CN113114959A

CN113114959A - X-ray imaging method based on part prejudgment, control device and storage medium

Info

Publication number: CN113114959A
Application number: CN202110208948.6A
Authority: CN
Inventors: 范奇威; 马扬喜; 李煦; 张楠
Original assignee: Shanghai Yirui Optoelectronics Technology Co ltd
Current assignee: Shanghai Yirui Optoelectronics Technology Co ltd
Priority date: 2021-02-24
Filing date: 2021-02-24
Publication date: 2021-07-13

Abstract

The invention provides an X-ray flat panel detector imaging method based on position prejudgment, a control device and a storage medium, wherein the imaging method comprises the following steps: providing an object to be shot; exposing an object to be shot with a preset dose to obtain a pre-judging image; obtaining a target image and a target dosage of a target part based on the pre-judging image; and exposing the object to be shot with target dose to obtain a required image. The invention can analyze and prejudge the target part by exposing with the preset dose, further adjust the radiation dose of the target part on the basis, and correspondingly adjust the PGA change sensitivity, thereby flexibly adjusting the proper radiation dose aiming at the target part, and further reducing the shooting dose to achieve the ideal shooting effect. The method of the invention can reduce the loss of the ray source, prolong the service life and save the cost without changing the hardware design.

Description

X-ray imaging method based on part prejudgment, control device and storage medium

Technical Field

The invention belongs to the technical field of flat panel detector imaging, and particularly relates to an X-ray flat panel detector imaging method based on position prejudgment, a control device and a storage medium.

Background

X-rays have the ability to penetrate substances, but their penetrating abilities are different for different substances; capable of ionizing molecules or atoms; has cell destroying effect, and different tissues of human body have different sensitivities to X-ray and different damage degrees. Thus, X-rays can image the human body on a screen or film based on differences in density and thickness of human tissue. In the digital Radiography (CR), an image plate is used to record X-rays instead of a conventional film/intensifying screen, and then a laser is used to excite the image plate, and digital signals stored in the image plate are read out by a dedicated readout device and then processed and imaged by a computer; in the Direct Digital Radiography (DR) technology, a detector of the DR technology can quickly convert a detected X-ray signal into a digital signal directly for output.

At present, in the clinical shooting process, a single X-ray image can only shoot a certain part of a body through a fixed dose, and the imaging part is limited, for example, the high dose is only suitable for shooting high-density body tissues, and the low dose is only suitable for shooting low-density body tissues. As a result, many patients may receive excessive or insufficient doses when they take different parts of the body, and as a result, some detailed parts may be imaged incompletely or over-exposed, and some organs that require a doctor to look specifically at may be imaged less clearly at a fixed dose or masked by an excessive dose, and the proper dose cannot be adjusted for a particular organ to take and image. For example, in a certain fixed dose, some parts are clearly visible, some parts are exposed or cannot be well penetrated and imaged on the same imaging picture. Therefore, the target organ to be observed is imaged at a fixed dose in the shooting process, which causes a problem of unclear resolution, and further causes repeated imaging at different doses, which not only increases the diagnosis cost, but also causes the patient to be exposed in the X-ray environment for a long time, which may cause harm to human health.

Therefore, it is necessary to provide an imaging method, a control device and a storage medium for an X-ray flat panel detector based on region prediction to solve the above-mentioned problems in the prior art.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention provides an imaging method, a control device and a storage medium for an X-ray flat panel detector based on region prediction, which are used to solve the problems in the prior art that it is difficult to obtain a desired image effect in fixed dose imaging, and it is not possible to adjust an appropriate dose for a specific organ to capture and image.

In order to achieve the above and other related objects, the present invention provides an X-ray flat panel detector imaging method based on region prediction, including the steps of:

providing an object to be shot;

exposing the object to be shot with a preset dose to obtain a pre-judging image, wherein the pre-judging image comprises a plurality of different image sub-areas, and the image sub-areas are shot images at different positions;

comparing the image sub-regions to obtain a target image of a target part to be observed, and obtaining a target dosage required by shooting the target part;

and exposing the object to be shot with the target dose to obtain a required image.

