CN108926356B - Detector photon arrival information determination method and device and medical equipment - Google Patents
Detector photon arrival information determination method and device and medical equipment Download PDFInfo
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- CN108926356B CN108926356B CN201810553188.0A CN201810553188A CN108926356B CN 108926356 B CN108926356 B CN 108926356B CN 201810553188 A CN201810553188 A CN 201810553188A CN 108926356 B CN108926356 B CN 108926356B
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- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/42—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis
- A61B6/4208—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector
- A61B6/4241—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector using energy resolving detectors, e.g. photon counting
Abstract
The application relates to a detector photon arrival information determination method, a detector photon arrival information determination device, medical equipment and a storage medium. The method comprises the following steps: constructing a virtual pixel between any preset number of adjacent real pixels; and when the signal amplitude of the virtual pixel exceeds a set threshold, acquiring a real pixel with the maximum signal amplitude from the preset number of adjacent real pixels and the adjacent real pixels as a central pixel, and taking the position of the central pixel as a photon arrival position. By adopting the method, the arrival position of the photon can be accurately determined, the interference of electron cloud generated by the photon is eliminated, the arrival position of the photon is more accurately judged, and the imaging quality can be further improved.
Description
Technical Field
The present application relates to the technical field of medical devices, and in particular, to a method and an apparatus for determining photon arrival information of a detector, a medical device, and a storage medium.
Background
With the development of medical equipment technology, photon counting energy spectrum CT technology has come into play in order to reduce the radiation dose of patients and improve the CT quantitative analysis. Photon counting energy spectrum CT has the function of analyzing material components and has the advantages of reducing the radiation to the patient, etc. Development of photon counting energy spectrum CT has become one of the next generation CT development directions which are concerned by both academic circles and industrial circles at home and abroad. X-ray Photon Counting Detector (PCD) technology is a key that limits the development of photon counting energy spectrum CT.
In the conventional art at present, the pixel size of the X-ray photon counting detector is typically only a few hundred micrometers (100-. When the detector pixel size is small, an electron cloud generated by an X-photon may be collected by an adjacent detector pixel, so that the photon arrival position and the photon arrival time of the photon collected by the detector are erroneously determined, thereby affecting the imaging quality.
Disclosure of Invention
In view of the above, it is necessary to provide a detector photon arrival information determination method, apparatus, medical device, and storage medium capable of accurately determining a photon arrival position in order to solve the above technical problems.
A method of detector photon arrival information determination, the method comprising: constructing a virtual pixel between any preset number of adjacent real pixels; and when the signal amplitude of the virtual pixel exceeds a set threshold, acquiring a real pixel with the maximum signal amplitude from the preset number of adjacent real pixels and the adjacent real pixels as a central pixel, and taking the position of the central pixel as a photon arrival position.
In one embodiment, the virtual pixel has a corresponding relationship with one of the preset number of adjacent real pixels; when the signal amplitude of the virtual pixel exceeds a set threshold, acquiring a real pixel with the maximum signal amplitude from the preset number of adjacent real pixels and the real pixels adjacent to the preset number of adjacent real pixels as a central pixel, and taking the position of the central pixel as a photon arrival position, including: when the signal amplitude of the virtual pixel exceeds a set threshold value, taking a real pixel having a corresponding relation with the virtual pixel and a plurality of adjacent real pixels taking the real pixel having the corresponding relation as a center as pixels to be compared, and sending a request instruction to the pixels to be compared; respectively comparing the pixel to be compared with the adjacent real pixels according to the request instruction to obtain the real pixel with the maximum signal amplitude as the central pixel of the corresponding area; and comparing the central pixels of the plurality of regions to obtain a real pixel with the maximum signal amplitude as a central pixel, and taking the position of the central pixel as the arrival position of the photon.
In one embodiment, the preset number is four; the virtual pixel has a corresponding relationship with a real pixel at a lower right position of the virtual pixel.
In one embodiment, the signals of the virtual pixels are superimposed by the signals of the preset number of adjacent real pixels.
In one embodiment, the taking, as pixels to be compared, a real pixel having a correspondence relationship with the virtual pixel and a plurality of adjacent real pixels centered on the real pixel having the correspondence relationship, includes: and taking a real pixel having a corresponding relation with the virtual pixel and eight adjacent real pixels taking the real pixel having the corresponding relation as a center as a pixel to be compared.
