CN108685591A - Collimator for detector and its application - Google Patents
Collimator for detector and its application Download PDFInfo
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- CN108685591A CN108685591A CN201810409873.6A CN201810409873A CN108685591A CN 108685591 A CN108685591 A CN 108685591A CN 201810409873 A CN201810409873 A CN 201810409873A CN 108685591 A CN108685591 A CN 108685591A
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- 238000003384 imaging method Methods 0.000 claims abstract description 48
- 230000009977 dual effect Effects 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 2
- 230000002285 radioactive effect Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 12
- 238000002603 single-photon emission computed tomography Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 10
- 230000000007 visual effect Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 5
- 210000002216 heart Anatomy 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 5
- 229910052721 tungsten Inorganic materials 0.000 description 5
- 239000010937 tungsten Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 238000003325 tomography Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 210000004556 brain Anatomy 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 239000011133 lead Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009206 nuclear medicine Methods 0.000 description 2
- 210000000056 organ Anatomy 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 229910052715 tantalum Inorganic materials 0.000 description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 210000001685 thyroid gland Anatomy 0.000 description 1
- 210000001835 viscera Anatomy 0.000 description 1
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- 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
- A61B6/405—Source units specially adapted to modify characteristics of the beam during the data acquisition process
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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]
- A61B6/037—Emission tomography
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Abstract
The invention discloses for detector collimator and its application.Wherein, which includes:Bottom plate, the imaging through-hole in array distribution is provided on the bottom plate, the imaging through-hole includes the first hole section and the second hole section, and the lateral dimension of first hole section is gradually reduced along free end to the direction of second hole section, the lateral dimension of second hole section is gradually reduced along free end to the direction of first hole section;Shielding ring, the shielding ring are formed on the bottom plate;And top plate, the top plate is arranged in the shielding ring, and closes at least partially open of the shielding ring, and the shielding through-hole in array distribution is provided on the top plate, and the imaging through-hole and the shielding through-hole are arranged in a one-to-one correspondence.The collimator by top plate to across the radioactive ray of imaging through-hole carry out it is secondary block, effectively reduce overlapping between the projection of different pin holes, reduce the production cost of collimator.
Description
Technical field
The present invention relates to medicine imaging technique fields, and in particular, to the collimator for detector and its application, more
In particular it relates to the collimator and detector for detector.
Background technology
Emission tomography technology is a kind of nuclear medicine method of non-intrusion type, single photon emission computed tomography at
Picture (SPECT, Single Photon Emission Computed Tomography) is one kind of emission tomography, at present
It is widely used to the drug research and clinical disease diagnosis of pre- clinic.Spatial resolution and detection efficient be weigh SPECT at
As two important technology indexs of performance.SPECT imagings need to collimate ray, and traditional clinical SPECT is provided with flat
Row hole collimator.With the development of nuclear medicine, the spatial resolution and detection efficient of parallel aperture collimator SPECT are difficult to meet more
High clinical demand is imaged for organella, such as heart, thyroid gland, brain, if the detector to tradition SPECT is equipped with specially
More pinhole collimators can design suitable pin hole amplification factor and pin hole arrangement mode, obtain by reducing visual field
Obtain higher detection efficient and better spatial resolution.Therefore spininess hole SPECT imaging systems are current emission tomographies
One important development direction of technology.
However, more pinhole collimators are applied to clinic, there is still a need for overcome some problems:Although the mesh of more pinhole collimators
It is human body organella to mark the visual field, but the radioactive ray from other positions of human body may also on the detector be generated by pin hole
Projection can reduce reconstructed spatial resolution or be difficult to reconstruct conjunction if the projection of this part and the projection of organella occur to overlap
Manage image;In order to obtain higher detection efficient, the pinhole aperture needs of more pinhole collimators design it is bigger, at this moment due to
The influence of pin hole projection penumbra region can cause projection overlapping more serious;Thickness by increasing collimator plate can be to a certain degree
Reduce penumbra region, but blocked up collimator so that material cost is high and difficulty of processing is big, can not apply in practice.
It is a kind of as a result, to can effectively eliminate in more pinhole collimators the overlapping of different pin holes projections, take into account detection efficient, sky
Between the collimator of resolution ratio and reconstructed image quality require study.
