Classifications

• • G—PHYSICS
  • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
  • G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
  • G21K4/00—Conversion screens for the conversion of the spatial distribution of X-rays or particle radiation into visible images, e.g. fluoroscopic screens

Definitions

• the present invention further ⁇ about the excitation light or excitation light and bright ⁇ light in the photostimulable ⁇ light body plate using the scatter preventing means against its read-device, speaking
• Radiation images are often used for disease diagnosis and the like.
• the X-rays that have passed through the subject are irradiated onto the phosphor layer (fluorescent screen) to generate visible light, which is then converted into silver salt.
• a so-called radiographic image is used, which is developed by irradiating a film using a so-called photographic film, and the conventional silver salt sensitizer is directly or indirectly applied to the film coated on the sheet.
• a high-sensitivity, high-resolution X-ray imaging system has been developed as a system that can replace the X-ray imaging device that records two-dimensional G-ray images. Background technology
• the fluorophores used in this system are sources of radiation such as X-rays. When it receives ruggy, it stores some of its energy. This condition is relatively stable and can be maintained for a long time or for a long time.
• the phosphor in this state is irradiated with the first light that acts as the excitation light, the stored energy is emitted as the second light.
• the first light is not limited to visible light, but light of a wide wavelength range from infrared rays to ultraviolet rays is used. However, the choice depends on the phosphor material used.
• the second'lights also vary from infrared to ultraviolet. The difference also depends on the fluorescent material used.
• This second electromagnetic wave is received, converted into an electric signal by a photoelectric converter, and then converted into a digital signal to obtain digital image information.
• the photostimulable phosphor layer that has been conventionally used. Was not transparent to the first light, that is, the excitation light, or to the second light, that is, the stimulated emission light, and showed a strong scattering phenomenon. Therefore, even if the excitation light flux of the same size as or less than one pixel is applied to the photostimulable phosphor layer, the excitation light flux is scattered very widely, and, for example, a phosphor with a thickness of 0.3% is used.
• the surface opposite to the irradiation surface has a diameter of 1 yr or more and, in some cases, a diameter of 3 yr or more. ..
• the present invention was created in view of such technical problems, and an object of the present invention is to provide a photostimulable phosphor body that does not scatter excitation light and photostimulable light.
• micro holes 2 6 in which a photostimulable phosphor 6 is embedded in a hole forming part 2 which is processed to be opaque to excitation light and has almost the same size are intersected.
• the hole forming part 2 is provided at each intersecting position in the difference direction, and the exciting light is impermeable to each other at each intersecting position in the intersecting direction.
• Each of the hole forming positions of the substrate which is a regularly arranged position in which the hole forming positions are displaced by a predetermined value necessary to bring them closer to each other, has substantially the same size, and the inner wall surface 2 thereof is Micro holes 26 that are opaque to excitation light are provided, and photostimulable phosphors are embedded in each of the micro holes 26, and the hole forming positions for at least the eye contact are predetermined.
• Microholes 26 that are approximately equal in size and whose inner wall surface 2 is processed to be opaque to excitation light at each hole formation position of the substrate that is displaced by a value and has a regular array position, and the microholes.
• 2 6 A light-transmissive sealing material 4 arranged on the light-transmitting side surface of the forming substrate, and a sealing material 5 arranged on the surface opposite to the light-transmitting side surface of the 6-forming substrate. This is achieved by providing a photostimulable phosphor 6 filled in the minute holes 26 sealed by the light transmissive sealing material 4 and the sealing material 5.
• the micro holes 16 are arranged in a grid pattern, and the micro holes 16 are arranged in the sub-scanning direction of the excitation light scanning, and in the main scanning direction.
• the read line pitch which is the size of the pixel in the secondary scanning direction, and the scanning efficiency of the excitation light scan? ?
• a latent image of the subject is formed as an energy distribution pattern using X-ray energy on the photoluminescent plate 105, and the latent image is read using excitation light.
• a stimulable phosphor is formed in the hole forming part 2 which is processed to the excitation light opaque substrate with the same size.
