CN115951388A - Method and device for improving dynamic range of detector in real time in trigger mode - Google Patents
Method and device for improving dynamic range of detector in real time in trigger mode Download PDFInfo
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Abstract
The invention relates to a method and a device for improving the dynamic range of a detector in real time in a trigger mode, wherein the method comprises the following steps: generating an initial pulse signal synchronous with the first external trigger signal, and controlling the flat panel detector to read image data stream once by using the initial pulse signal; generating a frame of image by using a primary image data stream read out by a flat panel detector under the control of an initial pulse signal; generating a plurality of preset pulse signals in the interval time of two adjacent external trigger signals, and controlling the flat panel detector to read out image data stream once by using each pulse in the plurality of preset pulse signals; carrying out arithmetic mean processing on a plurality of image data streams read out by a flat panel detector under the control of a plurality of preset pulse signals to generate a frame of image; the invention has real-time performance compared with the prior art, can realize the improvement of the dynamic range without additional operation of a user, and greatly lightens the burden of the user.
Description
Technical Field
The invention relates to the technical field of improving the dynamic range of a detector, in particular to a method and a device for improving the dynamic range of the detector in real time in a trigger mode.
Background
The flat panel detector is a special radiation detection device for X-ray imaging, and is widely applied to the radiation imaging fields of oral CT, C-shaped arm, industrial nondestructive testing and the like. In the application of the flat panel detector, the density variation range of the shot object is generally large, so that high requirements are put on the dynamic range of the flat panel detector. For the user, the flat panel detector with higher dynamic range means clearer details and lower dose, and the methods for improving the dynamic range of the flat panel detector in the prior art are as follows:
the method comprises the steps of firstly, respectively collecting a gray value image under different gains by using flat panel detectors with different gains, then, carrying out certain judgment and selection on the gray value of each pixel point in different images, and finally, fusing the gray value selected by each pixel point into a final gray value image. In the final gray value image, the pixel points with weaker received light intensity usually adopt the image output gray scale under higher gain, and the pixel points with stronger received light intensity adopt the image output gray scale under lower gain. Because higher gain corresponds to better signal-to-noise ratio and lower gain corresponds to higher saturation dose, the dynamic range corresponding to the finally fused image is greatly improved. In this method, since the flat panel detector needs to design a plurality of gain stages, the yield of the core photoelectric conversion chips is greatly reduced, and at the same time, the gain of each pixel has a certain difference due to the manufacturing difference of the chips, so that the gain of each pixel needs to be corrected by matching with a very complicated gain correction method.
The second method is based on the idea of replacing single long integration time acquisition in the same time with multiple short integration time acquisitions. Flat panel detector systems typically use gigabit networks to transfer data, and due to the gigabit network bandwidth limitations, the frame rates used by users are typically less than the highest frame rates at which flat panel detectors can actually operate. When the flat panel detector actually operates at N times of the frame rate set by the user, since the integration time is reduced to 1/N, the saturation dose rate at this time will be increased by N times, and the corresponding dynamic range will also be increased by √ N times, where N is an integer greater than 1. The method has the advantages that the dynamic range can be improved by adjusting the actual running frame rate in the flat panel detector and performing certain program multi-frame superposition without designing a plurality of gain gears and a complex gain correction method.
The acquisition modes of the flat panel detector comprise a free mode and a trigger mode. In the free mode, a user firstly sets a frame rate, and then after the user sets a collection starting instruction, the flat panel detector continuously reads signals at the preset frame rate; in the trigger mode, after a user sets a start acquisition instruction, the user uses an external signal to control the flat panel detector to read out signals, and the trigger mode is divided into rising edge trigger, falling edge trigger, high level trigger, low level trigger and the like according to the difference of trigger time sequences.
Taking falling edge triggering as an example, after a user sets a start acquisition instruction, the user inputs a trigger signal from the outside of the flat panel detector, and when the flat panel detector receives the falling edge of the trigger signal, the flat panel detector immediately starts to read out the signal. Due to the line-by-line scanning reading mode of the flat panel detector, a certain reading time interval Tr exists in the reading of the flat panel detector, the time is directly related to the design of a core photoelectric conversion chip of the flat panel detector and is usually a fixed value in the same mode, the interval time of 2 adjacent falling edges of external trigger signals is called integration time, the integration time is controlled by a user and can be changed according to needs, and in the continuous radiation source exposure process, the integration time is positively related to the receiving dose of the flat panel detector.
