A radiographic image control method based on image analysis

Abstract

The present invention relates to the field of medical X-ray control technology, and in particular to a radiographic image control method based on image analysis, comprising: step S1, collecting target part images of a target object based on a number of time points; step S2, determining the damage center and damage radius of the image based on a single target part image, and determining the damage area of ​​the target object according to the damage center and damage radius; step S3, determining the moving parameter of the damage center based on the position change of the damage center of a number of target part images taken in time sequence; step S4, determining the moving radius of the patient's damage area according to the moving parameter of the damage center and the damage area; step S5, determining the irradiation range of X-rays according to the moving parameter and moving radius of the damage center. The present invention can focus X-rays on the target area more quickly and reduce the radiation damage of X-rays to patients by accurately controlling the irradiation range of X-rays.

Description

Technical Field

[0001] The present invention relates to the technical field of medical X-ray control, and in particular to a radiographic image control method based on image analysis. Background Art

[0002] X-rays are high-energy electromagnetic waves with strong penetrability, capable of penetrating many substances, including human tissue. Therefore, X-rays are widely used in the fields of medical treatment, security inspection, and industrial inspection. In medical examinations, determining the X-ray irradiation range can ensure that only necessary parts of the body receive radiation, reduce unnecessary radiation exposure, and thus protect the patient's health. In security inspections and industrial inspections, clarifying the irradiation range can avoid unnecessary radiation to the surrounding environment and objects.

[0003] Chinese patent publication number: CN108078578B, discloses an X-ray machine intelligent camera recognition system based on area recognition analysis: the controller in the X-ray inspection equipment is connected to the irradiation lamp driver in the beam spotter device through an electrical / signal control circuit; the camera in the beam spotter device is connected to the controller in the X-ray inspection equipment through a data information transmission circuit; the controller in the X-ray inspection equipment is connected to the X-ray machine driver through a signal transmission and control module; including an X-ray machine system for driving the X-ray machine to perform corresponding actions; including an image acquisition unit for light information acquisition; including an image analysis unit for light information analysis; including a data analysis control unit for exposure dose analysis control.

[0004] It can be seen that the above technical solution mainly collects the patient's irradiation part through the camera at the beam beam end, and intelligently selects the irradiation light field to reduce the X-ray irradiation range, thereby reducing the X-ray irradiation dose and effectively protecting the patient's health. However, there are still the following problems: the patient's own movement factor is not considered, and the patient's own movement will also cause the X-ray irradiation range to be inaccurate, resulting in an excessively large X-ray irradiation range. Summary of the invention

[0005] To this end, the present invention provides a radiographic image control method based on image analysis to overcome the problem in the prior art that when a patient undergoes an X-ray examination, the position of the patient being examined moves due to interference from the patient himself or the environment, resulting in an excessively large X-ray irradiation range.

[0006] To achieve the above object, the present invention provides a radiographic image control method based on image analysis, comprising:

[0007] Step S1, collecting images of a target part of a target object based on a number of time points, including an apparent image and an infrared image;

[0008] Step S2, determining the damage center and damage radius of the image based on the single target part image, and determining the damage area of ​​the target object according to the damage center and the damage radius;

[0009] Step S3, determining the movement parameter of the injury center based on the position change of the injury center of the plurality of target part images taken in time sequence, wherein the movement parameter includes a movement speed and a movement direction;

[0010] Step S4, determining the moving radius of the damage area of ​​the target object according to the moving parameter of the damage center and the damage area;

[0011] Step S5, determining the X-ray irradiation range according to the movement parameter and movement radius of the damage center, wherein the irradiation range includes the irradiation center and the irradiation radius.

[0012] Furthermore, in step S2, it includes:

[0013] Step S21, dividing the target part image into different hierarchical regions based on corresponding distinguishing features;

[0014] Step S22, determining the damage boundary and the damage center according to the characteristic change trend of the hierarchical area;

[0015] Step S23, determining the damage radius according to the damage boundary and the damage center;

[0016] Step S24, determining the damage area according to the damage center and the damage radius.

