CN115825125A - Multichannel synchronous acquisition system and method for array micro CT imaging - Google Patents
Multichannel synchronous acquisition system and method for array micro CT imaging Download PDFInfo
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Abstract
The invention belongs to the technical field of micro CT imaging, and particularly relates to a multi-channel synchronous acquisition system and a multi-channel synchronous acquisition method for array micro CT imaging, which are convenient for synchronously controlling all parts of the array micro CT so as to ensure accurate imaging. The multichannel synchronous acquisition system of array micro CT imaging includes: the X-ray source, support, imaging unit and synchronous control unit. The X-ray source is configured to provide X-rays; the bracket is configured to fix an object to be imaged; a plurality of imaging unit arrays are arranged. The synchronous control unit is at least electrically connected with the plurality of imaging units, the synchronous control unit is configured to receive a system work command containing a synchronous control instruction from an upper layer system and receive sequence information of a time frame where the plurality of imaging units are located, and the synchronous control unit is further configured to generate the synchronous control instruction according to the received system work command and the sequence information of the time frame and issue the synchronous control instruction to the plurality of imaging units.
Description
Technical Field
The invention belongs to the technical field of micro CT imaging, and particularly relates to a multi-channel synchronous acquisition system and method for array micro CT imaging.
Background
The micro CT imaging usually pursues the best spatial resolution, but with the development of industrial technology, the volume range of the sample to be detected under high resolution is also expanding. When the volume of the sample to be detected exceeds the imaging visual field with a single visual angle, the imaging visual field is amplified by splicing array imaging units based on an optical coupling detector. For the array micro CT imaging unit, a plurality of imaging units can obtain a larger imaging visual field on the original basis by the distribution of the reasonable spatial position relationship of the imaging units so as to adapt to the detection requirement of a sample to be detected. The array imaging unit arrangement is adopted, the problem of small imaging visual field is effectively solved to a certain extent, but compared with a method for increasing the imaging visual field through a single visual angle, a new requirement is provided for the synchronism of the working time sequence of the array multi-imaging unit.
For the imaging process of the array multi-imaging unit, the related scholars conduct research on the synchronous control technology. At present, there are many methods for the synchronization control process, and the methods for implementing high-precision synchronization control are mainly divided into an interrupt synchronization control method and a delay synchronization control method. The interrupt control method is used for carrying out interrupt control on interrupt pins of all working devices in the system, and because the work of the system is carried out according to the period of a clock, different working devices are interrupted through time frames in the same period so as to keep the working states of different working devices in the same period. In practice, the method is generally applied to different types of working devices in the same system, such as a multi-axis mechanical arm, a multi-element signal acquisition system and the like. The delay synchronization control method forces each working device to be kept in an interrupt state through a signal of cycle ending, and then a clock sends a signal uniformly to start the synchronization of the next cycle of each working device, so that the cycles of each device are forced to be synchronous, and further the working action and the working state are kept synchronous.
Due to the underlying control principle of the interrupt synchronization control method, in an array type micro-CT imaging system, a plurality of imaging units of the same type and different viewing angles are difficult to control. In practical application, due to the fact that a delay synchronous control method is adopted, the clock of a working device needs to be calibrated frequently, the stability of the system is affected frequently, in the micro CT imaging process, except for a static imaging process, dynamic continuous imaging cannot be controlled effectively through the delay control method, and system collapse is prone to occurring.
Disclosure of Invention
In order to overcome the defects in the related art, the invention provides a multi-channel synchronous acquisition system and a multi-channel synchronous acquisition method for array micro-CT imaging, which are convenient for synchronously controlling all parts of the array micro-CT so as to ensure accurate imaging.
In order to achieve the above objects, in one aspect, the present invention provides a multi-channel synchronous acquisition system for array micro-CT imaging. The multichannel synchronous acquisition system for the array micro CT imaging comprises: the X-ray source, support, imaging unit and synchronous control unit. Wherein the X-ray source is configured to provide X-rays; the bracket is configured to fix an object to be imaged; the imaging units are arranged in an array mode, and the X-ray source, the support and the imaging units are sequentially arranged on a straight line.
The synchronous control unit is at least electrically connected with the plurality of imaging units, the synchronous control unit is configured to receive a system work command containing a synchronous control instruction from an upper layer system and receive sequence information of a time frame where the plurality of imaging units are located, and the synchronous control unit is further configured to generate a synchronous control instruction according to the received system work command and the sequence information of the time frame and issue the synchronous control instruction to the plurality of imaging units.
