CN213903809U - Can splice detector array and imaging system - Google Patents
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- CN213903809U CN213903809U CN202022346026.5U CN202022346026U CN213903809U CN 213903809 U CN213903809 U CN 213903809U CN 202022346026 U CN202022346026 U CN 202022346026U CN 213903809 U CN213903809 U CN 213903809U
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Abstract
The utility model discloses a can splice detector array and imaging system, the detector array includes two at least flat panel detectors, the flat panel detector includes upper cover plate, lower cover plate and sets up imaging portion and circuit board between upper cover plate and lower cover plate, the circuit board is connected with the imaging portion electricity, the imaging portion is used for converting the ray signal into the charge signal, the circuit board converts the charge signal into the digital signal; the first flat panel detector is provided with a first inclined side face which is inclined inwards from the upper cover plate to the lower cover plate, the second flat panel detector is provided with a second inclined side face which is inclined outwards from the upper cover plate to the lower cover plate, the imaging part of the second flat panel detector is provided with a flexible substrate, and the imaging part of the second flat panel detector extends to the second inclined side face from the upper cover plate; the two flat panel detectors are spliced in the forward direction, so that the imaging parts of the two flat panel detectors are arranged up and down at the spliced part of the two inclined side surfaces. The utility model discloses a detector realizes a plurality of detectors collaborative work, seamless concatenation formation of image.
Description
Technical Field
The utility model relates to a detector imaging field, in particular to detector array and imaging system can splice.
Background
Digital flat panel detectors are key components in digital X-ray imaging systems, where they convert information-bearing X-rays into digital signals that can be detected and expressed.
Most of the digital X-ray flat panel detectors on the market currently work independently, and no other cooperative work function exists between the detectors except for data transmission and sharing. The cooperative work means that under the premise of not changing the original interface and synchronization mechanism, a plurality of detectors are spliced and then work jointly, and the application end looks like operating a detector with a larger imaging area.
In order to obtain a larger imaging area, a mode of changing the position of a flat panel detector and exposing for multiple times is generally adopted in the prior art, and one-time exposure imaging cannot be realized.
SUMMERY OF THE UTILITY MODEL
In order to overcome the deficiencies in the prior art, the utility model provides a detector array and imaging system can splice, specific technical scheme is as follows:
on one hand, the detector array capable of being spliced is disclosed, and at least comprises a first flat detector and a second flat detector, wherein each of the first flat detector and the second flat detector comprises an upper cover plate, a lower cover plate, an imaging part and a circuit board, the imaging part and the circuit board are arranged between the upper cover plate and the lower cover plate, the circuit board is electrically connected with the imaging part, the imaging part is used for converting a ray signal into an electric charge signal, and the circuit board is used for converting the electric charge signal into a digital signal;
the first flat panel detector has a first inclined side surface inclined inward from the upper cover plate to the lower cover plate, the second flat panel detector has a second inclined side surface inclined outward from the upper cover plate to the lower cover plate, and the imaging portion of the second flat panel detector is disposed in a region opposite to the upper cover plate and a region opposite to the second inclined side surface;
and the first inclined side surface of the first flat panel detector is spliced with the second inclined side surface of the second flat panel detector, so that the imaging part of the first flat panel detector and the imaging part of the second flat panel detector are partially arranged up and down at the spliced part.
Further, each flat panel detector in the array has at least one first inclined side surface inclined inward from the upper cover plate to the lower cover plate and at least one second inclined side surface inclined outward from the upper cover plate to the lower cover plate.
Furthermore, the inclination angles of the first inclined side surface and the second inclined side surface on the same flat panel detector are complementary angles, and/or the inclination angles of the first inclined side surface of the first flat panel detector and the second inclined side surface of the second flat panel detector are complementary angles.
Further, the upper cover plate and the lower cover plate of the flat panel detector are both N-sided polygons, the flat panel detector further comprises N1 first oblique side surfaces and N2 second oblique side surfaces, wherein N1 and/or N2 are positive integers, N is a positive integer greater than or equal to 3, and the sum of N1 and N2 is less than or equal to N.
