CN113219510A - 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 field of view formed by projection of an 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 field of view, so that any micropore on the receiving surface of the collimator further extends towards the inside of the collimator according to respective deflection angle, 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 on the surface of a sensor through calculation of the deflection angle of each micropore, thereby enabling the response of the sensor to a surface radiation signal of the collimator to be more accurate, the beam-converging effect of the collimator on the radiation signals is obviously 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
The nuclear radiation technology is used for flaw detection and safety inspection, and becomes a 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 radiation source, or leakage of radiation material, and even non-standardized placement of nuclear radiation equipment can cause irreversible damage to personnel within a certain range. Therefore, the prior art correspondingly provides a device for monitoring the radiation condition within a certain range.
A geiger counter is a counting instrument for detecting ionizing radiation, which is a common instrument in the prior art, and is capable of sensing nuclear radiation signals within a certain range from a certain region of the geiger counter and displaying the approximate radiation signal intensity dose in the region through a numerical display. The common hand-held Geiger counter can move along with the detection personnel in the radiation range, and detects and displays whether radiation exists in the range of the detection personnel and the approximate size of the radiation in the moving process.
Although the problem of radiation range identification and assignment is solved to a certain extent by the Geiger counter, in some application scenarios, the nuclear radiation condition of a certain area needs to be detected in real time, and the specific position of the radiation source is determined according to the nuclear radiation condition. Obviously, the geiger counter cannot be applied to scenes with high real-time requirements.
In order to solve the technical problem, a common scheme in the prior art is to provide a radiation area imaging device, where a nuclear radiation sensor and an optical imaging device are configured, in short, a radiation signal in a radiation area is sensed by the nuclear radiation sensor, and the radiation signal is combined with an optical signal of the optical imaging device, so as to draw a visible radiation image in the current sensing area. The sharpness of the radiation image is influenced by various factors, such as the beam-closing effect of the radiation sensor receiving the radiation signal. In a conceivable way of ensuring the effect of the radiation signal beam-off, a signal collimating device is arranged upstream of the signal receiving or sensing surface of the radiation sensor.
On the other hand, the influence on the radiation imaging definition is data processing after the radiation signal and the optical signal are fused. The essence of data processing of the radiation signal and the optical signal is a process of registering the collected radiation signal and the optical signal, and in the process, on one hand, the radiation sensor can sense the radiation signal and can be influenced by visible light and the like which is not completely filtered outside; on the other hand, the multi-channel data superposition of the radiation signal and the optical signal is difficult to be accurate, and therefore, an improved signal collimating device should be provided to solve the technical problems of poor beam-converging effect of the radiation signal and 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 nuclear radiation imaging collimator micropore positioning method capable of improving the signal beam-receiving effect of a nuclear radiation sensor, and a nuclear radiation imaging device which uses the positioning method to prepare the nuclear radiation imaging collimator so as to improve the nuclear radiation imaging definition.
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 extending along the signal receiving surface of the collimator with the central position point O of the collimator as an origin; step S2, determining the position of any micropore in the coordinate system according to the preset distance in the first direction and the second direction of the coordinate system; a step S3 of determining a width FOVw and a height FOVh of a radiation coverage field of view formed by the collimator at its ideal working distance W; a step S4 of determining a skew angle of a central axis of any of the micro-holes on the collimator with respect to a collimator central position point O, based on the width FOVw and the height FOVh on the field-of-view-covered surface and the preset pitches of the micro-holes on the collimator in the first and second directions; and step S5, sequentially obtaining the deflection angle of any micro-hole on the surface of the collimator, and further extending each micro-hole into the collimator according to the deflection angle to form a plurality of elongated channel-type pores.
