Radiographic methods, systems and media

Abstract

The present invention belongs to the field of radiographic imaging technology, and in particular, relates to a radiographic imaging method, system and medium; the method comprises: obtaining a real-time image of an object to be detected in front of a detector; identifying the real-time image, determining the area corresponding to the detector to obtain an image detector area, and determining the area corresponding to the object to be detected to obtain an image object area; determining a first position relationship between the object to be detected and the detector according to the image object area and the image detector area; determining the displacement that the object to be detected needs to move based on the first position relationship; and sending an exposure signal when the displacement that the object to be detected needs to move is less than a threshold. Determining the exposure start time according to the degree of overlap effectively solves the problems in the prior art that a technician needs to adjust the relative position between the object to be detected and the detector or ionization chamber based on experience around the object to be detected, over-reliance on the technician's experience, and easy to cause poor imaging quality or low imaging efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of radiographic imaging, and in particular relates to a radiographic imaging method, system and medium. Background Art

[0002] The detector is an indispensable device for digital radiography. In digital X-ray imaging technology with automatic exposure control, both the detector and the automatic sensing exposure area are indispensable. At present, in digital X-ray imaging equipment with automatic exposure control, the ionization chamber and the detector are integrated, or the automatic exposure control board with the ionization chamber and the detector are separated. During inspection, the automatic exposure control board is temporarily fixed in front of the detector (between the detector and the object to be inspected). During inspection, the object to be inspected is positioned according to the position of the ionization chamber to achieve good quality imaging using automatic exposure control.

[0003] When the object to be detected is in front of the detector, the detector is usually partially or completely blocked, so that the detector cannot be directly observed from the radiation source side, and the relative position relationship between the detector and the object to be detected cannot be determined, and the relative position relationship between the object to be detected and the ionization chamber cannot be determined. Therefore, whether automatic exposure control is adopted or not, professional technicians are required to observe and assist the object to be detected to move and position according to experience, so that the object to be detected corresponds to the radiation receiving area of ​​the detector, or the object to be detected corresponds to the position of the ionization chamber, but this increases the workload of the technician and depends on the experience of the technician. Moreover, if the object to be detected moves after the positioning is completed, the technician needs to promptly discover and readjust the position of the object to be detected, otherwise it will affect the imaging quality. Even if the position of the object to be detected is discovered and readjusted in time, it will also affect the work efficiency. In actual detection, there are still some situations where the object to be detected is not suitable for movement, or the number of times the object to be detected needs to be moved due to the detector is as little as possible. At this time, if most or all of the detector is blocked by the object to be detected, it is necessary to rely on experience to obtain the radiographic image. If there is no experienced technician, effective radiographic images may not be obtained.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] The applicant found that whether or not automatic exposure control is used, professional technicians are required to observe and assist the object to be detected to move and position according to experience, so that the object to be detected and the detector meet a specific relative position, which makes radiographic imaging highly dependent on the experience of technicians, and the imaging quality and efficiency are easily affected by whether the object to be detected moves after positioning. In particular, the inability to accurately find the radiation sensing area of ​​the detector or determine the position of the ionization chamber after the detector is blocked by the object to be detected will limit the use of the automatic exposure control function. If the automatic exposure control function is not used, the technician must have skilled operating skills to shoot radiographic images, otherwise the imaging quality will not meet the standard or even overexposure will cause excessive radiation to the object to be detected.

[0006] In order to solve the above technical problems, the present application aims to propose a radiographic imaging method, system and storage medium, which obtains the real-time image in front of the detector, identifies the image detector area and the image object area from the real-time image, and thereby determines the degree of overlap between the detector and the object to be detected, and determines the exposure start time according to the degree of overlap, thereby effectively solving the problems in the prior art that require technicians to adjust the relative position between the object to be detected and the detector or ionization chamber based on experience around the object to be detected, which is too dependent on the technician's experience and easily causes poor imaging quality or low imaging efficiency.

[0007] The technical solution of the present invention is as follows:

[0008] In one aspect of the present invention, a radiographic imaging method is provided, the method comprising the following steps:

[0009] Acquire a real-time image of the object to be detected in front of the detector;

[0010] Identify the real-time image, determine the area corresponding to the detector to obtain an image detector area, and determine the area corresponding to the object to be detected to obtain an image object area;

[0011] Determine a first positional relationship between the object to be detected and the detector according to the image object area and the image detector area;

[0012] Determining the displacement that the object to be detected needs to move based on the first position relationship;

[0013] When the displacement required to be moved by the object to be detected is less than a threshold, an exposure signal is issued.

[0014] Furthermore, it also includes:

[0015] Selecting an automatic exposure control area in the image object area according to the inspection requirements of the object to be inspected;

[0016] Determining an automatic sensing exposure area in the detector corresponding to the automatic exposure control area according to a corresponding relationship between the detector and the image detector area;

[0017] During exposure, the exposure stop timing is determined by the automatic sensing exposure area.

[0018] Furthermore, the step of identifying the real-time image and determining the area corresponding to the detector to obtain the image detector area includes:

[0019] A feature identifier of the detector in the real-time image is identified, and a region corresponding to the detector in the real-time image is determined based on the feature identifier to obtain the image detector region.

[0020] Further, the characteristic identification includes an image of an extension arm disposed on the detector and extending in a direction away from the detector in the real-time image;

[0021] The step of determining the area corresponding to the detector in the real-time image based on the feature identifier to obtain the image detector area includes:

[0022] Determining the image detector area according to a preset relative position relationship between the extension arm and the detector, and a position of the feature marker in the real-time image;

[0023] or,

[0024] The image detector area is determined according to a preset relative position relationship and a preset size ratio relationship between the extension arm and the detector, and a position of the feature marker in the real-time image and a corresponding area.

[0025] Further, determining the first positional relationship between the object to be detected and the detector based on the image object area and the image detector area specifically includes: determining the overlapping relationship between the object to be detected and the detector based on an overlapping area between the image object area and the image detector area.

[0026] Further, determining the displacement that the object to be detected needs to move based on the first position relationship includes:

[0027] Determining the correspondence between the pixel length in the real-time image and the physical length of the detector according to the size of the image detector area and the preset detector size;

[0028] The direction and distance that the object to be detected needs to move are determined according to the distance between the center of the image object area and the center of the image detector area, and the corresponding relationship between the pixel length in the real-time image and the physical length of the detector.

