CN102495523A - Imaging plate (IP) cassette - Google Patents

Abstract

The invention discloses an image IP board cassette, comprising a box body and an image board arranged in the box body, the image board includes a protective layer, a fluorescent layer and a substrate, the fluorescent layer is coated on one side of the substrate, the protective layer and the fluorescent layer are coated The side of the substrate is superimposed, and it is characterized in that: a scattered ray filter layer is provided to be superimposed on the other side of the substrate, and the scattered ray filter layer is a lead plate; the thickness of the lead plate is 0.5-1.5 mm, preferably The thickness is 1mm. The present invention can effectively absorb rays by setting the lead plate of the scattering ray filter layer, and reduce the damage of scattered rays to the examinee and accompanying personnel; the lead plate can also absorb scattered rays, reduce the generation of secondary rays, make the image clear and make the Residual latent images are reduced and image definition is increased; the invention has simple structure, low cost and good protection effect.

Description

An image IP board cassette

technical field

The invention relates to medical equipment, in particular to a computer X-ray image IP board cassette.

Background technique

Computed radiography (CR) uses an imaging plate (IP) that can record X-ray imaging information as a carrier, reads X-ray imaging information by laser, and processes X-ray exposure and information readout to form Digitized plain film images. In the CR imaging system, the formation and preliminary storage of image information is completed using an image board (IP board). The image plate is a product in which barium fluorobromide crystals containing trace element europium are coated on a support. When X-rays penetrate the human body, due to the different absorption capabilities of the internal tissues of the human body for X-rays, the energy distribution of the penetrated rays is no longer uniform, but a specific distribution with human body structure information. At this time, the X-rays make the image The plate is sensitized and a latent image is formed.

The working principle of the image plate is: through the X-rays of human tissue, a two-dimensional distribution is generated on the surface of the image plate to capture electrons and holes that are proportional to the X-ray dose received at the point. The X-ray image is formed by electrons and holes. The distributed latent image is stored; then, the focused laser beam is used for X-Y line scanning on the surface of the image plate, and under the excitation of the laser beam, the trapped electrons and holes will be released to generate electron holes with the point Density-proportional fluorescence; fluorescence is received point by point, converted into time-sequential electrical signals, and then converted into digital signals by analog/digital conversion and entered into the computer for digital image processing, and finally the X-ray transmission image is displayed on the fluorescent screen. The fundamental mechanism is that traces of bivalent europium fluoride barium halide crystals have photoluminescent properties, that is, when the X-ray is excited for the first time, all the energy is stored, and when it is excited again, all the energy for the first time is released, and the image can be displayed by strong light irradiation The residual image after the plate energy is released is completely eliminated and the original characteristics are restored, which can be reused many times. The image plate cassette is a key component of computer radiography, mainly used to complete the projection exposure-image collection and excitation scanning-image reading process of computer radiography.

Image boards, such as the commercially available Nissan FUJI image board, include a protective layer, a fluorescent layer and a substrate. The protective layer is used to prevent the fluorescent layer from being damaged; the fluorescent layer is made of fluorescent substances mixed with polymer materials and coated on the substrate The main function of the substrate is to fix the fluorescent substance of the fluorescent layer; the protective layer is overlapped with the side of the substrate coated with the fluorescent layer, and the image plate is arranged in the cassette.

The factors affecting CR imaging by image plate include 1. Quantum noise of image plate; 2. Residual latent image of image plate; 3. Damage of image plate.

X-rays are electromagnetic waves with a wavelength of 0.0006-50nm. The wavelength used for X-ray imaging is 0.031-0.008nm (equivalent to 40-150KV). In electromagnetic waves, it is between γ-rays and ultraviolet rays. It is strong enough to ionize atoms and molecules.

In recent years, more and more attention has been paid to the radiation damage of X-rays received by subjects when they accept CR testing. For radiation sickness, the greater the absorbed dose, the more serious the radiation damage. When the total dose is the same, the damage of high dose rate is more obvious than that of low dose rate. Once X-rays enter the human body and are absorbed, the biological effects will cause radiation damage to the human body, and the degree of damage depends on the absorbed dose. Under normal circumstances, small doses are not enough to cause harm, but large doses or cumulative excessive doses can lead to tissue cell destruction and lesions in the blood circulation system. Due to the indifference of people's awareness of X-ray protection, the protection of the examinee is neglected, which leads to unnecessary radiation and even medical disputes for the examinee and his companions. The X-ray protection of the subjects has long been highly valued in the world. The incidence of malignant diseases and genetic diseases induced by ionizing radiation depends on the collective dose equivalent received by the subjects. If the body is continuously or intermittently exposed to X-rays for a long period of time and reaches a certain dose, the cells in the tissue will be inactivated by ionizing radiation, causing radiation damage. Detrimental effects can also appear in the long-term, so-called long-term effects. Radiation cataracts caused by rays are deterministic effects, which can occur after accumulation in the body to a certain extent. Random effects are likely to cause disease with a single exposure. The higher the exposure dose, the greater the probability of inducing disease. Radiation-induced cancer is a random effect. Radiation examination can cause damage to some body cells. When the immune system is weakened or cancerous factors exist, the damaged cells begin to reproduce cancerously and become cancerous lesions.

Existing CR systems have the disadvantages of large damage to the subject and the caregiver, more image residual latent images, and insufficient image clarity.

Contents of the invention

The purpose of the present invention is to address the shortcomings of the above-mentioned prior art, and to provide an image IP panel with less damage to the examinee and the accompanying person, less image residual latent image, higher image definition, simple structure and low cost. cassette.