Further, each flat panel detector in the array is provided with contacts and/or sensors on the first oblique side and/or the second oblique side for communicating with adjacent flat panel detectors.
Further, the upper cover plate of each flat panel detector in the array is made of a material which can be penetrated by rays.
On the other hand, the detector array for three-dimensional imaging comprises a plurality of vertically arranged flat panel detectors, and light machines for emitting rays can be arranged between the adjacent flat panel detectors, so that each light machine can form an image on the opposite corresponding flat panel detector after being output.
On the other hand, the imaging system comprises a ray source, an imaging display unit and the detector array capable of being spliced, wherein rays emitted by the ray source shoot to an upper cover plate of a flat panel detector in the array, the imaging display unit is electrically connected with circuit boards of all or part of the flat panel detectors, and each flat panel detector synchronously works according to a time sequence.
In another aspect, an imaging method based on the spliceable detector array as above is disclosed, which includes the following steps:
s1, splicing a first flat panel detector and a second flat panel detector in the detector array in a forward direction, opening a ray source, and enabling the ray source to shoot to upper cover plates of the two flat panel detectors;
s2, acquiring first image information by using the first flat panel detector, and acquiring second image information by using the second flat panel detector;
s3, performing image feature matching on the first image information and the second image information to obtain a first feature matching area;
and S4, splicing the first image information with the residual part of the first feature matching area removed and the second image information, or splicing the second image information with the residual part of the first feature matching area removed and the first image information to obtain a first spliced image.
Further, after the first stitched image is obtained in step S4, the method further includes the following steps:
s5, acquiring third image information by using a third flat panel detector in the detector array, wherein the third flat panel detector is spliced with the second flat panel detector in the forward direction;
s6, performing image feature matching on the third image information and the first spliced image information to obtain a second feature matching area;
and S7, splicing the first spliced image information with the residual part of the second feature matching region removed and the third image information, or splicing the third image information with the residual part of the second feature matching region removed and the first spliced image information to obtain a second spliced image.
Further, step S3 includes: extracting feature points from the first image and the second image by using an SIFT algorithm, describing the feature points by using feature vectors, and calculating the distance between the feature vectors to realize feature matching, wherein the distance between the feature vectors is an Euclidean distance, a Hamming distance or a cosine distance.
The technical scheme of the utility model beneficial effect who brings include:
(a) the whole detector array can be used as a detector to operate and take pictures, and a plurality of flat panel detectors work together to look like operating a detector with a larger imaging area at an application end;
(b) the appropriate detector splicing mode can be flexibly selected according to the application scene, the adaptability of the system is enhanced, and the spliced detector array can increase the imaging area;
(c) the projection of the imaging area of the spliced flat panel detector is overlapped at the spliced position, and seamless splicing can be realized through image processing.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a partially enlarged schematic view of a spliceable detector array provided by an embodiment of the invention;
fig. 2 is a schematic diagram of a single-body structure of a flat panel detector according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a splicing state of three flat panel detectors spliced in a forward direction according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a detector array for three-dimensional imaging according to an embodiment of the present invention.
Wherein the reference numerals include: 1-upper cover plate, 2-imaging part, 3-circuit board, 4-support frame, 5-lower cover plate, 6-flat panel detector, 61-first flat panel detector, 611-first oblique side, 62-second flat panel detector, 621-second oblique side.
Detailed Description
In order to make the technical field person understand the present invention better, and to understand the objects, technical solutions and advantages thereof more clearly, the following embodiments of the present invention are combined with the accompanying drawings to describe the technical solutions clearly and completely. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention. In addition, the terms "comprises" and "comprising," and any variations thereof, in the description and claims of the present invention, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, product, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, product, or apparatus.
