CN109171784A - Dual intensity pass filter, dual intensity mould group and dual intensity x-ray computer tomography device - Google Patents
Dual intensity pass filter, dual intensity mould group and dual intensity x-ray computer tomography device Download PDFInfo
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- CN109171784A CN109171784A CN201810856962.5A CN201810856962A CN109171784A CN 109171784 A CN109171784 A CN 109171784A CN 201810856962 A CN201810856962 A CN 201810856962A CN 109171784 A CN109171784 A CN 109171784A
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- pass filter
- dual intensity
- uptake zone
- mould group
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- 230000009977 dual effect Effects 0.000 title claims abstract description 129
- 238000002591 computed tomography Methods 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 71
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- 229910052718 tin Inorganic materials 0.000 claims description 19
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 16
- 239000010931 gold Substances 0.000 claims description 15
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 14
- 229910052737 gold Inorganic materials 0.000 claims description 14
- 238000003384 imaging method Methods 0.000 claims description 13
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- 229910052707 ruthenium Inorganic materials 0.000 claims description 2
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- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 claims description 2
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- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 5
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computed tomography [CT]
- A61B6/032—Transmission computed tomography [CT]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/40—Arrangements for generating radiation specially adapted for radiation diagnosis
- A61B6/4035—Arrangements for generating radiation specially adapted for radiation diagnosis the source being combined with a filter or grating
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/48—Diagnostic techniques
- A61B6/482—Diagnostic techniques involving multiple energy imaging
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Medical Informatics (AREA)
- Radiology & Medical Imaging (AREA)
- Molecular Biology (AREA)
- Biophysics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Optics & Photonics (AREA)
- Pathology (AREA)
- Physics & Mathematics (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- High Energy & Nuclear Physics (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
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- Theoretical Computer Science (AREA)
- Apparatus For Radiation Diagnosis (AREA)
Abstract
The present invention relates to dual intensity pass filter, dual intensity mould group and dual intensity x-ray computer tomography devices, dual intensity pass filter, it is arranged between radiation source and detector, the first uptake zone and second uptake zone being made of low k-edge material being made of including one side by side high k-edge material, the k-edge value of high k-edge material is in 60 keV or more, and the k-edge value of low k-edge material is in 40kev or less.The present invention can be achieved at low cost dual energy scan, and can guarantee picture quality.
Description
Technical field
The present invention relates to medical image technical field of imaging, and in particular to dual intensity computer tomography technology, especially
It is related to dual intensity pass filter, dual intensity mould group and dual intensity x-ray computer tomography device.
Background technique
In the prior art, there are a variety of implementations for dual intensity computer tomography technology (DECT):
First way and simplest implementation, be exactly using existing scanning device, make bulb at two not
With two groups of series of scans are carried out under voltage, to obtain two groups of entirely different energy spectrums.Will not additionally it increase in this way
Add the equipment cost of scanning device, but since it is desired that two groups of scanning, temporal delay can reduce the speed of scanning patient；Together
When, since duration scanning is relatively long, it will also result in picture quality in the activity that two groups of scanning gaps are scanned person's limbs
Problem.
The second way is to add one group of bulb and detector on the rack more, makes bulb work under different tube voltages
Make, to be different from one group of original bulb detector, as shown in Fig. 1.Since the method must add one group of bulb and spy more
Device device is surveyed, so equipment cost can be relatively high；Meanwhile because the measurement open country of second group of bulb detector is smaller, scan vision
Corresponding to reduce, the image sample of acquisition is also not quite similar, therefore can accordingly sacrifice some picture qualities.
The third mode is to allow the tube voltage of existing bulb, while gantry rotation, rapidly in high and low voltage number
Switch (usually 140kVp and 80kVp) between value, so that two groups of different energy spectrums are obtained in continuous exposure, such as attached drawing 2
It is shown.Because low tube voltage photon flux is also much lower under identical tube current, so in the case where low-voltage exposure,
Quick tube current switching needs sufficiently to improve tube current to guarantee photon flux as before, and this mode is come relatively
Say that cost is also relatively high, because the technology for being switched fast the voltage and current of power supply is relatively complicated；Meanwhile another disadvantage
Be acquisition image pattern not in the same angle, so can also sacrifice a part picture quality.