• One pixel of the subject image is formed in each of the corresponding integer holes of 1 or more of the photostimulable phosphor plate formed by forming the embedded micro holes 2 at each intersection position. Stored in an integer number of small holes This is achieved by reading out each of the stacked pixels and reproducing them.
• a digital X-ray device that uses X-ray energy to form a latent image energy distribution pattern of the subject on the photoluminescent body 105 and reads the latent image using excitation light is used.
• the hole forming part (2) processed to be opaque to the excitation light there is a micro hole in which a photostimulable phosphor is embedded, and the plate surface other than the micro hole is reflective to the excitation light.
• Fluorescence condensing means Fluorescence condensing means, reflection excitation light condensing means for condensing the light in which the excitation light is reflected from the photostimulable phosphor plate, and a signal obtained from the reflection excitation light condensing means
• Excitation light irradiation period determination means for determining the period during which the excitation light is irradiated to the microhole in which the photostimulable phosphor is embedded; and the excitation light irradiation period determination means for determining the period during which the excitation light irradiation period is determined.
• the purpose is achieved by sampling the photostimulable light obtained by the light collecting means as pixel information.
• Figure 1 is an illustration of excitation light scattering in a conventional photostimulable phosphor
• FIG. 2 is a cross-sectional view of the photostimulable phosphor of the present invention
• FIG. 3 is an explanatory diagram of excitation light scattering in the photostimulable phosphor of the present invention
• FIG. 4A is a diagram showing a manufacturing process of the photostimulable phosphor of the present invention.
• FIG. 4B is a diagram showing a manufacturing process of the photostimulable phosphor of the present invention.
• Fig. 5 is a diagram of a photostimulable phosphor plate with circular microholes
• Fig. 6 is a diagram showing various planar shapes of microholes
• Fig. 7 is a diagram showing various cross-sectional shapes of microholes
• Fig. 8 is a circle.
• FIG. 9 shows the photostimulable phosphor plate of the third embodiment
• Fig. 10 is a block diagram of a digital X-ray reader.
• Fig. 11 is a diagram showing the pixel formation form and the number of minute holes in it.
• Fig. 12 shows the configuration of the digital X-ray that synchronizes the reflected excitation light.
• Figure 13 is a circuit diagram for synchronizing the reflection excitation light
• Figure 14 is a timing chart of the circuit diagram for synchronizing the reflection excitation light.
• FIG. 2 shows the first embodiment of the present invention
• FIG. 2A shows that the photostimulable phosphor 6 is embedded in the hole forming portion 2 which is processed to be opaque to excitation light and has substantially the same size.
• Micro hole 2 It is a photostimulable phosphor plate with 6 provided at each intersection in the intersection direction.
• FIG. 2B shows, at each crossing position in the crossing direction, a hole forming part 2 which is processed to be opaque to excitation light and has a substantially equal size, and is arranged on the light transmitting side of the hole forming part 2.
• the X-ray energy of the subject pattern which is irradiated with X-rays and transmitted through the subject, is distributed to each of the photostimulable phosphors 6 in the micro holes 2 6 that are regularly arranged in the photostimulable phosphor plate. Accumulated.
• the excitation light beam is scanned on the photostimulable phosphor plate having this energy distribution pattern, and the subject pattern formed as an energy distribution pattern there is taken out as an electric signal pattern and used for its use.
• the excitation light is scanned through the regularly arranged micro holes 26 of the photostimulable phosphor plate along one of the intersecting directions. Since the photostimulable phosphor irradiated with the excitation light is contained in the hole wall 2 impermeable to the excitation light, it does not scatter. Therefore, it is possible to completely prevent the spatial resolution from being degraded. Figure 3 shows how this is prevented.
• This manufacturing method is a method by etching.
• a resist pattern for forming micro holes in a thin stainless plate is manufactured using a known CAD technique.
• the size of the hole-corresponding part of the pattern should be smaller than the size of the micro holes.