Invention content
The present invention is directed at least solve one of the technical problems existing in the prior art.For this purpose, one object of the present invention
It is to propose a kind of collimator for detector, by top plate to carrying out secondary screening across the radioactive ray of imaging through-hole
Gear, effectively reduces overlapping between the projection of different pin holes, and the detection efficient of detector and spatial resolution is made to significantly improve,
Reconstructed image quality is more preferable.
According to an aspect of the present invention, the present invention provides a kind of collimators for detector.It is according to the present invention
Embodiment, the collimator include:Bottom plate is provided with the imaging through-hole in array distribution, the imaging through-hole packet on the bottom plate
Containing the first hole section and the second hole section, and the lateral dimension of first hole section is gradual along the direction of free end to second hole section
Reduce, the lateral dimension of second hole section is gradually reduced along free end to the direction of first hole section;Shielding ring, the screen
Circle is covered to be formed on the bottom plate;And top plate, the top plate is arranged in the shielding ring, and closes the shielding ring extremely
Small part is open, and the shielding through-hole in array distribution is provided on the top plate, and the imaging through-hole and the shielding are logical
Hole is arranged in a one-to-one correspondence.
Collimator according to the ... of the embodiment of the present invention, by top plate to carrying out secondary screening across the radioactive ray of imaging through-hole
Gear effectively reduces overlapping also, logical by the distance between condition top plate and bottom plate and imaging between the projection of different pin holes
The parameter in hole and shielding through-hole, thus it is possible to vary the ratio of shading rate.In turn, make detection efficient and the spatial resolution of detector aobvious
It writes and improves, reconstructed image quality is more preferable.In addition, the processing cost of the collimator is low, application easy to spread.
In addition, collimator according to the above embodiment of the present invention can also have following additional technical characteristic:
According to an embodiment of the invention, first hole section and second hole section are symmetrical arranged in the up-down direction.
According to an embodiment of the invention, first hole section and second hole section independently are round platform or more terrace with edges.
According to an embodiment of the invention, the shielding through-hole is straight hole or inclined hole.
According to an embodiment of the invention, the lower edge of the shielding through-hole and anchor ring where the inner wall of first hole section
Elongated surfaces are overlapped with the intersection of the lower surface of the top plate.
According to an embodiment of the invention, the shading rate of the collimator is not more than 10%, wherein the shading rate is to be based on
What following equation determined,
Wherein, S1Represent the penumbra region projected area of the collimator;S2Represent this shadow zone perspective plane of the collimator
Product;H represents the center of the imaging through-hole to the distance of the detector surface;α represents the cornerwise folder of the imaging through-hole
Angle;D represents the maximum diameter of hole of the imaging through-hole;T represents the bottom surface of the bottom plate to the distance of the top surface of the top plate.
According to an embodiment of the invention, the thickness of the top plate and the bottom plate is not less than 3.5 millimeters.According to the present invention
Preferred embodiment, the thickness of the bottom plate is 10-14 millimeter, and the thickness of the top plate is 2-6 millimeters.
According to an embodiment of the invention, the aperture of the shielding through-hole is 3-6 millimeters.Preferred implementation according to the present invention
The aperture of example, the shielding through-hole is 4.5 millimeters.
On this basis, present invention further proposes detectors.According to an embodiment of the invention, before which includes
The collimator stated.The detection efficient and spatial resolution of the detector are high as a result, and reconstructed image quality is good.Wherein, it needs to illustrate
, all technical features and technique effect of the collimator with aforementioned collimator, this is no longer going to repeat them.
According to an embodiment of the invention, the detector is variable angle dual detectors.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obviously, or practice through the invention is recognized.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination following accompanying drawings to embodiment
Obviously and it is readily appreciated that, wherein:
Fig. 1 shows the partial structural diagram of collimator according to an embodiment of the invention;
Fig. 2 shows the structural schematic diagram of bottom plate according to an embodiment of the invention;
Fig. 3 shows the structural schematic diagram of bottom plate longitudinal section according to an embodiment of the invention;
Fig. 4 shows the structural schematic diagram of top plate according to an embodiment of the invention;
Fig. 5 shows the schematic diagram of existing collimator shading principle;
Fig. 6 shows the result schematic diagram of shading rate according to an embodiment of the invention;
Fig. 7 shows the structural schematic diagram of the longitudinal section of top plate according to an embodiment of the invention;
Fig. 8 shows the schematic diagram of the shading principle of collimator according to an embodiment of the invention;
Fig. 9 shows the schematic diagram of the shading result of collimator according to an embodiment of the invention;
Figure 10 shows the schematic diagram of the shading result of collimator according to an embodiment of the invention;
Figure 11 shows the schematic diagram of dual detectors imaging according to an embodiment of the invention.
