CN113219510B - Nuclear radiation imaging collimator micropore positioning method and nuclear radiation imaging device - Google Patents
Nuclear radiation imaging collimator micropore positioning method and nuclear radiation imaging device Download PDFInfo
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Abstract
The invention provides a nuclear radiation imaging collimator micropore positioning method and a nuclear radiation imaging device, wherein a micropore array is arranged on a receiving surface of a collimator according to a preset interval, a radiation coverage view surface formed by projection of the imaging device under an ideal working distance is set, and a deflection angle of a central axis of any micropore relative to a central position point of the collimator is calculated according to projection of any micropore on the radiation coverage view surface, so that any micropore on the receiving surface of the collimator extends further towards the interior of the collimator according to respective inclination angles, and then the micropore array on the receiving surface of the collimator forms a corresponding pore array in the collimator, namely, each micropore on the receiving surface of the collimator corresponds to a unique specific area of a sensor surface through calculation of the deflection angle of each micropore, so that the response of the sensor to a radiation signal on the surface of the sensor is more accurate, and the beam receiving effect of the collimator to the radiation signal is remarkably improved.
Description
Technical Field
The invention relates to the technical field of nuclear radiation safety monitoring and nuclear radiation imaging, in particular to a nuclear radiation imaging collimator micropore positioning method and a nuclear radiation imaging device.
Background
Flaw detection and safety inspection by using nuclear radiation technology are mature common technical means in the prior art. However, the application of nuclear radiation technology is accompanied by certain safety problems, such as loss of the radiation source, or leakage of the radiation material, and even if the nuclear radiation equipment is not placed in a standard manner, irreversible damage is caused to a certain range of personnel. Accordingly, the prior art correspondingly provides a device for monitoring radiation conditions within a certain range.
A geiger counter is a common counting instrument in the prior art for detecting ionizing radiation, which senses nuclear radiation signals within a certain area from the counter and displays the approximate radiation signal intensity dose in the area by a numerical display. The common hand-held grid counter can move along with the detector in the radiation range, and can detect and display whether the detector has radiation in the range and the approximate size of the radiation in the moving process.
Although the cover counter solves the problems of identifying and assigning the radiation range to a certain extent, in some application scenarios, it is necessary to detect the nuclear radiation condition of a certain area in real time, and determine the specific position of the radiation source according to the nuclear radiation condition. Obviously, the cover counter cannot be applied to scenes with high real-time requirements.
In order to solve the technical problem, a more common solution in the prior art is to provide a radiation area imaging device, which configures a nuclear radiation sensor and an optical imaging device, in short, senses a radiation signal in a radiation area through the nuclear radiation sensor, and combines the radiation signal with an optical signal of the optical imaging device, so as to draw a visible radiation image in a current sensing area. The sharpness of the radiation image is affected by a number of factors, one of which is the beam-converging effect of the radiation signal received by the radiation sensor. One conceivable way to ensure the beam-converging effect of the radiation signal is to provide a signal collimating means in front of the signal receiving or sensing surface of the radiation sensor.
On the other hand, the data processing after the fusion of the radiation signal and the optical signal is performed. The essence of the radiation signal and optical signal data processing is the process of registering the collected radiation signal and optical signal, in which, on one hand, the radiation sensor is possibly affected by external incompletely filtered visible light and the like besides the induction radiation signal; on the other hand, if the multi-channel data superposition of the radiation signal and the optical signal is difficult to be accurate, an improved signal collimation device should be provided to solve the technical problems of poor beam-receiving effect of the radiation signal and the corresponding data processing of the radiation signal and the optical signal in the prior art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for positioning micropores of a nuclear radiation imaging collimator, which can improve the signal beam-converging effect of a nuclear radiation sensor, and a nuclear radiation imaging device for preparing the nuclear radiation imaging collimator by using the positioning method, so as to improve the definition of nuclear radiation imaging.
In order to solve the technical problems, the invention adopts a nuclear radiation imaging collimator micropore positioning method, which comprises the following steps: a step S1 of determining a coordinate system which takes a center position point O of a collimator as an origin and extends along a signal receiving surface of the collimator; step S2, determining the position of any micropore in the coordinate system according to a preset interval in the first direction and the second direction of the coordinate system; a step S3 of determining the width FOVw and the height FOVh of the collimator on the plane of view of the radiation coverage formed at its ideal working distance W; step S4 of determining a deflection angle of a central axis of any micropore on the collimator relative to a center position point O of the collimator according to the width FOVw and the height FOVh on the coverage view plane and the preset intervals of the micropores on the collimator in the first direction and the second direction; and step S5, sequentially obtaining the deflection angles of any micropores on the surface of the collimator, and enabling each micropore to further extend into the collimator according to the deflection angles of the micropores to form a plurality of long and thin channel type pores.