• Masks 2 2 and 2 3 are formed on both sides of the stainless steel plate 20 using this resist pattern (see Fig. 4A).
• 2 4 is a mask hole of masks 2 2 and 2 3.
• An etching agent is applied to the stainless steel support 20 through the formed mask holes 24 to form micro holes 26 as shown in Fig. 4B.
• 2 8 is a hole wall.
• the adhesive 30 is applied to the hole wall plate surface area 29 by screen printing (Fig. 4C). As shown in Fig. 4C).
• this adhesive 30 ⁇ is applied to both sides of the stainless steel plate 2 0 z sandwiched between them, and to the stainless steel plates 20 0 ,, 2 0 3 sandwiched between them. , it applied only to the stearyl emissions less plate surface sandwiching the stearyl emissions less plate 2 0 2.
• G 32 is a glass frame. After bonding process is completed, overlapping if I have been three stearyl emissions less plate 2 0, or 2 0 3 has been made form, the deeper Ku powder stimulable ⁇ the light in summer and small holes 2 6 are After filling with 6 (BaFEr: Bu 2- ) (see Fig. 4E), a protective layer of polyester "34 (see Fig. 4F) is formed on it to form a photostimulable phosphor coating. Made Made (see Figure 5).
• the wall surface of the minute hole 26 has an optical surface and efficiently reflects excitation light and stimulated emission light. As a result, the excitation light does not pass through the walls of the microholes, and the excitation light emitted from the excitation phosphor by irradiation of the excitation light can be efficiently collected (3rd step). (See figure). Therefore, it is possible to prevent deterioration of the spatial resolution of the image. Further, by the above-mentioned superposition, it is possible to increase the amount of photostimulable light emitted from the photostimulable phosphor by the excitation light irradiation. There is no reduction in spatial resolution.
• the thin stainless plate in the above embodiment may be another thin metal plate, a plastic plate, or the like.
• the method of forming the micro holes is not limited, but the micro holes 26 formed can have various shapes depending on the material and the forming means (see FIGS. 6 and 7). For example, if a hole with a diameter of 0.08 thighs is formed on a stainless steel plate with a thickness of 0. I ran by etching with vertical and horizontal pitches of 0.1 thighs each, the shape of the holes is completely straight. However, if the etching is performed from only one side, the other side becomes larger, and if the etching is performed from both sides, the center has a narrowed shape. Or it can be a different shape depending on how the mask holes are formed.
• a hole when a hole is formed by electric discharge machining, it can have various shapes such as a relatively straight shape, but it is possible to carry out the present invention regardless of the shape.
• the shape of the micropores is not particularly limited, but in practice, circles, ellipses, squares, rectangles, or polygons are used in manufacturing (see Fig. 6). If the wall surface of the micro hole formed in this way transmits the excitation light due to the property of the material, a material that does not transmit the excitation light may be applied to the wall surface of the micro hole or may be vapor-deposited to generate the excitation light. It is necessary to prevent penetration. Also, when the wall surface of the hole does not have surface accuracy in the optical sense, it is effective to apply resin to make it smooth and to form a highly reflective layer such as metal on it.
• the size of the microholes is not particularly limited-due to the technical difficulty of embedding the photostimulable phosphor in the microholes of a certain thickness, the lower limit of the size is 0.01 The upper limit is about 0.4 in terms of the spatial resolution required for X-ray image diagnosis.
• the direction of the minute holes with respect to the surface of the photostimulable phosphor plate is the vertical direction, but it may be completely vertical or oblique.
• diagonal micro-holes can be formed by arranging a large number of capillaries whose inner diameter is the same as that of the micro-holes in a square array, or by stacking them one by one. It can be manufactured by cutting, polishing, and cleaning.
• the shape of the inside of the hole may be straight or the size of the top and bottom may be different. Any forest material that forms a hole may have any mechanical strength after forming the hole.
