CT detection system and CT detection method therefor

Abstract

The invention provides a CT (computed tomography) detection system. The CT detection system comprises a conveyor belt, a detector and a controller, wherein the conveyor belt is used for conveying a detected object to a detection position in the CT detection system; the distributed ray source is located on the first side of the conveying belt and comprises a plurality of sub-target spots which are fixedly arranged at equal intervals in the extending direction of the conveying belt; the detector is located at an exposure position, corresponding to the detection position, in a second side, opposite to the first side, of the conveying belt, is used for receiving rays which are emitted by a plurality of sub target spots and penetrate through a detected object located at the detection position to generate an exposure image, and can move in the extending direction of the conveying belt; and the maximum moving distance is not less than the distance between the adjacent sub-target spots. The invention further relates to a detection method capable of being used for the CT detection system.

Description

Technical Field

[0001] The present disclosure relates to the field of detection technology, and in particular, to a CT detection system and a CT detection method for the CT detection system, which can compensate for failed sub-targets. Background Art

[0002] CT (Computed Tomography) testing, as a highly effective inspection technology, is increasingly being used in product quality testing. CT testing uses online CT scanning and reconstruction to obtain information about an object's internal structure and composition, enabling non-destructive testing of products. Compared to traditional X-ray DR imaging, CT technology can obtain non-overlapping three-dimensional images of an object's interior, enabling more accurate identification of an object's structure and composition.

[0003] Currently, in CT detection technology, multiple spatially distributed sub-targets can be used to construct a distributed ray source to achieve a static CT imaging mode that replaces rotational scanning. Using a distributed ray source, the CT detection system can perform multi-view image acquisition without rotating the object being inspected or the imaging component, thereby simultaneously acquiring two-dimensional projection images from multiple viewpoints to complete CT scan reconstruction; at the same time, multi-view DR (Digital Radiography) shooting can be performed according to actual needs (without the multiple angles and reconstruction required by CT). Multi-view DR can be used to construct a certain depth perception capability, thus providing pseudo-three-dimensional information. Therefore, a CT detection system including a distributed ray source can achieve rapid imaging, which is particularly suitable for product quality inspection in high-speed production lines.

[0004] However, the CT detection system of distributed ray sources may have the problem of missing the angle projection image corresponding to the failed sub-target due to the failure of the sub-target, resulting in the loss of the projection angle information during reconstruction and the degradation of image quality. Summary of the Invention

[0005] According to a first aspect of the present disclosure, a CT detection system is provided, comprising: a conveyor belt, a distributed radiation source, and a detector. The conveyor belt is used to convey an object to be inspected to a detection position in the CT detection system. The distributed radiation source is located on a first side of the conveyor belt, and includes a plurality of sub-target points fixedly arranged at equal intervals along the extension direction of the conveyor belt. The detector is located at an exposure position corresponding to the detection position on a second side of the conveyor belt opposite to the first side, and is used to receive radiation emitted by the plurality of sub-target points and passing through the object to be inspected at the detection position to generate an exposure image. The detector is capable of moving along the extension direction of the conveyor belt, and its maximum moving distance is not less than the spacing between adjacent sub-target points.

[0006] According to some exemplary embodiments, the detector is further movable along a direction perpendicular to the exposure surface of the detector.

[0007] According to the second aspect of the present disclosure, a CT detection method is provided, which can be applied to the CT detection system according to the first aspect of the present disclosure and its exemplary embodiments. The CT detection method includes: pre-inspecting multiple sub-targets in the distributed ray source to determine a failed sub-target; based on the failed sub-target, obtaining information related to the failed sub-target; based on the information related to the failed sub-target, determining a compensation sub-target to replace the failed sub-target; based on the compensation sub-target and the information related to the failed sub-target, determining the compensation imaging position and the compensation exposure position, wherein the imaging angle of the compensation sub-target relative to the compensation imaging position is the same as the imaging angle of the failed sub-target relative to the detection position; controlling the conveyor belt to convey the inspected object to the compensation imaging position; moving the detector to the compensation exposure position; causing the compensation sub-target to emit a beam and causing the detector to expose to generate a replacement image corresponding to the failed sub-target.