[0017] Furthermore, in step S22, determining the damage center includes: respectively identifying the convergence center of the hierarchical area of ​​the infrared image and / or the concentration center of several convergence centers, and determining the convergence center and / or the concentration center of several convergence centers as the damage center.

[0018] Furthermore, in step S22, the damage center is corrected, wherein:

[0019] Extracting damage features from individual appearance images respectively, and determining significant areas of the damage features;

[0020] Based on the comparison between the positions of the significant area and the lesion center, the lesion center is corrected according to the comparison result.

[0021] Furthermore, the damage center is corrected, including: determining a significant center of the significant area, and re-determining the damage center position based on the significant center position and the damage center position.

[0022] Further, in step S23, determining the damage radius includes:

[0023] determining the distance between the injury center and the injury boundary in several directions;

[0024] An average distance or a maximum distance is calculated based on the distances in the plurality of directions, and the average distance or the maximum distance is set as the damage radius.

[0025] Furthermore, in step S3, the movement parameter of the damage center is determined, including:

[0026] respectively determining the injury center positions of the plurality of target part images acquired at a plurality of time points;

[0027] Calculate the position difference of the injury center at adjacent time points respectively;

[0028] The moving speed and moving direction of the damage center are determined according to the position difference.

[0029] Furthermore, in step S4, it includes:

[0030] According to the movement parameters of the damage center and the damage radius, the location of the damage area at each time point is determined;

[0031] The positions of the damaged area at several time points are superimposed to obtain the moving radius of the damaged area.

[0032] Further, in step S5, the shape of the X-ray irradiation range is determined according to the movement parameter of the damage center, including:

[0033] If the movement parameter of the damage center is linear movement, the shape of the X-ray irradiation range is rectangular;

[0034] If the movement parameter of the damage center is nonlinear movement, the shape of the X-ray irradiation range is circular or elliptical.

[0035] Furthermore, in step S5, determining the irradiation radius of the X-ray includes: determining the irradiation radius according to the moving radius and the damage radius.

[0036] Compared with the prior art, the beneficial effect of the present invention lies in determining the damage center and damage radius of the image based on the target part image of the target object collected at several time points, determining the damage area of ​​the target object based on the damage center and the damage radius, further determining the moving trajectory of the damage center based on the temporal change of the damage center, and determining the moving radius of the damage area of ​​the target object based on the moving trajectory of the damage center and the range of the damage area, thereby further determining the irradiation range of the X-ray, focusing the X-ray to the target area more quickly, achieving precise control of the X-ray irradiation, and reducing the radiation damage of the X-ray to the patient.

[0037] Furthermore, the present invention divides the target part image into different hierarchical regions through image processing technology, and then determines the damage boundary and damage center according to the characteristic change trend of the hierarchical region. Subsequently, the damage radius is determined by measuring the distance between the damage center and the damage boundary, and finally the damage area is determined, thereby further determining the irradiation range of the X-ray, focusing the X-ray on the target area more quickly, achieving precise control of the X-ray irradiation, and reducing the radiation damage of the X-ray to the patient.

[0038] Furthermore, the present invention obtains the center of the most seriously injured area of ​​the target object by identifying the convergence center of the hierarchical area of ​​the infrared image / or the concentration center of several convergence centers, and at the same time corrects the position of the damage center according to the damage characteristics in the apparent image, thereby further determining the irradiation range of the X-ray, focusing the X-ray to the target area more quickly, achieving precise control of the X-ray irradiation, and reducing the radiation damage of the X-ray to the patient.

[0039] Furthermore, the present invention determines the distance between the injury center and the injury boundary in several directions, calculates the average distance or the maximum distance based on the distances in the several directions, and takes the average distance or the maximum distance as the injury radius. The injury range can be determined based on the calculated injury radius, thereby further determining the irradiation range of the X-ray, focusing the X-ray on the target area more quickly, achieving precise control of the X-ray irradiation, and reducing the radiation damage of the X-ray to the patient.