Therefore, the implementation of the second method depends on the frame rate set by the user, and when the user uses the trigger mode, the frame rate is determined by the interval of the trigger signal input by the user, so that when the interval of the trigger signal input by the user is not appropriate, the second method cannot be effectively implemented.
The third method is the method mentioned in the patent application "a method and apparatus for improving the dynamic range of a flat panel detector in a trigger mode" provided by the applicant of the present invention, in which the addition of a detection module brings additional problems: firstly, the user only needs to output the image data after inputting the second trigger signal, and the application of the image data in a single-frame trigger scene is influenced; second, there is an extra time delay of one frame for outputting the image data compared to the conventional method.
Disclosure of Invention
In order to solve the problem that in the prior art, as a detector needs to be designed with a plurality of gain gears, the yield of a core photoelectric conversion chip is greatly reduced; the gain of each pixel is different due to the manufacturing difference of the chips, so the gain of each pixel needs to be corrected by matching with a quite complicated gain correction method, and higher requirements on the hardware performance of a user are provided; depending on the frame rate set by the user, when the user uses the trigger mode, the frame rate is determined by the trigger signal interval input by the user, and the dynamic range of the detector under the trigger mode cannot be effectively realized; the addition of a detection module brings with it some additional problems: firstly, the user only needs to output the image data after inputting the second trigger signal, and the application of the image data in a single-frame trigger scene is influenced; and secondly, compared with the traditional method, the technical problems that the output of the image data has extra time delay of one frame and the like are solved.
The technical scheme for solving the technical problems is as follows:
the method for improving the dynamic range of the detector in real time in the trigger mode comprises the following steps:
generating an initial pulse signal synchronous with the first external trigger signal, and controlling a flat panel detector to read image data stream once by using the initial pulse signal;
generating a frame of image by using a primary image data stream read out by the flat panel detector under the control of the initial pulse signal;
generating a plurality of preset pulse signals in the interval time of two adjacent external trigger signals, and controlling the flat panel detector to read out image data stream once by using each pulse in the plurality of preset pulse signals; the last preset pulse signal in the plurality of preset pulse signals is synchronous with the latter external trigger signal in the two adjacent external trigger signals;
and carrying out arithmetic average processing on a plurality of image data streams read out by the flat panel detector under the control of a plurality of preset pulse signals to generate a frame of image.
The invention has the beneficial effects that: an initial pulse signal synchronous with the first external trigger signal is generated, and the initial pulse signal is utilized to control the flat panel detector to read out an image data stream once, so that an output image of the flat panel detector is generated and controlled while the first external trigger signal is sent out. Generating a plurality of preset pulse signals within the interval time of two adjacent external trigger signals, controlling the flat panel detector to read out an image data stream once by using each pulse in the plurality of preset pulse signals, and performing arithmetic average processing on the plurality of image data streams read out by the flat panel detector under the control of the plurality of preset pulse signals to generate a frame of image; the method realizes that the traditional method reads out corresponding signals and image output in real time under the trigger of an external trigger signal, and improves the dynamic range; therefore, the method has the real-time property completely consistent with that of the traditional method, and can improve the dynamic range without additional operation of a user, thereby greatly lightening the burden of the user.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the initial pulse signal is consistent with the preset pulse signal in triggering mode; the trigger mode of the initial pulse signal or the preset pulse signal is rising edge trigger or falling edge trigger or high level trigger or low level trigger.
Further, the external trigger signal is a pulse signal, and the external trigger signal is consistent with the initial pulse signal or the preset pulse signal in trigger mode.
Further, in the plurality of preset pulse signals, the interval time between the first preset pulse signal and the previous trigger signal in two adjacent trigger signals is greater than or equal to the time for reading out the image data stream once by the flat panel detector.
