CN201917666U - Radiation imaging system based on radiophotolumine scence image plate with radiation memory function - Google Patents
Radiation imaging system based on radiophotolumine scence image plate with radiation memory function Download PDFInfo
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- CN201917666U CN201917666U CN2010205299801U CN201020529980U CN201917666U CN 201917666 U CN201917666 U CN 201917666U CN 2010205299801 U CN2010205299801 U CN 2010205299801U CN 201020529980 U CN201020529980 U CN 201020529980U CN 201917666 U CN201917666 U CN 201917666U
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Abstract
The utility model belongs to the technical field of radiation measuring, and relates to a radiation imaging system based on a radiophotolumine scence image plate with the radiation memory function in particular. The radiation imaging system comprises a masking frame body, a pinhole collimator, a position sensitive light detection module as well as a control and image processing module. The pinhole collimator is arranged at the front end of the masking frame body; the position sensitive light detection module is arranged at the back end of the masking frame body and the light detection surface of the position sensitive light detection module is just opposite to the pinhole collimator; the control and image processing module is connected with the position sensitive light detection module; moreover, the image plate manufactured by a radiophotolumine scence material is also arranged between the pinhole collimator and the position sensitive light detection module; an excitation light source corresponding to the radiophotolumine scence material is arranged at the back end of the masking frame body; and a shutter is arranged at the back end of the masking frame body. The radiation imaging system can measure X rays or gamma rays with extremely low intensities, and can be broadly used for the radiation intensity and radiation imaging measurement in low-radiation occasions.
Description
Technical field
The utility model belongs to the radiometric technique field, is specifically related to a kind of radiation image-forming system based on the radiophotostimulation image plate with radiation memory function.
Background technology
Nuclear Medicine Dept of hospital can be by analyzing the distributed image of radioactive nuclide in human organ, various organ diseases such as diagnosis patient cardiovascular and cerebrovascular disease, tumour.Be used for the radiant image measuring system of the radiographic source distribution measuring of X ray or gamma rays, be called gamma camera usually, at first grow up at the field of nuclear medicine.
There have been a lot of medical apparatus corporation, Ltds to develop the gamma camera system that is used for human body X ray or gamma rays distribution measuring so far.These gamma camera are mainly by collimating apparatus, the scintillation crystal plate, and the position sensitive light-detecting device is formed.
It is very big that the material of collimating apparatus is generally atomic number, to X ray or the extraordinary metal material of gamma rays blocking effect, and such as lead, tungsten etc.The collimating apparatus kind mainly contains parallel aperture collimator, pinhole collimator, diverging collimator, convergent type collimating apparatus; Be used to limit the direction and the scope of the incident ray that enters the gamma camera visual field.
Ray is through arriving the scintillation crystal plate after the collimating apparatus.The material of scintillation crystal is mainly NaI (Tl) crystal, also can be CsI or BGO etc.Energy deposition takes place in ray in scintillation crystal, the energy of deposition discharges in the position of energy deposition in the mode of fluorescence again.
The position sensitive light-detecting device of scintillation crystal plate back can be measured position and intensity that fluorescence discharges, thereby reaches the purpose of imaging.The position sensitive light-detecting device can be single position sensitive photo-multiplier tube, perhaps the position sensitive photo-multiplier tube array.The entrance window of position sensitive photo-multiplier tube is pressed close to the scintillation crystal plate by photoconduction, reaches the measurement purpose.The position sensitive light-detecting device also can be charge-coupled device (CCD) or CMOS.
This class gamma camera system that grows up at present, the real time imagery that can be used for X-radiation field or gamma radiation field is measured.In the nuclear medicine application,, can utilize this class gamma camera system to obtain the static in vivo and dynamic continuous distributed image of nucleic easily because the radioactive level in the human body is higher usually.But the increased radioactivity that this class gamma camera system is used for the nuclear industry field is measured, and when measuring such as the radioactive contamination distributed image in certain place, then meets difficulty through regular meeting.Radiation level such as place to be measured or object is very low, when being lower than the minimum detection limit of existing this class gamma camera system, so, with the distributed image of measuring less than radioactive source.Under existing this type systematic,, do not have tangible effectiveness, because this can not improve the signal to noise ratio (S/N ratio) of measurement by prolonging the method for Measuring Time yet.
The utility model content
(1) utility model purpose
The utility model purpose is to solve the problem that gamma camera system in the prior art can't survey faint radiation signal.