Optionally, the method further includes, after obtaining the pre-determined image: and adjusting the FPGA parameters of the flat panel detector to change the sensitivity of the flat panel detector so as to reduce the target dose.

Optionally, adjusting the FPGA parameter includes adjusting a capacitance to improve a sensitivity of the flat panel detector.

Optionally, the target image is judged based on the X-ray transmittance of each of the image sub-regions.

Optionally, a feature of the target portion is determined based on the size and X-ray transmittance of the target image to determine the target dose based on the obtained feature, wherein the feature includes an age of the object to be photographed.

Optionally, the step of correcting the desired image to obtain a display image is further included after obtaining the desired image, and the correction manner includes at least one of background correction and gain correction.

Optionally, when the object to be photographed is a human body, the image sub-regions include a chest image region, a shoulder image region, an abdomen image region, a waist image region, a lung image region, and a crotch image region.

Optionally, the preset dose setting manner includes: the preset dose is selected to be between 1/15-1/5 of the clinical dose.

In addition, the present invention also provides a control device including:

at least one processor; and

a memory communicatively coupled to the processor; wherein the content of the first and second substances,

the memory is used for storing a computer program, and the processor is used for executing the computer program stored by the memory so as to cause the control device to execute the imaging method according to any one of the schemes.

Furthermore, the present invention also provides a storage medium having stored thereon a computer program to be executed by a processor to implement the imaging method according to any one of the above aspects.

Compared with the prior art, the imaging method, the control device and the storage medium of the X-ray flat panel detector based on the position prejudgment can analyze and prejudge the target position by exposing with the preset dose, further adjust the radiation dose of the target position on the basis, and correspondingly adjust the PGA to change the sensitivity, so that the proper radiation dose can be flexibly adjusted aiming at the target position, and the shooting dose can be further reduced to achieve the ideal shooting effect. The method of the invention can reduce the loss of the ray source, prolong the service life and save the cost without changing the hardware design.

Drawings

Fig. 1 is a schematic diagram of a prediction image obtained in an example of the imaging method based on region prediction according to the present invention.

Fig. 2 is a flowchart illustrating steps of an exemplary method for imaging based on region prediction according to the present invention.

Fig. 3 is a diagram illustrating an integrated module for image pre-judging and collecting in an embodiment of the imaging method based on the region pre-judging of the present invention.

Description of the element reference numerals

100 prejudged image

101. 102, 103, 104, 105, 106, 107 image sub-regions

S1-S4

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.

As in the detailed description of the embodiments of the present invention, the cross-sectional views illustrating the device structures are not partially enlarged in general scale for convenience of illustration, and the schematic views are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.

For convenience in description, spatial relational terms such as "below," "beneath," "below," "under," "over," "upper," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that these terms of spatial relationship are intended to encompass other orientations of the device in use or operation in addition to the orientation depicted in the figures. Further, when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present. In addition, "between … …" as used herein includes both endpoints.

In the context of this application, a structure described as having a first feature "on" a second feature may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed in between the first and second features, such that the first and second features may not be in direct contact.

It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than being drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of each component in actual implementation may be changed freely, and the layout of the components may be more complicated.

As shown in fig. 1-2, the present invention provides an X-ray flat panel detector imaging method based on region prediction, which is an imaging method for predicting a body region and automatically adjusting corresponding parameters to perform exposure according to the dose of a position to be observed. The method can solve the problems that in the prior art, ideal image effect is difficult to obtain by fixed dose imaging, proper dose cannot be adjusted according to a certain specific organ to shoot and image and the like. Based on the imaging method, the body part of the patient can be judged in advance under the condition that the detector is ensured to be normally arranged on the image, and the age of the patient, the size of the shot part and the dosage required by the shot part can be judged according to different X-ray transmittances and the like. The PGA can be adjusted correspondingly to change the sensitivity, thereby achieving the purpose of reducing the X-ray absorbed dose of the human body. In addition, the method does not need to change the hardware design, reduces the loss of the ray source, prolongs the service life and saves the cost.