In an embodiment of the present invention, a spliceable detector array is provided, referring to fig. 1, the detector array includes at least a first flat panel detector 61 and a second flat panel detector 62, each of the first flat panel detector 61 and the second flat panel detector 62 includes an upper cover plate 1, a lower cover plate 5, and an imaging portion 2, a supporting frame 4 and a circuit board 3 disposed between the upper cover plate 1 and the lower cover plate 5, the upper cover plate 1 of each flat panel detector 6 in the array is made of a material capable of penetrating rays, which is described by taking X-rays as an example, in this embodiment, the upper cover plate 1 is made of an X-ray high-transmittance material (this is prior art); the supporting frame 4 is used for supporting the imaging part 2, the circuit board 3 is optionally mounted on the supporting frame 4, the supporting frame 4 is fixed on the inner wall of the detector in a clamping or bonding or locking manner (such as a screw, a screw or a bolt), or the supporting frame 4 can be integrally formed with the inner wall of the detector; the specific position of the circuit board 3 mounted on the supporting frame 4 is not limited, the circuit board 3 is electrically connected with the imaging part 2, the imaging part 2 is used for converting the ray signal into the charge signal, the circuit board 3 converts the charge signal into the digital signal, and the above technologies for converting the ray signal into the charge signal include, but are not limited to, an amorphous silicon indirect conversion technology or an amorphous selenium direct conversion technology;
the first flat panel detector 61 has a first inclined side surface 611 inclined inward from the upper cover plate 1 of the first flat panel detector 61 to the lower cover plate 5, the second flat panel detector 62 has a second inclined side surface 621 inclined outward from the upper cover plate 1 of the second flat panel detector 62 to the lower cover plate 5, and the inclination angles of the first inclined side surface 611 of the first flat panel detector 61 and the second inclined side surface 621 of the second flat panel detector 62 are complementary angles in this embodiment; the imaging part 2 of the second flat panel detector 62 has a flexible substrate, and because the imaging part 2 has a flexible structure, the imaging part 2 of the second flat panel detector 62 can extend from the upper cover plate 1 to the second inclined side surface 621, so that images can be formed on both a horizontal plane and an inclined plane, and obviously, at least the first inclined side surface 611 and the second inclined side surface 621 of the second flat panel detector 62 are also made of a material which can be penetrated by rays; it should be noted that, the above-mentioned imaging part 2 is a flexible structure only, in an embodiment of the present invention, the imaging part 2 of the second flat panel detector 62 may include a first portion disposed opposite to the upper cover plate 1 and a second portion disposed opposite to the second inclined side 621, and the technical solution of splicing these two portions of the above-mentioned imaging part 2 may be used as an alternative to the imaging part 2 of the flexible structure, no matter whether the imaging part 2 of the detector is a flexible structure, the present invention claims protection.
The first inclined side 611 of the first flat panel detector 61 is spliced with the second inclined side 621 of the second flat panel detector 62, so that the imaging part 2 of the first flat panel detector 61 and the imaging part 2 of the second flat panel detector 62 are partially arranged above and below the spliced position, and the "partially arranged above and below" is understood to mean that projections of the imaging part 2 of the first flat panel detector 61 and the imaging part 2 of the second flat panel detector 62 on the lower cover plate 5 at the spliced position have an overlapped part, so as to realize seamless splicing of subsequent image splicing. Meanwhile, as a pre-compensation mechanism, the thicknesses of the X-ray photon absorption material (for example, a scintillator which converts X-rays into visible light in an amorphous silicon indirect conversion technology) of the imaging portion 2 at the main plane and at the inclined plane can be adjusted, so that the sensitivities of the main plane and the inclined plane are substantially consistent, the uniformity of the images acquired at the main plane and the inclined plane is improved, and specific thickness adjustment data can be obtained through experiments.
