CN116963802A

CN116963802A - Image acquisition system, control method thereof and radiotherapy system

Info

Publication number: CN116963802A
Application number: CN202180095214.XA
Authority: CN
Inventors: 赵文亮; 张生林
Original assignee: Our United Corp
Current assignee: Our United Corp
Priority date: 2021-04-01
Filing date: 2021-04-01
Publication date: 2023-10-27
Also published as: WO2022205292A1

Abstract

An image acquisition system comprises a rotating body, an X-ray generating device and a detector which are arranged on the rotating body, a high-voltage generator, an exposure controller and a motion control device. Wherein the X-ray generating device is configured to emit X-rays. The detector is configured to receive the X-rays and generate a projection image. The high voltage generator is configured to supply a high voltage to the X-ray generating device to cause the X-ray generating device to perform a plurality of exposures and generate a plurality of exposure signals. The exposure controller is configured to sequentially acquire a plurality of exposure signals from the high-voltage generator, and sequentially transmit the plurality of exposure signals to the motion control device, each of the exposure signals being for indicating an exposure time when the X-ray generation device generates an exposure. The motion control device is configured to sequentially acquire a plurality of exposure signals from the exposure controller, and acquire rotation angles of the rotating body corresponding to each exposure time, each rotation angle corresponding to a projection image generated by the detector at the corresponding exposure time.

Description

Image acquisition system, control method thereof and radiotherapy system

Technical Field

The disclosure relates to the technical field of radiotherapy, in particular to an image acquisition system, a control method thereof and a radiotherapy system.

Background

With the development of computer and image technologies, radiation therapy technologies are also becoming mature, and include, for example, three-dimensional conformal radiation therapy (3-Dimensional conformal radiation therapy, abbreviated as 3 DCRT), intensity modulated radiation therapy (Intensity Modulated Radiation Therapy, abbreviated as IMRT), image guided radiation therapy (Image Guided Radiation Therapy, abbreviated as IGRT), and other accurate radiation therapy technologies.

Currently, images of a tumor need to be acquired before or during radiation therapy to achieve tumor localization.

BRIEF SUMMARY OF THE PRESENT DISCLOSURE

In a first aspect, an image acquisition control method is provided, including:

a plurality of exposure signals from an exposure controller are sequentially acquired, and each exposure signal is used for indicating the exposure time when the X-ray generating device generates exposure.

Acquiring corresponding rotation angles of a rotating body carrying the X-ray generating device at each exposure time, wherein each rotation angle corresponds to a projection image generated by a detector at the corresponding exposure time; wherein the detector and the X-ray generating device are arranged on the rotating body in a way of being opposite to each other.

In some embodiments, obtaining a rotation angle of the rotating body corresponding to any exposure time includes:

a print mark signal is generated in response to the exposure signal.

And acquiring a rotation angle corresponding to the exposure time of the rotator according to the printing mark signal.

In some embodiments, before sequentially acquiring the plurality of exposure signals from the exposure controller, further comprising:

when the rotating body is monitored to rotate to an exposure starting angle, an exposure permitting signal is output to the exposure controller, and the exposure permitting signal is used for instructing the exposure controller to control the X-ray generating device to start to perform multiple exposure.

In some embodiments, when the rotation of the rotating body is monitored to reach an exposure start angle, outputting an exposure permission signal to the exposure controller, including:

when the rotating body is monitored to rotate to an exposure initial angle, the rotating speed of the rotating body is obtained, and when the rotating body is monitored to rotate at a constant speed at a target rotating speed, an exposure permission signal is output to the exposure controller.

In some embodiments, the control method further comprises:

when the rotation body is monitored to rotate to an exposure end angle, a rotation completion instruction is output to the exposure controller, so that the exposure controller controls the X-ray generation device to stop exposure.

In some embodiments, the control method further comprises:

a prepare exposure request is received from the exposure controller.

Transmitting a motion parameter to a rotating body driving device so that the rotating body driving device drives the rotating body to rotate; wherein the motion parameter includes at least one of an exposure start angle, an exposure end angle, and a target rotation speed.

In some embodiments, the control method further comprises:

and transmitting the rotation angle of the rotator at each exposure time to an image server so that the image server can reconstruct the projection image corresponding to the rotation angle at each exposure time.

In some embodiments, the exposure signal is a pulse signal; the exposure time is a time when the pulse signal is switched from a non-operation level to an operation level.

In a second aspect, an image acquisition control method is provided, including:

a plurality of exposure signals from the high-voltage generator are acquired in sequence, and each exposure signal is used for indicating the exposure time when the X-ray generating device generates exposure.

Sequentially sending the plurality of exposure signals to the motion control device so that the motion control device obtains the rotation angle of a rotating body carrying the X-ray generating device at each exposure time, wherein each rotation angle corresponds to a projection image generated by a detector at the corresponding exposure time; wherein the detector and the X-ray generating device are arranged on the rotating body in a way of being opposite to each other.

