A tomographic image reconstruction method, Lorentz force imaging equipment and device

Abstract

The embodiment of the present invention discloses a tomographic image reconstruction method, a Lorentz force imaging device and an apparatus. The tomographic image reconstruction method includes: obtaining a Lorentz force signal acquired by a Lorentz force imaging device, and distance information from a scanned object acquired during the signal acquisition process; determining the outer contour of the scanned object based on the distance information; creating data to be reconstructed, wherein the data to be reconstructed includes pending parameters corresponding to the scanning space, updating the data to be reconstructed based on the outer contour of the scanned object, and performing image reconstruction based on the updated data to be reconstructed. By setting the pending parameters corresponding to the range outside the outer contour of the scanned object in the data to be reconstructed to preset parameter values, the number of pending parameters is reduced, thereby reducing the amount of calculation for image reconstruction and improving the efficiency of image reconstruction.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of medical imaging equipment, and in particular to a tomographic image reconstruction method, a Lorentz force imaging device and an apparatus. Background Art

[0002] Modern medical research shows that images reflecting the electrical properties of biological tissues are of great significance in the early diagnosis of diseases.

[0003] Lorentz force imaging is a non-invasive electrical functional imaging method based on the Hall effect. Direct current is injected into the imaging object using electrodes, and the Lorentz force signal is collected through the pressure sensor. The Lorentz force reflects the electrical properties of the object.

[0004] Computer tomography is an important medical imaging technology. By extracting Lorentz force signals at different angles using a phase-locked amplification detection method, the conductivity tomographic distribution of the sound source can be imaged. Summary of the invention

[0005] The embodiments of the present invention provide a tomographic image reconstruction method, a Lorentz force imaging device and an apparatus, so as to simplify the tomographic image reconstruction process by acquiring a Lorentz force signal and a distance signal from a scanned object.

[0006] In a first aspect, an embodiment of the present invention provides a tomographic image reconstruction method, comprising:

[0007] Acquire the distance information from the outer contour of the scanned object collected by the distance detector, and acquire the Lorentz force signal collected by the Lorentz force imaging device;

[0008] Determining the outer contour of the scanned object based on the distance information to the outer contour of the scanned object;

[0009] Creating data to be reconstructed, wherein the data to be reconstructed includes undetermined parameters corresponding to the scanning space;

[0010] In the data to be reconstructed, the undetermined parameters corresponding to the range outside the outer contour of the scanned object are set as preset parameter values, and the undetermined parameters in the range within the outer contour of the scanned object are retained;

[0011] The image is reconstructed based on the updated data to be reconstructed.

[0012] In a second aspect, an embodiment of the present invention further provides a tomographic image reconstruction device, comprising:

[0013] An information acquisition module, used to acquire distance information from an outer contour of a scanned object acquired by a distance detector, and to acquire a Lorentz force signal acquired by a Lorentz force imaging device;

[0014] An outer contour determining module, configured to determine the outer contour of the scanned object based on the distance information from the outer contour of the scanned object;

[0015] A data updating module, used for creating data to be reconstructed, wherein the data to be reconstructed includes pending parameters corresponding to the scanning space, setting the pending parameters corresponding to the range outside the outer contour of the scanned object in the data to be reconstructed to preset parameter values, and retaining the pending parameters within the range within the outer contour of the scanned object;

[0016] The image reconstruction module is used to reconstruct the image based on the updated data to be reconstructed.

[0017] In a third aspect, an embodiment of the present invention further provides a Lorentz force imaging device, comprising: a fixing device, an electrode, a magnet, a signal acquisition device, a distance detector and a transmission scanning device; wherein,

[0018] The electrode is a hollow structure, and the hollow space in the electrode is used to accommodate the scanned object;

[0019] The fixing device is arranged at both ends of the electrode, and is used to fix the scanning object passing through the electrode;

[0020] The transmission scanning device is used to carry the magnet, the signal acquisition device and the distance detector, the magnet is used to form a magnetic field, and the scanning object forms a Lorentz force signal in the electric field formed by the magnetic field and the electrode;

[0021] The distance detector is used to collect distance information from the outer contour of the scanned object;

[0022] The signal acquisition device is used to acquire the Lorentz force signal in the space where the scanned object is located, and the Lorentz force signal and the distance information are used to reconstruct a tomographic image of the scanned object.

[0023] In a fourth aspect, an embodiment of the present disclosure further provides an electronic device, the electronic device comprising:

[0024] one or more processors;

[0025] a storage device for storing one or more programs,

[0026] When the one or more programs are executed by the one or more processors, the one or more processors implement the tomographic image reconstruction method as described in any one of the embodiments of the present disclosure.

[0027] In a fifth aspect, the embodiments of the present disclosure further provide a storage medium comprising computer executable instructions, which, when executed by a computer processor, are used to perform the tomographic image reconstruction method as described in any one of the embodiments of the present disclosure.

