S103: The first electrode group set is used as the first measurement electrode group;

[0075] Since data loss and data interference mainly occur near the disabled electrode, the distortion of the electrical impedance imaging results at the corresponding locations is particularly severe. Therefore, it is possible to determine whether there is a disabled electrode among the multiple electrodes based on the actual electrical impedance imaging results.

[0076] When a disabled electrode is present, it is removed, and the remaining normal electrodes are regrouped. For example, the electrodes can be grouped into pairs according to their spacing.

[0077] In this embodiment, the plurality of electrodes 12 are arranged in a ring array in the region to be tested 11, such as... Figure 2 As shown. In Figure 2 In this embodiment, excitation current 13 is used for current excitation, and measurement voltage 14 is used for voltage measurement. This grouping method, combined with the order of excitation and measurement, is called the excitation-measurement scheme. This embodiment follows... Figure 2 The electrodes are grouped into pairs according to their spacing. Excitation is applied to one group of electrodes, while the other groups are used for measurement. When all 16 electrodes are functioning normally, there are 16 groups of electrodes. For the excitation applied to each group, the remaining 13 groups of electrodes are used for measurement, resulting in a total of 16 × 13 = 208 measurements. Due to the reciprocity of excitation and measurement—that is, the electrode group used for excitation can also be used for measurement—only 104 measurements are ultimately needed for impedance imaging. Figure 6 This is the normal electrical impedance imaging result of the 1 / 16 excitation measurement scheme in the embodiment of the present invention.

[0078] Reference Figure 2 Taking a 16-electrode electrical impedance tomography (EITM) system as an example, the electrodes are typically numbered in hexadecimal (0, 1, 2, ..., F) and grouped according to different number intervals. When all electrodes are functioning normally, the electrode groups obtained under the same number interval are generally selected as both the excitation and measurement electrode sets. For example, grouping the electrodes with a number interval of 1, and using the resulting electrode sets as both the excitation and measurement electrode sets, is called a 1 / 16 excitation-measurement scheme. Similarly, there are also 2 / 16 and 3 / 16 excitation-measurement schemes. Figure 2 This is a schematic diagram of a measurement (excitation electrode group [4,3], measurement electrode group [2,1]) in a 1 / 16 excitation measurement scheme. Figure 3 This is the excitation measurement table for the 1 / 16 excitation measurement scheme, which contains all the contents of the 1 / 16 excitation measurement scheme and includes 104 measurement values.

[0079] Assume a disabled electrode exists in the 16-electrode electrical impedance tomography (EI) system. Different disabled electrode numbers correspond to different compensation schemes. However, due to the equivalence between electrodes, the disabled electrode number does not substantially affect the organization of the compensation scheme. For simplicity, we assume its number is F. Electrode F, with a grouping interval of 1, forms two electrode groups: [F,E] and [0,F]. Therefore, all measurements related to this group (numbers 79-104, accounting for 25% of all measurements) are interfered with and cannot be used. Figure 7 This is the impedance imaging result when there is a disabled electrode in the 1 / 16 excitation measurement scheme of the present invention.

[0080] When the system detects a disabled electrode F, it excludes electrode F and automatically regroups the remaining normal electrodes (0, 1, 2, ..., E) according to the original grouping interval (1 in this case) to obtain the first electrode group set [10, 21, 32, 43, 54, 65, 76, 87, 98, a9, ba, cb, dc, ed, 0e]. This first electrode group set [10, 21, 32, 43, 54, 65, 76, 87, 98, a9, ba, cb, dc, ed, 0e] is used simultaneously as the first excitation electrode group and the first measurement electrode group, as follows: Figure 4 As shown. In this embodiment, the method of re-obtaining the first excitation electrode group and the first measurement electrode group using the above method is referred to as the overall compensation scheme. Figure 4 This is the incentive measurement table for the overall compensation scheme. From Figure 4 As can be seen, there are a total of 90 measurement signals obtained through the overall compensation scheme for excitation measurement.

[0081] Step S104: Perform electrical impedance imaging on the region under test based on the first excitation electrode group and the first measurement electrode group.

[0082] In this embodiment, impedance imaging is performed on the area to be measured based on the first excitation electrode group and the first measurement electrode group, that is, impedance imaging is performed using the above-mentioned overall compensation scheme to obtain the corresponding impedance imaging results.

