CN118044831A - X-ray flat imaging device, CBCT imaging system and imaging method - Google Patents
X-ray flat imaging device, CBCT imaging system and imaging method Download PDFInfo
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- CN118044831A CN118044831A CN202410206802.1A CN202410206802A CN118044831A CN 118044831 A CN118044831 A CN 118044831A CN 202410206802 A CN202410206802 A CN 202410206802A CN 118044831 A CN118044831 A CN 118044831A
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- 238000003384 imaging method Methods 0.000 title claims abstract description 68
- 238000007408 cone-beam computed tomography Methods 0.000 title claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 47
- 239000000945 filler Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000306 component Substances 0.000 description 2
- 238000013506 data mapping Methods 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
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- 239000008358 core component Substances 0.000 description 1
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Abstract
The invention discloses an X-ray flat imaging device, a CBCT imaging system and an imaging method, comprising the following steps: the flat panel detection unit, the CT detection unit and the calibration processing circuit are arranged in parallel; the flat panel detection unit comprises a flat panel scintillator and a flat panel control circuit which are sequentially stacked from top to bottom; the CT detection unit comprises a CT scintillator and a CT control circuit which are sequentially stacked from top to bottom; the calibration processing circuit is respectively and electrically connected with the flat control circuit and the CT control circuit and is used for calibrating the data obtained by the flat control circuit according to the data obtained by the CT control circuit. The X-ray flat imaging device comprises two types of detection units, a large amount of data obtained by the flat detection units are calibrated by using a small amount of data obtained by the CT detection units, and then subsequent reconstruction processing is carried out by using the calibrated data, so that high-quality image data are obtained.
Description
Technical Field
The invention relates to a flat-panel imaging device, in particular to an X-ray flat-panel imaging device, a CBCT imaging system and an imaging method.
Background
The CBCT (Cone-Beam Computed Tomography) imaging system is shown in fig. 1, in which an X-ray source 2 and a flat panel detector 3 are fixed to both ends of a rotating gantry 1, respectively, and the X-ray source 2 irradiates divergent conical ionizing radiation onto the other side of the flat panel detector 3 through the center of a region of interest. During rotation of the gantry, the flat panel detector 3 acquires sequential planar projection images of multiple fields of view in complete or sometimes partial arcs, and the computer system performs data processing after acquiring these planar projection images to obtain the desired three-dimensional data.
The flat panel detector 3 is one of the core components of a CBCT imaging system and functions to convert invisible X-rays into electrical signals and form a digitized image. The most common flat panel detector is shown in fig. 2, in which a scintillator 4 is used to convert the attenuated X-rays transmitted through an object into visible light, an amorphous silicon photodiode array under the scintillator converts the visible light into an electric signal, stored charges are formed on the capacitance of the photodiode itself, the stored charge of each pixel is proportional to the intensity of the incident X-rays, the stored charges of each pixel are scanned and read out under the action of a photoelectric conversion and control circuit 5, and digital signals are output after a/D conversion and transmitted to a computer for image processing, so that an X-ray digital image is formed.
CBCT imaging systems use flat panel detectors as imaging elements resulting in relatively poor density resolution and imaging quality compared to conventional multi-row helical CT. The scintillator of the flat panel detector is a whole surface which is used as a whole to convert received X-ray energy into visible light, and scattering between adjacent pixels cannot be eliminated, so that the imaging quality is not as high as that of an arc detector adopting a separated scintillator, meanwhile, the thickness of the scintillator is very thin, the absorption of X-rays is not as high as that of a thick scintillator, and the final density resolution is lower than that of a conventional CT. The density resolution is the minimum density difference between the tissues under the condition of low contrast, the unit is expressed in percentage, the unit depends on the quantity of X-ray photon absorbed by each voxel, the unit is an important factor for judging the quality of CBCT images, and the higher the density resolution is, the better the capability of the system for distinguishing objects with different densities is. The image with high density resolution is more beneficial to doctors to know the morphology and the property of the focus and make accurate diagnosis on the disease position and the disease nature of patients.
Disclosure of Invention
In order to solve the technical problems, the invention provides an X-ray flat-panel imaging device, a CBCT imaging system and an imaging method.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
in a first aspect, the present invention discloses an X-ray flat panel imaging apparatus provided with a plurality of types of detection units, comprising: the flat panel detection unit, the CT detection unit and the calibration processing circuit are arranged in parallel;
The flat panel detection unit comprises a flat panel scintillator and a flat panel control circuit which are sequentially stacked from top to bottom;
The CT detection unit comprises a CT scintillator and a CT control circuit which are sequentially stacked from top to bottom;
the calibration processing circuit is respectively and electrically connected with the flat control circuit and the CT control circuit and is used for calibrating the data obtained by the flat control circuit according to the data obtained by the CT control circuit.