[0029] Furthermore, during exposure, determining the exposure stop timing by the automatic sensing exposure area specifically includes:

[0030] Determining a brightness indication threshold of the automatic exposure control area according to the inspection requirements of the object to be inspected;

[0031] Acquire the real-time brightness and darkness value of the automatic sensing exposure area during exposure,

[0032] The real-time brightness value is compared with the brightness indication threshold, and when the real-time brightness value reaches the brightness indication threshold, the exposure is stopped.

[0033] Another aspect of the present invention provides a radiographic imaging system, comprising:

[0034] An image collector is used to obtain a real-time image of the object to be detected in front of the detector;

[0035] An image recognition processor is used to recognize the real-time image, determine the area corresponding to the detector to obtain an image detector area, and determine the area corresponding to the object to be detected to obtain an image object area;

[0036] a correspondence processor, configured to determine a first positional relationship between the object to be detected and the detector according to the image object area and the image detector area;

[0037] The exposure control processor is used to determine the displacement that the object to be detected needs to move based on the first position relationship, and to send an exposure signal when the displacement that the object to be detected needs to move is less than a threshold.

[0038] Furthermore, it also includes:

[0039] A display, configured to display the real-time image, and to display the image object area and the image detector area in the real-time image;

[0040] An input device for selecting an automatic exposure control area in the image object area;

[0041] The exposure control processor is also used to determine the automatic sensing exposure area on the detector corresponding to the automatic exposure control area based on the corresponding relationship between the detector and the image detector area, and to determine the exposure stop timing through the automatic sensing exposure area during exposure.

[0042] According to another aspect of the present invention, a computer storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the method steps as described above are implemented.

[0043] The radiographic imaging method, system and storage medium of the detector of the present invention address the problems that the existing method in which technicians adjust the relative position between the object to be detected and the detector or ionization chamber based on their experience is too dependent on the technicians' experience, resulting in limited use scenarios of radiographic imaging, and the imaging quality and efficiency are easily affected by whether the object to be detected moves after being positioned. In particular, the detector cannot accurately find the radiation sensing area of ​​the detector or cannot determine the position of the ionization chamber due to being blocked by the object to be detected, which will limit the use of the automatic exposure control function. Taking radiographic images without using the automatic exposure control function requires the technician to have skilled operating skills, otherwise the imaging quality will not meet the standards or even overexposure will cause excessive radiation to the object to be detected. The radiographic imaging method, system and storage medium of the detector of the present invention include the following steps: obtaining a real-time image of the object to be detected in front of the detector; identifying the real-time image, determining the area corresponding to the detector to obtain the image detector area, and determining the area corresponding to the object to be detected to obtain the image object area; determining the first positional relationship between the object to be detected and the detector according to the image object area and the image detector area; determining the displacement that the object to be detected needs to move based on the first positional relationship; and sending an exposure signal when the displacement that the object to be detected needs to move is less than a threshold. By obtaining the real-time image in front of the detector, identifying the image detector area and the image object area from the real-time image, and determining the overlap between the detector and the object to be detected, and determining the exposure start time according to the overlap, the prior art effectively solves the problem that the technician needs to adjust the relative position between the object to be detected and the detector or ionization chamber based on experience around the object to be detected, which easily causes poor imaging quality or low imaging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of this application, and do not constitute a limitation of the present invention.

[0045] Figure 1 A schematic flow chart of an embodiment of the radiographic imaging method of the present invention is shown.

[0046] Figure 2 An exemplary structural schematic diagram (stereoscopic diagram) of the extension arm of the present invention after being connected to the detector is shown.

[0047] Figure 3 A schematic diagram (top view) of an exemplary structure of the extension arm after being connected to the detector in the present invention is shown.

[0048] Figure 4 A schematic diagram (top view) of an exemplary structure after the extension arm of the present invention is connected to the detector is shown.

[0049] Figure 5 An exemplary structural schematic diagram (stereoscopic diagram) of the extension arm of the present invention after being connected to the detector is shown.

[0050] Figure 6 A schematic diagram (top view) of an exemplary structure of the extension arm after being connected to the detector in the present invention is shown.

[0051] Figure 7 An exemplary structural schematic diagram (stereoscopic diagram) of the extension arm of the present invention after being connected to the detector is shown.

[0052] Figure 8 An exemplary structural schematic diagram (stereoscopic diagram) of the extension arm of the present invention after being connected to the detector is shown.

[0053] Fig. 9 Another schematic flow chart of the radiographic imaging method of the present invention is shown.

[0054] Fig.10 A schematic diagram of a process of determining the automatic sensing exposure area in the detector corresponding to the automatic exposure control area in the radiographic imaging method of the present invention is shown.

[0055] Fig.11 A schematic flow chart of determining the exposure stop timing by the automatic sensing exposure area during exposure in the radiographic imaging method of the present invention is shown.

[0056] Fig.12 A structural schematic diagram (electrical connection block diagram) of an embodiment of the radiation imaging system of the present invention is shown. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0058] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solutions according to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0059] It should be emphasized that the term "include / comprise" when used herein refers to the presence of a feature, element, step or component, but does not exclude the presence or addition of one or more other features, elements, steps or components. The terms "upper", "lower", "horizontal", "vertical", etc. in this application are only relative to the corresponding views, and do not limit the state, position, etc. when used.

[0060] Some embodiments of a radiographic imaging method, system, and storage medium are described below. It should be understood that these embodiments are presented only to provide the reader with a brief summary of some forms that the present invention may take, and these embodiments are not intended to limit the scope of the present invention. In fact, the present invention may include a variety of embodiments or aspects not described below.

[0061] In digital radiographic imaging, the object to be detected needs to be in the corresponding radiation receiving area of ​​the detector in the corresponding posture in order to receive the radiation beam from a specific direction and a specific dose, forming an effective radiographic image. Ensuring that the object to be detected is in the corresponding radiation receiving area of ​​the detector in the corresponding posture is the basis for forming an effective radiographic image. At the same time, determining the radiation dose also affects the imaging effect.

[0062] There are currently two ways to determine the radiation dose. One is non-automatic exposure control: the technician sets the exposure power, duration and other parameters based on experience. After the exposure starts, the system determines the time to stop the exposure of the radiation source based on the set duration. The other is automatic exposure control: an ionization chamber that is separate from or integrated with the detector is set at a fixed position in front of the detector. The technician sets the ionization current threshold of the ionization chamber before the exposure starts. After the exposure starts, the ionization chamber generates an ionization current. When the ionization current it receives reaches the ionization current threshold, it sends a stop exposure signal to the radiation source.