[0083] Specifically, in this embodiment, the step of performing electrical impedance imaging on the region to be measured based on the first excitation electrode group and the first measurement electrode group includes: inputting an excitation signal from each electrode group in the first excitation electrode group, acquiring an output signal corresponding to the excitation signal from each electrode group in the first measurement electrode group, and excluding signals in the output signal that do not participate in imaging to obtain an effective imaging signal; and using an image reconstruction algorithm to invert the effective imaging signal to obtain the electrical impedance imaging result of the region to be measured. Figure 8 The results are electrical impedance imaging results using the overall compensation scheme.

[0084] Specifically, an image reconstruction algorithm based on solving the inverse problem of electromagnetic field is used to invert the effective imaging signal, and finally the two-dimensional or three-dimensional image of the conductivity distribution or change state in the body is obtained as the electrical impedance imaging result of the region to be tested.

[0085] Furthermore, when the system groups the remaining normal electrodes in step S103, the first electrode group set obtained can also be [10,21,32,43,54,65,76,87,98,a9,ba,cb,dc,ed]. That is, in this embodiment, the first electrode group obtained by regrouping can include an electrode group [0,e] composed of two adjacent electrodes of the disabled electrode, or it can exclude the electrode group [0,e]. When the first electrode group set does not include the electrode group [0,e] composed of two adjacent electrodes of the disabled electrode, the following additional compensation scheme is executed in order to obtain more accurate electrical impedance imaging results.

[0086] When the first electrode set does not include an electrode set consisting of two adjacent electrodes of the disabled electrode, the method in this embodiment further includes: obtaining a second excitation electrode set based on the electrode adjacent to the disabled electrode and the electrode next to the disabled electrode. Then, the impedance imaging of the region to be measured based on the first excitation electrode set and the first measurement electrode set in this embodiment includes: performing impedance imaging of the region to be measured based on the first excitation electrode set, the second excitation electrode set, and the first measurement electrode set.

[0087] In this embodiment, obtaining a second excitation electrode group based on the electrode adjacent to the disabled electrode and the electrode next adjacent to the disabled electrode includes: combining the electrode adjacent to the disabled electrode and the electrode next adjacent to the disabled electrode according to a preset combination method to obtain a second electrode group set; and using any subset of the second electrode group set as the second excitation electrode group.

[0088] Specifically, the additional compensation scheme combines the adjacent electrodes (electrode E and electrode 0) and the next adjacent electrodes (electrode D and electrode 1) of the disabled electrode F to obtain a second electrode set [e0, e1, d0]. At this time, any subset of this second electrode set can be used as the excitation electrode set of the additional compensation scheme, i.e., the aforementioned second excitation electrode set. The measurement electrode set of the additional compensation scheme is usually selected from the set of electrode sets obtained after excluding the disabled electrode set. In this embodiment, the first electrode set obtained in the overall compensation scheme is directly used as the measurement electrode set of the additional compensation scheme. The excitation measurement table obtained by the above method is as follows: Figure 5 As shown. In Figure 5In this design, electrode set [10,21,32,43,54,65,76,87,98,a9,ba,cb,dc,ed] serves as both the first excitation electrode set and the first measurement electrode set; electrode set [e0,e1,d0] serves as the second excitation electrode set. Electrode set [e0,e1,d0] is added to the excitation electrode sets of the original measurement scheme (or overall compensation scheme) as an additional compensation method, correspondingly increasing the number of measurement sets by 34 (serial numbers 79-112).

[0089] Due to the reciprocity of excitation measurements, it is also possible to equivalently select the electrode set [e0,e1,d0] as the additional compensation measurement electrode set, and the electrode set obtained after excluding the disabled electrode set as the additional compensation excitation electrode set.

[0090] In this embodiment, when the first electrode set does not include an electrode set consisting of two adjacent electrodes of the disabled electrode, the method further includes: obtaining a second measurement electrode set based on the electrode adjacent to the disabled electrode and the electrode next to the disabled electrode. Therefore, the impedance imaging of the region to be measured based on the first excitation electrode set and the first measurement electrode set described in this embodiment includes: performing impedance imaging of the region to be measured based on the first excitation electrode set, the first measurement electrode set, and the second measurement electrode set.

