CN114711746A - Electrical impedance imaging method, electrical impedance imaging device, storage medium, and electronic apparatus - Google Patents
Electrical impedance imaging method, electrical impedance imaging device, storage medium, and electronic apparatus Download PDFInfo
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- A61B5/053—Measuring electrical impedance or conductance of a portion of the body
- A61B5/0536—Impedance imaging, e.g. by tomography
Abstract
The invention provides an electrical impedance imaging method, an electrical impedance imaging device, a storage medium and electronic equipment, and relates to the technical field of electrical impedance imaging, wherein the method is applied to an electrical impedance imaging system, the electrical impedance imaging system comprises a plurality of electrodes arranged in a region to be detected, and the method comprises the following steps: when detecting that an incapacitated electrode exists in the plurality of electrodes, grouping the electrodes except the incapacitated electrode in the plurality of electrodes by adopting a preset electrode grouping interval to obtain a first electrode group set; taking the first set of electrode groups as a first set of excitation electrode groups; taking the first set of electrode sets as a first set of measurement electrodes; and carrying out electrical impedance imaging on the area to be measured based on the first excitation electrode group and the first measuring electrode group. The technical scheme provided by the invention can still obtain a more accurate electrical impedance imaging result under the condition that the disabling electrode exists.
Description
Technical Field
The present invention relates to the field of electrical impedance imaging technology, and in particular, to an electrical impedance imaging method, apparatus, storage medium, and electronic device.
Background
Electrical Impedance Tomography (EIT) is a non-radiative, non-invasive, low-cost, functionally imageable technique. The basic principle of electrical impedance imaging is that according to different electrode arrangement schemes, a safe current lower than a cell excitation threshold value is applied to a human body region to be measured in multiple excitation modes, then the voltage distribution data of the body surface is measured by scanning array electrodes, and an image of the human body region to be measured is obtained based on the voltage distribution data.
The impedance change of an organism or a biological tissue, a biological organ or a biological cell under the action of a safe current below an excitation threshold is called bioelectrical impedance. In a normal state, the impedance difference of each tissue of the human body is large; when the physiological and pathological states change, the conductivity value of each tissue changes; moreover, the impedance values of the diseased tissue and the normal tissue differ more. Therefore, the distribution and change of the in vivo conductivity can reflect the physiological state of the human body to a certain extent, and the method has important clinical value.
In order to perform biomedical electrical impedance imaging, a certain number of electrodes (usually 8, 16 or 32) are arranged around a region to be measured (such as a human thorax), and the electrodes are grouped according to a certain rule, and excitation is applied according to the groups to perform measurement.
In actual measurement, the electrode may have poor contact due to physical falling, insufficient matching medium, excessive use times, hardware equipment failure and the like, so that an effective measurement signal is submerged by noise, the reliability of data acquisition is seriously affected, and an imaging result is interfered. Such an electrode that loses normal function is called a disabled electrode. Under the condition of the existence of the disabling electrode, the prior art can not obtain an accurate and reliable electrical impedance imaging result.
Disclosure of Invention
In view of the above problems in the prior art, the present application provides an electrical impedance imaging method, an electrical impedance imaging apparatus, a storage medium, and an electronic device, which can obtain a more accurate electrical impedance imaging result even in the presence of a disabled electrode.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides an electrical impedance imaging method, which is applied to an electrical impedance imaging system, where the electrical impedance imaging system includes a plurality of electrodes disposed in a region to be measured; the method comprises the following steps:
when detecting that an incapacitated electrode exists in the plurality of electrodes, grouping the electrodes except the incapacitated electrode in the plurality of electrodes by adopting a preset electrode grouping interval to obtain a first electrode group set;
taking the first set of electrode groups as a first set of excitation electrodes;
taking the first set of electrode sets as a first set of measurement electrodes;
and carrying out electrical impedance imaging on the area to be measured based on the first excitation electrode group and the first measuring electrode group.
Preferably, the plurality of electrodes are arranged in a circular array in the region to be measured.
Further, when an electrode group consisting of two adjacent electrodes of the disabled electrode is not included in the first set of electrode groups, the method further comprises:
obtaining a second set of energized electrodes based on an electrode adjacent to the de-energized electrode and an electrode next adjacent to the de-energized electrode;
the electrical impedance imaging of the region to be measured based on the first excitation electrode group and the first measurement electrode group comprises:
and carrying out electrical impedance imaging on the area to be measured based on the first excitation electrode group, the second excitation electrode group and the first measurement electrode group.
Preferably, said obtaining a second set of excitation electrodes based on an electrode adjacent to said disabled electrode and an electrode next adjacent to said disabled electrode comprises:
combining the electrode adjacent to the disabled electrode and the electrode next adjacent to the disabled electrode according to a preset combination mode to obtain a second electrode group set;
any subset of the second set of electrode sets is taken as the second set of excitation electrodes.