[0028] The technical solution of this embodiment determines the outer contour of the scanned object by detecting the distance information from the outer contour of the scanned object during the acquisition of the Lorentz force signal, and sets the pending parameters corresponding to the range outside the outer contour of the scanned object in the data to be reconstructed to preset parameter values, thereby reducing the number of pending parameters and further reducing the calculation amount of image reconstruction, thereby speeding up the efficiency of image reconstruction. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic flow chart of a tomographic image reconstruction method provided by an embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of a scanning space provided by an embodiment of the present invention;

[0031] Figure 3 is a schematic diagram of the distribution of data to be reconstructed provided by an embodiment of the present invention;

[0032] Figure 4 is a schematic diagram of distribution of processed data to be reconstructed provided by an embodiment of the present invention;

[0033] Figure 5 is a structural schematic diagram of a tomographic image reconstruction device provided by an embodiment of the present invention;

[0034] Figure 6 A schematic structural diagram of a Lorentz force imaging device provided by an embodiment of the present invention;

[0035] Figure 7 is a schematic diagram of a shielding device provided by an embodiment of the present invention;

[0036] Figure 8 It is a structural schematic diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0038] Figure 1A schematic flow chart of a tomographic image reconstruction method provided in an embodiment of the present invention is provided, and the tomographic image reconstruction method is used to reconstruct the Lorentz force signal and distance information acquired by the Lorentz force imaging device provided in the above embodiment to obtain a tomographic image of the scanned object. The method can be executed by a tomographic image reconstruction device provided in an embodiment of the present invention, and the tomographic image reconstruction device is implemented by software and / or hardware, and the tomographic image reconstruction device can be integrated in an electronic device such as a computer. The method includes the following steps:

[0039] S10, obtaining distance information from an outer contour of a scanned object collected by a distance detector, and obtaining a Lorentz force signal collected by a Lorentz force imaging device.

[0040] S20: Determine the outer contour of the scanned object based on the distance information to the outer contour of the scanned object.

[0041] S30: Create data to be reconstructed, wherein the data to be reconstructed includes undetermined parameters corresponding to the scanning space, wherein the data to be reconstructed includes undetermined parameters corresponding to the scanning space.

[0042] S40, setting the undetermined parameters corresponding to the range outside the outer contour of the scanned object in the data to be reconstructed to preset parameter values, and retaining the undetermined parameters in the range within the outer contour of the scanned object; and performing image reconstruction based on the updated data to be reconstructed.

[0043] Among them, the distance information from the outer contour of the scanned object can be detected by a distance detector in the Lorentz force imaging device, and the distance information can be set with a position tag, which can include scanning layer information and scanning angle information, for example, it can be in the form of AB, where A is the scanning layer information and B is the scanning angle information.

[0044] The outer contour of the scanned object can be formed by the position tags corresponding to each distance information. Specifically, based on the scanning layer information and scanning angle information in the position tags, as well as the distance information, the edge points corresponding to the position tags are determined, and the edge points corresponding to the position tags are combined (for example, adjacent edge points can be connected) to obtain the outer contour of the scanned object.

[0045] Creating the data to be reconstructed may be creating a three-dimensional matrix, wherein the three-dimensional matrix includes the undetermined parameters. The data to be reconstructed may be determined based on the scanning space and the reconstruction granularity, for example, the data to be reconstructed may be a matrix of m*n*l, wherein m*n is the number of undetermined parameters for each scanning layer, and l is the number of scanning layers. Image reconstruction is performed based on the Lorentz force signal, and the value of each undetermined parameter in the three-dimensional matrix is ​​determined to obtain a reconstructed image.

[0046] In this embodiment, the data to be reconstructed is updated by determining the outer contour of the scanned object, thereby reducing the number of undetermined parameters in the data to be reconstructed and improving the efficiency of image reconstruction.

[0047] Updating the data to be reconstructed based on the outer contour of the scanned object includes: setting the undetermined parameters corresponding to the range outside the outer contour of the scanned object in the data to be reconstructed to preset parameter values, and retaining the undetermined parameters in the range within the outer contour of the scanned object.

[0048] According to the outer contour of the scanned object, the range outside the outer contour of the scanned object is the environment range, that is, air, and the undetermined parameters corresponding to the range outside the outer contour of the scanned object are set to the preset parameter values. By setting the undetermined data of the range outside the outer contour of the scanned object to the determined data, the amount of data calculation in the reconstruction process is reduced, and the image reconstruction process is accelerated. Among them, the preset parameter value can be 0. By setting the undetermined data of the range outside the outer contour of the scanned object to 0, the number of unknown numbers is reduced in the interpolation operation in the reconstruction process, the interpolation accuracy is improved, and at the same time, the situation of interference such as noise formed in the range outside the outer contour of the scanned object during the reconstruction process is avoided, thereby improving the quality of the reconstructed image.

[0049] For the updated data to be reconstructed, the Lorentz force signal is subjected to image reconstruction processing based on a preset image reconstruction rule (such as an inverse Laden transform algorithm) to obtain a reconstructed image.

