CN104127198B

CN104127198B - A kind of preposition filter line device of CT

Info

Publication number: CN104127198B
Application number: CN201410326441.0A
Authority: CN
Inventors: 孙明山; 邢晓曼
Original assignee: Suzhou Institute of Biomedical Engineering and Technology of CAS
Current assignee: Suzhou Institute of Biomedical Engineering and Technology of CAS
Priority date: 2014-07-10
Filing date: 2014-07-10
Publication date: 2016-06-08
Anticipated expiration: 2034-07-10
Also published as: CN104127198A

Abstract

The present invention discloses a kind of preposition filter line device of CT, comprises body, parallel placement between described body and backboard, and described backboard has one piece or polylith, and described backboard is provided with slide rail, and described body can move around. Invention, by the design of removable module, changes the shape of preposition filter line device, thus ray density distribution is optimized adjustment, and by meticulousr adjustment gamma intensity, optimizes the data gathered, and reduces radiation dose suffered by patient; Novel filter line device is fixed and moves mode, thus ensures the reliable and stable of system, and convenient realization, save the time changing adjustment filter line device, thus reduce patient's waiting time.

Description

A kind of preposition filter line device of CT

Technical field

The present invention relates to a kind of filter line device, it is specifically related to a kind of preposition filter line device of CT.

Background technology

CT is the product that robot calculator combines with X-ray technique, can provide details clearly 2D, 3D rendering, and price is relatively cheap, doctor is made rapidly clinical diagnosis and provides a great help. But X-ray source used in CT is not all monochromatic source, but having the X-ray source of certain spectrum width, namely x-ray photon energy differs. Uptake factor reduces with the increase of X heat input, and this just means that high-energy photon decay is little, and lower energy photon decay is big, therefore produces " cup-shaped " artifact on image after reconstruction, and this kind of artifact is just called X line hardening artifact. Owing to X-ray beam hardening effect causes the inconsistent of data in X line projection, there is thick filaments of sun shadow in the middle of bone structure image in result. This depend on X-ray beam the density of tissue of process and thickness. For the near tissue of body part density and aqueous phase such as soft tissue, the impact of CT image can be compensated by this kind. But in high density area such as hip, shoulder, basis cranii etc., the region that strip artifact and CT value reduce is visible. The way solving this kind of artifact adopts to compensate filter line device or change reconstruction algorithm optimum configurations that these artifact effects reduce to make. Adopt reasonably filter line device that subsequent software process can be made more easy.

Preposition filter line device can also reach the imaging effect of the best by optimizing the distribution of X-ray intensity. Due to equally distributed X-ray by arriving detector after patient time no longer even, the signal that centre portions detects obviously is weaker than edge, the total quality of effect diagram picture; If the signal improving position, center will make the quantity of X-rays X of edge section increase, bring unnecessary skin dose to patient. In order to address this problem, it is possible to the shape of design filter line device so that edge gamma intensity is weaker than center, the gamma intensity being arrived detector by patient is comparatively even, thus improves the dynamicrange of detector.

Preposition filter line device also has great role for suppression ray scattering. Sector/taper ray produces a large amount of scattering at patient body's edge, causes unnecessary radiation dose, in order to reduce radiation injury, it is possible to weakens the gamma intensity of edge, thus reduces radiation dose.

Traditional CT preposition filter line device has its corresponding shortcoming, because the thickness change of its design is for specific die body, therefore when imaging object shape has change, often can only realize the adjustment to gamma intensity by changing filter line device or change the position filtering line device, adjusting range is very limited, than without more data-optimized when filter line device, can only can not reach the state of relative ideal.

Summary of the invention

It is an object of the invention to overcome prior art Problems existing, it is provided that the method for design of the preposition filter line device of a kind of CT.

For realizing above-mentioned technical purpose, reaching above-mentioned technique effect, the present invention is achieved through the following technical solutions:

A kind of preposition filter line device of CT, comprises body, parallel placement between described body and backboard, and described backboard has one piece or polylith, and described backboard is provided with slide rail.

Further, described body is split as the first removable module and the 2nd removable module, by changing described first removable module and the distance of described 2nd removable module, reaching the effect that the object to different width carries out ray density distribution adjustment, described first removable module and the 2nd removable module can two-ways regulation can also unidirectional regulate.

Further, described body is split as the 3rd removable module and the 4th removable module, and described 4th removable module is inverted, it is possible to adjust ray density distribution to a greater extent, described 3rd removable module and described 4th removable module can be overlapping, reach narrower ray window.

Further, independent filter line sheet is made up of by described body some, and often pair of filter line sheet can move left and right and be combined into various different filter line device shape, and described filter line sheet is right angle or circle; Circular filter line sheet makes formed thickness curve smoother, can reduce the artifact thus caused.

Further, described filter line device can adopt copper or aluminium tradition filter line device metal material to make, it is also possible to selects specific resin or the plastics of low density, it is also possible to adopt the mode that both combine.

