CN209674014U - CT system and detection device for CT system - Google Patents

Abstract

The utility model discloses a CT system and a detection device used for the CT system. The device includes: a high-energy detector assembly, the high-energy detector assembly includes multiple rows of high-energy detectors arranged along a predetermined track; There are multiple rows of low-energy detectors; wherein, the number of rows of low-energy detectors is less than the number of rows of high-energy detectors; each row of low-energy detectors covers a row of high-energy detectors. According to the CT system and the detection device used in the CT system provided by the embodiment of the utility model, the ability to distinguish materials is improved.

Description

CT system and detection device for CT system

technical field

The utility model relates to the field of radiation detection, in particular to a CT system and a detection device for the CT system.

Background technique

At present, computed tomography technology based on radiography is widely used in security checks, especially for checking suspicious items in luggage. In the CT technology based on radiography, the characteristic distribution data of the scanned object in the fault can be obtained through CT data reconstruction, and the common suspect substances in luggage can be identified by analyzing the characteristic data.

At present, the commonly used dual-energy CT system adopts a double-layer detector structure to obtain dual-energy projection data to distinguish the detected object. However, the double-layer detector structure in the current CT system can only provide dual-energy projection data at most, which limits the ability to distinguish materials.

Utility model content

Embodiments of the utility model provide a CT system and a detection device for the CT system, which improve the ability to distinguish materials by using multi-energy projection data.

According to an aspect of an embodiment of the present invention, a detection device for a CT system is provided, the device includes:

A high-energy detector assembly, the high-energy detector assembly includes multiple rows of high-energy detectors arranged along a predetermined track;

The low-energy detector assembly is stacked with the high-energy detector assembly, and the low-energy detector assembly includes multiple rows of low-energy detectors arranged at intervals along a predetermined track;

Wherein, the number of rows of low-energy detectors is less than the number of rows of high-energy detectors;

Each row of low-energy detectors covers a row of high-energy detectors.

In one embodiment, any two adjacent rows of high-energy detectors are closely arranged.

In one embodiment, multiple rows of high-energy detectors are arranged at intervals along a predetermined track.

In one embodiment, there is a first preset distance between any two adjacent rows of high-energy detectors.

In one embodiment, at least one row of high-energy detectors not covered by low-energy detectors is arranged between any two adjacent rows of high-energy detectors covered by low-energy detectors.

In one embodiment, the high-energy detectors covered by the low-energy detectors and the high-energy detectors not covered by the low-energy detectors are alternately arranged in a predetermined track.

In one embodiment, there is a second preset distance between any two adjacent rows of low-energy detectors.

In one embodiment, the second preset distance is 5 to 80 mm; or,

The second preset distance is 30 to 50 mm.

In one embodiment, the predetermined trajectory is a circular arc.

According to another aspect of the embodiment of the present utility model, a detection device for a CT system is provided, the device includes:

The first layer of detector components, the second layer of detector components, ..., the Nth layer of detector components that are stacked, N is an integer greater than 2;

Wherein, the first layer of detector assembly includes multiple rows of first detectors arranged along a predetermined track, the second layer of detector assembly includes multiple rows of second detectors arranged at intervals along a predetermined track, ..., the Nth layer of detection The detector assembly includes a plurality of rows of Nth detectors arranged at intervals along a predetermined track;

The energy corresponding to the energy response peak value of the first detector, the energy corresponding to the energy response peak value of the second detector, ..., the energy corresponding to the energy response peak value of the Nth detector decrease in turn;

The number of rows of detectors in the k+1th layer detector assembly is less than the number of rows of detectors in the kth layer detector assembly, k=1, 2, ... N-1;

Each row of detectors in the k+1th layer of detector assemblies covers a row of detectors in the kth layer of detector assemblies.

According to still another aspect of the embodiment of the present utility model, a CT system is provided, the system includes:

The scanning channel is used for the object to be inspected to enter and exit the CT system;

Slip ring for rotation around the scanning channel;

a radiation source connected to the slip ring; and

A detection device arranged opposite to the ray source and connected to the slip ring, the detection device is the device provided by the embodiment of the present invention.

In one embodiment, the CT system further includes: a data processing module, configured to reconstruct a CT image of the inspected object based on the data signal output by the detection device.