Preferably, the synchronization control unit includes at least a microprocessor configured to receive the system operation command containing the synchronization control instruction and the sequence information of the time frame, and the microprocessor is further configured to perform data processing on the received system operation command and the sequence information, generate the synchronization control instruction, and transmit the synchronization control instruction to the plurality of imaging units.
On the other hand, the invention also provides a multi-channel synchronous acquisition method for array micro-CT imaging, which is applied to the multi-channel synchronous acquisition system for array micro-CT imaging in any embodiment.
The multichannel synchronous acquisition method for the array micro CT imaging comprises the following steps: and receiving a system work order transmitted from an upper system, and analyzing the system work order. And classifying the system work command containing the synchronous control command into a synchronous control command group. And analyzing the action commands which need to be executed in the corresponding imaging units by the system working commands in the synchronous control command group.
According to the action instruction needing to be executed, the corresponding imaging unit carries out system clock calibration, wherein the system clock calibration comprises the following steps: the imaging unit uploads sequence information of a time frame where the current state is located to the synchronous control circuit, and the synchronous control circuit selects the time frame corresponding to the minimum sequence as a starting time frame.
And the synchronous control circuit generates a synchronous control instruction according to the starting time frame and the action instruction to be executed, and synchronously sends the synchronous control instruction to the imaging unit corresponding to the system working command.
The synchronous control instruction comprises a work instruction which needs to be executed from a starting time frame to a last time frame in the system work order.
Preferably, the multichannel synchronous acquisition method for array micro-CT imaging further comprises system working timing calibration.
The calibration of the system working time sequence comprises that when the imaging unit images a static object to be imaged in a single mode, the imaging unit carries out calibration of a system clock in a current imaging period once imaging is completed.
Or, the calibration of the system working time sequence comprises that when the imaging unit continuously images the moving object to be imaged, the imaging unit performs calibration of the system clock in the current imaging period once within the time of completing the imaging period once.
Preferably, the multichannel synchronous acquisition method for array micro CT imaging further includes unifying a system operating time sequence, where the unified system operating time sequence includes: and after the system working command transmitted from the upper-layer system is received and analyzed, the system for multi-channel synchronous acquisition of the array micro-CT imaging starts to operate all working components in the same imaging period.
Receiving from upper system
Preferably, the analyzing the system work order comprises: and identifying the data frame tail of each piece of data, and judging whether the data frame tail has the condition of data loss. And identifying the interframe of each piece of data, and judging that the received data is complete if new data is not received and at least one complete data frame tail is identified in a set first time period when the data is received. And identifying the interframe of each piece of data, and judging that the received data is complete if new data is received within a set first time period when the data is received.
The invention has the beneficial effects that:
firstly, according to action instructions to be executed, the corresponding imaging units perform system clock calibration, and each imaging unit can realize synchronous operation in a period corresponding to the current state according to the current state of the imaging unit, so that imaging is continuous and stable.
And secondly, classifying the system working commands containing the synchronous control commands into a synchronous control command group, and carrying out another data processing mode on the system working commands in the synchronous control command group, so that the system working commands are distinguished from other commands, the calculation force can be saved, and the operation efficiency can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or technical solutions in related arts, the drawings used in the description of the embodiments or related arts will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of some related art of the present invention;
FIG. 2 is a block diagram of some embodiments of the present invention;
FIG. 3 is a diagram of one step of the multi-channel synchronous acquisition method of array micro CT imaging according to the present invention;
FIG. 4 is a diagram of another step of the multi-channel synchronous acquisition method for array micro CT imaging according to the present invention;
fig. 5 is a diagram of another step of the multi-channel synchronous acquisition method for array micro-CT imaging according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used 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 defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the term "coupled" may refer to a direct connection, an indirect connection through intervening media, or a connection between two elements; the specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In some embodiments, as shown in fig. 1, a multi-channel simultaneous acquisition system for array micro-CT imaging, comprising: an X-ray source 1, a support 2 and an imaging unit 3. Wherein, X ray source 1, support 2 and imaging unit 3 arrange in proper order on a straight line, and X ray source 1 is configured to provide the X ray, and support 2 is configured to the fixed thing of waiting to image, and a plurality of imaging unit 3 are arranged in array, and a plurality of imaging unit 3 are configured to receive the X ray and form the image.