(2) technical scheme
For achieving the above object, the utility model provides following technical scheme:
A kind of radiation image-forming system based on radiophotostimulation image plate with radiation memory function, comprise the shading framework, pinhole collimator, position sensitive photodetection module, control and image processing module, described pinhole collimator is positioned at the shading frame forward end, position sensitive photodetection module places shading framework rear end and its photodetection face over against pinhole collimator, control links to each other with position sensitive photodetection module with image processing module, and its key is: also be equipped with the image plate of being made by the radiophotostimulation material between described pinhole collimator and position sensitive photodetection module; Be equipped with and the corresponding excitation source of described radiophotostimulation material in the rear end of described shading framework; Also be equipped with shutter in described shading framework rear end.
The pin hole place of described pinhole collimator also is equipped with anti-dazzling screen, and described anti-dazzling screen is made by the material that is easy to transmitted X-rays and gamma rays.
Be equipped with heater strip between described pinhole collimator and the image plate, described heater strip is a helicoidal structure.
Make the phosphate glass that the used radiophotostimulation material of image plate is the silver ion activation, perhaps other has the radiophotostimulation material of radiation memory function.
Described image plate is coated with one deck aluminium foil near a side of pinhole collimator.
Described excitation source be round shape be evenly distributed on position sensitive photodetection module around.
Described heater strip and image plate can move forward and backward along the radioactivity detection, identificationm, and computation central axis direction in the shading framework.
Described position sensitive photodetection module comprises shading outer wall and the photodetector that is placed in one, and is equipped with the optical filter that can filter exciting light towards an end of image plate, and its end near control and image processing module is equipped with power interface and data-interface.Described photodetector is position sensitive photo-multiplier tube, CCD or CMOS.
When described photodetector is position sensitive photo-multiplier tube, image plate is pressed close to the exciting light optical filter, can measure the position and the strength information of the fluorescence signal that the radiophotostimulation material sends.
When described photodetector is CCD or CMOS, between described optical filter and CCD or CMOS, is equipped with conical fiber and becomes video beam.
When described photodetector is CCD or CMOS, between described optical filter and CCD or CMOS, be equipped with imaging lens group, and the sensitive chip of described CCD or CMOS is positioned on the picture plane of imaging lens group.
(3) beneficial effect
Because the image plate that described radiophotostimulation material is made can be stored as the sedimentary energy of incident X-rays or gamma rays fluorescence centre and accumulate for a long time, in the process of this signal accumulation, because position sensitive photodetection module is in closed condition, can not increase the electronics noise, it is a process that can significantly improve signal to noise ratio (S/N ratio), therefore radiation image-forming system provided by the utility model can be measured intensity extremely low X ray or gamma rays, and the radiation intensity and the radiant image that can be widely used in low radiation place are measured.
Description of drawings
Fig. 1 is the structural drawing based on the radiation image-forming system of the radiophotostimulation image plate with radiation memory function;
Fig. 2 is the sectional view of A-A direction among Fig. 1;
Fig. 3 is first instantiation of position sensitive photo measure device among Fig. 1;
Fig. 4 is second instantiation of position sensitive photo measure device among Fig. 1;
Fig. 5 is the 3rd instantiation of position sensitive photo measure device among Fig. 1;
Internal system structural map when Fig. 6 carries out data read for position sensitive photo measure device;
Structural representation when Fig. 7 heats image plate for the erasure signal heater strip.
Embodiment
Below in conjunction with specific embodiment the utility model is described further.
Embodiment one
The radiation image-forming system based on the radiophotostimulation image plate with radiation memory function that present embodiment provides as shown in Figure 1, comprises shading framework 5, pinhole collimator 1, position sensitive photodetection module 2, control and image processing module 9 etc.Described pinhole collimator 1 is positioned at shading framework 5 front ends, position sensitive photodetection module 2 places shading framework 5 rear ends and its photodetection face over against pinhole collimator 1, control links to each other with position sensitive photodetection module 2 with image processing module 9, key is, also is equipped with the image plate of being made by the radiophotostimulation material 7 between described pinhole collimator 1 and position sensitive photodetection module 2; Be equipped with and the corresponding excitation source 3 of described radiophotostimulation material in the rear end of described shading framework 5; Also be equipped with shutter 4 in described shading framework 5 rear ends.