Further, the interval time between two adjacent preset pulse signals is greater than or equal to the time of reading out the image data stream by the flat panel detector.
In order to solve the technical problems, the invention also provides a device for improving the dynamic range of the detector in real time in the trigger mode, and the specific technical scheme is as follows:
the device for improving the dynamic range of the detector in real time in the trigger mode comprises a trigger signal conversion module;
the trigger signal conversion module is used for generating an initial pulse signal synchronous with the first external trigger signal and controlling the flat panel detector to read out an image data stream once by using the initial pulse signal; the flat panel detector generates a frame of image from a primary image data stream read by the flat panel detector under the control of the initial pulse signal;
the trigger signal conversion module is further used for generating a plurality of preset pulse signals within the interval time of two adjacent external trigger signals, and controlling the flat panel detector to read out an image data stream once by using each pulse in the plurality of preset pulse signals; the last preset pulse signal in the plurality of preset pulse signals is synchronous with the latter external trigger signal in the two adjacent external trigger signals; and the flat panel detector performs arithmetic average processing on a plurality of image data streams read out by the flat panel detector under the control of a plurality of preset pulse signals to generate a frame of image.
Further, the initial pulse signal is consistent with the preset pulse signal in triggering mode; the trigger mode of the initial pulse signal or the preset pulse signal is rising edge trigger or falling edge trigger or high level trigger or low level trigger.
Further, the external trigger signal is a pulse signal, and the external trigger signal is consistent with the initial pulse signal or the preset pulse signal in trigger mode.
Further, in the plurality of preset pulse signals, the interval time between the first preset pulse signal and the previous trigger signal in two adjacent trigger signals is greater than or equal to the time for reading out the image data stream once by the flat panel detector.
Further, the interval time between two adjacent preset pulse signals is greater than or equal to the time for reading out the image data stream once by the flat panel detector.
Drawings
FIG. 1 is a block flow diagram illustrating a method for increasing the dynamic range of a detector in real time in a trigger mode according to an embodiment of the present invention;
FIG. 2 is a timing diagram illustrating falling edge triggering in accordance with a conventional method of the present invention;
FIG. 3 is a first falling edge trigger timing diagram of a method for increasing the dynamic range of a detector in real time in a trigger mode according to an embodiment of the present invention;
fig. 4 is a second falling edge trigger timing diagram of the method for increasing the dynamic range of the detector in real time in the trigger mode according to the embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention. The detector in the invention mainly refers to a flat panel detector.
Example 1
As shown in fig. 1, the present embodiment provides a method for increasing a dynamic range of a detector in real time in a trigger mode, including the following steps:
s1, generating an initial pulse signal synchronous with a first external trigger signal, and controlling a flat panel detector to read an image data stream once by using the initial pulse signal;
s2, generating a frame of image by using a primary image data stream read out by the flat panel detector under the control of the initial pulse signal;
s3, generating a plurality of preset pulse signals within the interval time of two adjacent external trigger signals, and controlling the flat panel detector to read out image data stream once by using each pulse in the preset pulse signals;
and in the plurality of preset pulse signals, the last preset pulse signal is synchronous with the latter external trigger signal in the two adjacent external trigger signals.
Specifically, in the plurality of preset pulse signals, an interval time between a first preset pulse signal and a previous trigger signal in two adjacent trigger signals is greater than or equal to a time for reading out an image data stream by the flat panel detector. The interval time between two adjacent preset pulse signals is larger than or equal to the time for reading out the image data stream once by the flat panel detector. The interval time between one preset pulse signal adjacent to the initial pulse signal and the initial pulse signal is larger than or equal to the time of reading out the image data stream once by the flat panel detector.
And S4, performing arithmetic average processing on a plurality of image data streams read out by the flat panel detector under the control of a plurality of preset pulse signals to generate a frame of image.
Preferably, the initial pulse signal is consistent with the preset pulse signal in triggering mode; the trigger mode of the initial pulse signal or the preset pulse signal is rising edge trigger or falling edge trigger or high level trigger or low level trigger. The external trigger signal is a pulse signal, and the external trigger signal is consistent with the initial pulse signal or the preset pulse signal in trigger mode.