In one embodiment, the comparing the pixel to be compared with its neighboring real pixels according to the request instruction respectively includes: and comparing the pixel to be compared with the four real pixels on the pixel to be compared independently according to the request instruction.
In one embodiment, the method further comprises: marking the virtual pixel's time-to-threshold as a photon arrival time.
A detector photon arrival information determination apparatus, the apparatus comprising: the virtual pixel construction module is used for constructing a virtual pixel between any preset number of adjacent real pixels; and the photon arrival position determining module is used for acquiring a real pixel with the maximum signal amplitude from the preset number of adjacent real pixels and the real pixels adjacent to the real pixels as a central pixel when the signal amplitude of the virtual pixel exceeds a set threshold, and taking the position of the central pixel as the photon arrival position.
A medical apparatus comprising a memory and a processor, the memory storing a computer program which when executed by the processor effects the steps of:
constructing a virtual pixel between any preset number of adjacent real pixels;
and when the signal amplitude of the virtual pixel exceeds a set threshold, acquiring a real pixel with the maximum signal amplitude from the preset number of adjacent real pixels and the adjacent real pixels as a central pixel, and taking the position of the central pixel as a photon arrival position.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
constructing a virtual pixel between any preset number of adjacent real pixels;
and when the signal amplitude of the virtual pixel exceeds a set threshold, acquiring a real pixel with the maximum signal amplitude from the preset number of adjacent real pixels and the adjacent real pixels as a central pixel, and taking the position of the central pixel as a photon arrival position.
According to the detector photon arrival information determining method and device, the medical equipment and the storage medium, the simulation pixels are constructed among any preset number of adjacent real pixels, when the signal amplitude of the simulation pixels exceeds the set threshold, the real pixel with the maximum amplitude is obtained from the real pixels constructing the virtual pixels and the adjacent real pixels, and the position of the central pixel is the photon arrival position. By comparing the signal amplitudes of a plurality of real pixels, and taking the real pixel position with the maximum amplitude as the photon arrival position. The position that can accurate definite photon arrived has got rid of the interference of the electron cloud that the photon produced, makes the photon arrive more accurate that the position judges, further can improve the formation of image quality.
Drawings
FIG. 1 is a schematic flow chart of a method for determining detector photon arrival information in one embodiment;
FIG. 2 is a schematic flow chart of a method for determining detector photon arrival information in another embodiment;
FIG. 3 is a schematic flow chart of a method for determining detector photon arrival information in another embodiment;
FIG. 4 is a diagram of real pixels and dummy pixels in one embodiment;
FIG. 5 is a diagram illustrating photon arrival information determination for a real pixel receiving a photon in one embodiment;
FIG. 6 is a diagram illustrating photon arrival information determination for photons received by a plurality of real pixels in one embodiment;
FIG. 7 is a block diagram of a detector photon arrival information determining apparatus in one embodiment;
FIG. 8 is a block diagram of the structure of a photon arrival location determination module in one embodiment;
FIG. 9 is a diagram illustrating an internal structure of a medical device according to an exemplary embodiment.
Reference numerals: 100 is a detector photon arrival information determination device, 110 is a virtual pixel construction module, 120 is a photon arrival position determination module, 121 is a corresponding relation determination unit, 122 is a pixel determination unit to be compared, 123 is a comparison unit, 124 is a photon arrival position determination unit, and 130 is a photon arrival time determination module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, there is provided a detector photon arrival information determination method, comprising the steps of:
step S102, a virtual pixel is constructed between any preset number of adjacent real pixels.
In particular, a radiation detector in a medical apparatus is a device that converts the energy of radiation into an electrical signal. The detector receives the radiation irradiation and converts the radiation intensity of the radiation into an electric signal, and the medical equipment generates an image through the electric signal. Wherein the detector is composed of a plurality of real pixels. Each of the real pixels is capable of receiving radiation and converting the radiation intensity of the radiation into an electrical signal. The virtual pixels are virtual pixels constructed between any preset number of adjacent real pixels, wherein every two of the preset number of real pixels are adjacent to each other to form a rectangle.
Step S104, when the signal amplitude of the virtual pixel exceeds the set threshold, acquiring the real pixel with the maximum signal amplitude from the preset number of adjacent real pixels and the real pixels adjacent to the real pixels as a central pixel, and taking the position of the central pixel as the photon arrival position.