In order to image a larger object, a plurality of imaging units 3 are arranged in an array, each imaging unit 3 only images a part of the larger object, and the images formed by each imaging unit 3 are spliced to form an overall image of the larger object.
Imaging an object (hereinafter referred to as an object to be imaged) includes an object to be imaged which is stationary and an object to be imaged which has a running property. For the object to be imaged which is to be placed still, the action of each imaging unit is slightly asynchronous, so that the whole image is not distorted, but for the object to be imaged which has the running attribute, the situation that the image is distorted and the picture of the image is completely distorted can be caused due to the slightly asynchronous action of each imaging unit.
The object to be imaged with the operation attribute refers to a moving object.
Based on this, in one aspect, the invention provides, in some embodiments, a multi-channel simultaneous acquisition system for array micro-CT imaging. As shown in fig. 2, the multi-channel synchronous acquisition system for array micro-CT imaging further includes a synchronous control unit 4 in addition to the X-ray source 1, the support 2 and the imaging unit 3. The present invention has been explained in the above embodiments for the X-ray source 1, the support 2 and the imaging unit 3, and will not be described in detail herein.
In some embodiments of the present invention, the synchronization control unit 4 is electrically connected to at least a plurality of the imaging units 3, the synchronization control unit 4 is configured to receive a system operation command containing a synchronization control instruction from the upper system 5, and receive sequence information of a time frame in which the plurality of the imaging units 3 are located, and the synchronization control unit 4 is further configured to generate a synchronization control instruction according to the received system operation command and the sequence information of the time frame, and issue the synchronization control instruction to the plurality of the imaging units 3.
In some embodiments, the synchronization control unit 4 may also be electrically connected to the X-ray source 1 and the gantry 2, so as to issue synchronization control instructions to the X-ray source 1 and the gantry 2.
In some embodiments, the synchronization control unit comprises at least a microprocessor configured to receive the system operation command containing the synchronization control instruction and the sequence information of the time frame, and the microprocessor is further configured to perform data processing on the received system operation command and the sequence information, generate the synchronization control instruction and send the synchronization control instruction to the plurality of imaging units.
In another aspect, some embodiments of the present invention further provide a multi-channel synchronous acquisition method for array micro-CT imaging. The multichannel synchronous acquisition method for the array micro CT imaging is applied to a multichannel synchronous acquisition system for the array micro CT imaging.
As shown in fig. 3, the multichannel synchronous acquisition method for array micro-CT imaging includes:
s1, receiving a system work order transmitted from an upper layer system, and analyzing the system work order.
And S2, classifying the system working command containing the synchronous control command into a synchronous control command group. And analyzing the action commands which need to be executed in the corresponding imaging units by the system working commands in the synchronous control command group.
S3, according to the action instruction needing to be executed, the corresponding imaging unit carries out system clock calibration; wherein the system clock calibration comprises: the imaging unit uploads sequence information of a time frame in which the current state is located to the synchronous control circuit, and the synchronous control circuit selects the time frame corresponding to the minimum sequence as a starting time frame.
And S4, the synchronous control circuit generates a synchronous control instruction according to the starting time frame and the action instruction to be executed, and synchronously sends the synchronous control instruction to the imaging unit corresponding to the system working command.
The synchronous control instruction comprises a work instruction which needs to be executed from a starting time frame to a last time frame in the system work order.
It should be noted that, the imaging unit completes imaging of one frame of image in one working cycle, and in the imaging process of the imaging unit, each component of the multi-channel synchronous acquisition system for array micro-CT imaging is basically in the same working cycle, and in the same working cycle, the working states of different components at the same time are slightly different, for example, one imaging unit may be in the X-th time frame in one working cycle, and another imaging unit may be in the X + N-th time frame in the same working cycle.
In some examples, the technician enters the instructions into an upper system, which may be, for example, a computer that receives the instructions, converts the instructions into electrical signals, and transmits the electrical signals to a multi-channel synchronous acquisition system for arrayed micro-CT imaging. A technician judges whether the instruction needs to be added with a synchronous control instruction according to whether the action generated by the multichannel synchronous acquisition system for array micro CT imaging needs to be coordinated by each component or not. For example, the technician only needs to turn on or off the X-ray source, and other components do not need to cooperate, so the technician may not add the synchronous control command when inputting the command. Or, when the technician needs to shoot the object to be imaged, the multiple imaging units necessarily need to work in cooperation, and therefore, the technician should add a synchronous control instruction when inputting the instruction.