4th kind of mode is using a kind of special multi-layer detector, and the first layer of detector is for absorbing low-energy light
Son, the second layer is for absorbing high-energy photons, as shown in Fig. 3.This mode needs to add expensive detector, and spectrum
Isolated method can be inferior to other dual intensity CT implementations due to decaying probability.
Above several implementations in practical applications or need expensive cost or need to sacrifice picture quality,
As a result all not fully up to expectations.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a kind of novel dual intensity filtration
Device can be achieved at low cost dual energy scan, and can guarantee picture quality.
The present invention also provides a kind of dual intensity mould group simultaneously, makes low side machine that can realize dual intensity to high terminal, without
Expensive accessory.
The present invention finally also provides a kind of dual intensity x-ray computer tomography device.
When X-ray generates injection in X-ray tube anode, they can generate an energy spectrum, as photon in X-ray beam
The range of energy and their relative intensities under each energy, as shown in Fig. 4.Spectrum is made of two kinds of X-ray:
Characteristic ray and bremsstrahlung ray.Characteristic ray has energy peak relevant to bulb target substance feature, and bremstrahlen is penetrated
Line is the smooth function of photon unit energy.
In general, when a photon passes through a kind of substance, the probability of the two interaction can be with the drop of photon energy
It is low and increase.Therefore, during generating decaying with certain substance that X-ray beam passes through, from ratio for, ray
In energy photons than high-energy photons decay than it is more, ray beam is therefore by " hardening ", term used description original
First harness has been translated into higher average energy, and the higher ray beam of high-energy photons ratio.Attached drawing 4
In illustrate this process: as photon successfully passes bulb target substance, bulb filters window (fixed pass filter), followed by preceding filtration
Device is finally patient itself, and light beam progressively hardens in the process.Each stage, the average energy of light beam can all change more
Come higher.
However there is a special case, the attenuation coefficient of high-energy photons is higher than some energy photons, such case
Be referred to as k-edge, the combination energy of such case electronics in photon energy and filtration substance closest to when can occur, member
The k-edge of plain substance is corresponding with their atomic mass, and high-quality secondary element has the k-edge of higher-energy.All substances are all
There is k-edge, still, the k-edge of the substance of low atomic mass is also commonly known as under the effective range that bulb exports
Low k-edge substance.Different filtration substances can efficiently generate different preceding filtration spectrum, and as shown in Fig. 5, Al (aluminium) is one
A low k-edge pass filter, La (lanthanum) are a k-edge pass filters, can using these high k-edge and low k-edge pass filter
Greatly to change power spectrum.
Since the photon of low energy most in reality can be all absorbed by the patient, these energy photons not only can
The dose of radiation for increasing patient, and will not enhance picture signal, thus medicine CT all by plus some preceding filtering devices come
The photon of these low energy is reduced, to have the function that preparatory hardened beam.This can be low by one simple plate of installation
K-edge pass filter (such as: aluminium) is reached.
Butterfly pass filter (bowtie filter) can be used to adjust beam intensity on human body section.Due to the people that lies low
The style characteristic of body is the position human body thickness maximum by central axis, and more gradually decreasing finally toward both sides thickness is zero.Therefore,
Higher photon flux is needed in the position by human body central axis compared in marginal position for the noise characteristic in the case of this.
The shape design of butterfly pass filter lacks some photons in center decaying just in order to decay more photons at edge, to suffer from
Equivalent noise is generated on person's section.Attached drawing 6 illustrates the shape of a typical butterfly pass filter, it is by the road of light beam
An attenuating material is placed on diameter come what is realized, as angle increases, the motion path of ray in this direction is longer, butterfly
The section of pass filter is designed, and so that it is horizontally adjusted beam intensity, while not changing light beam in the axial direction, collimation and screen
It covers and guarantees that light beam is only beaten in predetermined region.After butterfly pass filter, dose of radiation is not only reduced, and expand detector
Dynamic range, also, butterfly pass filter also has the function of hardened beam.One butterfly pass filter can be used to harden X simultaneously
Light light beam and change beam intensity, in some cases it may which an additional plus plate pass filter is used for further hardened beam.