In some embodiments, before sequentially acquiring the plurality of exposure signals from the high voltage generator, the method further comprises:

when receiving the permissible exposure signal output by the motion control device, the device sends exposure parameters to the high-voltage generator so as to control the X-ray generation device to sequentially perform multiple exposure through the high-voltage generator.

In some embodiments, the exposure parameters include a preset exposure duration of one exposure; the method further comprises the steps of:

in turn, receives a plurality of exposure parameters from an image server.

When receiving the permissible exposure signals output by the motion control device, sequentially sending the exposure parameters to the high-voltage generator, and controlling the high-voltage generator to sequentially provide high voltage for the X-ray generating device so as to sequentially expose the X-ray generating device.

And for each exposure, when the exposure time reaches the preset exposure time, controlling the high voltage generator to stop providing high voltage for the X-ray generating device so as to stop the X-ray generating device from exposing.

In some embodiments, the control method further comprises:

and receiving a rotation completion instruction from the motion control device, and controlling the X-ray generation device to stop exposure.

In some embodiments, the control method further comprises:

transmitting a ready-to-expose request to the motion control device in response to an initializing operation by a user to cause the rotator driving device to drive the rotator to rotate; wherein the exposure parameters include at least one of an exposure start angle, an exposure end angle, and a target rotation speed.

In a third aspect, an image acquisition system is provided that includes a rotating body rotatably disposed, an X-ray generating device, a detector, a high voltage generator, an exposure controller, and a motion control device.

Wherein the X-ray generating device is arranged on the rotating body and is configured to emit X-rays. A detector is provided on the rotating body opposite to the X-ray generating device and configured to receive X-rays emitted from the X-ray generating device and generate a projection image. A high voltage generator is coupled to the X-ray generation device and configured to provide a high voltage to the X-ray generation device to cause the X-ray generation device to perform a plurality of exposures and generate a plurality of exposure signals. An exposure controller is coupled to the high voltage generator and the detector and is configured to sequentially acquire a plurality of exposure signals from the high voltage generator and sequentially send the plurality of exposure signals to the motion control device, wherein each exposure signal is used for indicating an exposure time when exposure occurs to the X-ray generating device. The motion control device is coupled with the exposure controller and the rotating body and is configured to sequentially acquire a plurality of exposure signals from the exposure controller and acquire corresponding rotation angles of the rotating body at each exposure time, wherein each rotation angle corresponds to a projection image generated by the detector at the corresponding exposure time.

In some embodiments, the image acquisition system further comprises an image server coupled to the detector and the motion control device and configured to acquire a rotation angle of the rotator at each exposure time from the motion control device, acquire a projection image generated by the detector at the corresponding exposure time, and reconstruct an image of the projection image corresponding to the rotation angle at each exposure time.

In some embodiments, the image acquisition system further comprises a communication exchanger coupled to the motion control device and the image server and configured to communicate with the motion control device to obtain a rotation angle corresponding to each exposure from the motion control device; and communicating with the image server, and outputting the acquired rotation angle corresponding to each exposure to the image server.

In some embodiments, the image acquisition system further comprises a rotator drive device coupled to the motion control device and the rotator and configured to drive the rotator in rotation.

In a fourth aspect, there is provided a radiation therapy system comprising a radiation therapy head and the image acquisition system of the third aspect, wherein the radiation therapy head is disposed on the rotating body.

In a fifth aspect, a motion control device is provided, comprising instruction code for performing the control method according to any of the embodiments of the first aspect.

In a sixth aspect, there is provided an exposure controller comprising instruction code for performing the control method according to any one of the embodiments of the second aspect.

Drawings

In order to more clearly illustrate the technical solutions of the present disclosure, the drawings that need to be used in some embodiments of the present disclosure will be briefly described below, and it is apparent that the drawings in the following description are only drawings of some embodiments of the present disclosure, and other drawings may be obtained according to these drawings to those of ordinary skill in the art. Furthermore, the drawings in the following description may be regarded as schematic diagrams, not limiting the actual size of the products, the actual flow of the methods, the actual timing of the signals, etc. according to the embodiments of the present disclosure.

FIG. 1 is a block diagram of an image acquisition system involved in an image acquisition control method according to some embodiments of the present disclosure;

FIG. 2 is a flow chart of an image acquisition control method according to some embodiments of the present disclosure;

FIG. 3 is a flow chart of an image acquisition control method according to further embodiments of the present disclosure;

FIG. 4 is a block diagram of an image acquisition system involved in an image acquisition control method according to further embodiments of the present disclosure;

FIG. 5 is an interactive flow chart of an initialization phase of an image acquisition control method according to some embodiments of the present disclosure;

FIG. 6 is another interactive flow chart of an initialization phase of an image acquisition control method according to some embodiments of the present disclosure;

FIG. 7 is an interactive flow chart of a preparation phase of an image acquisition control method according to some embodiments of the present disclosure;

FIG. 8 is an interactive flow chart of an exposure phase of an image acquisition control method according to some embodiments of the present disclosure;

FIG. 9 is a flow chart of acquiring rotation angles for an image acquisition control method according to some embodiments of the present disclosure;

fig. 10 is a block diagram of a radiation therapy system according to some embodiments of the present disclosure.

