WO2019105490A1 - 一种数字x射线放射系统、自动曝光控制方法及系统 - Google Patents

一种数字x射线放射系统、自动曝光控制方法及系统 Download PDF

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Publication number
WO2019105490A1
WO2019105490A1 PCT/CN2019/071254 CN2019071254W WO2019105490A1 WO 2019105490 A1 WO2019105490 A1 WO 2019105490A1 CN 2019071254 W CN2019071254 W CN 2019071254W WO 2019105490 A1 WO2019105490 A1 WO 2019105490A1
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Prior art keywords
exposure
main
flat panel
voltage generator
panel detector
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PCT/CN2019/071254
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English (en)
French (fr)
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郁凯峰
方志强
黄翌敏
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上海奕瑞光电子科技股份有限公司
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Publication of WO2019105490A1 publication Critical patent/WO2019105490A1/zh

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/44—Constructional features of apparatus for radiation diagnosis
    • A61B6/4411—Constructional features of apparatus for radiation diagnosis the apparatus being modular
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/54—Control of apparatus or devices for radiation diagnosis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/54—Control of apparatus or devices for radiation diagnosis
    • A61B6/542—Control of apparatus or devices for radiation diagnosis involving control of exposure

Definitions

  • This invention relates to digital X-ray radiation systems, and more particularly to a digital X-ray radiation system that automatically controls exposure.
  • the weight, thickness, and tissue density of the human body are different in the application scenario, if the same shooting dose is used in clinical use, it is bound to cause different images of different human bodies to be brighter and darker. If the difference in the gray value of the human body image is within a certain range, the operator needs to set the shooting dose according to the experience, so the quality of the captured image cannot be guaranteed. If the set dose is too low or too high, the captured image may not be used. Re-shooting is required, resulting in additional radiation.
  • the current DR system is usually equipped with an ionization chamber for controlling the dose of exposure.
  • the ionization chamber is placed between the human body and the flat panel detector for detecting the X-ray dose transmitted through the human body.
  • the system automatically shuts down.
  • the X-ray high voltage generator stops the exposure, thereby achieving the purpose of ensuring the gray value of the image.
  • Adding an ionization chamber to the DR system means increasing the manufacturing cost of the system.
  • the ionization chamber is at the front end of the flat panel detector, it is bound to generate ionization chamber artifacts in the imaging area, and the DR software is required to increase the ionization chamber correction algorithm.
  • the software complexity since the ionization chamber is at the front end of the flat panel detector, it is bound to generate ionization chamber artifacts in the imaging area, and the DR software is required to increase the ionization chamber correction algorithm. The software complexity.
  • an object of the present invention is to provide a digital X-ray radiation system, an automatic exposure control method and system for solving the inaccurate and acquired image exposure of the digital X-ray radiation system in the prior art.
  • the present invention provides an automatic exposure control method applied to a control device that communicates with a flat panel detector, an X-ray tube, and a high voltage generator.
  • the automatic exposure control method includes: after receiving an exposure request, generating a pre-exposure parameter, and transmitting the pre-exposure parameter to the high-voltage generator for the high-voltage generator to be according to the pre-exposure parameter Pre-exposure is performed; wherein the pre-exposure parameter comprises a pre-exposure X-ray dose; receiving a pre-exposure image acquired and transmitted by the flat panel detector, and acquiring a pre-exposure image gray value corresponding to the pre-exposure image; Deriving the pre-exposed image gray value, the pre-exposure X-ray dose, and the set main exposure image gray value, calculating a main exposure X-ray dose; and generating a main exposure parameter according to the main exposure X-ray dose, for providing
  • the high voltage generator performs a main exposure according to the main exposure parameter; where
  • the method further includes: after receiving the pre-exposure parameter setting completion information of the high-voltage generator response, transmitting a pre-exposure preparation request to the flat panel detector; wherein the pre-exposure parameter setting is completed
  • the information is generated by the high voltage generator after the pre-exposure parameter setting is completed according to the received pre-exposure parameter, and is generated and sent to the control device; after receiving the pre-exposure preparation completion information of the flat panel detector response,
  • the high voltage generator sends a pre-exposure request for the high voltage generator to pre-exposure according to the pre-exposure request and the pre-exposure parameter; wherein the pre-exposure preparation completion information is that the flat panel detector is according to the The pre-exposure preparation request is generated after the pre-exposure preparation is completed; after receiving the pre-exposure completion information of the high-voltage generator response, the pre-exposure image acquisition information is sent to the flat panel detector, so that the flat panel detector is Pre-exposure images are acquired.
  • the X-ray tube includes an anode, and after the high voltage generator completes the pre-exposure parameter setting and responds to the control device in response to the pre-exposure parameter setting completion information, The anode.
  • the flat panel detector performs a process of reducing the resolution of the preset pre-exposure image by a preset amplitude, and sends the processed pre-exposure image to the control device; or The flat panel detector transmits to the control device using a pre-exposure image of the original resolution.
  • the method further includes: after receiving the main exposure parameter setting completion information of the high voltage generator response, sending a main exposure preparation request to the flat panel detector; wherein the main exposure parameter setting is completed
  • the information is generated by the high voltage generator after the main exposure parameter is set according to the received main exposure parameter, and is generated and responded to the control device.
  • the main exposure preparation completion information is generated after the flat panel detector completes the main exposure preparation according to the main exposure preparation request; after receiving the main exposure completion information of the high voltage generator response, detecting the flat panel Transmitting the main exposure image acquisition information to enable the flat panel detector to collect the main exposure image; after receiving the main exposure image collected and transmitted by the flat panel detector, presetting the main exposure image Image Processing.
  • the present invention also provides an automatic exposure control system for use in a control device, a flat panel detector, an X-ray tube, and a high voltage generator.
  • the automatic exposure control system includes: a first exposure module, configured to generate a pre-exposure parameter after receiving an exposure request, and send the pre-exposure parameter to the high-voltage generator for the high voltage The pre-exposure is performed according to the pre-exposure parameter; wherein the pre-exposure parameter comprises a pre-exposure X-ray dose;
  • the first image acquisition module is configured to receive a pre-exposure image acquired and transmitted by the flat panel detector, and obtain a pre-exposure image gray value corresponding to the pre-exposure image;
  • a calculation module configured to calculate a main exposure X according to the pre-exposure image gray value, the pre-exposure X-ray dose, and the set main exposure image gray value a radiation dose;
  • a second exposure module configured to generate a main exposure parameter according to the main exposure X-ray dose, for
  • the first exposure module is further configured to: after receiving the pre-exposure parameter setting completion information of the high-voltage generator response, send a pre-exposure preparation request to the flat panel detector;
  • the pre-exposure parameter setting completion information is generated after the high-voltage generator completes the pre-exposure parameter setting according to the received pre-exposure parameter, and generates and responds to the control device; and receives the pre-exposure of the flat panel detector response
  • the flat panel detector is generated after the pre-exposure preparation request is completed according to the pre-exposure preparation request; after receiving the pre-exposure completion information of the high-voltage generator response, the pre-exposure image acquisition information is sent to the flat panel detector to The flat panel detector collects the pre-exposure image.