Preferably, the electrical impedance imaging of the region to be measured based on the first excitation electrode group, the second excitation electrode group and the first measurement electrode group includes:
inputting an excitation signal as a first excitation signal from each of the first excitation electrode groups, acquiring an output signal corresponding to the first excitation signal from each of the first measurement electrode groups;
inputting the excitation signal as a second excitation signal from each of the second excitation electrode groups, acquiring an output signal corresponding to the second excitation signal from each of the first measurement electrode groups;
excluding signals not participating in imaging from the output signal corresponding to the first excitation signal and the output signal corresponding to the second excitation signal, obtaining effective imaging signals;
and carrying out inversion on the effective imaging signals by adopting an image reconstruction algorithm to obtain an electrical impedance imaging result of the region to be detected.
Preferably, a signal that does not participate in imaging, of the output signal corresponding to the first excitation signal and the output signal corresponding to the second excitation signal, includes: the self-excited self-measurement signal, the reciprocity-equivalent measurement signal, and the measurement signal for which the set of excitation measurement electrodes comprises a common electrode.
Further, when an electrode group consisting of two adjacent electrodes of the disabled electrode is not included in the first set of electrode groups, the method further comprises:
obtaining a second set of measurement electrodes based on an electrode adjacent to the disabled electrode and an electrode next adjacent to the disabled electrode;
the electrical impedance imaging of the region to be measured based on the first excitation electrode group and the first measurement electrode group comprises:
and carrying out electrical impedance imaging on the area to be measured based on the first excitation electrode group, the first measurement electrode group and the second measurement electrode group.
In a second aspect, an embodiment of the present invention provides an electrical impedance imaging apparatus, which is applied to an electrical impedance imaging system, where the electrical impedance imaging system includes a plurality of electrodes disposed in a region to be measured; the device comprises:
the grouping unit is used for grouping the electrodes except for the disabled electrodes in the plurality of electrodes by adopting a preset electrode grouping interval when the disabled electrodes are detected to exist in the plurality of electrodes, so as to obtain a first electrode group set;
a first excitation electrode group acquisition unit configured to take the first electrode group set as a first excitation electrode group;
a first measurement electrode group acquisition unit configured to take the first electrode group set as a first measurement electrode group;
and the electrical impedance imaging unit is used for carrying out electrical impedance imaging on the region to be measured based on the first excitation electrode group and the first measurement electrode group.
In a third aspect, embodiments of the present invention provide a storage medium having program code stored thereon, which when executed by a processor, implements an electrical impedance imaging method as described in any one of the above embodiments.
In a fourth aspect, embodiments of the present invention provide an electronic device, which includes a memory and a processor, wherein the memory stores program codes executable on the processor, and when the program codes are executed by the processor, the electronic device implements an electrical impedance imaging method as described in any one of the above embodiments.
According to the electrical impedance imaging method, the electrical impedance imaging device, the storage medium and the electronic equipment, when the incapability electrode exists in the plurality of electrodes of the area to be measured, the electrodes except the incapability electrode in the plurality of electrodes are grouped by adopting the preset electrode grouping interval to obtain the first electrode group set, the first electrode group set is simultaneously used as the first excitation electrode group and the first measurement electrode group, and then electrical impedance imaging is carried out on the area to be measured on the basis of the first excitation electrode group and the first measurement electrode group, so that under the condition that the incapability electrode exists, a system can automatically group the rest electrodes, and new electrical impedance imaging is carried out on the basis of the excitation measurement scheme obtained after grouping. Because the new electrical impedance imaging process excludes the disabling electrode, a more accurate imaging result can be obtained, and the technical problems in the prior art are effectively overcome. Namely, the technical scheme provided by the embodiment of the invention can still obtain a more accurate electrical impedance imaging result under the condition that the disabling electrode exists.
Drawings
The scope of the present disclosure will be better understood from the following detailed description of exemplary embodiments, which is to be read in connection with the accompanying drawings. Wherein the included drawings are:
FIG. 1 is a flow chart of a method of an embodiment of the present invention;
FIG. 2 is a schematic illustration of a measurement in an 1/16 excitation measurement scheme in an embodiment of the invention;
FIG. 3 is an excitation meter for an 1/16 excitation measurement scheme in an embodiment of the invention;
FIG. 4 is an excitation measurement chart of the overall compensation scheme when the electrode F is disabled according to the embodiment of the present invention;
FIG. 5 is a table of additional compensation scheme excitation measurements when electrode F is disabled in an embodiment of the present invention;
FIG. 6 shows the results of normal electrical impedance imaging of an 1/16 excitation measurement scheme in an embodiment of the invention;
FIG. 7 shows the electrical impedance imaging result of 1/16 with an incapacitating electrode (number F) in the excitation measurement scheme in the example of the present invention;
FIG. 8 is an electrical impedance imaging result of an overall compensation scheme of the 1/16 excitation measurement scheme in an embodiment of the invention;
FIG. 9 is an electrical impedance imaging result of an additional compensation scheme of the 1/16 excitation measurement scheme in an embodiment of the invention;
FIG. 10 is a diagram showing the structure of an apparatus according to an embodiment of the present invention.