[0050] For example, see Figure 2 , Figure 2 is a schematic diagram of a scanning space provided by an embodiment of the present invention. In this embodiment, by creating data to be reconstructed, each data in the data to be reconstructed is determined to obtain a reconstructed tomographic image, wherein each granularity (e.g. Figure 1 The data of the cells in the image are all pending data and need to be reconstructed based on the collected Lorentz force signal. Correspondingly, the corresponding relationship between each data in the data to be reconstructed and the scanning space can be found in Figure 3 , Figure 3 is a schematic diagram of the distribution of the data to be reconstructed provided by an embodiment of the present invention. Accordingly, the data to be reconstructed may be:

[0051]

[0052] Among them, x is the reconstruction matrix data corresponding to the subscript (m,n), is the discretized result of Fourier transform of the integral value of the summation curve, and p is the slope of the curve curvature.

[0053] Figure 2 The solid line in is the outer contour of the scanned object, which can be determined based on the distance information collected from the surface of the scanned object. Figure 2It can be seen that the pending data within the outer contour range is the data of the scanned object that needs to be reconstructed. The data outside the outer contour range does not belong to the scanned object and is air. By setting the pending data outside the outer contour range to 0, the amount of data that needs to be reconstructed and the computing power of the reconstruction process are reduced. Figure 4 , Figure 4 It is a distribution diagram of the processed data to be reconstructed provided by an embodiment of the present invention.

[0054] Correspondingly, the data to be reconstructed can be:

[0055] The technical solution of this embodiment determines the outer contour of the scanned object by detecting the distance information from the outer contour of the scanned object during the acquisition of the Lorentz force signal, and sets the pending parameters corresponding to the range outside the outer contour of the scanned object in the data to be reconstructed to preset parameter values, thereby reducing the number of pending parameters and further reducing the calculation amount of image reconstruction, thereby speeding up the efficiency of image reconstruction.

[0056] Figure 5 : is a schematic structural diagram of a tomographic image reconstruction device provided by an embodiment of the present invention, the device comprising:

[0057] An information acquisition module 210 is used to acquire distance information from an outer contour of a scanned object acquired by a distance detector, and to acquire a Lorentz force signal acquired by a Lorentz force imaging device;

[0058] An outer contour determining module 220, configured to determine an outer contour of the scanned object based on the distance information from the outer contour of the scanned object;

[0059] The data updating module 230 is used to create data to be reconstructed, wherein the data to be reconstructed includes undetermined parameters corresponding to the scanning space, and sets the undetermined parameters corresponding to the range outside the outer contour of the scanned object in the data to be reconstructed to preset parameter values, and retains the undetermined parameters in the range within the outer contour of the scanned object;

[0060] The image reconstruction module 240 is used to reconstruct the image based on the updated data to be reconstructed.

[0061] The tomographic image reconstruction device provided in the embodiment of the present invention can execute the tomographic image reconstruction method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of executing the tomographic image reconstruction method.

[0062] Figure 6A schematic structural diagram of a Lorentz force imaging device provided in an embodiment of the present invention, the Lorentz force imaging device comprising: a fixing device 110, an electrode 120, a magnet 130, a signal acquisition device 140, a transmission scanning device 150 and a distance detector 160, wherein the electrode 120 is a hollow structure, and the hollow space in the electrode 120 is used to accommodate a scanned object; the fixing device 110 is arranged at both ends of the electrode 120, and is used to fix the scanned object passing through the electrode 120; the transmission scanning device 150 is used to carry the magnet 130 and the signal acquisition device 140, the magnet 130 is used to form a magnetic field, and the scanned object forms a Lorentz force signal in the electric field formed by the magnetic field and the electrode 120; the distance detector 160 is used to collect distance information from the outer contour of the scanned object; the signal acquisition device 140 is used to collect a Lorentz force signal in the space where the scanned object is located, and the Lorentz force signal and the distance information are used to reconstruct a tomographic image of the scanned object.

[0063] Biological tissue has a special conductivity effect. When an external AC magnetic field is applied to the tissue medium carrying DC current, the tissue vibrates at the frequency of the magnetic field and generates sound waves. The sound wave conversion probe placed close to the tissue can detect the sound wave response related to the biological current.

[0064] In this embodiment, the magnet 130 is used to form a constant magnetic field, and the electrode 120 forms an electric field after being powered on. The magnet 130 is arranged outside the electrode 120, and the electric field and the magnetic field are simultaneously applied to the scanned object located in the hollow structure of the electrode 120, so that the biological tissue of the scanned object generates sound waves when vibrating.

[0065] The electrode 120 may be, but is not limited to, a hollow columnar structure or a cone structure, and is not limited thereto. The size of the electrode 120 may be determined based on the type of the scanned object. In some embodiments, the scanned object may be a small animal or a limb of a human body (e.g., an arm or a leg), and accordingly, the size of the electrode 120 in the Lorentz force imaging device is a first size; in some embodiments, the scanned object may be a large animal or a human body trunk, and accordingly, the size of the electrode 120 in the Lorentz force imaging device is a second size, wherein the first size is smaller than the second size.

[0066] The motor 120 is also connected to a power source, and when the power source is activated, the motor 120 is powered on and forms an electric field. Optionally, the power source may be connected to an operation button of the power source, and the operation button is a physical button, and when the operator presses it, the power source is activated. Optionally, the motor 120 is triggered by current excitation, such as direct current excitation.