  • the X-ray tube includes an anode, and after the high voltage generator completes the pre-exposure parameter setting and responds to the control device in response to the pre-exposure parameter setting completion information, The anode.
  • the flat panel detector performs a process of reducing the resolution of the preset pre-exposure image by a preset amplitude, and sends the processed pre-exposure image to the control device; or The flat panel detector transmits to the control device using a pre-exposure image of the original resolution.
  • the second exposure module is further configured to: after receiving the main exposure parameter setting completion information of the high voltage generator response, send a main exposure preparation request to the flat panel detector;
  • the main exposure parameter setting completion information is generated after the high voltage generator completes the main exposure parameter setting according to the received main exposure parameter, and generates and responds to the control device; and receives the main exposure of the flat panel detector response
  • the main exposure preparation completion information is
  • the flat panel detector is generated after the main exposure preparation request is completed according to the main exposure preparation request; after receiving the main exposure completion information of the high voltage generator response, the main exposure image acquisition information is sent to the flat panel detector to make the
  • the flat panel detector collects the main exposure image;
  • the second image acquisition module is further configured to: receive the tablet After collection and transmission detector main exposure image, the main image exposure preset image processing.
  • the present invention also provides a control device having the automatic exposure control system of any of the above.
  • the present invention also provides a digital X-ray radiation system comprising a flat panel detector, an X-ray tube, a high voltage generator, and a control device as described above, the control device respectively A flat panel detector, the X-ray tube, and the high voltage generator are in communication, the X-ray tube being electrically coupled to the high voltage generator.
  • the digital X-ray radiation system, the automatic exposure control method and system of the present invention after receiving an exposure request, generate a pre-exposure parameter, and send the pre-exposure parameter to the high-voltage generator for The high voltage generator performs pre-exposure according to the pre-exposure parameter; wherein the pre-exposure parameter comprises a pre-exposure X-ray dose; receiving a pre-exposure image acquired and transmitted by the flat panel detector, and acquiring the pre-exposure image Corresponding pre-exposure image gray value; calculating a main exposure X-ray dose according to the pre-exposure image gray value, the pre-exposure X-ray dose, and the set main exposure image gray value; according to the main exposure X-ray a dose, generating a main exposure parameter for the high voltage generator to perform a main exposure according to the main exposure parameter; wherein the main exposure parameter comprises a main exposure X-ray dose; receiving the main collector to collect and transmit Exposure image.
  • the invention can automatically control the exposure process without installing an i
  • FIG. 1 is a flow chart showing the automatic exposure control method of the present invention in a specific embodiment.
  • FIG. 2 is a schematic view showing the composition of a digital X-ray radiation system of the present invention in a specific embodiment.
  • FIG. 3 is a flow chart showing the control flow of the automatic exposure control method of the present invention in a specific embodiment.
  • FIG. 4 is a schematic view showing the composition of an automatic exposure control system of the present invention in a specific embodiment.
  • the ionizing chamber is usually used to detect the X-ray dose after passing through the irradiated body.
  • the system automatically controls DR (Digital Radiography, direct digital flat panel X-ray imaging system).
  • DR Digital Radiography, direct digital flat panel X-ray imaging system.
  • the system's high-voltage generator stops exposing, thereby ensuring that the required image gray value is obtained while reducing the X-ray dose, while the DR system's ionization chamber costs are high, and the cost of the DR system is increased by synchronization.
  • the invention can obtain the X-ray dose parameter required for exposure by mathematical calculation through a digital AEC (Automatic Exposure Control) exposure process to ensure the consistency of the gray value of the image, thereby reducing the system cost and the system.
  • AEC Automatic Exposure Control
  • the old system that can be used in the non-ionization chamber can be upgraded into a system with digital AEC function, which can reduce the waste rate in clinical applications, reduce the generation of extra radiation and reduce the system cost.
  • the invention does not need any hardware synchronization signal between the flat panel detector and the high voltage generator, the exposure process is controlled by the DR system, and the exposure parameters are obtained by mathematical calculation, and the invention is realized as follows:
  • the exposure request process is initiated by the user.
  • the DR software controls the high voltage generator for a very low dose pre-exposure.
  • the DR software calculates the regional mean value after obtaining the pre-exposure image or calculates the dose required for normal exposure by other algorithms.
  • the DR software controls the high voltage generator for normal exposure.
  • the DR software acquires the normal exposure image and performs post processing to complete the current exposure process.
  • FIG. 1 is a flow chart showing the automatic exposure control method of the present invention in a specific embodiment.
  • the automatic exposure control method is applied to a control device, and as shown in FIG. 2, is a schematic diagram showing the composition of a digital X-ray radiation system of the present invention in a specific embodiment.
  • the control device 11 communicates with the flat panel detector 12, the X-ray tube 13 and the high voltage generator 14, and the control device 11, the flat panel detector 12, the X-ray tube 13 and the high voltage generator 14 constitute digital X-ray radiation.
  • System 1 is a flow chart showing the automatic exposure control method of the present invention in a specific embodiment.
  • the automatic exposure control method is applied to a control device, and as shown in FIG. 2, is a schematic diagram showing the composition of a digital X-ray radiation system of the present invention in a specific embodiment.
  • the control device 11 communicates with the flat panel detector 12, the X-ray tube 13 and the high voltage generator 14, and the control device 11, the flat panel detector 12, the X-ray tube 13 and the high
  • the automatic exposure control method includes:
  • Step S1 After receiving an exposure request, generate a pre-exposure parameter, and send the pre-exposure parameter to the high-voltage generator 14 for pre-exposure by the high-voltage generator 14 according to the pre-exposure parameter;
  • the pre-exposure parameter comprises a pre-exposure X-ray dose;
  • Step S2 receiving a pre-exposure image acquired and transmitted by the flat panel detector 12, and acquiring a pre-exposed image gray value corresponding to the pre-exposure image;
  • Step S3 calculating a main exposure X-ray dose according to the pre-exposure image gradation value, the pre-exposure X-ray dose, and the set main exposure image gradation value;
  • Step S4 generating a main exposure parameter according to the main exposure X-ray dose, for the high voltage generator 14 to perform main exposure according to the main exposure parameter; wherein the main exposure parameter comprises a main exposure X-ray dose;
  • Step S5 receiving a main exposure image collected and transmitted by the flat panel detector 12.
  • step S1 further includes:
  • the pre-exposure parameter setting completion information is the high-voltage generator 14 according to the receiving After the pre-exposure parameter completes the pre-exposure parameter setting, generates and responds to the control device 11;
  • pre-exposure preparation completion information After receiving the pre-exposure preparation completion information in response to the flat panel detector 12, transmitting a pre-exposure request to the high voltage generator 14 for the high voltage generator 14 to perform according to the pre-exposure request and the pre-exposure parameter.
  • Pre-exposure wherein the pre-exposure preparation completion information is generated after the flat panel detector 12 completes pre-exposure preparation according to the pre-exposure preparation request;
  • the pre-exposure image acquisition information is sent to the flat panel detector 12 to cause the flat panel detector 12 to collect the pre-exposure image.
  • the X-ray tube 13 includes an anode, and after the high voltage generator 14 completes the pre-exposure parameter setting and responds to the control device 11 in response to the pre-exposure parameter setting completion information, rotating the anode .