[0040] Furthermore, the present invention calculates the position difference of the damage center at adjacent time points by determining the damage center position of the plurality of target part images collected at a plurality of time points, determines the moving speed and moving direction of the damage center according to the position difference, and obtains the moving trajectory of the damage center, thereby further determining the irradiation range of the X-ray, focusing the X-ray to the target area more quickly, achieving precise control of the X-ray irradiation, and reducing the radiation damage of the X-ray to the patient.

[0041] Furthermore, the present invention determines the position of the damaged area at each time point, and superimposes the position of the damaged area at each time point to obtain the moving radius of the damaged area, thereby further determining the irradiation range of the X-ray, focusing the X-ray to the target area more quickly, achieving precise control of the X-ray irradiation, and reducing the radiation damage of the X-ray to the patient.

[0042] Furthermore, the present invention determines the shape of the X-ray irradiation range according to the movement parameters of the damage center, thereby further determining the X-ray irradiation range, focusing the X-ray to the target area more quickly, achieving precise control of the X-ray irradiation, and reducing X-ray radiation damage to the patient.

[0043] Furthermore, the present invention determines the irradiation radius according to the moving radius and the damage radius, thereby further determining the irradiation range of the X-ray, focusing the X-ray to the target area more quickly, achieving precise control of the X-ray irradiation, and reducing the radiation damage of the X-ray to the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a flow chart of the radiographic image control method based on image analysis of the present invention;

[0045] Figure 2 is a schematic diagram of a radiographic image control method based on image analysis according to the present invention;

[0046] Figure 3 A flow chart for determining the damaged area for the present invention;

[0047] Figure 4 Flow chart for determining movement parameters of the lesion center for the present invention. DETAILED DESCRIPTION

[0048] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0049] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0050] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0051] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] See also Figure 1 , Figure 2 As shown, Figure 1is a flow chart of the radiographic image control method based on image analysis of the present invention, Figure 2 Schematic diagram of a radiographic image control method based on image analysis of the present invention. Specifically, the present invention provides a radiographic image control method based on image analysis, comprising:

[0053] Step S1, collecting images of a target part of a target object based on a number of time points, including an apparent image and an infrared image;

[0054] Step S2, determining the damage center and damage radius of the image based on the single target part image, and determining the damage area of ​​the target object according to the damage center and the damage radius;

[0055] Step S3, determining the movement parameter of the injury center based on the position change of the injury center of the plurality of target part images taken in time sequence, wherein the movement parameter includes a movement speed and a movement direction;

[0056] Step S4, determining the moving radius of the damage area of ​​the target object according to the moving parameter of the damage center and the damage area;

[0057] Step S5, determining the X-ray irradiation range according to the movement parameter and movement radius of the damage center, wherein the irradiation range includes the irradiation center and the irradiation radius.

[0058] It can be understood that the target part image is an image of the injured part of the target object (patient). By determining the injury center (the most serious point of the injured part) and the injury radius of the target part image, the injured area (overall injury outline) of the patient's injured part can be determined. The patient will move around before X-ray irradiation. The movement parameters (moving speed and moving direction) of the patient's injured part are determined according to the position change of the patient's injury center, thereby determining the approximate movement range of the patient's injured part. The X-ray irradiation range can be determined based on the movement range, so as to perform accurate X-ray irradiation on the patient's injured part.

[0059] In implementation, the value range of the several time points is 15s to 30s. Preferably, the value of the several time points is 20s. The value range and preferred value of the several time points can be adjusted according to actual conditions, which will not be repeated here.

[0060] The present invention determines the damage center and damage radius of the image based on the target part image of the target object collected at several time points, determines the damage area of ​​the target object based on the damage center and the damage radius, further determines the moving trajectory of the damage center based on the time series change of the damage center, and determines the moving radius of the damage area of ​​the target object in combination with the moving trajectory of the damage center and the range of the damage area, thereby further determining the irradiation range of the X-ray, focusing the X-ray to the target area more quickly, realizing precise control of the X-ray irradiation, and reducing the radiation damage of the X-ray to the patient.

