X-ray imaging positioning method, storage medium and computer program product

Abstract

The invention discloses an X-ray imaging positioning method, a storage medium and a computer program product. The X-ray imaging positioning device comprises a processor and a memory. The method comprises the following steps of: fixing a camera on CT scanning equipment, and adjusting an angle and a focal length to enable a to-be-scanned target and an auxiliary positioning identifier to enter a visual field; the debugging equipment enables the cone beam line rotating shaft direction to be the left-right direction of the target head, thereby adjusting the angle of the camera to be vertical. Turning on a camera and a connected screen to collect images and present positioning, confirming that the target is in the visual field according to voice prompt, converting and displaying a CT visual field preview frame, and adjusting the Z-axis direction to complete positioning. The universal patient positioning method provided by the invention can solve the problem that CBCT (Cone Beam Computed Tomography) is limited in positioning guidance in a closed scene, and meanwhile, the positioning information is digitized, so that the positioning operation can be metrics, and the method is suitable for small-view CBCT imaging.

Description

Technical Field

[0001] The present invention relates to the field of medical imaging, and in particular to an X-ray imaging positioning method, a storage medium and a computer program product. Background Art

[0002] In the field of modern medical diagnosis and treatment, patient positioning is a crucial operational link, and its accuracy directly affects the quality of subsequent medical equipment's detection and imaging of patient body parts and the accuracy of related treatments.

[0003] For a long time, when positioning patients in an open field environment, medical staff can adjust the patient's posture more conveniently and accurately position the corresponding medical equipment by visual observation. For example, in routine ordinary X-ray examinations or some simple diagnosis and treatment operation scenarios around open beds, medical staff can clearly see the patient's overall posture and the position of the equipment relative to the patient's body from multiple angles. Through direct visual judgment, they can easily guide the patient to adjust the lying, sitting and other postures, and accurately place detection probes, imaging equipment, etc. in the required positions, thereby ensuring the smooth development of diagnosis and treatment. This method has been widely used and effective in open field conditions.

[0004] However, with the continuous development of medical technology, more and more special medical equipment has been put into use. These equipment often have specific usage requirements and unique structural designs, which requires the patient positioning work to be carried out in a relatively closed environment. Take the face-down oral CBCT (cone beam CT) device as an example. When performing high-precision imaging scans on the patient's oral area, the patient needs to lie face down on a specific examination table with his head fixed in the corresponding position. At this time, it is difficult for medical staff to fully observe the patient's head and the exact relative position relationship between the inside of the oral cavity and the equipment from the front or side. Since the equipment structure itself blocks the line of sight, the visual angle of visual positioning is extremely limited, and it is difficult to accurately judge whether the patient is in the best scanning posture. Key factors such as the slight tilt angle of the head and the degree of fit between the face and the equipment detection area cannot be effectively controlled by traditional visual methods. This is very likely to cause deviations in the final collected oral images, affecting the subsequent accurate diagnosis of oral diseases.

[0005] Similarly, in the application scenario of breast CBCT equipment for prone posture detection, the patient lies prone on the examination bed, and the breast is placed in the scanning area of ​​the equipment. In order to achieve precise focusing and imaging, the overall structure of the equipment surrounds the breast area. From the perspective of external medical staff, most of the line of sight is blocked by the equipment. The traditional method of patient posture positioning and equipment positioning based on visual observation cannot meet the needs at all. It is difficult to determine whether the breast is in the best scanning center position, and whether the overall balance and stable posture of the patient's body meet the requirements of the equipment. This will not only reduce the clarity and accuracy of the imaging, but may even require repeated positioning and scanning operations, increasing the patient's discomfort and the time cost of diagnosis and treatment.