• the glass plate is used on one side of the stainless plate after forming the micro holes. It is also possible to use a force, ', a metal sheet or the like. , It is preferable that the sheet reflects excitation light and stimulated emission light. Alternatively, the excitation light may be reflected but the stimulated emission light may be transmitted, and in the opposite case, the usage method, that is, the direction of excitation light irradiation and the direction of collection of stimulated emission light Yes, depending on your choice. It is also effective to form a cover having a function of a selection mirror on both sides by adhesion or the like.
• the type of force par is not particularly limited, but in order to prevent X-ray backscattering rays, it is also effective to use, for example, lead glass that passes excitation light and stimulated emission light and absorbs X-rays. It is also effective to stick a board.
• the photostimulable phosphor embedded in each microhole may be either opaque so that excitation light is scattered or transparent to excitation light or stimulated emission light.
• Any composition can be applied, and the composition is not limited, and the burying method is not limited, and the phosphor powder having a particle size of 5 m or less can be used.
• the powder is dispersed in the binder solution and poured, the phosphor powder is pressed into the microholes as it is, and then the binder is soaked in and the lift-off method is applied. It is possible to use various methods such as a method of forming a soluble layer later on the part, filling the inside of the hole by vapor deposition of the phosphor, and then removing the phosphor other than the hole. it can.
• a substrate having a regular array position which is the second embodiment, is displaced by a predetermined value necessary to bring the adjacent hole forming positions closer to each other.
• Microholes 26 of approximately the same size and whose inner wall surface 2 are opaque to excitation light are provided at each hole formation position, and a photostimulable phosphor is embedded in each microhole 26.
• the size is almost equal and the inner wall surface 2 has no excitation light.
• a sealing material 5 arranged on the surface opposite to the surface on the side and the light-transmissive sealing material 4 and the sealing material (5).
• the photostimulable phosphor 6 and the photostimulable phosphor 6 will be described.
• micro holes in the photostimulable phosphor plate of Example 2 ⁇ are shown in Fig. 8. As shown in FIG.
• the micro holes 26 are formed close to each other, the amount of the photostimulable phosphor plate embedded in the photostimulable phosphor plate is increased, and the amount of energy stored therein is increased. Helps prevent decline.
• a side sectional view of this second embodiment is as shown in FIG.
• the photostimulable phosphor irradiated with the excitation light is contained in the inner wall surface 2 which is impermeable to the excitation light as in the first embodiment, it is not scattered. Therefore, it is possible to completely prevent the spatial resolution from being lowered.
• This photostimulable phosphor plate is the same as that of the first embodiment, and the resist pattern as shown in FIG. 8 may be used.
• the photostimulable phosphor plate I 0 is composed of a plurality of stainless sheets 12. And each stainless sheet 12 has a thickness of 0.1 and a size of 380, and there are several micro holes in the central area (3 5 6 mra angle) 14. 1 6 are arranged in a grid.
• the size of one pixel is decided. For example, in the case of a photostimulable phosphor plate or sheet for the purpose of diagnosing breast cancer, the size of one pixel is approximately 50 m square.
• the unreasonable size is generated because it handles digital information and is not essential, but if it has a spatial resolution of about that level, it achieves the diagnostic purpose. Therefore, it is necessary to change the size of the pixel depending on the target diagnosis site, and in the present invention, it is possible to use various types of pixel-sized photostimulable phosphor plates or sheets.
• the smallest feasible pixel size is determined by the achievable pumping light beam diameter, and is currently about 20 square.
• the maximum pixel size is not limited in terms of feasibility, but in most cases, the pixel size larger than 0.4 is not sufficient for the diagnostic purpose. Therefore, the range of the size of one pixel in the present invention is 20 m square to 0.4 mm square, and the shape of the pixel may be not only square but also rectangular.
• the vertical and horizontal pitches are 1 ⁇ 5 um-
• the positional deviation ⁇ of the microholes 16 at the start and end points is 52.5 m
• the array of each microhole 16 is the sub-axis of the excitation light scan.
• the scanning direction longitudinal direction
• the main scanning direction horizontal direction
• the read line pitch which is the size of the pixel in the sub-scanning direction
• the scanning of excitation light scanning is performed.