[0063] The current method for adjusting the posture of the object to be detected and the corresponding position with the detector is that the technician determines the position of the radiation receiving area of ​​the detector based on experience, adjusts the posture of the object to be detected, and then helps the object to be detected move to the corresponding position through contact-type pushing, pulling and other guiding methods. In the case of using automatic exposure control, when adjusting the position of the object to be detected, the technician not only needs to ensure that the object to be detected is in the radiation receiving area of ​​the detector, but also needs to ensure that the specific area of ​​the object to be detected completely covers the ionization chamber in front of the detector, so that the specific area of ​​the object to be detected is highly corresponding to the ionization chamber.

[0064] For the above two methods of determining the radiation dose, whether or not automatic exposure control is used, the imaging quality depends on the technician's experience. Because if the object to be detected is not in the radiation receiving area of ​​the object to be detected, it may cause the missing of parts in the formed radiation image, poor imaging quality, and even the need for multiple exposures. In particular, when using automatic exposure control, if a specific area of ​​the object to be detected does not correspond to the ionization chamber in a high degree, it will cause insufficient or overexposure of the radiation dose, resulting in poor imaging quality, unusable imaging, the need for multiple exposures, and the object to be detected being subjected to excessive radiation. Because when using automatic exposure control, it is necessary to ensure that the object to be detected is in the radiation receiving area of ​​the detector, and that certain specific areas of the object to be detected correspond to the ionization chamber in a high degree, and the ionization chamber has a small area and is often blocked by the object to be detected, which requires the technician to adjust the position of the object to be detected many times. If the object to be detected cannot be moved at this time, the automatic exposure control cannot be used, which will also cause the inability to use the automatic exposure control to obtain the radiation image or the obtained radiation image is unusable, and even the object to be detected is subjected to excessive radiation.

[0065] To solve the above problems, the applicant has proposed a radiographic imaging method, system and computer storage medium. The radiographic imaging method and the radiographic imaging system described in this embodiment can be used for X-ray imaging, other radiographic imaging, two-dimensional imaging and three-dimensional imaging. The present invention is introduced below by taking two-dimensional X-ray digital imaging as an example. Embodiment 1

[0066] Figure 1 , Fig. 9 It is a schematic flow chart of the radiographic imaging method provided by the present application. The basic idea of ​​the radiographic imaging method is that when the object to be detected is in front of the detector, the real-time image at the detector is obtained, the degree of overlap between the object to be detected and the detector is determined by the real-time image, and whether to move the object to be detected or start exposure is determined according to the degree of overlap. This method makes it possible to eliminate the need for a technician to observe around the object to be detected whether the position between the object to be detected and the detector corresponds. When they do not correspond, it is not necessary for the technician to physically contact the object to be detected to assist the object to be detected in moving to the detection position of the detector. When the device for acquiring the real-time image is fixed on the X-ray source, it is possible to observe the overlap between the object to be detected and the detector at the emission source of the X-ray beam, ensure the consistency and availability of the overlap result and the direction of radiation irradiation, ensure the accuracy of the radiation penetrating the area of ​​the object to be detected, and thus ensure the integrity of the imaging and the high quality of the image.

[0067] like Figure 1 As shown, the radiographic imaging method provided in this embodiment includes the following steps:

[0068] S1: Acquire a real-time image of the object to be detected in front of the detector;

[0069] S2: Identify the real-time image, determine the area corresponding to the detector to obtain an image detector area, and determine the area corresponding to the object to be detected to obtain an image object area;

[0070] S3: determining a first positional relationship between the object to be detected and the detector according to the image object area and the image detector area;

[0071] S4: determining the displacement that the object to be detected needs to move based on the first position relationship;

[0072] S5: sending an exposure signal when the displacement required to be moved by the object to be detected is less than a threshold.

[0073] This embodiment adopts the method of acquiring the real-time image at the detector after the object to be detected is in front of the detector, respectively identifying the image detector area and the image object area corresponding to the detector and the object to be detected from the real-time image, and then judging whether the object to be detected is in the radiation receiving area of ​​the detector based on the first positional relationship between the image detector area and the image object area, so as to determine whether to perform exposure imaging according to the judgment result: if the object to be detected is not in the radiation receiving area of ​​the detector, or the deviation between the two is large, the direction and distance that the object to be detected needs to move are prompted; if the object to be detected is in the radiation receiving area of ​​the detector, exposure is started. Based on this, it is realized that the displacement that the object to be detected needs to move is determined by relying on the image, without the need for the technician to determine whether the object to be detected is highly corresponding to the detector or the ionization chamber based on experience. The imaging quality and efficiency are ensured, and repeated exposure is avoided.

[0074] In this embodiment, the direction and distance that the object to be detected needs to move can be prompted by voice broadcast. The solution of the present invention is combined with a voice system to remotely command the object to be detected to move without having to go around the object to be detected to assist its movement, further improving the positioning efficiency and imaging speed, and realizing remote control of radiation detection, solving the problem of scarcity of imaging technicians, and preventing imaging technicians from entering the exposure room and being exposed to radiation.

[0075] For step S1, in this embodiment, the position of the camera for acquiring the real-time image is preferably connected to the radiation source to ensure the consistency of the optical path from the radiation beam to the detector and the optical path from the camera to the detector, thereby ensuring the availability of the overlapping area between the detector and the object to be detected determined by the real-time image.

[0076] In this embodiment, the method of obtaining the real-time image can be: obtaining continuous images at the detector at a certain frequency, and after the object to be detected is in front of the detector, extracting the current frame image as the real-time image, and determining the first position relationship based on the real-time image of the current frame. When it is determined based on the real-time image of the current frame that the displacement of the object to be detected is not less than a threshold value, the object to be detected is moved by voice reminders, playing videos to the inspector, etc., and extracting the image of the object to be detected after the movement as the real-time image, re-identifying, determining the first position relationship, etc., until the displacement of the object to be detected is less than the threshold value, the exposure signal is issued. The digital radiographic imaging system enters the exposure stage based on the exposure signal, or prompts the technician to start exposure based on the exposure signal after the positioning preparation is completed.

[0077] Regarding step S2, in this embodiment, the step of identifying the real-time image and determining the area corresponding to the detector to obtain the image detector area includes:

[0078] A feature identifier of the detector in the real-time image is identified, and a region corresponding to the detector in the real-time image is determined based on the feature identifier to obtain the image detector region.

[0079] In this embodiment, the feature identifier of the detector in the real-time image is identified by using an image recognition method to determine the area corresponding to the detector in the image. The image object area is obtained by identifying the area corresponding to the object to be detected in the real-time image, and the image recognition method is used to determine the area corresponding to the object to be detected in the image. The method used in image recognition can be a recognition method based on deep learning or a recognition method based on other machine learning. Those skilled in the art can choose according to their needs, and will not be described in detail here.