[0006] In summary, given the obvious drawbacks of traditional patient positioning methods in closed environments due to limited angles and equipment obstruction, there is an urgent need for an innovative patient positioning technology to solve the above-mentioned precise positioning problems faced in specific medical equipment usage scenarios, thereby improving the efficiency and quality of medical testing and diagnosis. Summary of the invention

[0007] The object of the present invention is to provide an X-ray imaging positioning method, a storage medium and a computer program product to solve the problems raised in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions: The X-ray imaging positioning method includes: a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor performs the following process: Fix the camera on the corresponding CT scanning device; Adjust the angle and focal length parameters of the camera to ensure that the target to be scanned and the auxiliary positioning markers around the device are completely within the camera's field of view; Install and debug the CT scanning equipment so that the cone beam line rotation axis direction is the left and right direction of the target head to be scanned; According to the direction of the cone beam line rotation axis, the installation angle of the camera is adjusted so that the field of view of the camera is strictly perpendicular to the direction of the cone beam line rotation axis; Turn on the camera and the screen connected to it. The camera starts to collect image data of the patient's area in real time, showing the current position of the scan target. Confirm based on voice prompts that the scanning target is within the field of view of the CT scanning device; The field of view of the CT scanning device is converted and displayed on the screen, that is, the preview box of the CT field of view. According to the imaging position of the CT scanning device, the Z-axis direction is adjusted to complete the positioning.

[0009] As a further solution of the present invention: based on the actual size of the camera imaging and the size of the screen field of view, the mapping ratio A between the screen pixels and the actual size is calculated, and based on the mapping ratio A, the display size of the theoretical CT field of view on the screen is converted.

[0010] As a further solution of the present invention: the calculation method of the mapping ratio A is as follows: first prepare a standard object of known actual size, place it within the field of view of the camera, and be in the same relative position and plane as the subsequent scanning target, the camera collects the image of the standard object and displays it on the screen, and measures the side length pixel value P corresponding to the image of the standard object on the screen through image analysis software or the pixel measurement tool provided by the screen, according to the formula: , where A is the mapping ratio between screen pixels and actual size, P is the pixel value of the side length corresponding to the image on the screen, and L is the actual side length of the standard object. The mapping ratio A is calculated.

[0011] As a further solution of the present invention: the standard object is a square calibration plate with a known side length.

[0012] As a further solution of the present invention: the actual size parameters of the theoretical CT field of view of the CT scanning device are obtained, and according to the calculated mapping ratio A, the display sizes of the CT field of view in the X, Y, and Z directions on the screen are calculated respectively, and the CT field of view range is displayed on the screen in the form of a corresponding frame according to the calculated sizes.

[0013] As a further solution of the present invention: the actual sizes of the CT field of view in the X, Y, and Z directions are , , , the display size of the CT field of view in the X, Y, and Z directions on the screen is , , ,in , , .

[0014] As a further solution of the present invention: when fixing the position of the radiation source in the Z-axis direction, confirm that the position of the radiation source in the Z-axis direction is fixed, and adjust the position in the Z-axis direction according to the CT field of view displayed on the screen and the current posture image of the target to be scanned.

[0015] As a further solution of the present invention: the structure for operating and controlling the movement of the Z-axis platform where the target to be scanned is located slowly moves the Z-axis platform where the target to be scanned is located until the CT field of view accurately covers the part of the target to be scanned that needs to be detected. At this time, the target to be scanned is in a suitable scanning position in the Z-axis direction.

[0016] As a further solution of the present invention: when fixing the Z-axis platform position of the target to be scanned, ensure that the Z-axis platform position of the target to be scanned is fixed, and input a command in the software system through the operation interface equipped with the device to adjust the offset of the preview box of the CT field of view in the Z-axis direction. .

[0017] As a further solution of the present invention: the method for adjusting the offset of the preview frame of the CT field of view in the Z-axis direction is: the pixel offset of the preview frame in the Z-axis direction is According to the mapping ratio A, it is converted into the physical offset of the source in the Z-axis direction , based on the calculated physical offset of the source in the Z-axis direction The mechanical transmission device inside the equipment drives the radiation source to move a corresponding distance in the Z-axis direction to complete the adjustment of the radiation source position, that is, to complete the preview positioning of the CT field of view.

[0018] A readable storage medium stores a computer program, and when the computer program is executed by a processor, it is used to implement the method described in any of the above embodiments.