Specifically, the signal of the real pixel is an electric signal into which the real pixel converts the radiation intensity of the ray. The signals of the virtual pixels are the superposition of the signals of a preset number of adjacent real pixels. I.e. the superposition of the electrical signals of a preset number of real pixels constructing a virtual pixel. By setting a proper virtual pixel signal threshold, the time of the ray photon reaching the real pixel can be accurately determined, and the position can be determined at the accurate time, so that the position can be more accurately determined. When the signal amplitude of the virtual pixel exceeds a set threshold value, namely at the moment when the ray photon reaches the real pixel, in the real pixel constructing the virtual pixel and the adjacent real pixel, the real pixel with the maximum signal amplitude is searched as a central pixel, and the position of the central pixel is the arrival position of the photon.
In the method for determining the photon arrival information of the detector, the position of the real pixel with the maximum signal amplitude is searched as the arrival position of the photon in the real pixel constructing the virtual pixel and the adjacent real pixels thereof. The real pixels generate electric signals when receiving photon clouds formed by photons, and the electron clouds formed by the photons can be absorbed by a plurality of real pixels at the same time, so that the position of the real pixel with the maximum amplitude in the real pixels is selected as the photon arrival position, and the photon arrival position can be determined more accurately.
In one embodiment, as shown in fig. 2, there is provided a detector photon arrival information determination method, comprising the steps of:
in step S202, a virtual pixel is constructed between any preset number of adjacent real pixels.
In particular, the detector of the medical device is a matrix consisting of a plurality of real pixels. Each of the real pixels is capable of receiving radiation and converting the radiation intensity of the radiation into an electrical signal. The virtual pixels are virtual pixels constructed between any preset number of adjacent real pixels, wherein every two of the preset number of real pixels are adjacent to each other to form a rectangle.
And step S204, when the signal amplitude of the virtual pixel exceeds a set threshold, marking the threshold-crossing time of the virtual pixel as the photon arrival time.
Specifically, the real pixels receive the radiation irradiation and convert the radiation intensity of the radiation into an electrical signal. And superposing the signals of the real pixels with the preset number for constructing the virtual pixels to obtain the signals of the virtual pixels. And judging the time of the ray photon reaching the real pixel by using the signal amplitude of the virtual pixel. When the signal of the virtual pixel exceeds a preset threshold, the time exceeding the preset threshold is taken as the arrival time of the photon.
Step S206, a real pixel with the largest signal amplitude is obtained from the preset number of adjacent real pixels and the real pixels adjacent to the real pixels as a central pixel, and the position of the central pixel is used as the photon arrival position.
Specifically, when the signal amplitude of the virtual pixel exceeds a set threshold and the time when the signal of the virtual pixel exceeds the threshold is marked as the photon arrival time, the real pixel with the maximum signal amplitude is searched as a central pixel in the real pixel constructing the virtual pixel and the adjacent real pixels, and the position of the central pixel is the photon arrival position.
In the method for determining the photon arrival information of the detector, the signals of the real pixels for constructing the virtual pixels are superposed to obtain the signals of the virtual pixels, and the photon arrival time is determined by utilizing the signals of the virtual pixels, so that the determination of the photon arrival time can be more accurate. When the signal of the virtual pixel exceeds the threshold value, the signal of the real pixel is still at the rising edge, and when the signal of the virtual pixel exceeds the threshold value and then the signal of the real pixel is compared, the signal of the real pixel reaches the amplitude value, so that the accuracy of the comparison result is ensured, and the arrival time and the arrival position of photons can be more accurately determined.
In one embodiment, as shown in fig. 3, a detector photon arrival information determination method is provided, and a virtual pixel may have a correspondence relationship with any one of real pixels constructing the virtual pixel. Specifically, the method can be as follows: the virtual pixel has a corresponding relation with a real pixel at the lower right position of the virtual pixel; the virtual pixel has a corresponding relation with a real pixel at the upper right position of the virtual pixel; the virtual pixel has a corresponding relation with a real pixel at the lower left position of the virtual pixel; the virtual pixel has a corresponding relationship with the real pixel at the upper left position of the virtual pixel. And when the corresponding relation is used for determining the arrival position of the photon, sending a request instruction to the real pixel of which the virtual pixel has the corresponding relation and the adjacent real pixels taking the real pixel with the corresponding relation as the center. The detector photon arrival information determination method comprises the following steps:
in step S302, a virtual pixel is constructed between any preset number of adjacent real pixels.