Preferably, in step S2, when determining the position of any micropore in the coordinate system, an m-row and n-column micropore array is formed on the signal receiving surface of the collimator according to the preset intervals in the first direction and the second direction.
Further preferably, in the step S3, the method further includes a process of determining a distance between the micro-hole array in the first direction and the second direction after the micro-hole array is projected on the coverage view surface, wherein the first distance δdx between adjacent micro-holes in the first direction after the micro-hole array on the collimator surface is projected on the coverage view surface is satisfied:
After the micropore array on the collimator surface is projected on the coverage view field surface, the projection array is in a second direction, and a second distance delta Dy between adjacent micropores meets the following conditions:
Still further preferably, the step of determining the skew angle of the center axis of any one of the micro-holes on the collimator with respect to the collimator center position point O according to the width FOVw and the height FOVh on the coverage view plane and the preset pitches of the micro-holes on the collimator in the first direction and the second direction includes: a step S41 of determining a third pitch δdx in the first direction and a fourth pitch δdy in the second direction of the array of micro holes of the collimator; a step S42 of acquiring a distance Z1 from any projection point on the projection array to a center position point of the radiation coverage field of view surface and a distance Z2 from any micropore in the micropore array to the center position point of the collimator according to the first pitch δdx, the second pitch δdy, and the third pitch δdx and the fourth pitch δdy of the micropore array of the projection array; and step S43, obtaining the deflection angle of the micropore central shaft relative to the collimator central position point O according to the distances Z1 and Z2.
Still further preferably, the step of determining a third pitch δdx of the array of micro-holes of the collimator in the first direction and a fourth pitch δdy in the second direction is: determining the length L and the width S of the signal receiving surface of the collimator and the distance E from the micropore to the signal receiving surface at the position of the upper edge of the signal receiving surface, wherein,
The length L satisfies the following conditions: l=2e+ (n-1) δd x;
the width S satisfies: s=2e+ (m-1) δd y.
Still further preferably, the step of obtaining the deflection angle of the center axis of the micropore with respect to the center position point O of the collimator according to the distances Z1 and Z2 comprises: the distance Z1 of any projection on the projection array to the central position point of the radiation coverage view surface is as follows:
the distance Z2 from any microwell on the microwell array to the central position point of the signal receiving surface of the collimator is as follows:
the skew angle θ of any micropore center axis relative to the collimator center position point O:
Correspondingly, the invention also provides a nuclear radiation imaging device, which comprises a nuclear radiation signal collimator for carrying out opening based on the nuclear radiation imaging collimator micropore positioning method, and the imaging device further comprises: the nuclear radiation sensor receives radiation signals in the area and converts the radiation signals into digital signals, an assembly surface of the nuclear radiation signal collimator is attached to a sensing surface of the nuclear radiation sensor, one surface of the nuclear radiation signal collimator, which is not attached to the sensing surface of the nuclear radiation sensor, is a receiving surface, and an optical filter is arranged on the receiving surface; the visible light optical image sensor receives visible light signals in a region and converts the visible light signals into digital signals, and the visible light optical image sensor further comprises a data processor, wherein the data processor processes the digital signals converted by the radiation sensor and the visible light optical image sensor.
Preferably, the data processor comprises: the positioning module responds to the digital signals converted by the nuclear radiation sensor and acquires the local position and the global position of the maximum point of the radiation intensity in the current receiving area; the interpolation processing module is used for carrying out interpolation processing on each digital signal and the resolution of the nuclear radiation sensor to form a signal distribution state diagram; and the registration module registers and superimposes the signal distribution state diagram and the optical imaging diagram shot by the visible light optical image sensor.
Further preferably, the registration module acquires a background signal of the radiation imaging and eliminates the background signal before registration.