[0091] In this embodiment, the step of performing electrical impedance imaging on the region under test based on the first excitation electrode group, the second excitation electrode group, and the first measurement electrode group includes: inputting an excitation signal from each electrode group in the first excitation electrode group as a first excitation signal; acquiring an output signal corresponding to the first excitation signal from each electrode group in the first measurement electrode group; inputting the excitation signal from each electrode group in the second excitation electrode group as a second excitation signal; acquiring an output signal corresponding to the second excitation signal from each electrode group in the first measurement electrode group; excluding signals that do not participate in imaging from the output signals corresponding to the first excitation signal and the output signals corresponding to the second excitation signal to obtain effective imaging signals; and using an image reconstruction algorithm to invert the effective imaging signals to obtain the electrical impedance imaging result of the region under test.

[0092] In this embodiment, the output signals corresponding to the first excitation signal and the output signals corresponding to the second excitation signal that do not participate in imaging include: self-excited self-measurement signals, reciprocal equivalent measurement signals, and measurement signals for excitation measurement electrode groups containing common electrodes. Specifically, the self-excited self-measurement signal is used to detect the working state of the electrodes.

[0093] Specifically, such as Figure 3 , Figure 4 and Figure 5 As shown, the self-excited self-measurement signal 16 is the portion within the black box in the figure, i.e., the part that is the same for both the excitation electrode group and the measurement electrode group; the reciprocal equivalent measurement signal is the symmetrical portion on both sides of the diagonal line formed by the black boxes in the figure. In practical applications, only the measurement signal from one side needs to be taken; the measurement signal 15, which includes the common electrode of the excitation and measurement electrode group, is the portion within the white box to the right of the diagonal line formed by the black boxes in the figure. Since the above three measurement signals do not participate in imaging, they need to be excluded.

[0094] In this embodiment, the step of performing electrical impedance imaging on the region under test based on the first excitation electrode group, the first measurement electrode group, and the second measurement electrode group includes: inputting an excitation signal from each electrode group in the first excitation electrode group; acquiring an output signal corresponding to the excitation signal from each electrode group in the first measurement electrode group as a first output signal; inputting an excitation signal from each electrode group in the first excitation electrode group; acquiring an output signal corresponding to the excitation signal from each electrode group in the second measurement electrode group as a second output signal; excluding signals that do not participate in imaging from the first output signal and the second output signal to obtain an effective imaging signal; and using an image reconstruction algorithm to invert the effective imaging signal to obtain the electrical impedance imaging result of the region under test.

[0095] Figure 9 The results are for electrical impedance imaging with additional compensation.

[0096] It should be noted that the technical solution provided in this embodiment is not limited to a 16-electrode electrical impedance imaging system or a specific excitation measurement method. Different electrode number systems and compensation schemes under different excitation measurement methods that can be obtained without creative effort are all within the protection scope of this invention.

[0097] To address the technical problem of distortion in electrical impedance imaging results caused by disabled electrodes in existing technologies, this invention proposes two compensation schemes for electrical impedance imaging: a comprehensive compensation scheme and an additional compensation scheme. The comprehensive compensation scheme replaces the original measurement scheme, while the additional compensation scheme supplements either the original measurement scheme or the comprehensive compensation scheme. The comprehensive compensation scheme is a reorganization of the original measurement scheme after discarding the disabled electrodes; essentially, it is an extension of the original measurement scheme when the number of electrodes is reduced. Therefore, the comprehensive compensation scheme can be modified according to the electrode grouping rules and disabled electrode serial numbers of the original measurement scheme, offering high flexibility. The additional compensation scheme provides targeted compensation for the area near the disabled electrodes. The additional compensation scheme can be broken down into several sub-schemes, which can be used individually or in combination.

[0098] The electrical impedance tomography (EIT) method provided in this invention, when detecting a disabled electrode among multiple electrodes in a region to be measured, groups the electrodes other than the disabled electrode among these multiple electrodes using a preset electrode grouping interval to obtain a first electrode group set. This first electrode group set is simultaneously used as a first excitation electrode group and a first measurement electrode group. EIT imaging of the region to be measured is then performed based on this first excitation electrode group and the first measurement electrode group. This allows the system to automatically group the remaining electrodes in the presence of a disabled electrode and perform a new EIT imaging based on the excitation and measurement scheme obtained after grouping. Since the new EIT imaging process excludes the disabled electrode, more accurate imaging results can be obtained, effectively overcoming the technical problems existing in the prior art. In other words, the technical solution provided in this invention can still obtain relatively accurate EIT imaging results even in the presence of a disabled electrode.