The X-ray flat panel detector imaging method of the present invention will be described in detail below with reference to the accompanying drawings.

First, as shown in S1 in fig. 1, an object to be photographed is provided.

Specifically, the object to be photographed may be a human body, for example, a part of a region of the human body, including a plurality of organs. Of course, other objects to be detected may be used. That is, the present invention is not limited to medical diagnosis of a human body, and can be applied to other X-ray detection works such as security check. In this example, the object to be photographed is selected as a human body.

Next, as shown in S2 in fig. 1 and fig. 2, a predetermined dose exposure is performed on the object to be photographed to obtain a predetermined image 100, where the predetermined image 100 includes a plurality of

different image sub-regions

101, 102, 103, 104, 105, 106, and 107, and the image sub-regions are photographed images at different positions.

As an example, the image sub-regions may be divided according to different organs, for example, the

image sub-regions

101, 102, 103, 104, 105, 106, and 107 respectively represent different organs of a human body. In other examples, the division may also be by size, for example, a circular area of a certain radius. Of course, other dividing manners may also be adopted, and the dividing is performed according to the requirement of the object to be shot which is actually shot. In this example, the body organ is divided into parts.

As an example, the preset dose setting comprises: the preset dose is selected to be between 1/15-1/5 of the clinical dose. The clinical dose may be a dose commonly used in the art for a target site (e.g., a target organ) to be imaged, and may be derived from experience and general knowledge when given to the target site. For example, in this example, the pre-set dose is selected to be 1/12, 1/10, 1/8 of the clinical dose.

As an example, the preset dose is between 0.2uGy and 0.3uGy, for example, 0.22uGy, 0.25uGy, and 0.28uGy, and the pre-exposure dose for obtaining the pre-determined image by the X-ray flat panel detector imaging method according to the present invention may be effectively applicable to detection of a human body or other substances, and may be used for performing the pre-determination while ensuring that the detector normally ascends.

Next, as shown in S3 in fig. 1, the

image sub-regions

101, 102, 103, 104, 105, 106, 107 are compared to obtain a target image of a target portion to be observed, and a target dose required by the target portion is obtained.

Specifically, after the step, the target portion and the corresponding target image are obtained, and a target dose required by the target portion can also be obtained. For example, the image sub-region 106 is an image of a target portion to be observed obtained after comparison, and is the target image. In a specific example, as shown in fig. 2, when the object to be photographed is a human body, the image sub-regions include a chest image region, a shoulder image region, an abdomen image region, a waist image region, a lung image region, and a crotch image region. Wherein the lung is the target part, and the lung image region is the target image.

As an example, the target image is determined based on the X-ray transmittance of the respective image sub-regions. That is, after the predetermined image under the exposure of the preset dose is obtained, the transmittances of the

image sub-regions

101, 102, 103, 104, 105, 106, and 107 are analyzed, and it is needless to say that which image region is the imaging image of the target portion to be observed can be determined by further combining with experience in the art. The target part is judged according to the corresponding transmittance, and the method is simple and effective.

In a further example, when the target site is determined, the target dose may be derived based on its own characteristics. Of course, the target dose may be further derived based on features of the target image of the target site. For example, in one example, a feature of the target portion is determined based on the size and X-ray transmittance of the target image to determine the target dose based on the obtained feature, wherein the feature includes the age of the object to be photographed. For example, the target dose is obtained by determining the approximate position of each part of the body from the transmittance, and determining whether the current patient is an old person or a child or an adult of another age group based on the size and the transmittance of each part.

In addition, in an example, after obtaining the pre-judging image, the method further includes: and adjusting the FPGA parameters of the flat panel detector to change the sensitivity of the flat panel detector so as to reduce the target dose.