The ray that measured X ray or gamma ray radiation source send, the pin hole by pinhole collimator 1 enters measuring system.Described pinhole collimator 1 has the advantages that the visual field is big, imaging is little, pinhole collimator 1 adopt can radiation-screening the very big metal material of atomic number make, as lead, tungsten etc.The pin hole place of pinhole collimator 1 also is equipped with very thin anti-dazzling screen, and described anti-dazzling screen is made by the material that is easy to transmitted X-rays and gamma rays, such as aluminium foil etc.
Carry out record from the X ray or the gamma rays of the pin hole incident of pinhole collimator 1 by image plate 7, image plate 7 is installed in the shading framework 5 by fixed mount 6.Described image plate 7 is by radiophotostimulation (the Radio photoluminescence that can convert incident X-rays or gamma rays to fluorescence signal, RPL) material is made, the above-mentioned material component is preferably the phosphate glass of silver ion activation, perhaps also can select other to have the radiophotostimulation material of radiation memory function.Above-mentioned radiation radiophotostimulation material with radiation memory function can convert the sedimentary energy of incident X-rays or gamma rays to fluorescence centre at the incidence point place and accumulate, and sedimentary energy is big more, and the fluorescence centre of generation is just many more.Under the very low occasion of radiation level, can increase the Measuring Time of this radiant image measuring system, make the abundant energy of deposition in the radiophotostimulation material, store abundant fluorescence centre, after preparing, read with position sensitive photodetection module 2.
Be equipped with heater strip 11 between described pinhole collimator 1 and the image plate 7, its effect is by heating image plate 7 fluorescence signal of storing on it to be eliminated fully after one-shot measurement is finished.The structure of heater strip 11 is the spiral fashion resistive heater of a dish even thickness as shown in Figure 2, is installed between pinhole collimator 1 and the image plate 7.Heater strip 11 and image plate 7 all can be controlled and be moved forward and backward in shading framework 5 by stepper motor or servomotor.When not needing to eliminate the signal of storing in the radiophotostimulation material, heater strip 11 is close to the side near pinhole collimator 1, does not influence pin-hole imaging; After the radiant image measurement is finished, eliminate the signal of having stored in the radiophotostimulation material if desired, when preparation is measured next time, then need this heater strip 11 is pressed close to image plate 7 along the radioactivity detection, identificationm, and computation central axis direction, about 7 to 400 ℃ of image plates of heating also continue for some time, and reach the purpose of eliminating original signal.
Side near pinhole collimator 1 on image plate 7 is coated with one deck aluminium foil.Aluminium foil at first can shading, because this radiophotostimulation material itself is transparent, and the position sensitive photodetector that the position sensitive photodetection module 2 of image plate 7 back is used needs shading; Secondly, aluminium foil is hot good conductor, when for the signal of eliminating the storage of radiophotostimulation material it being heated, helps image plate 7 thermally equivalents that the radiophotostimulation material is made.
Described position sensitive photodetection module 2 comprises shading outer wall, power interface 15, data-interface 16 and photodetector, end towards image plate 7 is equipped with the optical filter 8 that can filter exciting light, and its end near control and image processing module 9 is equipped with power interface 15 and data-interface 16.The photodetector that is adopted in the present embodiment is a position sensitive photo-multiplier tube 14, as shown in Figure 3, when utilizing the de excitation fluorescence signal on the position sensitive photo-multiplier tube 14 measurement image plates 7, the image plate 7 exciting light optical filter 8 of trying one's best is measured.The optical filter 8 that is used to filter exciting light is between image plate 7 and position sensitive photo-multiplier tube 14 and be close to the test surface of position sensitive photo-multiplier tube 14.At wavelength is excitation source 3 about 370nm and the fluorescent wavelength ranges image plate 7 at 600nm to 700nm, the optical filter 8 that is adopted in the present embodiment is that cutoff wavelength is the long wave pass filter of 450nm, the fluorescence that sends when only allowing radiophotostimulation material de excitation sees through, and the exciting light that excitation source 3 is sent can't the sensitive photomultiplier 14 in in-position.
Interface, power interface 15 and data-interface 16 places of position sensitive photodetection module 2 and shading framework 5 all carry out airtight shading treatment.The aluminium foil that covers on pinhole collimator 1, shading framework 5 and the image plate 7 is realized the lucifuge to whole measuring system together.