Preferably, in step S2, when the position of any micro-hole in the coordinate system is determined, an array of micro-holes in m rows and n columns 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 step S3, the method further includes a process of determining a distance between the micro-hole arrays projected on the covered field of view surface in a first direction and a second direction, wherein the micro-hole arrays projected on the collimator surface are projected on the covered field of view surface with their projected arrays in the first direction, and the first distance δ Dx between adjacent micro-holes satisfies:
after the micropore array on the surface of the collimator is projected on a view field covering surface, the projection array is in a second direction, and a second distance δ Dy between adjacent micropores meets the following requirements:
still further preferably, the step of determining the deviation angle of the central axis of any micro-hole on the collimator with respect to the collimator central position point O according to the width FOVw and the height FOVh on the covered field of view surface and the preset distances of the micro-holes on the collimator in the first direction and the second direction comprises: a step S41 of determining a third pitch δ dx of the micro-hole array of the collimator in the first direction, and a fourth pitch δ dy in the second direction; a step S42 of obtaining a distance Z1 from any projection point on the projection array to a central position point of the radiation covered field of view and a distance Z2 from any micro-hole in the micro-hole array to the central position point of the collimator, according to the first pitch δ Dx, the second pitch δ Dy, and the third pitch δ Dx and the fourth pitch δ Dy of the micro-hole array; and a step S43 of obtaining a deflection angle of the central axis of the micro-hole with respect to the central position point O of the collimator from the distances Z1 and Z2.
Still further preferably, the step of determining a third pitch δ dx of the micro-hole array of the collimator in the first direction and a fourth pitch δ dy in the second direction is: determining the length L and width S of the signal receiving surface of the collimator, and the distance E from a micropore to the signal receiving surface at an edge location on the signal receiving surface,
the length L satisfies: l ═ 2E + (n-1) δ dx；
The width S satisfies: S2E + (m-1) δ dy。
Still further preferably, the step of obtaining the deflection angle of the central axis of the micro-hole with respect to the central position point O of the collimator from the distances Z1 and Z2 is: the distance Z1 of any central position point projected to the radiation coverage field of view on the projection array satisfies:
the distance Z2 from any micropore in the micropore array to the central position point of the signal receiving surface of the collimator satisfies the following conditions:
the deflection angle theta of the central axis of any micro-hole with respect to the central position point O of the collimator is as follows:
correspondingly, the invention also provides a nuclear radiation imaging device, which comprises a nuclear radiation signal collimator for opening holes based on the nuclear radiation imaging collimator micropore positioning method, and the imaging device further comprises: the nuclear radiation sensor is used for receiving radiation signals in an area and converting the radiation signals into digital signals, the assembling surface of the nuclear radiation signal collimator is attached to the sensing surface of the nuclear radiation sensor, the surface, which is not attached to the sensing surface of the nuclear radiation sensor, of the nuclear radiation signal collimator is a receiving surface, and an optical filter is arranged on the receiving surface; the visible light optical image sensor receives a visible light signal in an area and converts the visible light signal into a digital signal, and the visible light optical image sensor further comprises a data processor which processes the digital signal converted by the radiation sensor and the visible light optical image sensor.
Preferably, the data processor comprises: the positioning module responds to the digital signal converted by the nuclear radiation sensor and acquires the local position and the global position of the point with the maximum radiation intensity in the current receiving area; the interpolation processing module is used for performing 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 superposes the signal distribution state diagram and an optical imaging diagram shot by the visible light optical image sensor.
Further preferably, the registration module acquires a background signal of radiation imaging and eliminates the background signal before registration.
Still further preferably, the nuclear radiation imaging apparatus includes a carrier structure, and a plurality of visible light optical sensors and the nuclear radiation sensor are carried by the carrier structure, wherein the nuclear radiation sensor and the visible light optical sensors are arranged in parallel or side by side.
Compared with the prior art, the invention has the following beneficial technical effects due to the adoption of the technical scheme:
1. the invention is provided for 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, according to a preset distance, a micropore array is arranged on a receiving surface of a collimator, then a radiation covering field of view formed by projection of an imaging device under an ideal working distance is set, according to projection of any micropore on the radiation covering field of view, a deflection angle of a central axis of any micropore relative to a central position point of the collimator is calculated, in this way, any micropore on the receiving surface of the collimator further extends towards the inside of the collimator according to respective inclination angle, so that a slender channel type pore is formed, 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 on the surface of a sensor through calculation of the deflection angle of each micropore, so that the response of the sensor to a surface radiation signal of the collimator is more accurate, the beam-converging effect of the collimator on radiation signals is obviously improved;
2. the invention also aims at the technical problem of insufficient radiation imaging definition 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 receives the radiation, the nuclear radiation sensor can accurately respond to a digital signal generated on the local surface of the nuclear radiation sensor, and then the radiation signal in a specific area pointed by any micropore can be obtained according to the digital signal, namely, the radiation signal obtaining and positioning accuracy is improved; and then, when the radiation signal and the optical signal are fused, the resolution of a radiation signal distribution state diagram is improved through interpolation processing, and the definition of nuclear radiation imaging is effectively improved through a mode of removing a background signal and then registering and superposing.
