CN110109174B - Drift correction method, device and system for flat panel detector and storage medium - Google Patents
Drift correction method, device and system for flat panel detector and storage medium Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
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Abstract
The embodiment of the invention discloses a drift correction method, a device, a system and a storage medium of a flat panel detector. The method comprises the following steps: determining a current frame rate value and a current operating temperature value of the flat panel detector; acquiring an X-ray image acquired by the flat panel detector at the current frame rate value and the current working temperature value; retrieving a drift template corresponding to the current frame rate value and the current operating temperature value from a drift template library; a drift correction is performed on the X-ray image based on the drift template. The embodiment of the invention can solve the problem of system resource occupation caused by generating the drift template in real time. Moreover, even if X-ray image imaging needs to be performed for a plurality of times, a drift template does not need to be frequently generated, and the workload is remarkably reduced.
Description
Technical Field
The present invention relates to the field of X-ray imaging technologies, and in particular, to a drift correction method, apparatus, system, and storage medium for a flat panel detector.
Background
X-rays are electromagnetic radiation having wavelengths between ultraviolet and gamma rays. X-rays have penetrability and have different penetrability to substances with different densities. In medicine, human organs and bones are generally projected with X-rays to form medical images. The flat panel detector is a precision device, plays a decisive role in the X-ray imaging quality, and is familiar with the performance index of the detector, thereby being beneficial to improving the imaging quality and reducing the X-ray radiation dose.
Flat panel detectors typically include amorphous selenium flat panel detectors and amorphous silicon flat panel detectors. During use, the flat panel detector can generate an electronic reference drift phenomenon, and needs to be corrected. Drift calibration work of flat panel detectors is a key element in imaging quality control management. A well calibrated flat panel detector can improve the stability of the flat panel detector and play an important role in the overall imaging chain.
In the prior art, a drift template is typically generated in real-time (e.g., 2 minutes apart) as the X-ray image is imaged, and the flat panel detector is calibrated based on the real-time generated drift template.
However, generating the drift template in real time can significantly occupy system resources and increase power consumption. Moreover, frequent generation of drift templates increases the effort when performing X-ray image imaging multiple times.
Disclosure of Invention
The embodiment of the invention provides a drift correction method, device and system for a flat panel detector and a storage medium.
A method of drift correction for a flat panel detector, comprising:
determining a current frame rate value and a current operating temperature value of the flat panel detector;
acquiring an X-ray image acquired by the flat panel detector at the current frame rate value and the current working temperature value;
retrieving a drift template corresponding to the current frame rate value and the current operating temperature value from a drift template library;
a drift correction is performed on the X-ray image based on the drift template.
Therefore, in the embodiment of the invention, when the drift template is needed, the drift template is directly retrieved from the drift template library without generating the drift template in real time, so that the problem of system resource occupation caused by generating the drift template in real time can be solved. Moreover, even if X-ray image imaging needs to be performed for a plurality of times, a drift template does not need to be frequently generated, and the workload is remarkably reduced.
In one embodiment, the performing drift correction on the X-ray image based on a drift template includes:
determining the gray value of a pixel point in the X-ray image and the gray value of a corresponding pixel point in the drift template;
and subtracting the gray value of the corresponding pixel point in the drift template from the gray value of the pixel point in the X-ray image.
Therefore, the embodiment of the invention realizes the drift correction for the X-ray image through the correction of the gray value of the searched drift template and the X-ray image.
In one embodiment, said retrieving a drift template from a library of drift templates corresponding to said current frame rate value and said current operating temperature value comprises at least one of:
retrieving a drift template corresponding to the current frame rate value and the current operating temperature value from the drift template library arranged in the cloud;
retrieving a drift template corresponding to the current frame rate value and the current operating temperature value from the drift template library disposed in a workstation;
a drift template corresponding to the current frame rate value and the current operating temperature value is retrieved from the library of drift templates disposed in the flat panel detector.
Therefore, the embodiment of the invention can arrange the drift template library in the cloud, the workstation or the flat panel detector, has various embodiments, is suitable for various application environments, and improves the applicability.
In one embodiment, the method further comprises:
setting an operating temperature acquisition value and a frame rate acquisition value;
acquiring a plurality of dark field images when the flat panel detector works at the working temperature acquisition value and the frame rate acquisition value;
determining a gray level average map of the plurality of dark field images, and determining the gray level average map as a drift template corresponding to the operating temperature acquisition value and the frame rate acquisition value;
the drift templates corresponding to the operating temperature acquisition values and the frame rate acquisition values are stored into the drift template library.
Thus, embodiments of the present invention also enable the creation of a drift template library corresponding to the operating temperature acquisition values and frame rate acquisition values using dark field images.
A drift correction device for a flat panel detector, comprising:
the parameter determining module is used for determining the current frame rate value and the current working temperature value of the flat panel detector;
an X-ray image acquisition module for acquiring an X-ray image acquired by the flat panel detector at the current frame rate value and the current working temperature value;
a drift correction module for retrieving a drift template corresponding to the current frame rate value and the current operating temperature value from a library of drift templates and performing drift correction on the X-ray image based on the drift template.
