CN209826753U - A CBCT filter automatic adjustment device - Google Patents

Abstract

The utility model overcomes the deficiencies in the prior art and provides an automatic adjustment device for a CBCT filter, which is fully automatic, precise in operation and good in imaging effect; the adopted technical scheme is: an automatic adjustment device for a CBCT filter , including a box body and a filter plate, the box body is a fully enclosed structure, and a plurality of long holes are arranged horizontally on the upper plate of the box body, a plurality of the filter plates are vertically arranged in the box body, and are directly above the The long holes correspond one by one. The filter plates are used to absorb low-energy X-rays and suppress X-ray scattering. Each filter plate is provided with a lifting mechanism at the bottom, and the lifting mechanism is fixed in the box. Through the The lifting mechanism can lift the corresponding filter plate out of the long hole for filtering X-rays; the utility model can be widely used in the field of radiographic images.

Description

A CBCT filter automatic adjustment device

technical field

The utility model relates to an automatic adjustment device for a CBCT line filter, which belongs to the technical field of radiation images.

Background technique

Cone beam CT (hereinafter referred to as CBCT) is an important X-ray imaging technology, which can provide 2D and 3D images with clear details, and is cheaper than conventional fan beam CT. Wide range of applications. CBCT usually consists of three parts: a high-voltage module, a ray generator, and a detection board. The X-ray source used in CBCT is a broad-spectrum ray source, and its ray energy has a certain width range from low to high. The attenuation of rays of different energies in the medium is different, and the attenuation of high-energy rays is small, and the attenuation of low-energy rays is large. Because rays of different energies in a beam of rays have different attenuation and absorption in the medium, artifacts appear in the generated image, that is, X-ray hardening artifacts. So usually a CBCT system will use a line filter device between the ray generator and the target imaging object (usually a patient) to absorb low-energy rays and suppress scatter. Usually a CBCT system will be equipped with several filters of fixed thickness. When imaging different parts of the head, chest, abdomen, etc., filters of different thicknesses and shapes are often used. At present, the filters of most CBCT systems are manually switched, that is, according to the parts that need to be irradiated for imaging, the filters of different thicknesses and shapes are manually selected and used.

Current line filter arrangements in CBCT systems have their corresponding disadvantages. The main main manifestations are:

1. The operation is cumbersome and the operation time is long, which increases the workload of the operator;

2. When irradiating and imaging different parts, it can only be adjusted by replacing the filter or changing the position of the filter. For specific patients, the adjustment range is limited and cannot reach the best state.

Utility model content

The utility model overcomes the shortcomings of the prior art and provides an automatic adjustment device for a CBCT filter, which is fully automatic, precise in operation and good in imaging effect.

In order to solve the above technical problems, the technical solution adopted by the utility model is: a CBCT filter automatic adjustment device, including a box body and a filter plate, the box body is a fully enclosed structure, and the upper plate of the box body is horizontally A plurality of long holes are provided, and a plurality of the filter plates are vertically arranged in the box, and correspond to the long holes directly above, and the filter plates are used to absorb low-energy X-rays and suppress X-ray scattering. The bottom of the filter plate is provided with a lifting mechanism, and the lifting mechanism is fixedly arranged in the box, and the corresponding filter plate can be lifted out of the long hole by the lifting mechanism to filter X-rays.

The structure of the lifting mechanism includes a motor, a driving gear, a driven gear and a leading screw, the motor is vertically arranged at the inner bottom of the casing, and the output shaft of the motor is on the top, and the output shaft of the motor is on the A driving gear is provided, the driven gear and the driving gear mesh with each other, the lead screw is vertically arranged on the lower side of the filter plate, and the upper end of the lead screw and the lower side of the filter plate are connected together by screws, the The driven gear is movably sleeved on the lead screw, and the driven gear is provided with gear teeth meshing with the lead screw, and the filter plate is driven up and down by the motor driving the lead screw.

A rubber pad is provided at the lower end of the lead screw, and the rubber pad is used to limit the rising height of the lead screw.

The thickness, size and shape of the multiple filter plates can be equal or unequal.

Multiple lifting mechanisms work independently of each other, so that multiple filter plates can be lifted and lowered at the same time, or any combination of them can be lifted to ensure that the total thickness of the filter plates can be selected in a wider range, and the adjustment of the ray energy spectrum is more delicate, and the imaging The quality is better and more in line with actual clinical needs.

Compared with the prior art, the utility model has the beneficial effects that: the utility model is fully automatic, fast, and does not need to be manually replaced by an operator, which saves time and eliminates the possibility of manual misoperation. And anatomical structure, better adjustment of the thickness and position of the filter, better suppression of scattered rays, better imaging effect.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is described further.

Fig. 1 is the structural representation of the utility model.

Fig. 2 is the working schematic diagram of the utility model.

Among the figure: 1 is a box, 2 is a filter plate, 3 is a slotted hole, 4 is a lifting mechanism, 41 is a motor, 42 is a driving gear, 43 is a driven gear, 44 is a leading screw, and 45 is a rubber pad.