Under normal conditions, scanner have two to three different butterfly pass filters for filter across head, body, very
In different scanning, the figure and scanning according to different patients are needed as shown in Fig. 7 to the ray of more large interface object
Corresponding butterfly pass filter is chosen at position, when patient size is larger or scanning area becomes larger, should choose bigger filtration
Device.
In order to solve the above technical problems, a kind of technical solution that the present invention takes is:
A kind of dual intensity pass filter is arranged between radiation source and detector, including arranged side by side one by high k-edge
The first uptake zone and second uptake zone being made of low k-edge material of material composition, by ray beam in axial side
It separates upwards.The k-edge value of high k-edge material in 60KeV or more, the k-edge value of low k-edge material in 40KeV hereinafter,
First uptake zone and the second uptake zone are preferably symmetrically disposed adjacent side by side, and perpendicular with the radiation direction of radiation source.
As shown in Fig. 8, wherein four width figures are obtained under a common angle and water mould thickness, describe in figure
The power spectrum of tin and gold, has higher mA than unfiltered power spectrum.
In the present invention, high k-edge material selection at room temperature, k-edge value consolidating between 60KeV and 90KeV
Body metal.
First uptake zone can be made of homogenous material, material selection ytterbium, lutetium, hafnium, tantalum, tungsten, rhenium, osmium, iridium, platinum, gold,
Thallium, lead, bismuth, one of polonium.
First uptake zone can also be made of composite material, it is important that, composite material wherein at least includes
A kind of high k-edge material, high k-edge material selection ytterbium, lutetium, hafnium, tantalum, tungsten, rhenium, osmium, iridium, platinum is golden, thallium, lead, bismuth, in polonium
One kind.
In the present invention, the second uptake zone can also select homogenous material or composite material to form, if using composite wood
Material, it should be noted that it is main in material to be made of low k-edge material, low k-edge material be selected from lithium, beryllium, sodium, magnesium,
Aluminium, potassium, calcium, scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, gallium, rubidium, strontium, yttrium, zirconium, niobium, molybdenum, technetium, ruthenium, rhodium, palladium, silver,
One of cadmium, indium, tin, caesium, barium, lanthanum are a variety of.
In the present invention, dual intensity material has very high Decay Rate due to the selection of substance characteristics and thickness.It is inhaled by first
The reduction amount of area and the second uptake zone photon flux is received to 15%-25%.But this than regular meeting because of bulb and generator
It chooses and changes.If the effect of spectrum separation is not very well, the substance for choosing more highly attenuating degree to be needed (to need to be used as material
Better bulb and generator).In addition, the present invention uses the tube voltage of 120kVp, it can be according to the agreement specifically chosen from can
It is chosen within the scope of the tube current of choosing and manages electric current appropriate.Specifically: such as user's use is to choose originally in no dual intensity module
Scan protocols in sweep parameter be 120kVp, 100mAs, they can use 120kVp's when there is dual intensity module
Tube voltage, the tube current between 350-420mAs, default setting 400mAs, the tube current bigger than 100mAs is for photon
The compensation of flux reduction.
Slabbing or other pass filter common shapes can be set in first uptake zone and the second uptake zone.
In order to obtain better dose profile curve and detector dynamic range, dual intensity pass filter of the present invention further includes filtration
Device ontology, the low k-edge material of the material selection of pass filter ontology, the first uptake zone and the second uptake zone are disposed side by side on filtration
Side of the device ontology far from radiation source, the first uptake zone and the second uptake zone are located along the same line with pass filter ontology, preferably
Ground, pass filter ontology are arranged to butterfly, as shown in Fig. 9.