In particular, a radiation detector in a medical apparatus is a device that converts the energy of radiation into an electrical signal. The detector receives the radiation irradiation and converts the radiation intensity of the radiation into an electric signal, and the medical equipment generates an image through the electric signal. Wherein the detector is a matrix consisting of a plurality of real pixels. Each of the real pixels is capable of receiving radiation and converting the radiation intensity of the radiation into an electrical signal. The virtual pixel is a virtual pixel constructed between any preset number of adjacent real pixels. More specifically, the preset number is four, that is, the virtual pixel is a virtual pixel constructed by any four adjacent real pixels. The preset number of real pixels are adjacent in pairs to form a rectangle, namely the four adjacent real pixels are adjacent in pairs to form the rectangle.
Step S304, when the signal amplitude of the virtual pixel exceeds a set threshold, marking the threshold crossing time of the virtual pixel as photon arrival time, taking a real pixel having a corresponding relation with the virtual pixel and a plurality of adjacent real pixels taking the real pixel having the corresponding relation as a center as pixels to be compared, and sending a request instruction to the pixels to be compared.
Specifically, real pixels receive radiation exposure and convert the radiation intensity of the radiation into electrical signals. And superposing the signals of the real pixels with the preset number for constructing the virtual pixels to obtain the signals of the virtual pixels. And judging the time of the ray photon reaching the real pixel by using the signal amplitude of the virtual pixel. When the signal of the virtual pixel exceeds a preset threshold, the time exceeding the preset threshold is taken as the arrival time of the photon. When the signal of the virtual pixel exceeds a preset threshold value, a real pixel having a corresponding relation with the virtual pixel and an adjacent real pixel taking the real pixel having the corresponding relation as a center are taken as pixels to be compared, and a request instruction is sent to the pixels to be compared.
Wherein the neighboring real pixel centered on the real pixel having the correspondence relationship is the neighboring eight real pixels centered on the real pixel having the correspondence relationship. More specifically, it may be: when the virtual pixel has a corresponding relation with the real pixel at the lower right position of the virtual pixel, taking the real pixel at the lower right position of the virtual pixel and eight adjacent real pixels thereof as pixels to be compared; when the virtual pixel has a corresponding relation with the real pixel at the upper right position of the virtual pixel, taking the real pixel at the upper right position of the virtual pixel and eight adjacent real pixels thereof as pixels to be compared; when the virtual pixel has a corresponding relation with the real pixel at the lower left position of the virtual pixel, taking the real pixel at the lower left position of the virtual pixel and eight adjacent real pixels thereof as pixels to be compared; when the virtual pixel has a corresponding relationship with the real pixel at the upper left position of the virtual pixel, the real pixel at the upper left position of the virtual pixel and the eight real pixels adjacent thereto are taken as pixels to be compared. The request instruction is used for controlling each pixel to be compared to compare the signal of the current real pixel with the signal of the adjacent real pixel.
Step S306, comparing the pixel to be compared with the adjacent real pixel according to the request instruction, and obtaining the real pixel with the maximum signal amplitude as the central pixel of the corresponding area.
Specifically, after the pixels to be compared receive the request instruction, each pixel to be compared is independently compared with the adjacent real pixels in signal amplitude, and one real pixel with the largest signal amplitude is selected as the central pixel of the corresponding area in the comparison area of each pixel to be compared.
When the virtual pixel and the real pixel at the lower right position of the virtual pixel have a corresponding relation, the real pixel at the lower right position of the virtual pixel and eight adjacent real pixels are used as pixels to be compared, each pixel to be compared is independently compared with four real pixels at the upper left position, the lower left position and the lower left position of the pixel to be compared respectively, and one real pixel with the largest signal amplitude is selected as a central pixel of a corresponding area in a comparison area of each pixel to be compared.
When the virtual pixel and the real pixel at the upper right position of the virtual pixel have a corresponding relation, the real pixel at the upper right position of the virtual pixel and eight adjacent real pixels are used as pixels to be compared, each pixel to be compared is independently compared with four real pixels at the lower position, the lower left position and the upper left position of the pixel to be compared respectively, and one real pixel with the largest signal amplitude is selected as a central pixel of a corresponding area in a comparison area of each pixel to be compared.
When the virtual pixel and the real pixel at the lower left position of the virtual pixel have a corresponding relation, the real pixel at the lower left position of the virtual pixel and eight adjacent real pixels are used as pixels to be compared, each pixel to be compared is independently compared with four real pixels at the upper, upper right, lower right positions of the pixel to be compared, and a real pixel with the largest signal amplitude is selected as a central pixel of a corresponding area in a comparison area of each pixel to be compared.