Description of the reference numerals
11-area to be measured 12-electrode 13-excitation current 14-measurement voltage
15-exciting the measurement signal of the measurement electrode set containing the common electrode
16-self-excited self-measured signal
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the following will describe in detail an implementation method of the present invention with reference to the accompanying drawings and embodiments, so that how to apply technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Example one
The invention provides an electrical impedance imaging method capable of improving imaging quality by utilizing other normal electrodes to perform compensation measurement on the area near the disabled electrode. According to the invention, a new compensation excitation measurement scheme is determined according to the position and the serial number of the disabling electrode, the sensitivity of the electrical impedance imaging system to the area near the disabling electrode is compensated, and an inversion result basically close to the normal imaging condition is obtained.
The specific compensation concept is as follows:
first defined or abbreviated:
firstly, an electrode group for applying excitation is an excitation electrode group, and all the excitation electrode groups of one scheme form an excitation electrode group set E;
the electrode group for measurement is a measurement electrode group, and all measurement electrode groups of a group of schemes form a measurement electrode group set M;
adjacent electrode AE of the disabling electrode, next adjacent electrode SE;
one specific excitation and all the corresponding measurements are called a group of measurements;
sixthly, grouping all the electrodes according to a certain electrode interval by the original excitation measurement scheme to obtain an electrode group set R.
An excitation measurement scheme may be viewed as a collection of sets of measurements. Generally, when all electrodes work normally, the electrode group set E is identical to the electrode group set M; and (3) excluding three situations of (1) self-excitation self-measurement, (2) reciprocal equivalent measurement and (3) the excitation measurement electrode group comprises a common electrode, so as to obtain a group of excitation measurement schemes capable of working normally.
If the disabled electrodes appear, the electrode group set E and the electrode group set M are reconstructed after the disabled electrodes are eliminated. For any excitation measurement scheme (namely the original excitation measurement scheme), the specific compensation scheme generation steps after the serial number of the known disabled electrode are as follows:
integral compensation: and discarding the disabled electrodes, and regrouping the remaining normal electrodes along the electrode grouping interval of the original excitation measurement scheme to obtain an electrode group set N. The electrode group set E and the electrode group set M both adopt the electrode group set N, and an excitation measurement scheme formed by excluding the three conditions is called an overall compensation scheme. The overall compensation scheme can independently perform compensation imaging.
② additional compensation: combining adjacent ones of the disabled electrodes and next adjacent ones of the disabled electrodes with one another results in an electrode set C, typically comprising [ AE1,AE2]，[AE1,SE2]，[SE1,AE2]. The additional compensation means that one or more groups of measurement are additionally supplemented on the basis of the overall compensation scheme or the original excitation measurement scheme. The excitation electrode set for the additional compensation is an electrode set C, and the measurement electrode set is usually selected from the electrode set N or the electrode set R excluding the disabled electrode set (the electrode set containing the disabled electrode). Due to the reciprocity of excitation measurement, it is also possible to equivalently select the electrode set C as the measurement electrode set for additional compensation, and use the electrode set obtained after excluding the disabled electrode set (the electrode set containing the disabled electrode) from the electrode set N or the electrode set R as the excitation electrode set for additional compensation.
The capacity of the electrode group set C can be flexibly adjusted, and can be any subset of the electrode group set C. Of course, the electrode set C may also include electrode sets [ SE ]1,SE2]Or a third adjacent electrode, but the compensation effect is not significant because the latter is less correlated with the desensitized zone.
Based on the above thought, the embodiment of the invention provides an electrical impedance imaging method, which is applied to an electrical impedance imaging system, wherein the electrical impedance imaging system comprises a plurality of electrodes arranged in a region to be detected. As shown in fig. 1, the method of this embodiment includes step S101, step S102, step S103, and step S104, and the specific contents of these steps are described in detail as follows:
step S101, when detecting that a disabled electrode exists in the plurality of electrodes, grouping the electrodes except the disabled electrode in the plurality of electrodes by adopting a preset electrode grouping interval to obtain a first electrode group set;
step S102, taking the first electrode group set as a first excitation electrode group;
step S103, taking the first electrode group set as a first measurement electrode group;
because data loss and data interference mainly occur near the disabled electrodes, the distortion of the electrical impedance imaging result at the corresponding position is particularly serious, and therefore, whether the disabled electrodes exist in the plurality of electrodes can be judged based on the actual electrical impedance imaging result.
When the disabled electrode exists, the disabled electrode is excluded, and the remaining normal electrodes are regrouped. For example, the electrodes may be grouped into two groups according to the pitch size.
In this embodiment, the plurality of electrodes 12 are arranged in a circular array in the region to be measured 11, as shown in fig. 2. In fig. 2, current excitation using excitation current 13, voltage measurement using measurement voltage 14, and this grouping method combined with the sequencing of the excitation measurements is referred to as the excitation measurement scheme. In the present embodiment, the electrodes are divided into two groups according to the size of the space in the manner shown in fig. 2, and excitation is applied to one group of electrodes and measurement is performed to the other group of electrodes. When all the 16 electrodes work normally, the 16 groups of electrodes are shared. For the excitation applied by each set of electrodes, measurements were taken from the remaining 13 sets of electrodes, thus giving a total of 16 × 13 — 208 measurements. Because of the reciprocity of excitation and measurement, i.e. the electrode set used as excitation can also be used as the electrode set used for measurement, finally only 104 measurement values are used for electrical impedance imaging. FIG. 6 shows the results of normal electrical impedance imaging for an 1/16 excitation measurement scheme in an embodiment of the invention.