Specifically, in the scheme of the present invention, the FPGA controls an image acquisition process, and the ARM controls a detector configuration and data transmission, wherein after the pre-determined image is obtained, the target portion and the target image corresponding to the target portion are obtained, and then corresponding parameters may be adjusted based on characteristics (size, absorption rate, etc.) of the target image, for example, in an example, adjusting the FPGA includes adjusting a capacitance to improve sensitivity of the flat panel detector, so as to reduce the target dose, that is, a clear required image is obtained with a smaller target dose. That is, based on the manner of this step, the corresponding parameters can be adjusted according to different absorption rates of the organ to be observed, so as to achieve the purpose of reducing the dosage.

Finally, as shown in S4 in fig. 1, the object to be photographed is exposed to the target dose to obtain the desired image.

As an example, obtaining the desired image further comprises correcting the desired image to obtain a display image, wherein the correcting comprises at least one of background correction and gain correction. The correction mode can adopt the existing mode to correct.

Specifically, in this step, the target dose obtained in the preceding step is selected for exposure imaging on the basis of obtaining the pre-determined image, so that a desired imaging effect can be obtained.

In the technical scheme of the invention, the body part is pre-collected for initial judgment through the preset dose (selected as the small dose), the approximate positions of all parts of the body are judged according to the transmittance through the exposure of the preset small dose, and the size and the transmittance of all the parts are judged to judge whether the current patient is old or child or adult of other ages. And the specific target part which needs to be observed is selected by the doctor in advance to lock and adjust corresponding parameters (such as PGA and sensitivity). During the second exposure, the automatic exposure control of proper target dose is performed on a specific part, so that the best image effect can be presented by using less dose.

In addition, as shown in fig. 3, the present invention further provides an integrated block diagram of an image pre-judging and collecting system, and for the functional block distinction, the imaging system includes an X-ray pre-exposure module 201, a first signal conversion module 202, a signal reading processing pre-judging module 203, an X-ray exposure module 204, a second signal conversion module 205, a signal reading processing module 206, a correction module 207, and an image display module 208, which sequentially perform signal communication. Further, the X-ray pre-exposure module 201 performs exposure of a preset dose, the first signal conversion module 202 performs signal conversion based on a scintillator and a TFT panel, the signal reading processing pre-judging module 203 performs signal reading, amplification, analog-to-digital conversion and pre-judging a body part, the X-ray exposure module 204 performs exposure of a target dose, the second signal conversion module 205 performs signal conversion based on the scintillator and the TFT panel, the signal reading processing module 206 performs signal reading, amplification and analog-to-digital conversion, the correction module 207 performs background correction and gain correction, and the image display module 208 performs display of a corrected display image.

Based on the scheme, when the patient receives low-dose pre-exposure for the first time, the organ positions required to be observed by a doctor can be judged in advance according to the structure distribution of the human body part, namely, the specific direction of the body structure of the patient and the age bracket of the patient can be roughly judged by different doses of different positions received by the detector; the corresponding parameters are adjusted according to the body part which needs to be observed by the doctor in advance to adjust the dose of the second formal exposure, so that the condition of excessive dose receiving or insufficient dose receiving can be avoided, the dose of the body part is optimized, the sensitivity and the dynamic range of the detector are adjusted to reduce the dose, and the image quality is not influenced. That is, the detector estimates the dose required for the organ and automatically adjusts the corresponding PGA change sensitivity to ultimately expose the organ to view at the appropriate dose, avoiding unnecessary dose reception by the patient. The invention aims at maximizing the imaging effect at the angle of a patient and with the minimum dosage, reduces the shooting times, reduces the shooting dosage, enables the most accurate part of low-dosage shooting to be presented, does not cause various overexposure or incomplete acquired information caused by insufficient dosage, does not need to manually adjust the dosage for many times and repeatedly shoot by shooting personnel, can greatly reduce the dosage absorbed by the patient, reduces the cost of manpower and material resources, and improves the efficiency.