In the present invention, the first uptake zone and the second uptake zone can be stuck or be otherwise secured to pass filter sheet
The bottom of body, and the shape of the first uptake zone and the second uptake zone is consistent with the bottom shape of pass filter ontology.It in this way can be with
Guarantee that light beam passes through butterfly pass filter completely, and is divided into two beam difference light beams, since focus size is limited, two in the axial direction
The overlapping of light beam is also very small, and compared with the size of the x-ray detector of axis direction, the overlapping of such limited light beam will not
Cause big offset issue.
Dual intensity CT of the present invention by least two groups there is the image data set of enough power spectrums separation to realize, can be with based on this
Clearly calculate the composition information of substance.In addition, this two group image information can also by with from a variety of different practical applications
Face, to promote the diagnostic strength of radiologist, including virtual monoergic imaging (VMI), base substance decomposition (BMD), virtual
Non- comparison or non-calcium imaging (VNCI).In such applications, image data set can be decomposed into substantially by primary image algorithm for reconstructing
Material information, or referred to as base substance decomposition (BMD), this method can distinguish the ratio of two kinds of different materials in object, this to answer
With being especially advantageous for distinguishing different types of kidney stone.Some applications add including weighting or weighting subtracts these substratess matter, such as
In the application of VMI, weighted addition is used, under this auxiliary, radiologist be can choose in any range
Data are rebuild on virtual energy, low energy scans the image for obtaining more high contrast, and high-energy scanning obtains higher signal-to-noise ratio
(SNR) image, according to specific sweep object and clinical manifestation, radiologist may choose the image of more low energy
Signal-to-noise ratio is promoted to promote contrast or high-energy image, and VMI can realize that the virtual data under single sweep operation is rebuild.
VNCI is a kind of weighting subtraction algorithm, it can subtract specific substratess matter from image information, for example, not having bone substance
In the case where rebuild data and can increase the detectability of calcified plaque；One group of data meeting is rebuild in the case where no iodine substance
A virtual non-contrast images are generated, as shown in Fig. 13, sweep object is 56 years old male patient, suffers from left upper lobe of lung
Gland cancer (A), blending image (B) and selective iodine perfusion figure (D) display, in borderline tumor hyperperfusion, iodine in central area
Absorb less, corresponding virtual non-comparison CT image (C) shows the low decaying of the central tumor region of Low perfusion, shows tumour
Vigor it is lower (figure and title select from<the functional CT imaging technique of lung cancer angiogenesis>that Henzler etc. is delivered, 2012
On March 1, in, translation are printed from<lung cancer research>the 1st phase, the 1st).This mode compares before and after can capable of generating after single sweep operation
Image information, to reduce dose of radiation by reducing non-contrast scans.Dual intensity CT whether have can with the spokes such as conventional
Two group image informations are just obtained in the case where penetrating dose scan, depending on realizing the concrete mode of dual intensity, and the present invention is inexpensive
Dual intensity mould group can significantly optimize clinical information and diagnosis capability that scanning obtains, while not will increase dramatically dose of radiation again.
The present invention also provides another technical solution simultaneously:
A kind of dual intensity mould group, including at least two pass filters, wherein at least one pass filter are above-mentioned dual intensity pass filter.
In order to make CT machine that can not only carry out double-energy scanning, conventional sweep can also be carried out, dual intensity mould group further includes list
Material pass filter (Al) or the pass filter of other progress conventional sweeps, as shown in Fig. 10.
The section thickness of pass filter ontology is smaller, the section thickness of pass filter ontologyIts
In, θ is that light source is radiated at the angle on pass filter ontology between certain point and light source center line, and L is mono-material pass filter at angle
The thickness of θ is spent, as shown in Fig. 18, in this way, total photon flux by dual intensity pass filter just can control in bulb and generator
In performance range, and guarantee that photon total flux does not change substantially.
In order to keep dual intensity mould group shape more compact, mono-material pass filter and dual intensity pass filter shape are arranged just as preferably
Butterfly.
In the present invention, mono-material pass filter arranges in any order with dual intensity pass filter, and usually arrangement is only repeated once.