When the virtual pixel and the real pixel at the upper left position of the virtual pixel have a corresponding relation, the real pixel at the upper left position of the virtual pixel and eight adjacent real pixels are used as pixels to be compared, each pixel to be compared is independently compared with four real pixels at the lower, lower right, upper right positions of the pixel to be compared respectively, and one real pixel with the largest signal amplitude is selected as a central pixel of a corresponding area in a comparison area of each pixel to be compared.
Step S308, comparing the central pixels of the plurality of areas to obtain a real pixel with the maximum signal amplitude as a central pixel, and taking the position of the central pixel as the photon arrival position.
Specifically, each pixel to be compared is independently compared with four adjacent real pixels, and the real pixel with the largest signal amplitude in the comparison area of each pixel to be compared is taken as the central pixel of the corresponding area. And comparing the central pixels of the corresponding areas again, and taking the real pixel with the maximum signal amplitude in the central pixels of the corresponding areas as the central pixel, wherein the position of the central pixel is the arrival position of the photon.
More specifically, a real pixel having a corresponding relationship with the virtual pixel and eight adjacent real pixels centering on the real pixel having the corresponding relationship are used as pixels to be compared, each pixel to be compared is independently compared with the adjacent real pixel to obtain nine corresponding area center pixels, then the nine corresponding area center pixels are compared, the real pixel having the largest signal amplitude in the nine corresponding area center pixels is used as the center pixel, and the position of the center pixel is the photon arrival position.
In the method for determining the photon arrival information of the detector, the processor of the real pixel can transmit the acquired signal of the real pixel to the processor of the medical equipment, the processor of the real pixel corresponding to the virtual pixel superposes the signal of the real pixel constructing the virtual pixel to obtain a virtual pixel signal, and the virtual pixel signal is transmitted to the processor of the medical equipment. The processor of the medical equipment judges whether the virtual pixel signal exceeds a set threshold value, when the virtual pixel signal exceeds the set threshold value, the time when the signal amplitude exceeds the set threshold value is used as photon arrival time, the processor of the medical equipment sends a request instruction to the processor of the real pixel corresponding to the pixel to be compared, after the processor of the real pixel corresponding to the pixel to be compared receives the request instruction, each pixel to be compared is independently compared with the real pixel adjacent to the pixel to be compared to obtain a plurality of corresponding area central pixels with the maximum signal amplitude, then the plurality of corresponding area central pixels are compared to obtain the central pixel with the maximum signal amplitude, and the position of the central pixel is used as the photon arrival position.
The processor of the medical device may also transmit the acquired signal of the real pixel to the processor of the medical device, the processor of the medical device superimposes the signal of the real pixel constructing the virtual pixel to obtain a virtual pixel signal, determine whether the virtual pixel signal exceeds a set threshold, when the virtual pixel signal exceeds the set threshold, take the time when the signal amplitude exceeds the set threshold as the photon arrival time, and the processor of the medical device compares each pixel to be compared with its own adjacent real pixel independently to obtain a plurality of corresponding area center pixels with the largest signal amplitude, and then compares the plurality of corresponding area center pixels to obtain a center pixel with the largest signal amplitude, and takes the position of the center pixel as the photon arrival position. That is, the method for determining the photon arrival information of the detector can be completely operated in a processor of the medical device, or can be completed by the cooperation of the processor of the real pixel and the processor of the medical device. In this embodiment, the running processor is not specifically limited, and only the calculation method described above needs to be completed.
The method for determining the photon arrival information of the detector can accurately determine the photon arrival time according to the virtual pixel threshold crossing time. By comparing the signal amplitudes, the real pixel with the largest signal amplitude is taken as the central pixel, the position of the central pixel is taken as the photon arrival position, the photon arrival position can be accurately determined, the interference of electron cloud generated by photons is eliminated, the photon arrival position judgment is more accurate, and the imaging quality can be further improved.
As shown in fig. 4, a schematic diagram of a virtual Pixel and a real Pixel is provided, wherein each Pixel represents a real Pixel. Pixel1, Pixel2, Pixel3 and Pixel4 in the figure are constructed as a virtual Pixel. The signal of the virtual Pixel is a superposition of the signal of Pixel1, the signal of Pixel2, the signal of Pixel3, and the signal of Pixel 4. If the final calculation result is that Pixel4 is the center Pixel, then the position of this real Pixel of Pixel4 is the arrival position of the photon.
