Quality control phantom structure and quality detection method

Abstract

The present disclosure provides a quality control phantom structure and a quality detection method. The quality control phantom structure comprises: a support comprising three rotation shafts corresponding to different rotation degrees of freedom, for realizing rotation in any angle and direction in three-dimensional space; a mechanical precision detection phantom for rotating to the central axis perpendicular to the beam of the quality control equipment of the non-coplanar digital radiographic image-guided system under the driving action of the three rotation shafts, and performing mechanical precision detection on the quality control equipment of the non-coplanar digital radiographic image-guided system based on the principle of a vernier caliper. An image quality detection phantom for rotating to the central axis perpendicular to the beam of the quality control equipment of the non-coplanar digital radiographic image-guided system under the driving action of the three rotation shafts, for performing image quality detection on the quality control equipment of the non-coplanar digital radiographic image-guided system. The quality control phantom structure and the quality detection method can clearly detect the error results of the detected equipment, and the reliability of the detection results is higher.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of quality detection of radiotherapy devices, and particularly relates to a quality control phantom structure and a quality detection method. BACKGROUND

[0002] Radiotherapy is a discipline of treating tumors using radiation. Before treatment, various image devices are used for image guidance to achieve image guide radiotherapy (IGRT) so as to more accurately irradiate the target area. The devices used in current IGRT include electronic portal imaging devices (EPID), cone beam CT (CBCT), CT-on-rail, digital radiography (DR), etc. Among them, the DR device mainly uses fixed or mobile orthogonal coplanar devices.

[0003] In daily clinical work using the DR device, quality control and quality assurance work need to be done to ensure that the mechanical precision and image quality of the device can meet the clinical requirements and ensure the safety of patient treatment. Specific inspection items include translation and rotation of the DR device, including position movement of the X-ray central axis, translation of the image detection plate, rotation accuracy; image quality, such as spatial resolution, high contrast resolution, low contrast resolution, etc. The quality control device of the coplanar DR generally uses a cubic phantom, so that the X-ray can be vertically shot into the phantom and imaged on the detection plate to perform quality control measurement.

[0004] However, some radiotherapy devices, such as Syberknife, Novalis, and some proton or heavy ion treatment rooms, use non-coplanar DR devices. The so-called coplanar refers to the fact that the beam center axis of the X-ray tube of the DR device and the rotating plane of the treatment gantry are in the same plane. If the beam center axis of the X-ray tube of the DR device and the rotating plane of the treatment gantry are not in the same plane, it is called non-coplanar. The non-coplanar DR device cannot use such a phantom because the beam angle of the non-coplanar DR device is different for each treatment room installation, and the source axis distance (SAD) and source image distance (SID) of each treatment room are different. Using different angles to shoot the cubic standard phantom cannot obtain a usable image. SUMMARY

[0005] In view of the above technical problems, the present disclosure provides a quality control phantom structure and a quality detection method, which are used to at least partially solve the above technical problems.

[0006] Based on this, the first aspect of the present disclosure provides a quality control phantom structure, the quality control phantom structure being used for a quality control device of a non-coplanar digital radiographic image-guided system, and the quality control phantom structure comprising: a support comprising three rotation axes corresponding to different rotation degrees of freedom respectively, for realizing rotation in any angle and direction in a three-dimensional space; and a mechanical precision detection phantom for rotating to be perpendicular to a central axis of a beam of the quality control device of the non-coplanar digital radiographic image-guided system under the driving action of the three rotation axes, so as to perform mechanical precision detection on the quality control device of the non-coplanar digital radiographic image-guided system based on a vernier principle.

[0007] According to the embodiment of the present disclosure, the material of the support is a low-atomic-number material.

[0008] According to the embodiment of the present disclosure, the low-atomic-number material comprises carbon fiber.

[0009] According to the embodiment of the present disclosure, the mechanical precision detection phantom comprises: a base material, the base material being engraved with scale lines, and the scale lines being filled with a high-atomic-number material, wherein the atomic number of the high-atomic-number material is greater than the atomic number of the base material.