[0080] In this embodiment, an extension arm extending away from the detector is provided on the side of the detector. The characteristic mark includes an image of the extension arm provided on the detector and extending away from the detector in the real-time image.

[0081] In this embodiment, determining the area corresponding to the detector in the real-time image based on the feature identifier to obtain the image detector area includes:

[0082] Determining the image detector area according to a preset relative position relationship between the extension arm and the detector, and a position of the feature marker in the real-time image;

[0083] or,

[0084] The image detector area is determined according to a preset relative position relationship and a preset size ratio relationship between the extension arm and the detector, and a position of the feature marker in the real-time image and a corresponding area.

[0085] This application increases the occupied area of ​​the "detector" and reduces the possibility of the "detector" being blocked by setting the extension arm extending away from the detector (extending outward) around the detector, and then determines the position of the detector in combination with the preset relative position relationship between the detector and the extension arm, or the preset relative position relationship and the preset size ratio relationship, so as to facilitate the technician to determine the relative position relationship between the object to be detected and the detector, so that the technician can determine whether to directly expose, or readjust the position of the object to be detected, or remotely guide the object to be detected to adjust the position, or use automatic exposure control for radiographic imaging. This application ensures the determinability of the detector position by increasing the occupied area of ​​the "detector", reduces the error rate of exposure operation, ensures imaging quality, and improves imaging efficiency.

[0086] like Figures 2 to 8 As shown, in this embodiment, in order to realize the identification of the area corresponding to the detector from the real-time image, an extension arm 11 extending in the direction away from the detector 2 is provided on the detector 2, and there is a preset relative position relationship between the extension arm and the detector, or there is a preset relative position relationship and a preset size ratio relationship between the extension arm and the detector, and the extension arm is used to determine the position of the detector according to its position and the preset relative position relationship.

[0087] like Figures 2 to 8 As shown, in this embodiment, the extension arm 11 extending in the direction away from the detector is arranged on the detector 2, and there is a preset relative position relationship between the extension arm and the detector, or there is a preset relative position relationship and a preset size ratio relationship between the extension arm and the detector; by arranging the extension arm extending in the direction away from the detector (extending outward) around the detector, the occupied area of ​​the "detector" is increased, and the possibility of the "detector" being blocked is reduced, and the position of the detector is determined in combination with the preset relative position relationship between the detector and the extension arm, or the preset relative position relationship and the preset size ratio relationship, so as to facilitate the determination of the relative position relationship between the object to be detected and the detector according to the real-time image, so that the operator can determine whether to directly expose, or readjust the position of the object to be detected, or remotely guide the object to be detected to adjust the position, or use automatic exposure control for radiographic imaging. This application ensures the determinability of the detector position by increasing the area occupied by the "detector", ensures that the image detector area can be identified, and is conducive to reducing the error rate of exposure operation, ensuring imaging quality, and improving imaging efficiency.

[0088] In this embodiment, the extension arm and the detector may have a preset relative position relationship, and the position of the detector may be directly inferred based on the preset relative position relationship. Alternatively, the extension arm and the detector may have a preset relative position relationship and a preset size ratio relationship, and the position of the detector may be inferred by combining the preset relative position relationship and the preset size ratio relationship.

[0089] When the extension arm and the detector only have a preset relative position relationship, the number of the extension arms is usually multiple, and the multiple extension arms are correspondingly installed on at least two sides of the detector. Figure 2 As shown, two extension arms are respectively arranged on opposite sides of the detector, and the edges of the two extension arms on one side are respectively aligned with the upper and lower sides of the detector; or as shown Figure 3 As shown, three extension arms 11 are arranged on two opposite sides of the detector, wherein two extension arms 11 arranged on one side are arranged at the upper and lower ends of the detector; or as shown Figure 4 As shown, an extension arm 11 is provided at each of the four corners of the detector. The preset relative position relationship can be set by those skilled in the art as required, so that the position relationship of the detector can be determined based on the observed extension arm, and will not be described in detail here.

[0090] When the extension arm and the detector have a preset relative position relationship and a preset size ratio relationship, the width and length of the detector can be inferred based on the observed width or length of the extension arm. Based on this, combined with the preset relative position relationship, only a small number of extension arms need to be observed to determine the position of the detector. In this case, a small number of extension arms are required, for example, Figure 5 As shown in the figure, only one extension arm 11 is provided and the extension arm 11 is provided in the middle of one side of the detector 2. Of course, when the preset size ratio is provided, other layouts can be provided, or other numbers of extension arms 11 can be provided. Those skilled in the art can provide the arrangements as required, and no further details will be given here.

[0091] In this embodiment, when the position of the detector is determined according to the extension arm, if there are at least two extension arms, and each of the extension arms is arranged along the boundary of the detector, for example Figures 2 to 4If the layout is set up in a certain manner, the position of the detector can be determined by the position of each extension arm and the preset relative position relationship, only corresponding extension operations are required, without the need for a size ratio relationship between the extension arm and the detector; if there is only one extension arm, it is necessary to determine the boundary of the detector in the width direction of the extension arm by the size ratio relationship between the extension arm and the detector and the corresponding ratio of the observed extension arm width in the upward and downward directions, and then determine the boundary of the detector in the length direction of the extension arm according to the position of the extension arm and the size of the detector.

[0092] In this embodiment, the extension arm and the detector have a preset relative position relationship, or a preset relative position relationship and a preset size ratio relationship between the extension arm and the detector; the position of the detector can be accurately determined based on the multiple extension arms set at specific relative positions, or any number of extension arms with a preset size ratio relationship and a preset relative position relationship, and the extension arm is a physical entity with identifiability, so the position of the detector can be determined by naked eye observation, or the position of the detector in the image can be determined by taking a photo. The method of determining the position of the detector through an image helps to ensure the accuracy of the position of the detector.

[0093] like Figures 2 to 8 As shown, the extension arm described in this embodiment can have various styles.

[0094] For example, it can be Figures 2 to 5 In the style shown in FIG. 1 , the extension arm 11 of this style includes a base 111 connected to the edge of the detector 2, and a steering rod 112 installed corresponding to the base 111. The steering rod 111 is rotated to adjust the angle between the steering rod 111 and the plane where the detector 2 is located. Figure 3 to Figure 4 As shown, in this embodiment, in order to facilitate the adjustment of the number and installation position of the steering rods 112, a plurality of bases are arranged along the circumference of the detector. When in use, the steering rods can be adjusted to be connected to any of the bases as needed.