Referring to FIG. 2, taking a 16-electrode electrical impedance imaging system as an example, electrodes are typically numbered (0,1,2, …, F) in 16 and spaced by different numbers. When all electrodes are working normally, the grouping results of the electrodes obtained at the same sequence number interval are generally selected as the set of excitation and measurement electrode groups. For example, the electrodes are grouped at a sequence number interval of 1, and the electrode groups obtained after the grouping are used as both an excitation electrode group and a measurement electrode group, and this excitation measurement scheme is referred to as 1/16 excitation measurement scheme. Similarly, there are also 2/16, 3/16 excitation measurement schemes. FIG. 2 is a diagram of 1/16 excitation measurement schemes for a measurement (excitation electrode set [4,3], measurement electrode set [2,1 ]). FIG. 3 is an excitation measurement chart for an 1/16 excitation measurement scheme, which contains the entire contents of the 1/16 excitation measurement scheme, including 104 measurements.
Assuming that a disabled electrode exists in a 16-electrode electrical impedance imaging system, the serial number of the disabled electrode is different, and the corresponding compensation scheme is also different. However, due to the equivalence between the electrodes, the number of the disabled electrode does not substantially affect the structure of the compensation scheme. For convenience of presentation, the serial number is assumed to be F. Electrode F participated in the composition of two electrode groups [ F, E ], [0, F ] at a compartment interval of 1, so all measurements related thereto (serial numbers 79-104, accounting for 25% of the total number of measurements) were disturbed and could not be used further. FIG. 7 shows the electrical impedance imaging results of an 1/16 excitation measurement scheme with a single disabled electrode in accordance with an embodiment of the present invention.
When the system detects the disabled electrode F, the electrode F is automatically regrouped after being excluded, that is, the system groups the remaining normal electrodes (0,1,2, …, E) according to the grouping interval (here, 1) of the original scheme to obtain a first electrode group set [10,21,32,43,54,65,76,87,98, a9, ba, cb, dc, ed,0E ]. This first set of electrode sets [10,21,32,43,54,65,76,87,98, a9, ba, cb, dc, ed,0e ] is used as both the first set of excitation electrodes and the first set of measurement electrodes, as shown in FIG. 4. In this embodiment, the manner of recovering the first excitation electrode set and the first measurement electrode set by the above method is referred to as an overall compensation scheme. Fig. 4 is an excitation meter of the overall compensation scheme. As can be seen from fig. 4, there are 90 measurement signals obtained by excitation measurement by the global compensation scheme.
And step S104, performing electrical impedance imaging on the region to be measured based on the first excitation electrode group and the first measurement electrode group.
In this embodiment, electrical impedance imaging is performed on the region to be measured based on the first excitation electrode group and the first measurement electrode group, that is, the above-mentioned overall compensation scheme is adopted to perform electrical impedance imaging, so as to obtain a corresponding electrical impedance imaging result.
Specifically, in this embodiment, the 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 which do not participate in imaging from the output signals to obtain effective imaging signals; and carrying out inversion on the effective imaging signals by adopting an image reconstruction algorithm to obtain an electrical impedance imaging result of the region to be detected. FIG. 8 shows the results of electrical impedance imaging using an integral compensation scheme.
Specifically, an image reconstruction algorithm based on electromagnetic field inverse problem solving is adopted to invert the effective imaging signals, and finally a two-dimensional or three-dimensional image of the in-vivo conductivity distribution state or change state is obtained through inversion and is used as an electrical impedance imaging result of the region to be detected.
Furthermore, when the system groups the remaining normal electrodes in step S103, the obtained first electrode group set may also be [10,21,32,43,54,65,76,87,98, a9, ba, cb, dc, ed ], that is, in the present embodiment, the first electrode group obtained by re-grouping may include the electrode group [0, e ] composed of two adjacent electrodes of the disabled electrode, or may not include the electrode group [0, e ], and when the electrode group [0, e ] composed of two adjacent electrodes of the disabled electrode is not included in the first electrode group set, in order to obtain a more accurate electrical impedance imaging result, the following additional compensation scheme is performed.
When an electrode group composed of two adjacent electrodes of the disabled electrode is not included in the first electrode group set, the method of this embodiment further includes: obtaining a second excitation electrode group based on an electrode adjacent to the disabled electrode and an electrode next adjacent to the disabled electrode, where the performing electrical impedance imaging on the region to be measured based on the first excitation electrode group and the first measurement electrode group in this embodiment includes: and carrying out electrical impedance imaging on the area to be measured based on the first excitation electrode group, the second excitation electrode group and the first measurement electrode group.