On the basis of the technical scheme, the following improvement can be made:
preferably, the thickness of the flat scintillator is smaller than the thickness of the CT scintillator.
As a preferred scheme, the flat panel detection unit comprises a flat panel scintillator, a flat panel control circuit and a filler which are stacked in sequence from top to bottom.
Preferably, the thickness of the flat plate detection unit is consistent with that of the CT detection unit.
Preferably, the area size of the flat plate detection unit is larger than that of the CT detection unit.
As a preferred embodiment, the CT scintillator includes: a plurality of scintillator patches distributed in an array.
In a second aspect, the present invention discloses a CBCT imaging system comprising an X-ray source and any of the X-ray flat panel imaging devices described above.
In a third aspect, the present invention discloses an imaging method of a CBCT imaging system, imaging with the CBCT imaging system, comprising:
Step S1: an X-ray source emits X-rays;
Step S2: the X-rays pass through the object, are simultaneously received by the flat panel scintillator and the CT scintillator, and are respectively converted into a first visible light signal and a second visible light signal;
Step S3: the panel control circuit converts the first visible light signal into first data;
The CT control circuit converts the second visible light signal into second data;
step S4: calibrating the first data by using the second data;
step S5: and carrying out data reconstruction by using the calibrated data and obtaining high-quality image data.
Preferably, the first data is more than the second data.
The X-ray flat imaging device, the CBCT imaging system and the imaging method have the following beneficial effects:
The X-ray flat imaging device comprises two types of detection units, a large amount of data obtained by the flat detection units are calibrated by using a small amount of data obtained by the CT detection units, and then subsequent reconstruction processing is carried out by using the calibrated data, so that high-quality image data are obtained.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a conventional CBCT imaging system.
Fig. 2 is a schematic structural view of a conventional flat panel detector.
Fig. 3 is a schematic structural diagram of an X-ray flat panel imaging device according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a CT scintillator according to an embodiment of the present invention.
Wherein: 1-rotating frame, 2-X ray source, 3-flat panel detector, 4-scintillator, 5-photoelectric conversion and control circuit;
6-flat panel detection unit, 61-flat panel scintillator, 62-flat panel control circuit, 63-filler, 7-CT detection unit, 71-CT scintillator, 72-CT control circuit.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The use of ordinal terms "first," "second," "third," etc., to describe a generic object merely denotes different instances of like objects, and is not intended to imply that the objects so described must have a given order, either temporally, spatially, in ranking, or in any other manner.
In addition, the expression "comprising" an element is an "open" expression which merely means that the corresponding component is present and should not be interpreted as excluding the additional component.
To achieve the object of the present invention, in some embodiments of an X-ray flat panel imaging device, a CBCT imaging system and an imaging method, as shown in fig. 3, the X-ray flat panel imaging device includes: a flat panel detection unit 6, a CT detection unit 7, and a calibration processing circuit (not shown in the figure) arranged in parallel;
the flat panel detection unit 6 includes a flat panel scintillator 61 and a flat panel control circuit 62 which are stacked in this order from top to bottom;
the CT detection unit 7 includes a CT scintillator 71 and a CT control circuit 72 which are stacked in this order from top to bottom;
The calibration processing circuit is electrically connected to the panel control circuit 62 and the CT control circuit 72, respectively, and is configured to calibrate the data obtained by the panel control circuit 62 according to the data obtained by the CT control circuit 72.
The flat-panel scintillator 61 is a single thin-layer integral scintillator in a conventional flat-panel detector, and the CT scintillator 71 is a thicker scintillator for CT, so that the thickness of the flat-panel scintillator 61 is smaller than that of the CT scintillator 71.
Further, in order to compensate for the difference in thickness between the flat panel detection unit 6 and the CT detection unit 7, a filler 63 is added to the inside of the flat panel detection unit 6, and the flat panel detection unit 6 includes a flat panel scintillator 61, a flat panel control circuit 62, and the filler 63, which are stacked in this order from top to bottom. The thickness of the flat plate detection unit 6 and the CT detection unit 7 are consistent, and a flat plate shape is formed.
Further, in order to save costs, the area size of the flat panel detection unit 6 is larger than that of the CT detection unit 7.
Further, the CT scintillator 71 is not a monolith, but is formed of a plurality of scintillator tiles distributed in a horizontal-vertical array, as shown in FIG. 4. By adopting the arrangement mode, the mutual interference between adjacent scintillators can be reduced.