Drawings
FIG. 1 is a schematic diagram illustrating a nuclear radiation imaging collimator made in a preferred embodiment of the present invention;
FIG. 2 is a sectional view showing a sectional configuration of the nuclear radiation imaging collimator of FIG. 1;
FIG. 3 is a flow chart illustrating a process of a nuclear radiation imaging collimator micro-hole positioning method according to a preferred embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a configuration of assembling the nuclear radiation imaging collimator of FIG. 1 with a nuclear radiation sensor;
fig. 5 is a schematic diagram showing a configuration of a nuclear radiation imaging apparatus according to a first embodiment of the present invention;
FIG. 6 is a diagram illustrating a distribution of radiation signals generated according to intensity of the radiation signals in an operating state of the nuclear radiation imaging apparatus shown in FIG. 5;
fig. 7 is a schematic diagram showing a configuration of a nuclear radiation imaging apparatus described in the second embodiment of the present invention.
Detailed Description
Embodiments of a nuclear radiation imaging collimator micropore positioning method and a nuclear radiation imaging device according to the present invention will be described below with reference to the accompanying drawings. Those of ordinary skill in the art will recognize that the described embodiments can be modified in various different ways, without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Furthermore, in the present description, the drawings are not to scale and like reference numerals refer to 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 names or different parameters, and it is understood that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and the descriptions thereof in the following embodiments are omitted.
The preferred embodiment of the present invention is proposed to solve the following two technical problems in the technical field of nuclear radiation imaging in the prior art:
1) the collimator has poor beam-converging effect, 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 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 idea of the invention to solve the technical problem of the first aspect of the prior art is to improve the positioning mode of the micropores of the aligner. FIG. 1 is a schematic diagram illustrating a nuclear radiation imaging collimator made in a preferred embodiment of the present invention. In the orientation illustrated in the drawings, the nuclear radiation imaging collimator 100 shown in fig. 1 includes a mounting face 101 at the bottom, and a receiving face 102 opposite the mounting face 101. The mounting surface 101 is a surface on which the nuclear radiation sensor is mounted, and the receiving surface 102 is a surface on which a radiation signal is received. On the receiving surface of the collimator 100, an array of a plurality of rows and a plurality of columns of micro-holes 103 is formed.
In the preferred embodiment, the array of microwells comprises 9 rows and 13 columns, i.e., to ensure accurate positioning of the central position O of the receiving face 102 of the collimator 100, the embodiment configures the array of microwells in odd rows and odd columns. However, the method for positioning the micro-wells according to the present invention is also applicable to the micro-well 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 and columns and the shape of the micro-wells, so that the embodiment will be described by taking the micro-well array with m rows and n columns 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 and 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 the rows and the lengths and widths may also be adjusted according to the type of the receiving surface of the collimator.
Fig. 2 is a sectional view showing a sectional structure of the nuclear radiation imaging collimator shown in fig. 1. Referring to fig. 2, it can be seen that each micro-hole 103 in the micro-hole array extends from the receiving surface 102 of the collimator 100 further towards the mounting surface 101 of the collimator 100 and forms a plurality of elongated channel-like apertures 104. The plurality of elongated channel-like apertures 104 form a converging aperture array, and thus the technical object of the method for positioning the micro-holes of the collimator for nuclear radiation imaging according to the present invention includes:
1) determining the position of each micropore on the micropore array;
2) and determining the inclination angle of each micropore on the micropore array extending towards the collimator assembling surface to form an aperture.
