KR-102962836-B1 - Apparatus and Method for optimizing physical property values for each volume of homogeneous physical properties in a 3D object

KR102962836B1KR 102962836 B1KR102962836 B1KR 102962836B1KR-102962836-B1

Abstract

An apparatus for optimizing physical property values by volume of homogeneous properties of a three-dimensional object according to an embodiment of the present invention, the apparatus for optimizing physical property values, which are inherent properties of a material, for a three-dimensional object, comprises: a homogeneous property volume division unit that divides the three-dimensional object into homogeneous property volumes in which physical properties are distinguished; a physical property initial value assignment unit that assigns an initial physical property value to each divided volume; an electrode placement unit that places a plurality of electrodes on the surface of the three-dimensional object; a measurement condition setting unit that sets at least one of a voltage and a current applied to the plurality of placed electrodes; a measurement result derivation unit that applies at least one of a voltage and a current to the plurality of electrodes according to the setting of the measurement condition setting unit and measures at least one of the voltage and a current generated in the plurality of electrodes; and a volume-specific physical property value optimization unit that performs a simulation according to the same conditions as the electrode placement unit and the measurement condition setting unit and determines physical property values by volume to minimize the difference between the measured value of the measurement result derivation unit and the simulation value. After dividing a 3D object into homogeneous material property volumes, it has the effect of deriving optimized material property values for each homogeneous material property volume.

Inventors

김종현
박상민

Assignees

주식회사 필드큐어

Dates

Publication Date: 20260511
Application Date: 20230908
Priority Date: 20220916

Claims (20)