According to the CT system and the detection device used in the CT system in the embodiment of the present invention, the detection device includes a high-energy detector assembly and a low-energy detector assembly stacked with the high-energy detector assembly, and the high-energy detector assembly includes The low-energy detector assembly includes multiple rows of low-energy detectors arranged at intervals along the predetermined track, because the number of rows of low-energy detectors is smaller than the number of rows of high-energy detectors, and each row of low-energy detectors covers A row of high-energy detectors, so the rays emitted by the ray source can have three ways of penetrating the detection device, so that three-energy projection images can be obtained, and the resolution of the material is improved.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings used in the embodiments of the present invention. , and other drawings can also be obtained from these drawings.

Fig. 1 shows a schematic structural diagram of a CT system provided by some embodiments of the present invention;

Fig. 2 shows an exemplary structural diagram of a detection device for a CT system provided by an embodiment of the present invention;

Figure 3 shows a schematic structural view of a single row of detectors provided by some embodiments of the present invention;

Figure 4 shows a side view of the detection device in Figure 2;

Fig. 5 shows the energy response curve of low-energy detector and high-energy detector in detection device among Fig. 2;

Fig. 6 shows a side view of a detection device provided by another embodiment of the present invention;

Fig. 7 shows a side view of a detection device provided by another embodiment of the present invention.

Detailed ways

The characteristics and exemplary embodiments of various aspects of the utility model will be described in detail below. In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only configured to explain the present utility model, and are not configured to limit the present utility model. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by showing examples of the present invention.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. any such actual relationship or order exists between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the statement "comprising..." does not exclude the presence of additional same elements in the process, method, article or device comprising said element.

In order to better understand the utility model, the CT system and the detection device for the CT system according to the embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings. It should be noted that these embodiments are not intended to limit the disclosure of the utility model range.

Fig. 1 shows a schematic structural diagram of a CT system provided by an embodiment of the present invention. As shown in FIG. 1 , the CT system includes: a scanning channel 1 , a radiation source 2 , a detection device 3 , a slip ring 4 , a control device 5 and a data processing device 6 .

In the embodiment of the present invention, the inspected object enters and exits the CT system through the scanning channel 1 along the conveying direction V.

The ray source 2 is connected with the slip ring and is used for emitting ray beams. The ray source 2 can be various commonly used X-ray machines, accelerators, or devices capable of emitting X-rays or γ-rays, such as radioisotopes and synchrotron radiation sources.

The detection device 3 is arranged opposite to the radiation source 2 , and the detection device 3 is connected to the slip ring 4 . The detection device 3 receives the ray beam emitted by the ray source 2 and passes through the object to be inspected.

The slip ring 4 rotates around the scanning channel 1 . Wherein, the rotation axis of the slip ring 4 is approximately parallel to the conveying direction V in which the object to be inspected is conveyed by the scanning channel 1 . The slip ring 4 rotates according to preset scanning parameters, so as to drive the radiation source 2 and the detection device 3 to rotate around the inspected object, thereby completing the rotational scanning of the inspected object.

The control device 5 controls the radiation emission of the ray source 2 and controls the collection of data signals output by the detection device 3 . Moreover, the control device 5 is also used to control the actions of the scanning channel 1 and the slip ring 4 .

The data processing device 6 performs processing based on the data signal generated by the detection device 3 during the scanning of the object to be inspected, so as to reconstruct the CT image of the object to be inspected.

Fig. 2 shows a schematic structural diagram of a detection device 3 provided by an embodiment of the present invention. With reference to Fig. 2, detection device 3 comprises:

A high-energy detector assembly 31, the high-energy detector assembly 31 includes multiple rows of high-energy detectors 311 arranged along predetermined tracks.

The low-energy detector assembly 32 is stacked with the high-energy detector assembly 31 , and the low-energy detector assembly 32 includes multiple rows of low-energy detectors 321 arranged at intervals along a predetermined track.

Wherein, the low-energy detector assembly 32 is arranged on the side close to the radiation source 2 , and the high-energy detector assembly 31 is arranged on the side away from the radiation source 2 . That is to say, the radiation emitted by the radiation source 2 enters the low-energy detector 321 first.