[0010] According to the embodiment of the present disclosure, the scale lines comprise two intersecting straight line scale lines and a circular arc scale line with the intersection of the two straight lines as a center.

[0011] According to the embodiment of the present disclosure, the cross section of the mechanical precision detection phantom is a square.

[0012] The second aspect of the present disclosure provides a quality detection method based on the above quality control phantom structure, the quality detection method being used for a quality control device of a non-coplanar digital radiographic image-guided system, and the quality detection method comprising: after installation and debugging of the quality control device of the non-coplanar digital radiographic image-guided system, obtaining three rotation angles of a beam central axis relative to a treatment room coordinate system; installing the support at a preset position, rotating the support according to the three rotation angles, and rotating the mechanical precision detection phantom to be perpendicular to the beam central axis; and performing mechanical precision detection on the quality control device of the non-coplanar digital radiographic image-guided system based on a vernier principle.

[0013] According to the embodiment of the present disclosure, the mechanical precision detection on the quality control device of the non-coplanar digital radiographic image-guided system based on the vernier principle specifically comprises: under the condition that the mechanical precision detection phantom is rotated to be perpendicular to the beam central axis, an image is shot to obtain a test sheet; the test sheet is made to coincide with the center of a reference sheet saved in advance, readings are taken based on the scale lines on the test sheet and the reference sheet, and mechanical errors of the quality control device of the non-coplanar digital radiographic image-guided system are calculated according to the read scale values.

[0014] The third aspect of the present disclosure provides a quality control phantom structure, which is used for a quality control device of a non-coplanar digital radiographic image-guided system, and comprises: a support comprising three rotating shafts corresponding to different rotating degrees of freedom respectively, for realizing rotation at any angle and direction in a three-dimensional space; and an image quality detection phantom, which is rotated to be perpendicular to a central axis of a beam of the quality control device of the non-coplanar digital radiographic image-guided system under the driving action of the three rotating shafts, so as to perform image quality detection on the quality control device of the non-coplanar digital radiographic image-guided system.

[0015] The fourth aspect of the present disclosure provides a quality detection method based on the above quality control phantom structure, which is used for a quality control device of a non-coplanar digital radiographic image-guided system, and comprises: obtaining three rotating angles of a beam central axis relative to a treatment room coordinate system after installation and debugging of the quality control device of the non-coplanar digital radiographic image-guided system; installing the support at a preset position, rotating the support according to the three rotating angles, and rotating the image quality detection phantom to be perpendicular to the beam central axis; and performing image quality detection on the quality control device of the non-coplanar digital radiographic image-guided system based on the image quality detection phantom.

[0016] The quality control phantom structure and the quality detection method provided by the embodiments of the present disclosure have at least the following beneficial effects:

[0017] The support is composed of three rotating shafts capable of rotating along different rotating degrees of freedom, and can be rotated to any angle and direction in space, so that the detection phantom can be rotated to be perpendicular to the central axis of the beam, thereby enabling the mechanical precision and image quality of the device to be detected, and ensuring that the error results of the detected device can be detected more clearly.

[0018] Further, by setting the mechanical detection phantom as a structure with scale lines engraved on a base material, the error value of the translation or rotation of the device can be directly read from the image by using the principle of a vernier caliper, so that the error introduced when the image registration method is used for detection is avoided, and the reliability of the checking result is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and other objects, features and advantages of the present disclosure will become more apparent from the following description of embodiments of the present disclosure, taken in conjunction with the accompanying drawings, in which:

[0020] Figure 1 A structural diagram of a support provided by an embodiment of the present disclosure is schematically shown.

[0021] Figure 2 A structural diagram of a mechanical precision detection phantom provided by an embodiment of the present disclosure is schematically shown.

[0022] Figure 3A flow chart of the quality detection method provided by an embodiment of the present disclosure is schematically shown.

[0023] Figure 4 An effect diagram of the reference sheet being horizontally flipped and overlapping with the test sheet provided by an embodiment of the present disclosure is schematically shown.