[0061] See also Figure 3 As shown, Figure 3 The flowchart of determining the damaged area of ​​the present invention, specifically, in step S2, includes:

[0062] Step S21, dividing the target part image into different hierarchical regions based on corresponding distinguishing features;

[0063] Step S22, determining the damage boundary and the damage center according to the characteristic change trend of the hierarchical area;

[0064] Step S23, determining the damage radius according to the damage boundary and the damage center;

[0065] Step S24, determining the damage area according to the damage center and the damage radius.

[0066] It is understandable that the target part image is an apparent image and an infrared image. After a human body is obviously injured, the wound will self-repair, and a large number of cells in the wound will generate heat, so the temperature of the wound and its surroundings will become higher. Therefore, after collecting the infrared image, the infrared image is divided into different hierarchical areas (temperature levels) by isotherms, and the damage boundary is determined according to the temperature change trend of the hierarchical area. The damage boundary may be the area where the isotherm temperature change is most obvious, and then the damage radius and damage area are determined by the damage boundary and the damage center.

[0067] In a specific embodiment, the infrared image is subjected to denoising and image enhancement processing, and the image enhancement may be contrast enhancement, edge sharpening, etc., and the visibility of temperature differences in the infrared image is improved by image enhancement. Further, isotherms are determined by edge detection or threshold segmentation technology, and the isotherms connect pixels with the same or similar temperatures, and the infrared image is divided into different hierarchical areas according to different temperature values.

[0068] The present invention divides the target part image into different hierarchical areas through image processing technology, and then determines the damage boundary and damage center according to the characteristic change trend of the hierarchical area. Subsequently, the damage radius is determined by measuring the distance between the damage center and the damage boundary, and finally the damage area is determined, so as to further determine the irradiation range of X-rays, focus the X-rays on the target area more quickly, realize accurate control of X-ray irradiation, and reduce the radiation damage of X-rays to patients.

[0069] Specifically, in step S22, determining the damage center includes: respectively identifying the convergence center of the hierarchical area of ​​the infrared image and / or the concentration center of several convergence centers, and determining the convergence center and / or the concentration center of several convergence centers as the damage center.

[0070] In a specific embodiment, if the temperature variation of the hierarchical region in the infrared image is approximate, the geometric center of the temperature distribution in the hierarchical region is taken as the convergence center. If the hierarchical region has a regular shape (such as a circle or an ellipse), its geometric center is directly calculated as the convergence center. If the hierarchical region has an irregular shape, the convergence center is estimated by fitting the curve or surface using the least squares method.

[0071] It is understandable that if the infrared image is divided into multiple hierarchical regions, and each hierarchical region has its own convergence center, it is necessary to further determine the concentration centers of these convergence centers.

[0072] In a specific embodiment, a weighted average method can be used to calculate the concentration center, where the weight can be determined based on the area of ​​the hierarchical region, the degree of temperature anomaly or other relevant factors, or a clustering algorithm (such as hierarchical clustering) can be used to aggregate multiple convergence centers into one or a few center points, and then the most representative point is selected as the concentration center.

[0073] Assume that there are m convergence centers, each of which is (x k ,y k ), the weight of each convergence center is w k , k = 1, 2, ..., m, weight w k The formula is as follows:

[0074] w k =f(A k , T k , C k ) (1)

[0075] Among them, A k is the area of ​​the kth level region, T k is the temperature anomaly degree of the kth level area, C k is the shape complexity of the k-th level domain.

[0076] The calculation formula for the temperature anomaly degree of the k-th level area is as follows:

[0077]

[0078] Among them, T k is the temperature of the k-th hierarchical area, and T0 is the actual standard temperature of the corresponding part of the target object corresponding to the k-th hierarchical area.

[0079] The calculation formula for the temperature anomaly degree of the k-th level area is as follows:

[0080]

[0081] Among them, A k is the area of ​​the kth level region, P k is the perimeter of the k-th level region.

[0082] Then the concentration center (x c ,y c ) is determined by the following formula:

[0083]

[0084] Specifically, in step S22, the damage center is also corrected, wherein:

[0085] Comparing the damage feature in the apparent image with the position of the damage center, and correcting the damage center according to the comparison result, including:

[0086] Extracting damage features from individual appearance images respectively, and determining significant areas of the damage features;

[0087] Based on the comparison between the positions of the significant area and the lesion center, the lesion center is corrected according to the comparison result.