Continuing to refer to FIG. 2 , the high-energy detector assembly 31 includes surface array high-energy detectors 311 arranged along the arc track N shown by the dotted line with arrows in FIG. 2 . Wherein, the high-energy detectors of the area array include multiple rows of high-energy detectors 311, and any two adjacent rows of high-energy detectors 311 are closely arranged. In other words, the distance between any two adjacent rows of high-energy detectors 311 approaches zero infinitely. Optionally, the centers of each high-energy detection unit of the area array may be distributed on a circular arc centered on the focus of the ray source 2 .

Optionally, the predetermined track arranged by the multiple rows of high-energy detectors is a straight line parallel to the conveying direction V.

Fig. 3 shows a schematic structural diagram of a single row of detectors provided by an embodiment of the present invention. The single row of detectors here may be a single row of low-energy detectors or a single row of high-energy detectors. As shown in Figure 3, a single-row detector is formed by arranging multiple detection units according to a predetermined track. Wherein, each detection unit independently outputs a piece of data. Optionally, multiple detection units may be arranged continuously or at intervals.

In an embodiment of the present invention, each row of high-energy detectors includes a plurality of high-energy detection units arranged in predetermined tracks. Referring to FIG. 2 , a plurality of high-energy detection units are arranged along the arc track M in FIG. 2 . Optionally, multiple high-energy detection units in each row of high-energy detectors may be arranged in a straight line.

In an embodiment of the present invention, the arrangement trajectory of the high-energy detection units in the high-energy detector may be a straight line approximately parallel to the conveying direction V of the scanning channel. That is to say, a plurality of high-energy detection units are arranged according to the conveying direction of the scanning channel. The arrangement trajectory of the high-energy detection units in the high-energy detector can also be a circular arc with the focal point of the ray source as the center.

In an embodiment of the present invention, the low-energy detector assembly 32 includes a plurality of rows of low-energy detectors 321 arranged at intervals according to the arc track N in FIG. 2 . Optionally, the distance between two adjacent low-energy detectors 321 may be equal or unequal.

Optionally, the distance between every two adjacent rows of low-energy detectors is equal. The distance between the low energy detectors 31 may be 5 to 80 mm, 10 to 70 mm, 20 to 60 mm, 30 to 50 mm, 35 to 45 mm, 36 to 40 mm, or 38 mm. Specifically, it can be set according to the requirements of the inspected object.

Wherein, each row of low-energy detectors includes a plurality of low-energy detection units arranged according to predetermined tracks. Referring to FIG. 2 , multiple low-energy detection units in each row of low-energy detectors are also arranged along the arc track in FIG. 2 . Optionally, multiple low-energy detectors in each row of low-energy detectors may also be arranged in a straight line parallel to the conveying direction V.

In an embodiment of the present invention, the number of rows of low-energy detectors 321 is smaller than the number of rows of high-energy detectors 311 , and each row of low-energy detectors 321 covers a row of high-energy detectors 321 . Since the number of rows of low-energy detectors 321 is smaller than that of high-energy detectors 321, the high-energy detector assembly includes high-energy detectors covered by low-energy detectors and high-energy detectors not covered by low-energy detectors.

FIG. 4 shows a side view of the detection device in FIG. 2 . FIG. 5 shows the energy response curves of the low energy detector and the high energy detector in FIG. 2 . As shown in FIG. 4, in the process of using the CT system, by using the detection device in FIG. 2, the X-rays emitted by the ray source 1 have three ways of penetrating the detection device: X-rays directly enter the low-energy detector 321 and deposit, The X-rays passing through the low-energy detector 321 enter the high-energy detector covered by the low-energy detector for deposition, and the X-rays directly enter the high-energy detector not covered by the low-energy detector and deposit.

Wherein, because the number of rows of low-energy detectors 321 is less than the number of rows of high-energy detectors 311, high-energy detectors that are not covered by low-energy detectors are included in the high-energy detector assembly, so that X-rays can be directly deposited on areas that are not detected by low-energy detectors. High-energy detectors covered by detectors.

Since each row of low-energy detectors 321 covers a row of high-energy detectors 321, the rays penetrating the low-energy detectors can be deposited on the high-energy detectors covered by the low-energy detectors.