  • the purpose of performing the anode rotation at this time is to reduce the time of the exposure process, or to perform the anode rotation, and to perform the subsequent steps.
  • the X-ray tube 13 is a rotating anode X-ray tube, the rotating anode X-ray tube comprises an anode, a cathode and a glass tube, and the anode of the rotating anode X-ray tube comprises a target surface, a rotor, a rotating shaft and a bearing.
  • the rotating anode X-ray tube has a large power and a small focus, which reduces artifacts.
  • the flat panel detector 12 performs a process of reducing the resolution of the preset amplitude on the acquired pre-exposure image, and transmits the processed pre-exposure image to the control device 11.
  • the pre-exposure image may be sent after the snapshot is reduced, or may be sent after the multi-point value is combined, or calculated by other methods, and the same may be the original image transmission of the full resolution, and the resolution is reduced.
  • the goal is to reduce image transfer time and thus reduce the time for the entire exposure process.
  • the flat panel detector may also transmit to the control device using a pre-exposure image of the original resolution.
  • step S4 further includes:
  • the main exposure parameter setting completion information is the high voltage generator 14 according to the receiving After the main exposure parameter completes the setting of the main exposure parameter, generating and responding to the control device 11;
  • FIG. 3 there is shown a flow chart of the control of the automatic exposure control method of the present invention in a specific embodiment.
  • the control device 11 exists in the form of a DR workstation in this embodiment, and the DR workstation in FIG. 3 is described in the form of DR software.
  • Step (1) in the initial state, the flat panel detector, the high voltage generator, and the DR workstation are all in an idle state.
  • Step (2) when the user initiates the exposure process request (A), the DR software enters the pre-exposure parameter state of the set high voltage generator, and communicates with the high voltage generator to set the pre-exposure parameter (B).
  • Step (3) after the high-voltage generator parameter setting is completed, return to complete the response to the DR software (C), and start to rotate the anode to prepare (the purpose of the anode rotation at this time is to reduce the exposure process time, or not to rotate the anode, To be carried out in the next steps).
  • Step (4) After setting the pre-exposure parameters, the DR software sends the exposure request information to the flat panel detector to open the exposure preparation process (D) of the flat panel detector. Preferably, during the pre-exposure, it is not specified whether to perform the anode rotation of the X-ray tube or the flat panel detector exposure preparation flow first.
  • Step (5) after the tablet preparation is completed, send the response message to the DR software and wait for the exposure (E).
  • Step (6) After the DR software acquires the plate preparation completion information, if the X-ray tube has completed the anode rotation, the exposure information is sent to the high voltage generator (F), and if the anode rotation is not performed in the step (3), then Turn the prototype on and rotate.
  • Step (7) after the exposure is completed, the high voltage generator responds to the DR software (G), at which time the DR software sends a message to the flat panel detector to acquire the pre-exposure image (H).
  • Step (8) the flat panel detector collects the pre-exposure image and sends it to the DR software (I), the image may be sent after the snapshot is reduced, or may be sent after the multi-point value is combined, or sent by other methods.
  • the same can also be the full-resolution original image transmission, the purpose of sending the reduced resolution is to reduce the image transmission time, thereby reducing the time of the entire exposure process.
  • Step (9) after the DR software acquires the pre-exposure image, obtain the exposure dose to be set by calculating the gray value of the image required for the main exposure by calculating the gray value of the pre-exposure image, for example, the pre-exposure dose is x,
  • the obtained pre-exposed image has a gray value of y
  • the expected main exposure image has a gray value of u
  • the dose required for the main exposure is calculated according to x, y, u.
  • Step (10) after the DR software calculates the main exposure dose, sends a message to the high voltage generator to set the main exposure dose parameter (J).
  • the response information is sent to the DR software (K), and the anode rotation is started.
  • Step (12) after the DR software sets the exposure parameter, send the main exposure request to the flat panel detector to turn on the flat panel detector exposure preparation (L).
  • Step (13) after the flat panel detector is ready, send the response message to the DR software (M) and wait for the exposure.
  • Step (14) after receiving the response of the flat panel detector, the DR software sends an exposure request to the high voltage generator (N) to control the high voltage generator to start exposure.
  • step (15) the high voltage generator performs exposure according to the main exposure parameter set in step (10), and sends the completion information to the DR software (O) after completion.
  • the transmission of the pre-exposure image and the main exposure image may be transmitted in a plurality of image formats without limiting the image format.
  • the invention calculates the dose of X-rays required for obtaining the main exposure image through the pre-exposure image, and the entire exposure process requires two exposure shots, and does not require any hardware synchronization signal between the flat panel detector and the high voltage generator. And all synchronization mechanisms of the present invention are controlled by the DR software.
  • FIG. 4 there is shown a schematic diagram of the composition of an automatic exposure control system of the present invention in a particular embodiment.
  • the automatic exposure control system 2 is applied to the control device 11 as shown in FIG. 3, the automatic exposure control system 2 includes a first exposure module 21, a first image acquisition module 22, a calculation module 23, and a second exposure module. 24 and a second image acquisition module 25.
  • the first exposure module 21 is configured to generate a pre-exposure parameter after receiving an exposure request, and send the pre-exposure parameter to the high-voltage generator 14 for the high-voltage generator 14 to be according to the pre-exposure
  • the exposure parameter is pre-exposure; wherein the pre-exposure parameter comprises a pre-exposure X-ray dose;
  • the first image acquisition module 22 is configured to receive a pre-exposure image collected and transmitted by the flat panel detector 12, and acquire a grayscale value of the pre-exposure image corresponding to the pre-exposure image;
  • the calculating module 23 is configured to calculate a main exposure X-ray dose according to the pre-exposure image gray value, the pre-exposure X-ray dose, and the set main exposure image gray value;
  • the second exposure module 24 is configured to generate a main exposure parameter according to the main exposure X-ray dose, for the high voltage generator 14 to perform main exposure according to the main exposure parameter; wherein the main exposure parameter includes Main exposure X-ray dose;
  • the second image acquisition module 25 is configured to receive a main exposure image that is collected and transmitted by the flat panel detector 12.
  • first exposure module 21 is further configured to:
  • the pre-exposure parameter setting completion information is the high-voltage generator 14 according to the receiving After the pre-exposure parameter completes the pre-exposure parameter setting, generates and responds to the control device 11;
  • pre-exposure preparation completion information After receiving the pre-exposure preparation completion information in response to the flat panel detector 12, transmitting a pre-exposure request to the high voltage generator 14 for the high voltage generator 14 to perform according to the pre-exposure request and the pre-exposure parameter.
  • Pre-exposure wherein the pre-exposure preparation completion information is generated after the flat panel detector 12 completes pre-exposure preparation according to the pre-exposure preparation request;
  • the pre-exposure image acquisition information is sent to the flat panel detector 12 to cause the flat panel detector 12 to collect the pre-exposure image.
  • the X-ray tube 13 includes an anode, and after the high voltage generator 14 completes the pre-exposure parameter setting and responds to the control device 11 in response to the pre-exposure parameter setting completion information, rotating the anode .