[0088] Specifically, the correction of the damage center includes: determining the significant center of the significant area, and re-determining the damage center position based on the significant center position and the damage center position.

[0089] It can be understood that damage features can be directly extracted from the apparent image. The damage features can be wound cracks, wound deformations, and wound color change features. Image processing technology (such as edge detection, threshold segmentation, morphological recognition, etc.) is used to extract the damage features, and then the damage features in a single apparent image and the damage center position of the infrared image are compared respectively to check whether the damage center is located in the significant area of ​​the damage features in the apparent image. If the damage center is in the significant area, it proves that the damage center position is correctly determined. If the damage center is no longer in the significant area, the damage center is corrected.

[0090] In a specific embodiment, assuming that the damage center of a certain infrared image is the concentration center (x c ,y c ), the salient center of the salient region is (x r ,y r ), the position offset of the damage center relative to the significant center is (Δx, Δy), then the re-determined damage center position is:

[0091] x' c =x c +0.5×Δx (6)

[0092] y' c =y c +0.5×Δy (7)

[0093] The present invention obtains the center of the most seriously injured area of ​​the target object by identifying the convergence center of the hierarchical area of ​​the infrared image / or the concentration center of several convergence centers, and at the same time corrects the position of the injury center according to the injury characteristics in the apparent image, thereby further determining the irradiation range of the X-ray, focusing the X-ray to the target area more quickly, achieving precise control of the X-ray irradiation, and reducing the radiation damage of the X-ray to the patient.

[0094] Specifically, in step S23, determining the damage radius includes:

[0095] determining the distance between the injury center and the injury boundary in several directions;

[0096] An average distance or a maximum distance is calculated based on the distances in the plurality of directions, and the average distance or the maximum distance is set as the damage radius.

[0097] It is understandable that the damage boundary may be irregular, so the distance between the damage center and the damage boundary in each direction is first determined, and the average distance or maximum distance is calculated based on the distances in several directions as the damage radius, which facilitates the subsequent determination of the damage area.

[0098] In implementation, several directions can be centered on the damage center, and directions can be selected every 15° to 30° to determine the distance between the damage center and the damage boundary. Preferably, several directions can be centered on the damage center, and directions can be selected every 20° to determine the distance between the damage center and the damage boundary. The selection range and preferred range of the several directions can be adjusted according to actual conditions, which will not be repeated here.

[0099] In a specific embodiment, the lesion center position in a single target part image is (x0, y0), where the intersection of the i-th direction and the lesion boundary is (x i ,yi ), so the distance d from the damage center to the damage boundary (in the i-th direction) i The calculation formula is as follows:

[0100]

[0101] Assume that the intersection points of several directions with the damage boundary are {(x1, y1), ..(x i ,y i ), .., (x n ,y n )}, then the average distance The calculation formula is as follows:

[0102]

[0103] Subsequently, the damage range can be determined based on the calculated damage radius.

[0104] The present invention determines the distances between the injury center and the injury boundary in several directions, calculates the average distance or the maximum distance based on the distances in the several directions, and uses the average distance or the maximum distance as the injury radius. The injury range can be determined based on the calculated injury radius, thereby further determining the irradiation range of the X-ray, focusing the X-ray on the target area more quickly, achieving precise control of the X-ray irradiation, and reducing the radiation damage of the X-ray to the patient.

[0105] See also Figure 4 FIG. 4 is a flow chart of determining the movement parameters of the damage center according to the present invention. Specifically, in step S3, determining the movement parameters of the damage center includes:

[0106] Step S31, respectively determining the injury center positions of the plurality of target part images acquired at a plurality of time points;

[0107] Step S32, respectively calculating the position difference of the injury center position at adjacent time points;

[0108] Step S33, determining the moving speed and moving direction of the damage center according to the position difference.

[0109] It can be understood that the movement parameter is the movement trajectory of the injury center at several time points, and the movement speed and movement direction of the injury part can be determined based on the movement changes of the injury center position at several time points.

