Digital X-ray image stitching method and device

Abstract

The present invention provides a digital X-ray image stitching method and device, the method comprising: determining the moving position of the detector and the number of moving positions according to the coverage range of the detected object; based on the moving position, using a tube to irradiate the detected object at the center of the initial tube to obtain the irradiated image at the moving position, wherein the tube is connected to a swingable column, and when the tube is irradiating, the column moves the tube to the center of the initial tube; stitching the irradiated images to obtain a target image. The method moves the tube by the column, so that the X-ray center of the tube is always kept in the same position, thereby achieving the purpose of single-viewpoint imaging.

Description

Technical Field

[0001] The invention belongs to the technical field of medical image processing, and in particular relates to a digital X-ray image stitching method and device. Background Art

[0002] With the continuous development of medical technology and medical diagnostic methods, digital X-ray images have been widely used in clinical diagnosis and medical research, especially in orthopedic diagnosis and treatment, which has very important clinical application value. In some clinical diagnosis and surgical treatment, the patient's whole body image is needed to conduct a comprehensive and intuitive observation and analysis of the lesion and its surroundings. Currently, due to the size of the detector, the digital X-ray photography system commonly used in orthopedic clinics can only provide images of part of the patient's body. Clinical diagnosticians need to analyze a series of images of the patient before they can construct a digital X-ray image of the patient's whole body in their minds. This not only increases the burden on clinical diagnosticians, but also the whole body digital X-ray images constructed in the mind are inevitably biased, which will have a certain impact on the diagnosis results. Therefore, it is very necessary to splice a series of digital X-ray images of the patient into a complete image.

[0003] At present, there are many methods for whole-body X-ray imaging. One is to rotate the tube to achieve angle imaging, that is, the height and position of the tube itself do not change, and the X-rays can be projected onto the detector plane at different positions by rotating the tube. Single-view imaging has no parallax and is easy to splice. Another method is panning shooting, but panning shooting belongs to multi-view imaging, which will produce parallax and is not conducive to image splicing. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in view of the problems of the prior art, the present invention provides a digital X-ray image stitching method, which effectively solves the problem that a device with a fixed tube cannot perform single-viewpoint image stitching.

[0005] In order to solve the above technical problems, the first aspect of the present invention provides a digital X-ray image stitching method, the method comprising:

[0006] Determine the moving position and the number of moving positions of the detector according to the coverage of the detected object;

[0007] Based on the moving position, the tube is used to illuminate the object to be inspected at the center of the initial tube to obtain an illuminated image at the moving position, wherein the tube is connected to a swingable column, and when the tube is irradiating, the column moves the tube to the center of the initial tube;

[0008] The irradiated images are stitched together to obtain a target image.

[0009] Further, when there are two moving positions, based on the moving positions, using the tube to illuminate the object to be detected at the center of the initial tube to obtain the illuminated image at the moving position includes:

[0010] When the detector is at the first moving position, the detector irradiates the detected object at the center of the initial tube through the tube to obtain an irradiated image at the first moving position;

[0011] When the detector moves to the second moving position, the tube is moved to the center of the initial tube by the column to illuminate the detected object, so as to obtain an illuminated image at the second moving position.

[0012] Further, moving the tube to the center of the initial tube through a column to illuminate the object to be detected includes:

[0013] The column swings toward the center of the initial ball tube, and the ball tube is moved to the position of the center of the initial ball tube based on the telescopic extension of the column.

[0014] Furthermore, the upright column swings toward the center of the initial ball tube and includes:

[0015] Calculating the angle at which the column needs to swing;

[0016] The upright post swings toward the center of the initial ball tube according to the swing angle.

[0017] Further, moving the ball tube to the position of the center of the initial ball tube based on the extension and retraction of the column includes:

[0018] Calculate the distance from the connection point between the detector and the column to the center of the initial tube;

[0019] The column moves the ball tube to the center of the initial ball tube according to the distance.

[0020] Furthermore, the irradiated images are stitched together to obtain a target image, including:

[0021] The maximum overlap range between the spliced ​​illumination images is less than 8 cm.