For example, dual intensity mould group may be swept comprising a pair the pass filter that head uses, a pair of of body portion's pass filter and it is a pair of any other
The pass filter of size.The number of pass filter is unrestricted, moreover, pass filter can arrange in any order.For example, one is commonly swept
It is the pass filter for commonly sweeping body portion on the butterfly pass filter side on head, the dual intensity pass filter on head is swept followed by one, so
It is the dual intensity pass filter for sweeping body portion afterwards, arrangement is only repeated once.
The k-edge material as used in dual energy pass filter have height Decay Rate, and its path length with
Angle change, so the shape and size of butterfly will not be identical, such as 11 institute of attached drawing in conventional and dual energy pass filter
Show, this figure is not absolute data, is only intended to illustrate the relationship of different disk shape and thickness.
Dual intensity mould group of the present invention can not only carry out double-energy scanning, can also carry out conventional sweep.Due to double relative to other
It can scan, this technical implementation way is relatively easy and cost is relatively low, therefore can apply from introduction/low side machine to high terminal
This technology.But due to the difference of hardware configuration, the bulb and high pressure generator of high terminal have higher fan-out capability, therefore
The dual energy scan protocol type that may be implemented, also can be more more than entering door machine/low side machine.
The present invention finally also provides another technical solution:
A kind of dual intensity x-ray computer tomography device, including above-mentioned dual intensity pass filter or dual intensity mould group, dual intensity filter
It crosses device or dual intensity mould group is arranged between radiation source and detector, guarantee the center of dual intensity pass filter and the focus center of radiation source
Position alignment, light beam are entirely fallen on dual intensity pass filter, as shown in Fig. 12.
Preferably, collimator is set between radiation source and detector, and dual intensity pass filter or dual intensity mould group are arranged in radiation source
Between collimator, imaging region is set between collimator and detector.
Preferably, collimator is set between radiation source and detector, between collimator and detector successively along radiation direction
Place dual intensity pass filter or dual intensity mould group, imaging region.
Preferably, collimator is set between radiation source and detector, between collimator and detector successively along radiation direction
Place imaging region, dual intensity pass filter or dual intensity mould group.
Preferably, dual intensity pass filter will be placed on the motor with enough step resolutions and control movement, with
Guarantee that the center of dual intensity pass filter can will be entirely fallen on dual intensity pass filter with the focus center position alignment of x-ray tube, light beam.
Due to the use of above technical scheme, the invention has the following advantages over the prior art:
1, at low cost, the present invention realizes dual energy scan, also optimizes the conventional sweep in system, and does not need additional
Add the high-end CT component of hardware or complex and expensive.
2, easy to operate, operator can carry out conventional sweep similar with standard CT system.
3, have a wide range of application, even the machine of entry level, the function of dual intensity CT can also be realized using the present invention, is improved
The diagnostic strength of machine.
4, diagnosis capability is reinforced, and with common CT is same or similar radiation dosage, applies of the invention
CT machine has a significant reinforcement in diagnosis capability, and other several methods for realizing dual intensity CT, can make the dose of radiation of scanned person
Obviously increase (such as sequential scan method, double bulbs/detector method).
5, promoted picture quality, the present invention be each Spectrum acquisition provide isogonism sampling, compared with other not isogonism sample
Method (such as double bulb/probe methods, quick high-pressure switch method), more can guarantee and promoted picture quality.
6, for picture quality, since the power spectrum of dual energy light beam is narrower than ordinary beam of light, so once scanner quilt
Calibration, CT value (Hounsfield Units) is more stable, closer to true value, helps to realize quantitative imaging and (is based only upon HU
The substance of value determines).