Fig. 3 is a flow chart illustrating a procedure of a nuclear radiation imaging collimator micropore positioning method according to a preferred embodiment of the present invention. The method for positioning the micro-holes of the nuclear radiation imaging collimator according to the preferred embodiment of the present invention comprises the following steps: a step S1 of determining a coordinate system extending along the signal receiving surface of the collimator with the central position point O of the collimator as the origin; step S2, determining the position of any micropore in the coordinate system according to the preset distance in the first direction and the second direction of the coordinate system; a step S3 of determining a width FOVw and a height FOVh of a radiation coverage field formed by the collimator at its ideal working distance W; a step S4 of determining a skew angle of a central axis of any of the microholes on the collimator with respect to a collimator central position point O, based on the width FOVw and the height FOVh on the view-covering surface and the preset pitches of the microholes on the collimator in the first direction and the second direction; and step S5, sequentially obtaining the deflection angle of any micro-hole on the surface of the collimator, and further extending each micro-hole into the collimator according to the deflection angle to form a plurality of elongated channel-type pores.
Specifically. And after the number of rows and columns of the micropore array on the collimator receiving surface is determined, constructing 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. The two directions of the coordinate system are defined as a first direction and a second direction, the first direction is an extending direction of a length direction of the signal receiving surface of the collimator, and the second direction is an extending direction of a width direction of the signal receiving surface of the collimator. In the micropore array of m rows and n columns, n micropores on m rows are distributed at equal intervals along a first direction according to a preset interval, and m micropores on n columns are distributed at equal intervals along a 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 also be adjusted accordingly according to the different specifications and materials of the collimator and the different numbers of rows and columns of the micro-hole arrays.
In specific calculation, the length L and the width S of the signal receiving surface of the collimator, and the distance E from the edge of the signal receiving surface to the edge of the micro-hole at the edge are determined, so that the length L should satisfy: l ═ 2E + (n-1) δ dx(ii) a The width S should satisfy: S2E + (m-1) δ dy. Where δ dx is the pitch of the microwells in the microwell array in the first direction, and δ dy is the pitch of the microwells in the microwell array in the second direction. The position of any micro-hole in the micro-hole array of m rows and n columns on the signal receiving surface of the collimator can be determined according to the spacing of the micro-hole array in the first direction and the second direction.
The ideal working distance of the nuclear radiation sensor is set as W, that is, when the nuclear radiation sensor works, a projection plane is formed at a position distant from W in the front direction, and the projection plane is defined as a radiation covered view field plane, in a preferred embodiment of the present invention, it is further required to measure the width FOVw and the height FOVh of the radiation covered view field plane, and determine the distance between each projection of the projection array of the micro-hole array on the radiation covered view field plane in the first direction and the second direction according to the width FOVw and the height FOVh. Based on the width of the page in radiation coverage FOVw, it should be observed that the pitch δ Dx of the projection array in the first direction satisfies
And the space delta Dy of the projection array in the second direction satisfies
Then, the distance Z1 from any projected pinhole in the projection array to the center position of the radiation covered field of view plane and the distance Z2 from any pinhole (i, j) in the collimator signal receiving plane to the collimator center position point O can be determined by the pythagorean theorem. That is, the distance Z1 should satisfy:
the distance Z2 should satisfy:
the inclination angle of the central axis of any micro-hole on the micro-hole array relative to the central position point O of the collimator signal receiving surface can be expressed as:
the values of Z1 and Z2 are respectively substituted into the formula for the tilt angle, i.e.:
thereby obtaining the deflection angle of the central axis of any micropore relative to the central position O of the collimator.
For each micro-hole on the collimator, the angle of the micro-hole extending towards the assembling surface of the collimator is determined according to the micro-hole positioning method, so that each micro-hole extends according to the inclined angle of the micro-hole to form the elongated channel type aperture array on the collimator as shown in fig. 2. Fig. 4 is a schematic diagram illustrating a structure of assembling the nuclear radiation imaging collimator shown in fig. 1 with a nuclear radiation sensor, and referring to fig. 1 and 4, the assembling face 101 of the collimator 100 is assembled with the nuclear radiation sensor 200 in a connecting manner. In actual use, a photosensitive film or a filter is covered on the signal receiving surface 102 of the collimator 100.