[0067] The fixing device 110 is arranged at both ends of the electrode 120, and is used to fix the scanning object passing through the electrode 120. Exemplarily, the fixing device 110 can be arranged on a carrying device, and the carrying device can be arranged on the side of the electrode 120. The height of the carrying device is greater than the height of the electrode 120. The fixing devices 110 are respectively arranged at both ends of the carrying device. When the scanning object passes through the electrode 120, the scanning object can be fixed by the fixing devices 110 at both ends of the electrode 120, so as to avoid inaccurate signal acquisition caused by the movement of the scanning object in the process of obtaining the Lorentz force signal, and further cause quality problems such as overlap or artifacts in the reconstructed image.

[0068] The size of the fixing device 110 is adjustable to be suitable for scanning objects of different sizes. Optionally, at least one fixing device 110 corresponding to each port of the electrode 120 may be provided. For example, one or two fixing devices 110 corresponding to each port of the electrode 120 may be provided. When one fixing device 110 is provided for each port of the electrode 120, the fixing device 110 may be adapted to fix scanning objects such as human arms or legs. When two fixing devices 110 are provided for each port of the electrode 120, the fixing device 110 may be adapted to fix scanning objects such as mice. In this embodiment, the material of the fixing device 110 is not limited, and may be, for example, leather or metal.

[0069] Based on the above embodiment, the Lorentz force imaging device further includes a magnet 130 for forming a magnetic field. Specifically, the magnet includes a positive pole magnet and a negative pole magnet.

[0070] In some embodiments, the Lorentz force imaging device includes multiple groups of magnets, each group of magnets may include positive magnets and negative magnets, and the multiple groups of magnets are circumferentially arranged outside the electrode 120. Correspondingly, the signal acquisition device 140 includes multiple Lorentz force signal detectors, and the setting density of the Lorentz force signal detectors can be determined according to the unit acquisition angle of the Lorentz force signal. A Lorentz force signal detector is set corresponding to each unit acquisition angle. The multiple Lorentz force signal detectors in the signal acquisition device 140 synchronously collect the Lorentz force signal of the scanned object, which can realize the collection of the Lorentz force signal of the current layer. Optionally, the Lorentz force signal detector can be a pressure sensor. The above-mentioned multiple groups of magnets and the multiple Lorentz force signal detectors in the signal acquisition device 140 are all arranged on the transmission scanning device 150, and the transmission scanning device 150 may include an annular device and a vertical device, wherein the electrode 120 is arranged coaxially with the annular device, and the electrode 120 is arranged inside the annular device. The multiple groups of magnets and the multiple Lorentz force signal detectors in the signal acquisition device 140 are all arranged on the annular device of the transmission scanning device 150, and the annular device can move on the vertical device, and the vertical device can be arranged on the carrying device. Among them, the unit distance moved by the annular device on the vertical device can be the layer distance of the tomographic scanning. Specifically, the annular device can be moved on the vertical device in the direction from top to bottom or from bottom to top. At each scanning layer position, the multiple Lorentz force signal detectors on the annular device synchronously collect the Lorentz force signals of each scanning angle of the scanning layer, and after each Lorentz force signal detector completes scanning, the annular device moves to the next scanning layer until the Lorentz force signals of each scanning layer of the scanning object are obtained, thereby realizing the tomographic scanning of the scanning object.

[0071] In some embodiments, the Lorentz force imaging device also includes a controller (not shown in the figure), which can be electrically connected to the transmission scanning device 150 and the signal acquisition device 140, and is used to send up and down movement signals to the annular device in the transmission scanning device 150, and when the movement of the annular device is completed, send a signal acquisition trigger signal to each Lorentz force signal detector of the signal acquisition device 140, so as to enable the Lorentz force imaging device to automatically complete the tomographic scanning of the scanning object.

[0072] In some embodiments, the Lorentz force imaging device includes two magnets, namely a positive magnet and a negative magnet, which are arranged outside the electrode 120, for example, the distances between the two magnets and the central axis of the electrode 120 are the same, for example, the arrangement positions of the two magnets can be axisymmetrically arranged outside the electrode 120. The magnet 130, the signal acquisition device 140 and the distance detector 160 are arranged on the transmission scanning device 150, wherein the signal acquisition device 140 is used to collect the Lorentz force signal of the scanned object. The signal acquisition device 140 includes a Lorentz force signal detector, which is arranged on the mid-perpendicular line of the two magnets 130 to ensure the quality of the Lorentz force signal collected by the signal acquisition device 140. The distance detector 160 is used to collect the distance between the position corresponding to the signal acquisition device 140 and the outer contour of the scanned object. The signal acquisition device 140 and the distance detector 160 may be connected to the image reconstruction processing device respectively, for example, they may be connected by communication or electrical connection, and are used to transmit the collected Lorentz force signal and distance information to the image reconstruction processing device, so that the image reconstruction processing device performs image reconstruction, wherein the image reconstruction may be realized based on the tomographic image reconstruction method provided in any of the above embodiments to obtain a tomographic image of the scanned object. The Lorentz force imaging device may also include a communication module, the signal acquisition device 140 and the distance detector 160 are electrically connected to the communication module respectively, and the collected Lorentz force signal and distance information are transmitted to the communication module, and the communication module transmits the Lorentz force signal and distance information to the image reconstruction processing device. The Lorentz force imaging device may also include a storage module, the signal acquisition device 140 and the distance detector 160 are electrically connected to the storage module respectively, and the collected Lorentz force signal and distance information are transmitted to the storage module for storage, and after the scanning of the scanned object is completed, the collected Lorentz force signal and distance information are exported in the form of a file export.