[0095] In this embodiment, the design of the extension arm of this style including the base and the steering rod allows the steering rod to rotate to adjust the angle between the steering rod 112 and the plane where the detector is located, thereby coordinating the items of the radiographic inspection and the size of the object to be inspected, and increasing the scope of application of the positioning auxiliary device of the detector of the present application. For example, if the object to be inspected is covered with a large flexible coat, the overly fat coat may have a greater impact on the determination of the relative position between the object to be inspected and the detector. By making the extension arm perpendicular to the plane where the detector is located, the object to be inspected can be limited to the space formed by the extension arm, and the accuracy of the determined detector position can be improved to a certain extent, and even the accuracy of the relative position between the determined detector and the object to be inspected can be improved. For another example, if the inspection item is a three-dimensional inspection that requires the X-ray beam to be directed to the detector from different angles, it can be observed from the X-ray source, and the angle between the X-ray source and the detector can be determined according to the distortion of each of the extension arms in the observed picture. In this embodiment, in order to reduce the factors or calculations that need to be considered when determining the detector position based on the extension arm, the plane where the axis of each extension arm is located can be set parallel to the detector surface to ensure the accuracy of determining the detector position; preferably, the upper surface of each extension arm is in the same plane as the detector surface.

[0096] like Figure 6As shown, another style of the extension arm provided in this embodiment, the extension arm 11 of this style includes an extension rod 141 installed on the side of the detector 2, and the plane where the extension rod 141 is located is parallel to the plane where the detector 2 is located, and a first scale 142 is provided on the rod body along the length direction of the extension rod 141. The first scale 142 can be set starting from the end of the end of the extension rod connected to the detector, or it can be set at a certain distance from the end connected to the detector, and of course the certain distance is known. The extension arm of this style determines the position of the detector according to the value (scale value) of the first scale that is not blocked. Of course, at this time, the number of extension rods 141 can be one or more. When it is one, the position of the detector is determined according to the preset relative position between the extension rod and the detector and the first scale value 142 that is not blocked. When there are multiple extension rods, if there are extension rods on each side of the detector and they can all be identified, the position of the detector can be directly determined according to the scale values ​​of the unblocked parts of each extension rod; if the extension rod is connected to part of the edge of the detector or only the scale values ​​of part of the extension rod can be identified, the position of the detector can be determined according to the scale value of the identified extension rod and the preset installation position of the extension rod, and / or the preset size ratio relationship between the detector and the extension rod. In this embodiment, in order to facilitate the determination of the distance between the observation position and the detector according to the width of the extension rod, and then accurately determine the position of the detector, it is selected to set the extension rod transverse width mark at the end of the extension rod away from the detector, and the transverse mark 143 is marked at the end of the extension rod away from the detector, and the marking direction is different from the first scale direction. In order to facilitate the reading of the scale value of the first scale, the color of the scale line and the scale value generally has a large contrast with the color of the extension rod, such as black and white, red and white, etc. The width of the extension rod can also be increased, and the size of the scale value can be limited. Those skilled in the art can set the scale lines and scale values ​​of the first scale, the color of the extension rod, and the sizes of the extension rod, the scale lines, and the scale values ​​as needed, which will not be elaborated herein.

[0097] In this embodiment, the extension arm may include a first rod and a second rod arranged at an angle, the first rod and / or the second rod being arranged parallel to the plane where the detector is located; the length of the first rod and / or the second rod is a preset length, or a second scale is provided on the first rod and / or the second rod. Figure 7 and Figure 8 The extension arm of this style is briefly described.

[0098] like Figure 7As shown, the extension arm includes a first rod body 151 and a second rod body 152 set at an angle, and the first rod body 151 and the second rod body 152 are both set parallel to the plane where the detector 2 is located; the first rod body and / or the second rod body has a preset length and a preset width, and the second rod body is provided with a second scale 1521.

[0099] like Figure 8 As shown, the extension arm 11 includes a first rod 161 and a second rod 162 arranged at an angle, the first rod 161 and the second rod 162 are arranged parallel to the plane where the detector 2 is located; and a second scale 1611 is provided on the first rod and the second rod.

[0100] In this embodiment, the angle between the first rod and the second rod can be any angle value. The first rod and the second rod are set at an angle, which increases the area occupied by the extension arm and facilitates the rapid identification of the extension arm. Preferably, the first rod is perpendicular to the second rod. When in use, the extension arm is placed at the corner of the detector, and the first rod and the second rod are parallel to the two sides adjacent to the detector; so that the detector can be determined in which "quadrant" of the area divided by the extension arm through one extension arm, and the position of the detector can be determined by combining other known information, reducing the demand for the number of extension arms and helping to reduce costs.

[0101] In order to more accurately determine the position of the detector by using a smaller number of the extension arms, the two sides of the first rod and the second rod adjacent to the detector are collinear. Figure 7 As shown, the right side of the first rod is collinear with the right side of the detector, and the upper side of the second rod is collinear with the upper side of the detector. Figure 8 As shown, the left side of the first rod body is collinear with the right side of the detector, and the upper side of the second rod body is collinear with the upper side of the detector. This collinear relationship is part of the preset relative position relationship. Through this design, only one extension arm is needed to determine the position of the adjacent two sides of the detector, which helps to quickly and accurately determine the position of the detector.

[0102] This embodiment adopts the design of preset relative position relationship and preset size ratio relationship. According to the multiple extension arms set at specific relative positions, or any number of extension arms with preset size ratio relationship and preset relative position relationship, the position of the detector can be accurately determined. The extension arm is a physical entity with identifiability. Therefore, the position of the detector can be determined by naked eye observation, or the position of the detector in the image can be determined by taking a photo, such as by determining the coordinates of the four corners of the detector in the image or the center coordinates and length and width parameters of the detector. The diversity of the methods for determining the position of the detector is guaranteed, and the method of determining by image also helps to ensure the accuracy of the determined position of the detector.

[0103] like Figures 2 to 8 As shown, in this embodiment, one end of the extension arm is connected to the edge of the detector via a detachable connector, and the other end is extended in a direction away from the detector.

[0104] In this embodiment, the detachable connecting piece is used to realize that the extension arm can be removed through the detachable connecting piece when the extension arm is not needed. The detachable connecting piece is used to connect the detector and the extension arm, so that the disassembly, transportation, maintenance and replacement of the two are more convenient, and the convenience of use is improved. A positioning auxiliary device of the detector can also be used on different detectors at different times, which also controls the cost to a certain extent.

[0105] The detachable connector in this embodiment can have various styles, such as Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 As shown, the detachable connector includes a mounting sleeve 121 that matches the shape of the detector side, and the extension arm is connected to the outer wall of the mounting sleeve 121. Figure 5 , Figure 8 As shown, the detachable connector includes a mounting card 131 correspondingly connected to the side of the detector.