Detailed Description

The following description of the embodiments of the present disclosure will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by one of ordinary skill in the art based on the embodiments provided by the present disclosure are within the scope of the present disclosure.

Throughout the specification and claims, unless the context requires otherwise, the word "comprise" and its other forms such as the third person referring to the singular form "comprise" and the present word "comprising" are to be construed as open, inclusive meaning, i.e. as "comprising, but not limited to. In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", "some examples", "and the like are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more.

In describing some embodiments, the expression "coupled" and its derivatives may be used. For example, the term "coupled" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact with each other.

The use of "adapted" or "configured to" herein is meant to be an open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

In the related art, three-dimensional images of a tumor of a patient are reconstructed by acquiring images of the tumor of the patient at different angles, so that the tumor is positioned, and the image guidance of the tumor is facilitated. At present, an image acquisition system adopted for acquiring images comprises an X-ray generating device (such as a bulb tube) and a detector which are rotatably arranged, and how to control the X-ray generating device and the detector to acquire images in the rotation process becomes a technical problem to be solved.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an image acquisition system 100 related to an image acquisition control method according to an embodiment of the application. The image acquisition system 100 may include: an exposure controller 101, a motion control device 102, a rotating body 103 provided rotatably, a high voltage generator 104, an X-ray generating device 105, and a detector 106. Wherein the X-ray generating device 105 and the detector 106 are disposed on the rotating body 103 opposite to each other; the high voltage generator 104 is coupled to the X-ray generation device 105; the exposure controller 101 is coupled with the high voltage generator 104 and the detector 106; the motion control device 102 is coupled to the high voltage generator 104 and the rotating body 103.

Referring to fig. 2, fig. 2 is a flowchart of an image acquisition control method according to an embodiment of the present application. The image acquisition control method is applied to the exposure controller 101 in the image acquisition system 100 shown in fig. 1. The image acquisition control method may include the following S201 to S202:

s201: a plurality of exposure signals from the high voltage generator are acquired in turn, and each exposure signal is used for indicating the exposure time when the X-ray generating device generates exposure.

The "exposure signal" is generated by the high voltage generator and transmitted to the exposure controller when the X-ray generator generates exposure, and can be used to instruct the exposure time when the X-ray generator generates exposure.

S202: and sequentially sending the plurality of exposure signals to the motion control device so that the motion control device obtains the rotation angle of the rotating body carrying the X-ray generating device at each exposure time, wherein each rotation angle corresponds to the projection image generated by the detector at the corresponding exposure time.

It will be appreciated that the patient's body is secured within the rotating body such that X-rays emitted by the X-ray generating device illuminate the patient's lesion and pass through the patient's lesion to be able to illuminate a detector that receives the X-rays and generates a projection image of the lesion.

According to the embodiment of the disclosure, the exposure controller sequentially acquires a plurality of exposure signals from the high-voltage generator and sends the plurality of exposure signals to the motion control device, so that the motion control device acquires the rotation angle corresponding to each exposure time of the rotating body, each rotation angle corresponds to the projection image generated by the detector at the corresponding exposure time, and the accuracy of the correspondence of the rotation angle and the projection image at the exposure time is improved.

Referring to fig. 3, fig. 3 is a flowchart of an image acquisition control method according to an embodiment of the present application. The image acquisition control method is applied to the motion control device 102 in the image acquisition system 100 shown in fig. 1. The image acquisition control method may include the following S301 to S302:

s301: a plurality of exposure signals from an exposure controller are sequentially acquired, and each exposure signal is used for indicating the exposure time when the X-ray generating device generates exposure.

S302: and acquiring a corresponding rotation angle of the rotating body carrying the X-ray generating device at each exposure time, wherein each rotation angle corresponds to a projection image generated by the detector at the corresponding exposure time.

It will be appreciated that the patient's body is fixed within the rotating body such that X-rays emitted by the X-ray generating device illuminate the patient's lesion and pass through the patient's lesion to be able to illuminate a detector that receives the X-rays and generates a projection image of the lesion.

According to the embodiment of the disclosure, the motion control device sequentially acquires a plurality of exposure signals from the exposure controller, and acquires the corresponding rotation angle of the rotating body at each exposure time according to the exposure time when the X-ray generating device indicated by each exposure signal generates exposure, so that each rotation angle corresponds to the projection image generated by the detector at the corresponding exposure time, and the accuracy of the correspondence of the rotation angle and the projection image at the exposure time is improved.

Referring to fig. 4, fig. 4 is a schematic structural diagram of an image acquisition system 100 according to another image acquisition control method according to an embodiment of the present application. The image acquisition system 100 may include: an exposure controller 101, a motion control device 102, a rotating body 103, a high voltage generator 104, an X-ray generating device 105, a detector 106, an image server 107, and a rotating body driving device 108.

