CN104127198A - Front line filter for CT - Google Patents

Front line filter for CT Download PDF

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Publication number
CN104127198A
CN104127198A CN201410326441.0A CN201410326441A CN104127198A CN 104127198 A CN104127198 A CN 104127198A CN 201410326441 A CN201410326441 A CN 201410326441A CN 104127198 A CN104127198 A CN 104127198A
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CN
China
Prior art keywords
filter line
removable module
backboard
ray
line filter
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Granted
Application number
CN201410326441.0A
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Chinese (zh)
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CN104127198B (en
Inventor
孙明山
邢晓曼
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Suzhou Institute of Biomedical Engineering and Technology of CAS
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Suzhou Institute of Biomedical Engineering and Technology of CAS
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Priority to CN201410326441.0A priority Critical patent/CN104127198B/en
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Abstract

The invention discloses a front line filter for CT. The front line filter comprises a body, the body and a backboard are placed in parallel, the number of the backboards is one or more, a sliding rail is arranged on the backboard, and the body can move in a reciprocating mode. Through the design of movable modules, the shape of the front line filter is changed, and therefore optimization and adjustment are conducted on ray intensity distribution; through finer ray intensity adjustment, acquired data are optimized, and radiation dose suffered by patients is reduced. A novel line filter fixing and moving mode is adopted, therefore, it is guaranteed that a system is stable, reliable and convenient to achieve; the line filter replacement and adjustment time is saved, and therefore the waiting time of the patients is shortened.