In this embodiment, the obtaining a second excitation electrode group based on an electrode adjacent to the disabled electrode and an 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 mode to obtain a second electrode group set; any subset of the second set of electrode sets is taken as the second set of excitation electrodes.
Specifically, the additional compensation scheme combines adjacent electrodes of the disabled electrode F (electrode E and electrode 0) and the next adjacent electrode (electrode D and electrode 1) to yield a second set of electrode groups [ E0, E1, D0 ]. At this time, any subset of the second set of electrode sets may be used as the excitation electrode set of the additional compensation scheme, i.e., the second excitation electrode set described above. The measurement electrode set of the additional compensation scheme is usually selected from the electrode set obtained after excluding the disabled electrode set, and the embodiment directly uses the first electrode set obtained in the above-mentioned overall compensation scheme as the measurement electrode set of the additional compensation scheme. The excitation meter obtained by the above method is shown in fig. 5. In FIG. 5, the set of electrode sets [10,21,32,43,54,65,76,87,98, a9, ba, cb, dc, ed ] serves as both the first set of excitation electrodes and the first set of measurement electrodes; the set of electrode groups [ e0, e1, d0] serves as the second excitation electrode group. The set of electrode sets [ e0, e1, d0] is added as an extra compensation to the excitation electrode sets of the original measurement scheme (or the global compensation scheme), with a corresponding addition of 34 measurement sets (serial numbers 79-112).
Due to the reciprocity of excitation measurement, the electrode group set [ e0, e1, d0] can be equivalently selected as the additionally compensated measurement electrode group, and the electrode group set obtained after the disabling electrode group is excluded can be used as the additionally compensated excitation electrode group set.
That is, in this embodiment, when an electrode group composed of two adjacent electrodes of the disabled electrode is not included in the first electrode group set, the method further includes: obtaining a second measurement electrode group based on an electrode adjacent to the disabled electrode and an electrode next adjacent to the disabled electrode, where the performing electrical impedance imaging on the region to be measured based on the first excitation electrode group and the first measurement electrode group in this embodiment includes: and carrying out electrical impedance imaging on the area to be measured based on the first excitation electrode group, the first measurement electrode group and the second measurement electrode group.
In this embodiment, the 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: inputting an excitation signal as a first excitation signal from each of the first excitation electrode groups, acquiring an output signal corresponding to the first excitation signal from each of the first measurement electrode groups; inputting the excitation signal as a second excitation signal from each of the second excitation electrode groups, acquiring an output signal corresponding to the second excitation signal from each of the first measurement electrode groups; excluding signals not participating in imaging from the output signal corresponding to the first excitation signal and the output signal corresponding to the second excitation signal, obtaining effective imaging signals; and carrying out inversion on the effective imaging signals by adopting an image reconstruction algorithm to obtain an electrical impedance imaging result of the region to be detected.
In this embodiment, the signals that do not participate in imaging, of the output signal corresponding to the first excitation signal and the output signal corresponding to the second excitation signal, include: the self-excited self-measurement signal, the reciprocity-equivalent measurement signal, and the measurement signal for which the set of excitation measurement electrodes comprises a common electrode. The self-excitation self-measurement signal is particularly used for detecting the working state of the electrode.
Specifically, as shown in fig. 3, 4 and 5, the self-excited self-measurement signal 16 is a black square portion in the figure, i.e., the same portion of the excitation electrode set as the measurement electrode set; the reciprocity equivalent measuring signal is a symmetrical part at two sides of an oblique line formed by a black square frame in the figure, and in practical application, only the measuring signal at one side is taken; the measurement signal 15 of the excitation measurement electrode group including the common electrode is a white square portion to the right of the oblique line formed by the black square in the figure. The three measurement signals need to be excluded because they do not participate in imaging.
In this embodiment, the 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 includes: inputting an excitation signal from each electrode group in the first excitation electrode group, and collecting 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, and collecting 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 not participating in imaging from the first output signal and the second output signal to obtain effective imaging signals; and carrying out inversion on the effective imaging signal by adopting an image reconstruction algorithm to obtain an electrical impedance imaging result of the region to be detected.
FIG. 9 shows the results of electrical impedance imaging with an additional compensation scheme.
It should be noted that the technical solution provided by the present embodiment is not limited to a 16-electrode electrical impedance imaging system or a specific excitation measurement manner, and systems with different numbers of electrodes and compensation solutions under different excitation measurement manners that can be obtained without creative efforts are within the protection scope of the present invention.
Aiming at the technical problem of distortion of an electrical impedance imaging result caused by incapability of an electrode in the prior art, the invention provides two compensation schemes aiming at electrical impedance imaging: an overall compensation scheme and an additional compensation scheme. Wherein the overall compensation scheme is a replacement for the original measurement scheme and the additional compensation scheme is a supplement to the original measurement scheme or the overall compensation scheme. The overall compensation scheme is a reorganization of the original measurement scheme after disabling the electrodes, and is actually a popularization of the original measurement scheme when the number of the electrodes is reduced. Therefore, the overall compensation scheme can be correspondingly changed according to the electrode grouping rule and the serial number of the disabled electrode in the original measurement scheme, and the flexibility is high. The additional compensation scheme is a targeted compensation of the area near the disabled electrode. The additional compensation scheme can be split into a plurality of sub-schemes, and different sub-schemes can be used independently or in combination with each other.