Fig. 2 shows one of the flat panel detectors 6 in the detector array, in an embodiment of the present invention, each flat panel detector 6 in the array has at least one first inclined side 611 inclined inward from the upper cover plate 1 to the lower cover plate 5 and at least one second inclined side 621 inclined outward from the upper cover plate 1 to the lower cover plate 5, the first inclined side 611 and the second inclined side 621 on the same flat panel detector 6 are arranged to have complementary angles, and can be arranged on opposite sides as shown in fig. 2, one of the forward splicing manners of the plurality of flat panel detectors 6 is shown in fig. 3, except that the upper cover plate and the lower cover plate of the flat panel detector are both N-sided, the flat panel detector further includes N1 (integer) first inclined sides and N2 (integer) second inclined sides, where N1 and/or N2 are positive integers, that is N1 and N2 may not be zero at the same time, for example, if one flat panel detector 6 has only a first oblique side and the other flat panel detector 6 has only a second oblique side, the two flat panel detectors 6 can be spliced, and obviously, n1 and n2 may not be zero; n is the positive integer that is more than or equal to 3, and N1 is less than or equal to N with N2 sum, promptly the utility model discloses do not restrict every face and be oblique side, wherein N1 can equal with N2, also can not vary, and first oblique side 611 and second oblique side 621 on the same detector can set up in adjacent side, also can set up in non-adjacent side (not shown), the utility model discloses also do not restrict different flat panel detector in the array and have the same shape and size, for example can adopt regular octagon and square concatenation to obtain detector array (not shown).
It should be noted that, the present invention is not limited to the mutual complementary angle between the inclination angles (i.e. the included angle between the inclined side and the horizontal plane) of the first inclined side 611 and the second inclined side 621, and even if the inclination angles (i.e. the included angle between the inclined side and the horizontal plane) of the first inclined side 611 and the second inclined side 621 are not complementary, the structure should be considered to fall into the protection scope of the present invention on the premise that the portion of the second flat panel detector 62 extending to the second inclined side 621 can overlap with the projection of the imaging portion 2 of the first flat panel detector 61 in projection.
The utility model discloses an embodiment provides a detector array for three-dimensional formation of image for static CT uses the scene, as shown in FIG. 4, detector array includes a plurality of flat panel detector 6 of erectting the setting, can set up the ray apparatus that is used for sending the ray between the adjacent flat panel detector 6 for every ray apparatus is imaged on the flat panel detector 6 that corresponds opposite after the play back.
Specifically, five flat panel detectors 6 can be enclosed into a circle, a first oblique side surface 611 on any one flat panel detector 6 is spliced with a second oblique side surface 621 on an adjacent flat panel detector 6, the second oblique side surface 621 on any one flat panel detector 6 is spliced with the first oblique side surface 611 on the adjacent flat panel detector 6, as shown in fig. 4, the numbers are sequentially numbered as (i) - (v), an object to be imaged is placed in the middle area, a light machine (not shown) is arranged between every two adjacent flat panel detectors 6, an image is formed on the detector (iv) after the light machine between the detectors (i) and (ii) is finished, an image is formed on the detector (v) after the light machine between the detectors (iii) and (iv) is finished, an image is formed on the detector (iv) after the light machine between the detectors (iv) and (iv) is finished, and if all the X-ray machines emit light simultaneously, all the detectors in the three-dimensional array work cooperatively, namely synchronously picking up the image, and finally imaging on the five detectors can be used for three-dimensional reconstruction. It is to be understood that the present invention is not limited to the specific number of detectors in a three-dimensional detector array. If the X-ray machine is in a ping-pong mode, namely only one X-ray machine can emit light at a certain moment, then the X-ray machines emit light in sequence, and the detectors opposite to the light-emitting machines must collect images, in this case, other detectors do not necessarily need to work in coordination, and only collect scattered rays even if the images are collected synchronously in coordination.