As shown in fig. 5, a method for determining the position of a photon-generated electron cloud received by a real pixel is provided, wherein when 100% of the photon-generated electron cloud is received by the number 13 real pixel, the virtual pixel having a signal amplitude exceeding a set threshold value includes: 7. virtual pixels constructed by No. 8, 12 and 13 real pixels, virtual pixels constructed by No. 8, 9, 13 and 14 real pixels, virtual pixels constructed by No. 12, 13, 17 and 18 real pixels and virtual pixels constructed by No. 13, 14, 18 and 19 real pixels. It is exemplified that the virtual pixel has a corresponding relationship with the real pixel at the lower right position of the virtual pixel. Then the signal amplitude of the virtual pixel corresponding to the number 13 real pixel, the virtual pixel corresponding to the number 14 real pixel, the virtual pixel corresponding to the number 18 real pixel, and the virtual pixel corresponding to the number 19 real pixel exceeds the set threshold. Comparing a pixel to be compared of the virtual pixel with an adjacent real pixel to obtain a central pixel of the area, comparing the central pixel of the area to obtain a No. 13 real pixel as the central pixel, finally determining the position of the No. 13 real pixel as a photon arrival position, and determining the time when the signal amplitude of the virtual pixel exceeds a set threshold as the photon arrival time.
As shown in fig. 6, a position determination method is provided in which photon-generated electron clouds are received by a plurality of real pixels, when the photon-generated electron clouds are 50% received by the number 13 real pixel, 20% received by the number 14 real pixel, 10% received by the number 18 real pixel, and 20% received by the number 19 real pixel. The virtual pixel that receives the photon at this time includes: 7. virtual pixels constructed by No. 8, 12 and 13 real pixels receive 50 percent of photon electron cloud, virtual pixels constructed by No. 8, 9, 13 and 14 real pixels receive 70 percent of photon electron cloud, virtual pixels constructed by No. 9, 10, 14 and 15 real pixels receive 20 percent of photon electron cloud, virtual pixels constructed by No. 12, 13, 17 and 18 real pixels receive 60 percent, 13 and 14 percent of photon electron cloud, 18. virtual pixels built by real pixels No. 19 receive 100% of the photon electron cloud, virtual pixels built by real pixels No. 14, 15, 19, 20 receive 40% of the photon electron cloud, virtual pixels built by real pixels No. 17, 18, 22, 23 receive 10% of the photon electron cloud, virtual pixels built by real pixels No. 18, 19, 23, 24 receive 30% of the photon electron cloud, and virtual pixels built by real pixels No. 19, 20, 24, 25 receive 20% of the photon electron cloud. The virtual pixel with the signal amplitude exceeding the set threshold comprises: 8. virtual pixels constructed by real pixels 9, 13 and 14 receive 70% of photon electron cloud, virtual pixels constructed by real pixels 12, 13, 17 and 18 receive 60% of photon electron cloud, and virtual pixels constructed by real pixels 13, 14, 18 and 19 receive 100% of photon electron cloud. It is exemplified that the virtual pixel has a corresponding relationship with the real pixel at the lower right position of the virtual pixel. Then the signal amplitude of the virtual pixel corresponding to the 14 th real pixel, the virtual pixel corresponding to the 18 th real pixel, and the virtual pixel corresponding to the 19 th real pixel exceeds the set threshold. Comparing a pixel to be compared of the virtual pixel with an adjacent real pixel to obtain a central pixel of the area, comparing the central pixel of the area to obtain a No. 13 real pixel as the central pixel, finally determining the position of the No. 13 real pixel as a photon arrival position, and determining the time when the signal amplitude of the virtual pixel exceeds a set threshold as the photon arrival time.
It should be understood that although the various steps in the flow charts of fig. 1-3 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1-3 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternating with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 7, there is provided a detector photon arrival information determining apparatus 100 including: a virtual pixel construction module 110, a photon arrival position determination module 120, and a photon arrival time determination module 130, wherein:
the virtual pixel constructing module 110 is configured to construct a virtual pixel between any preset number of adjacent real pixels.
And a photon arrival position determining module 120, configured to, when the signal amplitude of the virtual pixel exceeds a set threshold, obtain, as a central pixel, a real pixel with a largest signal amplitude from among a preset number of adjacent real pixels and real pixels adjacent to the real pixel, and take a position of the central pixel as a photon arrival position.
A photon arrival time determination module 130 for marking the threshold crossing time of the virtual pixel as a photon arrival time.