[0099] Example 2

[0100] Corresponding to the above method embodiments, the present invention also provides an electrical impedance imaging device, applied to an electrical impedance imaging system, the electrical impedance imaging system including multiple electrodes disposed in the region to be measured; such as Figure 10 As shown, the device includes:

[0101] Grouping unit 201 is used to group the electrodes other than the disabled electrode among the plurality of electrodes by using a preset electrode grouping interval when a disabled electrode is detected among the plurality of electrodes, to obtain a first electrode group set.

[0102] The first excitation electrode group acquisition unit 202 is used to acquire the first electrode group set as the first excitation electrode group;

[0103] The first measuring electrode group acquisition unit 203 is used to acquire the first electrode group set as the first measuring electrode group;

[0104] Electrical impedance imaging unit 204 is used to perform electrical impedance imaging on the region to be measured based on the first excitation electrode group and the first measurement electrode group.

[0105] In this embodiment, the plurality of electrodes are arranged in a ring array in the area to be tested.

[0106] Furthermore, the apparatus described in this embodiment also includes:

[0107] The second excitation electrode group acquisition unit is used to obtain a second excitation electrode group based on the electrode adjacent to the disabled electrode and the electrode next to the disabled electrode when the first electrode group set does not include an electrode group consisting of two adjacent electrodes of the disabled electrode.

[0108] Therefore, the electrical impedance imaging unit 204 described in this embodiment is also used to perform electrical impedance imaging on the region to be measured based on the first excitation electrode group, the second excitation electrode group and the first measurement electrode group.

[0109] In this embodiment, the second excitation electrode group acquisition unit obtains the second excitation electrode group in the following manner:

[0110] The electrodes adjacent to the disabled electrode and the electrodes next to the disabled electrode are combined according to a preset combination method to obtain a second electrode group set;

[0111] Any subset of the second set of electrodes is used as the second excitation electrode set.

[0112] In this embodiment, the electrical impedance imaging unit 204 includes:

[0113] The first excitation measurement unit is used to input an excitation signal as a first excitation signal from each electrode group in the first excitation electrode group, and to collect an output signal corresponding to the first excitation signal from each electrode group in the first measurement electrode group;

[0114] The second excitation measurement unit is used to input the excitation signal as the second excitation signal from each electrode group in the second excitation electrode group, and to collect the output signal corresponding to the second excitation signal from each electrode group of the first measurement electrode group;

[0115] The signal elimination unit is used to eliminate signals that do not participate in imaging from the output signal corresponding to the first excitation signal and the output signal corresponding to the second excitation signal, so as to obtain an effective imaging signal;

[0116] The inversion unit is used to invert the effective imaging signal using an image reconstruction algorithm to obtain the electrical impedance imaging result of the region to be measured.

[0117] In this embodiment, the output signals that do not participate in imaging among the output signals corresponding to the first excitation signal and the output signals corresponding to the second excitation signal include: self-excited self-measurement signals, reciprocal equivalent measurement signals, and measurement signals of the excitation measurement electrode group containing common electrodes.

[0118] Furthermore, the apparatus described in this embodiment also includes:

[0119] The second measuring electrode group acquisition unit is used to obtain a second measuring electrode group based on the electrode adjacent to the disabled electrode and the electrode next to the disabled electrode when the first electrode group set does not include an electrode group consisting of two adjacent electrodes of the disabled electrode.

[0120] Therefore, the electrical impedance imaging unit 204 described in this embodiment is also used to perform electrical impedance imaging on the region to be measured based on the first excitation electrode group, the first measurement electrode group and the second measurement electrode group.

[0121] For details regarding the working principle, workflow, and specific implementation methods of the aforementioned device, please refer to the specific implementation methods of the electrical impedance imaging method provided by this invention. The same technical content will not be described in detail here.

