CN104688256B - A kind of PET system and its barrier apparatus - Google Patents
A kind of PET system and its barrier apparatus Download PDFInfo
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- CN104688256B CN104688256B CN201410727829.1A CN201410727829A CN104688256B CN 104688256 B CN104688256 B CN 104688256B CN 201410727829 A CN201410727829 A CN 201410727829A CN 104688256 B CN104688256 B CN 104688256B
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Abstract
A kind of PET system of present invention offer and its barrier apparatus remain the data in the axial visual field to a greater extent, while effectively having blocked the data outside the axial visual field.The barrier apparatus includes several catch of coaxial arrangement, and each axially spaced arrangement of catch, by axial both sides to centre, the internal diameter of each catch is cumulative.The barrier apparatus of the present invention, by axial both sides to centre, the internal diameter of each catch is cumulative, then the internal diameter close to the catch of both sides is smaller, defined by space it is smaller, therefore allow by data volume it is less, so as to effectively block the data outside the axial visual field；And closer to axial center, the internal diameter of catch is bigger, allow by data volume it is also corresponding larger, the data in the axial visual field will not substantially be generated and be blocked, received convenient for detector so that detector only receives useful data, is particularly suitable for 3D PET.
Description
Technical field
The present invention relates to technical field of medical equipment, more particularly to a kind of PET system and its barrier apparatus.
Background technology
3D-PET is low with its drug dose relative to 2D-PET, sweep time is short, high sensitivity and axial uniformity are good
And as the product of current mainstream in the world, these advantages are based on, 2D-PET is gradually eliminated.
But 3D-PET also has the shortcomings that apparent for 2D-PET, i.e. 3D-PET noises are significantly greater than 2D-PET,
These noises are broadly divided into random and shot noise, and the main source of noise is in addition in the axial visual field, also greatly coming
Outside the axial visual field.The axial direction is reference with the axial direction of pet detector 100, is looked up from axis, and pet detector 100 is in
The visual field in scanning range is in the axial visual field, and the visual field being not in its scanning range is the axial visual field
Outside.
For the above situation, PET system is equipped with barrier, to effectively inhibit the number outside the axial visual field and under big ring difference
According to, and then reduce that system is random and shot noise.
But applied to the barrier of tradition 2D-PET, while blocking the event outside the axial visual field, it is also possible to block
Event in the axial visual field in part.
Referring to FIG. 1, Fig. 1 is the cross-sectional view of PET system in the prior art.
In Fig. 1, heavy line indicates that the edge of pet detector 100, barrier are usually coaxially disposed with pet detector 100, every
Grid are with certain thickness ring-shaped structure, and short fine line is to indicate the anchor ring of barrier in side view in Fig. 1
State, the extending direction being open shown in Fig. 1 are the axial direction, and the region inside pet detector frontside edge is described
In the axial visual field.
From figure 1 it appears that in the data in the axial visual field, a part will not be blocked by barrier, and can
It is received by detector 100, as shown in the solid line (i.e. the solid line on right side in Fig. 1) in Fig. 1 in pet detector 100, the part number
It is received according to by the detection block of offside；But some data being in the axial visual field is blocked by barrier, such as Fig. 1
Shown in middle dotted line, which can not be received because of blocking for barrier by the detection block of offside；In addition, being in detector
In data outside the 100 axial visuals field, still some can not be blocked by barrier, and be received by detector 100, in Fig. 1
Left side it is shown in solid.
It is well known that the major function of barrier is the event blocked outside the axial visual field, while not interfering in the axial visual field
Effective reception of event；And in above-mentioned existing PET system, barrier apparatus 200 is the thing that cannot effectively block outside the axial visual field
Part, and the partial event in the axial visual field is produced and is blocked, it can not preferably meet the use demand of detector 100.
Therefore, above-mentioned barrier apparatus 200 can be only applied to 2D-PET, to choose suitable angle, barrier be avoided to block axis
Event into the visual field, while improving its shielding rate to the event outside the axial visual field.If by above-mentioned existing barrier apparatus
200 are applied to 3D-PET, excessive to the generation of the event in the axial visual field can block, cannot be satisfied use demand at all.
To sum up, a kind of PET system and its barrier apparatus how are designed, to retain the number in the axial visual field to a greater degree
According to the technical issues of while effectively blocking the data outside the axial visual field, become those skilled in the art's current urgent need to resolve.