As shown in Figure 5, the solid line represents the first energy response curve of the low-energy detector, the dotted line represents the second energy response curve of the high-energy detector covered by the low-energy detector, and the dotted line represents the energy response curve not covered by the low-energy detector. The third energy response curve of the high energy detector covered by the detector.

Referring to FIG. 4 and FIG. 5 , after X-rays are deposited on the low-energy detector, the first energy response of the low-energy detector 321 is more significant in the low-energy section.

When X-rays are directly deposited on the high-energy detector not covered by the low-energy detector, the third energy response of the high-energy detector not covered by the low-energy detector is more significant in the high-energy segment.

When X-rays penetrate the low-energy detector and deposit on the high-energy detector covered by the low-energy detector, the high-energy detector covered by the low-energy detector has a second energy response different from the first energy response, and the second energy response is the first The product of the energy response and the third energy response. Referring to FIG. 5 , the second energy response is more significant in the intermediate energy segment between the low energy segment and the high energy segment.

Continuing to refer to Figure 5, for the three types of detectors: low-energy detectors, high-energy detectors covered by low-energy detectors, and high-energy detectors not covered by low-energy detectors, the energy of the photon with the largest proportion deposited in each type of detector different.

That is to say, the energy corresponding to the peak value of the first energy response of the low-energy detector, the energy corresponding to the peak value of the second energy response of the high-energy detector covered by the low-energy detector, and the energy corresponding to the peak value of the second energy response of the high-energy detector not covered by the low-energy detector. The energy corresponding to the peak value of the three energy responses increases sequentially.

Therefore, the CT system using the detector device provided by the embodiment of the present invention can acquire the three-energy projection data of the inspected object. Compared with the dual-energy projection image, the triple-energy projection image can more accurately describe the attenuation coefficient function of the scanned material, thus having a stronger material resolution capability.

In the embodiment of the present utility model, no other devices are arranged between the low-energy detector assembly and the high-energy detector assembly, in order to realize that the radiation emitted by the ray source can be directly deposited on the high-energy detector not covered by the low-energy detector, and realize It is deposited on the high-energy detector covered by the low-energy detector, so as to realize the use of two-layer detector components to obtain three-energy projection data, so as to improve the resolution ability of materials.

As an example, for two different materials A and B, there is a K-edge jump in the attenuation coefficient function of material A, but there is no K-edge jump in the attenuation coefficient function of material B, but it is generally consistent with material A The attenuation coefficient function is similar. where K-edge is the binding energy of electrons in the K-shell of an atom. When the photon energy exceeds the K-edge, the photoelectric effect will occur when the K-layer electrons of the atom interact with the photon, and the attenuation coefficient function of the atom will undergo a jump.

Due to the obvious energy broadening of the X-ray energy spectrum, the attenuation coefficient of material A reconstructed from the dual-energy projection data is an average of the attenuation coefficient function of material A on the X-ray energy spectrum, that is, the equivalent attenuation coefficient, which It is very close to the equivalent attenuation coefficient of the reconstructed material B, that is, material A and material B cannot be distinguished from the dual-energy projection data.

The detection device provided by the embodiment of the utility model can provide three-energy projection data, and the three-energy projection data can provide equivalent attenuation coefficients under three different energy spectra. Compared with the dual-energy equivalent attenuation coefficient, there is more one-dimensional data It is used to reflect whether the K-edge jump exists, so that material A and material B can be distinguished, that is, the ability to distinguish materials is improved.

In the embodiment of the present utility model, the low-energy detector assembly 32 is arranged on the side close to the radiation source 2, and the high-energy detector assembly 31 is not arranged on the side close to the radiation source 2, in order to realize the radiation emitted by the radiation source. The rays can penetrate the low-energy detector assembly, thereby entering the high-energy detector covered by the low-energy detector, and then obtain projection data with a second energy response.

If the high-energy detector assembly 31 is arranged on the side close to the radiation source 2 and the low-energy detector assembly 32 is arranged on the side away from the radiation source 2, the three-energy projection data cannot be obtained. Generally, the thickness of the high-energy detector is relatively large, so all photons in the ray will all be deposited in the high-energy detector. If the high-energy detector assembly 31 is arranged on the side close to the ray source 2, no photons will enter the low-energy detector covered by the high-energy detector, so only dual-energy projection data can be obtained.