According to the electrical impedance imaging method provided by the embodiment of the invention, when an incapability electrode exists in a plurality of electrodes of a region to be measured, the electrodes except the incapability electrode in the plurality of electrodes are grouped by adopting a preset electrode grouping interval to obtain a first electrode group set, the first electrode group set is simultaneously used as a first excitation electrode group and a first measurement electrode group, and then electrical impedance imaging is carried out on the region to be measured on the basis of the first excitation electrode group and the first measurement electrode group, so that under the condition that the incapability electrode exists, a system can automatically group the rest electrodes, and new electrical impedance imaging is carried out on the basis of an excitation measurement scheme obtained after grouping. Because the new electrical impedance imaging process excludes the disabling electrode, a more accurate imaging result can be obtained, and the technical problems in the prior art are effectively overcome. Namely, the technical scheme provided by the embodiment of the invention can still obtain a more accurate electrical impedance imaging result under the condition that the disabling electrode exists.
Example two
Correspondingly to the embodiment of the method, the invention also provides an electrical impedance imaging device which is applied to an electrical impedance imaging system, wherein the electrical impedance imaging system comprises a plurality of electrodes arranged in a region to be detected; as shown in fig. 10, the apparatus includes:
a grouping unit 201, configured to, when it is detected that a disabled electrode exists in the plurality of electrodes, group, by using a preset electrode grouping interval, electrodes, other than the disabled electrode, in the plurality of electrodes to obtain a first electrode group set;
a first excitation electrode group acquisition unit 202 configured to set the first electrode group as a first excitation electrode group;
a first measurement electrode group acquisition unit 203 for taking the first electrode group set as a first measurement electrode group;
an electrical impedance imaging unit 204, configured to perform electrical impedance imaging on the region to be measured based on the first excitation electrode set and the first measurement electrode set.
In this embodiment, the plurality of electrodes are arranged in a ring array in the region to be measured.
Further, the apparatus of this embodiment further includes:
a second excitation electrode group acquisition unit configured to obtain a second excitation electrode group based on an electrode adjacent to the disabled electrode and an electrode next adjacent to the disabled electrode when an electrode group composed of two adjacent electrodes of the disabled electrode is not included in the first electrode group set;
then, the electrical impedance imaging unit 204 of this embodiment is further configured to perform electrical impedance imaging on the region to be measured based on the first excitation electrode set, the second excitation electrode set, and the first measurement electrode set.
In this embodiment, the second excitation electrode group obtaining unit obtains the second excitation electrode group by:
combining the electrode adjacent to the disabled electrode and the electrode next adjacent to the disabled electrode according to a preset combination mode to obtain a second electrode group set;
any subset of the second set of electrode sets is taken as the second set of excitation electrodes.
In this embodiment, the electrical impedance imaging unit 204 includes:
a first excitation measuring unit for inputting an excitation signal as a first excitation signal from each of the first excitation electrode groups, and acquiring an output signal corresponding to the first excitation signal from each of the first measurement electrode groups;
a second excitation measuring unit for inputting the excitation signal as a second excitation signal from each of the second excitation electrode groups, and acquiring an output signal corresponding to the second excitation signal from each of the first measurement electrode groups;
a signal excluding unit configured to exclude a signal not participating in imaging from the output signal corresponding to the first excitation signal and the output signal corresponding to the second excitation signal, and obtain an effective imaging signal;
and the inversion unit is used for inverting the effective imaging signal by adopting an image reconstruction algorithm to obtain an electrical impedance imaging result of the region to be detected.
In this embodiment, the signals that do not participate in imaging, of the output signal corresponding to the first excitation signal and the output signal corresponding to the second excitation signal, include: the self-excited self-measurement signal, the reciprocity-equivalent measurement signal, and the measurement signal for which the set of excitation measurement electrodes comprises a common electrode.
Further, the apparatus of this embodiment further includes:
a second measurement electrode group acquisition unit configured to, when an electrode group composed of two adjacent electrodes of the disabled electrode is not included in the first electrode group set, obtain a second measurement electrode group based on an electrode adjacent to the disabled electrode and an electrode next adjacent to the disabled electrode;
then, the electrical impedance imaging unit 204 of this embodiment is further configured to perform electrical impedance imaging on the region to be measured based on the first excitation electrode set, the first measurement electrode set, and the second measurement electrode set.
The details of the working principle, the working flow and the like of the above-mentioned apparatus related to the specific embodiments can be referred to the specific embodiments of the electrical impedance imaging method provided by the present invention, and the details of the same technical contents are not described herein.