Detailed description of the invention
Fig. 1 is the dual energy scan figure to be worked based on double bulb double detectors；
Fig. 2 is the schematic diagram for being switched fast method dual energy scan；
Fig. 3 is the dual energy scan figure of double decker detector；
Fig. 4 is the range of photon energy and the X-ray spectrum of relative intensity；
Fig. 5 is the X-ray spectrum of two different filtration substances；
Fig. 6 is the X-ray system schematic diagram with butterfly pass filter；
Fig. 7 is butterfly pass filter schematic diagram of different shapes；
Fig. 8 is light beam by pass filter energy spectrum diagram, and most left figure is that standardization light beam passes through butterfly pass filter；Middle left figure is light
Beam passes through butterfly pass filter and tin (Sn)；Middle right figure is light beam through butterfly pass filter and gold (Au)；Most right figure is the middle left and middle right side
Figure is in same reference axis；
Fig. 9 is dual intensity pass filter schematic diagram；
Figure 10 is dual intensity mould group schematic diagram；
Figure 11 is the path length figure of different butterfly pass filters；
Figure 12 is that dual intensity pass filter is placed in the position view between radiation source and detector；
Figure 13 is " virtual 120kV " dual energy CT figure that Contrast enhanced calculates；
Figure 14 is the reconstruction image (6 points and 9 directions) and iodine solution (12 directions and 3 directions) of water mould and cortex bone
Scanning figure at 80 and 140kVp, and each by gold and scanning figure of the tin in 120kVp, wherein unit
For Hu；
Figure 15 is the VMI figure under different-energy, and VMI is the Heng Shi with the scanning according to measurement base substance under prescribed energy
Unit is obtained and is superimposed, to obtain image；
Figure 16 is to bone and go water in 80/140kVp, and bone and go sweeping for water by gold/tin combination filtering
Tracing；
Figure 17 is bone, iodine, the average Heng Shi unit figure at 80/140kVp and gold/tin combination of water, Yi Jitong
The average Heng Shi unit figure of water of boning in the case of sample；
Figure 18 is the schematic diagram of θ and L in butterfly pass filter.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and embodiments.
Embodiment 1
Dual intensity pass filter, including butterfly pass filter ontology, material are aluminum 1100 material, and the first uptake zone is arranged side by side in bottom
With the second uptake zone, the first uptake zone material is gold, and the second uptake zone material is tin, in VarexGS-5071 type bulb and
Under Spellman X5427 high pressure generator (HVG) configuration, 0.1mm is arranged in golden thickness, and 0.5mm is arranged in the thickness of tin.
Embodiment 2
Dual intensity pass filter, including butterfly pass filter ontology, material are aluminum 1100 material, and the first uptake zone is arranged side by side in bottom
With the second uptake zone, bottom the first uptake zone material is gold, and the second uptake zone material is tin, in Varex GS-5071 type bulb
Under Spellman X5427 high pressure generator (HVG) configuration, 0.3mm is arranged in golden thickness, and 0.8mm is arranged in the thickness of tin.
Embodiment 3
Dual intensity pass filter, including butterfly pass filter ontology, material are aluminum 1100 material, and the first uptake zone is arranged side by side in bottom
With the second uptake zone, bottom the first uptake zone material is gold, and the second uptake zone material is tin, in Varex GS-5071 type bulb
Under Spellman X5427 high pressure generator (HVG) configuration, 0.2mm is arranged in golden thickness, and 0.6mm is arranged in the thickness of tin.
Embodiment 4
Dual intensity pass filter, including butterfly pass filter ontology, material are aluminum 1100 material, and the first uptake zone is arranged side by side in bottom
With the second uptake zone, bottom the first uptake zone material is tungsten, and the second uptake zone material is copper, in Varex GS-5071 type bulb
Under Spellman X5427 high pressure generator (HVG) configuration, 2mm is arranged in the thickness of tungsten, and 18.5mm is arranged in the thickness of copper.
Embodiment 5
Dual intensity mould group, the butterfly pass filter made of aluminum 1100 material including two mono-materials, be respectively used to head and
Body scan data；Two dual intensity pass filters, for separating ray beam, using the structure setting in embodiment 3.Wherein, pass filter
The section thickness of ontologyWherein, θ is that light source is radiated at certain point and light source on pass filter ontology
Angle between center line, L are thickness of the mono-material pass filter in angle, θ.