[0008] According to some exemplary embodiments, the pre-inspection of the multiple sub-target points in the distributed ray source and the determination of failed sub-target points include: causing the multiple sub-target points in the distributed ray source to emit beams in sequence and causing the detector to expose in sequence to obtain an exposure result for each sub-target point; and determining the sub-target point corresponding to the exposure result less than the exposure threshold among the exposure results of the multiple sub-target points as the failed sub-target point.

[0009] According to some exemplary embodiments, obtaining information related to the failed sub-target based on the failed sub-target includes: obtaining the sub-target serial number of the failed sub-target; and determining the imaging angle of the failed sub-target relative to the detection position based on the failed sub-target.

[0010] According to some exemplary embodiments, determining the compensating sub-target to replace the failed sub-target based on information related to the failed sub-target includes: determining the sub-target corresponding to the previous sub-target number or the next sub-target number of the sub-target number of the failed sub-target as the compensating sub-target.

[0011] According to some exemplary embodiments, determining the compensation imaging position and the compensation exposure position based on the compensation sub-target and the information related to the failed sub-target includes: determining the compensation imaging position based on the position of the compensation sub-target and the imaging angle; determining the moving distance that the detector needs to move based on the compensation imaging position and the detection position; and determining the compensation exposure position based on the exposure position and the moving distance.

[0012] According to some exemplary embodiments, acquiring information related to the failed sub-target point based on the failed sub-target point includes: acquiring a sub-target point sequence number of the failed sub-target point; and acquiring a distance between adjacent sub-target points among the multiple sub-target points.

[0013] According to some exemplary embodiments, determining the compensating sub-target to replace the failed sub-target based on information related to the failed sub-target includes: determining the sub-target corresponding to the previous sub-target number or the next sub-target number of the sub-target number of the failed sub-target as the compensating sub-target.

[0014] According to some exemplary embodiments, determining the compensation imaging position and the compensation exposure position based on the compensation sub-target and information related to the failed sub-target includes: determining the compensation imaging position based on the detection position and the distance; and determining the compensation exposure position based on the exposure position and the distance.

[0015] According to some exemplary embodiments, the CT detection method further includes: controlling the conveyor belt to convey the object to be inspected to the detection position; causing all valid sub-target points to emit beams in sequence, and causing the detector to be exposed in sequence to generate a set of multi-angle images of the object to be inspected; and reconstructing and generating a CT detection image of the object to be inspected based on the set of multi-angle images and the replacement image. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Hereinafter, various exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings; in the accompanying drawings:

[0017] Figure 1 Schematically illustrates the structure of a CT detection system according to an exemplary embodiment of the present disclosure;

[0018] Figure 2 A CT detection method according to an exemplary embodiment of the present disclosure is schematically illustrated in the form of a flow chart;

[0019] Figure 3 According to an exemplary embodiment of the present disclosure, it is schematically shown Figure 2 Details of the CT detection method shown;

[0020] Figure 4 According to an exemplary embodiment of the present disclosure, it is schematically shown Figure 2 Details of the CT detection method shown;

[0021] Figure 5 According to an exemplary embodiment of the present disclosure, it is schematically shown Figure 2 Details of the CT detection method shown;

[0022] Figure 6 According to an exemplary embodiment of the present disclosure, it is schematically shown Figure 5 The operation process of the CT detection method shown;

[0023] Figure 7 According to another exemplary embodiment of the present disclosure, it is schematically shown Figure 2 Details of the CT detection method shown;

[0024] Figure 8 According to another exemplary embodiment of the present disclosure, it is schematically shown Figure 2 Details of the CT detection method shown;

[0025] Figure 9 According to another exemplary embodiment of the present disclosure, it is schematically shown Figure 8 The operation process of the CT detection method is shown.