Therefore, in the embodiment of the invention, when the drift template is needed, the drift template is directly retrieved from the drift template library without generating the drift template in real time, so that the problem of system resource occupation caused by generating the drift template in real time can be solved. Moreover, even if X-ray image imaging needs to be performed for a plurality of times, a drift template does not need to be frequently generated, and the workload is remarkably reduced.
In one embodiment, the drift correction module is configured to determine a gray value of a pixel in the X-ray image and a gray value of a corresponding pixel in the drift template; and subtracting the gray value of the corresponding pixel point in the drift template from the gray value of the pixel point in the X-ray image.
Therefore, the embodiment of the invention realizes the drift correction for the X-ray image through the correction of the gray value of the searched drift template and the X-ray image.
In one embodiment, the drift correction module is configured to perform at least one of:
retrieving a drift template corresponding to the current frame rate value and the current operating temperature value from the drift template library arranged in the cloud;
retrieving a drift template corresponding to the current frame rate value and the current operating temperature value from the drift template library disposed in a workstation;
a drift template corresponding to the current frame rate value and the current operating temperature value is retrieved from a library of drift templates disposed in the flat panel detector.
Therefore, the embodiment of the invention can arrange the drift template library in the cloud, the workstation or the flat panel detector, has various embodiments, is suitable for various application environments, and improves the applicability.
In one embodiment, the method further comprises:
the drift template library building module is used for setting a working temperature acquisition value and a frame rate acquisition value; acquiring a plurality of dark field images when the flat panel detector works at the working temperature acquisition value and the frame rate acquisition value; determining a gray level average map of the plurality of dark field images, and determining the gray level average map as a drift template corresponding to the operating temperature acquisition value and the frame rate acquisition value; the drift templates corresponding to the operating temperature acquisition values and the frame rate acquisition values are stored into the drift template library.
Thus, embodiments of the present invention also enable the creation of a drift template library corresponding to the operating temperature acquisition values and frame rate acquisition values using dark field images.
A drift correction system for a flat panel detector, comprising:
a flat panel detector;
the temperature sensor is used for determining the current working temperature value of the flat panel detector;
a drift template library for storing a plurality of drift templates, each drift template corresponding to a respective frame rate value and a respective operating temperature value;
the control host is used for acquiring a current frame rate value of the flat panel detector, acquiring an X-ray image acquired by the flat panel detector when the current frame rate value and the current working temperature value, retrieving a drift template corresponding to the current frame rate value and the current working temperature value from the drift template library, and executing drift correction on the X-ray image based on the retrieved drift template.
Therefore, in the embodiment of the invention, the control host directly retrieves the drift template from the drift template library when the drift template is needed, and the drift template is not needed to be generated in real time, so that the problem of system resource occupation caused by the real-time generation of the drift template can be solved. Moreover, even if X-ray image imaging needs to be performed for a plurality of times, a drift template does not need to be frequently generated, and the workload is remarkably reduced.
In one embodiment, the flat panel detector is a dynamic flat panel detector or a static flat panel detector.
Thus, embodiments of the present invention may be applied to both dynamic flat panel detectors that produce dynamic images and static flat panel detectors that produce static images.
A drift correction device for a flat panel detector, the device comprising: a processor and a memory;
the memory has stored therein an application executable by the processor for causing the processor to perform the steps of the flat panel detector drift correction method as set forth in any one of the preceding claims.
Therefore, the embodiment of the invention also realizes a drift correction device based on a processor and a memory architecture, and the processor can execute the steps of the drift correction method of the flat panel detector.
A computer readable storage medium having stored therein computer readable instructions for performing the steps of the flat panel detector drift correction method as set forth in any one of the preceding claims.
Thus, the embodiments of the present invention also realize a computer-readable storage medium, in which computer-readable instructions stored in the computer-readable storage medium can perform the steps of the drift correction method of the flat panel detector.
Drawings
Fig. 1 is an exemplary flowchart of a drift correction method of a flat panel detector according to an embodiment of the present invention.
Fig. 2 is an exemplary flow chart of a method of generating a drift template library according to an embodiment of the invention.
Fig. 3 is an exemplary structural view of a drift correction device of a flat panel detector according to an embodiment of the present invention.
Fig. 4 is an exemplary block diagram of a drift correction system of a flat panel detector according to an embodiment of the present invention.
Fig. 5 is an exemplary structural view of a drift correction device of a flat panel detector according to an embodiment of the present invention.
FIG. 6 is a schematic view of drift correction for a flat panel detector disposed in a chest radiography rack assembly according to an embodiment of the present invention.
FIG. 7 is a schematic diagram of drift correction for a flat panel detector disposed in an examination couch assembly according to an embodiment of the invention.
Wherein, the reference numerals are as follows:
Detailed Description
In order to make the technical scheme and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description is intended to illustrate the invention and is not intended to limit the scope of the invention.