• Etching is used to form the micro holes 16 in the stainless steel sheet 12, and the thermosetting epoxy resin is dissolved in an organic solvent to disperse the graphite powder.
• minute holes 16 are formed in the stainless sheet 12.
• Micro holes ! The stainless sheet 12 with 6 formed on it and the stainless sheet 12 coated with resin only on one surface are overlapped, and the thickness 0.2 without micro holes 16 is further Place the stainless steel sheet on one side, put a weight on it and set it at 180 and cure it.
• a reflective film for reflecting the excitation light is fixed to the wall of each microhole 16 c
• a phosphor powder consisting of BaClBr: Eu with a particle size of 5 m or less is dispersed in an organic solvent solution containing a binding agent, epoquine resin, and poured onto the above sheet under reduced pressure. Embed in the hole and dry. Repeat this operation 3 times to confirm that the photostimulable phosphor has been embedded up to the surface of the hole, and then wipe off the mixture of photostimulable phosphor and epoxy resin on the surface. It is then cured, and then a transparent polyester sheet is adhered to the surface as a protective layer.
• the photostimulable phosphor plate 10 produced as described above is
• the laser beam system is fixed to the stage and consists of a semiconductor laser with a wavelength of 780-lens diameter, a galvanometer, etc., and a laser beam system with a scanning efficiency of 70% is used.
• the 40 O laser was irradiated onto the photostimulable phosphor plate 10 in the scanning direction, the excitation light was transmitted through the photostimulable phosphors in the micro holes 16 and the other micro holes 16 It was confirmed that the particles were prevented from being scattered.
• the surface of the photostimulable phosphor substrate 10 is irradiated with X-rays, and the photostimulable light emitted as a result of the excitation by the pulsed laser is condensed by the converging mirror and the glass fiber array and is in the normal state.
• the light is received, the signal is A / D converted, and then the digital signal processing is performed.
• a fiber array other than the fiber array collects the reflected light of the excitation light from the wall surface of the micro hole 16 and collects it from the fiber array! ⁇ The received light.
• the e excitation light from the light receiving quantity is this Toga ⁇ IS is reflected from the wall surface also in this case is irradiated with X-ray of a standard dose, the standard output of each pixel It was possible to obtain a normal image by inputting it in the memory and correcting the change of the stimulated emission light amount over time and the correction 0 of the variation over time between each pixel.
• the size of the excitation light beam on the fluorescence plate or the node is It must be smaller than the length of one pixel in the sub-scanning direction.
• the degree is determined from the degree of wobble.
• Main scanning direction It is desirable that the length of each pixel be smaller than the length of one pixel in the secondary scanning direction.
• the excitation light may be continuous light or pulsed light, but the length of the excitation light beam in the main scanning direction is preferably as small as possible. Needless to say, it is necessary to scan so that the excitation light beam does not pass over the pixel that is adjacent in the sub-scanning direction. By paying attention to these points, it is possible to read an image with a predetermined spatial resolution without being affected by excitation light scattering.
• the excitation light scanning system and the condensing light receiving system are fixed and the photostimulable phosphor plate or sheet is moved or vice versa, the photostimulable phosphor plate or sheet and the sub-scanning direction
• the angle of is uniquely determined in relation to the excitation light scanning efficiency and the size of one pixel.
• Figure 1Q is a photostimulable phosphor reader.
• the latent image of the subject is formed by using X-ray energy and the latent image of the subject is formed as an energy distribution pattern on the photostimulable fluorescent plate 105 by using energy, and the latent image is read by using excitation light. It is a thing.
• the laser beam is scanned from the excitation light source 1 0 1 by the scanner 1 0 2 consisting of a galvanometer mirror or a polygon mirror.
• the scanned laser beam is composed of optical components such as an ⁇ lens for beam shape correction and a reflection mirror.
• the photostimulable phosphor 1 0 5 is scanned through 10 4 etc.