[0019] A computer program product comprises a computer program, wherein the computer program, when executed by a processor, is used to implement at least the method described in any one of the above embodiments.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The digitization of positioning information means that each positioning operation has a clear quantitative standard and no longer relies on the simple experience of medical staff. For example, in the process of calculating the mapping ratio A between screen pixels and actual size, an objective and accurate data is obtained through the measurement of standard objects and a fixed calculation formula. This data becomes an important basis for the subsequent CT field of view on the screen display size conversion and position adjustment.

[0021] This makes the positioning operation standardized, avoiding the problem of inconsistent positioning due to individual differences among medical staff. At the same time, this digitized positioning operation is also repeatable. The next time the same type of scan is performed, the positioning can be completed quickly and accurately by referring to the previously recorded data, ensuring the stability of the quality of each positioning and helping to establish a standardized medical operation process system.

[0022] Small-field CBCT imaging is mainly used for detailed observation of a specific small area of ​​the human body, such as the fine structure of teeth and micro-lesions in the breast, and has extremely high requirements for positioning accuracy. Traditional positioning methods are difficult to meet the high-precision requirements of small-field CBCT imaging due to the lack of accurate data support and precise positioning methods.

[0023] Solving the problems of CBCT's limited positioning in closed scenes, digitizing positioning information, and being suitable for small-field-of-view CBCT imaging has brought about significant beneficial effects in many aspects, both in terms of improving the quality of medical testing and improving patient experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The flowchart of the positioning process of the X-ray imaging positioning method is shown in FIG.

[0025] Figure 2 Schematic diagram of the relationship between the field of view direction and the cone beam line rotation axis direction for camera placement in the X-ray imaging positioning method.

[0026] Figure 3 A schematic diagram of the CT field of view conversion displayed on the screen for the X-ray imaging positioning method. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and implementations. It is to be understood that the specific implementations described herein are only used to explain the relevant content, rather than to limit the present invention. It is also necessary to explain that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings.

[0028] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] Unless otherwise specified, the exemplary embodiments / embodiments shown will be understood as exemplary features that provide various details of some ways in which the technical concept of the present invention can be implemented in practice. Therefore, unless otherwise specified, the features of the various embodiments / embodiments can be combined, separated, interchanged and / or rearranged without departing from the technical concept of the present invention.

[0030] The terms used herein are for the purpose of describing specific embodiments, rather than being restrictive. As used herein, unless the context clearly indicates otherwise, the singular forms "one (kind, person)" and "said (the)" are also intended to include plural forms. In addition, when the terms "comprise" and / or "include" and their variations are used in this specification, it is explained that there are stated features, integral bodies, steps, operations, parts, assemblies and / or their groups, but it is not excluded that there are or add one or more other features, integral bodies, steps, operations, parts, assemblies and / or their groups. It should also be noted that the terms "substantially", "approximately" and other similar terms as used herein are used as approximate terms and not as degree terms, so that they are used to explain the inherent deviations of the measured values, calculated values ​​and / or provided values ​​that will be recognized by those of ordinary skill in the art.

[0031] When performing CBCT (cone beam CT) shooting, artifacts may exist in the captured CBCT images. For example, when performing oral CBCT shooting, if there are metal objects such as metal teeth inside the mouth, metal artifacts will exist in the obtained oral CBCT images. For CBCT images with artifacts, artifact correction can be performed based on iterative reconstruction technology, but this method requires that the scanned object is completely within the field of view, and the iterative reconstruction technology requires multiple reconstructions, which makes the amount of calculation very large, resulting in low efficiency of artifact correction. Artifact correction can also be performed by pre-training the neural network and directly inputting the CBCT image into the neural network, but the risk of the image generated in this way is uncontrollable. The newly generated image content may be unable to distinguish whether it is a real artifact, making the original non-artifact area blurred. While correcting the original artifact, new unclear areas will be generated, forming new image defects.

[0032] Figure 1-3 The detailed description is for a clearer understanding of the technical solution of the present invention and should not be considered as a limitation of the protection scope of the present invention. In the process of implementing the technical idea of ​​the present invention, one or some steps may be omitted, or other alternatives may be adopted.