The falling edge trigger indicates that the time interval between the falling edges of two adjacent pulses is integral time; the rising edge trigger indicates that the time interval between the rising edges of two adjacent pulses is integration time; the high level trigger represents that the duration of one high level pulse is the integration time; a low trigger indicates that a low pulse lasts for an integration time.
As shown in fig. 2, after the user sets the start acquisition instruction, the user inputs a trigger signal from outside the detector, and when the detector receives a falling edge of the trigger signal, the detector starts to read out the signal. Due to the line-by-line scanning reading mode of the detector, a certain reading time interval Tr exists in the reading of the detector, the time is directly related to the design of a photoelectric conversion chip of a detector core, the time is usually a fixed value in the same mode, the interval time of the falling edges of the adjacent 2 external trigger signals is called integration time, the integration time is controlled by a user and can be changed according to needs, and the integration time is positively related to the receiving dose of the detector in the continuous radiation source exposure process.
It can be seen that the implementation of the second method depends on the frame rate set by the user, and when the user uses the trigger mode, the frame rate is determined by the interval of the trigger signal input by the user, and at this time, the second method cannot be implemented effectively.
As shown in fig. 3, the method for improving the dynamic range of the detector in real time in the trigger mode specifically includes the following steps:
(1) the method comprises the following steps Setting a collection starting instruction;
(2) the method comprises the following steps Setting the jumping edge of the nth trigger signal, wherein each jumping edge of the trigger signal corresponds to a moment, namely the corresponding moment of the jumping edge of the 1 st trigger signal is k1, and the corresponding moment of the jumping edge of the nth trigger signal is kn; at a time k1, a trigger signal conversion module in the detector synchronously outputs a jump edge to control the detector to read a signal to read a primary image data stream, namely the initial image data, and an image corresponding to the 1 st trigger signal, namely the final image data, is generated by using the primary image data stream;
(3) the method comprises the following steps A user presets a coefficient N and time intervals T1 to T (N-1), after the moment k1, the internal trigger signal conversion module outputs N-1 pulses according to different time intervals T1 to T (N-1), and a corresponding detector reads out signals for N-1 times; the user preset coefficient N is a positive integer greater than or equal to 2.
(4) The method comprises the following steps At the time k2, the internal trigger signal conversion module synchronously outputs a jump edge to control the detector to read out a signal; the time interval T1 to T (N-1) preset by a user is greater than or equal to the signal reading time interval Tr;
(5) the method comprises the following steps Arithmetically averaging the image data streams of the N times in the steps (3) to (4) to generate an image corresponding to the 2 nd trigger signal, namely the final image data;
(6) the method comprises the following steps And (5) repeating the steps (3) to (5) until the user sets a collection stopping instruction.
When all the preset time intervals T1 to T (N-1) are equal to the ratio of the integral time T to the preset coefficient N, the dynamic range is increased to the maximum, and the dynamic range at the moment is increased by N times; when this condition is not satisfied, the effect of dynamic range enhancement will be determined by the maximum value of T1 to TN. The interval time of the adjacent 2 jump edges of the external trigger signal is called integration time, the integration time is controlled by a user and can be changed according to needs, and the integration time is positively correlated with the receiving dose of the detector in the continuous radiation source exposure process.
As shown in fig. 4, the trigger mode uses a falling edge mode, the user preset coefficient N is 2, the readout time of one frame image of the detector is 10ms, the user preset T1=10ms, the gigabit network limit transmission speed is 40fps, and the trigger signal interval set by the user is 25ms, under which condition, the corresponding specific steps are as follows:
s10, setting a collection starting instruction;
s11, setting the jumping edge moment of the nth trigger signal as kn, synchronously outputting a jumping edge control detector by an internal trigger signal conversion module at the moment k1 to read a signal, and generating an image corresponding to the 1 st trigger signal by using the image data stream, namely the final image data;
s12, after the time k1, 1 pulse is output by the internal trigger signal conversion module at an interval of 10ms, and 1 signal reading is performed on the corresponding detector;
s13, at the moment k2, the internal trigger signal conversion module synchronously outputs a jump edge to control the detector to read out a signal;
s14, arithmetically averaging the 2 times of image data streams in the steps S12 to S13 to generate an image corresponding to the 2 nd trigger signal, namely the final image data;
and S15, repeating the steps S12 to S14 until the user sets a collection stopping instruction.