[0026] It should be understood that the accompanying drawings are merely schematic illustrations of exemplary embodiments of the present disclosure and are not intended to limit the present disclosure and are not necessarily drawn to scale. In addition, in the accompanying drawings, identical or similar features are indicated by identical or similar reference numerals. DETAILED DESCRIPTION

[0027] Various exemplary embodiments of the present disclosure are described below in conjunction with the accompanying drawings so that those skilled in the art can fully understand and implement the technical solutions according to the present disclosure.

[0028] See also Figure 1 , which schematically shows the structure of a CT detection system according to an exemplary embodiment of the present disclosure. Figure 1 As shown, the CT detection system 100 may include a conveyor belt 110, a distributed radiation source 120, and a detector 130. The conveyor belt 110 may be configured to be arranged along the extending direction indicated by the double-arrow line A. A plurality of objects 111 to be inspected may be placed on the conveyor belt 110. Therefore, the conveyor belt 110 may be used to convey the objects 111 to be inspected along the conveying direction (i.e., Figure 1The distributed light source 120 can be located on one side of the conveyor belt 110 and arranged along the extension direction of the conveyor belt 110 (i.e., the direction indicated by the double-arrow line A) to expose and image the object 111 at the detection position 112. The distributed light source 120 can include a support member 121 and a plurality of sub-targets 122 arranged on the support member 121. Figure 1 In the illustrated embodiment, the support member 121 is linear and arranged substantially parallel to the conveyor belt 110, with the distance between them being pre-set to a distance D. Multiple sub-target points 122 can be fixedly arranged at equal intervals L along the extending direction of the conveyor belt 110. That is, the linear trajectory formed by the multiple sub-target points 122 is parallel to the conveyor belt 110. The detector 130 can be arranged on the other side of the conveyor belt 110, that is, the distributed radiation source 120 and the detector 130 are located on either side of the conveyor belt 110. The detector 130 is positioned at an exposure position corresponding to the inspection position 112. Thus, the detector 130 can receive radiation emitted by the multiple sub-target points 122 and passing through the object at the inspection position 112, thereby generating an exposure image. In the CT inspection system 100, the detector 130 can move in the direction indicated by the double-arrow line A (e.g., the detector 130 can include a controllable displacement device), and its maximum movement distance is no less than the spacing L between adjacent sub-target points 122.

[0029] It should be understood that, in the present disclosure, a distributed ray source refers to a vacuum device in which multiple X-ray point sources (i.e., sub-targets) are densely arranged in a certain spatial sequence in a single vacuum chamber. Typically, the sub-targets in a distributed ray source can be arranged along a straight trajectory, but this is not restrictive. In some cases, the sub-targets in a distributed ray source can be arranged along a curved trajectory. A distributed ray source has a high-power, high-voltage anode generator, and the sub-targets are densely distributed, fixed in position, and there are a large number of sub-targets. In application, each sub-target can be exposed through programmed control, so the exposure time is relatively short, which is suitable for fast shooting with a high frame rate detector.

[0030] It can be seen that for CT detection systems, distributed radiation sources have the following advantages: First, the number of sub-targets is relatively large, so the number of times the stitching angle needs to be adjusted is small during CT imaging; second, the instantaneous power is large, so high signal-to-noise ratio images can be obtained within the same imaging time; third, the exposure rate is fast, making it suitable for production line imaging with high-speed detection requirements.

[0031] During the operation of the CT detection system 100, the object 111 can be conveyed to the detection position 112 in the imaging area by the conveyor belt 110, and then the multiple sub-target points 122 on the distributed radiation source 120 can emit beams in sequence, so that they can be exposed in sequence by the detector 130 to generate a set of multi-angle images of the object 111. These multi-angle images can be used to reconstruct and generate a CT detection image of the object 111.

[0032] In some embodiments, the detector 130 may include a controllable multi-axis displacement device, thereby enabling the detector 130 to move not only along the direction indicated by the double-arrow line A, but also along at least one direction perpendicular to the direction indicated by the double-arrow line A. For example, the detector 130 may be moved closer to or farther from the detection position 112.

