CN214387481U - Device for evaluating precision of collimator - Google Patents
Device for evaluating precision of collimator Download PDFInfo
- Publication number
- CN214387481U CN214387481U CN202022407329.3U CN202022407329U CN214387481U CN 214387481 U CN214387481 U CN 214387481U CN 202022407329 U CN202022407329 U CN 202022407329U CN 214387481 U CN214387481 U CN 214387481U
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- collimator
- model plate
- led lamp
- evaluating
- pinhole
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Abstract
A device for evaluating the precision of a collimator comprises a test bracket, an LED lamp and a model plate; the method is characterized in that: the test support is fixed with the multi-hole collimator, and LED support mounting holes are formed in the test support; the LED lamp bracket is fixedly arranged in the LED bracket mounting hole of the test bracket; the LED lamp is fixed on the LED lamp support and is arranged at the focus center position of the multi-pinhole head of the multi-pinhole collimator; the model plate is fixed on the rear surface of the multi-pinhole collimator, an adjusting gasket is arranged between the rear surface of the multi-pinhole collimator and the model plate, and the model plate is located at the theoretical position of the crystal surface of the detector. The invention has the beneficial effects that: the invention can evaluate the machining and assembling precision of the collimator in the early stage of putting the multi-pinhole collimator into use, thereby avoiding the waste of time and resources.
Description
Technical Field
The utility model relates to a nuclear medicine is collimator for image detector, especially a device of aassessment multiple needle hole collimator precision.
Background
The multi-pinhole collimator is composed of a plurality of pinhole heads with different inclination angles, and is matched with other structural components to form an assembly. After the multi-pinhole collimator is assembled, certain assembly errors exist. The actual angle of each pinhole head is taken as a key point of the collimator, and whether the inclination angle meets the use requirement of the collimator or not is difficult to evaluate through a conventional size measurement means. The assembled collimator is usually directly installed in a detector device, a radioactive source, an acquisition system and a processing system are used for carrying out image acquisition on the multi-pinhole collimator, and whether the performance of the collimator meets the requirements or not is evaluated through an image acquisition result. However, after the multi-pinhole collimator is assembled, the mechanical performance of the multi-pinhole collimator cannot meet the design requirement in the early stage due to the accumulation of processing deviation or assembly errors, and the performance of the collimator is evaluated through image acquisition in the later stage, so that the waste of time and resources is caused.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a solve above-mentioned not enough, a device of aassessment collimator precision. The method is used for evaluating the machining and assembling precision of the multi-pinhole collimator at the early stage of putting the multi-pinhole collimator into use.
In order to achieve the above purpose, the present invention adopts the following technical solution.
The utility model discloses a device for evaluating the precision of a collimator, which comprises a test bracket, an LED lamp, a model plate and a porous collimator; the test support is fixed with the multi-hole collimator, and LED support mounting holes are formed in the test support; the LED lamp bracket is fixedly arranged in the LED bracket mounting hole of the test bracket; the LED lamp is fixed on the LED lamp support and is arranged at the focus center position of the multi-pinhole head of the multi-pinhole collimator; the model plate is fixed on the rear surface of the multi-pinhole collimator, an adjusting gasket is arranged between the rear surface of the multi-pinhole collimator and the model plate, and the model plate is located at the position of the crystal surface of the detector.
Preferably, the collimator is a multi-pinhole collimator.
The test support and the porous collimator are fixedly connected in a screw fixing mode.
The LED lamp is fixed on the LED lamp support in a mode of bonding the back double-sided adhesive tape.
And a grid graph of 1mm x 1mm is arranged on the model plate and is used for determining the position of the projection light spot.
The model plate is made of semitransparent plastic materials, and projected light spots can be viewed on the front side and the back side of the model plate.
The model plate is fixed on the rear surface of the collimator by one of adhesion and screws.
The model plate is located at the position of the crystal surface of the detector, the distance between the crystal surface of the detector and the rear surface of the collimator is determined through a design value, and adjusting gaskets with the same thickness are arranged at four corners between the rear surface of the collimator and the model plate, so that the LED light projection is not influenced, and the model plate can be located at the same position as the crystal surface.
The utility model discloses beneficial effect: the utility model discloses can put into use earlier stage at many pinhole collimater, aim at straight ware machining and assembly precision and assess, avoid the waste of time and resource.
Drawings
FIG. 1: the utility model discloses device structure picture.
FIG. 2: the utility model discloses the model plate schematic diagram.
FIG. 3: the utility model discloses gather the facula sketch map.
FIG. 4: the utility model discloses deviation measurement schematic diagram.
In the figure: the LED lamp testing device comprises a testing support (1), an LED lamp support (2), an LED lamp (3), a model plate (4) and a porous collimator (5).