Invention content
The object of the present invention is to provide a kind of PET system and its barrier apparatus, remain the axial visual field to a greater extent
Interior data, while effectively having blocked the data outside the axial visual field.
In order to solve the above technical problems, the present invention provides a kind of barrier apparatus of PET system, including coaxial arrangement is several
Catch, each axially spaced arrangement of catch, by axial both sides to centre, the internal diameter of each catch is cumulative.
The barrier apparatus of the present invention, by axial both sides to centre, the internal diameter of each catch is cumulative, then close to the catch of both sides
Internal diameter it is smaller, defined by space it is smaller, therefore allow by data volume it is less, so as to effectively block the axial visual field
Outer data；And closer to axial center, the internal diameter of catch is bigger, allow by data volume it is also corresponding larger, substantially
Data in the axial visual field will not be generated and be blocked, received convenient for detector.
As it can be seen that by the setting of above-mentioned baffle structure, barrier apparatus of the invention remains the axial visual field to a greater degree
Interior data, and the data outside the axial visual field are blocked, and are received to be detected device so that detector only receives useful
Data, improve detection efficient, be particularly suitable for 3D-PET.
Optionally, each catch is arranged in the position corresponding with the crystal of pet detector seam.
Optionally, each catch is arranged at equal intervals.
Optionally, the axially spaced-apart between the two adjacent catch is the integral multiple at the crystal interval of pet detector.
Optionally, the outer diameter of each catch is equal, or by axial both sides to centre, the outer diameter of each catch is gradually
Increase.
Optionally, each catch is arranged in a ring, and the outer diameter and the difference of internal diameter of each catch are equal.
Optionally, the thickness of each catch is equal.
Optionally, the internal diameter of each catch variation arc-shaped in the axial direction.
Optionally, the arc is arc-shaped, and its radius is by barrier apparatus total length in the axial direction and described
The distance of the lower end inner face of pet detector to the upper end inner face of the catch determines.
The present invention also provides a kind of PET systems, including pet detector to be filled with the barrier being arranged in the pet detector
It sets, the barrier apparatus is barrier apparatus described in any one of the above embodiments.
Due to the present invention PET system have barrier apparatus described in any one of the above embodiments, therefore it is described in any one of the above embodiments every
Technique effect is suitable for the invention PET system caused by grid device, and details are not described herein again.
Description of the drawings
Fig. 1 is the cross-sectional view of PET system in the prior art；
Fig. 2 is the structural schematic diagram of PET system provided by the present invention in a specific embodiment；
Fig. 3 is the dimensional structure diagram of barrier apparatus in PET system shown in Fig. 2；
Fig. 4 is the positive structure schematic of single catch in barrier apparatus shown in Fig. 3；
Fig. 5 is the side structure schematic diagram of PET system provided by the present invention.
In Fig. 1：
Pet detector 100, barrier apparatus 200
In Fig. 2-5：
Catch 1, hollow area 11, entity portion 12, pet detector 2, shutter 21, barrier apparatus 3
Specific implementation mode
Core of the invention is to provide a kind of PET system and its barrier apparatus, remains the axial visual field to a greater extent
Interior data, while effectively having blocked the data outside the axial visual field.
The present invention provides one kind being used for PET system, including pet detector 2 (hereinafter referred to as detector 2) and setting exist
Barrier apparatus 3 in pet detector 2 effectively blocks data outside the axial visual field will pass through barrier apparatus 3, reduce system with
Machine and shot noise so that the data in the axial visual field are effectively received by pet detector 2；Meanwhile the both sides of pet detector 2 are also
Equipped with shutter 21.As shown in Fig. 2, the extending radially inwardly along detector 2 of shutter 21, effectively to block outside the axial visual field
Data, and cooperate with barrier apparatus 3, and then obtain the image being more clear.
As shown in Figures 2 and 3, barrier apparatus 3 of the invention is mainly co-axially located at catch 1 including several, and each catch 1 is equal
Axially spaced arrangement, and by axial both sides to centre, the internal diameter of each catch 1 is cumulative.
Axial, circumferential direction described herein and the orientation such as radial are reference with pet detector 2, i.e. each gear of barrier apparatus 3
Piece 1 is coaxially disposed with pet detector 2, and is arranged along its axially spaced-apart, and the direction of straight line shown in Fig. 3 is the axial direction.