• Fluorescent light is collected by a condenser of 10 ⁇ such as a fiber array. The condensed light does not pass the excitation light from the fiber array, etc.
• the photoelectric converter such as a photoelectron tube
• the photoelectric converter such as a photoelectron tube
• the quantity is converted into an electrical signal, amplified by an amplifier 1109 and then exchanged into a digital signal by an A / D converter 1109.
• Di Sita Le signal temporarily stored in the off Remume mode Li 1 1 1, Oh Rui after 3 ⁇ 4 This stored without passing through the full Remume mode Li to the optical de-shrugging mode Li 1 1 2, the image processing at any time Processing such as gradation processing is performed in the processing unit 1 1 3 and displayed as an X-ray image on the image display unit 1 1 4 such as a CRT, or the X-ray film is displayed in a film writing device. It can be directly written and developed to obtain an X-ray image.
• This example is for reading the photostimulable phosphors of the first to third examples.
• the laser beam diameter on the surface of the photostimulable phosphor plate is the sub-scanning direction (the moving direction of the photostimulable phosphor) and the laser beam diameter is 70 m in the sub-scanning direction and 40 in the main scanning direction. ⁇ m
• the size of the laser beam is generally larger than that of the sub-scanning direction of 1 pixel. It is desirable that the length is less than.
• one standard pixel focused on this is set to be 176 m square, and there are 16 holes in each pixel (see I in Fig. 11-1). ) Exists.
• one pixel is to be 1 3 2 / m square, there are 9 holes (see E in Fig. I 1) in one pixel. At this time, the laser beam diameter in the sub-scanning direction is 1 2 ⁇ m, "5.
• one pixel is an 88 m square
• there are four holes (see ⁇ in Fig. 11) in one pixel one laser beam in the sub-scanning direction is used.
• Main scanning direction I set to 20 ⁇ m.
• the purpose of the present invention is achieved by setting the number of holes for one pixel to be 1 to 400.
• the reason for using an integral number of small holes in one pixel is that if two pixels share a part of a certain small hole, the spatial resolution will decrease accordingly.
• the scanning line for the photostimulable phosphor is Assume that there is a deviation. That is, the holes located on a certain main scanning line are arranged on a certain straight line, but consider the case where the excitation light is slightly deviated from that line. Excitation light does not necessarily illuminate the entire surface of one hole. That is, a certain hole is irradiated with the exciting light only in a part of the hole.
• the ratio of non-irradiation is relatively small when one pixel is formed by multiple holes compared to when one pixel is formed by one hole. Therefore, if a plurality of holes are set to one pixel, the reading accuracy will be improved and the reliability of the reading device will be increased.
• the light is condensed as shown in FIG. 10 in the scanning of the photostimulable phosphor plate.
• a G-beam array or a plastic fiber concentrator separate from the F,., And I-arrays in FIG.
• the reflected wave of the excitation light from the wall surface that does not form the hole of the body is condensed, and the light and the light from the photostimulable phosphor are synchronized, and the light from the photostimulable phosphor is emitted. It collects light.
• the excitation light & reflection from the wall surface is the photostimulable phosphor plate of the first to third embodiments configured so as to reflect the surface other than forming the hole of the photostimulable phosphor plate. It is realized by using it.
• Figure 12 shows the reflected excitation light pattern that collects the excitation light.
• the thing provided with the light guide path 113 is shown in figure.
• the same reference numerals as those in FIG. 10 are the same as those in FIG. 1 0 7 1 is an excitation light absorption filter. Since 10 7 collects photostimulable light, it must absorb the reflected wave of the excitation light.
• Excitation light absorption filter 10 * 71 absorbs light of 600 to 900 nm (wavelength of excitation light) and transmits light of 400 nm (wavelength of photostimulable light).
• Is. 1 15 is a condenser mirror that collects excitation light and photostimulable light so as not to scatter.
• 20 7 is a collection optical path for reflected excitation light.
• FIG. 2 0 7 1 is a photostimulable absorption filter, which absorbs light in the vicinity of 400 nm (wavelength of photostimulable light) and absorbs light of 600 to 900 nm (excitation light). Wavelengths).