Still further preferably, the nuclear radiation imaging device includes a carrier structure, and a plurality of visible light optical sensors and the nuclear radiation sensor carried by the carrier structure, where the nuclear radiation sensor and the visible light optical sensor are arranged in parallel or side by side.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial technical effects:
1. The invention is firstly proposed aiming at the technical problem of poor beam-converging effect of the nuclear radiation sensor in the prior art, and in the preferred embodiment of the invention, the micropore positioning of the nuclear radiation imaging collimator is improved. Firstly, arranging a micropore array on a receiving surface of a collimator according to a preset interval, setting a radiation coverage view surface formed by projection of an imaging device at an ideal working distance, and calculating a deflection angle of a central axis of any micropore relative to a central position point of the collimator according to projection of any micropore on the radiation coverage view surface, wherein any micropore on the receiving surface of the collimator extends further towards the interior of the collimator according to respective inclination angles, so that a slender channel type pore is formed, the micropore array on the receiving surface of the collimator forms a corresponding pore array in the interior of the collimator, namely, each micropore on the receiving surface of the collimator corresponds to a unique specific area of a sensor surface through calculation of the deflection angle of each micropore, so that the response of the sensor to a radiation signal on the surface of the sensor is more accurate, and the beam receiving effect of the collimator to the radiation signal is remarkably improved;
2. Another aspect of the present invention is to address the technical problem of insufficient resolution of radiation imaging in the prior art. Aiming at the problem, the invention provides the collimator prepared by the method, and the inclination angle of each micropore is calculated, so that after the collimator is used for beam convergence, the nuclear radiation sensor can accurately respond to a digital signal generated on the local surface of the collimator, and then according to the digital signal, the radiation signal in a specific area pointed by any micropore can be acquired, namely, the acquisition and positioning accuracy of the radiation signal is improved; then, when the radiation signal and the optical signal are fused, the resolution of the radiation signal distribution state diagram is improved through interpolation processing, and the definition of nuclear radiation imaging is effectively improved through a mode of firstly removing background signals and then registering and superposing.
Drawings
FIG. 1 is a schematic diagram illustrating a nuclear radiation imaging collimator made in accordance with a preferred embodiment of the present invention;
FIG. 2 is a cross-sectional view showing a cross-sectional configuration of the nuclear radiation imaging collimator shown in FIG. 1;
FIG. 3 is a flow chart illustrating the flow of a method for positioning micro-holes of a nuclear radiation imaging collimator according to a preferred embodiment of the present invention;
FIG. 4 is a schematic diagram showing the structure of assembling the nuclear radiation imaging collimator shown in FIG. 1 with a nuclear radiation sensor;
fig. 5 is a schematic view showing the structure of a nuclear radiation imaging apparatus according to the first embodiment of the present invention;
FIG. 6 is a schematic diagram showing a radiation signal distribution state diagram generated according to the radiation signal intensity in the operating state of the nuclear radiation imaging apparatus shown in FIG. 5;
fig. 7 is a schematic view showing the structure of a nuclear radiation imaging apparatus described in the second embodiment of the present invention.
Detailed Description
Embodiments of a method for positioning micropores of a collimator for nuclear radiation imaging and a device for nuclear radiation imaging according to the present invention will be described below with reference to the accompanying drawings. Those skilled in the art will recognize that the described embodiments may be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive in scope. Furthermore, in the present specification, the drawings are not drawn to scale, and like reference numerals denote like parts.
It should be noted that, in the embodiments of the present invention, the expressions "first" and "second" are used to distinguish two entities with the same name but different entities or different parameters, and it is noted that the expressions "first" and "second" are merely used for convenience of description, and should not be construed as limiting the embodiments of the present invention, and the following embodiments are not described one by one.
The preferred embodiment of the invention is provided for solving the technical problems in the two aspects of the nuclear radiation imaging technical field in the prior art:
1) The beam-converging effect of the collimator is poor, so that the response and positioning accuracy of the nuclear radiation sensor to local digital signals are difficult to ensure;
2) In the process of the radiation signal visualization, the fusion process of the radiation signal and the optical signal is single, so that the nuclear radiation imaging definition is insufficient and the signal to noise ratio is low.
The invention solves the technical problem of the first aspect of the prior art, and is an improvement on the micropore positioning mode of the alignment device. Fig. 1 is a schematic view showing a nuclear radiation imaging collimator prepared in a preferred embodiment of the present invention. According to the orientation illustrated in the drawings, a nuclear radiation imaging collimator 100 as shown in fig. 1 includes a bottom mounting face 101 and a receiving face 102 opposite the mounting face 101. The mounting surface 101 is a side surface to which the nuclear radiation sensor is mounted, and the receiving surface 102 is a side surface to which the radiation signal is received. A multi-row multi-column array of micro-holes 103 is formed in the receiving surface of the collimator 100.