Specific implementation mode
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the present invention, term " longitudinal direction ", " transverse direction ", "upper", "lower", "front", "rear", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom" is to be based on the orientation or positional relationship shown in the drawings, and is only
For ease of description the present invention rather than require the present invention must be with specific azimuth configuration and operation, therefore should not be understood as pair
The limitation of the present invention.
It should be noted that term " first ", " second " are used for description purposes only, it is not understood to indicate or imply phase
To importance or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be with
Express or implicitly include one or more this feature.Further, in the description of the present invention, unless otherwise saying
Bright, the meaning of " plurality " is two or more.
Collimator
According to an aspect of the present invention, the present invention provides a kind of collimators for detector.According to of the invention real
The collimator for applying example blocks by the way that top plate is secondary to the radioactive ray progress across imaging through-hole, effectively reduces different pin holes
It is overlapping between projection, also, by adjusting the distance between top plate and bottom plate and being imaged the parameter of through-hole and shielding through-hole,
The ratio of shading rate can be changed.In turn, the detection efficient and spatial resolution for making the imaging system of detector significantly improve, weight
It is more preferable to build picture quality.In addition, the processing cost of the collimator is low, application easy to spread.
For the ease of understanding the collimator, the collimator of the embodiment of the present invention is explained with reference to figure 1-9, the standard
Directly device root may include:Bottom plate 100, shielding ring 200 and top plate 300.Each component of the collimator is specifically described below:
Bottom plate 100:As shown in Figures 2 and 3, according to an embodiment of the invention, be provided on bottom plate 100 in array distribution at
As through-hole 110, which includes the first hole section 111 and the second hole section 112, and the lateral dimension edge of the first hole section 111
Free end is gradually reduced to the direction of second hole section, and the lateral dimension of the second hole section 112 is along free end to the first hole section 111
Direction be gradually reduced.In other words, the center position of the first hole section 111 and the second hole section 112 from free end to bottom plate, laterally
Size is gradually reduced.Inventor has found, compared with using a through hole section, the imaging through-hole 110 of the embodiment of the present invention uses two
A through hole section can increase the thickness of material at lateral dimension minimum, reduce intensity of the ray from the partial penetration.
Wherein, the property of the first hole section 111 and the second hole section 112 can be symmetrical, can also be asymmetric.Also
It is to say, the shape of the first hole section 111 and the second hole section 112 highly may be the same or different with parameters such as lateral dimensions.
According to a preferred embodiment of the invention, the first hole section 111 and the second hole section 112 are symmetrical arranged in the up-down direction.
According to an embodiment of the invention, the direction (i.e. circular cone axis direction) of different imaging through-holes 110 is directed toward different sides
To all directions converge in the center of visual field.Hereby it is achieved that imaging of the different imaging through-holes to same visual field, it can
Projection of the object to be imaged in different angle is obtained simultaneously and for rebuilding.
According to an embodiment of the invention, the first hole section 111 and the second hole section 112 can independently be round platform or more terrace with edges.
That is, the first hole section 111 and the second hole section 112 can be arbitrarily round platform or more terrace with edges.Wherein, the upper and lower surface of round platform
It can be round, ellipse, can also be other irregular circles.
Shielding ring 200:According to an embodiment of the invention, which is formed on bottom plate 100.Shielding ring hides as a result,
Block the light that collimator is injected from external environment.
Top plate 300:With reference to figure 4, according to an embodiment of the invention, which is arranged in shielding ring 200, and closes
Shielding ring 200 it is at least partially open, and the shielding through-hole 310 in array distribution is provided on the top plate 300, and the imaging is logical
Hole 310 and shielding through-hole 110 are arranged in a one-to-one correspondence.That is, top plate 300 is oppositely arranged on the top of bottom plate 100, and week
Side is located in shielding ring 200.It blocks by the way that top plate is secondary to the radioactive ray progress across imaging through-hole, effectively subtracts as a result,
It is overlapping between small difference pin hole projection, also, by adjusting the distance between top plate and bottom plate and imaging through-hole and shielding
The parameter of through-hole, thus it is possible to vary the ratio of shading rate.In turn, the detection efficient and spatial resolution for making detector significantly improve,
Reconstructed image quality is more preferable.