  • the flat panel detector 11 performs a process of reducing the resolution of the preset amplitude on the acquired pre-exposure image, and sends the processed pre-exposure image to the control device; or the flat panel detector A pre-exposure image of the original resolution is transmitted to the control device.
  • the second exposure module 24 is further configured to:
  • the main exposure parameter setting completion information is the high voltage generator 14 according to the receiving After the main exposure parameter completes the setting of the main exposure parameter, generating and responding to the control device 11;
  • the second image acquisition module 25 is further configured to perform preset image processing on the main exposure image after receiving the main exposure image collected and transmitted by the flat panel detector 12.
  • the automatic exposure control system 2 is a system item corresponding to the automatic exposure control method, and the technical solutions of the two are corresponding one-to-one, and all descriptions about the automatic exposure control method can be applied to the embodiment, and Add a statement.
  • the digital X-ray radiation system, the automatic exposure control method and system of the present invention after receiving an exposure request, generate a pre-exposure parameter, and send the pre-exposure parameter to the high-voltage generator to Pre-exposure for the high-voltage generator according to the pre-exposure parameter; wherein the pre-exposure parameter comprises a pre-exposure X-ray dose; receiving a pre-exposure image acquired and transmitted by the flat panel detector, and acquiring the pre-exposure a pre-exposed image gray value corresponding to the image; calculating a main exposure X-ray dose according to the pre-exposure image gray value, the pre-exposure X-ray dose, and the set main exposure image gray value; according to the main exposure X a radiation dose, generating a main exposure parameter for the high voltage generator to perform a main exposure according to the main exposure parameter; wherein the main exposure parameter comprises a main exposure X-ray dose; receiving the flat panel detector for collecting and transmitting Main exposure image.
  • the pre-exposure parameter comprises a pre
  • the invention can automatically control the exposure process without installing an ionization chamber, and the exposure is accurate, the complexity is low, the system cost is reduced, the waste rate in clinical application can be reduced, and the generation of additional radiation can be reduced. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

Abstract

一种数字X射线放射系统（1）、自动曝光控制方法及系统（2），当接收到一曝光请求后，生成一预曝光参数，且向高压发生器（14）发送预曝光参数，以供高压发生器（14）根据预曝光参数进行预曝光；接收平板探测器（12）采集并发送的预曝光图像，且获取预曝光图像对应的预曝光图像灰度值；根据预曝光图像灰度值、预曝光X射线剂量以及设定的主曝光图像灰度值，计算获得主曝光X射线剂量；根据主曝光X射线剂量，生成一主曝光参数，以供高压发生器（14）根据主曝光参数进行主曝光；接收平板探测器（12）采集并发送的主曝光图像。该数字X射线放射系统（1）可自动化的控制曝光过程，且不需要安装电离室，曝光准确、复杂度低、降低系统成本，可降低临床应用中的废片率，减少额外辐射的产生。

Description

一种数字X射线放射系统、自动曝光控制方法及系统 技术领域
本发明涉及数字X射线放射系统，特别是涉及一种可自动控制曝光的数字X射线放射系统。
背景技术