[0033] In the CT detection system 100 according to the present disclosure, since the detector 130 can move along the direction indicated by the double-arrow line A, and its maximum movement distance is no less than the spacing L between adjacent sub-target points 122, when a sub-target point 122 included in the distributed radiation source 120 fails, the detector 130 can be moved to an appropriate compensation exposure position to receive radiation emitted by the compensation sub-target point that replaces the failed sub-target point for exposure, thereby generating a replacement image corresponding to the failed sub-target point. This replacement image can then be used together with the multi-angle images of the object generated by other valid sub-target points to reconstruct a CT detection image of the object. Therefore, even if a sub-target point 122 fails, the CT detection system 100 according to the present disclosure can still generate a set of multi-angle images of the object, which can then be used to reconstruct a CT detection image of the object.

[0034] In addition, the terms "conveyor belt" and "detector" in the present disclosure should be understood in a broad sense. For example, the term "conveyor belt" in the present disclosure refers to any suitable conveying device extending in a linear manner that conveys the inspected object from one position to a target position in a production line. It may include a belt-like component (such as a belt, etc.) or may not include a belt-like component (for example, it may include a conveying device composed of multiple rolling shafts arranged in sequence), which can be arranged in a straight line, but may also include curved parts. The term "detector" in the present disclosure refers to any suitable detection device that can sense the rays emitted by a ray source, thereby forming an exposure image of the inspected object.

[0035] See also Figure 2 , which schematically illustrates a CT detection method according to an exemplary embodiment of the present disclosure in the form of a flow chart. Figure 2As shown, the CT detection method 200 starts from step 210. At step 220, a pre-inspection is performed on multiple sub-target points in the distributed ray source to determine whether there is a failed sub-target point among the multiple sub-target points.

[0036] See also Figure 3 , which schematically shows an exemplary embodiment of the present disclosure. Figure 2 The details of step 220 in the CT detection method 200 are shown in FIG. Figure 3 As shown, in this embodiment, step 220 may include steps 221 and 222. Specifically, in step 221, beams are sequentially emitted from multiple sub-target points in the distributed radiation source and the detector is sequentially exposed to obtain exposure results for each sub-target point; and in step 222, the sub-target point corresponding to the exposure result less than the exposure threshold among the exposure results of the multiple sub-target points is determined as the failed sub-target point.

[0037] Continue to see Figure 2 In step 230, the CT detection method 200 determines whether there are any failed sub-targets among the multiple sub-targets based on the pre-inspection results obtained in step 220. If no failed sub-targets exist, the CT detection method 200 may proceed to step 250 to control the conveyor belt to transport the object to be inspected to the inspection position. In step 251, all valid sub-targets may be sequentially beamed (i.e., emit X-rays) and the detectors may be sequentially exposed to generate a set of multi-angle images of the object to be inspected. In step 252, a CT detection image of the object to be inspected may be reconstructed based on the set of multi-angle images. The CT detection method 200 may then terminate in step 260.

[0038] If, at step 230, the CT inspection method 200 determines that a failed sub-target exists among the multiple sub-targets, the method proceeds to step 240 to obtain information related to the failed sub-target based on the failed sub-target. At step 241, a compensation sub-target to replace the failed sub-target can be determined based on the information related to the failed sub-target. At step 242, the compensation imaging position and the compensation exposure position can be determined based on the compensation sub-target and the information related to the failed sub-target.

[0039] See also Figure 4 , which schematically shows an exemplary embodiment of the present disclosure. Figure 2 The details of step 240 in the CT detection method 200 are shown in FIG. Figure 4As shown, in this embodiment, step 240 may include steps 240a-1 and 240a-2. Specifically, in step 240a-1, the sub-target number of the failed sub-target may be obtained; and in step 240a-2, based on the failed sub-target, the imaging angle of the failed sub-target relative to the detection position is determined. Because the spacing L between adjacent sub-targets and the distance D between the distributed radiation source and the detection position are both pre-set, once the sub-target number of the failed sub-target is obtained, the imaging angle of the failed sub-target relative to the detection position can be calculated. In other embodiments, the imaging angle of each sub-target relative to the detection position may be pre-set and stored in a storage device. Therefore, once the sub-target number of the failed sub-target is obtained, the imaging angle of the failed sub-target relative to the detection position can be directly read from the storage device. It should be understood that the present disclosure does not impose any limitations on the specific method for obtaining the imaging angle of the failed sub-target relative to the detection position.

