Use of a fluorescent material in the manufacture of an x-ray dental imaging device

Abstract

The application discloses application of a fluorescent material in preparation of an X-ray dental imaging device, and a method of the application comprises the following steps: doping the fluorescent material into a film forming resin to obtain a film, and using the film in preparation of the X-ray dental imaging device; wherein the fluorescent material is a rare earth element doped alkaline earth metal halide. The X-ray dental imaging device prepared by the method has good image resolution, imaging density and use accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of radiographic technology. More particularly, it relates to the application of a fluorescent material in the preparation of an X-ray dental imaging device. BACKGROUND

[0002] X-ray imaging has a wide range of application requirements in the fields of non-destructive testing, medical diagnosis and scientific research. X-ray detectors are divided into the following types: the first type is composed of a sensitizing screen and a film. The sensitizing screen converts X-rays into visible light, making the film sensitive, thereby obtaining internal structural information of the object being irradiated.

[0003] The second type is indirect digital imaging, commonly known as CR. The main core material is rare earth-doped alkali and alkaline earth metals. The IP plate is a plate that temporarily stores the X-ray signal of the object being irradiated, forming a latent image. The IP plate is then placed in a laser scanner for scanning. Under laser excitation, photoexcitation produces visible light, which is received by a photoelectric receiver and converted into a digital signal, thereby obtaining a numerical X-ray image. The IP plate used in the X-ray digital imaging system can be reused thousands of times. The IP plate can be erased by strong light irradiation, so it can be reused. In recent years, IP plates have been widely used in dental diagnosis. The advantages are: convenient to use; comfortable experience for patients; 100% effective area; wireless, all dental specifications are used, and can be reused. There are many preparation methods for rare earth-doped alkaline earth metals, such as high-temperature solid-phase method, solution method and combustion method, etc. Among them, the high-temperature solid-phase method is widely used in X-ray IP plates due to its high fluorescence efficiency and stable sample performance. However, when it is used in dental imaging IP plate imaging, the image resolution, imaging density and use accuracy still need to be further improved. SUMMARY

[0004] Based on the above facts, the purpose of the present application is to provide an application of a fluorescent material in the preparation of an X-ray dental imaging device to improve the image resolution, photosensitivity, imaging density and use accuracy of the X-ray dental imaging device.

[0005] To achieve the above purpose, the present application provides the following technical solutions:

[0006] An application of a fluorescent material in the preparation of an X-ray dental imaging device, the method of the application comprising: doping the fluorescent material in a film-forming resin to obtain a film for the preparation of an X-ray dental imaging device.

[0007] The fluorescent material is a rare earth element-doped alkaline earth metal halide.

[0008] The rare earth element is doped into the crystal lattice of the alkali earth metal halide fluorescent substrate material, which is beneficial to improve the absorption and conversion of the IP plate to X-ray, and realizes the significant improvement of the image resolution and imaging density, and improves the imaging performance of the imaging material.

[0009] Further, the fluorescent material is in the form of particles with a particle size of 1-5 microns. It is found in the present application that the particle size of the granular fluorescent material affects the image resolution and imaging density of the X-ray dental imaging device. If the particle size of the fluorescent material is too large, it will affect the resolution of the X-ray dental imaging device; if the particle size of the fluorescent material is too small, it will affect the imaging density of the device. Further controlling the particle size of the fluorescent material within the above range can improve the X-ray imaging resolution and imaging density. For example, the particle size of the fluorescent material can be 1-4 microns, 1-3 microns, 1-2.5 microns, 1-2 microns, 2-5 microns, 2-4 microns, 2-3 microns, 2-2.5 microns, etc.

[0010] Further, the application comprises the following steps:

[0011] The fluorescent material and the film-forming resin are mixed to form a suspension, and an auxiliary agent is optionally added to obtain a coating liquid;

[0012] The coating liquid is applied to the substrate to form a film.

[0013] Further, the application comprises the following steps:

[0014] The film-forming resin is dissolved in a solvent and mixed with the fluorescent material to form a suspension, and an auxiliary agent is optionally added to obtain a coating liquid;

[0015] The coating liquid is applied to the substrate to form a film.

[0016] Further, the auxiliary agent includes but is not limited to one or more selected from a dispersing agent, a leveling agent, a plasticizer, and a defoaming agent.

[0017] Further, the substrate is selected from PET and / or PP.

[0018] Further, the solvent includes but is not limited to butanone, etc.

[0019] Further, the mass ratio of the fluorescent material to the film-forming resin is 4-19:1. The amount ratio of the fluorescent material to the film-forming resin also affects the imaging effect of the device. If the mass ratio is too low, it will affect the imaging density; if the mass ratio is too high, it will be difficult to form a film, and the bonding force between the fluorescent material and the substrate will be weakened.

[0020] Further, the mass ratio of the fluorescent material to the film-forming resin is 5.5-15:1. In this case, the imaging performance of the obtained X-ray dental imaging device is better. For example, the mass ratio of the fluorescent material to the film-forming resin includes but is not limited to 5.66:1, 15:1, etc.