[0122] The electrical impedance imaging device provided in this invention, when detecting a disabled electrode among multiple electrodes in a region to be measured, groups the electrodes other than the disabled electrode among the multiple electrodes using a preset electrode grouping interval to obtain a first electrode group set. This first electrode group set is simultaneously used as a first excitation electrode group and a first measurement electrode group. Electrical impedance imaging is then performed on the region to be measured based on this first excitation electrode group and the first measurement electrode group. This allows the system to automatically group the remaining electrodes in the presence of a disabled electrode and perform a new electrical impedance imaging based on the excitation and measurement scheme obtained after grouping. Since the new electrical impedance imaging process excludes the disabled electrode, it can obtain more accurate imaging results, effectively overcoming the technical problems existing in the prior art. In other words, the technical solution provided in this invention can still obtain relatively accurate electrical impedance imaging results even in the presence of a disabled electrode.

[0123] Example 3

[0124] According to an embodiment of the present invention, a storage medium is also provided, wherein program code is stored on the storage medium, and when the program code is executed by a processor, it implements the electrical impedance imaging method as described in any of the above embodiments.

[0125] Example 4

[0126] According to an embodiment of the present invention, an electronic device is also provided, the electronic device including a memory and a processor, wherein the memory stores program code that can run on the processor, and when the program code is executed by the processor, it implements the electrical impedance imaging method as described in any of the above embodiments.

[0127] The electrical impedance imaging method, apparatus, storage medium, and electronic device provided in this invention, when detecting the presence of a disabled electrode among multiple electrodes in a region to be measured, group the electrodes other than the disabled electrode among the multiple electrodes using a preset electrode grouping interval to obtain a first electrode group set. This first electrode group set is simultaneously used as a first excitation electrode group and a first measurement electrode group. Electrical impedance imaging of the region to be measured is then performed based on this first excitation electrode group and the first measurement electrode group. This allows the system to automatically group the remaining electrodes in the presence of a disabled electrode and perform a new electrical impedance imaging based on the excitation and measurement scheme obtained after grouping. Since the new electrical impedance imaging process excludes the disabled electrode, more accurate imaging results can be obtained, effectively overcoming the technical problems existing in the prior art. In other words, the technical solution provided in this invention can still obtain relatively accurate electrical impedance imaging results even in the presence of a disabled electrode.

[0128] This invention discloses a power impedance imaging method that can compensate for image damage caused by electrode failure during power impedance imaging. To address the image distortion caused by failed electrodes in power impedance imaging systems, two methods are proposed: an overall compensation scheme and an additional compensation scheme.

[0129] This solution has the following advantages:

[0130] (1) It can output EIT images of near-normal quality under the condition of electrode failure, thereby improving the robustness of the EIT system;

[0131] (2) It has good scalability and combinability, and can be flexibly adjusted according to the actual situation. Under different application backgrounds, it can obtain several specific solutions based on two compensation ideas to compensate for damaged images.

[0132] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0133] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the embodiments of the present invention, depending on actual needs.

[0134] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0135] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause an electronic device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0136] While the embodiments disclosed in this invention are as described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and changes in form and detail of the implementation without departing from the spirit and scope disclosed herein; however, the scope of protection of this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A method for electrical impedance imaging, applied to an electrical impedance imaging system, the electrical impedance imaging system comprising multiple electrodes disposed in the region to be measured; characterized in that, The method includes: When a disabled electrode is detected among the plurality of electrodes, the electrodes other than the disabled electrode among the plurality of electrodes are grouped using a preset electrode grouping interval to obtain a first electrode group set; The first set of electrodes is used as the first excitation electrode set; The first set of electrodes is used as the first measuring electrode set; Electrical impedance imaging is performed on the region to be measured based on the first excitation electrode group and the first measurement electrode group; When the first electrode set does not include an electrode set consisting of two adjacent electrodes of the disabled electrode, the following additional compensation scheme is also performed: The method further includes: obtaining a second excitation electrode group based on the electrode adjacent to the disabled electrode and the electrode next adjacent to the disabled electrode, wherein the second excitation electrode group is obtained by combining the electrode adjacent to the disabled electrode and the electrode next adjacent to the disabled electrode; the step of performing electrical impedance imaging on the region to be measured based on the first excitation electrode group and the first measurement electrode group includes: performing electrical impedance imaging on the region to be measured based on the first excitation electrode group, the second excitation electrode group, and the first measurement electrode group; Alternatively, the method further includes: obtaining a second measurement electrode group based on the electrode adjacent to the disabled electrode and the electrode next adjacent to the disabled electrode, wherein the second measurement electrode group is obtained by combining the electrode adjacent to the disabled electrode and the electrode next adjacent to the disabled electrode; the step of performing electrical impedance imaging on the region to be measured based on the first excitation electrode group and the first measurement electrode group includes: performing electrical impedance imaging on the region to be measured based on the first excitation electrode group, the first measurement electrode group and the second measurement electrode group.