Meanwhile herein also with pet detector 2 to be inside and outside with reference to defining, the direction close to the center of pet detector 2 is
Interior, the direction far from its center be outer, then by the directions of axial two lateral centres it can be appreciated that direction from outside to inside,
I.e. the internal diameter of each catch 1 is cumulative from outside to inside in the axial direction in the application.That is, being positioned close in pet detector 2
The internal diameter of the catch 1 of the heart is larger, and the internal diameter close to the catch 1 of its both sides is smaller.
The region that the internal diameter of each catch 1 encloses constitutes hollow area 11, and the region between internal diameter and outer diameter constitutes its entity portion
12, as shown in Figure 3.By above-mentioned setting, since the internal diameter of each catch 1 is cumulative from outside to inside in the axial direction, that is, it is in outside
The internal diameter of catch 1 is small, and the internal diameter of the catch 1 in inside is big, then being in data outside the axial visual field of pet detector 2 can be by
The entity portion 12 of the catch 1 in outside is effectively blocked, and the data in the axial visual field then can be by between the catch 1 in inside
Gap be transferred to detector 2, or be pierced by by the hollow area 11 of the catch 1 in inside.That is, working as barrier apparatus 3
When catch 1 using the above structure, while effectively blocking the data outside the axial visual field, it can make the number in the axial visual field
According to being effectively received, to " filtering " and valid data are remained, so that detector 2 clearly may be used according to effective data reconstruction
The image leaned on, and then improve the accuracy of diagnosis.
As shown in Fig. 2, in the data in the axial visual field, a part will not be blocked by barrier, and can be detected
Device 2 is received, and as shown in the solid line (i.e. the solid line on right side in Fig. 2) in Fig. 2 in pet detector 2, the partial data is by offside
Detection block is received；Meanwhile compared with prior art, the data in the axial visual field being blocked originally, can also pass through at this time
The hollow area 11 in gap and catch 1 between catch 1 and received by the detection block of offside, as shown in phantom in Figure 2.It is aobvious
So, the data being in outside the axial visual field of detector 2, since outer side-lens 1 is blocked with its entity portion 12, therefore will not be by offside
Detection block receive, as in Fig. 2 left side it is shown in solid.
Further, the spacing of each catch 1 in the axial direction can be equal, or is arranged between each catch 1 according to use demand
Spacing, not equidistant 1 structure of catch of use.
Specifically, catch 1 can be arranged in the position corresponding with the crystal of pet detector 2 seam.It is well known that PET systems
2 structure of generally use bulk of uniting detector, many a block structures form a ring, then constitute entire detector 2 by dozens of ring；
Wherein, each block structure is connected in sequence by several small crystals, and the crystal seam is the gap between adjacent crystal.
When catch 1 setting with crystal stitch corresponding position when, will not to crystal generate block, avoid influence crystal receive
Data.Since crystal is arranged according to data receiver demand, then catch 1 is corresponded in the position that axial crystal stitches, can be with crystalline substance
Body cooperates so that crystal can receive the valid data in the axial visual field, and shield the invalid data outside the axial visual field.
Between adjacent catch 1 interval can be crystal interval integral multiple, the integral multiple can be one times, twice or
Twice of person or more, i.e. interval between adjacent catch 1 can be equal to crystal interval or be twice or more of crystal interval.This
When, the axially spaced-apart between adjacent catch 1 equal can be arranged, so that catch 1 is evenly distributed in the axial visual field so that axis
Data into the visual field are effectively received.
On the basis of the above, the outer diameter of each catch 1 equal can be arranged, can also be cumulative from outside to inside in the axial direction.Such as
Shown in Fig. 3, in wherein a kind of specific implementation mode, the internal diameter and outer diameter of each catch 1 can in the axial direction from outside to inside gradually
Increase, and internal diameter can be identical with the amplitude of variation of outer diameter, or is arranged as required to different internal-and external diameter amplitudes of variation.
Since the internal diameter of each catch 1 is cumulative from outside to inside, when the outer diameter of each catch 1 is equal, the catch 1 in outside exists
Size radially is larger, i.e., the entity portion 12 that outer side-lens 1 has area larger, then the data outside the axial visual field substantially can
It is enough to be blocked completely by the entity portion 12 of outer side-lens 1, without being received by detector 2；At this point, by many factors such as angles
It influences, the data outside the axial visual field can not be incident on the hollow portion of outer side-lens 1 at all so that the face that outer side-lens 1 is enclosed
The smaller hollow area 11 of product can only be passed through for the data in the axial visual field.