[0040] See also Figure 5 See also Figure 4 , Figure 5 According to an exemplary embodiment of the present disclosure, it is schematically shown Figure 2 The details of steps 241 and 242 in the CT detection method 200 are shown in FIG. Figure 5 As shown, in this embodiment, step 241 can be specifically implemented as step 241', namely: the sub-target corresponding to the sub-target number preceding or following the sub-target number of the failed sub-target is determined as the compensation sub-target. Step 242 can specifically include steps 242a-1, 242a-2, and 242a-3. Specifically, in step 242a-1, the compensation imaging position is determined based on the position of the compensation sub-target and the imaging angle; in step 242a-2, the required movement distance of the detector is determined based on the compensation imaging position and the detection position; and in step 242a-3, the compensation exposure position is determined based on the exposure position and the movement distance. In other words, in this embodiment, the adjacent sub-target of the failed sub-target is selected as the compensation sub-target, and the compensation imaging position and compensation exposure position can be determined through geometric analysis based on the acquired imaging angle and the position of the compensation sub-target.

[0041] See also Figure 6 See also Figure 5 , Figure 6 According to an exemplary embodiment of the present disclosure, it is schematically shown Figure 5 The steps of the CT detection method shown are an operation process when applied to a CT detection system. Figure 6 China-Israel Figure 1 The CT detection system 100 shown is used as an example to Figure 5The steps of the CT detection method shown are described, but it should be understood that this is not restrictive. Figure 5 The steps of the illustrated CT inspection method can be applied to any suitable CT inspection system.

[0042] In the CT inspection system 100, after pre-inspection in step 220, for example, it is determined that sub-target point 122b is inoperative. Therefore, in step 240a-1, the sub-target point number of sub-target point 122b can be obtained. In step 240a-2, the imaging angle α of the inoperative sub-target point 122b relative to the inspection position can be determined. For example, the value of the imaging angle α can be calculated based on the spacing L and the distance D. In this embodiment, in step 241', the sub-target point 122a corresponding to the sub-target point number immediately preceding sub-target point 122b can be selected as the compensation sub-target point. In step 242a-1, a compensation imaging position 112' for the inspection object can be determined based on the position and imaging angle α of the compensation sub-target point 122a. In this manner, the imaging angle α' of the compensation sub-target point 122a relative to the compensation imaging position 112' is equal to or substantially equal to the imaging angle α of the inoperative sub-target point 122b relative to the inspection position 122. In step 242a-2, the moving distance P that the detector 130 needs to move can be determined based on the compensated imaging position 112' and the detection position 112. In step 242a-3, the compensated exposure position (i.e. Figure 6 (The position shown by the slightly larger dotted box in the figure). Figure 6 As shown, based on the existing exposure position, it is translated along the extension direction of the conveyor belt 110 toward the compensation sub-target point 122a by the above-mentioned moving distance P, and the obtained position can be determined as the compensation exposure position.

[0043] therefore, Figure 5 and Figure 6 The embodiment of the present invention illustrates a method for determining a compensation imaging position and a compensation exposure position based on the imaging angle of the failed sub-target relative to the detection position. Determining the compensation imaging position based on the imaging angle of the failed sub-target relative to the detection position ensures that the imaging angle of the compensation sub-target relative to the compensation imaging position is the same as the imaging angle of the failed sub-target relative to the detection position. This allows the imaging of the inspection object by the compensation sub-target to replace the imaging of the inspection object by the failed sub-target, and can then be used to reconstruct a CT inspection image of the inspection object.