目前的DR系统中，由于在应用场景中人体的体重，厚度，组织密度等不尽相同，在临床使用中如果使用同一拍摄剂量，势必会导致不同人体的拍摄图像亮暗不同，如果要保证不同人体拍摄图像的灰度值差异在一定范围之内，则需要操作人员根据经验设置拍摄剂量，所以无法保证拍摄的图像质量，设置的剂量过低或过高，均可能造成所拍摄的图像无法使用需要重新拍摄，从而导致额外的辐射产生。
所以目前DR系统中通常配置电离室，用于控制曝光的剂量，电离室放置在人体与平板探测器之间，用于探测透过人体的X射线剂量，当剂量达到一定数值时则系统自动关闭X射线高压发生器停止曝光，从而达到保证图像灰度值的目的。
在DR系统中增加电离室，意味着增加了系统的制造成本，同时由于电离室处于平板探测器的前端，所以势必会在成像区域产生电离室伪影，需要DR软件增加电离室校正算法，提升了软件复杂度。
发明内容
鉴于以上所述现有技术的缺点，本发明的目的在于提供一种数字X射线放射系统、自动曝光控制方法及系统，用于解决现有技术中数字X射线放射系统图像曝光不准确、获取的图像的质量不均匀且运行成本高、系统复杂度高等的问题。
为实现上述目的及其他相关目的，本发明提供一种自动曝光控制方法，所述自动曝光控制方法应用于一控制设备中，所述控制设备与平板探测器、X射线球管以及高压发生器通信，所述自动曝光控制方法包括：当接收到一曝光请求后，生成一预曝光参数，且向所述高压发生器发送所述预曝光参数，以供所述高压发生器根据所述预曝光参数进行预曝光；其中，所述预曝光参数包括预曝光X射线剂量；接收所述平板探测器采集并发送的预曝光图像，且获取所述预曝光图像对应的预曝光图像灰度值；根据所述预曝光图像灰度值、预曝光X射线剂量以及设定的主曝光图像灰度值，计算获得主曝光X射线剂量；根据所述主曝光X射线剂量，生成一主曝光参数，以供所述高压发生器根据所述主曝光参数进行主曝光；其中，所述主曝 光参数包括主曝光X射线剂量；接收所述平板探测器采集并发送的主曝光图像。
于本发明一具体实施例中，还包括：接收到所述高压发生器响应的预曝光参数设置完成信息后，向所述平板探测器发送预曝光准备请求；其中，所述预曝光参数设置完成信息为所述高压发生器根据接收的所述预曝光参数完成预曝光参数设置后，生成并向所述控制设备响应的；接收到所述平板探测器响应的预曝光准备完成信息后，向所述高压发生器发送预曝光请求，以供所述高压发生器根据所述预曝光请求以及所述预曝光参数进行预曝光；其中，所述预曝光准备完成信息为所述平板探测器根据所述预曝光准备请求完成预曝光准备后生成的；接收到所述高压发生器响应的预曝光完成信息后，向所述平板探测器发送预曝光图像采集信息，以令所述平板探测器对所述预曝光图像进行采集。
于本发明一具体实施例中，所述X射线球管包括阳极，且在所述高压发生器完成所述预曝光参数设置并向所述控制设备响应所述预曝光参数设置完成信息后，旋转所述阳极。
于本发明一具体实施例中，所述平板探测器对采集的预曝光图像进行预设幅度的降低分辨率的处理，且将处理后的所述预曝光图像向所述控制设备发送；或者，所述平板探测器采用原始分辨率的预曝光图像向所述控制设备发送。
于本发明一具体实施例中，还包括：接收到所述高压发生器响应的主曝光参数设置完成信息后，向所述平板探测器发送主曝光准备请求；其中，所述主曝光参数设置完成信息为所述高压发生器根据接收的所述主曝光参数完成主曝光参数设置后，生成并向所述控制设备响应的。接收到所述平板探测器响应的主曝光准备完成信息后，向所述高压发生器发送主曝光请求，以供所述高压发生器根据所述主曝光请求以及所述主曝光参数进行主曝光；其中，所述主曝光准备完成信息为所述平板探测器根据所述主曝光准备请求完成主曝光准备后生成的；接收到所述高压发生器响应的主曝光完成信息后，向所述平板探测器发送主曝光图像采集信息，以令所述平板探测器对所述主曝光图像进行采集；接收到所述平板探测器采集并发送的主曝光图像后，对所述主曝光图像进行预设的图像处理。
为实现上述目的及其他相关目的，本发明还提供一种自动曝光控制系统，所述自动曝光控制系统应用于一控制设备中，所述控制设备与平板探测器、X射线球管以及高压发生器通信，所述自动曝光控制系统包括：第一曝光模块，用以当接收到一曝光请求后，生成一预曝光参数，且向所述高压发生器发送所述预曝光参数，以供所述高压发生器根据所述预曝光参数进行预曝光；其中，所述预曝光参数包括预曝光X射线剂量；第一图像采集模块，用以接收所述平板探测器采集并发送的预曝光图像，且获取所述预曝光图像对应的预曝光图像灰度值；计算模块，用以根据所述预曝光图像灰度值、预曝光X射线剂量以及设定的主曝光图像 灰度值，计算获得主曝光X射线剂量；第二曝光模块，用以根据所述主曝光X射线剂量，生成一主曝光参数，以供所述高压发生器根据所述主曝光参数进行主曝光；其中，所述主曝光参数包括主曝光X射线剂量；第二图像采集模块，用以接收所述平板探测器采集并发送的主曝光图像。
于本发明一具体实施例中，所述第一曝光模块还用以：接收到所述高压发生器响应的预曝光参数设置完成信息后，向所述平板探测器发送预曝光准备请求；其中，所述预曝光参数设置完成信息为所述高压发生器根据接收的所述预曝光参数完成预曝光参数设置后，生成并向所述控制设备响应的；接收到所述平板探测器响应的预曝光准备完成信息后，向所述高压发生器发送预曝光请求，以供所述高压发生器根据所述预曝光请求以及所述预曝光参数进行预曝光；其中，所述预曝光准备完成信息为所述平板探测器根据所述预曝光准备请求完成预曝光准备后生成的；接收到所述高压发生器响应的预曝光完成信息后，向所述平板探测器发送预曝光图像采集信息，以令所述平板探测器对所述预曝光图像进行采集。
于本发明一具体实施例中，所述X射线球管包括阳极，且在所述高压发生器完成所述预曝光参数设置并向所述控制设备响应所述预曝光参数设置完成信息后，旋转所述阳极。
于本发明一具体实施例中，所述平板探测器对采集的预曝光图像进行预设幅度的降低分辨率的处理，且将处理后的所述预曝光图像向所述控制设备发送；或者，所述平板探测器采用原始分辨率的预曝光图像向所述控制设备发送。
于本发明一具体实施例中，所述第二曝光模块还用以：接收到所述高压发生器响应的主曝光参数设置完成信息后，向所述平板探测器发送主曝光准备请求；其中，所述主曝光参数设置完成信息为所述高压发生器根据接收的所述主曝光参数完成主曝光参数设置后，生成并向所述控制设备响应的；接收到所述平板探测器响应的主曝光准备完成信息后，向所述高压发生器发送主曝光请求，以供所述高压发生器根据所述主曝光请求以及所述主曝光参数进行主曝光；其中，所述主曝光准备完成信息为所述平板探测器根据所述主曝光准备请求完成主曝光准备后生成的；接收到所述高压发生器响应的主曝光完成信息后，向所述平板探测器发送主曝光图像采集信息，以令所述平板探测器对所述主曝光图像进行采集；所述第二图像采集模块还用以：在接收到所述平板探测器采集并发送的主曝光图像后，对所述主曝光图像进行预设的图像处理。
为实现上述目的及其他相关目的，本发明还提供一种控制设备，具有如上任一项所述的自动曝光控制系统。
为实现上述目的及其他相关目的，本发明还提供一种数字X射线放射系统，包括平板探 测器、X射线球管、高压发生器以及如上所述的控制设备，所述控制设备分别与所述平板探测器、所述X射线球管以及所述高压发生器通信，所述X射线球管与所述高压发生器电连接。