For simplicity and clarity of description, the following description sets forth aspects of the invention by describing several exemplary embodiments. Numerous details in the embodiments are provided solely to aid in the understanding of the invention. It will be apparent, however, that the embodiments of the invention may be practiced without limitation to these specific details. Some embodiments are not described in detail in order to avoid unnecessarily obscuring aspects of the present invention, but rather only to present a framework. Hereinafter, "comprising" means "including but not limited to", "according to … …" means "according to at least … …, but not limited to only … …". The term "a" or "an" is used herein to refer to a number of components, either one or more, or at least one, unless otherwise specified.
Applicants have found that the usual handling of flat panel detector drift correction in the prior art is: a drift template for drift correction is generated in real-time as the X-ray image is imaged to reduce the effects of operating temperature and frame rate values on the drift template. This way of handling is based on the following considerations: the intrinsic drift properties of flat panel detectors are related to the operating temperature and frame rate values, so it is desirable to generate the drift template in real time as the X-ray image is imaged to avoid the effects of possible variations in the operating temperature and frame rate values on the drift template. However, the applicant has also found that this conventional approach of the prior art results in a significant occupation of system resources and a significant increase in power consumption. This is because: in X-ray image imaging, a significant amount of system resources are required to generate the drift template in real-time. In addition, frequent generation of drift templates also increases the effort when performing X-ray image imaging multiple times.
The applicant has also found that if the conventional processing mode of the prior art is broken through, the drift templates are not generated in real time during the imaging of the X-ray image, but a drift template library containing the drift templates corresponding to the frame rate value and the operating temperature value is pre-established, when the drift correction is required to be performed on the X-ray image, the drift template library corresponding to the current frame rate value and the current operating temperature value is retrieved from the drift template library, and the drift correction is performed by using the retrieved drift templates, so that the system resource occupation problem caused by generating the drift templates in real time can be overcome. Moreover, even if the X-ray image imaging needs to be performed a plurality of times, the drift templates do not need to be frequently generated (only the corresponding drift templates need to be searched), and the workload can be remarkably reduced.
Fig. 1 is an exemplary flowchart of a drift correction method of a flat panel detector according to an embodiment of the present invention.
As shown in fig. 1, the method includes:
step 102: a current frame rate value and a current operating temperature value of the flat panel detector are determined.
Herein, the frame rate value of the flat panel detector refers to the number of pictures refreshed per second by the flat panel detector. The current frame rate value of the flat panel detector may be determined based on the current operating mode of the flat panel detector. Furthermore, the current operating temperature value of the flat panel detector may be determined using temperature sensors disposed on or at peripheral locations of the flat panel detector.
While the above describes exemplary embodiments for determining a current frame rate value and a current operating temperature value for a flat panel detector, those skilled in the art will recognize that this description is exemplary only and is not intended to limit the scope of embodiments of the present invention.
Step 104: x-ray images acquired by the flat panel detector at a current frame rate value and a current operating temperature value are acquired.
Here, an X-ray image of the object to be detected may be acquired using a flat panel detector operating at the current frame rate value and the current operating temperature value determined at step 102.
For example, the flat panel detector may be implemented as an amorphous selenium flat panel detector. The amorphous selenium flat panel detector may include a current collection matrix, a selenium layer, a dielectric layer, a top electrode, and a protective layer. The collector matrix is composed of Thin Film Transistors (TFTs) arranged in array elements. The amorphous selenium semiconductor material forms a film above the thin film transistor by vacuum evaporation, and the film is sensitive to X rays and has high image resolution capability. The top electrode is connected with a high-voltage power supply. When X-rays are incident, the X-rays can only vertically reach the amorphous selenium along the direction of the electric field due to the electric field formed on the surface of the amorphous selenium by the high-voltage power supply. The amorphous selenium converts X-rays into electric signals, the electric signals are stored in a storage capacitor, a pulse control gate circuit enables a thin film transistor to be conducted, charges stored in the storage capacitor are sent to a charge amplifier to be output, photoelectric signal conversion is completed, and then a digital format X-ray image is formed through digital converter conversion.
As another example, the flat panel detector may be implemented as an amorphous silicon flat panel detector. The amorphous silicon flat panel detector is an indirect digital X-ray imaging, the basic structure is that the surface is a layer of scintillator material (cesium iodide or sulfur oxide), the next layer is a photodiode circuit which takes amorphous silicon as a material, and the bottom layer is a charge readout circuit. The scintillator positioned on the surface of the detector converts the attenuated X-rays passing through the object to be detected into visible light, the amorphous silicon photodiode array under the scintillator converts the visible light into an electric signal, stored charges are formed on the capacitor of the photodiode, the stored charge quantity of each pixel is in direct proportion to the intensity of the incident X-rays, and under the action of the charge reading circuit, the stored charges of each pixel are scanned and read out and converted by the digital converter to form a digital X-ray image.
While specific examples of the flat panel detector and imaging modality have been described above in the exemplary context, it will be appreciated by those skilled in the art that this description is exemplary only and is not intended to limit the scope of the embodiments of the present invention.