The detection crystal in the high-energy detector is generally thicker, so the high-energy detector assembly arranged on the side away from the ray source 2 can completely absorb the X-ray photons emitted by the ray source, so the detection efficiency of the detection device in the embodiment of the present invention is high. , The image noise is small and the penetrating power is strong.

In an embodiment of the invention, the high energy detectors covered by the low energy detectors have a second energy response, and the high energy detectors not covered by the low energy detectors have a third energy response. In order to further improve the image quality of the inspected object and improve the uniformity and accuracy of the projection data with the third energy response in the high-energy detector assembly, the high-energy detection unit in the high-energy detector assembly can be calibrated or calibrated.

As an example, first obtain the first data respectively output by multiple high-energy detection units in the high-energy detector when it is not covered by the low-energy detector; then cover the low-energy detector on the high-energy detector to obtain , the second data respectively output by the multiple high-energy detection units in the high-energy detector, and the third data respectively output by the multiple low-energy detection units in the low-energy detector. Then, according to the plurality of first data, the plurality of second data and the plurality of third data, the relationship between the first data and the second data and the third data is established.

As a specific example, the first data is used as an independent variable, the second data and the third data are used as dependent variables, and the relationship between the first data, the second data, and the third data is established, so as to find out when the second data and the third data are used. When the third data is weighted and summed to estimate the first data, the weight corresponding to the second data and the weight corresponding to the third data.

For each high-energy detection unit in the high-energy detector covered by the low-energy detector in the detection device, according to the weight of the pre-calibrated second data and the weight of the third data, it will cover the third part of the low-energy detection unit of the high-energy detection unit The data and the second data of the high-energy detection unit are weighted and summed to estimate the estimated projection data of each high-energy detection unit in the high-energy detector covered by the low-energy detector when it is not covered by the low-energy detector.

Then, the estimated projection data corresponding to each high-energy detection unit in the high-energy detector covered by the low-energy detector is combined with the projection data output by the high-energy detection unit in the other high-energy detectors not covered by the low-energy detector, so that Constitute the projection data of the high-energy detector with only the third energy response, and then give the single-energy three-dimensional reconstruction result of the inspected object.

By improving the consistency of the output data of the high-energy detector in the high-energy detector assembly, more data of the inspected object can be obtained, and the uniformity of the data and the image quality are improved, thereby further improving the resolution of the material.

Fig. 6 shows a side view of a detection device provided by another embodiment of the present invention. The detection device shown in Figure 6 differs from the detection device shown in Figure 2 in that:

Multiple rows of high-energy detectors in the high-energy detector assembly are arranged at intervals along predetermined tracks.

Wherein, the distance between any two rows of high-energy detectors may be equal or unequal. Optionally, in order to maintain the spatial uniformity and image quality of the data output by the high-energy detectors, the distance between any two adjacent rows of high-energy detectors can be equal.

In the embodiment of the present invention, if the spacing between every two adjacent rows of low-energy detectors is equal, and the spacing between every adjacent two rows of high-energy detectors is also equal, in order to ensure that the high-energy detector components include If the high-energy detectors are covered by the low-energy detectors, the row spacing of the low-energy detectors is greater than the row spacing of the high-energy detectors.

In the embodiment of the present invention, in order to maintain data uniformity and image quality, at least one row of high-energy detectors not covered by low-energy detectors is arranged between any two adjacent rows of high-energy detectors covered by low-energy detectors. device.

Specifically, the high-energy detectors covered by the low-energy detectors are arranged alternately with the high-energy detectors not covered by the low-energy detectors according to a predetermined track, so as to ensure the projection data with the second energy response and the projection data with the third energy response Uniform distribution, thereby improving the image quality of the detected object to further improve the ability to distinguish materials.

The embodiment of the utility model also provides a detection device, which includes:

The first layer of detector components, the second layer of detector components, .

Wherein, the first layer of detector assembly includes multiple rows of first detectors arranged along a predetermined track, the second layer of detector assembly includes multiple rows of second detectors arranged at intervals along a predetermined track, ..., the Nth layer of detection The detector assembly includes a plurality of rows of Nth detectors arranged at intervals along a predetermined track.

