Low-attenuation-rate reflector and beam limiting device

Abstract

The utility model provides a low attenuation rate reflector used for light field indication of a beam limiting device, the low attenuation rate reflector comprises a support structure and a lens, the support structure comprises an upper support member and a lower support member, the upper support member and the lower support member are detachably connected, the lens is arranged between the upper support member and the lower support member, and the lens is arranged between the upper support member and the lower support member. At least four fixing points are evenly arranged between the upper supporting piece and the lower supporting piece, the lens is fixed to the beam limiting device through a supporting structure and comprises a resin substrate and a reflecting layer arranged on the resin substrate, the resin substrate is used for reflecting visible light, and the reflecting layer is used for enhancing the reflection amount of the visible light. According to the low-attenuation-rate reflector, the imaging quality can be guaranteed, and meanwhile radiation damage to the human body can be reduced. The utility model also discloses a beam limiting device comprising the low-attenuation-rate reflector.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of beam limiter, in particular to a low attenuation rate reflector and beam limiter. BACKGROUND

[0002] Mammography is the most traditional breast imaging examination method, after a century of development, has become the effective and feasible imaging examination method of early detection, early diagnosis of breast cancer, is widely used in the screening and diagnosis of breast cancer. In the past few decades, mammography technology has undergone great changes from breast dry plate X-ray photography, special screen-film photography (film-screen mammography) to the current full field digital mammography (full-field digital mammography, FFDM), the image quality is continuously improved while the radiation dose is significantly reduced.

[0003] The same as ordinary X-ray photography, the imaging basis of mammography is the density difference of the tissues constituting the breast, and the essence is that the absorption values of each tissue to X-ray are different. The breast itself is a soft tissue component, mainly composed of fibrous glandular tissue, fat tissue and skin, and the tissue density and linear absorption coefficient are very close. Therefore, the X-ray generated by mammography has a unique property, that is, it is a low-energy soft X-ray, which can expand the X-ray absorption difference between breast tissues and enhance the contrast of the image. The current mainstream reflector used by the beam limiter adopts glass material + aluminizing process, however, the attenuation rate of the glass material mirror is high, which has a great impact on the radiation dose. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a low attenuation rate reflector and beam limiter.

[0005] To achieve the above-mentioned purpose and other related purposes, the utility model provides a low attenuation rate reflector for light field indication of a beam limiter, which comprises a support structure and a mirror, the support structure comprises an upper support and a lower support, the upper support and the lower support are detachably connected, the mirror is arranged between the upper support and the lower support, at least four fixing points are uniformly arranged between the upper support and the lower support, the mirror is fixed to the beam limiter through the support structure, the mirror comprises a resin substrate and a reflective layer arranged on the resin substrate, the resin substrate is used for reflecting visible light, and the reflective layer is used for enhancing the reflection amount of visible light.

[0006] Preferably, the thickness of the resin substrate is 0.06mm-0.08mm.

[0007] Preferably, the reflective layer is an aluminum layer or a silver layer.

[0008] Preferably, the reflecting layer is arranged on one side of the resin substrate.

[0009] Preferably, the thickness of the reflecting layer is 0.08-0.1 μm.

[0010] Preferably, the resin substrate is polyethylene terephthalate.

[0011] Preferably, the support structure is a frame structure.

[0012] Preferably, the upper support member and the lower support member are each provided with two lugs arranged oppositely, and the two lugs of the upper support member and the two lugs of the lower support member correspond to each other one by one, and the lugs are used for supporting the support structure.

[0013] A beam limiter comprising the low attenuation rate mirror as described above.

[0014] As described above, the low attenuation rate mirror of the present application has the following advantages: the resin substrate has the characteristic of low attenuation rate, when the X-ray passes through the resin substrate, the resin substrate has weak effect on the intensity and energy reduction of the X-ray, which can effectively avoid increasing the radiation dose and reducing the radiation damage to the patient, and meanwhile the resin substrate can ensure the image quality. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 Fig. 1 shows a schematic view of the low attenuation rate mirror of the present application.

[0016] EXPLANATION OF COMPONENT NUMERALS

[0017] 1, lens; 2, upper support member; 3, lower support member; 4, bolt; 5, lug. DETAILED DESCRIPTION

[0018] The embodiments of the present application will be described in detail with specific examples. Those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. The present application can also be implemented or applied in different specific embodiments, and the details in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application.

[0019] Please refer to Figure 1 It should be noted that the drawings provided in the embodiments only schematically illustrate the basic concept of the present application, and the drawings only show the components related to the present application, not the number, shape and size of the components in actual implementation. The shape, number and proportion of the components in actual implementation can be randomly changed, and the layout pattern of the components can be more complex.

[0020] The embodiment provides a low-attenuation-rate mirror in a beam limiter matched with a breast X-ray machine, the low-attenuation-rate mirror comprising a support structure and a mirror piece 1, the mirror piece 1 being arranged on the support structure and fixed in the beam limiter through the support structure. The support structure supports the mirror piece 1, in order to ensure that the support structure is not easy to deform after installation, the support structure is preferably made of a material with high hardness, for example, a metal material, and the specific metal material can be selected according to actual application, which is not limited here. Since the support structure is made of a material with high hardness and is not easy to deform, the installation of the mirror piece 1 is not easy to change, and the accuracy of the light field indication is improved.

[0021] The support structure comprises an upper support piece 2 and a lower support piece 3, the upper support piece 2 and the lower support piece 3 are detachably connected, the mirror piece 1 is arranged between the upper support piece 2 and the lower support piece 3, and the mirror piece 1 is tightly fixed by the upper support piece 2 and the lower support piece 3.