[0110] The position difference between the damage center at the j+1th time point and the jth time point is as follows:

[0111] Δdx j =x j+1 -x j (10)

[0112] Δdy j =y j+1 -y j (11)

[0113] Among them, (x j+1 ,y j+1 ) is the damage center position at the j+1th time point, (x j ,y j ) is the injury center position at the jth time point.

[0114] The moving speed of the injured part from the jth time point to the j+1th time point is as follows:

[0115]

[0116] Among them, Δt j is the time difference between the jth time point and the j+1th time point.

[0117] In a specific embodiment, the moving direction may be represented by a direction angle of a velocity vector.

[0118] The direction angle θ of the moving direction j as follows:

[0119] θ j =arctan2(Δdx j , Δdy j ) (13)

[0120] Among them, θ j The value range is [-π, π].

[0121] The present invention determines the position of the damage center of the plurality of target part images collected at a plurality of time points to calculate the position difference of the damage center at adjacent time points, determines the moving speed and moving direction of the damage center according to the position difference, and obtains the moving trajectory of the damage center, thereby further determining the irradiation range of the X-ray, focusing the X-ray to the target area more quickly, realizing precise control of the X-ray irradiation, and reducing the radiation damage of the X-ray to the patient.

[0122] Specifically, in step S4, it includes:

[0123] According to the movement parameters of the damage center and the damage radius, the location of the damage area at each time point is determined;

[0124] The positions of the damaged area at several time points are superimposed to obtain the moving radius of the damaged area.

[0125] It is understandable that in order to obtain the moving radius of the damaged area, the damage boundary of the damaged area at several time points needs to be considered, and the moving radius is the maximum distance from the damage boundary at the initial time point to the damage boundary at the last time point.

[0126] In a specific embodiment, the maximum moving distance of the damage center position at several time points is calculated to estimate a comprehensive moving radius. The moving radius determination formula is as follows:

[0127]

[0128] in, is the maximum moving distance of the damage center, (x t ,y t ) is the damage center position at the tth time point, (x u ,y u ) is the position of the injury center at the u-th time point.

[0129] The present invention determines the position of the damaged area at each time point, and superimposes the positions of the damaged area at each time point to obtain the moving radius of the damaged area, thereby further determining the irradiation range of the X-ray, focusing the X-ray to the target area more quickly, achieving precise control of the X-ray irradiation, and reducing the radiation damage of the X-ray to the patient.

[0130] Specifically, in step S5, the shape of the X-ray irradiation range is determined according to the movement parameter of the damage center, including:

[0131] If the movement parameter of the damage center is linear movement, the shape of the X-ray irradiation range is rectangular;

[0132] If the movement parameter of the damage center is nonlinear movement, the shape of the X-ray irradiation range is circular or elliptical.

[0133] It is understandable that when the movement parameter of the injury center is linear movement, it proves that the patient moves approximately in a straight line within a period of time, so a rectangle is selected as the shape of the X-ray irradiation range. Similarly, when the movement parameter of the injury center is nonlinear movement, it is more appropriate to select a circular or elliptical X-ray irradiation range, which can better ensure that the injured part of the target object is fully irradiated compared to a rectangular shape.

[0134] It is understandable that the X-ray beam generated by the X-ray machine itself is divergent, but in practical applications, the divergence angle and shape of the X-ray can be limited by certain technical means. In practice, a collimator can be used to reduce the divergence angle of the X-ray beam and make its shape closer to parallel light, thereby forming a relatively uniform irradiation area at a longer distance. In addition, the irradiation shape can be further controlled by adjusting the position, angle and focusing method of the X-ray source.

[0135] The present invention determines the shape of the X-ray irradiation range according to the movement parameter of the damage center, thereby further determining the X-ray irradiation range, focusing the X-ray to the target area more quickly, achieving precise control of the X-ray irradiation, and reducing the radiation damage of the X-ray to the patient.

[0136] Specifically, in step S5, determining the irradiation radius of the X-ray includes: determining the irradiation radius according to the moving radius and the damage radius.