[0021] Further, the film-forming resin is selected from one or more of polyvinyl butyral, polyvinyl alcohol, polyurethane, polyvinylidene fluoride and polymethyl methacrylate. The selection of the film-forming resin affects the luminescence performance of the fluorescent powder, thereby affecting the X-ray response of the device. When the film-forming resin is selected from polyvinyl butyral, the aforementioned effect is better.

[0022] Further, in the rare earth element-doped alkaline earth metal halide, the rare earth element is selected from one or more of europium, cerium and dysprosium. The doping of the aforementioned rare earth element can achieve the absorption conversion luminescence of the fluorescent material to soft X-rays.

[0023] Further, the alkaline earth metal halide is selected from one or more of barium bromide fluoride, strontium bromide fluoride, barium iodide bromide fluoride and strontium iodide bromide fluoride.

[0024] Further, the rare earth element-doped alkaline earth metal halide is selected from europium-doped barium iodide bromide fluoride and / or cerium-doped barium bromide fluoride. Preferably, the rare earth element-doped alkaline earth metal halide is europium-doped barium iodide bromide fluoride. In this case, when it is combined with the film-forming resin, especially polyvinyl butyral, the imaging resolution effect is optimal, which can make the X-ray dental imaging resolution reach more than 10 lp / mm; at the same time, it also takes into account the high sensitivity (high gray value).

[0025] Further, the thickness of the film is 100-200 μm. The thickness of the film affects the level of image resolution. When the thickness of the film is less than 100 μm, the film is too thin to effectively absorb X-rays, resulting in a decrease in image density. When the thickness of the film exceeds 200 μm, the film is too thick, X-rays are converted into visible light to form a halo, resulting in a decrease in resolution. For example, the thickness of the film includes but is not limited to 100 μm, 120 μm, 150 μm, 200 μm, etc.

[0026] Further, the preparation of the europium-doped barium iodide bromide fluoride includes the following steps:

[0027] The barium carbonate, barium fluoride, ammonium bromide, ammonium iodide and europium oxide are mixed uniformly, calcined and mechanically ball milled to obtain the europium-doped barium iodide bromide fluoride.

[0028] Further, the amount of each component is 5.5-15% of the total mass of the raw materials.

[0029] Barium carbonate 30-38wt%, barium fluoride 30-35wt%, ammonium bromide 25-30wt%, ammonium iodide 1-5wt% and europium oxide 0.1-1wt%.

[0030] Further, the temperature of the calcination is 300-1000℃, and the time is 5-10h.

[0031] Further, the temperature of the calcination is 400-800℃, and the time is 6-8h. At this time, the luminescent performance of the fluorescent material is more excellent.

[0032] In the above preparation method, the high-fluorescent-efficiency storage-type fluorescent material of rare earth element-doped alkaline earth metal halide is synthesized by using a high-temperature solid-phase method. The fluorescent material obtained by the preparation method has a regular structure and high fluorescent efficiency.

[0033] Further, the ball-milling condition is that the ball-milling frequency is 45Hz, and the ball-milling time is 4-8h.

[0034] Further, the X-ray dental imaging device is selected from dental imaging IP plates.

[0035] The beneficial effects of the present application are as follows:

[0036] The method for applying the fluorescent material in the preparation of the X-ray dental imaging device provided by the present application has the characteristics of fast imaging, high image resolution and high imaging density, and has outstanding imaging performance, so that the X-ray imaging resolution can reach 10lp / mm. Meanwhile, the imaging device also has the characteristics of high photosensitivity and strong use accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0037] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0038] Figure 1 A resolution graph showing the performance test of experimental example 1 is shown.

[0039] Figure 2 A picture showing the application of example 1 in the dental field is shown. DETAILED DESCRIPTION

[0040] In order to more clearly illustrate the present application, the present application will be further described below with reference to the preferred embodiments and the accompanying drawings. Similar components are denoted by the same reference numerals in the drawings. Those skilled in the art should understand that the specific description below is illustrative rather than limiting, and should not limit the protection scope of the present application.

[0041] Example 1

[0042] The preparation of the fluorescent material includes the following steps:

[0043] (1) Select PET as the base material, ready for use;

[0044] (2) Take 121.4 grams of barium carbonate, 104.1 grams of barium fluoride, 86 grams of ammonium bromide, 14.3 grams of ammonium iodide, and 1.45 grams of europium oxide, and mix them together;

[0045] (3) Put into a crucible, under a 5%-10% H2 atmosphere, set the temperature to 400°C, calcine for 4 hours, continue to heat to 900°C, calcine for 4 hours, to obtain a fluorescent material (Eu-doped barium iodide fluoride), and take it out for use. Ball mill the fluorescent powder for 4 hours (ball mill frequency is 45 Hz), to obtain a powder with a particle size of about 2 microns.

[0046] The application of the above fluorescent material in the preparation of an X-ray dental imaging device includes the following steps:

[0047] 1) Take 4 grams of PVB and dissolve it in butanone, take 60 grams of the above fluorescent material, add a leveling agent, a defoaming agent, etc., and ball mill for 4 hours to obtain a coating liquid, and take it out for use;

[0048] 2) Uniformly coat the above-prepared coating liquid on the PET substrate, naturally dry it, and the obtained film layer has a thickness of 120 microns, apply a protective film layer on its surface, cut it, and then test its performance.