The embodiment of the invention also discloses a CBCT imaging system which comprises an X-ray source and the X-ray flat-plate imaging device.
The embodiment of the invention also discloses an imaging method of the CBCT imaging system, which uses the CBCT imaging system for imaging and comprises the following steps:
Step S1: an X-ray source emits X-rays;
Step S2: the X-rays pass through the object, are simultaneously received by the flat panel scintillator 61 and the CT scintillator 71, and are respectively converted into a first visible light signal and a second visible light signal;
Step S3: the panel control circuit 62 converts the first visible light signal into first data;
The CT control circuit 72 converts the second visible light signal into second data;
The first data is more than the second data;
step S4: calibrating the first data by using the second data;
step S5: and carrying out data reconstruction by using the calibrated data and obtaining high-quality image data.
Specifically, before an imaging method is executed, a part of a human body is selected;
Then, adopting a CT detector unit to acquire data and record the data as data a, and adopting a flat panel detection unit to acquire data and record the data as data b;
And finally, deducing the data mapping relation or conversion relation of the CT detector unit and the flat panel detector unit on the same part by adopting the data difference between the data a and the data b.
When the imaging method is executed, after the first data and the second data are acquired, the second data are utilized to calibrate the first data according to the data mapping relation or the conversion relation acquired in advance, namely: based on the second data, the first data obtained by the flat panel detector unit is converted or mapped into data obtained by using a conventional CT detector, and then subsequent data imaging processing of the conventional CT is carried out, so that the goal of achieving the imaging quality of the conventional CT detector by using the flat panel detector can be realized.
The X-ray flat imaging device, the CBCT imaging system and the imaging method have the following beneficial effects:
The X-ray flat imaging device comprises two types of detection units, a large amount of data obtained by the flat detection units are calibrated by using a small amount of data obtained by the CT detection units, and then subsequent reconstruction processing is carried out by using the calibrated data, so that high-quality image data are obtained.
The invention can achieve the quality of the conventional CT image only by improving the traditional CBCT imaging system.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, but not limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (9)
- An x-ray flat panel imaging apparatus, comprising: the flat panel detection unit, the CT detection unit and the calibration processing circuit are arranged in parallel;The flat panel detection unit comprises a flat panel scintillator and a flat panel control circuit which are sequentially stacked from top to bottom;The CT detection unit comprises a CT scintillator and a CT control circuit which are sequentially stacked from top to bottom;The calibration processing circuit is respectively and electrically connected with the flat control circuit and the CT control circuit and is used for calibrating the data obtained by the flat control circuit according to the data obtained by the CT control circuit.
- 2. The X-ray flat panel imaging device of claim 1, wherein the thickness of the flat panel scintillator is less than the thickness of the CT scintillator.
- 3. The X-ray flat panel imaging apparatus according to claim 2, wherein the flat panel detection unit includes a flat panel scintillator, a flat panel control circuit, and a filler, which are stacked in this order from top to bottom.
- 4. The X-ray flat panel imaging apparatus according to claim 3, wherein a thickness of the flat panel detection unit is identical to a thickness of the CT detection unit.
- 5. The X-ray flat panel imaging apparatus according to any of claims 1-4, wherein the area size of the flat panel detection unit is larger than the area size of the CT detection unit.
- 6. The X-ray flat panel imaging device of any of claims 1-4, wherein the CT scintillator comprises: a plurality of scintillator patches distributed in an array.
- A cbct imaging system, comprising: an X-ray source and an X-ray flat panel imaging device as claimed in any one of claims 1-6.
- A method of imaging a CBCT imaging system, wherein imaging with the CBCT imaging system of claim 7, comprises:Step S1: an X-ray source emits X-rays;Step S2: the X-rays pass through the object, are simultaneously received by the flat panel scintillator and the CT scintillator, and are respectively converted into a first visible light signal and a second visible light signal;Step S3: the panel control circuit converts the first visible light signal into first data;The CT control circuit converts the second visible light signal into second data;step S4: calibrating the first data by using the second data;step S5: and carrying out data reconstruction by using the calibrated data and obtaining high-quality image data.
- 9. The imaging method of claim 8, wherein the first data is more than the second data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410206802.1A CN118044831A (en) | 2024-02-26 | 2024-02-26 | X-ray flat imaging device, CBCT imaging system and imaging method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410206802.1A CN118044831A (en) | 2024-02-26 | 2024-02-26 | X-ray flat imaging device, CBCT imaging system and imaging method |
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