Step 106: a drift template corresponding to the current frame rate value and the current operating temperature value is retrieved from a library of drift templates.
Wherein the drift template library may be arranged in the cloud, in a workstation or in a flat panel detector. A plurality of drift templates are pre-stored in a drift template library, each drift template corresponding to a respective frame rate value and a respective operating temperature value. By retrieving the drift template corresponding to the current frame rate value and the current operating temperature value from the drift template library, the operation step of generating the drift template in real time may be omitted.
Step 108: drift correction is performed on the X-ray image based on the drift template.
In one embodiment, a specific process for performing drift correction on an X-ray image based on a drift template includes: first, the gray value of the pixel point in the X-ray image and the gray value of the corresponding pixel point in the drift template are determined. Then, the gray value of the corresponding pixel point in the drift template is subtracted from the gray value of the pixel point in the X-ray image, and the finally formed image is the X-ray image after the drift correction is executed. The pixels in the X-ray image involved in performing the drift correction may be all pixels or a predetermined number (e.g., one or more) of pixels.
Such as: determining gray values of all pixel points in an X-ray image and gray values of all corresponding pixel points in a drift template; then, the gray value of each pixel point in the X-ray image is subtracted by the gray value of the corresponding pixel point in the drift template, and the finally formed image is the X-ray image after the drift correction is executed.
For another example: determining gray values of a preset number of pixel points in an X-ray image and gray values of a corresponding preset number of pixel points in a drift template; then, the gray value of each pixel point in the preset number of pixel points in the X-ray image is subtracted by the gray value of the corresponding pixel point in the drift template, and the finally formed image is the X-ray image after the drift correction is executed.
Therefore, in the embodiment of the invention, when the drift template is needed to be used, the drift template can be directly retrieved from the drift template library without generating the drift template in real time, so that the problem of system resource occupation caused by generating the drift template in real time is solved.
Furthermore, even if the X-ray image imaging needs to be performed a plurality of times, it is not necessary to frequently generate a drift template, and thus the workload is also significantly reduced.
Based on the above description, the embodiment of the invention further provides a method for generating the drift template library. The method of generating a drift template library according to the embodiments of the present invention may be performed at any time prior to step 106 in the drift correction method of the flat panel detector shown in fig. 1.
Fig. 2 is an exemplary flow chart of a method of generating a drift template library according to an embodiment of the invention.
As shown in fig. 2, the method includes:
step 202: setting an operating temperature acquisition value and a frame rate acquisition value.
Step 204: a plurality of dark field images are acquired when the flat panel detector is operating at an operating temperature acquisition value and a frame rate acquisition value.
Dark field image means here an image produced by the flat panel detector when the X-rays are switched off.
Step 206: a gray level average map of the plurality of dark field images is determined, and the gray level average map is determined as a drift template corresponding to the operating temperature acquisition value and the frame rate acquisition value.
Step 208: a drift template corresponding to the operating temperature acquisition value and the frame rate acquisition value is stored in a drift template library.
Based on the flow shown in fig. 2, a library of drift templates may be generated. The drift template library stores a plurality of drift templates, each corresponding to a respective frame rate value and a respective operating temperature value.
For example, a plurality of operating temperature acquisition values and a plurality of frame rate acquisition values may be set. Considering the arrangement environment of the flat panel detector, the working temperature acquisition value interval can be set to be between 10 ℃ and 35 ℃, and the acquisition temperature interval is 1 ℃, and the set working temperature acquisition value specifically comprises: 10 degrees celsius, 11 degrees celsius, 12 degrees celsius, 13 degrees celsius, 14 degrees celsius, 15 degrees celsius, 16 degrees celsius, 17 degrees celsius, 18 degrees celsius, 19 degrees celsius, 20 degrees celsius, 21 degrees celsius, 22 degrees celsius, 23 degrees celsius, 24 degrees celsius, 25 degrees celsius, 26 degrees celsius, 27 degrees celsius, 28 degrees celsius, 29 degrees celsius, 30 degrees celsius, 31 degrees celsius, 32 degrees celsius, 33 degrees celsius, 34 degrees celsius, and 35 degrees celsius. Also, setting the frame rate acquisition value of the flat panel detector includes: 0.5, 1, 2, 3, 5, 7.5, 10, 15 and 30.
Then, for each working temperature acquisition value and each frame rate acquisition value, respectively acquiring gray level average images of a plurality of dark field images, and determining the gray level average images as a drift template corresponding to the working temperature acquisition value and the frame rate acquisition value.