Control module is mainly used in the more inner mechanical mechanisms of radiant image measuring system, and the control of on-off circuit.Control module is responsible for the control to the excitation source switch.Control module is also controlled radiophotostimulation images of materials plate along the axial displacement of radiant image measuring system, reaches the control survey visual field, and with image plate try one's best the purpose of position sensitive photo measure device.Control module needs to control erasure signal heater strip moving along central shaft simultaneously.Control module also needs to control the light masking flap shutter that is installed between image plate and the exciting light optical filter, when position sensitive photo measure device does not carry out the reading measurement, need all the time this light masking flap shutter to be closed, to realize shading state to position sensitive photo measure device.Image processing module is used to analyze the data that obtain from the position sensitive photo detecting unit, realizes the final imaging measurement function to distribution of radiation.Image processing module will be united with control module usually and be cooperated operation, to reach the optimal imaging effect.
When the radiant image that utilizes above-mentioned radiation image-forming system to carry out X ray or gamma radiation field is measured, measure the size in the visual field at first as required, adjust the distance of fixed mount 6 by control module from pinhole collimator 1, excitation source 3 and shutter 4 all are in closed condition, and erasure signal heater strip 11 is close to a side of pinhole collimator 1.After the regular hour irradiation, image plate 7 has been stored the image information that radiation source intensity distributes by the sedimentary energy of X ray or gamma rays.Open lucifuge door 4 by control module then, and fixed mount 6 is moved right to pressing close to position sensitive photodetection module 2, as shown in Figure 6.Open excitation source 3 this moment, and the fluorescence centre of the storage fluorescence signal that penetrates that is stimulated is measured by position sensitive photodetection module 2 on the image plate 7, and the image processing module by the back, obtains the image of distribution of radiation.After the radiant image measurement is finished, close excitation source 3 and shutter 4 by control module.Carry out next time if desired and measure, then earlier heater strip 11 is moved to the aluminium foil of image plate 7 outer side covers, as shown in Figure 7, use heater strip after 11 heating a period of times, close, can measure afterwards next time by control module.
Present embodiment provide the radiant image measuring system, can be according to the power of radiation field, regulate the time interval that single reads the distributed image signal of storing on the radiophotostimulation material, thereby when guaranteeing image quality, realize continuous imaging measurement.Simultaneously, because the radiophotostimulation material is a kind of material that can repeat to read, that is to say before the signal of in not opening erasure signal heater strip removal of images plate, storing, can read repeatedly to survey to image plate, but have the ability of repetition radiation field distribution image.
Embodiment two
The other technologies scheme is constant, is with the difference of embodiment one:
The photodetector that is adopted in the present embodiment is charge-coupled device (CCD) or CMOS 12, and is equipped with conical fiber becomes video beam 10 between described optical filter 8 and CCD/CMOS 12, as shown in Figure 4.The fluorescence signal that image plate 7 is excited to send becomes video beam 10 to be coupled to the surperficial and measured of CCD/CMOS 12 by conical fiber, has kept positional information and strength information simultaneously.
Embodiment three
The other technologies scheme is constant, is with the difference of embodiment one:
The photodetector that is adopted in the present embodiment is charge-coupled device (CCD) or CMOS 12, between described optical filter 8 and CCD/CMOS 12, be equipped with imaging lens group 13, the sensitive chip of described CCD/CMOS 12 is positioned on the picture plane of imaging lens group 13, as shown in Figure 5.The fluorescence signal that image plate 7 is excited to send is also measured by the surface that taper imaging lens group 13 is imaged onto CCD/CMOS 12, has kept positional information and strength information simultaneously.
Above content be in conjunction with preferred embodiment to specifying that the utility model is done, can not assert that embodiment of the present utility model only limits to these explanations.Concerning the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deductions and conversion, all should be considered as belonging to protection domain of the present utility model.
Claims (10)
1. radiation image-forming system based on radiophotostimulation image plate with radiation memory function, comprise shading framework (5), pinhole collimator (1), position sensitive photodetection module (2), control and image processing module (9), described pinhole collimator (1) is positioned at shading framework (5) front end, position sensitive photodetection module (2) places shading framework (5) rear end and its photodetection face over against pinhole collimator (1), control links to each other with position sensitive photodetection module (2) with image processing module (9), it is characterized in that: also be equipped with the image plate of being made by the radiophotostimulation material with radiation memory function (7) between described pinhole collimator (1) and position sensitive photodetection module (2); Be equipped with and the corresponding excitation source of described radiophotostimulation material (3) in the rear end of described shading framework (5); Also be equipped with shutter (4) in described shading framework (5) rear end.