According to the electrical impedance imaging device provided by the embodiment of the invention, when an incapability electrode exists in a plurality of electrodes of a region to be measured, the electrodes except the incapability electrode in the plurality of electrodes are grouped by adopting a preset electrode grouping interval to obtain a first electrode group set, the first electrode group set is simultaneously used as a first excitation electrode group and a first measurement electrode group, and then electrical impedance imaging is carried out on the region to be measured on the basis of the first excitation electrode group and the first measurement electrode group, so that under the condition that the incapability electrode exists, a system can automatically group the rest electrodes, and new electrical impedance imaging is carried out on the basis of an excitation measurement scheme obtained after grouping. Because the new electrical impedance imaging process excludes the disabling electrode, a more accurate imaging result can be obtained, and the technical problems in the prior art are effectively overcome. Namely, the technical scheme provided by the embodiment of the invention can still obtain a more accurate electrical impedance imaging result under the condition that the disabling electrode exists.
EXAMPLE III
There is also provided, in accordance with an embodiment of the present invention, a storage medium having program code stored thereon, which when executed by a processor, implements an electrical impedance imaging method as in any one of the above embodiments.
Example four
There is also provided, according to an embodiment of the present invention, an electronic device including a memory, a processor, the memory having stored thereon program code executable on the processor, the program code, when executed by the processor, implementing an electrical impedance imaging method as claimed in any one of the above embodiments.
According to the electrical impedance imaging method, the electrical impedance imaging device, the storage medium and the electronic equipment, when the incapability electrode exists in the plurality of electrodes of the area to be measured, the electrodes except the incapability electrode in the plurality of electrodes are grouped by adopting the preset electrode grouping interval to obtain the first electrode group set, the first electrode group set is simultaneously used as the first excitation electrode group and the first measurement electrode group, and then electrical impedance imaging is carried out on the area to be measured on the basis of the first excitation electrode group and the first measurement electrode group, so that under the condition that the incapability electrode exists, a system can automatically group the rest electrodes, and new electrical impedance imaging is carried out on the basis of the excitation measurement scheme obtained after grouping. Because the new electrical impedance imaging process excludes the disabling electrode, a more accurate imaging result can be obtained, and the technical problems in the prior art are effectively overcome. Namely, the technical scheme provided by the embodiment of the invention can still obtain a more accurate electrical impedance imaging result under the condition that the disabling electrode exists.
The invention discloses an electrical impedance imaging method which can compensate images damaged due to incapability of electrodes in an electrical impedance imaging process. Aiming at the phenomenon that an electrical impedance imaging system can not work and can cause image distortion, two methods, namely an integral compensation scheme and an additional compensation scheme, are provided.
The scheme has the following advantages:
(1) the EIT image with the quality close to the normal quality can be output under the condition that the electrode fails, and the robustness of the EIT system is improved;
(2) the method has good expansibility and combinability, can be flexibly adjusted according to actual conditions, and can obtain a plurality of corresponding specific schemes based on two compensation ideas under different application backgrounds to compensate damaged images.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing an electronic device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An electrical impedance imaging method is applied to an electrical impedance imaging system, and the electrical impedance imaging system comprises a plurality of electrodes arranged in a region to be measured; characterized in that the method comprises:
when detecting that an incapacitated electrode exists in the plurality of electrodes, grouping the electrodes except the incapacitated electrode in the plurality of electrodes by adopting a preset electrode grouping interval to obtain a first electrode group set;
taking the first set of electrode groups as a first set of excitation electrodes;
taking the first set of electrode sets as a first set of measurement electrodes;
and carrying out electrical impedance imaging on the area to be measured based on the first excitation electrode group and the first measuring electrode group.
2. The electrical impedance imaging method of claim 1, wherein the plurality of electrodes are arranged in an annular array over the region to be measured.
3. The electrical impedance imaging method of claim 2, wherein when an electrode set consisting of two adjacent electrodes of the disabled electrode is not included in the first set of electrode sets, the method further comprises:
obtaining a second set of energized electrodes based on an electrode adjacent to the de-energized electrode and an electrode next adjacent to the de-energized electrode;
the electrical impedance imaging of the region to be measured based on the first excitation electrode group and the first measurement electrode group comprises:
and 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.
4. A method of electrical impedance imaging according to claim 3, wherein said obtaining a second set of excitation electrodes based on electrodes adjacent to said disabled electrode and electrodes next adjacent to said disabled electrode comprises:
combining the electrode adjacent to the disabled electrode and the electrode next adjacent to the disabled electrode according to a preset combination mode to obtain a second electrode group set;
any subset of the second set of electrode sets is taken as the second set of excitation electrodes.
5. An electrical impedance imaging method according to claim 3, wherein said electrical impedance imaging the region to be measured based on the first excitation electrode set, the second excitation electrode set and the first measurement electrode set comprises:
inputting an excitation signal as a first excitation signal from each of the first excitation electrode groups, acquiring an output signal corresponding to the first excitation signal from each of the first measurement electrode groups;
inputting the excitation signal as a second excitation signal from each of the second excitation electrode groups, acquiring an output signal corresponding to the second excitation signal from each of the first measurement electrode groups;
excluding signals not participating in imaging from the output signal corresponding to the first excitation signal and the output signal corresponding to the second excitation signal, obtaining effective imaging signals;
and carrying out inversion on the effective imaging signals by adopting an image reconstruction algorithm to obtain an electrical impedance imaging result of the region to be detected.