Wherein the X-ray generating device 105 and the detector 106 are arranged on the rotating body 103 opposite to each other, and at least part of the X-rays emitted by the X-ray generating device 105 are irradiated on the detector 106; the rotating body driving device 108 is coupled with the rotating body 103 and is used for driving the rotating body 103 to drive the X-ray generating device 105 and the detector 106 to rotate; the high voltage generator 104 is coupled with the X-ray generating device 105, and transmits the energy required by exposure to the X-ray generating device 105; the exposure controller 101 is coupled with the high voltage generator 104 and the detector 106, so that the high voltage generator 104 and the detector 106 work on the same time base; the motion control device 102 is coupled with the rotator driving device 108 and the image server 107, and is used for controlling the rotator 103 to rotate and transmitting rotation angle information to the image server 107; the image server 107 is coupled to the exposure controller 101 and the detector 106, and is configured to send the exposure parameters to the exposure controller and acquire the projection image acquired by the detector 106.

Another image acquisition control method provided by the embodiment of the present application is applied to the image acquisition system 100 shown in fig. 4, and includes the following stages: an initialization stage P1, an exposure preparation stage P2, and an exposure stage P3.

As shown in fig. 5, the initialization stage P1 includes the following steps S20 to S21:

s20: the exposure controller transmits a ready-to-expose request to the motion control device in response to an initialization operation by a user.

Here, the user's initialization operation includes the user triggering the exposure hand brake, and after the user triggers the exposure hand brake, the exposure controller sends a request for ready exposure to the motion control device.

S21: the motion control device receives a preparation exposure request from the exposure controller, and sends motion parameters to the rotating body driving device so that the rotating body driving device drives the rotating body to rotate.

It will be appreciated that the motion control means receives a ready exposure request from the exposure controller and, in response to the ready exposure request, sends a motion parameter to the rotator driving means, which may control the rotation of the rotator in accordance with the motion parameter.

Wherein the "motion parameter" includes at least one of an exposure start angle, an exposure end angle, and a target rotation speed.

The "motion parameter" may be a parameter preset by the motion control device, or may be a parameter that the image server sends to the motion control device in advance.

In some embodiments, as shown in fig. 6, the initialization phase P1 further includes the following S22:

s22: when the motion control device monitors that the rotating body rotates to an exposure starting angle, an exposure permitting signal is output to the exposure controller.

The "exposure permission signal" is used to instruct the exposure controller to control the X-ray generation apparatus to start performing a plurality of exposures.

It is understood that the rotation of the rotating body to the exposure start angle is a precondition that the exposure controller controls the X-ray generating device to start the exposure for a plurality of times.

In addition, in the process that the rotator driving device drives the rotator to rotate, the rotation angle of the rotator is fed back to the motion control device in real time, so that the motion control device can monitor the rotation angle of the rotator.

The rotary body rotates to an exposure start angle, and the rotary body driving device feeds back a first motion feedback signal of the rotary body rotating to the exposure start angle to the motion control device. The motion control means outputs an exposure permission signal to the exposure controller in response to a first motion feedback signal from the rotating body driving means.

In some embodiments, S22: when the motion control device monitors that the rotating body rotates to an exposure initial angle, the motion control device outputs an exposure permission signal to the exposure controller, and the motion control device comprises:

when the motion control device monitors that the rotating body rotates to an exposure initial angle, the rotation speed of the rotating body is obtained, and when the rotating body rotates at a uniform speed at a target rotation speed, an exposure permission signal is output to the exposure controller.

It will be appreciated that the rotator starts rotating and accelerating under the drive of the rotator driving device until the rotation speed is increased to the target rotation speed, and rotates at a constant speed according to the target rotation speed.

When the motion control device monitors that the rotating body rotates to an exposure initial angle, the rotating body driving device feeds back a second motion feedback signal carrying the current moment rotation speed to the motion control device in real time. And the motion control device judges whether the rotating body reaches a motion state of rotating at a uniform speed at the target rotation speed according to the rotation speed at the current moment carried by the second motion feedback signal. When the rotating body reaches a motion state in which the rotating body rotates at a constant speed at a target rotation speed, the motion control device outputs an exposure permission signal to the exposure controller.

If the motion control device determines that the rotating body does not reach the motion state in which the rotating body rotates at the target rotation speed at the uniform speed, the rotating body should be in the motion state of accelerating rotation, and the motion control device does not output the exposure permission signal to the exposure controller. And the motion control device continues to judge according to the second motion feedback signal until the rotating body is judged to reach a motion state of rotating at a uniform speed at the target rotating speed, and then the motion control device outputs an exposure permission signal to the exposure controller.

According to the embodiment of the disclosure, the motion control device detects whether the rotating body reaches the motion state of rotating at the target rotating speed at a constant speed, and when the rotating body is detected to reach the motion state of rotating at the target rotating speed at the constant speed, an exposure permission signal is output to the exposure controller to instruct the exposure controller to control the X-ray generation device to start to perform multiple exposure, so that the X-ray generation device can be prevented from performing multiple exposure under the condition that the rotating body is in a non-constant speed state (acceleration state), and the problem of distortion of a projection image generated by the detector is avoided.