[0024] Figure 5 An effect diagram of the reference sheet being horizontally flipped and overlapping with the center of the test sheet provided by an embodiment of the present disclosure is schematically shown.

[0025] Figure 6 An effect diagram of the X axis of the test sheet overlapping with the reference sheet provided by an embodiment of the present disclosure is schematically shown.

[0026] Figure 7 An effect diagram of the Y axis of the test sheet overlapping with the reference sheet provided by an embodiment of the present disclosure is schematically shown.

[0027] Figure 8 A distance relationship diagram between the source and the phantom and the image provided by an embodiment of the present disclosure is schematically shown.

[0028] Figure 9 A flow chart of the quality detection method provided by another embodiment of the present disclosure is schematically shown. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to the embodiments and the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present disclosure.

[0030] The terms used herein are only used to describe specific embodiments, and are not intended to limit the present disclosure. The terms "comprise", "contain", etc. used herein indicate the existence of the described features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0031] In the present disclosure, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connect", "fix", etc. should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0032] In the description of the disclosure, it needs to be understood that the terms "longitudinal", "length", "circumferential", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the disclosure and simplifying the description, and does not indicate or imply that the subsystems or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the disclosure.

[0033] Throughout the drawings, the same elements are denoted by the same or similar reference numerals. When it can cause confusion in understanding the disclosure, the conventional structure or configuration will be omitted. Also, the shape, size, positional relationship of the components in the drawings do not reflect the true size, scale and actual positional relationship. In addition, in the claims, any reference symbol located between parentheses should not be construed as a limitation on the claims.

[0034] Similarly, in order to simplify the disclosure and help understand one or more of the various disclosed aspects, in the above description of the exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure or description thereof. The description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the disclosure. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0035] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the disclosure, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0036] The disclosure provides a quality control phantom structure suitable for a quality control device of a non-coplanar DR image guided system. The quality control phantom structure includes a support and a phantom loaded on the support, and the phantom is rotated to the central axis of the beam of the quality control device of the non-coplanar DR image guided system by the support to perform quality detection. The specific embodiments will be described in detail below.

[0037] The first embodiment of the disclosure provides a quality control phantom structure, which may, for example, include:

[0038] The support comprises three rotating shafts corresponding to three degrees of freedom of rotation, and is used to realize rotation in any angle and direction in three-dimensional space.

[0039] The mechanical precision detection model body is used to rotate to the central axis of the beam of the quality control equipment of the non-coplanar digital radiographic image guidance system under the driving of the three rotating shafts, so as to detect the mechanical precision of the quality control equipment of the non-coplanar digital radiographic image guidance system based on the principle of a vernier caliper.

[0040] Figure 1 A structural diagram of the support provided by the embodiment of the present disclosure is schematically shown.

[0041] As shown in Figure 1 The support can comprise a base and three rotating shafts corresponding to three degrees of freedom of rotation. A high-precision electronic angle indicator can be installed on each rotating shaft to indicate the angle of each rotating shaft.

[0042] In the embodiment of the present disclosure, the material of the support is a low-atomic-number material, which needs to ensure that the beam current attenuation is very small under KV-level X-ray fluoroscopy, and has a small enough deformation amount. For example, the low-atomic-number material includes carbon fiber. Generally, in order to improve the contrast of the image, the equivalent atomic number of the low-atomic-number material is about 10, for example, the equivalent atomic number of carbon is 6, the equivalent atomic number of PMMA is 6.5, and the equivalent atomic number of water is about 7.5.

[0043] The mechanical precision detection model body comprises a base material, and a scale line is drawn on the base material, and the scale line is filled with a high-atomic-number material, wherein the atomic number of the high-atomic-number material is greater than the atomic number of the base material. The higher the atomic number of the high-atomic-number material, the better, for example, lead with an atomic number of 82 is selected.

[0044] Figure 2 A structural diagram of the mechanical precision detection model body provided by the embodiment of the present disclosure is schematically shown.