[0049] Example 2

[0050] The experimental process refers to Example 1, except that the europium oxide salt is changed to cerium oxide, and the other parameters remain the same as in Example 1. The thickness of the obtained film layer is 120 microns.

[0051] Example 3

[0052] The experimental process refers to Example 1, except that 4 grams of PVB is changed to 10.6 grams, and the other parameters remain the same as in Example 1. The thickness of the obtained film layer is 120 microns.

[0053] Example 4

[0054] The experimental process refers to Example 1, except that in step (2), no ammonium iodide is added, and the other parameters remain the same as in Example 1.

[0055] Example 5

[0056] The experimental process refers to Example 1, except that PVB is replaced by polyvinylidene fluoride, and the other parameters remain the same as in Example 1.

[0057] Comparative Example 1

[0058] The experimental process refers to Example 1, except that no rare earth oxide is added, and the other parameters remain the same as in Example 1.

[0059] The fluorescent powder does not emit light under X-ray.

[0060] Comparative Example 2

[0061] The experimental process refers to Example 1, except that the fluorescent powder is not ball milled after calcination, and the particle size is 6-10 microns. It is tested that the imaging noise is larger.

[0062] Comparative Example 3

[0063] The experimental process refers to Example 1, except that 2 grams of PVB is substituted for 4 grams of PVB. It cannot be well film-formed on the substrate with the fluorescent powder, so that X-ray imaging cannot be performed.

[0064] Experimental Example 1

[0065] The imaging device prepared in Example 1 is subjected to performance testing, and the testing method is as follows: using X-ray to take a photograph, placing a resolution template on the imaging device, taking a photograph for 0.32 seconds, reading the image with a card reader, and processing with Imaging J image processing software, Figure 1 In the figure, a is an X-ray imaging resolution map, b is an X-ray imaging resolution map of a local area in a after magnification, and c is a curve diagram of the line part in b obtained by processing the resolution map with Imaging J. It can be seen from the figure that the resolution reaches 10 lp / mm, and the gray scale is 252. Further, the imaging resolution of other examples and comparative examples is tested by using this method, and it is known that: the imaging resolution of Example 2 reaches 8 lp / mm, and the gray scale is 108; the imaging resolution of Example 3 reaches 10 lp / mm, and the gray scale is 241; the imaging resolution of Example 4 reaches 10 lp / mm, and the gray scale is 189; the imaging resolution of Example 5 reaches 5 lp / mm, and the gray scale is 94; and the imaging resolution of Comparative Example 2 reaches 5 lp / mm.

[0066] Figure 2 The schematic diagram of the tooth effect of Example 1 is shown, and the fine structure of the tooth can be clearly seen from the figure, indicating that the dental IP imaging plate can perform tooth imaging, and the actual comparison determines that the tooth imaging accuracy of the IP imaging plate is good. The schemes of Example 2 and Example 3 can also achieve similar effects.

[0067] Obviously, the above examples of the present application are only examples for clearly illustrating the present application, and are not limitations on the embodiments of the present application. For ordinary skilled persons in the art, other different forms of changes or variations can be made on the basis of the above description, and it is impossible to enumerate all the embodiments here. Any obvious changes or variations derived from the technical solutions of the present application still fall within the protection scope of the present application.

Claims

1. Use of a fluorescent material in the production of an X-ray dental imaging device, characterized in that, The application relates to a method for preparing an X-ray dental imaging device, which comprises the following steps: a fluorescent material is doped in a film-forming resin to obtain a film, and the film is used for preparing the X-ray dental imaging device. The fluorescent material is a rare earth element-doped alkali earth metal halide. The mass ratio of the fluorescent material to the film-forming resin is 5.5-15:

1. The film-forming resin is polyvinyl butyral. The rare earth element-doped alkali earth metal halide is europium-doped barium iodobromide fluoride. The application comprises the following steps: The fluorescent material and the film-forming resin are mixed to form a suspension, and an additive is added to obtain a coating liquid; The coating liquid is applied on a substrate to form a film.

2. Use according to claim 1, characterized in that, The fluorescent material is in a granular form, and the particle size is 1-5 microns.

3. Use according to claim 1, characterized in that, The thickness of the film is 100-200 microns.

4. Use according to claim 1, characterized in that, The preparation of the europium-doped barium iodobromide fluoride comprises the following steps: Barium carbonate, barium fluoride, ammonium bromide, ammonium iodide and europium oxide are uniformly mixed, calcined and mechanically ball milled to obtain the europium-doped barium iodobromide fluoride. The total mass percentage of the raw materials is as follows: Barium carbonate 30-38wt%, barium fluoride 30-35wt%, ammonium bromide 25-30wt%, ammonium iodide 1-5wt% and europium oxide 0.1-1wt%; The calcination temperature is 300-1000 DEG C, and the time is 5-10h.

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