[0044] See also Figure 7 , which schematically shows, according to another exemplary embodiment of the present disclosure, Figure 2 The details of step 240 in the CT detection method are shown in FIG. Figure 7As shown, in this embodiment, step 240 may include steps 240b-1 and 240b-2. Specifically, in step 240b-1, the sub-target number of the failed sub-target may be obtained; and in step 240b-2, the spacing between adjacent sub-targets in the plurality of sub-targets may be obtained. In some embodiments, the spacing between adjacent sub-targets is pre-set and stored in a storage device, and thus, the spacing may be directly read from the storage device.

[0045] See also Figure 8 See also Figure 7 , Figure 8 According to another exemplary embodiment of the present disclosure, it is schematically shown Figure 2 The details of steps 241 and 242 in the CT detection method 200 are shown in FIG. Figure 8 As shown, in this embodiment, step 241 can be specifically implemented as step 241', namely: the sub-target corresponding to the sub-target number preceding or following the sub-target number of the sub-target number of the failed sub-target is determined as the compensation sub-target. Step 242 can specifically include steps 242b-1 and 242b-2. Specifically, in step 242b-1, the compensation imaging position can be determined based on the detection position and the spacing; and in step 242b-2, the compensation exposure position can be determined based on the exposure position and the spacing. That is, in this embodiment, the adjacent sub-targets of the failed sub-target are selected as the compensation sub-targets, and based on the obtained spacing between the adjacent sub-targets, the compensation imaging position and the compensation exposure position can be determined through geometric analysis.

[0046] See also Figure 9 See also Figure 8 , Figure 9 According to another exemplary embodiment of the present disclosure, it is schematically shown Figure 8 The steps of the CT detection method shown are an operation process when applied to a CT detection system. Figure 9 China-Israel Figure 1 The CT detection system 100 shown is used as an example to Figure 8 The steps of the CT detection method shown are described, but it should be understood that this is not restrictive. Figure 8 The steps of the illustrated CT inspection method can be applied to any suitable CT inspection system.

[0047] In the CT detection system 100, after the pre-check in step 220, for example, it is determined that the sub-target point 122b is invalid. Therefore, in step 240b-1, the sub-target point number of the sub-target point 122b can be obtained; in step 240b-2, the distance L between adjacent sub-target points in the plurality of sub-target points can be obtained. In step 242b-1, the compensation imaging position 112' can be determined based on the detection position 112 and the distance L. For example, the position obtained by moving the detection position 112 toward the sub-target point 122b along the extension direction of the conveyor belt 110 by the distance L can be determined as the compensation imaging position 112'. Figure 9 As can be clearly seen in the figure, connecting the failed sub-target 122b, the compensating sub-target 122a, the compensating imaging position 112', and the detection position 112 in sequence forms a parallelogram. Therefore, the imaging angle α' of the compensating sub-target 122a relative to the compensating imaging position 112' is equal to or approximately equal to the imaging angle α of the failed sub-target 122b relative to the detection position 122. In step 242b-2, the compensating exposure position can be determined based on the exposure position and the distance. For example, the detector 130 can be translated by a distance L along the extension direction of the conveyor belt 110 toward the sub-target 122b, and the resulting position can be determined as the compensating exposure position.

[0048] therefore, Figure 8 and Figure 9 The embodiment illustrates a method for determining the compensation imaging position and compensation exposure position based on the spacing between adjacent sub-targets. Because the lines connecting the failed sub-target, the compensation sub-target, the compensation imaging position, and the detection position form a parallelogram, the imaging angle of the compensation sub-target relative to the compensation imaging position is guaranteed to be the same as the imaging angle of the failed sub-target relative to the detection position. This allows the compensation sub-target's image of the object to be used to replace the failed sub-target's image of the object, and can then be used to reconstruct a CT detection image of the object. Furthermore, making adjustments based directly on the spacing between adjacent sub-targets avoids complex calculations, making it more convenient.