For example, when the operation temperature of the flat panel detector is 10 degrees celsius and the frame rate acquisition value is 0.5, the X-rays are turned off, 8 dark field images are acquired from the flat panel detector, and the gray level average map of the 8 dark field images is determined as a drift template corresponding to the operation temperature acquisition value of 10 degrees celsius and the frame rate acquisition value of 0.5. For another example, when the operating temperature of the flat panel detector is 10 degrees celsius and the frame rate acquisition value is 1, the X-rays are turned off, 8 dark field images are acquired from the flat panel detector, and the gray level average map of the 8 dark field images is determined as a drift template corresponding to the operating temperature acquisition value of 10 degrees celsius and the frame rate acquisition value of 1. For another example, when the operating temperature of the flat panel detector is 10 degrees celsius and the frame rate acquisition value is 2, the X-rays are turned off, 8 dark field images are acquired from the flat panel detector, and the gray level average map of the 8 dark field images is determined as a drift template corresponding to the operating temperature acquisition value of 10 degrees celsius and the frame rate acquisition value of 2. By analogy, a drift template corresponding to all frame rate acquisition values can be established when the operating temperature of the flat panel detector is 10 degrees celsius.
Similarly, when the operating temperature of the flat panel detector is 11 degrees celsius and the frame rate acquisition value is 0.5, the X-rays are turned off, 8 dark field images are acquired from the flat panel detector, and the gray level average map of the 8 dark field images is determined to correspond to a drift template having the operating temperature acquisition value of 11 degrees celsius and the frame rate acquisition value of 0.5. For another example, when the operating temperature of the flat panel detector is 11 degrees celsius and the frame rate acquisition value is 1, the X-rays are turned off, 8 dark field images are acquired from the flat panel detector, and the gray level average map of the 8 dark field images is determined as a drift template corresponding to the operating temperature acquisition value of 10 degrees celsius and the frame rate acquisition value of 1. For another example, when the operating temperature of the flat panel detector is 11 degrees celsius and the frame rate acquisition value is 2, the X-rays are turned off, 8 dark field images are acquired from the flat panel detector, and the gray level average map of the 8 dark field images is determined as a drift template corresponding to the operating temperature acquisition value of 11 degrees celsius and the frame rate acquisition value of 2. By analogy, a drift template corresponding to all frame rate acquisition values can be established when the operating temperature of the flat panel detector is 11 degrees celsius.
By analogy, a drift template for each operating temperature of the flat panel detector corresponding to each frame rate acquisition value can be created, and all generated drift templates are stored in a drift template library.
The above exemplary process of generating a library of drift templates is described by way of example with specific values, and those skilled in the art will appreciate that this description is exemplary only and is not intended to limit the scope of embodiments of the present invention.
The drift template library generated based on the flow of fig. 2 may be saved to the cloud. When the drift correction is required to be executed, a drift template corresponding to the current frame rate value and the current working temperature value is retrieved from the cloud. Alternatively, the drift template library generated based on the flow of fig. 2 may also be saved to the workstation. When drift correction is required, a drift template corresponding to the current frame rate value and the current operating temperature value is retrieved from the workstation. Alternatively, the drift template library generated based on the flow of fig. 2 may also be saved to the flat panel detector. When drift correction is required, a drift template corresponding to the current frame rate value and the current operating temperature value is retrieved from the flat panel detector. Optionally, the drift template library generated based on the flow of fig. 2 may be stored in various storage media, such as a floppy disk, an optical disk, a DVD, a hard disk, a flash memory, a usb disk, a CF card, an SD card, an MMC card, an SM card, a memory stick, an xD card, and when the drift correction needs to be performed, the drift template corresponding to the current frame rate value and the current operating temperature value may be retrieved from the storage media.
Based on the above description, the embodiment of the invention further provides a drift correction device of the flat panel detector.
Fig. 3 is an exemplary structural view of a drift correction device of a flat panel detector according to an embodiment of the present invention.
As shown in fig. 3, the drift correction device 300 of the flat panel detector includes:
a parameter determination module 301, configured to determine a current frame rate value and a current operating temperature value of the flat panel detector;
an X-ray image acquisition module 302 for acquiring an X-ray image acquired by the flat panel detector at a current frame rate value and a current operating temperature value;
a drift correction module 303 for retrieving a drift template corresponding to the current frame rate value and the current operating temperature value from a library of drift templates and performing drift correction on the X-ray image based on the drift template.
In one embodiment, the drift correction module 303 is configured to determine a gray value of a pixel in the X-ray image and a gray value of a corresponding pixel in the drift template; and subtracting the gray value of the corresponding pixel in the drift template from the gray value of the pixel in the X-ray image.
In one embodiment, the drift correction module 303 is configured to perform at least one of:
retrieving a drift template corresponding to the frame rate value and the operating temperature value from a drift template library arranged in the cloud;
retrieving a drift template corresponding to the frame rate value and the operating temperature value from a library of drift templates disposed in a workstation;
a drift template corresponding to the frame rate value and the operating temperature value is retrieved from a library of drift templates disposed in the flat panel detector.
In one embodiment, the drift correction device 300 further includes:
the drift template library establishing module 304 is used for setting a working temperature acquisition value and a frame rate acquisition value; acquiring a plurality of dark field images when the flat panel detector works at the working temperature acquisition value and the frame rate acquisition value; determining a gray level average image of the plurality of dark field images, and determining the gray level average image as a drift template corresponding to the working temperature acquisition value and the frame rate acquisition value; a drift template corresponding to the operating temperature acquisition value and the frame rate acquisition value is stored in the drift template library.