In addition, the present invention also provides a control device including: at least one processor; and a memory communicatively coupled to the processor; wherein:

the memory is used for storing a computer program;

the processor is configured to execute the computer program stored in the memory to cause the control device to perform the imaging method according to any one of the above aspects.

Specifically, the Processor may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the Integrated Circuit may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The memory includes various media that can store program codes, such as ROM, RAM, magnetic disk, U-disk, memory card, or optical disk.

It should be noted that the division of each functional unit of the above modules is only a logical division, and the actual implementation may be wholly or partially integrated into one physical entity, or may be physically separated. And these units can be implemented entirely in software, invoked by a processing element; or may be implemented entirely in hardware; the method can also be realized partly in the form of calling software by the processing element and partly in the form of hardware. The control device may be a processing element separately set up, or may be implemented by being integrated in a chip of the device, or may be stored in a memory of the device in the form of program codes, and a processing element of the device calls and executes the functions of the control module. Other modules are implemented similarly. In addition, all or part of the modules can be integrated together or can be independently realized. The processing element described herein may be an integrated circuit having signal processing capabilities. In implementation, the steps of the method or the modules may be implemented by hardware integrated logic circuits in a processor element or instructions in software.

For example, the above modules may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), among others. For another example, when one of the above modules is implemented in the form of a Processing element scheduler code, the Processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. For another example, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).

Furthermore, the present invention also provides a storage medium having stored thereon a computer program to be executed by a processor to implement the imaging method according to any one of the above aspects. Specifically, the storage medium includes various media that can store program codes, such as ROM, RAM, a magnetic disk, a usb disk, a memory card, or an optical disk.

In summary, the X-ray flat panel detector imaging method, the control device and the storage medium based on the part prejudgment of the present invention can analyze and prejudge the target part by performing the exposure of the preset dose, further adjust the radiation dose of the target part on the basis, and correspondingly adjust the PGA change sensitivity, so as to flexibly adjust the appropriate radiation dose for the target part, and further reduce the shooting dose to achieve the ideal shooting effect. The method of the invention can reduce the loss of the ray source, prolong the service life and save the cost without changing the hardware design. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. An X-ray flat panel detector imaging method based on position prediction is characterized by comprising the following steps: providing an object to be shot;

2. The imaging method of the X-ray flat panel detector based on the position prejudgment of claim 1, wherein the step of obtaining the prejudgment image further comprises the following steps: and adjusting the FPGA parameters of the flat panel detector to change the sensitivity of the flat panel detector so as to reduce the target dose.

3. The method of claim 2, wherein the adjusting the FPGA parameter comprises adjusting a capacitance to increase a sensitivity of the flat panel detector.

4. The method according to claim 1, wherein the target image is determined based on X-ray transmittance of each image sub-region.

5. The X-ray flat panel detector imaging method based on region prediction according to claim 4, wherein a feature of the target region is determined based on the size and X-ray transmittance of the target image to determine the target dose based on the obtained feature, wherein the feature comprises the age of the object to be photographed.

6. The method of claim 1, wherein obtaining the desired image further comprises correcting the desired image to obtain a display image, wherein the correcting comprises at least one of background correction and gain correction.

7. The X-ray flat panel detector imaging method based on position prediction according to claim 1, wherein when the object to be photographed is a human body, the image sub-regions comprise a chest image region, a shoulder image region, an abdomen image region, a waist image region, a lung image region and a crotch image region.

8. The method according to any one of claims 1-7, wherein the setting of the preset dose comprises: the preset dose is selected to be between 1/15-1/5 of the clinical dose.

9. A control device, characterized in that the control device comprises:

at least one processor; and

the memory is configured to store a computer program, and the processor is configured to execute the computer program stored by the memory to cause the control apparatus to perform the imaging method according to any one of claims 1 to 8.

10. A storage medium having stored thereon a computer program for execution by a processor for implementing the imaging method according to any one of claims 1 to 8.