[0022] For example, the upper support piece 2 and the lower support piece 3 are fixed through bolts 4, and the bolts 4 are used for fastening, which is simple to disassemble and assemble and convenient to operate. Since the mirror piece 1 is thin, it is easy to wrinkle when fixed by using the support structure, in order to keep the mirror piece 1 flat, at least four fixing points are arranged between the upper support piece 2 and the lower support piece 3, that is, one bolt 4 is arranged at each of the four end corners of the upper support piece 2 and the lower support piece 3, and in the embodiment, a plurality of bolts 4 are uniformly arranged on each side frame of the upper support piece 2 and the lower support piece 3. Since the number of fixing points on the upper support piece 2 and the lower support piece 3 is large, the fixing effect of the mirror piece 1 is better.

[0023] The mirror piece 1 comprises a resin substrate and a reflection layer arranged on the resin substrate, the resin substrate is fixed on the support structure, the resin substrate is used for reflecting visible light to indicate a light field, and the reflection layer is used for enhancing the reflection amount of the visible light, so that the imaging is clearer.

[0024] In the embodiment, the resin substrate is made of PET, that is, polyethylene terephthalate, and by using a resin material as the substrate, the thickness of the mirror piece 1 can be reduced. The traditional mirror is made of glass, and the thickness is usually 0.8mm-15mm, while the thickness of the resin substrate in the embodiment can reach 0.06mm-0.08mm.

[0025] The resin substrate has a low attenuation rate, that is, the resin substrate has a weak cutting effect on the intensity and energy of X-rays. When a traditional reflector is used, the glass has a large blocking effect on X-rays when the X-rays pass through the glass reflector, so that the dose of the rays reaching the human body is small, which cannot meet the treatment requirements, and thus the ray machine needs to increase the dose of the rays. As the dose of the rays increases, the radiation damage to the human body is increased. When the resin substrate of the embodiment is used, the resin substrate has a weak cutting effect on the intensity and energy of X-rays when the X-rays pass through the resin substrate, which can effectively avoid increasing the dose of the rays and reduce the radiation damage to the patient. For example, when the traditional reflector is used, the inherent filtration of the beam limiter is 0.8-1.5mm@75kv, and when the resin substrate of the embodiment is used, the inherent filtration of the beam limiter is reduced to 0.006-0.01mmAl@75kv, so that the radiation dose of the patient during examination is greatly reduced, and the harm to the human body is reduced.

[0026] In the embodiment, the reflecting layer is arranged on one side of the resin substrate. When the lens 1 is installed in the beam limiter, the side provided with the reflecting layer faces the visible light source for reflecting the visible light. By arranging the reflecting layer on one side of the resin substrate, the processing cost of the lens 1 is reduced.

[0027] The reflecting layer is an aluminum layer or a silver layer, and the thickness of the reflecting layer is usually 0.08-0.1μm. In the embodiment, the reflecting layer is an aluminum layer.

[0028] In the embodiment, the supporting structure is a frame structure. Specifically, the upper supporting member 2 and the lower supporting member 3 are both square frames, and the lens 1 is arranged between the upper supporting member 2 and the lower supporting member 3. The middle part of the upper supporting member 2 and the lower supporting member 3 is a hollow structure for exposing the lens 1.

[0029] The upper supporting member 2 and the lower supporting member 3 are both provided with two lugs 5 arranged oppositely, and the two lugs 5 of the upper supporting member 2 and the two lugs 5 of the lower supporting member 3 correspond to each other. When the upper supporting member 2 and the lower supporting member 3 are installed together, the two lugs 5 of the upper supporting member 2 and the two lugs 5 of the lower supporting member 3 are aligned, and a hole structure is formed on each lug 5. The upper supporting member 2 and the lower supporting member 3 can be installed in the beam limiter through the lugs 5.

[0030] The embodiment also discloses a beam limiter comprising the low-attenuation-rate reflector.

[0031] In summary, the low attenuation rate reflector of the embodiment can be used in a mammography system and a system with low attenuation rate requirement of common DR; while ensuring image quality, the required radiation dose for examination can be reduced, and the X-ray harm to patients caused by examination can be reduced.

[0032] The above embodiment only exemplarily illustrates the principle and effect of the utility model, and is not used to limit the utility model. Any person skilled in the art can modify or change the above embodiment without departing from the spirit and category of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A low attenuation rate mirror for light field indication of a beam stop, characterized in that, The low attenuation rate mirror comprises a support structure and a lens, the support structure comprises an upper support and a lower support, the upper support and the lower support are detachably connected, the lens is arranged between the upper support and the lower support, at least four fixing points are uniformly arranged between the upper support and the lower support, the lens is fixed to the beam limiter through the support structure, the lens comprises a resin substrate and a reflection layer arranged on the resin substrate, the resin substrate is used for reflecting visible light, and the reflection layer is used for enhancing the reflection amount of visible light.

2. The low decay rate mirror of claim 1, wherein: The thickness of the resin substrate is 0.06mm-0.08mm.

3. The low decay rate mirror of claim 1, wherein: The reflection layer is an aluminum layer or a silver layer.

4. The low decay rate mirror of claim 1, wherein: The reflection layer is arranged on one side of the resin substrate.

5. The low decay rate mirror of claim 1, wherein: The thickness of the reflection layer is 0.08um-0.1um.

6. The low decay rate mirror of claim 1, wherein: The material of the resin substrate is polyethylene terephthalate.

7. The low decay rate mirror of claim 1, wherein: The support structure is a frame structure.

8. The low decay rate mirror of claim 1, wherein: The upper support and the lower support are each provided with two lugs arranged oppositely, the two lugs of the upper support and the two lugs of the lower support are one-to-one corresponding, and the lugs are used for supporting the support structure.

9. A beam stop, characterized by: The low attenuation rate mirror comprises any one of claims 1-8.

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