[0033] The X-ray imaging positioning method comprises the following steps: S001: Fix the camera on the corresponding CT scanning device; S002: Adjust the angle and focal length parameters of the camera so that the target to be scanned and the auxiliary positioning marks around the device are completely included in the camera's field of view; Choose a suitable position to fix the camera on the corresponding CT scanning equipment (such as oral CBCT equipment or breast CBCT equipment) to ensure that the camera will not become loose or shifted during the operation of the equipment to ensure its stability.

[0034] By adjusting the camera's angle, focal length and other parameters, the objects to be scanned (such as the dental area in the patient's mouth, breast tissue, etc.) and related auxiliary positioning markers around the equipment are all fully included in the camera's field of view.

[0035] The overall structure of the device is similar to a platform with a head fixing device. A camera is installed at a suitable position above the platform, with its lens facing the patient's head placement area. When the patient lies on the device to prepare for an oral scan, the camera's field of view can cover the entire area from the patient's lips to the teeth at the back of the mouth, and can also see some scale marks, bite blocks and other parts on the device that are used to assist in positioning. In this way, medical staff can clearly know the relative position of various parts of the patient's mouth and the device through camera images, providing a reference for positioning.

[0036] S003: Install and debug the CT scanning equipment so that the cone beam line rotation axis direction is the left and right direction of the target head to be scanned; During the equipment installation and debugging phase, determine the exact direction of the cone beam line rotation axis. Generally, this direction is determined by the mechanical structure and scanning principle of the equipment. In oral CBCT equipment, the cone beam line rotation axis is usually along the left and right direction of the patient's head.

[0037] S004: According to the direction of the cone beam line rotation axis, adjust the installation angle of the camera so that the field of view of the camera is strictly perpendicular to the direction of the cone beam line rotation axis; According to the direction of the cone beam line rotation axis, adjust the camera installation angle so that the camera's field of view is strictly perpendicular to the cone beam line rotation axis. Professional angle measurement tools (such as protractors, etc.) can be used for calibration to ensure that the vertical accuracy meets the equipment requirements.

[0038] If the cone beam line rotation axis direction is determined to be horizontal to the left or right, then install the camera on the device so that its lens faces straight ahead (perpendicular to the left and right direction), that is, perpendicular to the cone beam line rotation axis direction. In this way, the image captured by the camera is exactly the positional relationship between the patient's oral cavity and its related parts of the device at this vertical perspective from the front. For example, it can clearly see whether the teeth are symmetrically placed on the horizontal plane and whether the relative position with the scanning rays is appropriate, etc., which helps to accurately judge the position accuracy of subsequent scanning imaging and avoid quality problems such as ghosting and missing of some areas due to angle deviation.

[0039] S005: Turn on the camera and the screen connected to it, and the camera starts to collect image data of the area where the patient is located in real time, and presents the current position of the scan target; The camera and the screen connected to it are turned on, and the camera begins to collect image data of the patient's area in real time.

[0040] The image data is transmitted to the screen through a data transmission line (such as a data cable, a wireless transmission module, etc.) and displayed in real time, presenting the patient's current posture.

[0041] S006: Confirm based on the voice prompt that the scanning target is within the field of view of the CT scanning device; Medical staff stand in front of the screen, carefully observe the real-time images on the screen, pay attention to the key parts of the patient's body (such as the tooth occlusion and head tilt during oral scanning; whether the breasts are symmetrically placed and the body is lying flat during breast scanning, etc.), and judge whether the standard posture requirements for CT scanning are met.

[0042] If it is found that the patient's posture does not meet the requirements, the medical staff will guide the patient to adjust his body posture through voice commands or direct hands-on assistance. For example, they will tell the patient to "tilt your head slightly to the left" or "move your body to the middle of the platform", etc., until the patient is observed to be in the best scanning posture on the screen.