[0045] As shown in Figure 2 The mechanical precision detection model body is drawn on a low-atomic-number base material, and the scale line is filled with a high-atomic-number material. The cross section of the mechanical precision detection model body can be, for example, a square, for example, a mechanical precision detection model body with a side length of 100 mm and a thickness of 5 mm is selected.

[0046] In the embodiment of the present disclosure, the scale line has a straight scale line and a circular arc scale line, for example, it can comprise two intersecting straight scale lines and a circular arc scale line with the intersection of the two straight lines as the center.

[0047] Exemplarily, in a Cartesian coordinate system, the scale line of the positive direction of the X and Y axes is 25 small grids, each small grid being 2 mm, and the scale line of the negative direction of the X and Y axes is 26 small grids, each small grid being 1.923 mm. During detection, the image taken during acceptance testing is used as a reference image, the reference image is flipped horizontally or vertically, and then is overlapped with the image during quality control. The difference between the scale lines on both sides is 0.077 mm (2 mm-1.923 mm), which is the minimum detectable accuracy. The scale line of the circular arc is 31 small grids in the first and third quadrants, each small grid being 2.903°, and 30 small grids in the second and fourth quadrants, each small grid being 3°. Therefore, the minimum detectable accuracy is 0.097° (3°-2.903°).

[0048] The second embodiment of the present disclosure also provides a quality control phantom structure, which may, for example, include:

[0049] The support includes three rotation axes corresponding to different rotation degrees of freedom, and is used to realize rotation at any angle and in any direction in a three-dimensional space.

[0050] The image quality detection phantom is used to rotate to be perpendicular to the central axis of the beam of the quality control device of the non-coplanar digital radiographic image-guided system under the driving action of the three rotation axes, so as to detect the image quality of the quality control device of the non-coplanar digital radiographic image-guided system.

[0051] The support and Figure 1 The structures shown are the same, and will not be described here again. The image quality detection phantom may adopt an existing mature detection phantom, which will not be described here again.

[0052] Based on the above quality control phantom structure, the third embodiment of the present disclosure provides a quality detection method.

[0053] Figure 3 A flowchart of the quality detection method provided by the embodiment of the present disclosure is schematically shown.

[0054] As Figure 3 shown, the quality detection method may, for example, include operation S301 to operation S303.

[0055] In operation S301, after installation and debugging of the quality control device of the non-coplanar digital radiographic image-guided system, three rotation angles of the central axis of the beam relative to the coordinate system of the treatment room are obtained.

[0056] In operation S302, the support is installed at a preset position, the support is rotated according to the three rotation angles, and the mechanical precision detection phantom is rotated to be perpendicular to the central axis of the beam.

[0057] In operation S303, the quality control device of the non-coplanar digital radiographic image-guided system is detected in mechanical precision based on the principle of the vernier caliper.

[0058] Specifically, the operation S303 may, for example, include: in the case that the mechanical precision detection phantom is rotated to be perpendicular to the beam center axis, taking an image to obtain a test sheet. The test sheet is aligned with the center of a reference sheet pre-stored, a reading is made based on the scale lines on the test sheet and the reference sheet, and a mechanical error of the quality control device of the non-coplanar digital radiographic image-guided system is calculated according to the read scale value.

[0059] Exemplarily, in the case that the mechanical precision detection phantom is rotated to be perpendicular to the beam center axis, when the device acceptance test is performed, the mechanical precision detection phantom is loaded on the support, an image is taken, and saved as a reference sheet.

[0060] In the quality control detection, the phantom is inserted on the support, an image is taken, and saved as a test sheet.

[0061] Figure 4 An effect diagram of overlapping the reference sheet with the test sheet after the reference sheet is horizontally flipped is schematically shown. Figure 5 An effect diagram of overlapping the center of the reference sheet with the test sheet after the reference sheet is horizontally flipped is schematically shown. Figure 6 An effect diagram of overlapping the X axis of the test sheet with the reference sheet is schematically shown. Figure 7 An effect diagram of overlapping the Y axis of the test sheet with the reference sheet is schematically shown.