[0073] The transmission scanning device 150 includes an annular device and a vertical device, wherein the annular device moves up and down on the vertical device. In some embodiments, the magnet 130 and the signal acquisition device 140 are fixedly arranged on the annular device. Accordingly, the annular device drives the signal acquisition device to perform circumferential motion, wherein the circumferential motion step length of the annular device is the circumferential acquisition step length of the signal acquisition device, and the signal acquisition device 140 can collect the Lorentz force signal corresponding to each circumferential acquisition step length. When the annular device completes one rotation, the signal acquisition device 140 can collect multiple Lorentz force signals corresponding to one rotation during the rotation of the annular device, that is, multiple Lorentz force signals of the scanning layer where the annular device is located. The circumferential acquisition step length of the annular device can be determined based on the unit scanning angle of the Lorentz force signal and the radius of the annular device. At the same time, the annular device can move up and down on the vertical device to realize the acquisition of scanning signals of different scanning layers.

[0074] Optionally, the controller may be electrically connected to the annular device and the signal acquisition device 140 in the transmission scanning device 150, respectively, and is used to send an up-and-down movement signal to the annular device in the transmission scanning device 150, and send a signal acquisition trigger signal to the signal acquisition device 140 when the annular device moves to any scanning layer, and send a rotation signal to the annular device when the signal acquisition trigger signal is completed, so as to control the annular device to move the circumferential acquisition step length along the rotation direction, and send the next signal acquisition trigger signal to the signal acquisition device 140 until the signal acquisition of the scanning layer is completed. When it is determined that the acquisition of each Lorentz force signal of the current scanning layer is completed, the controller sends an up-and-down movement signal to the annular device, so that the environmental device responds to the movement signal and moves to the next scanning layer until the tomographic scanning of the scanning object is completed.

[0075] In some embodiments, the magnet 130 and the signal acquisition device 140 are movably disposed on the annular device, and accordingly, the magnet 130 and the signal acquisition device 140 synchronously perform circumferential motion on the annular device to ensure the relative position relationship between the magnet 130 and the signal acquisition device 140, thereby ensuring the quality of the Lorentz force signal.

[0076] Optionally, the controller may be electrically connected to the annular device, the signal acquisition device 140 and the magnet 130 in the transmission scanning device 150, respectively, and is used to send an up-and-down movement signal to the annular device in the transmission scanning device 150, and send a signal acquisition trigger signal to the signal acquisition device 140 when the annular device moves to any scanning layer, and send a rotation signal to the signal acquisition device 140 and the magnet 130 when the signal acquisition trigger signal is acquired, so as to control the signal acquisition device 140 and the magnet 130 to move the circumferential acquisition step length in the rotation direction, and send the next signal acquisition trigger signal to the signal acquisition device 140 until the signal acquisition of the scanning layer is completed. When it is determined that the acquisition of each Lorentz force signal of the current scanning layer is completed, the controller sends an up-and-down movement signal to the annular device, so that the environmental device responds to the movement signal and moves to the next scanning layer until the tomographic scanning of the scanning object is completed.

[0077] In the above embodiment, the signal acquisition device 140 sends the collected Lorentz force signal to the controller, and the controller sets an identifier for the received Lorentz force signal according to the scanning angle and scanning layer of the signal acquisition device 140. The identifier can be a layer-angle label or a serial number identifier, so as to facilitate the storage and management of the received Lorentz force signal. For example, the identifier of the Lorentz force signal can be 1-30°, indicating that the Lorentz force signal can correspond to the first scanning layer and the scanning angle is 30°. The controller can count whether the signal acquisition of the current scanning layer is completed according to the identifier of the received Lorentz force signal.

[0078] On the basis of the above embodiment, the signal acquisition device 140 is a retractable device, which may include a Lorentz force signal detector and a retractable component. The Lorentz force signal detector is arranged on the retractable component, and the retractable component is arranged on the annular device. The retractable direction of the retractable component is perpendicular to the normal of the annular device, and is used to drive the Lorentz force signal detector away from the scanning object or approach the scanning object.

[0079] The Lorentz force signal has losses in the air. In order to avoid the inaccurate Lorentz force signal caused by the different losses of the Lorentz force signals at different positions, in this embodiment, by setting the signal acquisition device 140 of the retractable device, the distance of the signal acquisition device 140 relative to the scanning object can be adjusted during the collection of the Lorentz force signal to ensure that the distance of the signal acquisition device 140 relative to the scanning object is the same when each Lorentz force signal is collected, thereby ensuring that the collected Lorentz force signals have the same losses in the air, and further ensuring the relative stability between the Lorentz force signals.

