CN108836331A - A kind of method and system obtaining conductivity imaging by magnetic approach - Google Patents

Abstract

The invention discloses a kind of method and systems that conductivity imaging is obtained by magnetic approach, and this approach includes the following steps：The array of particular order, the detection sensor of horizontal homogeneous distribution are uniformly placed around it according to the shape of imaging body；For detecting the magnetic induction intensity of imaging body data collection；Obtained magnetic induction intensity data carry out conductivity reconstruction to imaging body using sensitivity matrix, obtain imaging body internal conductance rate distributed image.The system includes：The detection supporter that object to be detected can be placed can receive, handle the computer of data according to the specific array detection sensor of imaging shape placement and one on supporter.The present invention realizes to obtain the purpose of higher resolution conductivity reconstruction image and placing the detection sensor of different arrays outside imaging body.

Description

A method and system for obtaining conductivity images by means of a magnetic field

technical field

The invention relates to the field of biomedical electromagnetic imaging, in particular to a method and system for obtaining conductivity images through a magnetic field.

Background technique

Electrical Impedance Tomography (EIT, Electrical Impedance Tomography) is a new type of medical functional imaging technology. Its basic principle is that different tissues in the human body have different resistance/conductivity under different physiological and pathological conditions. Methods Apply a safe driving current/voltage to the human body, detect the voltage values on the detection electrodes at other positions, and reconstruct the image of the resistivity distribution or its change inside the human body according to the relationship between voltage and current. This technique can be applied to distinguish between two substances with large differences in conductivity but close in location.

MDEIT is an incomplete contact imaging method. A large amount of magnetic field measurement data can be obtained around the object to be measured by measuring devices such as measuring coils, which avoids the interference caused by contact measurement on the electromagnetic information generated by the imaging object, thereby reducing the contact electrode. The effect on the imaging resolution can greatly improve the image reconstruction quality effect. Therefore, magnetic detection electrical impedance imaging has higher anti-interference and image resolution, and can be well applied in medical imaging.

Contents of the invention

The present invention proposes a method and system for obtaining a conductivity image by means of a magnetic field, which enriches the amount of information for measuring the magnetic field distribution, overcomes the error caused by the contact between the electrode and the imaging body in the conductivity imaging, and improves the conductivity imaging. The problem of low resolution increases the resolution of image reconstruction.

The technical implementation of the present invention is described in detail below:

A method and system for obtaining a conductivity image by means of a magnetic field. The method is to detect the magnetic induction intensity around an imaging object according to a magnetic field sensor; the obtained magnetic induction intensity data is used to reconstruct the imaging object through a sensitivity matrix equation, and the internal conductance of the imaging object is obtained. Rate distribution image. The method is characterized in that the sensitivity matrix is obtained using a numerical calculation method or an analytical method; the sensitivity matrix is stored in a storage device, and can be directly invoked for reconstruction as long as the shape of the imaging object remains unchanged. The system includes a detection shelf that can place the detected object, a detection sensor placed on the shelf according to the shape of the imaging object, and a computer that can receive and process data. The system is characterized in that a fixed detector array is placed around the imaging body on the shelf, and the detector and the imaging body are kept relatively static to detect the magnetic induction intensity around the imaging body; the system detects that the detector is placed at a specific position on the shelf, The imaging object keeps still and rotates the detector to scan and detect the surrounding magnetic induction intensity.

The beneficial effects of the technical solution provided by the invention are:

The invention provides a method and system for obtaining a conductivity image by means of a magnetic field. The invention uses a sensitivity matrix equation to reconstruct the reconstruction object to obtain the internal conductivity distribution of the imaging object. The present invention enriches the amount of information for measuring the magnetic field distribution through different array detectors, and performs imaging in a non-contact magnetic detection mode, which overcomes the error caused by the contact between the electrode and the imaging body in the conductivity imaging, and improves the resolution of the conductivity image reconstruction , and the sensitivity matrix that can be called directly reduces the reconstruction time and improves the reconstruction efficiency.

Description of drawings

Fig. 1 is a flow chart of a method for obtaining a conductivity image by means of a magnetic field provided by the present invention;

Fig. 2 is a schematic structural diagram of a system for obtaining a conductivity image by means of a magnetic field provided by the present invention;

Fig. 3 is the implementation schematic diagram of the present invention;

Fig. 4 is the implementation schematic diagram of the present invention;

Fig. 5 is the implementation schematic diagram of the present invention;

Detailed ways:

In order to make the object, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

In order to improve the resolution of conductivity imaging, the present invention provides and implements a method and system for obtaining conductivity images by means of a magnetic field. See Figure 1 and Figure 2 for schematic diagrams, and see the description below for details:

A method for obtaining a conductivity image by means of a magnetic field, comprising the following steps:

Step 101: according to the shape of the imaging body, evenly place arrays in a specific order around it, and detect sensors evenly distributed horizontally;

Step 102: Measure the magnetic induction intensity around the imaging object;

Step 103: using the sensitivity matrix equation to reconstruct the electrical conductivity of the imaging body from the obtained magnetic induction data;

Step 104: Solving the sensitivity matrix equation to obtain an image of the conductivity distribution inside the imaging body.

Specifically, in step 101, if the cross-section of the imaging body is square, the detection sensor is placed around the imaging body in a square track, as shown in Figure 3; if the cross-section of the imaging body is circular, the detection sensor is Circular trajectories are arranged around the imaging body, as shown in Figure 4;

A system 105 for obtaining a conductivity image by means of a magnetic field, comprising the following parts:

Module 106: a detection rack that can place the detected object;

Module 107: a specific array of detection sensors placed on the shelf according to the shape of the imaging body and evenly distributed laterally;

Module 108: A computer capable of receiving and processing data.

Specifically, in module 107, the detector and the imaging body can be kept relatively stationary to measure the magnetic induction; or the position of the detection sensor can be fixed, and the imaging body can be rotated to detect the magnetic induction in a scanning manner. As shown in Figures 3, 4, and 5.

Those skilled in the art can understand that the accompanying drawing is only a schematic diagram of a preferred embodiment, and the serial numbers of the above-mentioned embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (6)

1. A method for obtaining a conductivity image by means of a magnetic field, characterized in that the magnetic induction intensity around the imaging body object is detected according to a magnetic field sensor; the magnetic induction intensity data obtained reconstructs the imaging object through a sensitivity matrix equation, and obtains the internal conductance of the imaging body Rate distribution image. 2. A method for obtaining a conductivity image by means of a magnetic field according to claim 1, wherein the sensitivity matrix is obtained using a numerical calculation method or an analytical method. 3. A method for obtaining a conductivity image by means of a magnetic field according to claim 1, wherein the sensitivity matrix is stored in a storage device, and can be directly invoked for reconstruction as long as the shape of the imaging object remains unchanged. 4. A system for obtaining conductivity images by means of a magnetic field, which is characterized in that a detection rack that can place the object to be detected, a detection sensor placed on the rack according to the shape of the imaging object, and a device that can receive and process data computer. 5. A system for obtaining conductivity images by means of a magnetic field according to claim 4, wherein a fixed detector array is placed around the imaging object on the shelf to keep the detector and the imaging object relatively stationary. Variable detection of magnetic induction around the imaging body. 6. A system for obtaining conductivity images by means of a magnetic field according to claim 4, characterized in that the system detects that the detector is placed at a specific position on the rack, and the imaging object remains stationary and rotates the detector to scan and detect the surroundings Magnetic induction.