[0062] First, the reference sheet is horizontally flipped and overlapped with the test sheet, and analyzed, as shown in Figure 4 .

[0063] Second, the center of the test sheet is moved to coincide with the center of the reference sheet, as shown in Figure 5 .

[0064] Next, the reading starts from the positive direction of the Y axis of the reference sheet, and stops until the inner scale and the outer scale coincide at the 21st scale line, since the difference between the inner scale and the outer scale per small block is: 3°-2.903°=0.097°, Figure 5 , the rotation angle is 0.097×21=2.037°, since the rotation angle of the test sheet relative to the reference sheet is in the counterclockwise direction, it can be detected that the rotation angle of the image plate is in the clockwise direction relative to the standard position, and the rotation angle is 2.037°.

[0065] Next, the reference sheet is opened again, flipped horizontally, and overlapped with the test sheet, the test sheet is rotated by 2.037° in the clockwise direction, and translated to make the X axis coincide with the reference sheet, as shown in Figure 6 . Figure 6The upper and lower scale lines of the 18th scale line in the figure coincide. Since the difference between each division of the upper and lower scale lines is 2 - 1.923 = 0.077 mm, and the 18th scale line in the figure coincides, the translation distance in the X-axis direction can be obtained as: 0.077 × 18 = 1.38 mm.

[0066] Next, reopen the reference film, flip it vertically, and overlap it with the test film for comparison. Rotate the test film clockwise by 2.037° and translate it so that the Y-axis coincides with the reference film, as shown below. Figure 7 As shown, when reading the Y-axis scale, the upper and lower scale lines of the 8th scale line coincide. Since the difference between each division of the upper and lower scale lines is 2 - 1.923 = 0.077 mm, Figure 7 The 8th scale line in the middle coincides, but since the horizontal coordinate of the test piece has exceeded one small division of the reference piece, the translation distance in the Y-axis direction is 2 + 0.077 × 8 = 2.615 mm.

[0067] Figure 8 The diagram illustrates the distance relationships between the source, the phantom, and the image provided in the embodiments of this disclosure.

[0068] like Figure 8 As shown, when the distance from the source to the phantom is SAD and the distance from the source to the image plate is SID, the above translation distances are SID / SAD times the calculated values. The rotation error does not change with the changes in SID and SAD distances. The image plate has three translation directions and three rotation directions. The mechanical precision testing phantom in this disclosure can only detect errors in two translation directions and one rotation direction. The remaining translation direction is the direction of distance change between the image plate and the source. The small movement in this direction has a very small impact on the IGRT results. The rotation in the other two directions also has a small impact on IGRT. Therefore, it can be ignored in routine quality control.

[0069] Based on the above-described quality control phantom structure, the fourth embodiment of this disclosure provides a quality testing method.

[0070] Figure 9 A flowchart illustrating a quality inspection method provided in another embodiment of this disclosure is shown schematically.

[0071] like Figure 9 As shown, the quality inspection method may include, for example, operations S901 to S903.

[0072] After the installation and debugging of the quality control equipment of the non-coplanar digital radiography image guidance system, the S901 was used to obtain three rotation angles of the beam center axis relative to the coordinate system of the treatment room.

[0073] When operating S902, the bracket is installed in the preset position, and the bracket is rotated according to three rotation angles to rotate the mechanical precision detection model to be perpendicular to the beam center axis.

[0074] At operation S903, the quality control device of the non-coplanar digital radiographic image guided system is detected in image quality based on the phantom.

[0075] According to the quality control phantom structure and the quality detection method provided by the embodiments of the present disclosure, on the one hand, the support can be rotated to any angle in space, so that the detection phantom is perpendicular to the central axis of the beam, and the error result of the detected device can be detected more clearly. On the other hand, the mechanical precision phantom uses the principle of vernier caliper, and the error value of translation or rotation can be directly read from the image. If the error value is greater than the threshold value of detection, the device needs to be calibrated. Although the image registration method can be used to detect the translation and rotation error between the reference image and the detection image, the error of the image registration algorithm will be introduced. Since it is quality control, other errors need to be excluded, and the scale line method used in the present disclosure can exclude the error introduced by the image registration algorithm, so that the test result is more reliable.