[0106] like Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7As shown, when the detachable connector is the mounting sleeve 121, the extension arm and the mounting sleeve are relatively fixed, which limits the relative position between the extension arm and the detector to a certain extent. In order to reduce the limitation of the relative position between the extension arm and the detector by the mounting sleeve, the mounting sleeve can be annular and tightly wrapped on the side of the detector. At the same time, the mounting sleeve has a certain flexibility, and can move along the circumference of the side wall of the detector when it is subjected to sufficient external force while tightly wrapping on the detector. Those skilled in the art can determine the material of the mounting sleeve according to the number and weight of the extension arms, as well as the size of the external force required to move the mounting sleeve to the covering position on the detector in order to adjust the relative position between the extension arm and the detector, which will not be described in detail here.

[0107] like Figure 5 , Figure 8 As shown, when the detachable connector is a mounting card 131, the detachable connector includes a mounting card 131 provided at one end of the extension arm, and the mounting card is correspondingly engaged with the side of the detector. The mounting card has a bayonet diameter that matches the thickness of the detector. The extension arm is connected to the detector by the mounting card 131, which ensures the freedom of the installation position to a large extent. When in use, the position of the extension arm installed on the detector can be adjusted according to the size of the object to be detected. In addition, the mounting card ensures that each extension arm is independent, which facilitates the transportation and use of the detector positioning auxiliary device.

[0108] The positions and quantities of the extension arms and detectors listed in the above figures in this embodiment are only examples and do not limit their positions and quantities. Those skilled in the art can set them as needed, and will not be described in detail here. The connection method between the extension arm and the detector in this embodiment is also only an example. The extension arm can of course be fixedly connected to the detector, or other forms of detachable connectors can be used. Those skilled in the art can set the connection method between the extension arm and the detector as needed, and will not be described in detail here.

[0109] In this embodiment, determining the position of the detector can be determining the position of the entire detector or determining the position of the ray receiving area in the detector. For a detector in which the ray receiving area is at a certain distance from the edge of the detector housing, there are also differences in determining the preset relative position relationship and the preset size ratio relationship. When using, those skilled in the art can set the preset relative position relationship according to the size of the detector, the ray receiving area, etc., or set the preset relative position relationship and the preset size ratio relationship, which will not be described in detail here.

[0110] In this embodiment, the plane where the axis of each extension arm is located is arranged parallel to the detector surface, so as to reduce the factors or calculations that need to be considered when determining the position of the detector based on the extension arm. This helps to ensure the accuracy of determining the position of the detector. Preferably, the axis of each extension arm is in the same plane as the detector surface.

[0111] In this embodiment, the position of the detector is usually determined by observing from the direction of the ray source. In most inspections, the detector and the X-ray source are set to be perpendicular, that is, the center of the X-ray beam is perpendicular to the plane where the detector is located. However, there are also some inspections that require a certain angle between the X-ray source and the detector. For example, in the establishment of a three-dimensional image using X-ray digital imaging, the X-ray beam needs to be emitted to the detector from different angles. In the case where the ray source and the detector are not perpendicular, when observing the detector from the X-ray source or extending the arm, the detector or the extension arm will be distorted to a certain extent. In order to reduce the influence of the distortion on determining the position of the detector, it is necessary to determine the distance between each corner of the detector and the camera (X-ray source), or it is necessary to determine the angle between the detector and the camera (X-ray source). At this time, it can be assumed that there is a fixed angle between the extension arm and the detector, and the angle between the ray source and the detector can be determined according to the angular relationship between each of the extension arms and the detector in the real-time image, combined with the observed length of the extension arm, etc.

[0112] Regarding the above step S3, in this embodiment, determining the first positional relationship between the object to be detected and the detector according to the image object area and the image detector area specifically includes: determining the overlapping relationship between the object to be detected and the detector according to the overlapping area between the image object area and the image detector area. The overlapping relationship can be the area corresponding to each part of the object to be detected on the detector.

[0113] For the above step S4, in this embodiment, the displacement of the object to be detected that needs to be moved based on the first position relationship can be calculated manually according to the real-time image, or can be directly determined by a processing module with corresponding functions. Using a processing module with corresponding functions to implement the displacement of the object to be detected that needs to be moved based on the first position relationship includes:

[0114] Determining the correspondence between the pixel length in the real-time image and the physical length of the detector according to the size of the image detector area and the preset detector size;

[0115] The direction and distance that the object to be detected needs to move are determined according to the distance between the center of the image object area and the center of the image detector area, and the corresponding relationship between the pixel length in the real-time image and the physical length of the detector.

[0116] In this embodiment, the center of the image object area may be the image center corresponding to the center of the object to be detected, or may be the image area corresponding to the part of the object to be detected that should correspond to the center of the detector. When the center of the image object area corresponds to the center of the image detector area, the object to be detected is within the effective detection position of the detector, and it can be considered that the position adjustment has been completed at this time.

[0117] This embodiment provides a method for automatically determining the displacement that the object to be detected needs to move according to the first position relationship, which helps to ensure the accuracy of the moving position, avoids manual calculation of the displacement, and improves the detection efficiency.

[0118] like Fig. 9 As shown, the radiographic imaging method provided in this embodiment further includes the following steps:

[0119] S6: selecting an automatic exposure control area in the image object area according to the inspection requirements of the object to be inspected;

[0120] S7: determining an automatic sensing exposure area in the detector corresponding to the automatic exposure control area according to a corresponding relationship between the detector and the image detector area;

[0121] S8: during exposure, determining the exposure stop timing through the automatic sensing exposure area.