As shown in fig. 8, a block diagram of a photon arrival position determination module 120 is provided, wherein the photon arrival position determination module 120 includes: a correspondence determining unit 121, a pixel-to-be-compared determining unit 122, a comparing unit 123, and a photon arrival position determining unit 124.
A correspondence determining unit 121, configured to determine that the virtual pixel has a correspondence with one of a preset number of adjacent real pixels.
A pixel-to-be-compared determining unit 122, configured to, when the signal amplitude of the virtual pixel exceeds the set threshold, send a request instruction to the pixel-to-be-compared, using, as the pixel-to-be-compared, a real pixel having a correspondence relationship with the virtual pixel and a plurality of adjacent real pixels centered on the real pixel having the correspondence relationship.
And the comparing unit 123 is configured to compare the pixel to be compared with the adjacent real pixels according to the request instruction, and obtain a real pixel with the largest signal amplitude as a central pixel of the corresponding area.
And the photon arrival position determining unit 124 is configured to compare central pixels of the multiple regions, obtain a real pixel with a largest signal amplitude as a central pixel, and use the position of the central pixel as a photon arrival position.
The pixel-to-be-compared determining unit 122 is further configured to use a real pixel having a corresponding relationship with the virtual pixel and eight adjacent real pixels centered on the real pixel having the corresponding relationship as pixels to be compared.
And the comparison unit 123 is further configured to compare the pixel to be compared with its own four pixels, namely, the upper left pixel, the lower left pixel and the lower left pixel, according to the request instruction.
Specific limitations regarding the detector photon arrival information determining apparatus 100 can be found in the above limitations regarding the detector photon arrival information determining method, which are not described herein again. The various modules in the detector photon arrival information determination apparatus 100 described above may be implemented in whole or in part by software, hardware, and combinations thereof. The modules can be embedded in a hardware form or independent from a processor in the medical equipment, and can also be stored in a memory in the medical equipment in a software form, so that the processor can call and execute the corresponding operations of the modules.
In one embodiment, a medical device is provided, which may be a radiation detection device, the internal structure of which may be as shown in fig. 9. The medical device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the medical device is configured to provide computing and control capabilities. The memory of the medical device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the medical device is used for connecting and communicating with an external terminal through a network. The computer program is executed by a processor to implement a method of detector photon arrival information determination. The display screen of the medical equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the medical equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the medical equipment, an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the configuration shown in fig. 9 is a block diagram of only a portion of the configuration associated with the present application and does not constitute a limitation on the medical device to which the present application is applied, and that a particular medical device may include more or less components than those shown, or combine certain components, or have a different arrangement of components.
In one embodiment, a medical device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor when executing the computer program implementing the steps of:
constructing a virtual pixel between any preset number of adjacent real pixels; and when the signal amplitude of the virtual pixel exceeds a set threshold, acquiring a real pixel with the maximum signal amplitude from a preset number of adjacent real pixels and the real pixels adjacent to the real pixels as a central pixel, and taking the position of the central pixel as a photon arrival position.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
constructing a virtual pixel between any preset number of adjacent real pixels; when the signal amplitude of the virtual pixel exceeds a set threshold value, marking the threshold-crossing time of the virtual pixel as the photon arrival time; and acquiring a real pixel with the maximum signal amplitude from a preset number of adjacent real pixels and the real pixels adjacent to the real pixels as a central pixel, and taking the position of the central pixel as a photon arrival position.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
constructing a virtual pixel between any preset number of adjacent real pixels; the virtual pixel has a corresponding relation with one of the adjacent real pixels with a preset number; when the signal amplitude of the virtual pixel exceeds a set threshold value, marking the threshold crossing time of the virtual pixel as photon arrival time, taking a real pixel having a corresponding relation with the virtual pixel and a plurality of adjacent real pixels taking the real pixel having the corresponding relation as a center as pixels to be compared, and sending a request instruction to the pixels to be compared; respectively comparing the pixel to be compared with the adjacent real pixels according to the request instruction to obtain the real pixel with the maximum signal amplitude as the central pixel of the corresponding area; and comparing the central pixels of the plurality of regions to obtain a real pixel with the maximum signal amplitude as a central pixel, and taking the position of the central pixel as the arrival position of the photon.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
constructing a virtual pixel between any preset number of adjacent real pixels; and when the signal amplitude of the virtual pixel exceeds a set threshold, acquiring a real pixel with the maximum signal amplitude from a preset number of adjacent real pixels and the real pixels adjacent to the real pixels as a central pixel, and taking the position of the central pixel as a photon arrival position.