According to an embodiment of the invention, bottom plate 100 and top plate 300 are arranged in parallel.Structure design and conveniently can be simplified as a result,
Assembling.
Here, the shading principle for being further aligned straight device is explained, as shown in figure 3, usually, the target visual field
In the region that pin hole subtended angle ɑ is covered, but the angle of practical acceptable radioactive ray incidence is β, wherein when pin hole direction
There is following relationship when vertical with the first tablet, between ɑ, β:
Wherein,
α represents the midpoint of the joint face of first hole section and second hole section to the folder of first hole section free end
Angle;
β represents imaging 110 cornerwise angle of through-hole;
T0Represent the thickness of bottom plate 100, that is, T0=T1+T2;
D represents the maximum radial dimension of the joint face of first hole section and second hole section;
The drop shadow spread of this shadow zone and penumbra region as figure 5 illustrates, the projected area that ɑ subtended angles are covered in this shadow zone i.e. Fig. 5
The region that β subtended angles are covered in domain, penumbra region i.e. Fig. 5 subtracts the remaining area in this shadow zone.In this case, detector
The projection in this existing shadow zone has the projection of penumbra region again in 600 planes, and the shape of projection is circle.By this shadow zone projected area
Use S2It indicates, penumbra region projected area S1It indicates, in T1In the case of=0, the ratio of the two meets following relationship:
Wherein,
S1The penumbra region projected area of collimator is represented, that is, the region that β subtended angles are covered in Fig. 5 subtracts this shadow zone
The area of remaining area;
S2Represent this shadow zone projected area of collimator, that is, the view field that ɑ subtended angles are covered in Fig. 5 area;
H represents the center of imaging through-hole 110 to the distance of detector surface;
α represents the midpoint of the joint face of the first hole section 111 and the second hole section 112 to the angle of 111 free end of the first hole section;
D represents the maximum diameter of hole of imaging through-hole 110;
T represents the bottom surface of bottom plate 100 to the distance of the top surface of top plate 300.
Wherein, shading rate is penumbra region projected area S1With this shadow zone projected area S2Ratio, shading rate is with collimation
The variation relation of device thickness is as shown in Figure 6.It will be appreciated from fig. 6 that in order to make penumbra region area be reduced to 10% left side of this shadow zone area
The right side, that is, shading rate are 10%, and the thickness of collimator will at least reach about 80mm.The material for usually making collimator all compares
Costliness, and some materials (such as tungsten) difficulty of processing is big, it is unrealistic using thick collimator.Inventor has found under study for action, leads to
Cross setting top plate 300 carry out it is secondary block, that is, realize the work of barn door 400 in Fig. 5 jointly by bottom plate 100 and top plate 300
With that is, bottom plate 100, top plate 300 and part between the two collectively form the barn door 400 in Fig. 5, it is thus possible to significantly subtract
The thickness of platter 100 and top plate 300, also, the thickness of bottom plate 100 and top plate 300, between bottom plate 100 and top plate 300 away from
From and the imaging through-hole 110 of different shape and size and shielding through-hole 310, different design requirements can be met, have very
Big flexibility.
In one embodiment of the invention, as shown in figure 4, there is 12 oval shielding through-holes 310 on top plate 300,
It is corresponded with the imaging through-hole 110 on bottom plate.
As shown in fig. 7, according to an embodiment of the invention, according to an embodiment of the invention, shielding through-hole 310 be straight hole (such as
Shown in Fig. 7 A) or inclined hole (as shown in Figure 7 B).Inclined hole, which is changed to straight hole, can be more convenient to be processed, and the influence to occlusion effect can
To ignore, those skilled in the art can voluntarily choose according to processing difficulty.
Further, the penumbra region for being sized and dimensioned to block image pinhole as much as possible of slotted eye projects again not
The projection in this shadow zone is influenced, occlusion effect is as shown in Fig. 8, Fig. 9 and Figure 10.In Fig. 10, the penumbra region on imaging detector is very
It is small, hardly occur with this adjacent shadow zone overlapping.Inventor is the study found that when the lower edge and the first hole of shielding through-hole 310
When the elongated surfaces of anchor ring are overlapped with the intersection of the lower surface of top plate 300 where the inner wall of section 111, that is, the first hole section 111
The figure that the elongated surfaces of anchor ring where inner wall intersect the formation with the lower surface of top plate 300 also just constitutes shielding through-hole 310
Lower edge, at this point, shading rate is small, penumbra region S1Area close to zero.