Description

The preposition filter line of a kind of CT device
Technical field
The present invention relates to a kind of filter line device, be specifically related to the preposition filter line of a kind of CT device.
Background technology
CT is the product that electronic computer combines with X-ray technique, can give particulars 2D, 3D rendering clearly, and also price is relatively cheap, doctor is made rapidly to clinical diagnosis and provide a great help.But x-ray source used in CT is not all monochromatic source, but has the x-ray source of certain spectrum width, and x-ray photon energy differs.Absorptance reduces with the increase of x-ray energy, and this just means that high-energy photon decay is little, and lower energy photon decay is large, therefore on the image after reconstruction, produces " cup-shaped " artifact, and this artifact is just called x-ray sclerosis artifact.Because x-ray bundle hardening effect causes the inconsistent of data in x-ray projection, there is thick filaments of sun shadow in result in the middle of bone structure image.This depend on x-ray bundle density and the thickness of tissue of process.For body partial density and the near tissue of water, as soft tissue, thisly on the impact of CT image, can compensate.But as hip, shoulder, basis cranii etc., the region that strip artifact and CT value reduce is visible in high density area.The way that solves this artifact is to adopt compensation filter line device or change algorithm for reconstructing parameter to arrange to make these artifact impacts to reduce.Adopt reasonably filter line device can make subsequent software processing more easy.
Preposition filter line device can also reach best imaging effect by optimizing the distribution of X ray intensity.No longer even while arriving detector due to equally distributed X ray by patient, the signal that core detects is obviously weaker than edge later, affects the total quality of image; If improve the signal in centre, will make the quantity of X-rays X of marginal portion increase, to patient, bring unnecessary skin dose.In order to address this problem, can design the shape of filter line device, make marginal ray intensity be weaker than center, the transmitted intensity that arrives detector by patient is comparatively even, thereby improves the dynamic range of detector.
Preposition filter line device also has great role for suppressing ray scattering.Fan-shaped/taper ray produces a large amount of scatterings at patient body's edge, causes unnecessary radiation dose, in order to reduce radiation damage, can weaken the transmitted intensity of edge, thereby reduces radiation dose.
The preposition filter line of traditional CT device has its corresponding shortcoming, because the thickness of its design changes, be for specific die body, therefore when imaging object shape has change, the adjustment to transmitted intensity is realized in the position that often can only be filtered line device or be changed filter line device by replacing, adjusting range is very limited, can only be more data-optimized than without filter line device time, can not reach the state of relative ideal.
Summary of the invention
The object of the invention is to overcome the problem that prior art exists, the method for designing of the preposition filter line of a kind of CT device is provided.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:
The preposition filter line of a CT device, comprises body, parallel placement between described body and backboard, and described backboard has one or polylith, on described backboard, is provided with slide rail.
Further, described body is split as the first removable module and the second removable module, by changing the distance of described the first removable module and described the second removable module, reach the effect of the object of different width being carried out to ray density distribution adjusting, described the first removable module and the second removable module can two-ways regulation also can unidirectionally regulate.
Further, described body is split as the 3rd removable module and the 4th removable module, and described the 4th removable module is inverted, and can adjust to a greater extent ray density distribution, described the 3rd removable module and described the 4th removable module can be overlapping, reach narrower ray window.
Further, described body is comprised of independent filter line sheet some, and every pair of filter line sheet can move left and right and be combined into various filter line device shape, and described filter line sheet is right angle or circle; Circular filter line sheet makes become thickness curve smoother, can reduce the artifact causing thus.
Further, described filter line device can adopt copper or aluminum tradition filter line device metal material to make, and also can select low-density specific resin or plastics, the mode that can also adopt both to combine.
Preferably, low-density specific resin or plastics advantage are there is close X ray absorption characteristic with water, and because desired thickness size increases, can reduce mechanical movement equal error.
Beneficial effect of the present invention:
The present invention, by the design of removable module, changes the shape of preposition filter line device, thereby ray density distribution is optimized to adjustment, and by meticulousr adjustment transmitted intensity, optimizes the data that gather, and reduces the suffered radiation dose of patient; Novel filter line device is fixed and move mode, thereby the system of assurance is reliable and stable, and convenient realization, saves and changes the time of adjusting filter line device, thereby reduce patient's waiting time.
Accompanying drawing explanation
Fig. 1 is the application schematic diagram in background technology of the present invention;
Fig. 2 is the preposition CT filter of the tradition in background technology of the present invention line device schematic diagram, and left and right is respectively arc and Bowtie filter line device;
Fig. 3 is the ray density distribution schematic diagram after the preposition CT filter of the tradition in background technology of the present invention line device position is adjusted;
Fig. 4 is the schematic diagram to different imagings position employing difformity filter line device in background technology of the present invention;
Fig. 5 (a) and Fig. 5 (b) are the schematic diagrams (in figure, solid line body is fixture, 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 fixture, 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 mounting structure schematic diagram of filter line device module of the present invention.
Number in the figure explanation: 1, body (filter line device module), the 1011, first removable module, the 1012, second removable module, the 1021, the 3rd removable module, the 1022, the 4th removable module, 2, backboard, 3, slide rail.
The specific embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
As shown in Figure 8, the preposition filter line of a kind of CT device, comprises body 1, parallel placement between described body 1 and backboard 2, and described backboard 2 has one or polylith, on described backboard 2, is provided with slide rail 3.
Embodiment 1:
As Fig. 5 (a) with 5(b), splitting arc filter line device is i.e. the first removable module 1011 and the second removable modules 1012 of two removable modules:
By changing the distance of the first removable module 1011 and the second removable module 1012, reach the effect of the object of different width being carried out to ray density distribution adjusting.The first removable module 1011 and the second removable module 1012 are can be two-way adjustable also can be unidirectional adjustable.
Embodiment 2:
As shown in Figure 6, identical with embodiment 1 thinking, can be divided into two removable modules is that the 3rd removable module 1021 and the 4th removable module 1022, the four removable modules 1022 can be inverted, thereby can adjust to a greater extent ray density distribution.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, filter line device is comprised of independent filter line sheet N, and every pair of filter line sheet can move left and right, thereby is combined into various filter line device shape.The edge of filter line sheet can be right angle, can be also circular.The latter can make become thickness curve (thickness profile) comparatively smooth, reduces the artifact that may cause thus.
Above three embodiment all can be arranged on by the mode of slide rail 3 on abundant backboard 2, aim at and increase the effect of stability to play Aided Machine.Movable part can, by being driven by computer-controlled precision electric motor, be realized the optimization of the big or small scanned object of difference and human body is filtered.Every desired location, can pass through machinery screens, thus the vibrations that bring while making to reduce CT high speed rotating, and the position of mode precision regulating entire filter line device that can be by 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 modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (5)