In the preferred embodiment, the microwell array comprises 9 rows and 13 columns, i.e., to ensure accurate positioning of the center position O of the receiving surface 102 of the collimator 100, the microwell array is configured in odd rows and odd columns. However, the method for positioning micro-holes according to the present invention is also applicable to micro-hole arrays with non-odd rows and non-odd columns, and the preferred embodiment of the present invention should not be limited by the number of rows, the number of columns and the shape of micro-holes of the micro-hole array, and in the following description of this embodiment, an array of micro-holes including m rows and n columns is described as an example.
With continued reference to fig. 1, m rows correspond to the long sides of the receiving surface 102 of the collimator 100, n columns correspond to the short sides of the receiving surface of the collimator 100, i.e., m rows correspond to the length of the receiving surface 102 of the collimator 100, and n columns correspond to the width of the receiving surface 102 of the collimator 100, it being understood that in other embodiments of the invention, the correspondence between rows and columns and length and width may be adjusted according to the pattern of the receiving surface of the collimator.
Fig. 2 is a cross-sectional view showing a cross-sectional structure of the nuclear radiation imaging collimator shown in fig. 1. Referring to fig. 2, it can be seen that each microwell 103 in the array of microwells extends further from the receiving face 102 of the collimator 100 toward the mounting face 101 of the collimator 100 and forms a plurality of elongated channel-like apertures 104. The plurality of elongated channel-type apertures 104 form a converging aperture array, so that the technical purpose of the method for positioning micropores of a nuclear radiation imaging collimator according to the present invention includes:
1) Determining the location of each microwell on the microwell array;
2) The tilt angle at which each aperture on the array of apertures extends toward the collimator assembly face is determined.
Fig. 3 is a flow chart showing a flow of a method for positioning micropores of a nuclear radiation imaging collimator according to a preferred embodiment of the present invention. The method for positioning the micropores of the nuclear radiation imaging collimator according to the preferred embodiment of the present invention includes the following steps: a step S1 of determining a coordinate system extending along the signal receiving surface of the collimator with the center point O of the collimator as an origin; step S2, determining the position of any micropore in the coordinate system according to a preset interval in the first direction and the second direction of the coordinate system; a step S3 of determining the width FOVw and the height FOVh of the collimator over the plane of view of the radiation formed at its ideal working distance W; step S4 of determining the deflection angle of the central axis of any micropore on the collimator relative to the central position point O of the collimator according to the width FOVw and the height FOVh on the coverage view plane and the preset intervals of the micropores on the collimator in the first direction and the second direction; and step S5, sequentially acquiring the deflection angles of any micropores on the surface of the collimator, and enabling each micropore to further extend into the collimator according to the deflection angles of the micropores to form a plurality of long and thin channel type pores.
Specifically, the present invention relates to a method for manufacturing a semiconductor device. After the number of rows and columns of the micropore array on the collimator receiving surface is determined, a plane rectangular coordinate system which takes the central position point O of the collimator receiving surface as an origin and extends along the signal receiving surface of the collimator as a plane is constructed. The two directions of the coordinate system are defined as a first direction and a second direction, wherein the first direction is an extending direction with respect to a longitudinal direction of the signal receiving surface of the collimator, the second direction is an extending direction with respect to a width direction of the signal receiving surface of the collimator, and generally, the first direction may be defined as an X-axis direction of the coordinate system, and the second direction may be defined as a Y-axis direction of the coordinate system. In the array of m rows and n columns of micropores, n micropores in the m rows are distributed at equal intervals along the first direction according to a preset interval, and m micropores in the n columns are distributed at equal intervals along the second direction according to a preset interval. In different embodiments of the present invention, the preset pitches of the micro-hole arrays in the first direction and the second direction may be equal or different, and the pitches in the first direction and the second direction may be adjusted accordingly according to different collimator specifications, different materials, different rows and different columns of the micro-hole arrays.
In the concrete calculation, determining the length L and the width S of the signal receiving surface of the collimator and the distance E from the micropore at the most edge to the edge position of the signal receiving surface, the length L should be as follows: l=2e+ (n-1) δd x; the width S should satisfy: s=2e+ (m-1) δd y. Wherein δdx is the pitch of the micropores in the micropore array in the first direction, and δdy is the pitch of the micropores in the micropore array in the second direction. The positions of any micro-hole in the m rows and n columns of micro-hole arrays on the collimator signal receiving surface can be determined according to the pitches of the micro-hole arrays in the first direction and the second direction.
