阅读说明：本技术 一种开缝分段无级可调的准直器 (Slotting segmented stepless adjustable collimator ) 是由 方伟峰 王瑶法 王林 潘险峰 于 2019-10-10 设计创作，主要内容包括：本发明涉及CT设备制造技术领域,尤其涉及一种开缝分段无级可调的准直器,包括底座,底座上滑动连接有两个支座,支座上设有多个闸板,两个支座上的闸板之间形成开缝；所述闸板上连有连接板,连接板上连有随动器,底座的两侧连有固定板,连接板与固定板之间连有弹簧,支座远离开缝的一侧设有与底座转动连接的偏心轴,偏心轴上设有偏心轮,底座上设有驱动部；优点在于：通过两个电机带动两根偏心轴转动,来驱动多个闸板实现无级调节开缝尺寸,闸板上设有与偏心轮紧贴的随动器,当扫描层厚不同时,单侧的闸板开缝曲线可以分段无级调节彼此之间的角度位置,实现开缝曲线的曲率可调,大大缩小了无效的开缝区域,满足了不同层厚需求。(The invention relates to the technical field of CT equipment manufacturing, in particular to a slotted sectional stepless adjustable collimator which comprises a base, wherein two supports are connected to the base in a sliding manner, a plurality of flashboards are arranged on the supports, and a slot is formed between the flashboards on the two supports; the flashboard is connected with a connecting plate, the connecting plate is connected with a follower, the two sides of the base are connected with fixed plates, a spring is connected between the connecting plate and the fixed plates, one side of the support far away from the slit is provided with an eccentric shaft which is rotationally connected with the base, the eccentric shaft is provided with an eccentric wheel, and the base is provided with a driving part; has the advantages that: two eccentric shafts are driven to rotate by the two motors to drive the plurality of gate plates to realize stepless adjustment of the slotting size, followers tightly attached to the eccentric wheels are arranged on the gate plates, when the scanning layer thickness is different, the slotting curve of the gate plates on one side can be used for carrying out sectional stepless adjustment on the angle position between the two gate plates, the curvature of the slotting curve can be adjusted, the invalid slotting region is greatly reduced, and the requirements of different layer thicknesses are met.)

1. The utility model provides a stepless adjustable collimater of segmentation that cracks, includes the base, sliding connection has two supports of relative setting on the base, its characterized in that: the support is provided with a plurality of flashboards distributed along the length direction of the support, two adjacent flashboards are connected with the support through a pin shaft, and a slot is formed between the flashboards on the two supports; the gate plate is connected with a connecting plate, the connecting plate is connected with a follower, the two sides of the base are connected with fixing plates, a spring is connected between the connecting plate and the fixing plates, one side, far away from the slit, of the support is provided with an eccentric shaft which is rotatably connected with the base, the eccentric shaft is provided with an eccentric wheel which is tightly attached to the follower, and the base is provided with a driving part which is used for driving the eccentric shaft to rotate.

2. The slotted, segmented, stepless, adjustable collimator of claim 1, wherein: the driving part comprises a motor, and the output end of the motor is connected with a coupler connected with an eccentric shaft.

3. The slotted, segmented, stepless, adjustable collimator of claim 1, wherein: slide holes are formed in the two ends of the support, and slide rods with the two ends connected with the side wall of the base penetrate between the two opposite slide holes on the two supports.

Technical Field

The invention relates to the technical field of CT equipment manufacturing, in particular to a slotted sectional stepless adjustable collimator.

Background

ct (computed tomography), which is a product of combining the recent rapidly developed electronic computer control technology and X-ray image examination technology, is an indispensable device in medical diagnosis. As shown in fig. 1, X-rays emitted from a bulb of a CT system pass through a collimator to shield the redundant X-rays, pass through a human body, and are absorbed by a detector, and the detector converts the absorbed X-rays into electrical signals to generate an image.

In order to improve the dose utilization rate of X-rays during scanning, different collimator slits are required according to different scanning layer thicknesses, and the slits with different layer thicknesses are in an XY plane (the XY plane can refer to fig. 1), and the curvatures of slit curves are different, as shown in fig. 2, when the scanning layer thickness is smaller, the curvature of the required slit curve is smaller, and when the scanning layer thickness is larger, the curvature of the required slit curve is larger.

Disclosure of Invention

In order to solve the above problems, the present invention provides a slit sectional stepless adjustable collimator, which utilizes a sectional slit curve to adjust the curvature to reduce the ineffective slit area, improve the utilization rate of the dose, and keep the processing cost low.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a slotting segmented stepless adjustable collimator comprises a base, wherein two opposite supports are connected to the base in a sliding mode, a plurality of flashboards distributed along the length direction of the supports are arranged on the supports, two adjacent flashboards are connected with the supports through pin shafts, and a slot is formed between the flashboards on the two supports; the gate plate is connected with a connecting plate, the connecting plate is connected with a follower, the two sides of the base are connected with fixing plates, a spring is connected between the connecting plate and the fixing plates, one side, far away from the slit, of the support is provided with an eccentric shaft which is rotatably connected with the base, the eccentric shaft is provided with an eccentric wheel which is tightly attached to the follower, and the base is provided with a driving part which is used for driving the eccentric shaft to rotate.

Further, the driving part comprises a motor, and the output end of the motor is connected with a coupler connected with the eccentric shaft.

furthermore, slide holes are formed in the two ends of the support, and slide rods with two ends connected with the side wall of the base penetrate between the two opposite slide holes on the two supports.