[0080] The signal acquisition device 140 is electrically connected to the controller, and the controller is used to send a telescopic control signal to the signal acquisition device 140; the signal acquisition device 140 is used to adjust the telescopic size according to the telescopic control signal sent by the controller, and collect the Lorentz force signal in the space where the scanning object is located. Specifically, the controller is electrically connected to the telescopic component in the signal acquisition device 140, and the telescopic component drives the Lorentz force signal detector to telescope in response to the telescopic control instruction after receiving the telescopic control instruction. The telescopic control instruction includes a telescopic direction and a telescopic distance, wherein the telescopic direction may include inward and outward, for example, it may be distinguished by 1 and 0. For example, the telescopic control instruction includes 1, which indicates that the Lorentz force signal detector is driven to move inward, and the telescopic control instruction includes 0, which indicates that the Lorentz force signal detector is driven to move outward.

[0081] In some embodiments, the outer contour of the scanned object is predetermined, and the controller determines the telescopic information processed at each scanning position in each scanning layer based on the fixed position and the outer contour of the scanned object, and forms a telescopic control instruction based on the telescopic information.

[0082] Specifically, it is arranged on the annular device of the transmission scanning device 150 to detect the distance between the scanning object and the scanning object during the process of collecting the Lorentz force signal. In this embodiment, the distance detector 160 may include but is not limited to an ultrasonic rangefinder, a laser rangefinder, etc., which is not limited to this.

[0083] Optionally, the distance detector 160 and the signal acquisition device 140 may be arranged up and down, and the distance between the distance detector 160 and the signal acquisition device 140 may be zero. The distance detector 160 is used to collect the distance between the position corresponding to the signal acquisition device 140 and the outer contour of the scanned object. The distance detector 160 is fixedly arranged in the annular device, and during the signal acquisition process, the relative position with the annular device remains unchanged to ensure the accuracy of the detected distance. In the case where the signal acquisition device 140 includes multiple Lorentz force signal detectors, each Lorentz force signal detector corresponds to a distance detector 160, and the distance detected by each distance detector 160 from the outer contour of the scanned object is sent to the controller. The controller generates a telescopic control signal of the Lorentz force signal detector corresponding to the distance detector 160 based on the received distance and the identifier of the distance detector 160. In the case where the signal acquisition device 140 includes one Lorentz force signal detector, the number of the distance detector 160 is one, and accordingly, after receiving the distance sent by the distance detector 160, the controller generates a telescopic control signal and sends the telescopic control signal to the signal acquisition device 140.

[0084] Optionally, the distance detector 160 and the signal acquisition device 140 can be horizontally arranged on the annular device, and the setting spacing between the distance detector 160 and the signal acquisition device 140 is determined according to the acquisition step length of the signal acquisition device, and the distance detector 160 is used to collect the distance between the next step and the surface of the scanned object. Among them, the distance detector 160 can be moved on the annular device, and after determining the setting spacing with the signal acquisition device 140, it can be fixedly arranged on the annular device. Specifically, the distance detector 160 can be arranged on the annular device through a fastening component. When the fastening component is in a relaxed state, the distance detector 160 can be moved on the annular device. When the fastening component is in a clamped state, the distance detector 160 is fixedly arranged on the annular device. By adjusting the setting spacing between the distance detector 160 and the signal acquisition device 140, different scanning requirements can be met.

[0085] The distance detector 160 is arranged at the next acquisition step in the scanning direction of the signal acquisition device 140, and is used to collect the distance between the next step length and the surface of the scanned object. The signal acquisition device 140 collects the Lorentz force signal at the current position, and at the same time, the distance detector 160 collects the distance between the next step length and the surface of the scanned object. The two are executed synchronously, which improves the signal acquisition efficiency.

[0086] The controller can simultaneously send a trigger signal to the distance detector 160 and the signal acquisition device 140 to control the signal acquisition device 140 to collect the Lorentz force signal at the current position and the distance detector 160 to collect the distance between the next step length and the surface of the scanned object. The controller obtains the distance information between the distance detector and the scanned object, generates a telescopic control signal for the next step length, controls the signal acquisition device 140 to move to the next step length position (for example, by controlling the annular device to rotate, or by controlling the signal acquisition device 140 and the magnet 130 to rotate synchronously), and sends the telescopic control signal for the next step length to the signal acquisition device 140, so that the signal acquisition device executes the telescopic control signal and collects the Lorentz force signal corresponding to the next step length.

[0087] On the basis of the above embodiment, the Lorentz force imaging device also includes a shielding device, which is arranged on the periphery of the fixing device and is used to shield the Lorentz force signal radiating to the outside. The shielding device may include a cutoff electromagnetic waveguide array and an attractive sponge layer, which are used to shield the Lorentz force signal and the acoustic signal respectively. The cutoff electromagnetic waveguide array and the cutoff acoustic waveguide array may be honeycomb structures respectively. The use of the electromagnetic waveguide array is mainly for the heat dissipation of the device and the frequency domain Lorentz force imaging signal is generally concentrated at a certain frequency. The waveguide array can have a good shielding effect on the noise in the cutoff frequency. For example, see Figure 7 , Figure 7 is a schematic diagram of a shielding device provided by an embodiment of the present invention, Figure 2 It is only a partial schematic diagram.

