CN209826753U

CN209826753U - Automatic adjusting device of CBCT (cone beam computed tomography) line filter

Info

Publication number: CN209826753U
Application number: CN201920159784.0U
Authority: CN
Inventors: 张文山
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-01-30
Filing date: 2019-01-30
Publication date: 2019-12-24
Anticipated expiration: 2029-01-30

Abstract

The utility model overcomes the defects of the prior art, provides an automatic adjusting device of a CBCT (cone beam computed tomography) wire filter, and has the advantages of full-automatic operation, accurate operation and good imaging effect; the technical scheme is as follows: an automatic adjusting device of a CBCT (cone beam computed tomography) filter wire device comprises a box body and filter plates, wherein the box body is of a totally-enclosed structure, a plurality of long holes are transversely formed in an upper plate of the box body, the filter plates are vertically arranged in the box body and correspond to the long holes right above the box body one by one, the filter plates are used for absorbing low-energy X-rays and inhibiting scattering of the X-rays, a lifting mechanism is arranged at the bottom of each filter plate and fixedly arranged in the box body, and the corresponding filter plates can be lifted out of the long holes through the lifting mechanisms and are used for filtering the X-rays; the utility model discloses but wide application in radiological image field.

Description

Automatic adjusting device of CBCT (cone beam computed tomography) line filter

Technical Field

The utility model relates to a CBCT filter wire ware automatic regulating apparatus belongs to radiological image technical field.

Background

Cone Beam CT (CBCT) is an important X-ray imaging technique, can provide 2D and 3D images with clear details, is cheaper than conventional fan beam CT, and has wide application in the fields of oral diagnosis and radiotherapy image guidance. CBCT usually consists of three parts, namely a high voltage module, a ray generator and a detection plate. The X-ray source used in CBCT is a wide spectrum source with a range of widths from low to high ray energies. The attenuation of the rays with different energies in the medium is different, and the attenuation is specifically reduced for high-energy rays and is large for low-energy rays. Due to the different attenuation and absorption of rays of different energy in a beam in a medium, artifacts, i.e. X-ray hardening artifacts, appear in the generated image. CBCT systems typically employ a line filter device between the radiation generator and the object being imaged (typically a patient) to absorb low energy radiation and suppress scatter. Typically, CBCT systems are equipped with several fixed thickness wire filters. Filters of different thickness and shape are commonly used for imaging different parts of the head, chest, abdomen, etc. At present, the wire filters of most CBCT systems are manually switched, namely, the wire filters with different thicknesses and shapes are manually selected and used according to the positions to be irradiated and imaged.

The current filter assembly in CBCT systems has its associated disadvantages. The main manifestations are:

1. the operation is complicated, the operation time is long, and the workload of operators is increased;

2. when different parts are irradiated and imaged, the adjustment can be performed only by replacing the filter wire device or changing the position of the filter wire device, and the adjustment range is limited aiming at specific patients, so that the optimal state cannot be reached.

SUMMERY OF THE UTILITY MODEL

The utility model overcomes prior art exists not enough, provides a CBCT filter wire ware automatic regulating apparatus, full automatic operation, the operation is accurate, and it is effectual to form images.

In order to solve the technical problem, the utility model discloses a technical scheme be: the utility model provides a CBCT filter wire ware automatic regulating apparatus, includes box and filter, the box is totally enclosed structure, and transversely is provided with a plurality of slot holes on the upper plate of box, and is a plurality of the vertical setting of filter is in the box, and with the slot hole one-to-one directly over, the filter is used for absorbing low energy X ray and restraines the X ray scattering, every the filter bottom all is provided with lifting mechanism, lifting mechanism is fixed to be set up in the box, through lifting mechanism can go out the filter lifting in the slot hole that corresponds for filter the X ray.

The structure of lifting mechanism includes motor, driving gear, driven gear and lead screw, the vertical setting of motor is in the inboard bottom of box, just the output shaft of motor is upwards, be provided with the driving gear on the output shaft of motor, driven gear and driving gear intermeshing, the vertical setting of lead screw is at the filter downside, just the upper end of lead screw and the downside of filter pass through screwed connection together, driven gear activity suit is on the lead screw, just be provided with the teeth of a cogwheel with lead screw engaged with on the driven gear, drive the filter through the motor drive lead screw and go up and down.

The lower extreme of lead screw is provided with the cushion, the cushion is used for restricting the rise of lead screw.

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

The lifting mechanisms work independently, so that the filter plates can lift simultaneously or lift in any combination, the total thickness of the filter plates is ensured to be more, the adjustment of the ray energy spectrum is finer, the imaging quality is better, and the clinical practical requirements are met better.

Compared with the prior art, the utility model beneficial effect who has is: the utility model discloses a full automatic operation, it is fast, need not the manual change operation of operating personnel, save time eliminates the possibility of artifical maloperation, to specific position and the dissection structure of shining simultaneously, adjusts the thickness and the position of filter element better, and it is better to scattered ray suppression, and the formation of image effect is better.

Drawings

The present invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the operation of the present invention.