The ideal working distance of the nuclear radiation sensor is set to be W, that is, when the nuclear radiation sensor works, a projection plane is formed at the position of the distance W in the front direction, and the projection plane is defined as a radiation coverage view plane, so in the preferred embodiment of the present invention, the width FOVw and the height FOVh of the radiation coverage view plane are also required to be measured, and the distance between each projection in the first direction and the second direction in the projection array of the micropore array on the radiation coverage view plane is determined according to the width FOVw and the height FOVh. Based on the width FOVw of the page when covered by radiation, it should be that the pitch δdx of the projected array in the first direction satisfiesWhile the spacing δdy of the projected array in the second direction satisfies/>
Then, the distance Z1 from any projection micropore on the projection array to the center position of the radiation coverage view surface and the distance Z2 from any micropore (i, j) on the collimator signal receiving surface to the collimator center position point O can be determined by Pythagorean theorem. That is, the distance Z1 should satisfy:
The distance Z2 should satisfy:
The tilt angle of the central axis of any microwell on the microwell array with respect to the collimator signal receiving surface central position point O can be expressed as:
substituting the values of Z1 and Z2 into the formula of the inclination angle respectively, namely:
thereby deriving the skew angle of the central axis of any one microwell relative to the collimator central position O.
For each aperture on the collimator, the angle at which it extends to the mounting face of the collimator is determined in accordance with the aperture positioning method described above, such that each aperture extends at its oblique angle to form an array of elongate channel apertures in the collimator as shown in figure 2. Fig. 4 is a schematic view showing a structure of assembling the nuclear radiation imaging collimator shown in fig. 1 with the nuclear radiation sensor, and referring to fig. 1 and 4, assembling face 101 of collimator 100 with nuclear radiation sensor 200 is assembled. In actual use, the signal receiving surface 102 of the collimator 100 is covered with a photosensitive film or a filter.
Example 1
In a first embodiment of the present invention, a nuclear radiation imaging apparatus is provided, fig. 5 is a schematic diagram showing a structure of the nuclear radiation imaging apparatus according to the first embodiment of the present invention, and referring to fig. 5, the nuclear radiation imaging apparatus according to the first embodiment includes a nuclear radiation sensor 200 equipped with a nuclear radiation collimator 100, a visible light optical image sensor 300, and the nuclear radiation sensor 200 and the visible light optical image sensor 300 are supported and fixed by a bearing support structure 400. The nuclear radiation imaging device is in communication with an external processor, the external processor is a terminal for executing a data processing process, and the terminal can be a personal computer, a server or mobile communication equipment, and the embodiment is not limited by the type of the external processor.
The nuclear radiation sensor mentioned in this embodiment is a silicon-based semiconductor sensor of the area array CMOS type. The nuclear radiation collimator mentioned in this embodiment is a collimator made of heavy metal element material, for example, copper metal or lead-based alloy, which is prepared by the above-mentioned micropore positioning method and can shield and attenuate radiation signals, and has an array of pores therein as shown in fig. 2. The collimator is configured in a three-dimensional ladder shape, so that in an operating state, before the nuclear radiation sensor 200 receives a radiation signal in the area, the nuclear radiation collimator 100 at the front end thereof receives the received radiation signal and performs beam-converging collimation. The nuclear radiation sensor 200 converts the received radiation signal into a digital signal and sends the digital signal to an external processor.
Similarly, the visible light optical image sensor 300 senses and receives the visible light signal in the area, converts the visible light signal into a digital signal, and sends the digital signal to an external processor for data processing.
Each of the micro-holes in collimator 100, and its corresponding aperture, corresponds to a unique specific area on the sensing surface of nuclear radiation sensor 200. In actual detection, the radiation signal in the area passes through a certain micropore and reaches a specific area corresponding to the micropore on the sensing surface of the nuclear radiation sensor 200. The nuclear radiation sensor 200 responds to the radiation signal and generates a digital signal corresponding to the local area, which is then sent to an external processor.