[0043] In the breast CBCT equipment scenario, the patient lies prone on the examination bed with the breast placed in the scanning area. The camera displays the real-time image captured on the screen. The medical staff sees that one of the patient's breasts on the screen is slightly off the preset scanning center position of the device, and the body is also slightly tilted to one side. So the medical staff tells the patient, "Please move your body a little to the left so that the breast is as close to the center of the scanning area as possible." After the patient adjusts according to the instructions, the medical staff observes the screen again to confirm that the breast position and the patient's body posture have reached the ideal state and meet the requirements of the next CT scan. This ensures the accuracy of the scanning imaging and avoids increasing the patient's radiation exposure and time cost due to rescanning due to poor posture.

[0044] S007: The field of view of the CT scanning device is converted and displayed on the screen, that is, the preview frame of the CT field of view. According to the imaging position of the CT scanning device, the Z-axis direction is adjusted to complete the positioning.

[0045] According to the actual size of the camera imaging and the size of the screen field of view, the mapping ratio A between the screen pixels and the actual size is calculated. According to the mapping ratio A, the display size of the theoretical CT field of view on the screen is converted.

[0046] The calculation method of the mapping ratio A is as follows: first prepare a standard object of known actual size, place it within the camera's field of view, and in the same relative position and plane as the subsequent scanning target. The camera collects the image of the standard object and displays it on the screen. Use the image analysis software or the pixel measurement tool on the screen to measure the side length pixel value P corresponding to the image of the standard object on the screen, according to the formula: , where A is the mapping ratio between screen pixels and actual size, P is the pixel value of the side length corresponding to the image on the screen, and L is the actual side length of the standard object. The mapping ratio A is calculated.

[0047] The standard object is a square calibration plate with a known side length.

[0048] The actual size parameters of the theoretical CT field of view of the CT scanning device are obtained, and the display sizes of the CT field of view in the X, Y, and Z directions on the screen are calculated according to the calculated mapping ratio A, and the CT field of view range is displayed on the screen in the form of a corresponding frame according to the calculated size.

[0049] The actual sizes of the CT field of view in the X, Y, and Z directions are , , , the display size of the CT field of view in the X, Y, and Z directions on the screen is , , ,in , , .

[0050] For example, it is known that the actual size of the CT field of view of the oral CBCT device is 10 cm in the X direction and 8 cm in the Y direction. According to the previously calculated mapping ratio A=10 (pixels / cm), the following can be obtained by calculation: =10 10=100 (pixels), (pixels). Therefore, a transparent rectangular frame with a length of 100 pixels and a width of 80 pixels will be used on the screen to represent the CT field of view. When medical staff see this frame, they can clearly know how large an area in the patient's mouth the scanning device will image, which is convenient for subsequent position adjustment and judgment.

[0051] Confirm that the position of the source in the Z-axis direction is fixed, such as by using a mechanical locking device or setting parameters in the device control system to ensure that the source will not move accidentally in the Z-axis.

[0052] Medical staff can judge whether the patient needs to adjust his position in the Z-axis direction by observing the CT field of view preview frame (transparent frame) and the patient's current posture image displayed on the screen. If it is found that the CT field of view displayed in the preview frame does not accurately cover the target part to be scanned (such as the root of the tooth is not completely in the frame during oral scanning, and the key tissue part of the breast is not in the frame during breast scanning, etc.), the device that controls the movement of the Z-axis platform where the patient is located (such as an electric push rod, a hand-cranked adjustment rod, etc.) is manually operated.

[0053] Slowly move the Z-axis platform where the patient is located, and observe the relative position changes between the CT field of view and the patient's body parts in the preview box on the screen in real time during the movement, until the CT field of view accurately covers the target body part to be tested. At this time, the patient is in a suitable scanning position in the Z-axis direction.

[0054] When the oral CBCT device is scanning, the radiation source is fixed in the Z-axis direction. In the initial state, the medical staff see that the CT field of view preview frame on the screen only covers the upper half of the patient's teeth, and the root part is not included, which means that the patient's position in the Z-axis direction needs to be adjusted. The medical staff operates the electric push rod to slowly move the platform where the patient is located upward along the Z-axis direction, while staring at the preview frame on the screen. When the root part is completely in the preview frame, that is, the CT field of view accurately covers the entire tooth area, the platform is stopped from moving. In this way, the patient is adjusted to the appropriate scanning position in the Z-axis direction, which can ensure the integrity and accuracy of subsequent scanning imaging.