Detailed ways

As shown in Figure 1 and Figure 2, a CBCT filter automatic adjustment device of the utility model includes a box body 1 and a filter plate 2, the box body 1 is a fully enclosed structure, and the upper plate of the box body 1 A plurality of long holes 3 are arranged horizontally, and a plurality of the filter plates 2 are vertically arranged in the box body 1 and correspond to the long holes 3 directly above, and the filter plates 2 are used to absorb low-energy X-rays and suppress X-ray scattering, the bottom of each filter plate 2 is provided with a lifting mechanism 4, and the lifting mechanism 4 is fixedly arranged in the box body 1, and the corresponding filter plate 2 can be lifted from the length by the lifting mechanism 4 Hole 3 is lifted out to filter X-rays.

The structure of the lifting mechanism 4 includes a motor 41, a driving gear 42, a driven gear 43 and a lead screw 44, the motor 41 is vertically arranged on the inner bottom of the casing 1, and the output shaft of the motor 41 is upward , the output shaft of the motor 41 is provided with a driving gear 42, the driven gear 43 meshes with the driving gear 42, the lead screw 44 is vertically arranged on the lower side of the filter plate 2, and the lead screw 44 The upper end and the lower side of the filter plate 42 are connected together by screws, the driven gear 43 is movably sleeved on the lead screw 44, and the driven gear 43 is provided with gear teeth meshed with the lead screw 44, and the motor 41 drives the lead screw 44 to drive the filter plate 2 to lift.

A rubber pad 45 is provided at the lower end of the lead screw 44 , and the rubber pad 45 is used to limit the rising height of the lead screw 44 .

The thickness, size and shape of the plurality of filter plates 2 may be equal or unequal.

A plurality of the lifting mechanisms 4 work independently of each other, so that a plurality of the filter plates 2 can be lifted and lowered at the same time, or any combination of several can be lifted and lowered. It is ensured that the selection range of the total thickness of the filter plate 2 is wider, the adjustment of the ray energy spectrum is more delicate, the imaging quality is better, and it is more in line with actual clinical needs.

The utility model is an automatic adjustment device for a wire filter. The whole is a box-cassette structure with a multi-layer structure inside. A piece of wire filter is installed on each layer. The thickness and shape of the wire filter in each layer can be set according to actual needs. , and each layer of filter can be automatically ejected or retracted. When the line filters of all layers are ejected, the total thickness of the line filters is the largest, and the filtered low-energy rays are the largest. When the line filters of all layers are retracted, the total thickness of the line filters is the smallest, and the low-energy rays filtered are the least. According to the actual needs during use, each layer of filter can be set and combined, so that the selection range of the total thickness of the filter is more, the adjustment of the ray energy spectrum is more delicate, the imaging quality is better, and it is more in line with the actual clinical needs .

The above embodiments of the utility model have been described in detail in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned embodiments. Make various changes below.

Claims (5)

1. A CBCT filter automatic adjustment device, characterized in that it includes a box (1) and a filter plate (2), the box (1) is a fully enclosed structure, and on the top of the box (1) A plurality of long holes (3) are arranged horizontally on the plate, and a plurality of the filter plates (2) are vertically arranged in the box body (1), and correspond to the long holes (3) directly above, and the filter plates (2) The plates (2) are used to absorb low-energy X-rays and suppress X-ray scattering, and each filter plate (2) is provided with a lifting mechanism (4) at the bottom, and the lifting mechanism (4) is fixed on the box ( 1), through the lifting mechanism (4), the corresponding filter plate (2) can be lifted out of the long hole (3) for filtering X-rays. 2. A CBCT filter automatic adjustment device according to claim 1, characterized in that the structure of the lifting mechanism (4) includes a motor (41), a driving gear (42), a driven gear (43 ) and lead screw (44), the motor (41) is vertically arranged on the inner bottom of the box (1), and the output shaft of the motor (41) is upward, and the output shaft of the motor (41) is A driving gear (42) is provided, the driven gear (43) meshes with the driving gear (42), the lead screw (44) is vertically arranged on the lower side of the filter plate (2), and the lead screw ( The upper end of 44) and the lower side of the filter plate (2) are connected together by screws, the driven gear (43) is movably fitted on the lead screw (44), and the driven gear (43) is provided with The meshed gear teeth of the lead screw (44) drive the lead screw (44) through the motor (41) to drive the filter plate (2) to lift. 3. A CBCT filter automatic adjustment device according to claim 2, characterized in that, the lower end of the lead screw (44) is provided with a rubber pad (45), and the rubber pad (45) is used to limit The rising height of the lead screw (44). 4. An automatic adjustment device for a CBCT line filter according to claim 3, characterized in that the thickness, size and shape of the plurality of filter plates (2) may be equal or unequal. 5. An automatic adjustment device for a CBCT filter according to claim 4, characterized in that a plurality of the lifting mechanisms (4) work independently of each other, so that a plurality of the filter plates (2) can be lifted and lowered at the same time , or any combination of lifts.