Furthermore, it is necessary to explanation, the imaging of the distance between bottom plate 100 and top plate 300 and different shape and size
Through-hole 110 and shielding through-hole 310, can be adjusted according to different design requirements, have prodigious flexibility.Thus can
The projection that additional certain angles are selectively carried out to the ray from non-targeted organ is additionally blocked, and is not desired to masking
It wants or data influential on picture quality, so that the detection efficient of detector and spatial resolution is significantly improved, reconstruction image matter
Amount is more preferable.
As previously discussed with respect to existing collimator, the equivalent thickness of the collimator of the embodiment of the present invention is bottom plate 100
Bottom surface that is, is equivalent to 100 and of the thickness of bottom plate 100, the thickness of top plate 300 and bottom plate to the distance of the top surface of top plate 300
The sum of the distance between top plate 300 three.According to formula (2) and set shading rate S1/S2After value finds out D, two pieces of tablets
The distance between the first tablet can be subtracted by D the thickness of thickness and the second tablet determine.
In an embodiment of the present invention, bottom plate 100, top plate 300 and shielding part 200 can be by gold, tantalum, platinum, tungsten and lead
At least one formation.
Further, in a preferred embodiment of the invention, bottom plate 100, top plate 300 and shielding part 200 can be by identical
The formation of material.
Herein, it should be noted that the thickness of bottom plate 100 and top plate 300 needs to ensure not penetrated by ray, if ray
Energy is 140keV, and plate material is tungsten, and setting tablet at least blocks 99.999% ray, then the minimum thickness T of tablet can
To be found out with following formula,
Wherein μ=3.268mm-1, it is linear attenuation coefficient of the material of tungsten to energy 140keV photons.
Correspondingly, according to an embodiment of the invention, the thickness of top plate 300 and bottom plate 100 is not less than 3.5 millimeters.As a result,
Ray can be effectively blocked, prevents from being shot through by ray.
Meanwhile in order to ensure that the ray through an imaging through-hole 110 can only reach a corresponding shielding through-hole 310,
The thickness of bottom plate cannot be too thin.According to a preferred embodiment of the invention, the thickness of bottom plate 100 is 10-14 millimeters, top plate 300
Thickness is 2-6 millimeters.The thickness of bottom and top is suitable as a result, is imaged the ray of through-hole and can only reach corresponding one
A shielding through-hole, shading rate is lower, and the detection efficient and spatial resolution of detector significantly improve, and reconstructed image quality is more preferable.
Specifically, according to a preferred embodiment of the invention, the aperture of shielding through-hole 310 is 3-6 millimeters.It is according to the present invention
The aperture of preferred embodiment, shielding through-hole 310 is 4.5 millimeters.The aperture of shielding through-hole is suitable as a result, is imaged the ray of through-hole
Corresponding shielding through-hole can only be reached, shading rate is lower.
According to an embodiment of the invention, which further comprises support element 500, which is arranged in top plate
Between 300 and bottom plate 100, it is used to support fixed top plate 300 and bottom plate 100.
According to an embodiment of the invention, which can also be formed by at least one of tungsten, lead, gold, platinum and tantalum
's.Further, which can also be formed with top plate 300 and bottom plate 100 using same material.
Detector
On this basis, present invention further proposes detectors.According to an embodiment of the invention, before which includes
The collimator stated.The detection efficient and spatial resolution of the detector are high as a result, and reconstructed image quality is good.It is according to the present invention
Embodiment, installing the dual detectors of aforementioned collimator can carry out fault imaging to human body organella without rotation and move
State fault imaging.Wherein, it should be noted that the collimator has all technical features and technique effect of aforementioned collimator,
This is no longer going to repeat them.
Furthermore, it is necessary to explanation, the detector of the embodiment of the present invention is particularly suited for being heart, first shape to human body organella
Gland or brain are imaged, but the purposes of the detector be not limited to that human body organella can be carried out fault imaging and dynamic tomography at
Picture can also carry out fault imaging and dynamic fault imaging to some organs and internal organs of animal and other can be sent out with this
The object that the detector of bright embodiment is imaged may be applicable to the detector of the embodiment of the present invention.