The purpose of the present invention is achieved by the following technical solutions:

An image IP board cassette, including a box body and an image board arranged in the box body, the image board includes a protective layer, a fluorescent layer and a substrate, the fluorescent layer is coated on one side of the substrate, and the protective layer is connected to the substrate coated with the fluorescent layer. One side is laminated, and the difference from the prior art is that a scattered ray filter layer is provided to be laminated with the other side of the substrate, and the scattered ray filter layer is a lead plate.

The thickness of the lead plate is 0.5-1.5mm, preferably 1mm.

The present invention can effectively absorb rays by setting the lead plate of the scattering ray filter layer, and reduce the damage of scattered rays to the examinee and the accompanying staff; the lead plate can also absorb scattered rays, reduce the generation of secondary rays, and make the image clear and make the Residual latent images are reduced and image definition is increased; the invention has simple structure, low cost and good protection effect. the

Description of drawings

Fig. 1 is the structural representation of embodiment;

FIG. 2 is an exploded schematic diagram of FIG. 1 .

In the figure, 1. Box body 2. Protective layer 3. Fluorescent layer 4. Substrate 5. Scattering ray filter layer.

Detailed ways

The content of the present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited thereto.

Example:

With reference to Fig. 1 Fig. 2, a kind of image IP plate cassette, comprises box body 1 and the image plate that is arranged in box body 1, image plate comprises protective layer 2, fluorescent layer 3 and substrate 4, and fluorescent layer 3 is coated on the base plate 4 On one side, the protection layer 2 is overlapped with the substrate 4 coated with the fluorescent layer 3 , and a scattered ray filter layer 5 is overlapped with the other surface of the substrate 4 , and the scattered ray filter layer 5 is a lead plate.

The thickness of the lead plate is 0.5-1.5mm.

Specifically, DA0p010/50 lead plate made in Germany, with a thickness of 1mm, equivalent to 0.5MMpb lead equivalent, is used, and a domestic 500mA X-ray machine; Nissan FUJI imaging plate; Xi'an-made environmental grade X, γ dose rate meter; Chengdu-made 9206 dosimeter.

Put the lead plate of the same size as the inside of the cassette body 1 into the back side of the imaging plate, irradiate the X-ray machine from top to bottom, place the cassette flat on the examination table, focus-film distance 1m, 75Kv, 10MAS, adjust the grating The width is the same as the cassette size. The X and γ dose rate meters were randomly placed 1m and 3m away from the film box, respectively, and were exposed to the film box with and without lead plate for 3 times, and the average value was taken.

The tube adopts the horizontal projection method, the focal-film distance is 1m, 75Kv, 10MAS, adjust the width of the grating to be consistent with the size of the film box, and the 9206 dosimeter is directly facing the window of the tube through the cassette, and the distance is 1m, respectively for the cassette with and without lead plate Expose 3 times and take the average value.

Take photos of the subject's lumbar spine. The results showed that the thicker the tissue thickness, the higher the density. The image obtained with the diffuse filter is clearer than the image without the diffuse filter.

Table 1 shows the X, γ dose rate meter measurement results.

Table 1

It can be seen from Table 1 that there is a significant difference in the values measured at a distance of 3m between the lead plate and the lead-free plate, and the dose is reduced by 69.1%.

Table 2 shows the measurement results of the 9206 dosimeter.

Table 2

Lead-free board lead plate 0.0803cgy 0.0012 cgy

It can be seen from Table 2 that there is a significant difference in the direct radiation dose measured at 1m after the lead plate is installed.

It is well known that lead plates can effectively receive rays. Part of the rays that can be measured by dosimeters are actually scattered rays in the air and a very small amount of secondary rays, indicating that some harmful rays have been effectively absorbed by lead plates.

According to the results obtained in the above specific examples, the image quality of the lead plate provided with the scattering ray filter layer 5 is obviously better than that of the lead-free plate, the image resolution is high, the edge is sharp, the latent image is reduced, and the subtle results are displayed relatively clearly.

Proved by the above examples: the present invention mainly utilizes the increased scattered ray filter layer 5 lead plate to absorb scattered rays, reduce the generation of secondary rays, reduce the residual latent image of the image plate, and make the image clear; meanwhile, utilize the lead plate The principle of absorbing rays reduces the damage of radiation to the examinee and accompanying personnel, and also reduces the impact of scattered rays on the surrounding environment.

The lead plate used should be flat, complete, without deformation and holes, and the cutting should be of appropriate size. The thickness should not be less than 0.5mm. If the thickness is too thin, the effect of absorbing and filtering rays is not obvious; 1 Freedom is appropriate. The total weight of the cassette has increased after the lead plate is installed. When using it, care should be taken to avoid cracking and damage caused by falling or bumping and causing light leakage from the image plate.

This method is simple and easy to implement, has obvious practical and practical significance, and can be popularized and applied.

Claims (3)

1. An image IP plate cassette, comprising a box body and an image plate arranged in the box body, the image plate includes a protective layer, a fluorescent layer and a substrate, the fluorescent layer is coated on one side of the substrate, the protective layer and the substrate coated with the fluorescent layer The side of the substrate is superimposed, and it is characterized in that: a scattered ray filter layer is provided to be superimposed on the other side of the substrate, and the scattered ray filter layer is a lead plate. 2. The image IP board cassette according to claim 1, characterized in that: the thickness of the lead plate is 0.5-1.5 mm. 3. The image IP board cassette according to claim 1, wherein the thickness of the lead plate is 1mm.

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