The energy corresponding to the energy response peak value of the first detector, the energy corresponding to the energy response peak value of the second detector, ..., the energy corresponding to the energy response peak value of the Nth detector decrease in turn;

The number of rows of detectors in the detector assembly of the k+1th layer is smaller than the number of rows of detectors in the detector assembly of the kth layer, k=1, 2, ... N-1.

Each row of detectors in the k+1th layer of detector assemblies covers a row of detectors in the kth layer of detector assemblies.

As an example, FIG. 7 shows a side view of the detection device when N=3. By arranging the multi-layer detector assembly, the four-energy or more multi-energy projection data of the inspected object can be obtained, thereby further improving the resolution of the material.

The detection device comprising three or more layers of detector components according to the embodiment of the present invention is similar to the detection device comprising two layers of detector components in connection with FIGS. 2 to 6 , and will not be repeated here.

The above is only a specific embodiment of the utility model, but the scope of protection of the utility model is not limited thereto, and any person familiar with the technical field can easily think of various Equivalent modifications or replacements shall all fall within the protection scope of the present utility model.

Claims (12)

1. a kind of detection device for CT system, which is characterized in that described device includes:

High energy detector component, the high energy detector component include multiple rows of high energy detector along desired trajectory arrangement；

Low energy detector assembly is stacked with the high energy detector component, and the low energy detector assembly includes along described Multiple rows of low energy detector that desired trajectory is intervally arranged；

Wherein, the number of rows of the low energy detector is less than the number of rows of the high energy detector；

Low energy detector described in every row covers high energy detector described in a row.

2. device according to claim 1, which is characterized in that the two rows of high energy detectors of arbitrary neighborhood are closely arranged.

3. device according to claim 1, which is characterized in that multiple rows of high energy detector is arranged along the desired trajectory interval Cloth.

4. the apparatus according to claim 1, which is characterized in that all had between the two rows of high energy detectors of arbitrary neighborhood First default spacing.

5. the apparatus according to claim 1, which is characterized in that the arbitrary neighborhood two rows institute covered by the low energy detector It states between high energy detector, is provided with the high energy detector that an at least row is not covered by the low energy detector.

6. the apparatus according to claim 1, which is characterized in that the high energy covered by the low energy detector detects Device is arranged alternately with the high energy detector not by low energy detector covering by the desired trajectory.

7. the apparatus according to claim 1, which is characterized in that all had between the two rows of low energy detectors of arbitrary neighborhood Second default spacing.

8. device according to claim 7, which is characterized in that the second default spacing is 5 to 80 millimeters；Or,

The second default spacing is 30 to 50 millimeters.

9. the apparatus according to claim 1, which is characterized in that the desired trajectory is circular arc.

10. a kind of detection device for CT system, which is characterized in that described device includes:

The first layer detector assembly that is stacked, second layer detector assembly ..., n-th layer detector assembly, the N is Integer greater than 2；

Wherein, the first layer detector assembly includes multiple rows of first detector along desired trajectory arrangement, and the second layer is visited Surveying device assembly includes multiple rows of second detector ... ... being intervally arranged along the desired trajectory, the n-th layer detector assembly packet Include the multiple rows of N detector being intervally arranged along the desired trajectory；

The corresponding energy of energy response peak value, the energy response peak value of second detector of first detector are corresponding Energy ..., the corresponding energy of energy response peak value of the N detector is sequentially reduced；

Number of rows of the number of rows of detector less than detector in kth Layer Detection device assembly in+1 Layer Detection device assembly of kth, k=1, 2 ... ... N-1；

Every row's detector in+1 Layer Detection device assembly of kth covers the detection of the row in the kth Layer Detection device assembly Device.

11. a kind of CT system, which is characterized in that the system comprises:

Scanning channel passes in and out the CT system for inspected object；

Slip ring, for being rotated around the scanning channel；

The radiographic source being connect with the slip ring；And

The detection device for being oppositely arranged and being connected on the slip ring with the radiographic source, the detection device are such as claim Device described in 1-10 any one.

12. system according to claim 11, which is characterized in that the system also includes:

Data processing module, the data-signal for being exported based on the detection device rebuild the CT figure of the inspected object Picture.