Based on the above description, the embodiment of the invention further provides a drift correction system of the flat panel detector.
Fig. 4 is an exemplary block diagram of a drift correction system of a flat panel detector according to an embodiment of the present invention.
As shown in fig. 4, the drift correction system 400 of the flat panel detector includes:
a flat panel detector 401;
a temperature sensor 402 for determining a current operating temperature value of the flat panel detector 401;
a drift template library 403 for storing a plurality of drift templates, each drift template corresponding to a respective frame rate value and a respective operating temperature value;
a control host 404 for acquiring a current frame rate value of the flat panel detector, acquiring an X-ray image acquired by the flat panel detector at the current frame rate value and the current operating temperature value, retrieving a drift template corresponding to the current frame rate value and the current operating temperature value from a drift template library 403, and performing drift correction on the X-ray image based on the retrieved drift template.
In one embodiment, flat panel detector 401 is a dynamic flat panel detector or a static flat panel detector. The dynamic flat panel detector is used for acquiring dynamic X-ray images; the static flat panel detector is used to acquire static, static X-ray images.
Fig. 5 is an exemplary structural view of a drift correction device of a flat panel detector according to an embodiment of the present invention.
As shown in fig. 5, the drift correction device 500 of the flat panel detector includes: a processor 501 and a memory 502; wherein the memory 502 has stored therein an application executable by the processor 501 for causing the processor 501 to perform the steps of the flat panel detector drift correction method as described in any one of the above.
In a particular application, embodiments of the present invention may be implemented in a variety of environments. For example, embodiments of the present invention may be implemented in an application environment that acquires dynamic X-ray images, and embodiments of the present invention may also be implemented in an application environment that acquires static X-ray images.
The following describes embodiments of the invention as applied to direct digital radiography (Digital Radiology, DR). The DR technology has the characteristics of high imaging speed, convenient operation and high imaging resolution, and becomes the dominant direction of X-ray photography. An X-ray machine system generally includes: an X-ray tube, an X-ray generator, a chest radiography (BWS) assembly, a flat panel detector, a Table assembly, and a workstation. The object to be detected stands near the chest stand component or lies on the examination bed component, and can receive X-ray photography of various parts such as skull, chest, abdomen, joints and the like. Wherein: the subject to be examined includes various subjects capable of utilizing the chest stand assembly, the couch assembly, and the X-ray machine control module set forth herein, including but not limited to, animate or inanimate humans or animals, or objects.
FIG. 6 is a schematic view of drift correction for a flat panel detector disposed in a chest radiography rack assembly according to an embodiment of the present invention.
In fig. 6, the chest stand assembly 62 includes: a column 11; and a cassette assembly 12 slidably disposed on the upright 11. The cassette assembly 12 is arranged on the upright 11 by means of a slide rail. Cassette assembly 12 is slidable vertically and horizontally on upright 11. Cassette assembly 12 includes a faceplate and a rear housing, and may also include armrests. A flat panel detector 17 may be interposed between the front and rear of cassette assembly 12.
During radiography, an object to be inspected stands around the cassette assembly 12 or holds the cassette assembly 12. X-rays emitted from an X-ray tube (for example, disposed on a ceiling of a house) transmit through an object to be detected, and the flat panel detector 17 detects an X-ray image of the object to be detected. The flat panel detector 17 may be implemented as a wired flat panel detector or a wireless flat panel detector. Accordingly, the flat panel detector 17 may transmit the X-ray image as medical image information to the workstation 61 by wired or wireless means.
The interface between the chest stand assembly 62 and the workstation 61 may be implemented as a wireless interface. For example, it may be implemented as: infrared interfaces, near field communication interfaces, bluetooth interfaces, zigbee interfaces, wireless broadband interfaces, second generation mobile communication interfaces, third generation mobile communication interfaces, fourth generation mobile communication interfaces, or fifth generation mobile communication interfaces, and so forth. The interface between the chest stand assembly 62 and the workstation 61 may also be implemented as a wired interface. For example, it may be implemented as: universal Serial Bus (USB) interface, mini universal serial bus interface, controller Area Network (CAN) interface or serial port, and the like.
The workstation 61 stores therein a drift template library generated based on the flow of the method of fig. 2. The workstation 61 determines the current frame rate value and the current operating temperature value of the flat panel detector 17, retrieves a drift template corresponding to the current frame rate value and the current operating temperature value from a drift template library, and then performs drift correction on the X-ray image of the object to be inspected provided by the flat panel detector 17 based on the drift template. The method specifically comprises the following steps: the workstation 61 determines the gray value of a pixel in the X-ray image and the gray value of a corresponding pixel in the drift template; and subtracting the gray value of the corresponding pixel in the drift template from the gray value of the pixel in the X-ray image.