2. The electrical impedance imaging method according to claim 1, characterized in that, The multiple electrodes are arranged in a ring array in the area to be tested.

3. The electrical impedance imaging method according to claim 1, characterized in that, The method of obtaining a second excitation electrode group based on the electrode adjacent to the disabled electrode and the electrode next to the disabled electrode includes: The electrodes adjacent to the disabled electrode and the electrodes next to the disabled electrode are combined according to a preset combination method to obtain a second electrode group set; The second electrode set itself is used as the second excitation electrode set.

4. The electrical impedance imaging method according to claim 1, characterized in that, The step of performing electrical impedance imaging on the region under test based on the first excitation electrode group, the second excitation electrode group, and the first measurement electrode group includes: An excitation signal is input from each electrode group in the first excitation electrode group as a first excitation signal, and an output signal corresponding to the first excitation signal is collected from each electrode group in the first measurement electrode group; The excitation signal is input from each electrode group in the second excitation electrode group as the second excitation signal, and the output signal corresponding to the second excitation signal is collected from each electrode group of the first measurement electrode group; Signals that do not participate in imaging are excluded from the output signals corresponding to the first excitation signal and the output signals corresponding to the second excitation signal to obtain effective imaging signals; An image reconstruction algorithm is used to invert the effective imaging signal to obtain the electrical impedance imaging results of the region under test.

5. The electrical impedance imaging method according to claim 4, characterized in that, The output signals corresponding to the first excitation signal and the output signals corresponding to the second excitation signal that do not participate in imaging include: self-excited self-measurement signals, reciprocal equivalent measurement signals, and measurement signals of the excitation measurement electrode group containing a common electrode.

6. An electrical impedance imaging device, applied to an electrical impedance imaging system, the electrical impedance imaging system comprising a plurality of electrodes disposed in the region to be measured; characterized in that, The device includes: A grouping unit is used to group the electrodes other than the disabled electrode among the plurality of electrodes by a preset electrode grouping interval when a disabled electrode is detected among the plurality of electrodes, thereby obtaining a first electrode group set. The first excitation electrode group acquisition unit is used to obtain the first electrode group set as the first excitation electrode group; The first measuring electrode group acquisition unit is used to acquire the first electrode group set as the first measuring electrode group; An electrical impedance imaging unit is used to perform electrical impedance imaging on the region to be measured based on the first excitation electrode group and the first measurement electrode group. The device further includes: a second excitation electrode group acquisition unit or a second measurement electrode group acquisition unit; The second excitation electrode group acquisition unit is used to obtain a second excitation electrode group based on the electrode adjacent to the disabled electrode and the electrode next to the disabled electrode when the first electrode group set does not include an electrode group composed of two adjacent electrodes of the disabled electrode. The second excitation electrode group is obtained by combining the electrode adjacent to the disabled electrode and the electrode next to the disabled electrode. The second measuring electrode group acquisition unit is used to obtain a second measuring electrode group based on the electrode adjacent to the disabled electrode and the electrode next to the disabled electrode when the first electrode group set does not include an electrode group consisting of two adjacent electrodes of the disabled electrode. The second measuring electrode group is obtained by combining the electrode adjacent to the disabled electrode and the electrode next to the disabled electrode. The electrical impedance imaging unit is further configured to perform electrical impedance imaging on the region under test based on the first excitation electrode group, the second excitation electrode group, and the first measurement electrode group; or, to perform electrical impedance imaging on the region under test based on the first excitation electrode group, the first measurement electrode group, and the second measurement electrode group.

7. A storage medium storing program code, characterized in that, When the program code is executed by the processor, it implements the electrical impedance imaging method as described in any one of claims 1 to 5.

8. An electronic device, characterized in that, The electronic device includes a memory and a processor. The memory stores program code that can run on the processor. When the program code is executed by the processor, it implements the electrical impedance tomography method as described in any one of claims 1 to 5.

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