Example one
In a first embodiment of the present invention, a nuclear radiation imaging device is provided, fig. 5 is a schematic diagram illustrating a structure of the nuclear radiation imaging device according to the first embodiment of the present invention, and referring to fig. 5, the nuclear radiation imaging device 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 supporting structure 400. The nuclear radiation imaging device is further communicated with an external processor, the external processor is a terminal for executing data processing procedures, the terminal can be a personal computer, a server or a mobile communication device, 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 material, such as copper metal or lead-based alloy, which is made by the aforementioned micro-hole positioning method and can shield and attenuate radiation signals, and has an array of holes therein as shown in fig. 2. The collimator is in a three-dimensional ladder-shaped configuration, so that in a working state, before the nuclear radiation sensor 200 receives the radiation signals in the region, the nuclear radiation collimator 100 at the front end performs beam-receiving collimation on the received radiation signals. 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 region, and also converts the visible light signal into a digital signal and sends the digital signal to an external processor for data processing.
Each micro-hole in the collimator 100, and its corresponding aperture, corresponds to a unique specific area on the sensing surface of the nuclear radiation sensor 200. During actual detection, the radiation signal in the region passes through a certain micropore and reaches a specific region 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, and then sends the digital signal to the external processor.
The external processor analyzes the digital signal sent by the nuclear radiation sensor 200, and can obtain the radiation signal intensity in the area range to which the micropore points, 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 radiation intensity in the area range can be obtained, and micropore pore positioning is completed according to the position.
Fig. 6 is a schematic diagram illustrating 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 pores is completed, interpolation processing is performed according to the number of rows and columns of the micro-pore array. For example, in this embodiment, taking the micro-pore array of 13 rows and 9 columns as an example, 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 position of the brightest point in fig. 6 is the position of the maximum radiation intensity in the detection area.
The nuclear radiation sensor may be affected by visible light, which is not filtered by the filter, in an external portion, in addition to high-energy particles such as a sensing radiation signal. Therefore, in the data processing process of the preferred embodiment of the present invention, the background signal is removed from the generated radiation signal distribution state diagram according to the pre-acquired radiation imaging background signal, and then the radiation state distribution diagram and the optical imaging diagram are registered and channel superposed.
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-channel data, including RGB color channels, and a data channel L of radiation distribution intensity at a corresponding spatial position of each pixel pair.
Example two
Fig. 7 is a schematic diagram showing a configuration of a nuclear radiation imaging apparatus described in the second embodiment of the present invention. Referring to fig. 6, the two embodiments have the following differences compared to the first embodiment:
1) the nuclear radiation imaging apparatus according to 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 and the nuclear radiation sensor 200 are arranged side by side and distributed on two sides of the nuclear radiation sensor 200;
with the above arrangement, the arrangement method in the second embodiment can keep the two visible light optical image sensors and the nuclear radiation sensor in the same alignment with the optimal viewing area. 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 parts in the first embodiment, the number of image data channels in the second embodiment is five-channel data, and besides the RGB color channel and the radiation distribution intensity channel L which are similar to those in the first embodiment, the image data channel also includes a depth data channel D due to the adoption of a binocular depth imaging system.
The remaining parts that are the same in the two embodiments are not described again, and refer to the corresponding parts in the first embodiment.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A nuclear radiation imaging collimator micropore positioning method is characterized by comprising the following steps:
a step S1 of determining a coordinate system extending along the signal receiving surface of the collimator with the central position point O of the collimator as an origin;
step S2, determining the position of any micropore in the coordinate system according to the preset distance in the first direction and the second direction of the coordinate system;
a step S3 of determining a width FOVw and a height FOVh of a radiation coverage field of view formed by the collimator at its ideal working distance W;
a step S4 of determining a skew angle of a central axis of any of the micro-holes on the collimator with respect to a collimator central position point O, based on the width FOVw and the height FOVh on the field-of-view-covered surface and the preset pitches of the micro-holes on the collimator in the first and second directions;
and step S5, sequentially obtaining the deflection angle of each micro-hole on the surface of the collimator, and further extending each micro-hole into the collimator according to the deflection angle to form a plurality of elongated channel-type pores.