[0122] After analysis, the applicant found that, whether it is an external automatic exposure control board or a detector with an ionization chamber, the relative position between the automatic exposure control area and the detector is fixed and cannot be freely adjusted in the radiation receiving area of ​​the detector; at the same time, because the object to be detected between the detector and the radiation source will block the ionization chamber and even the radiation receiving area of ​​the detector, this has caused the radiation inspection to be highly dependent on the experience of the technician and require the object to be detected to have a high degree of self-control. Even after the experienced technician assists in positioning the object to be detected, it is easy to cause poor imaging quality or low imaging efficiency. At the same time, it also causes problems such as limited application scenarios of automatic sensing exposure. The present application adopts the correspondence between the image object area and the image detector area in the real-time image, combined with the first position relationship, to determine the correspondence between the area on the detector and the real-time image, and selects the automatic exposure control area from the real-time image according to the correspondence, so as to obtain a new automatic sensing exposure area selected in the radiation receiving area of ​​the detector. It is realized that when the first position relationship between the detector and the object to be detected is determined, the automatic exposure control area can be freely set in combination with the real-time image, the automatic sensing exposure area is correspondingly generated in the detector, and the exposure stop time is determined in combination with the automatic sensing exposure area, and an exposure stop signal is sent to the X-ray source or the detector to stop the exposure. The ray imaging method of the present application changes the operation process of automatic exposure control, and changes the existing ray imaging method of adjusting the object to be detected according to the position of the ionization chamber to match the position of the object to be detected with the ionization chamber to select the automatic exposure control area according to the position of the object to be detected in the real-time image, and the automatic sensing exposure area is generated on the detector according to the dynamic exposure control area, so as to ensure that the automatic sensing exposure area matches the position of the object to be detected, effectively ensure the imaging quality, and also ensure the convenience of operation, avoiding the problem of poor imaging quality caused by the mismatch between the automatic exposure control area and the position of the object to be detected, or even requiring multiple exposures for imaging. At the same time, the automatic selection of the automatic exposure control area in this embodiment also has the advantage that the shape and size of the automatic exposure control area can be set at will, so that according to the size and shape of the object to be detected, an automatic sensing exposure area that better matches the object to be detected can be set to obtain an image with higher imaging quality.

[0123] For the above step S6, in this embodiment, the automatic exposure control area can be selected in the image object area according to the inspection requirements of the object to be detected. This includes determining the part of the object to be detected that is suitable for receiving radiation irradiation when automatic exposure control is adopted according to the inspection content corresponding to the object to be detected, the radiation irradiation direction, and the size and position of the automatic exposure area, and then selecting the image object area corresponding to the object to be detected in the real-time image according to the part to determine the automatic exposure control area in the image object area. The automatic exposure control area can also be directly determined according to the part corresponding to the automatic sensing exposure in the existing X-ray inspection standard. For example, when examining the chest, a fixed-size area is selected in the lungs as the automatic sensing exposure area.

[0124] like Fig.10 As shown, for the above step S7, in this embodiment, according to the correspondence between the detector and the image detector area, determining the automatic sensing exposure area in the detector corresponding to the automatic exposure control area includes:

[0125] S701: Determine a first corresponding relationship between a ray receiving area of ​​the detector and an area corresponding to the detector in the real-time image; when the ray receiving area on the detector is a scintillator receiving ray, it can be understood as a one-to-one corresponding mapping relationship between the position and ratio between the scintillator pixels on the detector and the pixels of the image detector area on the real-time image;

[0126] S702: Determine the position of the automatic exposure control area in the image detector area according to the position of the automatic exposure control area in the real-time image and the position occupied by the image detector area in the real-time image;

[0127] S703: Determine the area in the detector corresponding to the automatic exposure control area according to the position of the automatic exposure control area in the image detector area and the first corresponding relationship to obtain the automatic sensing exposure area.

[0128] In this embodiment, a design is adopted in which a mapping relationship between the real-time image and the radiation receiving area on the real object of the detector is determined, and an automatic sensing exposure area corresponding to the automatic exposure control area is determined based on the mapping relationship, which effectively ensures that the automatic exposure control area delineated in the real-time image can correspond to the automatic sensing exposure area on the detector, thereby ensuring that the automatic sensing exposure area can match the object to be detected. The effectiveness and credibility of determining the exposure stop timing based on the automatic sensing exposure area are ensured.

[0129] like Fig.11 As shown, for the above step S8, in this embodiment, determining the exposure stop timing by the automatic sensing exposure area during exposure includes:

[0130] S801: Determine the brightness indication threshold of the automatic exposure control area according to the inspection requirement of the object to be inspected;

[0131] S802: Acquire the real-time brightness and darkness value of the automatic sensing exposure area during exposure;

[0132] S803: Compare the real-time brightness value with the brightness indication threshold, and stop exposure when the real-time brightness value reaches the brightness indication threshold.

[0133] In this embodiment, the brightness indication value and the brightness value may be the pixel average value and the sum of pixel values ​​(such as the grayscale average value or the grayscale sum value) of the corresponding area in the digital image formed by the detector based on the received X-rays, or may be the brightness of the corresponding scintillator on the detector after receiving the X-rays. Listed here are only the types that can be selected for the brightness indication value and the brightness value, and there is no limitation on their specific types. Those skilled in the art may set them as needed, and no further details will be given here.

[0134] In this embodiment, the stop exposure may be sending a stop exposure signal to the X-ray source, and the X-ray source immediately cuts off the X-ray beam after receiving the signal, or sending a stop receiving X-ray signal to the detector. Those skilled in the art may determine the way to stop exposure according to actual conditions or habits, and will not be described in detail here.

[0135] The above method for determining the exposure stop timing in this embodiment can be applied to objects to be inspected of different types or for different purposes, can meet the requirements of automatic exposure control areas of different sizes, and is more in line with the reading habits of different doctors, etc. It can effectively improve the usability of the formed radiographic images. Embodiment 2

[0136] This embodiment provides a radiographic imaging system, which is used to implement the above embodiments and preferred implementations, and the descriptions that have been made will not be repeated. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and conceivable. The following is a brief introduction to the components and corresponding functions of the radiographic imaging system.

[0137] like Fig.12 As shown, this embodiment also provides a radiographic imaging system, including:

[0138] The image collector 901 is used to obtain a real-time image of the object to be detected in front of the detector;

[0139] An image recognition processor 902 is used to recognize the real-time image, determine the area corresponding to the detector to obtain an image detector area, and determine the area corresponding to the object to be detected to obtain an image object area;

[0140] A correspondence processor 903, configured to determine a first positional relationship between the object to be detected and the detector according to the image object area and the image detector area;

[0141] The exposure control processor 904 is used to determine the displacement that the object to be detected needs to move based on the first position relationship, and send an exposure signal when the displacement that the object to be detected needs to move is less than a threshold.

[0142] The radiographic imaging system provided in this embodiment can determine the first positional relationship between the object to be detected and the detector through the real-time image, and based on the first positional relationship, can determine whether the position between the object to be detected and the detector is appropriate before exposure begins, and whether the object to be detected needs to be moved. The displacement that the object to be detected needs to be moved is determined by relying on the real-time image, without the need for technicians to use experience to determine whether the object to be detected is highly corresponding to the detector or ionization chamber. The imaging quality and efficiency are ensured, and repeated exposure is avoided.