In an embodiment of the present invention, an imaging system is provided, which includes a radiation source, an imaging display unit and a detector array capable of being spliced as described above, wherein the radiation emitted from the radiation source is emitted to the upper cover plate 1 of the flat panel detector 6 in the array, and the imaging display unit is electrically connected to the circuit board 3 of all or part of the flat panel detector 6; specifically, in the present embodiment, the first inclined side surface 611 and/or the second inclined side surface 621 of each flat panel detector 6 in the array is provided with a contact and/or a sensor for communicating with the adjacent flat panel detector 6, so that each flat panel detector 6 operates synchronously according to a timing sequence. Wherein the function of the physical contact and/or the sensor at least comprises the following two aspects:
firstly, the position relationship between the spliced flat panel detectors 6 can be determined to determine the splicing mode of respective imaging (the images acquired by each flat panel detector 6 can be correspondingly spliced according to the relative position of the flat panel detector 6);
secondly, the cooperative work of all the flat panel detectors 6 in the sensor array is realized, even if each flat panel detector of the detector array synchronously works according to a time sequence (short for time sequence), the synchronous time sequence of each imaging of subsequent splicing is ensured, and the imaging precision after splicing is improved.
Based on the imaging principle as described above, the imaging section 2 outputs a charge signal converted by visible light, which is converted into a digital signal by the circuit board 3 and then displayed by the imaging display unit. A central timing control unit may be provided, under the control of the central timing control unit, each of the flat panel detectors of the detector array synchronously operates according to a time sequence (for short, a time sequence), and accordingly, an image acquired by each of the flat panel detectors may be time-sequence-marked by the circuit board. In particular, the timing of the flat panel detectors of the detector array may be interacted with an external timing through the central timing control unit and a so-called single interface. In the case of a plurality of flat panel detectors cooperating, the imaging display unit may be electrically connected to the circuit board 3 of only one of the flat panel detectors 6 (which becomes the master detector) (the other flat panel detectors 6 become slave detectors, all communicating with the master detector), and obviously, may also be electrically connected to the circuit boards 3 of a plurality of or even all of the flat panel detectors 6.
The features and the splicing manner of the detectors in the detector array are as described in the above embodiments, and the structural features and the array splicing manner of the detector array in the above embodiments are incorporated into the present imaging system embodiment by way of reference, and are not described again.
It should be noted that the above electrical connections should be considered to include both wired and wireless electrical connections.
In an embodiment of the present invention, an imaging method based on the detector array capable of being spliced as described above is adopted, including the following steps:
s1, forward splicing the first flat panel detector and the second flat panel detector in the detector array (for the structure and splicing manner of the detectors, see the above embodiments, and are not described here again), and opening the radiation source, where the radiation source emits to the upper cover plates of the two flat panel detectors.
And S2, acquiring first image information by using the first flat panel detector and acquiring second image information by using the second flat panel detector.
And S3, performing image feature matching on the first image information and the second image information to obtain a first feature matching area.
Specifically, when the first flat panel detector and the second flat panel detector communicate with each other through the side physical contact or the sensor, for example, the left-right stitching positional relationship between the first flat panel detector and the second flat panel detector can be known, and accordingly, the first image information and the second image information are also stitched according to the left-right stitching positional relationship, and since the imaging areas of the respective imaging portions 2 of the first flat panel detector and the second flat panel detector overlap on the projection (see above specifically), the same image feature exists in the stitching position between the imaged first image information and the imaged second image information, the same image feature area should be a strip parallel to the oblique side of the detector, and the strip width depends on the width of the overlapping area on the projection. The image Feature matching may adopt an image recognition algorithm that is conventional in the prior art, for example, a Scale Invariant Feature Transform (SIFT) algorithm is used to extract key points (or Feature points, corner points) from an image, Feature points are described by using mathematical vectors, and distances (such as euclidean distance, hamming distance, and cosine distance) between Feature vectors are calculated to realize Feature matching.
And S4, splicing the first image information with the residual part of the first feature matching area removed and the second image information, or splicing the second image information with the residual part of the first feature matching area removed and the first image information to obtain a first spliced image.
Since the direct stitching of the first image information and the second image information may cause repeated imaging (i.e. the image of the first feature matching region existing in both the first image information and the second image information) at the stitching location, both of the above two stitching manners aim to remove an extra piece of image information, i.e. the image information of the first feature matching region, from the simply and directly stitched image.