[0049] Continue to see Figure 2After determining the compensation imaging position and the compensation exposure position, the CT detection method 200 may proceed to step 243, in which the conveyor belt is controlled to convey the object under inspection to the compensation imaging position. In step 244, the detector is moved to the compensation exposure position. In step 245, the compensation sub-target is emitted and the detector is exposed to generate a replacement image corresponding to the failed sub-target. The CT detection method 200 may then proceed to step 250 and sequentially execute steps 250, 251, and 252, and terminate at step 260. It should be understood that in the case of a failed sub-target, a CT detection image of the object under inspection is reconstructed in step 252 based on the replacement image generated in step 245 and the multi-angle image generated in step 251.

[0050] Therefore, in the CT inspection method 200 according to the present disclosure, by using adjacent sub-targets among the failed sub-targets as compensating sub-targets and controlling the detector to move to a compensating exposure position to receive radiation emitted by the compensating sub-targets that replace the failed sub-targets for exposure, a replacement image corresponding to the failed sub-targets can be generated. Therefore, even if a failed sub-target exists among the multiple sub-targets 122, the CT inspection method 200 according to the present disclosure can still generate a set of multi-angle images of the inspection object, which can then be used to reconstruct a CT inspection image of the inspection object.

[0051] Figure 6 and Figure 9 The following examples show the situation where the sub-target point with the previous serial number of the failed sub-target point is determined as the compensation sub-target point. However, it should be understood that it is also possible to determine the sub-target point with the next serial number after the failed sub-target point as the compensation sub-target point. Figures 4 to 9 In the illustrated embodiments, sub-target points adjacent to the failed sub-target point are selected as compensation sub-target points. However, in other embodiments, sub-target points not adjacent to the failed sub-target point can also be selected as compensation sub-target points, and the CT detection method according to the teachings of the present disclosure can still be implemented. When non-adjacent sub-target points are selected as compensation sub-target points, the maximum movement distance of the detector needs to be greater to enable movement to the compensation exposure position. For example, when there is a spacer sub-target point between the selected compensation sub-target point and the failed sub-target point, the maximum movement distance of the detector should be no less than twice the spacing between adjacent sub-target points.

[0052] The terms used in this disclosure are only used to describe the embodiments in this disclosure and are not intended to limit this disclosure. As used in this disclosure, the singular forms "a", "an" and "the" are intended to also include the plural forms, unless the context clearly indicates otherwise. It is also to be understood that the terms "include" and "comprise" when used in this disclosure refer to the presence of the features described, but do not exclude the presence of one or more other features or the addition of one or more other features. As used in this disclosure, the term "and / or" includes any and all combinations of one or more of the associated listed items. It will be understood that although the terms "first", "second", "third" etc. can be used to describe various features in this disclosure, these features should not be limited by these terms. These terms are only used to distinguish one feature from another.

[0053] Unless otherwise defined, all terms (including technical and scientific terms) used in this disclosure have the same meaning as commonly understood by those skilled in the art to which this disclosure belongs. It is also understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant art and / or the context of this specification, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this disclosure.

[0054] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction and without violating technical principles, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, or may omit some technical features from the different embodiments or examples described in this specification, and the embodiments or examples obtained based on such combination, combination or omission are also considered to fall within the scope of the present disclosure.

[0055] The method described in the present disclosure includes one or more steps or actions. These method steps and / or actions do not have to be performed in the order described in the present disclosure, but can be performed in a different order, for example, they can be performed simultaneously or in a reverse order, as long as they do not conflict with the principles of the technical solutions described in the present disclosure. In addition, according to actual needs, the steps or actions in the method described in the present disclosure can be replaced with different steps or actions, or can also include additional steps or actions.

[0056] Although the present disclosure has been described in detail in conjunction with certain exemplary embodiments, it is not to be limited to the specific forms described in this disclosure. Rather, the scope of the present disclosure is limited only by the appended claims.