[0055] Ensure that the Z-axis platform where the patient is located is fixed by the corresponding fixing device (such as a lock, brake device, etc.) so that it will not move. Medical staff observe the relative position of the CT field of view preview frame displayed on the screen and the target scanning part. If it is found that the CT field of view is not accurately aligned with the part to be scanned (such as the position of the teeth is not in the center of the frame during oral scanning, and the key breast tissue deviates from the ideal position in the frame during breast scanning, etc.), then enter the corresponding command in the software system through the operation interface equipped with the equipment (such as touch screen, mouse operation software interface, etc.) to adjust the offset of the preview frame in the Z-axis direction ∆ .

[0056] The method for adjusting the offset of the preview frame of the CT field of view in the Z-axis direction is: , converted into the physical offset of the source in the Z-axis direction according to the mapping ratio A , based on the calculated physical offset of the source in the Z-axis direction The mechanical transmission device inside the equipment drives the radiation source to move a corresponding distance in the Z-axis direction to complete the adjustment of the radiation source position, that is, to complete the preview positioning of the CT field of view.

[0057] In the breast CBCT equipment scenario, the Z-axis platform where the patient is located has been fixed. The medical staff saw that the key breast tissue in the CT field preview frame on the screen was slightly lower and not in the ideal position in the frame. So they used the touch screen to input instructions in the software to shift the preview frame upward in the Z-axis direction by 20 pixels (i.e. = 20 pixels). Given the previously calculated mapping ratio (A = 10 pixels / cm), we can get the following conversion formula: Then the motor inside the device drives the screw mechanism to move the radiation source upward 2 cm in the Z-axis direction. The medical staff observed the screen and found that the CT field of view was accurately aligned with the key tissue of the breast, realizing the preview positioning of the CT field of view, ensuring that the subsequent scanning imaging can accurately obtain the required breast tissue images.

[0058] It should be noted that the details not disclosed in the image processing method M10 of this embodiment can refer to the details disclosed in the X-ray imaging positioning method of the above embodiment proposed by the present invention, and will not be repeated here.

[0059] The present invention also provides a readable storage medium, in which a computer program is stored, and when the computer program is executed by a processor, it is used to implement the method of any of the above embodiments. For the purpose of this specification, "readable storage medium" can be any device that can contain, store, communicate, propagate or transmit a program for use in an instruction execution system, device or equipment or in combination with these instruction execution systems, devices or equipment. More specific examples of readable storage media (non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and editable read-only memory (EPROM or flash memory), an optical fiber device, and a portable read-only memory (CDROM).

[0060] The present invention also provides a computer program product. The method of the present invention can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instruction is loaded and executed, the process or function of the present invention is executed in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, a core network device, an OAM or other programmable device.

[0061] The computer program or instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instructions may be transmitted from one website, computer, server or data center to another website, computer, server or data center by wired or wireless means. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it may also be an optical medium, such as a digital video disk; it may also be a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or non-volatile storage medium, or may include both volatile and non-volatile types of storage media.

[0062] It should be understood by those skilled in the art that the embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0063] The present invention is described with reference to the flowcharts and / or block diagrams of the methods and computer program products according to the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0064] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide for implementing the process in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0065] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "specific examples", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, without contradiction.

[0066] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0067] It should be understood by those skilled in the art that the above embodiments are only for the purpose of clearly illustrating the present invention, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present invention.