FIG. 7 is a schematic diagram of drift correction for a flat panel detector disposed in an examination couch assembly according to an embodiment of the invention.
In fig. 7, the couch assembly 72 includes: a bed 21; a bed plate 28 arranged on the bed body 21; a flat panel detector 27 is slidably disposed under the bed plate 28.
The couch assembly 72 may also include a column 22 secured to the couch 21. An X-ray tube 23 is arranged on the column 22 so as to be slidable up and down. The bed board 28 is arranged on the bed body 21 through a sliding rail, and the bed board 28 can horizontally slide on the bed body 21. The flat panel detector 27 is disposed between the bed plate 28 and the bed 21, and the flat panel detector 27 is horizontally slidable between the bed plate 28 and the bed 21.
During the radiography, the subject to be examined is laid on the bed board 21. The X-rays emitted from the X-ray tube 23 pass through the object to be detected, and the flat panel detector 27 detects an X-ray image of the object to be detected.
The flat panel detector 27 may be implemented as a wired flat panel detector or a wireless flat panel detector. Accordingly, the flat panel detector 27 may transmit the X-ray image as medical image information to the workstation 71 by wired or wireless means.
The interface between the couch assembly 72 and the workstation 71 may be implemented as a wireless interface. For example, it may be implemented as: infrared interfaces, near field communication interfaces, bluetooth interfaces, zigbee interfaces, wireless broadband interfaces, second generation mobile communication interfaces, third generation mobile communication interfaces, fourth generation mobile communication interfaces, or fifth generation mobile communication interfaces, and so forth. The interface between the couch assembly 72 and the workstation 71 may also be implemented as a wired interface. For example, it may be implemented as: universal Serial Bus (USB) interface, mini universal serial bus interface, controller Area Network (CAN) interface or serial port, and the like.
The workstation 71 stores therein a drift template library generated based on the method shown in fig. 2. The workstation 71 determines the current frame rate value and the current operating temperature value of the flat panel detector 27, retrieves a drift template corresponding to the current frame rate value and the current operating temperature value from a library of drift templates, and then performs drift correction on the X-ray image provided by the flat panel detector 27 based on the drift template. The method specifically comprises the following steps: the workstation 71 determines the gray value of a pixel in the X-ray image and the gray value of a corresponding pixel in the drift template; and subtracting the gray value of the corresponding pixel in the drift template from the gray value of the pixel in the X-ray image.
Specific applications of embodiments of the present invention are described above using a chest stand assembly and an exam bed assembly as examples. Indeed, embodiments of the present invention may also be implemented in a variety of C-arms. Such as small C (C-arm, small C, orthopedic C-arm), medium C (peripheral interventional C-arm) or large C (DSA vascular machine).
It should be noted that not all the steps and modules in the above processes and the structure diagrams are necessary, and some steps or modules may be omitted according to actual needs. The execution sequence of the steps is not fixed and can be adjusted as required. The division of the modules is merely for convenience of description and the division of functions adopted in the embodiments, and in actual implementation, one module may be implemented by a plurality of modules, and functions of a plurality of modules may be implemented by the same module, and the modules may be located in the same device or different devices.
The hardware modules in the various embodiments may be implemented mechanically or electronically. For example, a hardware module may include specially designed permanent circuits or logic devices (e.g., special purpose processors such as FPGAs or ASICs) for performing certain operations. A hardware module may also include programmable logic devices or circuits (e.g., including a general purpose processor or other programmable processor) temporarily configured by software for performing particular operations. As regards implementation of the hardware modules in a mechanical manner, either by dedicated permanent circuits or by circuits that are temporarily configured (e.g. by software), this may be determined by cost and time considerations.
The present invention also provides a machine-readable storage medium storing instructions for causing a machine to perform a method as described herein. Specifically, a system or apparatus provided with a storage medium on which a software program code realizing the functions of any of the above embodiments is stored, and a computer (or CPU or MPU) of the system or apparatus may be caused to read out and execute the program code stored in the storage medium. Further, some or all of the actual operations may be performed by an operating system or the like operating on a computer based on instructions of the program code. The program code read out from the storage medium may also be written into a memory provided in an expansion board inserted into a computer or into a memory provided in an expansion unit connected to the computer, and then, based on instructions of the program code, a CPU or the like mounted on the expansion board or the expansion unit may be caused to perform part or all of actual operations, thereby realizing the functions of any of the above embodiments.
Storage medium implementations for providing program code include floppy disks, hard disks, magneto-optical disks, optical disks (e.g., CD-ROMs, CD-R, CD-RWs, DVD-ROMs, DVD-RAMs, DVD-RWs, DVD+RWs), magnetic tapes, non-volatile memory cards, and ROMs. Alternatively, the program code may be downloaded from a server computer by a communication network.
The foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for correcting drift of a flat panel detector, comprising:
determining a current frame rate value and a current operating temperature value for the flat panel detector (102);
acquiring an X-ray image (104) acquired by the flat panel detector at the current frame rate value and the current operating temperature value;
-retrieving a drift template (106) corresponding to the current frame rate value and the current operating temperature value from a library of drift templates;
-performing a drift correction (108) on the X-ray image based on the drift template;
the flat panel detector is an amorphous selenium flat panel detector or an amorphous silicon flat panel detector in C-arm X-ray equipment;
the method further comprises the steps of:
setting an operating temperature acquisition value and a frame rate acquisition value (202);
acquiring a plurality of dark field images (204) when the flat panel detector is operating at the operating temperature acquisition value and the frame rate acquisition value;
determining a gray-level average map of the plurality of dark-field images, the gray-level average map being determined as a drift template (206) corresponding to the operating temperature acquisition value and the frame rate acquisition value;
the drift templates corresponding to the operating temperature acquisition values and the frame rate acquisition values are stored in the drift template library (208).
2. The drift correction method of a flat panel detector according to claim 1, characterized in that the performing drift correction (108) on the X-ray image based on a drift template comprises:
determining the gray value of a pixel point in the X-ray image and the gray value of a corresponding pixel point in the drift template;
and subtracting the gray value of the corresponding pixel point in the drift template from the gray value of the pixel point in the X-ray image.
3. The drift correction method of a flat panel detector according to claim 1, characterized in that said retrieving a drift template (106) corresponding to the current frame rate value and the current operating temperature value from a drift template library comprises at least one of the following:
retrieving a drift template corresponding to the current frame rate value and the current operating temperature value from the drift template library arranged in the cloud;
retrieving a drift template corresponding to the current frame rate value and the current operating temperature value from the drift template library disposed in a workstation;
a drift template corresponding to the current frame rate value and the current operating temperature value is retrieved from the library of drift templates disposed in the flat panel detector.
4. Drift correction device (300) for flat panel detector, characterized by comprising:
a parameter determination module (301) for determining a current frame rate value and a current operating temperature value of the flat panel detector;
an X-ray image acquisition module (302) for acquiring an X-ray image acquired by the flat panel detector at the current frame rate value and the current operating temperature value;
a drift correction module (303) for retrieving a drift template corresponding to the current frame rate value and the current operating temperature value from a library of drift templates and performing drift correction on the X-ray image based on the drift template;
the flat panel detector is an amorphous selenium flat panel detector or an amorphous silicon flat panel detector in C-arm X-ray equipment;
the drift correction device (300) of the flat panel detector further includes:
a drift template library establishing module (304) for setting an operating temperature acquisition value and a frame rate acquisition value; acquiring a plurality of dark field images when the flat panel detector works at the working temperature acquisition value and the frame rate acquisition value; determining a gray level average map of the plurality of dark field images, and determining the gray level average map as a drift template corresponding to the operating temperature acquisition value and the frame rate acquisition value; the drift templates corresponding to the operating temperature acquisition values and the frame rate acquisition values are stored into the drift template library.
5. The drift correction device (300) for a flat panel detector according to claim 4, wherein,
the drift correction module (303) is configured to determine a gray value of a pixel in the X-ray image and a gray value of a corresponding pixel in the drift template; and subtracting the gray value of the corresponding pixel point in the drift template from the gray value of the pixel point in the X-ray image.
6. The drift correction device (300) for a flat panel detector according to claim 4, wherein,
the drift correction module (303) is configured to perform at least one of:
retrieving a drift template corresponding to the current frame rate value and the current operating temperature value from the drift template library arranged in the cloud;
retrieving a drift template corresponding to the current frame rate value and the current operating temperature value from the drift template library disposed in a workstation;
a drift template corresponding to the current frame rate value and the current operating temperature value is retrieved from a library of drift templates disposed in the flat panel detector.
7. A drift correction system (400) for a flat panel detector, comprising:
a flat panel detector (401);
a temperature sensor (402) for determining a current operating temperature value of the flat panel detector (401);
a drift template library (403) for storing a plurality of drift templates, each drift template corresponding to a respective frame rate value and a respective operating temperature value;
-a control host (404) for acquiring a current frame rate value of the flat panel detector (401), acquiring X-ray images acquired by the flat panel detector (401) at the current frame rate value and the current operating temperature value, retrieving a drift template corresponding to the current frame rate value and the current operating temperature value from the drift template library (403), and performing the drift correction method according to any of claims 1-3 on the X-ray images based on the retrieved drift template;
the flat panel detector is an amorphous selenium flat panel detector or an amorphous silicon flat panel detector in C-arm X-ray equipment.
8. The flat panel detector drift correction system (400) according to claim 7, wherein the flat panel detector (401) is a dynamic flat panel detector or a static flat panel detector.
9. Drift correction device (500) for flat panel detectors, characterized in that the device (500) comprises: a processor (501) and a memory (502);
the memory (502) has stored therein an application executable by the processor (501) for causing the processor (501) to perform the steps of the drift correction method of a flat panel detector as claimed in any one of claims 1 to 3.
10. A computer readable storage medium having stored therein computer readable instructions for performing the steps of the drift correction method of a flat panel detector according to any of claims 1 to 3.
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