[0143] By combining the solution of the present invention with a voice system, it is also possible to remotely command the movement of the object to be detected without having to go around the object to be detected to assist its movement, thereby effectively improving the positioning efficiency and imaging speed.

[0144] like Fig.12 As shown, the radiographic imaging system provided in this embodiment further includes:

[0145] A display 905, used to display the real-time image, and to display the image object area and the image detector area in the real-time image;

[0146] An input device 906, for selecting an automatic exposure control area in the image object area;

[0147] The exposure control processor 904 is further used to determine the automatic sensing exposure area on the detector corresponding to the automatic exposure control area according to the correspondence between the detector and the image detector area, and to determine the exposure stop timing through the automatic sensing exposure area during exposure.

[0148] like Fig.12As shown, in this embodiment, the image acquisition device 901 is electrically connected to the image recognition processor 902, the image recognition processor 902 is electrically connected to the correspondence processor 903, and the correspondence processor 903 is electrically connected to the exposure trigger processor 904; the correspondence processor 903, the display 905 and the input device 906 are electrically connected to the exposure control processor 904 respectively.

[0149] In this embodiment, the correspondence processor is electrically connected to the detector; the detector and the X-ray source are electrically connected to the exposure control processor respectively.

[0150] The system provided by the present invention realizes that the overlapping area between the detector and the object to be detected is determined through the real-time image, and based on the overlapping area, the automatic sensing exposure area is freely selected in the detector, thereby realizing automatic exposure control.

[0151] When the position of the detector is already determined, the automatic exposure control area can be set at any area of ​​the detector's radiation sensing area at any time, so that the operation process of automatic exposure control can be changed from adjusting the object to be detected according to the position of the ionization chamber so that the object to be detected matches the position of the ionization chamber to selecting the automatic exposure control area according to the position of the object to be detected. This effectively ensures the imaging quality and the convenience of operation.

[0152] The present invention also relates to a storage medium on which computer program code is stored. When the program code is executed, various embodiments of the method of the present invention can be implemented. The storage medium can be a tangible storage medium, such as a CD, a USB flash drive, a floppy disk, a hard disk, etc.

[0153] It should be understood by those skilled in the art that the exemplary components, systems and methods described in conjunction with the embodiments disclosed herein can be implemented in hardware, software or a combination of the two. Whether it is performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present invention are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium or transmitted on a transmission medium or a communication link via a data signal carried in a carrier. "Machine-readable medium" can include any medium that can store or transmit information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, and the like. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0154] It should also be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or in a different order from the embodiments, or several steps can be performed simultaneously.

[0155] In the present invention, features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, and / or combined with features of other embodiments or replace features of other embodiments.

[0156] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A radiographic imaging method, characterized in that: The method comprises the following steps: Acquire a real-time image of the object to be detected in front of the detector; Identify the real-time image, determine the area corresponding to the detector to obtain an image detector area, and determine the area corresponding to the object to be detected to obtain an image object area; Determine a first positional relationship between the object to be detected and the detector according to the image object area and the image detector area; Determining the displacement that the object to be detected needs to move based on the first position relationship; When the displacement required to be moved by the object to be detected is less than a threshold value, an automatic exposure control area is defined in the image object area according to the inspection requirements of the object to be detected; the inspection requirements of the object to be detected include the size and shape of the object to be detected; According to the correspondence between the detector and the image detector area, determining the automatic sensing exposure area in the detector corresponding to the automatic exposure control area; wherein the automatic sensing exposure area is a part of the radiation receiving area of ​​the detector, and the shape and size of the automatic sensing exposure area correspond to the automatic exposure control area; During exposure, the exposure stop timing is determined by the automatic sensing exposure area.

2. The method according to claim 1, characterized in that The identifying the real-time image and determining the area corresponding to the detector to obtain the image detector area includes: A feature identifier of the detector in the real-time image is identified, and a region corresponding to the detector in the real-time image is determined based on the feature identifier to obtain the image detector region.

3. The method according to claim 2, characterized in that The characteristic identification includes an image of an extension arm disposed on the detector and extending in a direction away from the detector in the real-time image; The step of determining the area corresponding to the detector in the real-time image based on the feature identifier to obtain the image detector area includes: Determining the image detector area according to a preset relative position relationship between the extension arm and the detector, and a position of the feature marker in the real-time image; or, The image detector area is determined according to a preset relative position relationship and a preset size ratio relationship between the extension arm and the detector, and a position of the feature marker in the real-time image and a corresponding area.

4. The method according to claim 2, characterized in that: Determining the first positional relationship between the object to be detected and the detector based on the image object area and the image detector area specifically includes: determining the overlapping relationship between the object to be detected and the detector based on the overlapping area between the image object area and the image detector area.

5. The method according to any one of claims 1 to 4, characterized in that The determining, based on the first position relationship, the displacement that the object to be detected needs to move includes: Determining the correspondence between the pixel length in the real-time image and the physical length of the detector according to the size of the image detector area and the preset detector size; The direction and distance that the object to be detected needs to move are determined according to the distance between the center of the image object area and the center of the image detector area, and the corresponding relationship between the pixel length in the real-time image and the physical length of the detector.

6. The method according to any one of claims 1 to 4, characterized in that Determining the exposure stop timing by automatically sensing the exposure area during exposure specifically includes: Determining a brightness indication threshold of the automatic exposure control area according to the inspection requirements of the object to be inspected; Acquire the real-time brightness and darkness value of the automatic sensing exposure area during exposure; The real-time brightness value is compared with the brightness indication threshold, and when the real-time brightness value reaches the brightness indication threshold, the exposure is stopped.

7. A radiographic imaging system, characterized in that: include: An image collector is used to obtain a real-time image of the object to be detected in front of the detector; An image recognition processor is used to recognize the real-time image, determine the area corresponding to the detector to obtain an image detector area, and determine the area corresponding to the object to be detected to obtain an image object area; a correspondence processor, configured to determine a first positional relationship between the object to be detected and the detector according to the image object area and the image detector area; A display, configured to display the real-time image, and to display the image object area and the image detector area in the real-time image; An input device for defining an automatic exposure control area in the image object area; An exposure control processor is used to determine the displacement that the object to be detected needs to move based on the first position relationship, and to determine the automatic sensing exposure area on the detector corresponding to the automatic exposure control area according to the corresponding relationship between the detector and the image detector area; wherein the automatic sensing exposure area is part of the detector's radiation receiving area, and the shape and size of the automatic sensing exposure area correspond to the automatic exposure control area.

8. A computer storage medium, characterized in that A computer program is stored thereon, and when the computer program is executed by a processor, the method steps according to any one of claims 1 to 6 are implemented.

Images