As shown in fig. 7, the exposure preparation stage P2 after the initialization stage P1 includes the following S30 to S31:

S30: the exposure controller controls the high voltage generator and the detector to perform exposure preparation in response to an exposure permission signal from the motion control device.

S31: the exposure controller receives ready signals from the high-voltage generator and the detector and controls the image server to send a prompt for completion of preparation to a user.

It will be appreciated that the exposure controller controls the high voltage generator and detector to perform exposure preparation in response to the exposure enable signal from the motion control device. In the case where the high voltage generator and the detector are ready for exposure, the exposure controller controls the image server to issue a prompt for completion of the preparation to the user to prompt the operator that an operation indicating exposure can be made.

The image server illustratively includes a display screen coupled thereto, and the image server displays a ready-to-complete prompt interface on the display screen under the control of the exposure controller so that an operator can get ready-to-complete prompts after viewing.

As shown in fig. 8, the exposure stage P3 following the exposure preparation stage P2 includes the following S08 to S12:

s08: the exposure controller sequentially receives a plurality of exposure parameters from the image server.

It should be noted that, the exposure parameters are generated by the image server and sent to the exposure controller, and the exposure controller can analyze the exposure parameters.

S09: when the exposure controller receives the exposure permission signal output by the motion control device, the exposure controller sequentially sends exposure parameters to the high-voltage generator so as to control the X-ray generation device to sequentially perform multiple exposure through the high-voltage generator.

The "exposure parameter" carries an exposure voltage parameter, and the high voltage generator can generate an exposure voltage (high voltage) according to the exposure voltage parameter and provide the exposure voltage to the X-ray generating device so as to control the X-ray generating device to sequentially perform multiple exposures.

In some embodiments, the "exposure parameter" further includes a preset exposure time period for one exposure, and for each exposure, when the exposure time period reaches the preset exposure time period, the exposure controller controls the high voltage generator to stop providing the exposure voltage to the X-ray generating device, so that the X-ray generating device stops the exposure.

It can be understood that the "preset exposure time period" is a safe exposure time period, and if the exposure time period is longer than or equal to the preset exposure time period, the exposure of the X-ray generating device is overtime, and the X-ray generated by the X-ray generating device may cause damage to the patient; if the exposure time is less than the preset exposure time, the method is safe for the patient.

According to the embodiment of the disclosure, the exposure time length is compared with the preset exposure time length through the exposure controller, if the exposure time length is greater than or equal to the preset exposure time length, the exposure controller controls the high-voltage generator to stop providing the exposure voltage for the X-ray generating device, so that the X-ray generating device stops the exposure, the irradiation time length of the X-rays on a patient can be prevented from exceeding the preset exposure time length, and damage to normal tissues of the patient is reduced.

S10: the exposure controller sequentially acquires a plurality of exposure signals from the high-voltage generator, and each exposure signal is used for indicating the exposure time when the X-ray generation device generates exposure.

S11: the exposure controller sequentially transmits a plurality of exposure signals to the motion control device.

S12: the motion control device obtains the corresponding rotation angle of the rotating body carrying the X-ray generating device at each exposure time, and each rotation angle corresponds to the projection image generated by the detector at the corresponding exposure time.

In some embodiments, as shown in fig. 9, in S12, the motion control device 102 obtains a rotation angle corresponding to any exposure time of the rotating body 103, and the method may include the following S121 to S122:

s121: the motion control device generates a print mark signal in response to the exposure signal.

S122: the motion control device obtains the corresponding rotation angle of the rotator at the exposure time according to the printing mark signal.

It is understood that the motion control device obtains the exposure signal from the exposure controller, and generates the printing mark signal in response to the exposure signal, and the motion control device can accurately obtain the corresponding rotation angle of the rotator at the exposure time according to the generated printing mark signal.

In some embodiments, the exposure signal is a pulse signal, and the exposure time is a time when the pulse signal is switched from the non-operating level to the operating level.

Illustratively, the active level of the pulse signal is low and the inactive level is high, in which case the exposure time is the time at which the pulse signal switches from high to low.

Illustratively, the active level of the pulse signal is high and the inactive level is low, in which case the exposure time is the time at which the pulse signal switches from low to high.

In some embodiments, as shown in fig. 8, after S12, the exposure phase P3 further includes S13 as follows:

s13: the motion control device transmits the rotation angle of the rotator at each exposure time to the image server so that the image server can reconstruct the projection image corresponding to the rotation angle at each exposure time. The image server can reconstruct images according to projection images corresponding to a plurality of different rotation angles, and can obtain a three-dimensional image of a focus of a patient, thereby realizing the positioning of the focus.

In some embodiments, as shown in fig. 8, after S13, the exposure phase P3 further includes the following S14 to S15:

s14: when the motion control device detects that the rotator rotates to an exposure ending angle, a rotation completion instruction is output to the exposure controller.