Detailed Description
Specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the device for evaluating the precision of the collimator of the present invention comprises a test support (1), an LED lamp support (2), an LED lamp (3), and a model plate (4); the test support (1) is fixed with the multi-hole collimator (5), and LED support mounting holes are formed in the test support (1); the LED lamp bracket (2) is fixedly arranged in the LED bracket mounting hole of the test bracket; the LED lamp (3) is fixed on the LED lamp bracket (2) and is arranged at the focus center position of the multi-pinhole head of the multi-pinhole collimator; the model plate (4) is fixed on the rear surface of the multi-pinhole collimator, an adjusting gasket is arranged between the rear surface of the multi-pinhole collimator and the model plate (4), and the model plate (4) is located at the theoretical position of the crystal surface of the detector; the test support (1) is fixedly connected with the porous collimator (5) in a screw fixing mode. The LED lamp is fixed on the LED lamp bracket in a mode of bonding a back double-sided adhesive tape; the model plate is fixed on the rear surface of the collimator by adopting one of sticking and screws; the position of the model plate (4) is the theoretical position of the crystal surface of the detector, the distance between the crystal surface of the detector and the rear surface of the collimator is determined according to the theoretical design value, and adjusting gaskets with the same thickness are arranged at four corners between the rear surface of the collimator and the model plate, so that the LED light projection is not influenced, and the position of the model plate is ensured to be the same as the position of the crystal surface.
As shown in fig. 2, a 1mm by 1mm grid pattern was placed on the former plate for the position determination of the projected spots. The model plate is made of semitransparent plastic materials, and the projected light spots can be viewed on the front side and the back side of the model plate.
As shown in fig. 3, the light emitted from the LED lamp (3) passes through the collimator to form a light spot on the mold plate (4).
As shown in fig. 4, the outer ring is a theoretical projection spot, and the inner ring is an actual projection spot of the LED lamp (3). And respectively obtaining the central positions of the two circular rings, and measuring the distance between the centers of the two light spots to obtain the deviation between the actual projected light spot and the theoretical light spot. And evaluating whether the machining and assembling precision of the multi-pinhole collimator meets the use requirement or not through the measurement deviation value. If the measured distance is smaller than the theoretical value, the precision meets the requirement; otherwise, it is not satisfied.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (7)
1. A device for evaluating the precision of a collimator comprises a test bracket, an LED lamp and a model plate; the method is characterized in that: the test support is fixed with the multi-hole collimator, and LED support mounting holes are formed in the test support; the LED lamp bracket is fixedly arranged in the LED bracket mounting hole of the test bracket; the LED lamp is fixed on the LED lamp support and is arranged at the focus center position of the multi-pinhole head of the multi-pinhole collimator; the model plate is fixed on the rear surface of the multi-pinhole collimator, an adjusting gasket is arranged between the rear surface of the multi-pinhole collimator and the model plate, and the model plate is located at the position of the crystal surface of the detector.
2. An apparatus for evaluating the accuracy of a collimator according to claim 1, wherein: the test support and the porous collimator are fixedly connected in a screw fixing mode.
3. An apparatus for evaluating the accuracy of a collimator according to claim 1, wherein: the LED lamp is fixed on the LED lamp support in a mode of bonding the back double-sided adhesive tape.
4. An apparatus for evaluating the accuracy of a collimator according to claim 1, wherein: and a grid graph of 1mm x 1mm is arranged on the model plate and is used for determining the position of the projection light spot.
5. An apparatus for evaluating the accuracy of a collimator according to claim 1, wherein: the model plate is made of semitransparent plastic materials, and projected light spots can be viewed on the front side and the back side of the model plate.
6. An apparatus for evaluating the accuracy of a collimator according to claim 1, wherein: the model plate is fixed on the rear surface of the collimator by one of adhesion and screws.
7. An apparatus for evaluating the accuracy of a collimator according to claim 1, wherein: the model plate is located at the position of the crystal surface of the detector, the distance between the crystal surface of the detector and the rear surface of the collimator is determined through a design value, and adjusting gaskets with the same thickness are arranged at four corners between the rear surface of the collimator and the model plate, so that the LED light projection is not influenced, and the model plate can be located at the same position as the crystal surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022407329.3U CN214387481U (en) | 2020-10-26 | 2020-10-26 | Device for evaluating precision of collimator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022407329.3U CN214387481U (en) | 2020-10-26 | 2020-10-26 | Device for evaluating precision of collimator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214387481U true CN214387481U (en) | 2021-10-15 |
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ID=78033016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022407329.3U Active CN214387481U (en) | 2020-10-26 | 2020-10-26 | Device for evaluating precision of collimator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214387481U (en) |
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2020
- 2020-10-26 CN CN202022407329.3U patent/CN214387481U/en active Active
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