In an apparatus for optimizing physical property values, which are inherent properties of a material, for a three-dimensional object, A homogeneous property volume division unit that divides the above three-dimensional object into homogeneous property volumes in which the physical properties are distinguished; A material property initial value assignment unit that assigns a material property initial value to each of the above-mentioned divided volumes; An electrode placement unit for placing a plurality of electrodes on the surface of the above-mentioned three-dimensional object; A measurement condition setting unit for setting at least one of the voltage and current applied to the plurality of electrodes arranged above; A measurement result derivation unit that applies at least one of a voltage and a current to the plurality of electrodes according to the setting of the measurement condition setting unit and measures at least one of the voltage and current generated in the plurality of electrodes; and A volume-specific physical property value optimization unit that performs a simulation according to the same conditions as the electrode placement unit and the measurement condition setting unit, and determines the volume-specific physical property value to minimize the difference between the measurement value of the measurement result derivation unit and the simulation execution value; Device for optimizing material property values by volume of homogeneous material properties of a three-dimensional object including
In paragraph 1, The above volume-specific material property value optimization unit A volume selection module for selecting at least one volume to optimize physical property values among the plurality of volumes above; and A volume physical property value determination module that determines the physical property value of the selected volume by optimizing the physical property value of the selected volume to minimize the difference between the measured value of the measurement result derivation unit and the simulation execution value. An apparatus for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object, characterized by the following.
In paragraph 1, The above homogeneous material volume division part Receiving a medical image of the above 3D object, extracting the outline of the object based on the received medical image, and dividing the 3D object into homogeneous property volumes in which the physical properties are distinguished. An apparatus for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object, characterized by the following.
In paragraph 1, The above homogeneous material volume division part Receiving medical image information divided by homogeneous property volumes in which the above physical properties are distinguished An apparatus for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object, characterized by the following.
In paragraph 1, When a voltage is applied to the plurality of electrodes according to the setting in the above measurement result derivation unit, the current flowing through the plurality of electrodes is measured. An apparatus for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object, characterized by the following.
In paragraph 1, When current is applied to the plurality of electrodes according to the setting in the above measurement result derivation unit, the voltage across the plurality of electrodes is measured. An apparatus for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object, characterized by the following.
In paragraph 1, In the above-mentioned initial physical property value allocation section The initial physical property value assigned to each of the above-mentioned divided volumes is either the electrical physical property value measured by the conductivity measurement method or the electrical physical property value known in advance according to human tissue. An apparatus for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object, characterized by the following.
In paragraph 1, In the above homogeneous material volume division section Dividing the above three-dimensional object into homogeneous physical property volumes in which the physical properties are distinguished is Segmenting into anatomical volumes using at least one of magnetic resonance imaging (MRI) and computed tomography (CT). An apparatus for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object, characterized by the following.
In paragraph 8, The above anatomical volume comprises at least one of the skin, skull, white matter, gray matter of the mammalian brain, multiple internal organs of the mammalian chest and abdomen, bone, muscle, and fat. An apparatus for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object, characterized by the following.
In paragraph 1, The above volume-specific material properties are at least one of electrical conductivity and permittivity. An apparatus for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object, characterized by the following.
In paragraph 2, In the above volume-specific material property value optimization unit Minimizing the difference between the measured value of the above measurement result derivation unit and the above simulation execution value is The material property value of the selected volume is determined by repeatedly performing simulations while varying the material property value assigned to the selected volume, using a nonlinear-least square method that calculates the minimum mean square error between the measured value of the measurement result derivation unit and the simulation execution value. An apparatus for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object, characterized by the following.
In paragraph 1, The method further includes a sub-volume-specific material property value optimization unit that divides the volume into a plurality of sub-volumes and optimizes the material property values for each sub-volume using the material property values for each volume determined by the volume-specific material property value optimization unit. An apparatus for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object, characterized by the following.
In Paragraph 12, The above sub-volume-specific material property value optimization unit For each volume in which the above-mentioned physical property value is determined, a sub-volume selection module for selecting at least one sub-volume to optimize the physical property value; and A sub-volume physical property value determination module that determines the physical property value of the selected sub-volume by optimizing the physical property value of the selected sub-volume to minimize the difference between the measured value of the measurement result derivation unit and the simulation execution value. An apparatus for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object, characterized by the following.
In Paragraph 12, In the above sub-volume-specific material property value optimization unit The above subvolume is at least one voxel forming a hexahedron. An apparatus for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object, characterized by the following.
In Paragraph 12, The above material property values for each subvolume are at least one of electrical conductivity and permittivity. An apparatus for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object, characterized by the following.
In Paragraph 13, The above sub-volume-specific material property value optimization unit Minimizing the difference between the measured value of the above measurement result derivation unit and the above simulation execution value is The material property value of the selected sub-volume is determined by repeatedly performing simulations while varying the material property value assigned to the selected sub-volume, using a nonlinear-least square method that calculates the minimum mean square error between the measured value of the measurement result derivation unit and the simulation execution value. An apparatus for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object, characterized by the following.
For a three-dimensional object, in a method for optimizing physical property values, which are intrinsic properties of the material, A homogeneous property volume division step for dividing the above three-dimensional object into homogeneous property volumes in which the physical properties are distinguished; A step for assigning initial physical property values to each of the above-mentioned divided volumes; An electrode placement step of placing a plurality of electrodes on the surface of the above-mentioned three-dimensional object; A measurement condition setting step for setting at least one of the voltage and current applied to the plurality of electrodes arranged above; A measurement result derivation step of applying at least one of a voltage and a current to the plurality of electrodes according to the setting of the measurement condition setting step, and measuring at least one of the voltage and current generated in the plurality of electrodes; and A volume-specific physical property value optimization step that performs a simulation according to the same conditions as the electrode placement step and measurement condition setting step, and determines the volume-specific physical property value to minimize the difference between the measured value of the measurement result derivation step and the simulation value; A method for optimizing material property values by volume of homogeneous material properties of a three-dimensional object including
In Paragraph 17, The above volume-specific material property value optimization step is A volume selection process for selecting at least one volume to optimize physical property values among the plurality of volumes above; and A volume property value determination process comprising: determining the physical property value of the selected volume by optimizing the physical property value of the selected volume to minimize the difference between the measured value of the measurement result derivation step and the simulation execution value. A method for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object, characterized by the following.
In Paragraph 17, A sub-volume property value optimization step further comprising: dividing the volume into a plurality of sub-volumes and optimizing the sub-volume property values using the volume-specific property values determined in the volume-specific property value optimization step; A method for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object, characterized by the following.
In Paragraph 19, The above sub-volume-specific material property value optimization step is For each volume in which the above-mentioned physical property value is determined, a sub-volume selection process for selecting at least one sub-volume to optimize the physical property value; and A sub-volume physical property value determination process for determining the physical property value of the selected sub-volume by optimizing the physical property value of the selected sub-volume to minimize the difference between the measured value of the measurement result derivation step and the simulation execution value; A method for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object, characterized by the following.