The invention has the advantages that: two eccentric shafts are driven to rotate by two motors to drive the plurality of gate plates to realize stepless regulation of the slotting size, the eccentric wheels are arranged on the eccentric shafts, followers attached to the eccentric wheels are arranged on the gate plates, when the scanning layer thickness is different, the slotting curve of the gate plate on one side can be used for carrying out sectional stepless regulation on the angle position between the slotting curve and the eccentric wheels, the curvature of the slotting curve is adjustable, the invalid slotting region is greatly reduced, the requirements of different layer thicknesses are met, the dosage utilization rate is improved, the production cost is low, and the occupied space is small.

Drawings

FIG. 1 is a schematic diagram of CT imaging geometry;

FIG. 2 is a graph illustrating the required slit curves for different scan layer thicknesses;

FIG. 3 is a schematic diagram of an invalid slotted region integrated with a slotted curve based on a large slot;

FIG. 4 is a schematic diagram of an invalid slotted region integrated with a slotted curve based on a small slot;

FIG. 5 is a schematic view showing the construction of the present invention in the embodiment;

FIG. 6 is a schematic view of a single-sided slot-opening curve mechanism of FIG. 5;

FIG. 7 is a schematic view of a pin connection between two adjacent shutters and a support;

FIG. 8 is a schematic view of a non-active slit region with a slit curve segmented based on a large slit;

FIG. 9 is a schematic view of a slotted curve segmented invalid slotted region based on a small slot;

Description of reference numerals:

the device comprises a base 1, a support 2, a middle gate plate 3, an eccentric shaft 4, an eccentric wheel 5, a slide rod 6, a follower 7, a motor 8, a coupling 9, a connecting plate 10, a fixing plate 11, a side gate plate 12, a spring 13 and a slide hole 14.

Detailed Description

the present invention will be described in further detail with reference to examples.

The embodiment provides a slotted sectional stepless adjustable collimator, as shown in fig. 5 to 7, which includes a base 1, two oppositely arranged supports 2 are slidably connected to the base 1, a plurality of shutters distributed along the length direction of the supports 2 are arranged on the supports 2, two adjacent shutters are connected to the supports 2 through a pin, and a slot is formed between the shutters on the two supports 2; the gate plate is connected with a connecting plate 10, the connecting plate 10 is connected with a follower 7, two sides of the base 1 are connected with fixing plates 11, a spring 13 is connected between the connecting plate 10 and the fixing plates 11, one side, far away from the slit, of the support 2 is provided with an eccentric shaft 4 which is rotatably connected with the base 1, the eccentric shaft 4 is provided with an eccentric wheel 5 which is tightly attached to the follower 7, the base 1 is provided with a driving part which is used for driving the eccentric shaft 4 to rotate, the driving part comprises a motor 8, and the output end of the motor 8 is connected with a coupler 9 which is connected with. The sliding connection between the support 2 and the base 1 is arranged as follows: two ends of the support 2 are provided with slide holes 14, and a slide bar 6 with two ends connected with the side wall of the base 1 penetrates between two opposite slide holes 14 on the two supports 2.

preferably, the gate plate on each support 2 in the embodiment comprises a middle gate plate 3 located in the middle and side gate plates 12 located on two sides of the middle gate plate 3, and a common connection point of the middle gate plate 3 and the side gate plates 12 is connected with the support 2 through a pin shaft; the number of the followers 7 on the middle gate plate 3 is two, the number of the followers 7 on the side gate plate 12 is one, the followers 7 on the side gate plate 12 are positioned at one end of the side gate plate 12 far away from the middle gate plate 3, the eccentric wheels 5 on the eccentric shaft 4 correspond to the followers 7 on the gate plate one by one, the size and the eccentricity value of the eccentric wheels 5 positioned at two sides of the eccentric shaft 4 are different from the size and the eccentricity value 4 of the two eccentric wheels 5 in the middle, the design enables the middle gate plate 3 to translate along the width direction of the base 1, and the stepless adjustment of the size of the slot (the sliding connection between the support 2 and the base 1 is realized, so that the requirement that the middle gate plate 3 can translate along the width direction of the base 1) is met, and the relative angle between the side gate plate 12 and the middle gate plate 3 can be changed while the middle.

The working principle of this embodiment is as follows: the motor 8 drives the eccentric shaft 4 to rotate through the shaft coupling 9, the eccentric wheel 5 on the eccentric shaft 4 rotates due to the rotation of the eccentric shaft 4, when the eccentric wheel 5 rotates, the follower 7 can rotate, rolling friction is generated between the eccentric wheel 5 and the follower 7, the two supports 2 are enabled to be slotted to form different sizes and curvatures, and the springs 13 are arranged to provide the force for keeping contact between the follower 7 and the eccentric wheel 5 all the time. As shown in fig. 8 and 9, fig. 8 uses the curve of large slit as the design reference, and when the slit is reduced, the ineffective slit region exists, but is greatly reduced compared with fig. 3 in the prior art, and fig. 9 uses the curve of small slit as the design reference, and when the slit is increased, the ineffective slit region exists, but is also greatly reduced compared with fig. 4 in the prior art, and through the design of step-by-step stepless adjustment, the requirements of different scanning layer thicknesses are met, and the utilization rate of the dose is improved.