如上所述，本发明的数字X射线放射系统、自动曝光控制方法及系统，当接收到一曝光请求后，生成一预曝光参数，且向所述高压发生器发送所述预曝光参数，以供所述高压发生器根据所述预曝光参数进行预曝光；其中，所述预曝光参数包括预曝光X射线剂量；接收所述平板探测器采集并发送的预曝光图像，且获取所述预曝光图像对应的预曝光图像灰度值；根据所述预曝光图像灰度值、预曝光X射线剂量以及设定的主曝光图像灰度值，计算获得主曝光X射线剂量；根据所述主曝光X射线剂量，生成一主曝光参数，以供所述高压发生器根据所述主曝光参数进行主曝光；其中，所述主曝光参数包括主曝光X射线剂量；接收所述平板探测器采集并发送的主曝光图像。本发明可自动化的控制曝光过程，且不需要安装电离室，曝光准确、复杂度低、降低系统成本，可降低临床应用中的废片率，减少额外辐射的产生。
附图说明
图1显示为本发明的自动曝光控制方法在一具体实施例中的流程示意图。
图2显示为本发明的数字X射线放射系统在一具体实施例中的组成示意图。
图3显示为本发明的自动曝光控制方法在一具体实施例中的控制流程示意图。
图4显示为本发明的自动曝光控制系统在一具体实施例中的组成示意图。
元件标号说明
1        数字X射线放射系统
11       控制设备
12       平板探测器
13       X射线球管
14       高压发生器
2        自动曝光控制系统
21       第一曝光模块
22       第一图像采集模块
23       计算模块
24       第二曝光模块
25       第二图像采集模块
S1～S5    步骤
具体实施方式
以下通过特定的具体实例说明本发明的实施方式，本领域技术人员可由本说明书所揭露的内容轻易地了解本发明的其他优点与功效。本发明还可以通过另外不同的具体实施方式加以实施或应用，本说明书中的各项细节也可以基于不同观点与应用，在没有背离本发明的精神下进行各种修饰或改变。需说明的是，在不冲突的情况下，以下实施例及实施例中的特征可以相互组合。
需要说明的是，以下实施例中所提供的图示仅以示意方式说明本发明的基本构想，遂图示中仅显示与本发明中有关的组件而非按照实际实施时的组件数目、形状及尺寸绘制，其实际实施时各组件的型态、数量及比例可为一种随意的改变，且其组件布局型态也可能更为复杂。
在数字x射线平板探测器的应用领域，在临床应用中，通常需要操作人员根据经验设置曝光参数，而由于被照射体(一般为人体)由于重量，组织密度的不同，需要的X射线照射剂量也稍有差异。
目前临床应用中，通常使用电离室在检测透过被照射体后的X射线剂量，当检测到的X射线达到一定剂量后，则系统自动控制DR(Digital Radiography，直接数字平板X射线成像系统)系统的高压发生器停止曝光，从而保证获取需要的图像灰度值的同时，降低X射线剂量，同时DR系统的电离室成本较高，同步造成DR系统的成本上升。
本发明可通过一种数字的AEC(Automatic Exposure Control，自动曝光控制)曝光流程，通过数学计算获取曝光所需的X射线剂量参数来保证图像灰度值的一致性，从而达到降低系统成本以及系统复杂度的目的，同时可用于无电离室的老旧系统升级改造成带有数字AEC功能的系统，同时可降低临床应用中的废片率，减少额外辐射的产生，降低系统成本。
本发明无需平板探测器与高压发生器之间有任何硬件同步信号，由DR系统控制该曝光流程，通过数学计算来获取曝光参数，本发明是这样实现的：
1).由用户发起曝光请求流程。
2).DR软件控制高压发生器进行一次极低剂量的预曝光。
3).DR软件通过获取预曝光图像后计算区域均值或通过其他算法计算获得正常曝光所需要的剂量。
4).DR软件控制高压发生器进行正常曝光。
5).DR软件获取正常曝光图像并进行后处理，完成当前曝光流程。
具体的，请参阅图1，显示为本发明的自动曝光控制方法在一具体实施例中的流程示意图。所述自动曝光控制方法应用于一控制设备中，且如图2所示，显示为本发明的数字X射线放射系统在一具体实施例中的组成示意图。所述控制设备11与平板探测器12、X射线球管13以及高压发生器14通信，且所述控制设备11、平板探测器12、X射线球管13以及高压发生器14组成数字X射线放射系统1。
如图1，所述自动曝光控制方法包括：
步骤S1：当接收到一曝光请求后，生成一预曝光参数，且向所述高压发生器14发送所述预曝光参数，以供所述高压发生器14根据所述预曝光参数进行预曝光；其中，所述预曝光参数包括预曝光X射线剂量；
步骤S2：接收所述平板探测器12采集并发送的预曝光图像，且获取所述预曝光图像对应的预曝光图像灰度值；
步骤S3：根据所述预曝光图像灰度值、预曝光X射线剂量以及设定的主曝光图像灰度值，计算获得主曝光X射线剂量；
步骤S4：根据所述主曝光X射线剂量，生成一主曝光参数，以供所述高压发生器14根据所述主曝光参数进行主曝光；其中，所述主曝光参数包括主曝光X射线剂量；
步骤S5：接收所述平板探测器12采集并发送的主曝光图像。
进一步的，所述步骤S1还包括：
接收到所述高压发生器14响应的预曝光参数设置完成信息后，向所述平板探测器12发送预曝光准备请求；其中，所述预曝光参数设置完成信息为所述高压发生器14根据接收的所述预曝光参数完成预曝光参数设置后，生成并向所述控制设备11响应的；
接收到所述平板探测器12响应的预曝光准备完成信息后，向所述高压发生器14发送预曝光请求，以供所述高压发生器14根据所述预曝光请求以及所述预曝光参数进行预曝光；其中，所述预曝光准备完成信息为所述平板探测器12根据所述预曝光准备请求完成预曝光准备后生成的；
接收到所述高压发生器14响应的预曝光完成信息后，向所述平板探测器12发送预曝光图像采集信息，以令所述平板探测器12对所述预曝光图像进行采集。
进一步的，所述X射线球管13包括阳极，且在所述高压发生器14完成所述预曝光参数设置并向所述控制设备11响应所述预曝光参数设置完成信息后，旋转所述阳极。此时进行阳极旋转的目的是减少曝光流程的时间，也可不进行阳极旋转，待后续步骤中进行。其中，X 射线球管13为旋转阳极X射线球管，旋转阳极X射线球管包括阳极、阴极和玻璃管，旋转阳极X射线球管的阳极包括靶面、转子、转轴和轴承。旋转阳极X射线球管的功率大且焦点小，这样可以减少伪影。
进一步的，所述平板探测器12对采集的预曝光图像进行预设幅度的降低分辨率的处理，且将处理后的所述预曝光图像向所述控制设备11发送。该预曝光图像可以是抽点后降低分辨率发送，也可以是多点数值合并后发送，或通过其他方式计算后发送，同样的也可以是全分辨率的原始图像发送，降低分辨率后发送的目的是减少图像传输时间，从而减少整个曝光流程的时间。或者，所述平板探测器也可以采用原始分辨率的预曝光图像向所述控制设备发送。
进一步的，所述步骤S4还包括：
接收到所述高压发生器14响应的主曝光参数设置完成信息后，向所述平板探测器12发送主曝光准备请求；其中，所述主曝光参数设置完成信息为所述高压发生器14根据接收的所述主曝光参数完成主曝光参数设置后，生成并向所述控制设备11响应的；
接收到所述平板探测器12响应的主曝光准备完成信息后，向所述高压发生器14发送主曝光请求，以供所述高压发生器14根据所述主曝光请求以及所述主曝光参数进行主曝光；其中，所述主曝光准备完成信息为所述平板探测器12根据所述主曝光准备请求完成主曝光准备后生成的；
接收到所述高压发生器14响应的主曝光完成信息后，向所述平板探测器12发送主曝光图像采集信息，以令所述平板探测器12对所述主曝光图像进行采集；
接收到所述平板探测器12采集并发送的主曝光图像后，对所述主曝光图像进行预设的图像处理。
进一步参阅图3，显示为本发明的自动曝光控制方法在一具体实施例中的控制流程示意图。如图3，所述控制设备11于本实施例中以DR工作站的形式存在，且图3中所述DR工作站以DR软件的形式进行描述。