[0022] Furthermore, the number of the moving positions of the detector is the same as the number of the irradiated images.

[0023] In a second aspect, the present invention provides a digital X-ray image stitching device, comprising the detector, the column, the tube and a control system, wherein the detector is rotatably connected to the column, the column is fixedly connected to the tube, the tube is connected to the detector via the column, and the detector, the column, the tube and the control system are electrically connected.

[0024] The present invention provides a digital X-ray image stitching method, the method comprising: determining the moving position of the detector and the number of moving positions according to the coverage range of the detected object; based on the moving position, using a tube to irradiate the detected object at the center of the initial tube to obtain the irradiated image at the moving position, wherein the tube is connected to a swingable column, and when the tube is irradiating, the column moves the tube to the center of the initial tube; stitching the irradiated images to obtain a target image. The method moves the tube by the column, so that the X-ray center of the tube is always kept in the same position, thereby achieving the purpose of single-viewpoint imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The specific structure of the present invention is described in detail below with reference to the accompanying drawings

[0026] Figure 1 It is a schematic diagram of the flow of the digital X-ray image stitching method of the present invention;

[0027] Figure 2 It is a schematic diagram of a sub-process of the digital X-ray image stitching method of the present invention;

[0028] Figure 3 It is another sub-process diagram of the digital X-ray image stitching method of the present invention;

[0029] Figure 4 It is another sub-flow diagram of the digital X-ray image stitching method of the present invention. DETAILED DESCRIPTION

[0030] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0031] See also Figure 1 , Figure 1 This is a schematic diagram of the process of digital X-ray image stitching in an embodiment of the present application. The method includes:

[0032] Step 101: Determine the moving position and the number of moving positions of the detector according to the coverage range of the detected object.

[0033] In this embodiment, the moving position of the detector refers to the position of the detector after each movement. The moving position of the detector and the number of moving positions are determined according to the required irradiation range of the object to be detected and the size of the detector. The detector is actually an X-ray receiving module (imaging).

[0034] Step 102: Based on the moving position, the tube is used to illuminate the object to be inspected at the center of the initial tube to obtain an illumination image at the moving position, wherein the tube is connected to a swingable column, and when the tube is irradiating, the column moves the tube to the center of the initial tube.

[0035] In this embodiment, each time the detector moves, the column will move the tube to the center of the initial tube to irradiate the object to be detected, and obtain the irradiation image of the detector at the moved position. The column will keep the tube in the same position each time to achieve the purpose of single-viewpoint imaging. The column is a telescopic structure connecting the detector and the tube. The detector is always in the irradiation area of ​​the tube. The tube is an X-ray emitting unit, the center of the tube is the X-ray emission center, and the tube emits astigmatism.

[0036] Step 103: stitch the irradiated images to obtain a target image.

[0037] In this embodiment, the illumination images are captured according to the number of moving positions. When the detected object cannot be fully displayed in one illumination image, multiple illumination images need to be captured, so it is necessary to splice the multiple illumination images to form an image with a complete coverage range.

[0038] The embodiment of the present application provides a digital X-ray image stitching method, the method comprising: determining the moving position of the detector and the number of moving positions according to the coverage range of the detected object; based on the moving position, using a tube to irradiate the detected object at the center of the initial tube to obtain the irradiated image at the moving position, wherein the tube is connected to a swingable column, and when the tube is irradiating, the column moves the tube to the center of the initial tube; stitching the irradiated images to obtain a target image. The method moves the tube by the column so that the X-ray center of the tube always remains in the same position, thereby achieving the purpose of single-viewpoint imaging.

[0039] For details, please refer to Figure 2 , Figure 2 The sub-flow diagram of the digital X-ray image stitching method in the embodiment of the present application is as follows: when the number of the moving positions is two, based on the moving positions, using the tube to irradiate the object to be detected at the center of the initial tube, and obtaining the irradiated image at the moving position includes:

[0040] Step 201, when the detector is at a first moving position, the detector irradiates the detected object at the center of the initial tube through the tube to obtain an irradiated image at the first moving position;

[0041] Step 202: When the detector moves to the second moving position, the tube is moved to the center of the initial tube by a column to illuminate the detected object, so as to obtain an illuminated image at the second moving position.