Correspondingly, the catch 1 in outside blocks the invalid data outside the axial visual field, and the catch 1 in inside needs
Meet data in the axial visual field by demand, then its internal diameter can be increased by being in the catch 1 of inside so that more data
It is received by detector 2 through the hollow area 11 of its inside.
In another embodiment specific implementation mode, the internal diameter of each catch 1 and outer diameter can also be cumulative from outside to inside, i.e., by axis
To both sides to centre, the internal diameter and outer diameter of each catch 1 cumulative can be arranged.As needed, internal diameter and outer diameter be in the axial direction
Amplitude of variation may be the same or different, i.e. the area in the entity portion 12 of each catch 1 can be adjusted according to demand,
And 1 diametrical internal diameter of catch and outer diameter size are adjusted, and then the data outside the axial visual field are effectively blocked, while retaining axial direction
Data in the visual field.
Incorporated by reference to Fig. 4, catch 1 can be arranged in a ring, and the difference of the outer diameter of each catch 1 and internal diameter can be equal, i.e., respectively
The width h for the ring that catch 1 is in is equal.The width h of the ring refers in the annular that catch 1 is presented, and entity portion 12 is in radial direction
On width, that is, the outer diameter and internal diameter difference.
When the width h in the entity portion 12 of each catch 1 is equal, the data volume blocked is only related to its diameter, can be with
By controlling the diameter adjustment of catch 1 its data for being blocked, and then effectively improve the performance of barrier.Furthermore using the structure,
The area of catch 1 can be effectively reduced, and then reduces difficulty of processing and 1 material requested of catch, reduces processing cost；Meanwhile it can
By the position for adjusting inner side and outer side catch 1, can also effectively be blocked outside the axial visual field while reducing 1 area of catch
Data.
Furthermore the thickness of each catch 1 can also be equal, i.e. the size of catch 1 in the axial direction, convenient for catch 1 processing and
Setting.
Further, the difference of the outer diameter of each catch 1 and internal diameter can be 58~62mm, i.e., entity portion on each catch 1
12 width h can be 58~62mm, it is preferable that it specifically could be provided as 60mm.Using the catch 1 of the width, can borrow
It helps the entity portion 12 of catch 1 effectively to block the data outside the axial visual field, and can be matched with detector 2, avoid shadow
Ring reception of the detector 2 to valid data.
In addition, the thickness of each catch 1 can be 0.8~1.2mm, preferably can be 1mm, this thickness substantially will not
Influence passing through for data in the axial visual field, and manufacture easy to process.
On the basis of the above, the internal diameter of each catch 1 in the axial direction can be arc-shaped from outside to inside incremented by successively, in other words,
The internal diameter of each catch 1 then can smoothly be connected the inner end of each catch 1 by curve with arc-shaped variation tendency successively in the axial direction
It connects, you can form the arc structure that radius is R, as shown in Figure 5.
With reference to Fig. 5, the determination of the diameter of catch 1 involved in the present invention is illustrated.
As shown in figure 5, for the axis surveys view of detector 2, the central point that O points are the axial visual field is defined, Diff is detector 2
The lower end of inner face is to the distance of the upper end of 1 inner face of catch, DdetAnd DFOVIt is the internal diameter and annular detector of annular detector 2 respectively
The diameter of 2 scanning holes surrounded, R are formed the radius of arc by barrier apparatus 3 in the axial direction, and L is barrier apparatus 3 in axial direction
On total length, RRingFor the internal diameter of annular detector 2, l is distance of the annular baffle 1 apart from axial center point O, then with axial direction
Central point O is in the outer diameter D of the catch 1 of distance llFor：
Wherein
As it can be seen that the internal diameter of each catch 1 is arc-shaped variation in the axial direction, and the radius R of the circular arc is true by Diff and L
It is fixed, the variation can actually ensure barrier apparatus 3 made of being arranged in the axial direction by several catch 1 have both barrier and by work(
Can, i.e., while effective barrier axially regards field data, allows the data in the axial visual field to pass through, only received convenient for detector 2
Valid data.
It should be noted that in Fig. 5 herein, for ease of showing and indicating, the structure that catch 1 is in lower part is hidden
It goes, but convenient only for expression herein, does not indicate that any restriction to 3 structure of barrier apparatus.
It further illustrates, the component of PET system is more, and structure is complex, is only carried out herein to its barrier apparatus 3
It is described in detail, place refers to the prior art to the greatest extent for other, and details are not described herein again.