The external processor analyzes the digital signal sent by the nuclear radiation sensor 200, and can obtain the radiation signal intensity within the area range pointed by the micropore, and after the radiation signal in each micropore is analyzed, the radiation signal distribution in the whole area corresponding to the working distance of the nuclear radiation sensor, and the position of the maximum zone of the radiation intensity within the area range can be obtained, and the micropore pore positioning is completed according to the position.
Fig. 6 is a schematic diagram showing a radiation signal distribution state diagram generated according to the radiation signal intensity in the operating state of the nuclear radiation imaging apparatus shown in fig. 5, and after the positioning of the aperture is completed, interpolation processing is performed according to the number of rows and columns of the micro-aperture array. For example, in this embodiment, taking an example of a micro-hole array of 13 rows and 9 columns, setting the interpolation coefficient to 100, a radiation signal distribution state diagram with a resolution of 1300×900 as shown in fig. 6 is generated, and the brightest point position in fig. 6 points to the position with the maximum radiation intensity in the detection area.
Since the nuclear radiation sensor may be affected by visible light whose external portion is not filtered by the filter, in addition to high-energy particles such as an induced radiation signal. Therefore, in the data processing process of the preferred embodiment of the invention, the background signal is removed from the generated radiation signal distribution state diagram according to the pre-acquired background signal of the radiation imaging, and then the radiation state diagram and the optical imaging diagram are registered and overlapped in a channel.
In the first embodiment of the present invention, after the two-bit color image data is fused with the radiation signal distribution state diagram, the channels of the image data are four channels of data, including RGB color channels, and a data channel L of the radiation distribution intensity at the corresponding spatial position of each pixel pair.
Example two
Fig. 7 is a schematic view showing the structure of a nuclear radiation imaging apparatus described in the second embodiment of the present invention. Referring to fig. 6, the embodiment is different from the embodiment one in the following manner:
1) The nuclear radiation imaging apparatus of the second embodiment includes two visible light optical image sensors 300;
2) In the first embodiment, the visible light optical image sensor and the nuclear radiation sensor are arranged in parallel, in other words, the projection position of the visible light optical image sensor in the horizontal direction coincides with the projection position of the nuclear radiation sensor in the horizontal direction. In the second embodiment, the height positions of the two visible light optical image sensors 300 in the vertical direction are the same as the height positions of the nuclear radiation sensor 200 in the vertical direction, in other words, the two visible light optical image sensors 300 are arranged side by side with the nuclear radiation sensor 200 and distributed on both sides of the nuclear radiation sensor 200;
By the arrangement as described above, the arrangement method in the second embodiment can maintain the coincidence of the two visible light optical image sensors and the optimum field area facing the nuclear radiation sensor. The two optical imaging devices form a binocular depth imaging system. The specific signal receiving and data signal processing method is similar to that of the first embodiment, and referring to the corresponding part in the first embodiment, the number of image data channels in the second embodiment is five-channel data, and besides the RGB color channels and the radiation distribution intensity channel L similar to those in the first embodiment, the method further includes a depth data channel D due to the adoption of the binocular depth imaging system.
The rest of the same parts of the two embodiments will not be described again, and reference will be made to the corresponding parts in the first embodiment.
The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A method for locating micropores of a nuclear radiation imaging collimator, the method comprising the steps of:
A step S1 of determining a coordinate system which takes a center position point O of a collimator as an origin and extends along a signal receiving surface of the collimator;
step S2, determining the position of any micropore in the coordinate system according to a preset interval in the first direction and the second direction of the coordinate system;
a step S3 of determining the width FOVw and the height FOVh of the collimator on the plane of view of the radiation coverage formed at its ideal working distance W;
step S4 of determining a deflection angle of a central axis of any micropore on the collimator relative to a center position point O of the collimator according to the width FOVw and the height FOVh on the coverage view plane and the preset intervals of the micropores on the collimator in the first direction and the second direction;
And step S5, sequentially acquiring the deflection angle of each micropore on the surface of the collimator, and enabling each micropore to further extend into the collimator according to the deflection angle of each micropore to form a plurality of long and thin channel type pores.
2. The method according to claim 1, wherein in step S2, when determining the position of any one of the micro-holes in the coordinate system, an m-row and n-column array of micro-holes is formed on the signal receiving surface of the collimator according to the preset pitches in the first direction and the second direction.