• 208 is an optical sensor.
• This photosensor is a semiconductor sensor such as a photomultiplier tube or photo diode.
• the above photostimulable fluorescent absorption filter 2071 can be labor-saving by selecting an appropriate type of photomultiplier tube.
• Figure 12 is a picture of the timing of the sampling.
• reference numeral 108 is a photoelectric converter
• reference numeral 208 is an optical sensor, which are the same as those in FIG.
• Photostimulation and excitation light are input to the photoelectric converter 1 0 8 and the optical sensor 2 0 8 through the fiber array 1 0 7 and the reflection excitation light condensing light guide 2 0 7, respectively. ..
• the photostimulable fluorescent light input from the photoelectric converter 108 described above is converted into an electric signal and is converted into an A / D signal through the amplifier 109. Input to converter 1 1 0.
• the pumping light converted into an electric signal by the optical sensor 208 is compared with the reference voltage by the comparison circuit 209.
• Figure 14 shows the signal timing output from the circuit in Figure 13. As shown in Fig. 13, the comparator circuit 209 outputs a signal when the electrical signal from the optical sensor is below the reference voltage.
• the optical sensor 208 receives the excitation light.
• the excitation light scans line L in Fig. 11 1.
• the surface other than the holes strongly reflects the excitation light.
• the excitation light is absorbed and emits photoluminescent light, but there is some reflection. Therefore, the electric signal obtained from the excitation light received by the optical sensor 208 is as shown in 208 in Fig. 14 below.
• the voltage is high, it is the excitation light from the reflection part, and when it is low, it is the reflection from the hole where the photostimulable phosphor is embedded.
• the reason for comparing the reference voltage in the comparative image path 209 is to distinguish the hole portion and the reflection portion.
• the output of the comparator circuit 209 is input to the fly ':' flop loop 210, and the flip flop 210 is a signal synchronized with the clock input to itself. Is output.
• the output of the above-mentioned frisotop flosc 210 is clocked and added at the address 211, and the operation clock is output to the ⁇ -D converter 1 110. Is entered. That is, encouragement When the electrical signal of the light (the output of the optical sensor 208) is lower than the reference voltage, the A / D converter 110 operates and the electrical signal of the fluorescent emission (the output of the amplifier 109) is generated. Digitally converted. The digitally converted value is added by an adder 2 17 while the output of the analog gate 2 11 is on, and a flip-flop 2 1 8 (this flip-flop is added). Is stored in multiple drawings and is omitted in the drawing).
• the adder 218 While the adder 218 is performing the addition, the output of the aggregate 211 is input to the counter 216 and the number of clocks is counted. When the output of flip-flop 210 is turned off, the counter is cleared and its value is stored in flip-flop 211.
• the sum of the outputs of the 8 A / D converters is divided by the value of the power counter stored in the flyback flow knob 2 15 and the value is output to the memory 1 11 1. That is, by receiving the excitation light, the excitation light is sampled while the excitation light is passing through the hole in which the excitation light body is embedded. The outputs were added and the average was calculated, but the present invention is not limited to this. The added value may be simply obtained or integrated. By receiving the excitation light at the time when the addition timing or integration is performed at that time, the timing can be changed as described above. o 5 should be taken.
• the excitation light opaque microscopic region is formed, and the photostimulable phosphor plate having a structure in which the photostimulable phosphor is embedded in the microscopic region is also provided.

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• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• High Energy & Nuclear Physics (AREA)
• Conversion Of X-Rays Into Visible Images (AREA)
• Measurement Of Radiation (AREA)

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• 1990
  • 1990-03-30 WO PCT/JP1990/000434 patent/WO1990012405A1/ja active IP Right Grant
  • 1990-03-30 DE DE69024610T patent/DE69024610T2/de not_active Expired - Fee Related
  • 1990-03-30 EP EP90905637A patent/EP0426865B1/de not_active Expired - Lifetime

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