Claims

1. An X-ray imaging positioning method, characterized in that: include: A processor and a memory, wherein the memory stores a computer program. When the computer program is executed by the processor, the processor performs the following process: Fix the camera on the corresponding CT scanning device; Adjust the angle and focal length parameters of the camera to ensure that the target to be scanned and the auxiliary positioning markers around the device are completely within the camera's field of view; Install and debug the CT scanning equipment so that the cone beam line rotation axis direction is the left and right direction of the target head to be scanned; According to the direction of the cone beam line rotation axis, the installation angle of the camera is adjusted so that the field of view of the camera is strictly perpendicular to the direction of the cone beam line rotation axis; Turn on the camera and the screen connected to it. The camera starts to collect image data of the patient's area in real time, showing the current position of the scan target. Confirm based on voice prompts that the scanning target is within the field of view of the CT scanning device; The field of view of the CT scanning device is converted and displayed on the screen, that is, the preview box of the CT field of view. According to the imaging position of the CT scanning device, the Z-axis direction is adjusted to complete the positioning.

2. The X-ray imaging positioning method according to claim 1, characterized in that: According to the actual size of the camera imaging and the size of the screen field of view, the mapping ratio A between the screen pixels and the actual size is calculated. According to the mapping ratio A, the display size of the theoretical CT field of view on the screen is converted.

3. The X-ray imaging positioning method according to claim 2, characterized in that: The calculation method of the mapping ratio A is as follows: first prepare a standard object of known actual size, place it within the camera's field of view, and in the same relative position and plane as the subsequent scanning target. The camera collects the image of the standard object and displays it on the screen. Use the image analysis software or the pixel measurement tool on the screen to measure the side length pixel value P corresponding to the image of the standard object on the screen, according to the formula: , where A is the mapping ratio between screen pixels and actual size, P is the pixel value of the side length corresponding to the image on the screen, and L is the actual side length of the standard object. The mapping ratio A is calculated.

4. The X-ray imaging positioning method according to claim 3, characterized in that: The standard object is a square calibration plate with a known side length.

5. The X-ray imaging positioning method according to claim 2, characterized in that: The actual size parameters of the theoretical CT field of view of the CT scanning device are obtained, and the display sizes of the CT field of view in the X, Y, and Z directions on the screen are calculated according to the calculated mapping ratio A, and the CT field of view range is displayed on the screen in the form of a corresponding frame according to the calculated size.

6. The X-ray imaging positioning method according to claim 5, characterized in that: The actual sizes of the CT field of view in the X, Y, and Z directions are , , , the display size of the CT field of view in the X, Y, and Z directions on the screen is , , ,in , , .

7. The X-ray imaging positioning method according to claim 1, characterized in that: When fixing the position of the radiation source in the Z-axis direction, confirm that the position of the radiation source in the Z-axis direction is fixed, and adjust the position in the Z-axis direction according to the CT field of view displayed on the screen and the current posture image of the target to be scanned.

8. The X-ray imaging positioning method according to claim 7, characterized in that: The structure for operating and controlling the movement of the Z-axis platform where the target to be scanned is located slowly moves the Z-axis platform where the target to be scanned is located until the CT field of view accurately covers the part of the target to be scanned that needs to be detected. At this time, the target to be scanned is in a suitable scanning position in the Z-axis direction.

9. The X-ray imaging positioning method according to claim 1, characterized in that: When fixing the Z-axis platform position of the target to be scanned, ensure that the Z-axis platform position of the target to be scanned is fixed, and enter commands in the software system through the operation interface equipped with the equipment to adjust the offset of the preview box of the CT field of view in the Z-axis direction. .

10. The X-ray imaging positioning method according to claim 9, characterized in that: The method for adjusting the offset of the preview frame of the CT field of view in the Z-axis direction is as follows: , converted into the physical offset of the source in the Z-axis direction according to the mapping ratio A , based on the calculated physical offset of the source in the Z-axis direction The mechanical transmission device inside the equipment drives the radiation source to move a corresponding distance in the Z-axis direction to complete the adjustment of the radiation source position, that is, to complete the preview positioning of the CT field of view.

11. A readable storage medium, characterized in that: The readable storage medium stores a computer program, and when the computer program is executed by a processor, it is used to implement the method according to any one of claims 1 to 10.

12. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the computer program is used to implement at least the method according to any one of claims 1 to 10.

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