PET system provided by the present invention and its barrier apparatus are described in detail above.Tool used herein
Principle and implementation of the present invention are described for body example, and the explanation of above example is only intended to help to understand this hair
Bright core concept.It should be pointed out that for those skilled in the art, before not departing from the principle of the invention
It puts, can be with several improvements and modifications are made to the present invention, these improvement and modification also fall into the guarantor of the claims in the present invention
It protects in range.
Claims (6)
1. a kind of barrier apparatus of PET system, includes several catch (1) of coaxial arrangement, each catch (1) is axially spaced
Arrangement, which is characterized in that by axial both sides to centre, the internal diameter of each catch (1) is cumulative；
The internal diameter of each catch (1) is arc-shaped in the axial direction, and overall length of its radius by barrier apparatus (3) in the axial direction
The distance of degree and the lower end inner face of pet detector (2) to the upper end inner face of the catch (1) determines；
By axial both sides to centre, the outer diameter of each catch (1) is cumulative；
Each catch (1) is arranged in a ring, and the outer diameter and the difference of internal diameter of each catch (1) are equal.
2. barrier apparatus as described in claim 1, which is characterized in that each catch (1) setting with pet detector (2)
The corresponding position of crystal seam.
3. barrier apparatus as claimed in claim 2, which is characterized in that each catch (1) is arranged at equal intervals.
4. barrier apparatus as claimed in claim 3, which is characterized in that the axially spaced-apart between the two adjacent catch (1)
For the integral multiple at the crystal interval of pet detector (2).
5. barrier apparatus as described in claim 1, which is characterized in that the thickness of each catch (1) is equal.
6. a kind of PET system includes the barrier apparatus (3) of pet detector (2) and setting in the pet detector (2),
It is characterized in that, the barrier apparatus (3) is the claims 1-5 any one of them barrier apparatus (3).
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| CN201410727829.1A CN104688256B (en) | 2014-12-03 | 2014-12-03 | A kind of PET system and its barrier apparatus |
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| CN201410727829.1A CN104688256B (en) | 2014-12-03 | 2014-12-03 | A kind of PET system and its barrier apparatus |
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| CN104688256A CN104688256A (en) | 2015-06-10 |
| CN104688256B true CN104688256B (en) | 2018-10-02 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5291021A (en) * | 1991-07-01 | 1994-03-01 | Hamamatsu Photonics K.K. | Positron computed tomography scanner |
| CN1910475A (en) * | 2004-01-15 | 2007-02-07 | 皇家飞利浦电子股份有限公司 | Asymmetric axial filter for pet imaging systems |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH068857B2 (en) * | 1989-09-29 | 1994-02-02 | 浜松ホトニクス株式会社 | Positron CT system |
| JPH0627821B2 (en) * | 1990-02-06 | 1994-04-13 | 浜松ホトニクス株式会社 | Positron CT system |
| JP2006017532A (en) * | 2004-06-30 | 2006-01-19 | Ge Medical Systems Global Technology Co Llc | Pet device and its detector unit |
| JP2012177555A (en) * | 2011-02-25 | 2012-09-13 | Hitachi Ltd | Radiation imaging apparatus |
-
2014
- 2014-12-03 CN CN201410727829.1A patent/CN104688256B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5291021A (en) * | 1991-07-01 | 1994-03-01 | Hamamatsu Photonics K.K. | Positron computed tomography scanner |
| CN1910475A (en) * | 2004-01-15 | 2007-02-07 | 皇家飞利浦电子股份有限公司 | Asymmetric axial filter for pet imaging systems |
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Address after: 110179 No. 177-1 Innovation Road, Hunnan District, Shenyang City, Liaoning Province Patentee after: Shenyang Neusoft Medical Systems Co.,Ltd. Address before: Hunnan New Century Road 110179 Shenyang city of Liaoning Province, No. 16 Patentee before: SHENYANG NEUSOFT MEDICAL SYSTEMS Co.,Ltd. |
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Effective date of registration: 20230410 Address after: Room 308, No. 177-2 Chuangxin Road, Hunnan District, Shenyang City, Liaoning Province, 110167 Patentee after: Shenyang Zhihe Medical Technology Co.,Ltd. Address before: 110179 No. 177-1 Innovation Road, Hunnan District, Shenyang City, Liaoning Province Patentee before: Shenyang Neusoft Medical Systems Co.,Ltd. |