According to an embodiment of the invention, detector is variable angle dual detectors.As shown in figure 11, as dual probe
The schematic diagram that SPECT is imaged human body organella.Spininess hole SPECT imaging devices with collimator 10 above-mentioned, two
A detector placement in a certain angle, visual field are located between the angle of two detectors, and all pin holes can cover one
Include the spherical visual field of heart area enough.The SPECT imaging devices can reach very high sensitivity as a result, for example, being not necessarily to
Rotation can realize heart fast tomographic imaging, and particularly, which can also realize the dynamic imaging to heart.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiments or example in can be combined in any suitable manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that:Not
In the case of being detached from the principle of the present invention and objective a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The range of invention is limited by claim and its equivalent.
Claims (10)
1. a kind of collimator for detector, which is characterized in that including:
Bottom plate, the imaging through-hole in array distribution is provided on the bottom plate, and the imaging through-hole includes the first hole section and second
Hole section, and the lateral dimension of first hole section is gradually reduced along free end to the direction of second hole section, second hole
The lateral dimension of section is gradually reduced along free end to the direction of first hole section;
Shielding ring, the shielding ring are formed on the bottom plate;And
Top plate, the top plate is arranged in the shielding ring, and closes at least partially open of the shielding ring, and the top plate
On be provided with shielding through-hole in array distribution, and the imaging through-hole and the shielding through-hole are arranged in a one-to-one correspondence.
2. collimator according to claim 1, which is characterized in that first hole section and second hole section are in upper and lower
It is symmetrical arranged upwards.
3. collimator according to claim 1, which is characterized in that first hole section and second hole section independently are
Round platform or more terrace with edges.
4. collimator according to claim 1, which is characterized in that the shielding through-hole is straight hole or inclined hole.
5. collimator according to claim 1, which is characterized in that the lower edge of the shielding through-hole and first hole section
Inner wall where the elongated surfaces of anchor ring overlapped with the intersection of the lower surface of the top plate.
6. collimator according to claim 1, which is characterized in that the shading rate of the collimator is not more than 10%, wherein
The shading rate is determined based on following equation,
Wherein,
S1Represent the penumbra region projected area of the collimator;
S2Represent this shadow zone projected area of the collimator;
H represents the center of the imaging through-hole to the distance of the detector surface;
α represents the midpoint of the joint face of first hole section and second hole section to the angle of first hole section free end;
D represents the maximum diameter of hole of the imaging through-hole;
T represents the bottom surface of the bottom plate to the distance of the top surface of the top plate.
7. collimator according to claim 1, which is characterized in that the thickness of the top plate and the bottom plate is not less than
3.5 millimeters, it is preferable that the thickness of the bottom plate is 10-14 millimeters, and the thickness of the top plate is 2-6 millimeters.
8. collimator according to claim 1, which is characterized in that the aperture of the shielding through-hole is 3-6 millimeters, preferably
Ground is 4.5 millimeters.
9. a kind of detector, which is characterized in that including claim 1-8 any one of them collimators.
10. detector according to claim 9, which is characterized in that the detector is sent out for variable angle dual probe single photon
Penetrate computed tomographic apparatus.
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| CN201810409873.6A CN108685591B (en) | 2018-05-02 | 2018-05-02 | Collimator for detector and application thereof |
| JP2021510513A JP7102610B2 (en) | 2018-05-02 | 2019-05-06 | Collimator for detector and its application |
| US17/052,305 US11576633B2 (en) | 2018-05-02 | 2019-05-06 | Collimator for detector and application thereof |
| KR1020207034751A KR102565843B1 (en) | 2018-05-02 | 2019-05-06 | Collimator for detector and its application |
| PCT/CN2019/085728 WO2019210883A1 (en) | 2018-05-02 | 2019-05-06 | Collimator for detector, and application thereof |
| EP19797148.4A EP3811868A4 (en) | 2018-05-02 | 2019-05-06 | Collimator for detector, and application thereof |
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| WO2019210883A1 (en) * | 2018-05-02 | 2019-11-07 | 北京永新医疗设备有限公司 | Collimator for detector, and application thereof |
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