6. The electrical impedance imaging method of claim 5, wherein the signals of the output signal corresponding to the first excitation signal and the output signal corresponding to the second excitation signal that do not participate in imaging comprise: the self-exciting self-measuring signal, the reciprocity equivalent measuring signal and the exciting measuring electrode group comprise measuring signals of a common electrode.
7. The electrical impedance imaging method of claim 2, wherein when an electrode set consisting of two adjacent electrodes of the disabled electrode is not included in the first set of electrode sets, the method further comprises:
obtaining a second set of measurement electrodes based on an electrode adjacent to the disabled electrode and an electrode next adjacent to the disabled electrode;
the electrical impedance imaging of the region to be measured based on the first excitation electrode group and the first measurement electrode group comprises:
and carrying out electrical impedance imaging on the area to be measured based on the first excitation electrode group, the first measurement electrode group and the second measurement electrode group.
8. An electrical impedance imaging device is applied to an electrical impedance imaging system, and the electrical impedance imaging system comprises a plurality of electrodes arranged in a region to be measured; characterized in that the device comprises:
the grouping unit is used for grouping the electrodes except for the disabled electrodes in the plurality of electrodes by adopting a preset electrode grouping interval when the disabled electrodes are detected to exist in the plurality of electrodes, so as to obtain a first electrode group set;
a first excitation electrode group acquisition unit configured to take the first electrode group set as a first excitation electrode group;
a first measurement electrode group acquisition unit configured to take the first electrode group set as a first measurement electrode group;
and the electrical impedance imaging unit is used for carrying out electrical impedance imaging on the region to be measured based on the first excitation electrode group and the first measurement electrode group.
9. A storage medium having program code stored thereon, the program code realizing the electrical impedance imaging method according to any one of claims 1 to 7 when executed by a processor.
10. An electronic device, characterized in that the electronic device comprises a memory, a processor, the memory having stored thereon program code executable on the processor, the program code, when executed by the processor, implementing an electrical impedance imaging method according to any one of claims 1 to 7.
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| CN202210300467.2A CN114711746A (en) | 2022-03-24 | 2022-03-24 | Electrical impedance imaging method, electrical impedance imaging device, storage medium, and electronic apparatus |
| PCT/CN2023/079241 WO2023179326A1 (en) | 2022-03-24 | 2023-03-02 | Electrical impedance tomography method and apparatus, storage medium, and electronic device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023179326A1 (en) * | 2022-03-24 | 2023-09-28 | 北京华睿博视医学影像技术有限公司 | Electrical impedance tomography method and apparatus, storage medium, and electronic device |
| WO2024032722A1 (en) * | 2022-08-11 | 2024-02-15 | 芯海科技（深圳）股份有限公司 | Contact impedance measurement circuit and method, detection apparatus, chip, and electronic device |
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| GB9226376D0 (en) * | 1992-12-18 | 1993-02-10 | British Tech Group | Tomography |
| DE102011014107B4 (en) * | 2011-03-16 | 2021-09-30 | Drägerwerk AG & Co. KGaA | Method for the identification of a defective electrode in electroimpedance tomography |
| DE102011018505B4 (en) * | 2011-04-23 | 2021-06-24 | Drägerwerk AG & Co. KGaA | Device for electroimpedance tomography |
| CN103040466B (en) * | 2013-01-08 | 2014-07-30 | 中国人民解放军第四军医大学 | Abnormal electrode connection detecting method for impedance detection |
| DE102016014251B4 (en) * | 2016-11-30 | 2023-02-02 | Drägerwerk AG & Co. KGaA | Device and method for determining an axial position of an electrode arrangement for electro-impedance tomography |
| JP7179552B2 (en) * | 2018-09-26 | 2022-11-29 | 日置電機株式会社 | Processing equipment and processing method |
| CN109864712A (en) * | 2019-04-02 | 2019-06-11 | 北京华睿博视医学影像技术有限公司 | Electrical impedance imaging device and method |
| CN112043271B (en) * | 2020-09-21 | 2023-12-26 | 北京华睿博视医学影像技术有限公司 | Electrical impedance measurement data correction method and device |
| CN113533439B (en) * | 2021-06-25 | 2022-09-02 | 中国农业大学 | Electrical impedance imaging method and system for corn ear moisture distribution and electronic equipment |
| CN114711746A (en) * | 2022-03-24 | 2022-07-08 | 北京华睿博视医学影像技术有限公司 | Electrical impedance imaging method, electrical impedance imaging device, storage medium, and electronic apparatus |
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| WO2023179326A1 (en) * | 2022-03-24 | 2023-09-28 | 北京华睿博视医学影像技术有限公司 | Electrical impedance tomography method and apparatus, storage medium, and electronic device |
| WO2024032722A1 (en) * | 2022-08-11 | 2024-02-15 | 芯海科技（深圳）股份有限公司 | Contact impedance measurement circuit and method, detection apparatus, chip, and electronic device |
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