Compared with the conventional method shown in fig. 2, it can be seen that the number of trigger signals input by the user is consistent with the output number of the image data streams, the image output time is also completely consistent, and there is no longer a delay of one frame of image time. Then, it can be seen that the integration time involved in 2 signal readouts is 10ms and 15ms respectively, which corresponds to the single 25ms integration time of the conventional method, and the charge generated by the exposure is not lost, and completely meets the user's use. Finally, the integration time is divided into 10ms and 15ms from 25ms, so that the saturation dose rate can be increased by 1.67 times, and the corresponding dynamic range is increased by 1.18 times.
The embodiment of the invention generates a plurality of trigger signals in advance through a trigger signal conversion module in the detector for signal reading of the detector, synchronously outputs the last trigger signal in the detector after the jumping edge of the external trigger signal actually arrives, and finally performs arithmetic average on image stream outputs corresponding to all the trigger signals to generate image output corresponding to the current trigger signal; the signal reading and image output are carried out after the jump edge of the external trigger signal in the traditional method, and the dynamic range is improved; therefore, the method has real-time property completely consistent with that of the traditional method, and can improve the dynamic range without additional operation of a user, thereby greatly lightening the burden of the user.
Example 2
Based on embodiment 1, this embodiment provides a device for increasing a dynamic range of a detector in real time in a trigger mode, and the device for increasing the dynamic range of the detector in real time in the trigger mode includes a trigger signal conversion module;
the trigger signal conversion module is used for generating an initial pulse signal synchronous with a first external trigger signal and controlling the flat panel detector to read out an image data stream for one time by using the initial pulse signal; the flat panel detector generates a frame of image from a primary image data stream read by the flat panel detector under the control of the initial pulse signal;
the trigger signal conversion module is further used for generating a plurality of preset pulse signals within the interval time of two adjacent external trigger signals, and controlling the flat panel detector to read out an image data stream once by using each pulse in the plurality of preset pulse signals; the last preset pulse signal in the plurality of preset pulse signals is synchronous with the latter external trigger signal in the two adjacent external trigger signals; and the flat panel detector performs arithmetic average processing on a plurality of image data streams read out by the flat panel detector under the control of a plurality of preset pulse signals to generate a frame of image.
The initial pulse signal and the preset pulse signal are triggered in the same way; the trigger mode of the initial pulse signal or the preset pulse signal is rising edge trigger or falling edge trigger or high level trigger or low level trigger. The external trigger signal is a pulse signal, and the external trigger signal is consistent with the initial pulse signal or the preset pulse signal in trigger mode.
In the plurality of preset pulse signals, the interval time between the first preset pulse signal and the previous trigger signal in two adjacent trigger signals is greater than or equal to the time for reading out the image data stream once by the flat panel detector. The interval time between two adjacent preset pulse signals is larger than or equal to the time for reading out the image data stream once by the flat panel detector.
In the embodiment, an initial pulse signal synchronous with the first external trigger signal is generated firstly, and the flat panel detector is controlled by the initial pulse signal to read out an image data stream once, so that an output image of the flat panel detector is generated and controlled at the same time when the first external trigger signal is sent out. Generating a plurality of preset pulse signals within the interval time of two adjacent external trigger signals, controlling the flat panel detector to read out an image data stream once by using each pulse in the plurality of preset pulse signals, and performing arithmetic average processing on the plurality of image data streams read out by the flat panel detector under the control of the plurality of preset pulse signals to generate a frame of image; the method realizes that the traditional method reads out corresponding signals and image output in real time under the trigger of an external trigger signal, and improves the dynamic range; therefore, the method has the real-time property completely consistent with that of the traditional method, and can improve the dynamic range without additional operation of a user, thereby greatly lightening the burden of the user.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The method for improving the dynamic range of the detector in real time in the trigger mode is characterized by comprising the following steps of:
generating an initial pulse signal synchronous with the first external trigger signal, and controlling a flat panel detector to read image data stream once by using the initial pulse signal;
generating a frame of image by using a primary image data stream read out by the flat panel detector under the control of the initial pulse signal;
generating a plurality of preset pulse signals in the interval time of two adjacent external trigger signals, and controlling the flat panel detector to read out an image data stream once by using each pulse in the plurality of preset pulse signals; the last preset pulse signal in the plurality of preset pulse signals is synchronous with the latter external trigger signal in the two adjacent external trigger signals;
and carrying out arithmetic average processing on a plurality of image data streams read out by the flat panel detector under the control of a plurality of preset pulse signals to generate a frame of image.