[0042] In this embodiment, the moving distance of the detector can be multiple, but in this embodiment, only two are taken as an example, but it is not limited to two. When the detector is in the first position, the tube irradiates a part of the object to be detected at the center of the initial tube to obtain the irradiated object of the object to be detected at the first position. After the image irradiation at the first position is completed, the detector needs to move to the second position to irradiate the object to be detected again through the tube. After the detector moves to the second position, the tube is moved again to the center of the initial tube through the column to irradiate the object to be detected to obtain the irradiated image at the second position. After the irradiation images at the two positions are completed, they are spliced ​​to obtain a complete detection image.

[0043] Specifically, in this embodiment, moving the tube to the center of the initial tube through a column to illuminate the object to be detected includes:

[0044] The column swings toward the center of the initial ball tube, and the ball tube is moved to the position of the center of the initial ball tube based on the telescopic extension of the column.

[0045] In this embodiment, the column uses geometric relationships such as translation, swinging, and telescoping to keep the irradiation position of the tube at the center of the initial tube. The detector moves to the position where it needs to be moved, driving the column to move to the moving position of the detector. The column also needs to move close to the position of the initial center of the tube through the swinging arm, and then move the tube to the center of the initial tube through telescoping. The translation process, swinging process, and telescoping process of the column are carried out simultaneously, which can increase the speed of the irradiation process.

[0046] Please refer to Figure 3 , Figure 3 This is another sub-process diagram of the digital X-ray image stitching method in the embodiment of the present application. In this embodiment, the column swings toward the center of the initial tube, including:

[0047] Calculating the angle at which the column needs to swing;

[0048] The upright post swings toward the center of the initial ball tube according to the swing angle.

[0049] In this embodiment, the column swings toward the center of the initial tube through a swing arm. It is necessary to calculate the angle of the column swing arm and then swing according to the swing arm angle. For example, when the straight-line distance from the center of the initial tube to the detector is 150CM, the width of the detector is 43CM, and the detector offset distance is 35CM, if the detector moves to the right, the column needs to swing to the left, and the swing angle should be 13.1340°.

[0050] Please refer to Figure 4 , Figure 4 This is another sub-process diagram of the digital X-ray image stitching method in an embodiment of the present application. Specifically, moving the tube to the position of the initial tube center based on the extension of the column includes:

[0051] Calculate the distance from the connection point between the detector and the column to the center of the initial tube;

[0052] The column moves the ball tube to the center of the initial ball tube according to the distance.

[0053] In this embodiment, when the column moves the tube to the center of the initial tube, it is also necessary to calculate the distance between the connection point between the column and the detector and the center of the initial tube. According to this distance, the column moves the tube to the center of the initial tube by telescoping. For example, when the straight-line distance from the center of the initial tube to the detector is 150CM, the width of the detector is 43CM, and the offset distance of the detector is 35CM, it can be calculated that the straight-line distance from the connection point between the column and the detector to the center of the initial tube is 154.0292CM. The column can be further telescoped to 154.0292CM according to its own length to move the tube to the center of the initial tube.

[0054] In this embodiment, the distance that the column needs to be swung and the length that the column needs to be extended and retracted do not need to be calculated manually, but are directly obtained in the calculation model, and the column is swung or retracted directly according to the calculation result.

[0055] Specifically, stitching the irradiated images to obtain a target image includes:

[0056] The maximum overlap range between the spliced ​​illumination images is less than 8 cm.

[0057] In this embodiment, the overlap range of the stitched irradiation images is preferably 2-8CM, wherein the stitched images may not overlap, but there must be continuity between the two, and the overlap range cannot be greater than 8CM, otherwise it is equivalent to repeated exposure.

[0058] Specifically, the number of the moving positions of the detector is the same as the number of the irradiated images.

[0059] In this embodiment, the detector only illuminates one image when it moves once, which effectively protects the tube. Too many exposure times would cause great damage to the tube.