Usually, light beam can be just divided into just average two halves by dual intensity pass filter, but if light beam appearance is other
Segregation ratio, this situation also should belong to scope of patent protection.The k-edge of gold is 80.7keV, is equivalent to beam and is averaged energy
Amount can pass through dual intensity pass filter at any angle, and pass through additional 30 centimetres of depth of water.But wherein also have " gas leakage " feelings
Condition, i.e., as light beam penetrates patient/substance, the rear proportional increase of quantity for filtering photon hyperfiltration piece k-edge (see attached drawing 5).
Even if but there is gas leakage situation, light beam average energy also can guarantee the k-edge lower than gold in these cases.The k-edge of tin
For 29.2keV, lower than the minimum photon energy in incident beam, this indicates the influence very little of tin k-edge, so tin substance
It is mainly used to harden ray, in all feelings by angle plus additional water mould thickness less than or equal to 30 centimetres of dual intensity pass filter
Under condition, the average energy of harness can be 80 between 95keV after tin filtering.The harness filtered using tin and this golden combination,
In the case that the angled and additional water mould thickness of pass filter institute is less than or equal to 30 centimetres, energy difference is in 10keV or so.
Embodiment 6
A kind of dual intensity x-ray computer tomography device, including radiation source, detector, between radiation source and detector
Collimator is set, and dual intensity mould group is arranged between radiation source and collimator, and imaging region is arranged between collimator and detector, double
Energy mould group selects Varex GS-5071 type bulb and Spellman X5427 high pressure using the structure in embodiment 5, radiation source
Raw device (HVG).
Embodiment 7
A kind of dual intensity x-ray computer tomography device, including radiation source, detector, between radiation source and detector
Collimator is set, is sequentially placed dual intensity mould group, imaging region along radiation direction between collimator and detector, dual intensity mould group uses
Structure in embodiment 5, radiation source select Varex GS-5071 type bulb and Spellman X5427 high pressure generator (HVG).
Embodiment 8
A kind of dual intensity x-ray computer tomography device, including radiation source, detector, between radiation source and detector
Collimator is set, is sequentially placed imaging region, dual intensity mould group along radiation direction between collimator and detector, dual intensity mould group uses
Structure in embodiment 5, radiation source select Varex GS-5071 type bulb and Spellman X5427 high pressure generator (HVG).
Comparative example
Using the dual intensity x-ray computer tomography device and common computer x-ray tomography dress in embodiment 8
It sets and same substance is tested, test result is as shown in attached drawing 14 to 17.
Figure 14-16 is simulated by ray tracing algorithm Lai that is, after having chosen geometry and material, measuring and calculating is tied
Fruit.Therefore, image be calculated by the FBP with Ram-Lak pass filter Lai.The material on basis, which decomposes, uses two kinds of material (water
And iodine).
Test result is shown: the combination of gold/tin can provide the effect closely similar with 80/140kV.The present invention does not need
Continuous scanning (continuous scanning under different kV), meanwhile, the dual intensity single sweep operation of picture quality and injection line source simple detector
As a result very close.Especially, implementation need to only add a dual intensity mould group on common CT.Therefore, this mould group can make
Most common CT carries out dual energy scan, and the dual intensity CT that the picture quality obtained and the bis- crush-cuttings of 80kVp and 140kVp change
It is closely similar.
The present invention is described in detail above, the explanation of embodiment be merely used to help understand method of the invention and
Its core concept, its object is to allow the personage for being familiar with this field technology to can understand the content of the present invention and implement it accordingly, and
The protection scope that the present invention cannot be limited in this way.Any equivalent change or modification in accordance with the spirit of the invention should all be contained
Lid is within protection scope of the present invention.
Claims (19)
1. a kind of dual intensity pass filter, be arranged between radiation source and detector, it is characterised in that: including be arranged side by side one by
The first uptake zone and second uptake zone being made of low k-edge material of high k-edge material composition, high k-edge material
The k-edge value of material is in 60keV or more, and the k-edge value of low k-edge material is in 40kev or less.
2. dual intensity pass filter according to claim 1, it is characterised in that: first uptake zone is made of homogenous material,
The material selection ytterbium of first uptake zone, lutetium, hafnium, tantalum, tungsten, rhenium, osmium, iridium, platinum, gold, thallium, lead, bismuth, one of polonium.