2. The method for improving the dynamic range of the detector in real time in the trigger mode according to claim 1, wherein the initial pulse signal is triggered in a manner consistent with the preset pulse signal; the trigger mode of the initial pulse signal or the preset pulse signal is rising edge trigger or falling edge trigger or high level trigger or low level trigger.
3. The method according to claim 2, wherein the external trigger signal is a pulse signal, and the external trigger signal is triggered in accordance with the initial pulse signal or the predetermined pulse signal.
4. The method according to claim 1, wherein an interval between a first preset pulse signal and a previous trigger signal of two adjacent trigger signals in the plurality of preset pulse signals is greater than or equal to a time for reading out an image data stream of the flat panel detector.
5. The method for improving the dynamic range of the detector in real time under the trigger mode according to any one of claims 1 to 4, wherein the interval time between two adjacent preset pulse signals is greater than or equal to the time for reading out the image data stream of the flat panel detector.
6. The device for improving the dynamic range of the detector in real time in the trigger mode is characterized by comprising a trigger signal conversion module;
the trigger signal conversion module is used for generating an initial pulse signal synchronous with the first external trigger signal and controlling the flat panel detector to read out an image data stream once by using the initial pulse signal; the flat panel detector generates a frame of image from a primary image data stream read by the flat panel detector under the control of the initial pulse signal;
the trigger signal conversion module is further used for generating a plurality of preset pulse signals within the interval time of two adjacent external trigger signals, and controlling the flat panel detector to read out an image data stream once by using each pulse in the plurality of preset pulse signals; the last preset pulse signal in the plurality of preset pulse signals is synchronous with the latter external trigger signal in the two adjacent external trigger signals; and the flat panel detector performs arithmetic average processing on a plurality of image data streams read out by the flat panel detector under the control of a plurality of preset pulse signals to generate a frame of image.
7. The device for improving the dynamic range of the detector in real time in the trigger mode according to claim 6, wherein the initial pulse signal is consistent with the preset pulse signal in trigger mode; the trigger mode of the initial pulse signal or the preset pulse signal is rising edge trigger or falling edge trigger or high level trigger or low level trigger.
8. The apparatus according to claim 7, wherein the external trigger signal is a pulse signal, and the external trigger signal is triggered in a manner consistent with the initial pulse signal or the predetermined pulse signal.
9. The apparatus according to claim 6, wherein the interval between a first preset pulse signal and a previous trigger signal of two adjacent trigger signals in the preset pulse signals is greater than or equal to the time for reading out an image data stream of the flat panel detector.
10. The apparatus according to any one of claims 6 to 9, wherein the interval time between two adjacent preset pulse signals is greater than or equal to the time for reading out an image data stream of the flat panel detector.
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| CN117459657A (en) * | 2023-12-18 | 2024-01-26 | 合肥埃科光电科技股份有限公司 | Multi-image acquisition device synchronization method, system, electronic equipment and storage medium |
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| CN117459657A (en) * | 2023-12-18 | 2024-01-26 | 合肥埃科光电科技股份有限公司 | Multi-image acquisition device synchronization method, system, electronic equipment and storage medium |
| CN117459657B (en) * | 2023-12-18 | 2024-03-26 | 合肥埃科光电科技股份有限公司 | Multi-image acquisition device synchronization method, system, electronic equipment and storage medium |
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