In one embodiment, the computer program when executed by the processor further performs the steps of:
constructing a virtual pixel between any preset number of adjacent real pixels; when the signal amplitude of the virtual pixel exceeds a set threshold value, marking the threshold-crossing time of the virtual pixel as the photon arrival time; and acquiring a real pixel with the maximum signal amplitude from a preset number of adjacent real pixels and the real pixels adjacent to the real pixels as a central pixel, and taking the position of the central pixel as a photon arrival position.
In one embodiment, the computer program when executed by the processor further performs the steps of:
constructing a virtual pixel between any preset number of adjacent real pixels; the virtual pixel has a corresponding relation with one of the adjacent real pixels with a preset number; when the signal amplitude of the virtual pixel exceeds a set threshold value, marking the threshold crossing time of the virtual pixel as photon arrival time, taking a real pixel having a corresponding relation with the virtual pixel and a plurality of adjacent real pixels taking the real pixel having the corresponding relation as a center as pixels to be compared, and sending a request instruction to the pixels to be compared; respectively comparing the pixel to be compared with the adjacent real pixels according to the request instruction to obtain the real pixel with the maximum signal amplitude as the central pixel of the corresponding area; and comparing the central pixels of the plurality of regions to obtain a real pixel with the maximum signal amplitude as a central pixel, and taking the position of the central pixel as the arrival position of the photon.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A method of detector photon arrival information determination, the method comprising:
constructing a virtual pixel between any preset number of adjacent real pixels; the signals of the virtual pixels are superposed by signals of a preset number of adjacent real pixels;
and when the signal amplitude of the virtual pixel exceeds a set threshold, acquiring a real pixel with the maximum signal amplitude from the preset number of adjacent real pixels and the adjacent real pixels as a central pixel, and taking the position of the central pixel as a photon arrival position.
2. The method according to claim 1, wherein the virtual pixel has a correspondence with one of the preset number of adjacent real pixels;
when the signal amplitude of the virtual pixel exceeds a set threshold, acquiring a real pixel with the maximum signal amplitude from the preset number of adjacent real pixels and the real pixels adjacent to the preset number of adjacent real pixels as a central pixel, and taking the position of the central pixel as a photon arrival position, including:
when the signal amplitude of the virtual pixel exceeds a set threshold value, taking a real pixel having a corresponding relation with the virtual pixel and a plurality of adjacent real pixels taking the real pixel having the corresponding relation as a center as pixels to be compared, and sending a request instruction to the pixels to be compared;
respectively comparing the pixel to be compared with the real pixel adjacent to the pixel to be compared according to the request instruction to obtain the real pixel with the maximum signal amplitude as the central pixel of the corresponding area;
comparing the central pixels of the regions to obtain a real pixel with the maximum signal amplitude as a central pixel, and taking the position of the central pixel as the arrival position of the photon.
3. The method of claim 2, wherein the preset number is four; the virtual pixel has a corresponding relationship with a real pixel at a lower right position of the virtual pixel.
4. The method according to claim 3, wherein the regarding, as pixels to be compared, a real pixel having a correspondence relationship with the virtual pixel and a plurality of adjacent real pixels centered on the real pixel having a correspondence relationship, comprises:
and taking a real pixel having a corresponding relation with the virtual pixel and eight adjacent real pixels taking the real pixel having the corresponding relation as a center as a pixel to be compared.
5. The method according to any one of claims 3 to 4, wherein the comparing the pixel to be compared and the real pixel adjacent to the pixel to be compared according to the request instruction respectively comprises:
and comparing the pixel to be compared with the four real pixels on the pixel to be compared independently according to the request instruction.
6. The method of claim 1, further comprising:
marking the virtual pixel's time-to-threshold as a photon arrival time.
7. A detector photon arrival information determining apparatus, the apparatus comprising:
the virtual pixel construction module is used for constructing a virtual pixel between any preset number of adjacent real pixels; the signals of the virtual pixels are superposed by signals of a preset number of adjacent real pixels;
and the photon arrival position determining module is used for acquiring a real pixel with the maximum signal amplitude from the preset number of adjacent real pixels and the real pixels adjacent to the real pixels as a central pixel when the signal amplitude of the virtual pixel exceeds a set threshold, and taking the position of the central pixel as the photon arrival position.
8. A medical device comprising a memory and a processor, the memory storing a computer program, wherein the processor when executing the computer program performs the steps of the method of any one of claims 1 to 6.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 6.
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