Preferably, the specific resin of low density or plastics advantage are there is close X-ray absorption characteristic with water, and due to the increase of desired thickness size, can reduce mechanical movement equal error.

The useful effect of the present invention:

The present invention, by the design of removable module, changes the shape of preposition filter line device, thus ray density distribution is optimized adjustment, and by meticulousr adjustment gamma intensity, optimizes the data gathered, and reduces radiation dose suffered by patient; Novel filter line device is fixed and moves mode, thus ensures the reliable and stable of system, and convenient realization, save the time changing adjustment filter line device, thus reduce patient's waiting time.

Accompanying drawing explanation

Fig. 1 is the application schematic diagram in the background technology of the present invention;

Fig. 2 is that the traditional preposition CT in the background technology of the present invention filters line device schematic diagram, and left and right is respectively arc and Bowtie filters line device;

Fig. 3 is the ray density distribution schematic diagram after the traditional preposition CT in the background technology of the present invention filters line device position adjustment;

Fig. 4 is the schematic diagram that different imaging position adopts different shapes filter line device in the background technology of the present invention;

Fig. 5 (a) and Fig. 5 (b) is the schematic diagram (in figure, solid line body is mounting block, and dotted line body is displaceable member) of embodiments of the invention 1;

Fig. 6 is the schematic diagram (in figure, solid line body is mounting block, and dotted line body is displaceable member) of embodiments of the invention 2;

Fig. 7 is the schematic diagram of embodiments of the invention 3;

Fig. 8 is the installation structural representation of the filter line device module of the present invention.

Number in the figure illustrates: 1, body (filter line device module), the 1011, first removable module, the 1012, the 2nd removable module, the 1021, the 3rd removable module, the 1022, the 4th removable module, 2, backboard, 3, slide rail.

Embodiment

Below with reference to the accompanying drawings and in conjunction with the embodiments, the present invention is described in detail.

As shown in Figure 8, a kind of preposition filter line device of CT, comprises body 1, parallel placement between described body 1 and backboard 2, and described backboard 2 has one piece or polylith, and described backboard 2 is provided with slide rail 3.

Embodiment 1:

Such as Fig. 5 (a) and 5(b) shown in, splitting arc filter line device is two removable modules i.e. the first removable module 1011 and the 2nd removable module 1012:

By changing the first removable module 1011 and the distance of the 2nd removable module 1012, reach the effect that the object to different width carries out ray density distribution adjustment. First removable module 1011 and the 2nd removable module 1012 can two-way adjustable can also be unidirectional adjustable.

Embodiment 2:

As shown in Figure 6, identical with embodiment 1 thinking, two removable modules i.e. the 3rd removable module 1021 and the 4th removable module the 1022, four removable module 1022 can be divided into be inverted, such that it is able to adjust ray density distribution to a greater extent. And the 3rd removable module 1021 and the 4th removable module 1022 can be overlapping, reach narrower ray window.

Embodiment 3:

As shown in Figure 7, independent filter line sheet is made up of by filter line device N, and often pair of filter line sheet can move left and right, thus is combined into various different filter line device shape. The edge of filter line sheet can be right angle, also can be circular. The latter can make formed thickness curve (thicknessprofile) comparatively smooth, reduces the artifact that thus may cause.

Above three embodiments are all arranged on abundant backboard 2 by the mode of slide rail 3, to play auxiliary machinery alignment and to increase the effect of stability. Removable parts then drive by the precision electric motor that controls by computer, it is achieved the optimization of different size scanned object and human body filtered. Every desired location, namely can pass through mechanism screens so that thus the vibrations brought when reducing CT high speed rotating, and can by the position of the mode precision regulating entire filter line device of stepping.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations. Within the spirit and principles in the present invention all, any amendment of doing, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. the preposition filter line device of CT, comprise body (1), it is characterized in that, parallel placement between described body (1) with backboard (2), described backboard (2) has one piece or polylith, described backboard (2) is provided with slide rail (3), described body (1) is split as the 3rd removable module (1021) and the 4th removable module (1022), described 4th removable module (1022) is inverted, ray density distribution can be adjusted to a greater extent, described 3rd removable module (1021) and described 4th removable module (1022) can be overlapping, reach narrower ray window, independent filter line sheet is made up of by described body (1) some, often pair of filter line sheet can move left and right and be combined into various different filter line device shape, the edge of described filter line sheet is right angle or circle, circular filter line sheet makes formed thickness curve smoother, can reduce the artifact thus caused.

2. the preposition filter line device of CT according to claim 1, it is characterized in that, described body (1) is split as the first removable module (1011) and the 2nd removable module (1012), by changing described first removable module (1011) and the distance of described 2nd removable module (1012), reaching the effect that the object to different width carries out ray density distribution adjustment, described first removable module (1011) and described 2nd removable module (1012) can two-ways regulation can also unidirectional regulate.

3. the preposition filter line device of CT according to claim 1, it is characterised in that, described filter line device can adopt copper or aluminum metal material to make, it is also possible to selects specific resin or the plastics of low density, it is also possible to adopts the mode that both combine.