[0088] Optionally, the cutoff electromagnetic waveguide array of the honeycomb structure and the attraction sponge layer can form a double shielding device, and the Lorentz force prevents the Lorentz force signal and the acoustic signal outside the scanning space from diffusing into the Lorentz force imaging device and interfering with the Lorentz force signal.

[0089] The technical solution of this embodiment is to form a Lorentz force signal in the scanning space through magnets and electrodes. The Lorentz force signal passes through the scanning object in the scanning space. The Lorentz force signal passing through the scanning object is received by a signal acquisition device arranged on a transmission scanning device. The transmission scanning device drives the signal acquisition device to move to acquire Lorentz force signals at different angles of different scanning layers, thereby realizing tomographic scanning of the scanning object.

[0090] Reference below Figure 8 , which shows an electronic device (eg, Figure 8The terminal device in the embodiment of the present disclosure may include but is not limited to mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 8 The electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present disclosure.

[0091] like Figure 8 As shown, the electronic device 400 may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 401, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 402 or a program loaded from a storage device 408 into a random access memory (RAM) 403. In the RAM 403, various programs and data required for the operation of the electronic device 400 are also stored. The processing device 401, the ROM 402, and the RAM 403 are connected to each other via a bus 404. An input / output (I / O) interface 405 is also connected to the bus 404.

[0092] Typically, the following devices may be connected to the I / O interface 405: an input device 406 including, for example, a touch screen, a touch pad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; an output device 407 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 408 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 409. The communication device 409 may allow the electronic device 400 to communicate with other devices wirelessly or by wire to exchange data. Although Figure 8 The electronic device 400 is shown with various devices, but it should be understood that it is not required to implement or possess all the devices shown. More or fewer devices may be implemented or possessed instead.

[0093] In particular, according to an embodiment of the present disclosure, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present disclosure includes a computer program product, which includes a computer program carried on a non-transitory computer-readable medium, and the computer program contains program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication device 409, or installed from the storage device 408, or installed from the ROM402. When the computer program is executed by the processing device 401, the above-mentioned functions defined in the method of the embodiment of the present disclosure are executed.

[0094] The electronic device provided in the embodiment of the present disclosure and the tomographic image reconstruction method provided in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0095] The embodiment of the present disclosure provides a computer storage medium on which a computer program is stored. When the program is executed by a processor, the tomographic image reconstruction method provided by the above embodiment is implemented.

[0096] It should be noted that the computer-readable medium disclosed above may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, device or device. In the present disclosure, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which a computer-readable program code is carried. This propagated data signal may take a variety of forms, including but not limited to a Lorentz force signal, an optical signal, or any suitable combination of the above. The computer readable signal medium may also be any computer readable medium other than a computer readable storage medium, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer readable medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0097] In some embodiments, the client and the server may communicate using any currently known or future developed network protocol such as HTTP (HyperText Transfer Protocol), and may be interconnected with any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network ("LAN"), a wide area network ("WAN"), an internet (e.g., the Internet), and a peer-to-peer network (e.g., an ad hoc peer-to-peer network), as well as any currently known or future developed network.

[0098] The computer-readable medium may be included in the electronic device, or may exist independently without being incorporated into the electronic device.

[0099] The computer-readable medium carries one or more programs. When the one or more programs are executed by the electronic device, the electronic device:

[0100] Acquire the distance information from the outer contour of the scanned object collected by the distance detector, and acquire the Lorentz force signal collected by the Lorentz force imaging device;

[0101] Determining the outer contour of the scanned object based on the distance information to the outer contour of the scanned object;

[0102] Creating data to be reconstructed, wherein the data to be reconstructed includes undetermined parameters corresponding to the scanning space;

[0103] In the data to be reconstructed, the undetermined parameters corresponding to the range outside the outer contour of the scanned object are set as preset parameter values, and the undetermined parameters in the range within the outer contour of the scanned object are retained;

[0104] The image is reconstructed based on the updated data to be reconstructed.

[0105] Computer program code for performing the operations of the present disclosure may be written in one or more programming languages ​​or a combination thereof, including, but not limited to, object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0106] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some implementations as replacements, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0107] The units involved in the embodiments described in the present disclosure may be implemented by software or hardware, wherein the name of a unit / module does not, in some cases, constitute a limitation on the unit itself.

[0108] The functions described above herein may be performed at least in part by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chip (SOCs), complex programmable logic devices (CPLDs), and the like.