[0076] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present disclosure. It should be understood that the above description is only a specific embodiment of the present disclosure and is not intended to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A quality control phantom structure, characterized in that, The quality control phantom structure is used for a quality control device of a non-coplanar digital radiographic image-guided system, and the quality control phantom structure comprises: a support comprising three rotating shafts corresponding to different rotating degrees of freedom respectively, and used for realizing rotation in any angle and direction in a three-dimensional space; a mechanical precision detection phantom used for rotating to be perpendicular to a central axis of a beam of the quality control device of the non-coplanar digital radiographic image-guided system under the driving action of the three rotating shafts, so as to detect mechanical precision of the quality control device of the non-coplanar digital radiographic image-guided system based on a vernier principle.

2. The quality control phantom structure of claim 1, wherein, The material of the support is a low-atomic-number material.

3. The quality control phantom structure of claim 2, wherein, The low-atomic-number material comprises carbon fibers.

4. The quality control phantom structure of claim 1, wherein, The mechanical precision detection phantom comprises: a base material, wherein a scale line is drawn on the base material, and the scale line is filled with a high-atomic-number material, and wherein the atomic number of the high-atomic-number material is greater than that of the base material.

5. The quality control phantom structure of claim 4, wherein, The scale line comprises two intersecting straight line scale lines and a circular arc scale line with the intersection of the two straight lines as a center.

6. The quality control phantom structure of claim 1, wherein, The cross section of the mechanical precision detection phantom is a square.

7. A method for quality detection based on the quality control phantom structure according to any one of claims 1-6, characterized in that, The quality detection method is used for a quality control device of a non-coplanar digital radiographic image-guided system, and the quality detection method comprises: after installation and debugging of the quality control device of the non-coplanar digital radiographic image-guided system, obtaining three rotating angles of a central axis of a beam relative to a treatment room coordinate system; installing a support at a preset position, rotating the support according to the three rotating angles, and rotating a mechanical precision detection phantom to be perpendicular to the central axis of the beam; detecting mechanical precision of the quality control device of the non-coplanar digital radiographic image-guided system based on a vernier principle.

8. The quality detection method of claim 7, wherein, The mechanical precision detection of the quality control device of the non-coplanar digital radiographic image-guided system based on the vernier principle specifically comprises: under the condition that the mechanical precision detection phantom is rotated to be perpendicular to the central axis of the beam, an image is captured to obtain a test sheet; the test sheet is made to coincide with the center of a reference sheet saved in advance, readings are taken based on scale lines on the test sheet and the reference sheet, and mechanical errors of the quality control device of the non-coplanar digital radiographic image-guided system are calculated according to the read scale values.

9. A quality control phantom structure, characterized by The quality control phantom structure is used for a quality control device of a non-coplanar digital radiographic image-guided system, and the quality control phantom structure comprises: a support comprising three rotating shafts corresponding to different rotating degrees of freedom respectively, and used for realizing rotation in any angle and direction in a three-dimensional space; an image quality detection phantom used for rotating to be perpendicular to a central axis of a beam of the quality control device of the non-coplanar digital radiographic image-guided system under the driving action of the three rotating shafts, so as to detect image quality of the quality control device of the non-coplanar digital radiographic image-guided system.

10. A quality detection method based on the quality control phantom structure of claim 9, characterized in that, The quality detection method is used for a quality control device of a non-coplanar digital radiographic image-guided system, and the quality detection method comprises: after installation and debugging of the quality control device of the non-coplanar digital radiographic image-guided system, obtaining three rotating angles of a central axis of a beam relative to a treatment room coordinate system; The support is installed at a preset position, the support is rotated according to the three rotation angles, and the image quality detection model is rotated to be perpendicular to the beam central axis; Image quality detection is performed on the non-coplanar digital radiographic image guidance system quality control equipment based on the image quality detection model.

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