S15: the exposure controller receives the rotation completion instruction from the motion control device and controls the X-ray generation device to stop exposure.

It will be appreciated that the rotation body is rotated to an exposure termination angle and the rotation body driving means feeds back a third motion feedback signal to the motion control means, which characterizes that the X-ray generating means can stop the exposure.

The motion control device outputs a rotation completion instruction to the exposure controller in response to the third motion feedback signal from the rotation body driving device, so that the exposure controller controls the X-ray generation device to stop exposure after the end of the currently performed exposure.

In addition, the motion control means outputs a motion control signal to the rotation body driving means in response to the third motion feedback signal from the rotation body driving means to cause the rotation body driving means to control the rotation body to start decelerating until the rotation body stops rotating.

It should be noted that, the rotation body driving device controls the rotation body to start decelerating in response to the motion control signal, and the deceleration should be started after the last exposure performed by the X-ray generating device is finished, so as to ensure that the last exposure is performed in a state that the rotation body rotates at a constant speed, thereby avoiding the problem of distortion of the projection image generated by the detector.

Referring to fig. 1, an image acquisition system 100 according to an embodiment of the present application includes an exposure controller 101, a motion control device 102, a rotating body 103, a high voltage generator 104, an X-ray generating device 105, and a detector 106.

Wherein the X-ray generating device 105 is provided on the rotating body 103 provided rotatably, and configured to emit X-rays.

The detector 106 is provided on the rotating body 103 provided rotatably, opposite to the X-ray generating device 105, and is configured to receive the X-rays emitted from the X-ray generating device 105 and generate a projection image.

It will be appreciated that the X-rays emitted by the X-ray generating device 105 illuminate a lesion of the patient and pass through the lesion of the patient to impinge on the detector 106, which detector 106 receives the X-rays and generates a projection image of the lesion.

Illustratively, the detector 106 may be a KV (kilovolt) flat panel detector.

The high voltage generator 104 is coupled to the X-ray generating device 105 and is configured to supply a high voltage to the X-ray generating device 105 to cause the X-ray generating device 105 to perform a plurality of exposures and generate a plurality of exposure signals.

The X-ray generating device 105 is illustratively connected to the high voltage generator 104 by an anode cable and a high voltage cable. Wherein the X-ray generating device 105 comprises a rotating electrical machine, which is supplied with electrical energy by an anode cable; the exposure voltage is supplied to the X-ray generating device 105 via a high voltage cable to supply electric power to the X-ray generating device 105 for emitting X-rays.

The exposure controller 101 is coupled to the high voltage generator 104 and the detector 106, and is configured to sequentially acquire a plurality of exposure signals from the high voltage generator 104 and sequentially transmit the plurality of exposure signals to the motion control device 102. Wherein each exposure signal is used to indicate the exposure time when the X-ray generation device 105 is exposed.

The motion control device 102 is coupled to the exposure controller 101 and the rotating body 103, and is configured to sequentially acquire a plurality of exposure signals from the exposure controller 101, and acquire a rotation angle of the rotating body 103 corresponding to each exposure time, each rotation angle corresponding to a projection image generated by the detector 106 at the corresponding exposure time.

It will be appreciated that, since the X-ray generating device 105 and the detector 106 are rotated by the rotation body 103, the rotation angle of the rotation body 103 corresponds to the projection image generated by the detector 106 at the corresponding exposure time.

Illustratively, the motion control device 102 may be a programmable logic controller (Programmable Logic Controller, simply PLC).

In the above embodiment of the disclosure, the motion control device 102 sequentially acquires a plurality of exposure signals from the exposure controller 101, and acquires the rotation angle corresponding to each exposure time of the rotating body 103 according to the exposure time when the X-ray generating device 105 generates the exposure indicated by each exposure signal, so that each rotation angle corresponds to the projection image generated by the detector 106 at the corresponding exposure time, and the accuracy of the correspondence between the rotation angle and the projection image at the exposure time is improved.

In some embodiments, as shown in fig. 4, the image acquisition system 100 further includes a rotator drive device 108, the rotator drive device 108 being coupled to the motion control device 102 and the rotator 103. The rotation body driving device 108 is configured to drive the rotation body 103 to rotate.

In some embodiments, the rotating body 103 is an annular gantry or a C-arm for rotating the X-ray generating device 105 and the detector 106.

In some embodiments, as shown in fig. 4, the image acquisition system 100 further includes an image server 107, and the image server 107 is coupled to the detector 106 and the motion control device 102. The image server 107 is configured to acquire a rotation angle of the rotating body 103 at each exposure time from the motion control device 102, and acquire a projection image generated by the detector 106 at the corresponding exposure time, and reconstruct an image of the projection image corresponding to the rotation angle at each exposure time.

It should be noted that, the image server 107 performs image reconstruction according to the projection images corresponding to the plurality of different rotation angles, so as to obtain a three-dimensional image of the lesion of the patient, thereby realizing the positioning of the lesion.