[0109] In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0110] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A tomographic image reconstruction method, characterized in that: The method is performed based on the Lorentz force signal and distance information acquired by the Lorentz force imaging device, the Lorentz force imaging device comprises a signal acquisition device, a distance detector and a transmission scanning device, the transmission scanning device is used to carry the signal acquisition device and the distance detector, the signal acquisition device is used to acquire the Lorentz force signal of the scanned object, the distance detector is used to acquire the distance information between the position corresponding to the signal acquisition device and the outer contour of the scanned object, the method comprises: Acquire the distance information from the outer contour of the scanned object collected by the distance detector, and acquire the Lorentz force signal collected by the signal acquisition device, wherein the distance information is provided with a position tag, and the position tag includes scanning layer information and scanning angle information; Based on the distance information from the outer contour of the scanned object, and the scanning layer information and the scanning angle information in the position tag of the distance information, the edge point corresponding to the position tag is determined, and the adjacent edge points corresponding to each position tag are connected to obtain the outer contour of the scanned object; Creating data to be reconstructed, wherein the data to be reconstructed includes undetermined parameters corresponding to the scanning space; In the data to be reconstructed, the undetermined parameters corresponding to the range outside the outer contour of the scanned object are set as preset parameter values, and the undetermined parameters in the range within the outer contour of the scanned object are retained; The image is reconstructed based on the updated data to be reconstructed.

2. A tomographic image reconstruction device, characterized in that: The device processes the Lorentz force signal and distance information acquired by the Lorentz force imaging device. The Lorentz force imaging device includes a signal acquisition device, a distance detector and a transmission scanning device. The transmission scanning device is used to carry the signal acquisition device and the distance detector. The signal acquisition device is used to acquire the Lorentz force signal of the scanned object. The distance detector is used to acquire the distance information between the position corresponding to the signal acquisition device and the outer contour of the scanned object. The device includes: An information acquisition module, used to acquire distance information from an outer contour of a scanned object acquired by a distance detector, and to acquire a Lorentz force signal acquired by the signal acquisition device, wherein the distance information is provided with a position tag, and the position tag includes scanning layer information and scanning angle information; An outer contour determination module, used to determine the edge points corresponding to the position tags based on the distance information from the outer contour of the scanned object, and the scanning layer information and scanning angle information in the position tags of the distance information, and connect the adjacent edge points corresponding to the position tags to obtain the outer contour of the scanned object; A data updating module, used for creating data to be reconstructed, wherein the data to be reconstructed includes pending parameters corresponding to the scanning space, setting the pending parameters corresponding to the range outside the outer contour of the scanned object in the data to be reconstructed to preset parameter values, and retaining the pending parameters within the range within the outer contour of the scanned object; The image reconstruction module is used to reconstruct the image based on the updated data to be reconstructed.

3. A Lorentz force imaging device, characterized in that: include: Fixing device, electrode, magnet, signal acquisition device, distance detector and transmission scanning device; wherein, The electrode is a hollow structure, the hollow space in the electrode is used to accommodate the scanned object, and the electrode is used to form an electric field after being powered on; The fixing device is arranged at both ends of the electrode, and is used to fix the scanning object passing through the electrode; The transmission scanning device is used to carry the magnet, the signal acquisition device and the distance detector, the magnet is used to form a constant magnetic field, and the scanning object forms a Lorentz force signal in the electric field formed by the magnetic field and the electrode; The distance detector is used to collect distance information from the outer contour of the scanned object; The signal acquisition device is used to acquire the Lorentz force signal in the space where the scanned object is located, and the Lorentz force signal and the distance information are used to reconstruct a tomographic image of the scanned object.

4. The Lorentz force imaging device according to claim 3, characterized in that: The transmission scanning device comprises an annular device and a vertical device, wherein the annular device moves up and down on the vertical device, and the magnet and the signal acquisition device are arranged on the annular device.

5. The Lorentz force imaging device according to claim 4, characterized in that: There are two magnets, and the signal acquisition device is arranged on the mid-perpendicular line of the two magnets; The annular device drives the signal acquisition device to perform circumferential motion, wherein the circumferential motion step length of the annular device is the circumferential acquisition step length of the signal acquisition device.

6. The Lorentz force imaging device according to claim 4, characterized in that: There are two magnets, and the signal acquisition device is arranged on the mid-perpendicular line of the two magnets; The magnet and the signal acquisition device move synchronously on the signal acquisition device, and the movement step length of the magnet and the signal acquisition device is the circumferential acquisition step length of the signal acquisition device.

7. The Lorentz force imaging device according to any one of claims 3 to 6, characterized in that: The signal acquisition device is a retractable device; The Lorentz force imaging device further includes a controller, and the controller is further used to send a telescopic control signal to the signal acquisition device; The signal acquisition device is used to adjust the telescopic size according to the telescopic control signal sent by the controller, and to acquire the Lorentz force signal in the space where the scanning object is located.

8. The Lorentz force imaging device according to claim 7, characterized in that: The distance detector is electrically connected to the controller and is used to send the collected distance information to the controller; The controller is further configured to generate a telescopic control signal according to the distance sent by the distance detector.

9. An electronic device, characterized in that: The electronic device comprises: one or more processors; a storage device for storing one or more programs, When the one or more programs are executed by the one or more processors, the one or more processors implement the tomographic image reconstruction method according to claim 1. 10 . A storage medium comprising computer executable instructions, wherein the computer executable instructions are used to perform the tomographic image reconstruction method according to claim 1 when executed by a computer processor.

Images