步骤(1)、在起始状态，平板探测器，高压发生器，DR工作站均处于空闲状态。
步骤(2)、当用户发起曝光流程请求后(A)，DR软件进入设置高压发生器的预曝光参数状态，并与高压发生器通讯进行预曝光参数的设置(B)。
步骤(3)、高压发生器参数设置完毕后，返回完成响应至DR软件(C)，并开始旋转阳极进行准备(此时进行阳极旋转的目的是减少曝光流程的时间，也可不进行阳极旋转，待后续步骤中进行)。
步骤(4)、设置完预曝光参数后，DR软件发送曝光请求信息至平板探测器，开启平板 探测器的曝光准备流程(D)。优选的，在该预曝光期间，不规定是否先进行X射线球管的阳极旋转还是先开启平板探测器曝光准备流程。
步骤(5)、平板准备完成后，发送响应信息至DR软件，并等待曝光(E)。
步骤(6)、DR软件获取平板准备完成信息后，若X射线球管已完成阳极旋转，则发送曝光信息至高压发生器(F)，若步骤(3)中未进行阳极旋转，则此时开启样机旋转并曝光。
步骤(7)、曝光完成后，高压发生器响应DR软件(G)，此时DR软件发送信息至平板探测器采集预曝光图像(H)。
步骤(8)、平板探测器采集预曝光图像并发送至DR软件(I)，该图像可以是抽点后降低分辨率发送，也可以是多点数值合并后发送，或通过其他方式计算后发送，同样的也可以是全分辨率的原始图像发送，降低分辨率后发送的目的是减少图像传输时间，从而减少整个曝光流程的时间。
步骤(9)、DR软件获取预曝光图像后，通过计算预曝光图像的灰度值，获取对应的主曝光需要的图像的灰度值所应进行设置的曝光剂量，例如预曝光剂量为x，得到的预曝光图像灰度值为y，而预期的主曝光图像灰度值为u，则根据x，y，u计算得出主曝光所需要的剂量。
步骤(10)、DR软件计算获取主曝光剂量后，发送信息至高压发生器设置主曝光剂量参数(J)。
步骤(11)、高压发生器完成设置后，发送响应信息至DR软件(K)，并开始阳极旋转。
步骤(12)、DR软件设置曝光参数完成后，发送主曝光请求至平板探测器，开启平板探测器曝光准备(L)。
步骤(13)、平板探测器准备完成后，发送响应信息至DR软件(M)，并等待曝光。
步骤(14)、DR软件接收到平板探测器的响应后，发送曝光请求至高压发生器(N)，控制高压发生器开始曝光。
步骤(15)、高压发生器根据步骤(10)设置的主曝光参数进行曝光，完成后发送完成信息至DR软件(O)。
步骤(16)、DR软件接收到高压发生器的响应信息后，发送图像采集请求至平板探测器(P)，获取主曝光图像。
步骤(17)、平板探测器收到主曝光图像采集请求后，采集图像并按照全分辨率发送至DR软件(Q)。优选的，在主曝光期间，不规定是否先进行X射线球管的阳极旋转还是先开启平板探测器曝光准备流程。
步骤(18)、DR软件获取平板探测器的主曝光全分辨率图像后，进行图像后处理并完成整个AEC曝光流程。此时高压发生器，平板探测器，DR软件均返回值空闲状态，等待下一次用户开启的曝光请求。优选的，预曝光图像和主曝光图像的发送，可以以多种图像格式进行发送，不对图像格式进行限定。
优选的，以上高压发生器，平板探测器，DR软件之间的信息通讯格式可以有多种，在本实施例中不做格式或者协议的限定。
本发明通过预曝光的图像计算获取主曝光图像需要的X射线的剂量，整个曝光流程需要进行2次曝光拍摄，且无需平板探测器与高压发生器有任何的硬件同步信号。且本发明的所有同步机制由DR软件控制。
进一步参阅图4，显示为本发明的自动曝光控制系统在一具体实施例中的组成示意图。所述自动曝光控制系统2，应用于如图3所示的控制设备11中，所述自动曝光控制系统2包括第一曝光模块21、第一图像采集模块22、计算模块23、第二曝光模块24以及第二图像采集模块25。
所述第一曝光模块21用以当接收到一曝光请求后，生成一预曝光参数，且向所述高压发生器14发送所述预曝光参数，以供所述高压发生器14根据所述预曝光参数进行预曝光；其中，所述预曝光参数包括预曝光X射线剂量；
所述第一图像采集模块22用以接收所述平板探测器12采集并发送的预曝光图像，且获取所述预曝光图像对应的预曝光图像灰度值；
所述计算模块23用以根据所述预曝光图像灰度值、预曝光X射线剂量以及设定的主曝光图像灰度值，计算获得主曝光X射线剂量；
所述第二曝光模块24用以根据所述主曝光X射线剂量，生成一主曝光参数，以供所述高压发生器14根据所述主曝光参数进行主曝光；其中，所述主曝光参数包括主曝光X射线剂量；
所述第二图像采集模块25用以接收所述平板探测器12采集并发送的主曝光图像。
进一步的，所述第一曝光模块21还用以：
接收到所述高压发生器14响应的预曝光参数设置完成信息后，向所述平板探测器12发送预曝光准备请求；其中，所述预曝光参数设置完成信息为所述高压发生器14根据接收的所述预曝光参数完成预曝光参数设置后，生成并向所述控制设备11响应的；
接收到所述平板探测器12响应的预曝光准备完成信息后，向所述高压发生器14发送预曝光请求，以供所述高压发生器14根据所述预曝光请求以及所述预曝光参数进行预曝光；其 中，所述预曝光准备完成信息为所述平板探测器12根据所述预曝光准备请求完成预曝光准备后生成的；
接收到所述高压发生器14响应的预曝光完成信息后，向所述平板探测器12发送预曝光图像采集信息，以令所述平板探测器12对所述预曝光图像进行采集。
进一步的，所述X射线球管13包括阳极，且在所述高压发生器14完成所述预曝光参数设置并向所述控制设备11响应所述预曝光参数设置完成信息后，旋转所述阳极。
进一步的，所述平板探测器11对采集的预曝光图像进行预设幅度的降低分辨率的处理，且将处理后的所述预曝光图像向所述控制设备发送；或者，所述平板探测器采用原始分辨率的预曝光图像向所述控制设备发送。
进一步的，所述第二曝光模块24还用以：
接收到所述高压发生器14响应的主曝光参数设置完成信息后，向所述平板探测器12发送主曝光准备请求；其中，所述主曝光参数设置完成信息为所述高压发生器14根据接收的所述主曝光参数完成主曝光参数设置后，生成并向所述控制设备11响应的；
接收到所述平板探测器12响应的主曝光准备完成信息后，向所述高压发生器14发送主曝光请求，以供所述高压发生器14根据所述主曝光请求以及所述主曝光参数进行主曝光；其中，所述主曝光准备完成信息为所述平板探测器12根据所述主曝光准备请求完成主曝光准备后生成的；
接收到所述高压发生器14响应的主曝光完成信息后，向所述平板探测器12发送主曝光图像采集信息，以令所述平板探测器12对所述主曝光图像进行采集；
所述第二图像采集模块25还用以：在接收到所述平板探测器12采集并发送的主曝光图像后，对所述主曝光图像进行预设的图像处理。
所述自动曝光控制系统2为与所述自动曝光控制方法对应的系统项，两者技术方案一一对应，所有关于所述自动曝光控制方法的描述均可应用于本实施例中，在此不加赘述。
综上所述，本发明的数字X射线放射系统、自动曝光控制方法及系统，当接收到一曝光请求后，生成一预曝光参数，且向所述高压发生器发送所述预曝光参数，以供所述高压发生器根据所述预曝光参数进行预曝光；其中，所述预曝光参数包括预曝光X射线剂量；接收所述平板探测器采集并发送的预曝光图像，且获取所述预曝光图像对应的预曝光图像灰度值；根据所述预曝光图像灰度值、预曝光X射线剂量以及设定的主曝光图像灰度值，计算获得主曝光X射线剂量；根据所述主曝光X射线剂量，生成一主曝光参数，以供所述高压发生器根据所述主曝光参数进行主曝光；其中，所述主曝光参数包括主曝光X射线剂量；接收所述平 板探测器采集并发送的主曝光图像。本发明可自动化的控制曝光过程，且不需要安装电离室，曝光准确、复杂度低、降低系统成本，可降低临床应用中的废片率，减少额外辐射的产生。所以，本发明有效克服了现有技术中的种种缺点而具高度产业利用价值。