3. dual intensity pass filter according to claim 1, it is characterised in that: first uptake zone is made of composite material,
The composite material include at least a kind of high k-edge material, the high k-edge material selection ytterbium, lutetium, hafnium, tantalum, tungsten, rhenium,
Osmium, iridium, platinum, gold, thallium, lead, bismuth, one of polonium.
4. dual intensity pass filter according to claim 1, it is characterised in that: the low k-edge material be selected from lithium, beryllium, sodium,
Magnesium, aluminium, potassium, calcium, scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, gallium, rubidium, strontium, yttrium, zirconium, niobium, molybdenum, technetium, ruthenium, rhodium, palladium,
One of silver, cadmium, indium, tin, caesium, barium, lanthanum are a variety of.
5. dual intensity pass filter according to claim 1, it is characterised in that: pass through the first uptake zone and the second uptake zone photon
The reduction amount of flux is to 15%-25%.
6. dual intensity pass filter according to claim 1, it is characterised in that: first uptake zone is all provided with the second uptake zone
It is set to sheet.
7. dual intensity pass filter according to claim 1, it is characterised in that: it further include pass filter ontology, the pass filter sheet
The low k-edge material of the material selection of body, first uptake zone and the second uptake zone and the pass filter ontology are located at always
On line.
8. dual intensity pass filter according to claim 7, it is characterised in that: the pass filter ontology is arranged to butterfly.
9. dual intensity pass filter according to claim 7, it is characterised in that: first uptake zone is fixed with the second uptake zone
In the bottom of the pass filter ontology, and the bottom of the shape of first uptake zone and the second uptake zone and the pass filter ontology
Portion's shape is consistent.
10. a kind of dual intensity mould group, it is characterised in that: including at least two pass filters, wherein at least one pass filter is such as right
It is required that dual intensity pass filter described in any one of 1 to 9.
11. dual intensity mould group according to claim 10, it is characterised in that: further include mono-material pass filter, the mono-material
The material of pass filter is selected from aluminium.
12. dual intensity mould group according to claim 11, it is characterised in that: the section thickness of the pass filter ontologyWherein, θ is that light source is radiated on pass filter ontology between certain point and light source center line
Angle, L are thickness of the mono-material pass filter in angle, θ.
13. dual intensity mould group according to claim 11, it is characterised in that: the mono-material pass filter and dual intensity pass filter shape
Shape setting just as.
14. dual intensity mould group according to claim 11, it is characterised in that: the mono-material pass filter and dual intensity pass filter are equal
It is arranged to butterfly.
15. dual intensity mould group according to claim 11, it is characterised in that: the mono-material pass filter is pressed with dual intensity pass filter
Random order arrangement.
16. a kind of dual intensity x-ray computer tomography device, it is characterised in that: filtered including dual intensity as described in claim 1
Device or dual intensity mould group as claimed in claim 11 are crossed, the dual intensity pass filter or dual intensity mould group are arranged in radiation source and detector
Between, guarantee the center of dual intensity pass filter and the focus center position alignment of radiation source, light beam is entirely fallen on dual intensity pass filter.
17. dual intensity x-ray computer tomography device according to claim 16, it is characterised in that: the radiation source
Collimator is set between detector, and the dual intensity pass filter or dual intensity mould group are arranged between radiation source and collimator, described
Imaging region is set between collimator and detector.
18. dual intensity x-ray computer tomography device according to claim 16, it is characterised in that: the radiation source
Collimator is set between detector, is sequentially placed the dual intensity pass filter along radiation direction between the collimator and detector
Or dual intensity mould group, imaging region.
19. dual intensity x-ray computer tomography device according to claim 16, it is characterised in that: the radiation source
Collimator is set between detector, is sequentially placed imaging region, described along radiation direction between the collimator and detector
Dual intensity pass filter or dual intensity mould group.
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Application publication date: 20190111 |
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| RJ01 | Rejection of invention patent application after publication |