In some examples, the multi-channel synchronous acquisition system for array micro-CT imaging receives system work orders from an upper system, and collects the system work orders including synchronous control orders into a synchronous control order group by analyzing whether the system work orders include the synchronous control orders. The instructions belonging to the synchronous control instruction group can adopt one operation logic to process data, and other instructions can adopt the original operation logic to process data, so that the calculation is saved, and the operation efficiency of the multichannel synchronous acquisition system for array micro CT imaging is improved.
For the system work orders in the synchronous control instruction group, further analysis and processing can be performed, and the actions to be executed by the corresponding components of the system work orders are obtained, for example, a plurality of imaging units are controlled to image an object to be imaged. Before a system working command sends signals to a plurality of corresponding components, the multichannel synchronous acquisition system for array micro CT imaging needs to calibrate the system clock of each component. The system clock calibration is to acquire sequence information of time frames in which corresponding components are located in the same working cycle, and control the components to operate from the start time frame according to the acquired minimum time frame in the components as the start time frame.
For example, a plurality of time frames may be included in one working cycle, and one component completes a corresponding action in each time frame, taking that the multichannel synchronous acquisition system for array micro-CT imaging includes four imaging units as an example, the multichannel synchronous acquisition system for array micro-CT imaging receives a system working command of imaging one object to be imaged by four imaging units. And calibrating the system clock of the four imaging units, wherein if the four imaging units are initialized, the four imaging units can be all positioned at the starting position of the first frame after the clock calibration, and then synchronously receiving a system working command and starting operation.
If the four imaging units are executing other operations, after performing clock calibration, it can be known that the four imaging units are respectively in different time frames in the same working cycle, for example, the first imaging unit is in the nth time frame, the second imaging unit is in the nth + x time frame, the third imaging unit is in the nth + m time frame, and the fourth imaging unit is in the nth + h time frame, then the nth time frame in the working cycle is taken as an initial frame, that is, the four imaging units all operate from the nth time frame, and for the case that imaging exists in the repeated time frames of the second imaging unit, the third imaging unit, and the fourth imaging unit, one of the imaging units can be selected for repeated imaging, so that it can be ensured that the imaging units operate synchronously, and the image to be formed by the object to be imaged cannot be distorted due to asynchronous pictures.
In some embodiments, as shown in fig. 4, the multichannel synchronous acquisition method for array micro CT imaging further includes step S5, and step S5 is a system operation timing calibration.
The calibration of the working time sequence of the system comprises that when the imaging unit images a static object to be imaged by a single piece, the imaging unit performs the calibration of the system clock in the current imaging period once every time imaging is completed.
In other embodiments, the system operation timing calibration includes that when the imaging unit continuously images a moving object to be imaged, the imaging unit performs system clock calibration in a current imaging period once in every time when an imaging period is completed.
Illustratively, the multichannel synchronous acquisition system for array micro-CT imaging is started to operate after receiving a system working command, and if a technician does not issue other action commands, the multichannel synchronous acquisition system for array micro-CT imaging may keep operating for a long time according to the received system working command. During the period, the components of the multichannel synchronous acquisition system for array micro-CT imaging may have asynchronous actions, and the asynchronous actions may be more serious after long-time accumulation, so that the system working time sequence calibration is performed once after one-time imaging is completed or each component is periodically performed.
The system working time sequence calibration is to acquire time frame sequence information of each component in the current working period, and start to operate by taking the sequence information of the minimum time frame as the starting time frame of each component in the working period.
In some embodiments, as shown in fig. 5, the multichannel synchronous acquisition method for array micro-CT imaging further includes step S6, where step S6 is a unified system working timing sequence; the unified system operational sequence includes: and after the system working command transmitted from the upper-layer system is received and analyzed, the system for multi-channel synchronous acquisition of the array micro-CT imaging starts to operate all working components in the same imaging period.
In some examples, the system for multi-channel simultaneous acquisition of array micro-CT imaging may complete a previous image acquisition task, or the system for multi-channel simultaneous acquisition of array micro-CT imaging may cause each imaging system to be in a different imaging cycle for other reasons.
Before step S2 is executed, each imaging system should be adjusted to an initial state, or each imaging system is in a state of the same imaging period, so the system for multi-channel synchronous acquisition of array micro CT imaging needs to execute a step of unifying the system working timing.