For example, the detector 106 may be coupled to the image server 107 via a network cable to enable transmission of the projected image.

In some embodiments, as shown in fig. 4, the image server 107 is further coupled to the exposure controller 101, and the image server 107 is further configured to communicate with the exposure controller 101 to output exposure parameters to the exposure controller 101.

The exposure controller 101 is further configured to receive the exposure parameters from the image server 107, and output the exposure parameters to the high voltage generator 104, so as to control the X-ray generation device 105 to sequentially perform multiple exposures by the high voltage generator 104.

The "exposure parameter" carries an exposure voltage parameter, and the high voltage generator 104 may generate an exposure voltage according to the exposure voltage parameter, and provide the exposure voltage to the X-ray generating device 105, so as to provide electric energy for the X-ray generating device 105 to emit X-rays.

In addition, the "exposure parameters" may also carry other exposure parameters, such as the number of exposures, the duration of each exposure, or the frequency of the exposure, etc.

For example, the image server 107 may be coupled to the exposure controller 101 through an RS-232 standard interface to enable communication between the image server 107 and the exposure controller 101.

In some embodiments, as shown in fig. 1, a high voltage generator 104 is coupled to the exposure controller 101, the high voltage generator 104 being configured to control the X-ray generation device 105 to sequentially perform a plurality of exposures in response to exposure parameters from the exposure controller 101; and, after each exposure, outputs an exposure signal to the exposure controller 101.

Illustratively, the high voltage generator 104 may be coupled to the exposure controller 101 through an RS-232 standard interface.

In some embodiments, as shown in fig. 4, the image acquisition system 100 further includes a communication switch 109, and the communication switch 109 is coupled to the motion control device 102 and the image server 107. The communication exchanger 109 is configured to communicate with the motion control device 102, receive a motion angle corresponding to each exposure from the motion control device 102, and communicate with the image server 107, and output the acquired rotation angle corresponding to each exposure to the image server 107.

It will be appreciated that the motion control device 102 may autonomously communicate with the communication switch 109 and send the rotation angle corresponding to each exposure to the communication switch 109. Then, the communication exchanger 109 communicates with the image server 107, and outputs the acquired rotation angle corresponding to each exposure to the image server 107.

The image server 107 may communicate with the communication exchanger 109, and the communication exchanger 109 may transmit an acquisition request to the motion control device 102, and the motion control device 102 may transmit the rotation angle corresponding to each exposure to the image server 107 through the communication exchanger 109 in response to the acquisition request.

Referring to fig. 10, fig. 10 is a block diagram of a radiation therapy system according to an embodiment of the present application. The radiation therapy system 200 can include: a radiation therapy head 201 and the image acquisition system 100 of any of the embodiments described above, wherein the radiation therapy head 201 is disposed on the rotating body 103.

The above-described embodiments of the present disclosure, through the image acquisition system 100 included in the radiation therapy system 200, can improve the accuracy of the correspondence between the rotation angle and the projection image at the exposure time, improve the positioning accuracy of the focus of the patient, and facilitate the accurate radiation therapy of the focus by the radiation therapy head 201.

The embodiment of the present application further provides an exposure controller, which may be the exposure controller 101 in the image acquisition system 100 shown in fig. 1. The exposure controller 101 is configured to execute the image acquisition control method shown in fig. 3 to 8.

The embodiment of the present application further provides a motion control device, which may be the motion control device 102 in the image capturing system 100 shown in fig. 1. The motion control device 102 is configured to perform the image acquisition control method shown in fig. 3 to 9.

The foregoing is merely specific embodiments of the disclosure, but the protection scope of the disclosure is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the disclosure, and it is intended to cover the scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

An image acquisition control method, comprising:

sequentially acquiring a plurality of exposure signals from an exposure controller, wherein each exposure signal is used for indicating the exposure time when the X-ray generating device generates exposure;

acquiring corresponding rotation angles of a rotating body carrying the X-ray generating device at each exposure time, wherein each rotation angle corresponds to a projection image generated by a detector at the corresponding exposure time; wherein the detector and the X-ray generating device are arranged on the rotating body in a way of being opposite to each other.
The control method according to claim 1, obtaining a rotation angle of the rotating body corresponding to any exposure time, comprising:

generating a print mark signal in response to the exposure signal;

and acquiring a rotation angle corresponding to the exposure time of the rotator according to the printing mark signal.
The control method according to claim 1, further comprising, before sequentially acquiring the plurality of exposure signals from the exposure controller:

when the rotating body is monitored to rotate to an exposure starting angle, an exposure permitting signal is output to the exposure controller, and the exposure permitting signal is used for instructing the exposure controller to control the X-ray generating device to start to perform multiple exposure.
The control method according to claim 3, wherein the outputting of the exposure permission signal to the exposure controller when the rotation of the rotating body to the exposure start angle is monitored includes:

when the rotating body is monitored to rotate to an exposure initial angle, the rotating speed of the rotating body is obtained, and when the rotating body is monitored to rotate at a constant speed at a target rotating speed, an exposure permission signal is output to the exposure controller.
The control method according to claim 1, further comprising:

when the rotation body is monitored to rotate to an exposure end angle, a rotation completion instruction is output to the exposure controller, so that the exposure controller controls the X-ray generation device to stop exposure.
The control method according to claim 1, further comprising:

receiving a prepare exposure request from the exposure controller;

transmitting a motion parameter to a rotating body driving device so that the rotating body driving device drives the rotating body to rotate; wherein the motion parameter includes at least one of an exposure start angle, an exposure end angle, and a target rotation speed.
The control method according to claim 1, further comprising:

And transmitting the rotation angle of the rotator at each exposure time to an image server so that the image server can reconstruct the projection image corresponding to the rotation angle at each exposure time.
The control method according to claim 1, wherein the exposure signal is a pulse signal; the exposure time is a time when the pulse signal is switched from a non-operation level to an operation level.
An image acquisition control method, comprising:

sequentially acquiring a plurality of exposure signals from a high-voltage generator, wherein each exposure signal is used for indicating the exposure time when the X-ray generating device generates exposure;

sequentially sending the plurality of exposure signals to the motion control device so that the motion control device obtains the rotation angle of a rotating body carrying the X-ray generating device at each exposure time, wherein each rotation angle corresponds to a projection image generated by a detector at the corresponding exposure time; wherein the detector and the X-ray generating device are arranged on the rotating body in a way of being opposite to each other.
The control method according to claim 9, further comprising, before sequentially acquiring the plurality of exposure signals from the high voltage generator:

When receiving the permissible exposure signal output by the motion control device, the device sends exposure parameters to the high-voltage generator so as to control the X-ray generation device to sequentially perform multiple exposure through the high-voltage generator.
The control method according to claim 10, wherein the exposure parameter includes a preset exposure time period for one exposure; the method further comprises the steps of:

sequentially receiving a plurality of exposure parameters from an image server;

when receiving the permissible exposure signals output by the motion control device, sequentially sending the exposure parameters to the high-voltage generator, and controlling the high-voltage generator to sequentially provide high voltage for the X-ray generation device so as to sequentially expose the X-ray generation device;

and for each exposure, when the exposure time reaches the preset exposure time, controlling the high voltage generator to stop providing high voltage for the X-ray generating device so as to stop the X-ray generating device from exposing.
The control method according to claim 9, further comprising:

and receiving a rotation completion instruction from the motion control device, and controlling the X-ray generation device to stop exposure.
The control method according to claim 9, further comprising:

Transmitting a ready-to-expose request to the motion control device in response to an initializing operation by a user to cause the rotator driving device to drive the rotator to rotate; wherein the exposure parameters include at least one of an exposure start angle, an exposure end angle, and a target rotation speed.
An image acquisition system, comprising:

a rotating body rotatably provided;

an X-ray generating device provided on the rotating body, configured to emit X-rays;

a detector provided on the rotating body, opposite to the X-ray generating device, configured to receive the X-rays emitted from the X-ray generating device and generate a projection image;

a high voltage generator coupled to the X-ray generating device and configured to provide a high voltage to the X-ray generating device to cause the X-ray generating device to perform a plurality of exposures and generate a plurality of exposure signals;

an exposure controller coupled to the high voltage generator and the detector and configured to sequentially acquire a plurality of exposure signals from the high voltage generator and sequentially transmit the plurality of exposure signals to the motion control device, wherein each exposure signal is used for indicating an exposure time when exposure occurs to the X-ray generating device;

And the motion control device is coupled with the exposure controller and the rotating body and is configured to sequentially acquire a plurality of exposure signals from the exposure controller and acquire corresponding rotation angles of the rotating body at each exposure time, wherein each rotation angle corresponds to a projection image generated by the detector at the corresponding exposure time.
The image acquisition system according to claim 14, further comprising:

and the image server is coupled with the detector and the motion control device and is configured to acquire the rotation angle of the rotating body at each exposure time from the motion control device, acquire the projection image generated by the detector at the corresponding exposure time and reconstruct the projection image corresponding to the rotation angle at each exposure time.
The image acquisition system according to claim 15, further comprising:

a communication exchanger coupled to the motion control device and the image server and configured to communicate with the motion control device to obtain a rotation angle corresponding to each exposure from the motion control device; and communicating with the image server, and outputting the acquired rotation angle corresponding to each exposure to the image server.
The image acquisition system according to claim 14, further comprising:

and a rotator driving device coupled to the motion control device and the rotator and configured to drive the rotator to rotate.
A radiation therapy system comprising a radiation therapy head and an image acquisition system as claimed in any one of claims 14 to 17, wherein the radiation therapy head is provided on the rotating body.
A motion control apparatus comprising instruction code for performing the control method of any one of claims 1 to 8.
An exposure controller comprising instruction code for executing the control method according to any one of claims 9 to 13.