In the figure: 1 is a box body, 2 is a filter plate, 3 is a long hole, 4 is a lifting mechanism, 41 is a motor, 42 is a driving gear, 43 is a driven gear, 44 is a lead screw and 45 is a rubber cushion.

Detailed Description

As shown in fig. 1 and 2, the utility model relates to a CBCT filter wire ware automatic regulating apparatus, including box 1 and filter 2, box 1 is totally closed structure, and transversely is provided with a plurality of slot holes 3 on the upper plate of box 1, and is a plurality of the vertical setting of filter 2 is in box 1, and with the slot hole 3 one-to-one directly over, filter 2 is used for absorbing low energy X ray and restraines the X ray scattering, every 2 bottoms of filter all are provided with lifting mechanism 4, lifting mechanism 4 is fixed to be set up in box 1, through lifting mechanism 4 can go out the lifting of filter 2 follow slot hole 3 that corresponds for filter the X ray.

The lifting mechanism 4 structurally comprises a motor 41, a driving gear 42, a driven gear 43 and a lead screw 44, wherein the motor 41 is vertically arranged at the bottom of the inner side of the box body 1, the output shaft of the motor 41 faces upwards, the driving gear 42 is arranged on the output shaft of the motor 41, the driven gear 43 is meshed with the driving gear 42, the lead screw 44 is vertically arranged at the lower side of the filter plate 2, the upper end of the lead screw 44 is connected with the lower side of the filter plate 42 through screws, the driven gear 43 is movably sleeved on the lead screw 44, gear teeth meshed with the lead screw 44 are arranged on the driven gear 43, and the lead screw 44 is driven by the motor 41 to drive the filter plate 2 to lift.

The lower end of the screw 44 is provided with a rubber pad 45, and the rubber pad 45 is used for limiting the rising height of the screw 44.

The thickness, size and shape of a plurality of said filter plates 2 may or may not be equal.

The lifting mechanisms 4 work independently, so that the filter plates 2 can be lifted simultaneously or in any combination. The total thickness of the filter plate 2 is ensured to be selected in a wider range, the adjustment of the radiation energy spectrum is finer and smoother, the imaging quality is better, and the clinical practical requirements are better met.

The utility model discloses a strain line ware automatic regulating apparatus wholly is a box-type structure, establishes multilayer structure in, and a slice strain line ware is installed on every layer, and strain line ware thickness and shape in every layer can be set for according to the actual demand, but every layer of strain line ware auto-eject in addition perhaps withdraws. When the wire filters of all layers are ejected, the total thickness of the wire filters is the largest, and the filtered low-energy rays are the largest. When the wire filters of all layers are retracted, the total thickness of the wire filters is minimum, and the low-energy rays are filtered to be minimum. According to the actual demand during the use, can set for and make up each layer filter wire ware for filter wire ware gross thickness's selection range is more, and is more exquisite to the adjustment of ray energy spectrum, and the imaging quality is better, accords with clinical actual demand more.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims

1. The utility model provides a CBCT filter wire ware automatic regulating apparatus, its characterized in that, includes box (1) and filter (2), box (1) is totally closed structure, and transversely is provided with a plurality of slot holes (3) on the upper plate of box (1), and is a plurality of the vertical setting of filter (2) is in box (1), and with slot hole (3) one-to-one directly over, filter (2) are used for absorbing low energy X ray and restrain the X ray scattering, every filter (2) bottom all is provided with lifting mechanism (4), lifting mechanism (4) are fixed to be set up in box (1), through lifting mechanism (4) can go out lifting in slot hole (3) with filter (2) that correspond for filter the X ray.

2. The automatic adjustment device of CBCT filter wire device as claimed in claim 1, the lifting mechanism (4) structurally comprises a motor (41), a driving gear (42), a driven gear (43) and a screw rod (44), the motor (41) is vertically arranged at the bottom of the inner side of the box body (1), the output shaft of the motor (41) is upward, a driving gear (42) is arranged on the output shaft of the motor (41), the driven gear (43) is meshed with the driving gear (42), the lead screw (44) is vertically arranged at the lower side of the filter plate (2), the upper end of the screw rod (44) is connected with the lower side of the filter plate (2) through a screw, the driven gear (43) is movably sleeved on the screw rod (44), and the driven gear (43) is provided with gear teeth meshed with the screw rod (44), the motor (41) drives the lead screw (44) to drive the filter plate (2) to lift.

3. The automatic adjustment device for the CBCT wire filter as claimed in claim 2, wherein the lower end of the lead screw (44) is provided with a rubber pad (45), and the rubber pad (45) is used for limiting the rising height of the lead screw (44).

4. A CBCT filter wire automatic adjustment device according to claim 3, characterized in that the thickness and size and shape of a plurality of said filter plates (2) can be equal or unequal.

5. A CBCT filter wire automatic adjusting device as claimed in claim 4, wherein a plurality of the lifting mechanisms (4) work independently from each other, so that a plurality of the filter plates (2) can be lifted and lowered simultaneously, or any combination thereof.