上述实施例仅例示性说明本发明的原理及其功效，而非用于限制本发明。任何熟悉此技术的人士皆可在不违背本发明的精神及范畴下，对上述实施例进行修饰或改变。因此，举凡所属技术领域中具有通常知识者在未脱离本发明所揭示的精神与技术思想下所完成的一切等效修饰或改变，仍应由本发明的权利要求所涵盖。

Claims (12)

  1. 一种自动曝光控制方法，其特征在于，所述自动曝光控制方法应用于一控制设备中，所述控制设备与平板探测器、X射线球管以及高压发生器通信，所述自动曝光控制方法包括：
    当接收到一曝光请求后，生成一预曝光参数，且向所述高压发生器发送所述预曝光参数，以供所述高压发生器根据所述预曝光参数进行预曝光；其中，所述预曝光参数包括预曝光X射线剂量；
    接收所述平板探测器采集并发送的预曝光图像，且获取所述预曝光图像对应的预曝光图像灰度值；
    根据所述预曝光图像灰度值、预曝光X射线剂量以及设定的主曝光图像灰度值，计算获得主曝光X射线剂量；
    根据所述主曝光X射线剂量，生成一主曝光参数，以供所述高压发生器根据所述主曝光参数进行主曝光；其中，所述主曝光参数包括主曝光X射线剂量；
    接收所述平板探测器采集并发送的主曝光图像。
  2. 根据权利要求1所述的自动曝光控制方法，其特征在于：还包括：
    接收到所述高压发生器响应的预曝光参数设置完成信息后，向所述平板探测器发送预曝光准备请求；其中，所述预曝光参数设置完成信息为所述高压发生器根据接收的所述预曝光参数完成预曝光参数设置后，生成并向所述控制设备响应的；
    接收到所述平板探测器响应的预曝光准备完成信息后，向所述高压发生器发送预曝光请求，以供所述高压发生器根据所述预曝光请求以及所述预曝光参数进行预曝光；其中，所述预曝光准备完成信息为所述平板探测器根据所述预曝光准备请求完成预曝光准备后生成的；
    接收到所述高压发生器响应的预曝光完成信息后，向所述平板探测器发送预曝光图像采集信息，以令所述平板探测器对所述预曝光图像进行采集。
  3. 根据权利要求2所述的自动曝光控制方法，其特征在于：所述X射线球管包括阳极，且在所述高压发生器完成所述预曝光参数设置并向所述控制设备响应所述预曝光参数设置完成信息后，旋转所述阳极。
  4. 根据权利要求1所述的自动曝光控制方法，其特征在于：所述平板探测器对采集的预曝光图像进行预设幅度的降低分辨率的处理，且将处理后的所述预曝光图像向所述控制设备发送；或者，所述平板探测器采用原始分辨率的预曝光图像向所述控制设备发送。
  5. 根据权利要求1所述的自动曝光控制方法，其特征在于：还包括：
    接收到所述高压发生器响应的主曝光参数设置完成信息后，向所述平板探测器发送主曝光准备请求；其中，所述主曝光参数设置完成信息为所述高压发生器根据接收的所述主曝光参数完成主曝光参数设置后，生成并向所述控制设备响应的；
    接收到所述平板探测器响应的主曝光准备完成信息后，向所述高压发生器发送主曝光请求，以供所述高压发生器根据所述主曝光请求以及所述主曝光参数进行主曝光；其中，所述主曝光准备完成信息为所述平板探测器根据所述主曝光准备请求完成主曝光准备后生成的；
    接收到所述高压发生器响应的主曝光完成信息后，向所述平板探测器发送主曝光图像采集信息，以令所述平板探测器对所述主曝光图像进行采集；
    接收到所述平板探测器采集并发送的主曝光图像后，对所述主曝光图像进行预设的图像处理。
  6. 一种自动曝光控制系统，其特征在于，所述自动曝光控制系统应用于一控制设备中，所述控制设备与平板探测器、X射线球管以及高压发生器通信，所述自动曝光控制系统包括：
    第一曝光模块，用以当接收到一曝光请求后，生成一预曝光参数，且向所述高压发生器发送所述预曝光参数，以供所述高压发生器根据所述预曝光参数进行预曝光；其中，所述预曝光参数包括预曝光X射线剂量；
    第一图像采集模块，用以接收所述平板探测器采集并发送的预曝光图像，且获取所述预曝光图像对应的预曝光图像灰度值；
    计算模块，用以根据所述预曝光图像灰度值、预曝光X射线剂量以及设定的主曝光图像灰度值，计算获得主曝光X射线剂量；
    第二曝光模块，用以根据所述主曝光X射线剂量，生成一主曝光参数，以供所述高压发生器根据所述主曝光参数进行主曝光；其中，所述主曝光参数包括主曝光X射线剂量；
    第二图像采集模块，用以接收所述平板探测器采集并发送的主曝光图像。
  7. 根据权利要求6所述的自动曝光控制系统，其特征在于：所述第一曝光模块还用以：
    接收到所述高压发生器响应的预曝光参数设置完成信息后，向所述平板探测器发送预曝光准备请求；其中，所述预曝光参数设置完成信息为所述高压发生器根据接收的所述预曝光参数完成预曝光参数设置后，生成并向所述控制设备响应的；
    接收到所述平板探测器响应的预曝光准备完成信息后，向所述高压发生器发送预曝光请求，以供所述高压发生器根据所述预曝光请求以及所述预曝光参数进行预曝光；其中，所述预曝光准备完成信息为所述平板探测器根据所述预曝光准备请求完成预曝光准备后生成的；
    接收到所述高压发生器响应的预曝光完成信息后，向所述平板探测器发送预曝光图像采集信息，以令所述平板探测器对所述预曝光图像进行采集。
  8. 根据权利要求7所述的自动曝光控制系统，其特征在于：所述X射线球管包括阳极，且在所述高压发生器完成所述预曝光参数设置并向所述控制设备响应所述预曝光参数设置完成信息后，旋转所述阳极。
  9. 根据权利要求6所述的自动曝光控制系统，其特征在于：所述平板探测器对采集的预曝光图像进行预设幅度的降低分辨率的处理，且将处理后的所述预曝光图像向所述控制设备发送；或者，所述平板探测器采用原始分辨率的预曝光图像向所述控制设备发送。
  10. 根据权利要求6所述的自动曝光控制系统，其特征在于：
    所述第二曝光模块还用以：
    接收到所述高压发生器响应的主曝光参数设置完成信息后，向所述平板探测器发送主曝光准备请求；其中，所述主曝光参数设置完成信息为所述高压发生器根据接收的所述主曝光参数完成主曝光参数设置后，生成并向所述控制设备响应的；
    接收到所述平板探测器响应的主曝光准备完成信息后，向所述高压发生器发送主曝光请求，以供所述高压发生器根据所述主曝光请求以及所述主曝光参数进行主曝光；其中，所述主曝光准备完成信息为所述平板探测器根据所述主曝光准备请求完成主曝光准备后生成的；
    接收到所述高压发生器响应的主曝光完成信息后，向所述平板探测器发送主曝光图像采集信息，以令所述平板探测器对所述主曝光图像进行采集；
    所述第二图像采集模块还用以：
    在接收到所述平板探测器采集并发送的主曝光图像后，对所述主曝光图像进行预设的图像处理。
  11. 一种控制设备，其特征在于：具有如权利要求6～10中任一项所述的自动曝光控制系统。
  12. 一种数字X射线放射系统，其特征在于：包括平板探测器、X射线球管、高压发生器以及如权利要求11所述的控制设备，所述控制设备分别与所述平板探测器、所述X射线球管以及所述高压发生器通信，所述X射线球管与所述高压发生器电连接。
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