Description

Apparatus and Method for optimizing physical property values for each volume of homogeneous physical properties in a 3D object The present invention relates to an apparatus and method for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object, and more specifically, to an apparatus and method for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object, which can derive optimized physical property values by volume of homogeneous physical properties after dividing the three-dimensional object by volume of homogeneous physical properties. Generally, bioelectrical impedance analysis is a method of examining body composition by passing a minute current through electrodes attached to the body and measuring the voltage to determine the value of the change in electrical signals (bioelectric impedance value) caused by cell membranes and tissues. It is mainly used to examine the health status of the body, such as muscle, fat, cells, body mass, basal metabolic rate, body water, metabolic activity, bone minerals, and plasma. Electrical Impedance Tomography (EIT) is used to visualize physiological functions such as respiration and blood flow by attaching multiple electrodes to the body and repeatedly injecting current and measuring voltage to reconstruct the impedance distribution of a cross-section of the body into an image. In these EIT tests, measurements are taken by having the subject wear a vest- or belt-type device equipped with multiple EIT electrodes. Accordingly, there has been a recent trend of steadily conducting various studies utilizing EIT electrodes to improve the convenience and reliability of electrical impedance imaging of subjects. However, because the object has a complex structure, measuring the three-dimensional physical distribution with sufficient resolution remains very difficult despite various academic efforts, and it can be seen that there is a need to simplify the object using a realistic approach. Therefore, to solve this problem, there is a need for a method to optimize electrical physical properties based on tissue type or electrical physical properties based on the same volume. FIG. 1 is a drawing illustrating an apparatus for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a method for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object according to another embodiment of the present invention. FIG. 3 is a diagram illustrating the volume-by-volume property value optimization step in a method for optimizing the property value by volume of homogeneous properties of a three-dimensional object according to another embodiment of the present invention. FIG. 4 is a diagram illustrating the sub-volume property value optimization step in the method for optimizing property values by volume of homogeneous properties of a three-dimensional object according to another embodiment of the present invention. FIG. 5 is a diagram illustrating a method for dividing a specific volume into a plurality of sub-volumes in a method for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object according to another embodiment of the present invention, and shows a cross-section of a specific volume. FIG. 6 is a configuration diagram of a device for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object according to another embodiment of the present invention. FIG. 7 is a flowchart of a method for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object according to another embodiment of the present invention. FIG. 8 illustrates a detailed view of a model divided into tissue types in an optimization device for material properties by volume of homogeneous material properties of a three-dimensional object according to another embodiment of the present invention. FIG. 9 illustrates an apparatus for optimizing physical property values by volume of homogeneous physical properties of a three-dimensional object according to another embodiment of the present invention, wherein (A) shows the names of each face (A1 to A4), and (B) shows the names of individual electrodes of each face. (C) shows an electrode to which current is applied to an object and an electrode that measures the voltage at that time. FIG. 10 illustrates data measurement and reconstruction based on electrical properties through a 3D model in a device for optimizing material properties by volume of homogeneous material properties of a three-dimensional object according to another embodiment of the present invention. FIG. 11 illustrates a method for optimizing physical property values b