[0137] It can be understood that the irradiation range of the X-ray can be determined according to the moving direction and moving radius of the damage center, and the irradiation range includes the irradiation center and the irradiation radius. The irradiation center can be the damage center in the target part image collected at a time before the X-ray irradiation starts, and then the irradiation radius of the X-ray can be determined according to the maximum damage radius of the damage area of ​​several target part images and the moving radius of the target object.

[0138] In a specific embodiment, the maximum moving distance R0 of the injury center position at a certain time point is set as the position deviation, and the formula for the irradiation radius of the X-ray is as follows:

[0139] R=R0+r max (15)

[0140] Among them, r max is the maximum damage radius at several time points.

[0141] The present invention determines the irradiation radius according to the moving radius and the damage radius, thereby further determining the irradiation range of the X-ray, focusing the X-ray to the target area more quickly, achieving precise control of the X-ray irradiation, and reducing the radiation damage of the X-ray to the patient.

[0142] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A radiographic image control method based on image analysis, characterized in that: include: Step S1, collecting images of a target part of a target object based on a number of time points, including an apparent image and an infrared image; Step S2, determining the damage center and damage radius of the image based on the single target part image, and determining the damage area of ​​the target object according to the damage center and the damage radius; Wherein, in step S2, it includes: Step S21, dividing the target part image into different hierarchical regions based on corresponding distinguishing features; Step S22, determining the damage boundary and the damage center according to the characteristic change trend of the hierarchical region, including: respectively identifying the convergence center of the hierarchical region of the infrared image / or the concentration center of several convergence centers, and determining the convergence center / or the concentration center of several convergence centers as the damage center; wherein, the damage features in the single apparent image are extracted respectively, and the significant area of ​​the damage features is determined, based on the comparison between the significant area and the position of the damage center, the damage center is corrected according to the comparison result; Step S23, determining the damage radius according to the damage boundary and the damage center; Step S24, determining the damage area according to the damage center and the damage radius; Step S3, determining the movement parameter of the injury center based on the position change of the injury center of the plurality of target part images taken in time sequence, wherein the movement parameter includes a movement speed and a movement direction; Step S4, determining the moving radius of the damage area of ​​the target object according to the moving parameter of the damage center and the damage area; Step S5, determining the X-ray irradiation range according to the movement parameter and movement radius of the damage center, wherein the irradiation range includes the irradiation center and the irradiation radius.

2. The radiographic image control method based on image analysis according to claim 1, characterized in that: Correcting the damage center includes: determining the significant center of the significant area, and re-determining the damage center position based on the significant center position and the damage center position.

3. The radiographic image control method based on image analysis according to claim 1, characterized in that: In step S23, determining the damage radius includes: determining the distance between the injury center and the injury boundary in several directions; An average distance or a maximum distance is calculated based on the distances in the plurality of directions, and the average distance or the maximum distance is set as the damage radius.

4. The radiographic image control method based on image analysis according to claim 1, characterized in that: In step S3, the movement parameters of the damage center are determined, including: respectively determining the injury center positions of the plurality of target part images acquired at a plurality of time points; Calculate the position difference of the injury center at adjacent time points respectively; The moving speed and moving direction of the damage center are determined according to the position difference.

5. The radiographic image control method based on image analysis according to claim 1, characterized in that: In step S4, it includes: According to the movement parameters of the damage center and the damage radius, the location of the damage area at each time point is determined; The positions of the damaged area at several time points are superimposed to obtain the moving radius of the damaged area.

6. The radiographic image control method based on image analysis according to claim 1, characterized in that: In step S5, the shape of the X-ray irradiation range is determined according to the movement parameter of the damage center, including: If the movement parameter of the damage center is linear movement, the shape of the X-ray irradiation range is rectangular; If the movement parameter of the damage center is nonlinear movement, the shape of the X-ray irradiation range is circular or elliptical.

7. The radiographic image control method based on image analysis according to claim 1, characterized in that: In step S5, the irradiation radius of the X-ray is determined, including: determining the irradiation radius according to the moving radius and the damage radius.

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