2. radiation image-forming system according to claim 1 is characterized in that: the pin hole place of described pinhole collimator (1) also is equipped with anti-dazzling screen, and described anti-dazzling screen is made by the material that is easy to transmitted X-rays and gamma rays.
3. radiation image-forming system according to claim 1 is characterized in that: be equipped with heater strip (11) between described pinhole collimator (1) and the image plate (7), described heater strip (11) is a helicoidal structure.
4. radiation image-forming system according to claim 1 is characterized in that: make the phosphate glass that the used radiophotostimulation material with radiation memory function of image plate (7) is the silver ion activation.
5. radiation image-forming system according to claim 1 is characterized in that: described image plate (7) is coated with one deck aluminium foil near a side of pinhole collimator (1).
6. radiation image-forming system according to claim 1 is characterized in that: described excitation source (3) be round shape be evenly distributed on position sensitive photodetection module (2) around.
7. radiation image-forming system according to claim 3 is characterized in that: described heater strip (11) and image plate (7) can move forward and backward along the radioactivity detection, identificationm, and computation central axis direction in shading framework (5).
8. according to each described radiation image-forming system of claim 1～7, it is characterized in that: described position sensitive photodetection module (2) comprises shading outer wall and the photodetector that is placed in one, end towards image plate (7) is equipped with the optical filter (8) that can filter exciting light, and its end near control and image processing module (9) is equipped with power interface (15) and data-interface (16); Described photodetector is position sensitive photo-multiplier tube (14).
9. according to each described radiation image-forming system of claim 1～7, it is characterized in that: described position sensitive photodetection module (2) comprises shading outer wall and the photodetector that is placed in one, end towards image plate (7) is equipped with the optical filter (8) that can filter exciting light, and its end near control and image processing module (9) is equipped with power interface (15) and data-interface (16); Described photodetector is CCD or CMOS (12), and is equipped with conical fiber becomes video beam (10) between described optical filter (8) and CCD or CMOS (12).
10. according to each described radiation image-forming system of claim 1～7, it is characterized in that: described position sensitive photodetection module (2) comprises shading outer wall and the photodetector that is placed in one, end towards image plate (7) is equipped with the optical filter (8) that can filter exciting light, and its end near control and image processing module (9) is equipped with power interface (15) and data-interface (16); Described photodetector is CCD or CMOS (12), and is equipped with imaging lens group (13) between described optical filter (8) and CCD or CMOS (12), and the sensitive chip of described CCD or CMOS (12) is positioned on the picture plane of imaging lens group (13).
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| CN2010205299801U CN201917666U (en) | 2010-09-14 | 2010-09-14 | Radiation imaging system based on radiophotolumine scence image plate with radiation memory function |
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| CN2010205299801U CN201917666U (en) | 2010-09-14 | 2010-09-14 | Radiation imaging system based on radiophotolumine scence image plate with radiation memory function |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968545A (en) * | 2010-09-14 | 2011-02-09 | 中国原子能科学研究院 | Radiation imaging system based on photoluminescence image board with radiation memory function |
| CN102023308A (en) * | 2010-09-14 | 2011-04-20 | 中国原子能科学研究院 | Radiation imaging system based on radiation photoluminescence image board with radiation memory function |
| CN102830419A (en) * | 2012-08-08 | 2012-12-19 | 北京辛耕普华医疗科技有限公司 | Detector assembly for gamma radioactive source positioning instrument and manufacturing method thereof |
| CN104873217A (en) * | 2015-05-07 | 2015-09-02 | 管迪 | Ct scanner shielding device |
-
2010
- 2010-09-14 CN CN2010205299801U patent/CN201917666U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968545A (en) * | 2010-09-14 | 2011-02-09 | 中国原子能科学研究院 | Radiation imaging system based on photoluminescence image board with radiation memory function |
| CN102023308A (en) * | 2010-09-14 | 2011-04-20 | 中国原子能科学研究院 | Radiation imaging system based on radiation photoluminescence image board with radiation memory function |
| CN102830419A (en) * | 2012-08-08 | 2012-12-19 | 北京辛耕普华医疗科技有限公司 | Detector assembly for gamma radioactive source positioning instrument and manufacturing method thereof |
| CN102830419B (en) * | 2012-08-08 | 2015-04-22 | 北京永新医疗设备有限公司 | Detector assembly for gamma radioactive source positioning instrument and manufacturing method thereof |
| CN104873217A (en) * | 2015-05-07 | 2015-09-02 | 管迪 | Ct scanner shielding device |
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