In the above image imaging method corresponding to the splicing of two detectors, for the detector array spliced by three detectors, after the first spliced image information is obtained according to S4, the following steps may be performed:
s5, acquiring third image information by using a third flat panel detector in the detector array, wherein the third flat panel detector is spliced with the second flat panel detector in the forward direction;
s6, performing image feature matching on the third image information and the first spliced image information to obtain a second feature matching area;
and S7, splicing the first spliced image information with the residual part of the second feature matching region removed and the third image information, or splicing the third image information with the residual part of the second feature matching region removed and the first spliced image information to obtain a second spliced image, wherein the specific method for obtaining the second spliced image information is similar to S4.
For a detector array with more than four detectors spliced, similarly, the above steps may be repeated to perform feature matching (see S3) of the spliced images and the un-spliced detector images and de-double splicing (see S4). It is clear that timing synchronization of the individual detectors of the detector array is necessary, in particular in the case of non-stationary objects to be imaged, to ensure that the partial images of the individual detectors are formed at the same time.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (6)
1. The spliceable detector array is characterized by at least comprising a first flat panel detector (61) and a second flat panel detector (62), wherein each of the first flat panel detector (61) and the second flat panel detector (62) comprises an upper cover plate (1), a lower cover plate (5), an imaging part (2) and a circuit board (3), the imaging part (2) and the circuit board (3) are arranged between the upper cover plate (1) and the lower cover plate (5), the circuit board (3) is electrically connected with the imaging part (2), the imaging part (2) is used for converting a ray signal into an electric charge signal, and the circuit board (3) converts the electric charge signal into a digital signal;
the first flat panel detector (61) has a first inclined side surface (611) inclined inward from the upper cover plate (1) to the lower cover plate (5), the second flat panel detector (62) has a second inclined side surface (621) inclined outward from the upper cover plate (1) to the lower cover plate (5), and the imaging part (2) of the second flat panel detector (62) is disposed in a region opposite to the upper cover plate (1) and a region opposite to the second inclined side surface (621);
the first inclined side surface (611) of the first flat panel detector (61) is spliced with the second inclined side surface (621) of the second flat panel detector (62), so that the imaging part (2) of the first flat panel detector (61) and the imaging part (2) of the second flat panel detector (62) are partially arranged up and down at the spliced position.
2. The tileable detector array according to claim 1, characterized in that each flat panel detector (6) in the array has at least one first sloping side (611) sloping inwardly from the upper cover plate (1) towards the lower cover plate (5) and at least one second sloping side (621) sloping outwardly from the upper cover plate (1) towards the lower cover plate (5).
3. The tileable detector array according to claim 2, characterized in that the inclination angles of the first and second slanted side surfaces (611, 621) on the same flat panel detector (6) are complementary angles to each other, and/or the inclination angles of the first slanted side surface (611) of the first flat panel detector (61) and the second slanted side surface (621) of the second flat panel detector (62) are complementary angles to each other.
4. The tileable detector array according to claim 2, characterized in that the upper cover plate (1) and the lower cover plate (5) of the flat panel detector (6) are both N-sided polygons, the flat panel detector (6) further comprises N1 first oblique side surfaces (611) and N2 second oblique side surfaces (621), wherein N1 and/or N2 are positive integers, N is a positive integer greater than or equal to 3, and the sum of N1 and N2 is less than or equal to N.
5. The tileable detector array according to claim 1, characterized in that the first slanted side (611) and/or the second slanted side (621) of each flat panel detector (6) in the array is provided with contacts and/or sensors for communication with adjacent flat panel detectors (6).
6. An imaging system, characterized in that it comprises a radiation source, an imaging display unit and a detector array which can be spliced according to any one of claims 1-5, the radiation emitted by the radiation source is emitted to the upper cover plate (1) of the flat panel detectors (6) in the array, the imaging display unit is electrically connected with the circuit board (3) of all or part of the flat panel detectors (6), and each flat panel detector (6) is synchronously operated according to a time sequence.
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