After receiving a system working command transmitted from an upper system, the system for multi-channel synchronous acquisition of array micro-CT imaging can control all components to enter a preparation stage according to the system working command, that is, the states of all components are the states of the system working command to be executed, so that the system can synchronously and rapidly run after receiving the synchronous control command. Receiving from upper system
In some embodiments, the analyzing the system work order comprises: and identifying the data frame tail of each piece of data, and judging whether the data frame tail has the condition of data loss. And identifying the interframe of each piece of data, and judging that the received data is complete if new data is not received and at least one complete data frame tail is identified in a set first time period when the data is received.
And identifying the interframe of each piece of data, and judging that the received data is complete if new data is received within a set first time period when the data is received.
For example, when the multi-channel synchronous acquisition system for array micro-CT imaging receives a system work order, the system work order is received from the receiving system work order, for example, the data information of the data frame head where the system work order is detected to the data information of the data frame tail where the system work order is detected. Generally, a system operation command needs a certain time to complete the above operations, so that within a set first time period, for example, the first time period may be 50ms, only data information of a header and data information of a trailer of a data frame are detected, and it can be determined that the received system operation command does not lose data.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A multi-channel synchronous acquisition system for array micro CT imaging is characterized by comprising:
an X-ray source configured to provide X-rays;
a holder configured to fix an object to be imaged;
the imaging units are arranged in an array mode, and the X-ray source, the support and the imaging units are sequentially arranged on the same straight line;
the synchronous control unit is configured to receive a system work command containing a synchronous control instruction from an upper layer system and receive sequence information of a time frame where the imaging units are located, and the synchronous control unit is further configured to generate the synchronous control instruction according to the received system work command and the sequence information of the time frame and issue the synchronous control instruction to the imaging units.
2. The multi-channel simultaneous acquisition system for arrayed micro-CT imaging according to claim 1, wherein the simultaneous control unit comprises at least a microprocessor configured to receive the system operation commands containing simultaneous control instructions and the sequence information of the time frames, the microprocessor further configured to perform data processing on the received system operation commands and the sequence information, generate simultaneous control instructions and transmit the simultaneous control instructions to a plurality of the imaging units.
3. A multi-channel synchronous acquisition method for array micro-CT imaging, which is applied to the multi-channel synchronous acquisition system for array micro-CT imaging according to claim 1 or 2, wherein the multi-channel synchronous acquisition method for array micro-CT imaging comprises:
receiving a system work command transmitted from an upper system, and analyzing the system work command;
classifying the system work command containing the synchronous control command into a synchronous control command group;
analyzing the action commands to be executed in the corresponding imaging units by the system working commands in the synchronous control command group;
according to the action instruction needing to be executed, the corresponding imaging unit carries out system clock calibration, wherein the system clock calibration comprises the following steps: the imaging unit uploads sequence information of a time frame in which the current state is located to the synchronous control circuit, and the synchronous control circuit selects the time frame corresponding to the minimum sequence as a starting time frame;
the synchronous control circuit generates a synchronous control instruction according to the starting time frame and the action instruction to be executed, and synchronously sends the synchronous control instruction to the imaging unit corresponding to the system working command;
the synchronous control instruction comprises a work instruction which needs to be executed from a starting time frame to a last time frame in the system work order.
4. The multi-channel synchronous acquisition method for array micro-CT imaging according to claim 3, further comprising a system working timing calibration;
the calibration of the working time sequence of the system comprises that when the imaging unit images a single static object to be imaged, the imaging unit performs calibration of a system clock in a current imaging period once imaging is completed;
or, the calibration of the system working time sequence comprises that when the imaging unit continuously images the moving object to be imaged, the imaging unit performs calibration of the system clock in the current imaging period once within the time of completing the imaging period once.
5. The multi-channel synchronous acquisition method for array micro-CT imaging according to claim 3, further comprising unifying system operating timing;
the unified system operational timing sequence comprises: and after the system working command transmitted from the upper-layer system is received and analyzed, the system for multi-channel synchronous acquisition of the array micro-CT imaging starts to operate all working components in the same imaging period.
6. The multi-channel synchronous acquisition method for array micro-CT imaging according to claim 3, wherein said analyzing the system operating commands comprises:
identifying the data frame tail of each piece of data, and judging whether the data frame tail has the condition of data loss or not;
identifying the interframe of each piece of data, and judging that the received data is complete if new data is not received and at least one complete data frame tail is identified in a set first time period when the data is received;
and identifying the interframe of each piece of data, and judging that the received data is complete if new data is received within a set first time period when the data is received.
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