[0060] Specifically, an embodiment of the present application provides a digital X-ray image stitching device, including the detector, the column, the tube and a control system, the detector is rotatably connected to the column, the column is fixedly connected to the tube, the tube is connected to the detector via the column, and the detector, the column, the tube and the control system are electrically connected.

[0061] In this embodiment, the tube is fixedly connected to the column, so that the X-ray center of the tube can always remain in the same position, thereby achieving single-viewpoint imaging. The column is rotatably connected to the detector, and the column can move the tube to the initial center of the tube for irradiation by translation, swinging and telescoping. The detector, column, tube and control system are electrically connected. The control system can calculate the swing angle and telescopic distance of the column, and can also control the movement of the detector and the telescoping and swinging of the column.

[0062] The digital X-ray image stitching device provided in the embodiment of the present application can achieve: determining the moving position of the detector and the number of moving positions according to the coverage range of the detected object; based on the moving position, using the tube to irradiate the detected object at the center of the initial tube to obtain the irradiated image at the moving position, wherein the tube is connected to a swingable column, and when the tube is irradiating, the column moves the tube to the center of the initial tube; stitching the irradiated images to obtain the target image. The method moves the tube by the column so that the X-ray center of the tube always remains in the same position, thereby achieving the purpose of single-viewpoint imaging.

[0063] It should be noted that the various embodiments in the present invention are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0064] It should also be noted that, in the context of the present invention, relational terms such as first and second, etc., are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0065] The above description of the disclosed embodiments enables professionals and technicians in the field to implement or use the present invention. Various modifications to these embodiments will be apparent to professionals and technicians in the field, and the general principles defined in the present invention can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown in the present invention, but will conform to the widest range consistent with the principles and novel features disclosed in the present invention.

Claims

1. A digital X-ray image stitching method, applied to a digital X-ray image stitching device, characterized in that: The digital X-ray image stitching device comprises a detector, a column, a tube and a control system, wherein the detector is rotatably connected to the column, the column is fixedly connected to the tube, the tube is connected to the detector via the column, and the detector, the column, the tube and the control system are electrically connected; The method comprises: Determine the moving position and the number of moving positions of the detector according to the coverage of the detected object; Based on the moving position, the tube is used to illuminate the object to be inspected at the center of the initial tube to obtain an illuminated image at the moving position, wherein the tube is connected to a swingable column, and when the tube is irradiating, the column moves the tube to the center of the initial tube; splicing the irradiated images to obtain a target image; The step of irradiating the detected object at the center of the initial tube using the tube based on the moving position specifically includes: The detector moves to the moving position, driving the column to move to the moving position, and the column synchronously drives the tube to move. The column makes the tube close to the position of the initial center of the tube through the swing arm, and then moves the tube to the initial center of the tube through telescoping, so as to use the tube to illuminate the object to be detected at the initial center of the tube.

2. The method according to claim 1, characterized in that When there are two moving positions, based on the moving positions, using the tube to illuminate the object to be detected at the center of the initial tube, and obtaining the illuminated image at the moving position includes: When the detector is at the first moving position, the detector irradiates the detected object at the center of the initial tube through the tube to obtain an irradiated image at the first moving position; When the detector moves to the second moving position, the tube is moved to the center of the initial tube by the column to illuminate the detected object, so as to obtain an illuminated image at the second moving position.

3. The method according to claim 1, characterized in that The upright column swings toward the center of the initial ball tube and includes: Calculating the angle at which the column needs to swing; The upright post swings toward the center of the initial ball tube according to the swinging angle.

4. The method according to claim 1, characterized in that Moving the ball tube to the position of the initial ball tube center based on the extension and retraction of the column includes: Calculate the distance from the connection point between the detector and the column to the center of the initial tube; The column moves the ball tube to the center of the initial ball tube according to the distance.

5. The method according to claim 1, characterized in that The step of stitching the irradiated images to obtain a target image comprises: The maximum overlap range between the spliced ​​illumination images is less than 8 cm.

6. The method according to claim 1, characterized in that The number of movement positions of the detector is the same as the number of the illumination images.

Images