Claims

1. A CT detection system, characterized in that: include: a conveyor belt, the conveyor belt being used to convey the object to be inspected to a detection position in the CT detection system; a distributed ray source, the distributed ray source being located on a first side of the conveyor belt and comprising a plurality of sub-target points fixedly arranged at equal intervals along an extending direction of the conveyor belt; a detector located at an exposure position corresponding to the detection position on a second side of the conveyor belt opposite to the first side, and configured to receive radiation emitted by the plurality of sub-target points and passing through the inspected object located at the detection position to generate an exposure image; the detector being movable along an extension direction of the conveyor belt, with a maximum movable distance being no less than a spacing between adjacent sub-target points.

2. The CT detection system according to claim 1, characterized in that: The detector is also movable in a direction perpendicular to the exposure surface of the detector.

3. A CT detection method for the CT detection system according to claim 1, characterized in that: include: Pre-checking multiple sub-target points in the distributed ray source to determine failed sub-target points; Based on the failed sub-target, acquiring information related to the failed sub-target; determining, based on information related to the failed sub-target point, a compensation sub-target point for replacing the failed sub-target point; determining the compensation imaging position and the compensation exposure position based on the compensation sub-target and information related to the failure sub-target, wherein an imaging angle of the compensation sub-target relative to the compensation imaging position is the same as an imaging angle of the failure sub-target relative to the detection position; controlling the conveyor belt to convey the inspected object to the compensation imaging position; moving the detector to the compensation exposure position; The compensating sub-target is emitted and the detector is exposed to light to generate a replacement image corresponding to the failed sub-target.

4. The CT detection method according to claim 3, characterized in that: Pre-checking the plurality of sub-targets in the distributed ray source to determine the failed sub-targets includes: causing the plurality of sub-target points in the distributed ray source to emit beams in sequence and causing the detector to be exposed in sequence, thereby obtaining an exposure result for each sub-target point; The sub-target point corresponding to the exposure result less than the exposure threshold among the exposure results of the multiple sub-target points is determined as the failed sub-target point.

5. The CT detection method according to claim 3, characterized in that: The acquiring information related to the failed sub-target based on the failed sub-target includes: Obtaining the sub-target sequence number of the failed sub-target; Based on the failed sub-target point, an imaging angle of the failed sub-target point relative to the detection position is determined.

6. The CT detection method according to claim 5, characterized in that: The determining, based on the information related to the failed sub-target point, of a compensation sub-target point for replacing the failed sub-target point comprises: The sub-target point corresponding to the sub-target point number preceding or following the sub-target point number of the failed sub-target point is determined as the compensation sub-target point.

7. The CT detection method according to claim 6, characterized in that: The determining the compensation imaging position and the compensation exposure position based on the compensation sub-target and the information related to the failed sub-target includes: determining the compensation imaging position based on the position of the compensation sub-target and the imaging angle; Determining a moving distance that the detector needs to move based on the compensation imaging position and the detection position; The compensated exposure position is determined based on the exposure position and the movement distance.

8. The CT detection method according to claim 3, characterized in that: The acquiring information related to the failed sub-target based on the failed sub-target includes: Obtaining the sub-target sequence number of the failed sub-target; Obtaining the distances between adjacent sub-target points in the plurality of sub-target points.

9. The CT detection method according to claim 8, characterized in that: The determining, based on the information related to the failed sub-target point, of a compensation sub-target point for replacing the failed sub-target point comprises: The sub-target point corresponding to the sub-target point number preceding or following the sub-target point number of the failed sub-target point is determined as the compensation sub-target point.

10. The CT detection method according to claim 9, characterized in that: The determining the compensation imaging position and the compensation exposure position based on the compensation sub-target and the information related to the failed sub-target includes: determining the compensation imaging position based on the detection position and the distance; The compensated exposure position is determined based on the exposure position and the spacing.

11. The CT detection method according to claim 3, characterized in that: Also includes: controlling the conveyor belt to convey the inspected object to the inspection position; Making all effective sub-targets emit beams in sequence and exposing the detectors in sequence to generate a set of multi-angle images of the object under inspection; A CT detection image of the object is reconstructed and generated based on the set of multi-angle images and the replacement image.

Images