1. the preposition filter line of a CT device, comprises body (1), it is characterized in that, and parallel placement between described body (1) and backboard (2), described backboard (2) has one or polylith, is provided with slide rail (3) on described backboard (2).
2. the preposition filter line of CT according to claim 1 device, it is characterized in that, described body (1) is split as the first removable module (1011) and the second removable module (1012), by changing the distance of described the first removable module (1011) and described the second removable module (1012), reach the effect of the object of different width being carried out to ray density distribution adjusting, described the first removable module (1011) and described the second removable module (1012) can two-ways regulation also can unidirectionally regulate.
3. the preposition filter line of CT according to claim 1 device, it is characterized in that, described body (1) is split as the 3rd removable module (1021) and the 4th removable module (1022), described the 4th removable module (1022) is inverted, can adjust to a greater extent ray density distribution, described the 3rd removable module (1021) and described the 4th removable module (1022) can be overlapping, reach narrower ray window.
4. the preposition filter line of CT according to claim 1 device, it is characterized in that, described body (1) is comprised of independent filter line sheet some, and every pair of filter line sheet can move left and right and be combined into various filter line device shape, and the edge of described filter line sheet is right angle or circle; Circular filter line sheet makes become thickness curve smoother, can reduce the artifact causing thus.
5. the preposition filter line of CT according to claim 1 device, is characterized in that, described filter line device can adopt copper or aluminum tradition filter line device metal material to make, and also can select low-density specific resin or plastics, the mode that can also adopt both to combine.
CN201410326441.0A 2014-07-10 2014-07-10 A kind of preposition filter line device of CT Active CN104127198B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105640581A (en) * 2016-02-29 2016-06-08 江苏美伦影像系统有限公司 Oral cavity CT front X-ray filter
CN109770931A (en) * 2019-01-30 2019-05-21 张文山 A kind of CBCT filter line device automatic regulating apparatus

Citations (11)

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EP0981999A2 (en) * 1998-08-25 2000-03-01 General Electric Company Position dependent beam quality X-ray filtration
US6501828B1 (en) * 1999-10-21 2002-12-31 Siemens Aktiengesellschaft Method and apparatus for influencing X-rays in a beam path
CN1681437A (en) * 2002-09-16 2005-10-12 西门子公司 Computer X-ray camera machine with diaphragm device on the X-ray side and method for circulating it
US20060072705A1 (en) * 2004-10-01 2006-04-06 Varian Medical Systems Technologies, Inc. Devices and methods for providing spatially variable x-ray beam intensity
CN101909523A (en) * 2007-12-28 2010-12-08 皇家飞利浦电子股份有限公司 The filter assembly that is used for computed tomography systems
CN102074276A (en) * 2009-11-16 2011-05-25 西门子公司 Filter for filtering x-rays and x-ray computed tomography
CN102512194A (en) * 2003-10-27 2012-06-27 Ge医疗系统环球技术有限公司 Method and apparatus of radiographic imaging with an energy beam tailored for a subject to be scanned
CN103124520A (en) * 2010-09-30 2013-05-29 皇家飞利浦电子股份有限公司 Dynamic filter for computed tomography (CT)
CN103489496A (en) * 2013-09-10 2014-01-01 沈阳东软医疗系统有限公司 X-ray collimating device for CT machine
CN103841896A (en) * 2012-10-02 2014-06-04 株式会社东芝 X-ray image capture device, wedge filter device, and wedge filter control method
CN103829963A (en) * 2012-11-27 2014-06-04 Ge医疗系统环球技术有限公司 Collimation instrument and CT system with same

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0981999A2 (en) * 1998-08-25 2000-03-01 General Electric Company Position dependent beam quality X-ray filtration
US6501828B1 (en) * 1999-10-21 2002-12-31 Siemens Aktiengesellschaft Method and apparatus for influencing X-rays in a beam path
CN1681437A (en) * 2002-09-16 2005-10-12 西门子公司 Computer X-ray camera machine with diaphragm device on the X-ray side and method for circulating it
CN102512194A (en) * 2003-10-27 2012-06-27 Ge医疗系统环球技术有限公司 Method and apparatus of radiographic imaging with an energy beam tailored for a subject to be scanned
US20060072705A1 (en) * 2004-10-01 2006-04-06 Varian Medical Systems Technologies, Inc. Devices and methods for providing spatially variable x-ray beam intensity
CN101909523A (en) * 2007-12-28 2010-12-08 皇家飞利浦电子股份有限公司 The filter assembly that is used for computed tomography systems
CN102074276A (en) * 2009-11-16 2011-05-25 西门子公司 Filter for filtering x-rays and x-ray computed tomography
CN103124520A (en) * 2010-09-30 2013-05-29 皇家飞利浦电子股份有限公司 Dynamic filter for computed tomography (CT)
CN103841896A (en) * 2012-10-02 2014-06-04 株式会社东芝 X-ray image capture device, wedge filter device, and wedge filter control method
CN103829963A (en) * 2012-11-27 2014-06-04 Ge医疗系统环球技术有限公司 Collimation instrument and CT system with same
CN103489496A (en) * 2013-09-10 2014-01-01 沈阳东软医疗系统有限公司 X-ray collimating device for CT machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105640581A (en) * 2016-02-29 2016-06-08 江苏美伦影像系统有限公司 Oral cavity CT front X-ray filter
CN109770931A (en) * 2019-01-30 2019-05-21 张文山 A kind of CBCT filter line device automatic regulating apparatus

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