3. The method of positioning micropores in a nuclear radiation imaging collimator according to claim 2, further comprising a process of determining a pitch of projection holes of the micropore array in a first direction and a second direction after the projection of the micropore array on the coverage field of view surface in step S3, wherein,
After the micropore array on the surface of the collimator is projected on the coverage view field surface, the projection array is in a first direction, and a first interval delta Dx between adjacent micropores is as follows:
After the micropore array on the collimator surface is projected on the coverage view field surface, the projection array is in a second direction, and a second distance delta Dy between adjacent micropores meets the following conditions:
4. a method of positioning micropores in a nuclear radiation imaging collimator according to claim 3, wherein the step of determining the skew angle of the central axis of any one of the micropores in the collimator with respect to the collimator center position point O according to the width FOVw and the height FOVh on the coverage field of view and the preset pitches of the micropores in the collimator in the first direction and the second direction includes:
A step S41 of determining a third pitch δdx in the first direction and a fourth pitch δdy in the second direction of the array of micro holes of the collimator;
A step S42 of acquiring a distance Z1 from any projection point on the projection array to a center position point of the radiation coverage field of view surface and a distance Z2 from any micropore in the micropore array to the center position point of the collimator according to the first pitch δdx, the second pitch δdy, and the third pitch δdx and the fourth pitch δdy of the micropore array of the projection array;
and step S43, obtaining the deflection angle of the micropore central shaft relative to the collimator central position point O according to the distances Z1 and Z2.
5. The method of positioning micropores of a nuclear radiation imaging collimator according to claim 4, wherein the step of determining a third pitch δdx in the first direction and a fourth pitch δdy in the second direction of the micropore array of the collimator is:
Determining the length L and the width S of the signal receiving surface of the collimator and the distance E from the micropore to the signal receiving surface at the position of the upper edge of the signal receiving surface, wherein,
The length L satisfies the following conditions: l=2e+ (n-1) δd x;
the width S satisfies: s=2e+ (m-1) δd y.
6. The method for positioning micropores of a nuclear radiation imaging collimator according to claim 5, wherein the step of acquiring the tilt angle of the micropore central axis with respect to the collimator central position point O according to the distances Z1 and Z2 is as follows:
The distance Z1 of any projection on the projection array to the central position point of the radiation coverage view surface is as follows:
the distance Z2 from any microwell on the microwell array to the central position point of the signal receiving surface of the collimator is as follows:
the skew angle θ of any micropore center axis relative to the collimator center position point O:
7. A nuclear radiation imaging apparatus comprising a nuclear radiation signal collimator perforated based on the nuclear radiation imaging collimator micropore location method of any of claims 1 to 6, the imaging apparatus further comprising:
the nuclear radiation sensor receives radiation signals in the area and converts the radiation signals into digital signals, an assembly surface of the nuclear radiation signal collimator is attached to a sensing surface of the nuclear radiation sensor, one surface of the nuclear radiation signal collimator, which is not attached to the sensing surface of the nuclear radiation sensor, is a receiving surface, and an optical filter is arranged on the receiving surface;
At least one visible light optical image sensor that receives a visible light signal in a region and converts the visible light signal into a digital signal, wherein,
And the device also comprises a data processor, wherein the data processor processes digital signals converted by the radiation sensor and the visible light optical image sensor.
8. The nuclear radiation imaging apparatus of claim 7 wherein the data processor comprises:
The positioning module responds to the digital signals converted by the nuclear radiation sensor and acquires the local position and the global position of the maximum point of the radiation intensity in the current receiving area;
The interpolation processing module is used for carrying out interpolation processing on each digital signal and the resolution of the nuclear radiation sensor to form a signal distribution state diagram;
and the registration module registers and superimposes the signal distribution state diagram and the optical imaging diagram shot by the visible light optical image sensor.
9. The nuclear radiation imaging apparatus of claim 8, wherein the registration module obtains a background signal of the radiation imaging and cancels the background signal prior to registration.
10. The nuclear radiation imaging apparatus of claim 9, wherein the nuclear radiation imaging apparatus comprises a carrier structure, and a plurality of visible light optical sensors and the nuclear radiation sensors carried by the carrier structure, wherein,
The nuclear radiation sensor and the visible light optical sensor are arranged in parallel or side by side.
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Denomination of invention: A method for locating micro holes in a nuclear radiation imaging collimator and a nuclear radiation imaging device Granted publication date: 20240531 Pledgee: Bank of Nanjing Limited by Share Ltd. Suzhou branch Pledgor: BLUEJAY IMAGING Co.,Ltd. Registration number: Y2024980031514 |