2. The method for positioning micro-holes of a collimator for nuclear radiation imaging according to claim 1, wherein in step S2, when the position of any micro-hole in the coordinate system is determined, an array of micro-holes in m rows and n columns is formed on the signal receiving surface of the collimator according to the preset distance in the first direction and the second direction.
3. The nuclear radiation imaging collimator micropore positioning method according to claim 2, further comprising a process of determining a pitch of projected holes of the micropore array in a first direction and a second direction after the micropore array is projected on the coverage field surface in step S3, wherein,
after the micropore array on the surface of the collimator is projected on a view coverage surface, the projection array is arranged in a first direction, and a first distance delta Dx between adjacent micropores meets the following conditions:
after the micropore array on the surface of the collimator is projected on a view field covering surface, the projection array is in a second direction, and a second distance δ Dy between adjacent micropores meets the following requirements:
4. the method of claim 3, wherein the step of determining the deviation angle of the central axis of any 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 field plane and the preset spacing of the micro-holes on the collimator in the first direction and the second direction comprises:
a step S41 of determining a third pitch δ dx of the micro-hole array of the collimator in the first direction, and a fourth pitch δ dy in the second direction;
a step S42 of obtaining a distance Z1 from any projection point on the projection array to a central position point of the radiation covered field of view and a distance Z2 from any micro-hole in the micro-hole array to the central position point of the collimator, according to the first pitch δ Dx, the second pitch δ Dy, and the third pitch δ Dx and the fourth pitch δ Dy of the micro-hole array;
and a step S43 of obtaining a deflection angle of the central axis of the micro-hole with respect to the central position point O of the collimator from the distances Z1 and Z2.
5. The method of claim 4, wherein the step of determining a third distance δ dx in the first direction and a fourth distance δ dy in the second direction of the micro-hole array of the collimator is:
determining the length L and width S of the signal receiving surface of the collimator, and the distance E from a micropore to the signal receiving surface at an edge location on the signal receiving surface,
the length L satisfies: l ═ 2E + (n-1) δ dx；
The width S satisfies: S2E + (m-1) δ dy。
6. The nuclear radiation imaging collimator micropore positioning method as claimed in claim 5, wherein the step of obtaining the deflection angle of the micropore central axis relative to the collimator central position point O according to the distances Z1 and Z2 is:
the distance Z1 of any central position point projected to the radiation coverage field of view on the projection array satisfies:
the distance Z2 from any micropore in the micropore array to the central position point of the signal receiving surface of the collimator satisfies the following conditions:
the deflection angle theta of the central axis of any micro-hole with respect to the central position point O of the collimator is as follows:
7. a nuclear radiation imaging device comprising a nuclear radiation signal collimator opened according to the nuclear radiation imaging collimator micropore positioning method of any one of claims 1 to 6, wherein the imaging device further comprises:
the nuclear radiation sensor is used for receiving radiation signals in an area and converting the radiation signals into digital signals, the assembling surface of the nuclear radiation signal collimator is attached to the sensing surface of the nuclear radiation sensor, the surface, which is not attached to the sensing surface of the nuclear radiation sensor, of the nuclear radiation signal collimator is a receiving surface, and an optical filter is arranged on the receiving surface;
at least one visible light optical image sensor that receives visible light signals within an area and converts the visible light signals to digital signals, wherein,
the digital signal conversion device further comprises a data processor which processes the 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 signal converted by the nuclear radiation sensor and acquires the local position and the global position of the point with the maximum radiation intensity in the current receiving area;
the interpolation processing module is used for performing 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 superposes the signal distribution state diagram and an optical imaging diagram shot by the visible light optical image sensor.
9. The nuclear radiation imaging device of claim 8, wherein the registration module acquires a background signal of radiation imaging and cancels the background signal prior to registration.
10. The nuclear radiation imaging device of claim 9, comprising a carrier frame structure, and a plurality of visible light optical sensors carried by the carrier frame structure with the nuclear radiation sensors, 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 |