CN208573739U - PET/MR imaging system - Google Patents
PET/MR imaging system Download PDFInfo
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- CN208573739U CN208573739U CN201721900975.5U CN201721900975U CN208573739U CN 208573739 U CN208573739 U CN 208573739U CN 201721900975 U CN201721900975 U CN 201721900975U CN 208573739 U CN208573739 U CN 208573739U
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Abstract
The utility model relates to a kind of PET/MR imaging system, the imaging system include: the pet detector being arranged between body transmitting coil and gradient coil and be coated on pet detector periphery and magnetic susceptibility be not equal to 1 shielding shimming shell；Shielding shimming shell is used to adjust magnetic field's regularity caused by the main magnet in imaging system, and the radiofrequency signal for the transmitting of shield transmitting coil.PET/MR imaging system provided by the utility model, shielding shimming shell using magnetic susceptibility not equal to 1 is coated on the periphery of pet detector, for adjusting magnetic field's regularity caused by the main magnet in imaging system, it no longer needs to additionally increase shimming item in gradient coil, it can realize the shimming that the magnetic field generated for main magnet carries out, the aperture of sufficiently large patient's imaging region can be reserved to patient in this way, the biggish patient of figure or patient with other mental diseases can also enter scanning space, improve the applicability of imaging system.
Description
Technical field
The utility model relates to Medical Imaging Technology fields, more particularly to a kind of PET/MR imaging system.
Background technique
With the continuous development of medical technology, by magnetic resonance (magnetic resonance, MR) scanner and PET
(Positron Emission Tomography, positron emission tomography) scanner be mixed into hybrid imaging system by
Gradually by the favor of medical domain.In actual use, in order to avoid the body transmitting coil in hybrid imaging system is sent out
The work of the outside radiation effect peripheral parts (especially pet detector) of radiofrequency signal out, the hybrid imaging system is in PET
The periphery of the pet detector of scanner is provided with shielding case.But the setting of the shielding case, although can be avoided radiofrequency signal to
External radiation, but its magnetic field's regularity for leveraging main magnet in hybrid imaging system, thus largely
Disturb magnetic resonance imaging.
To solve the above problems, usually by the way that shimming item is arranged in gradient coil, passing through the shimming in traditional technology
Item comes the magnetic field that balanced main magnet generates.But in actual use, in order to which the magnetic field for generating main magnet becomes uniformly,
Increased shimming item thickness it is thicker, occupy the above-mentioned limited design space of hybrid imaging system in this way, and make pre-
The available space for leaving the aperture of patient's imaging region for reduces, and leads to the biggish patient of some figures or with other psychological diseases
The patient of sick (such as claustrophobia) cannot be introduced into scanning space, and applicability is lower.
Utility model content
Based on this, it is necessary to for the lower problem of hybrid imaging system applicability set forth above, provide one kind
PET/MR imaging system.
The utility model provides a kind of PET/MR imaging system, comprising: is arranged between body transmitting coil and gradient coil
Pet detector and be coated on pet detector periphery and magnetic susceptibility be not equal to 1 shielding shimming shell；The shielding is even
Field shell is used to adjust magnetic field's regularity caused by the main magnet in the imaging system, and for shielding the body transmitting
The radiofrequency signal of coil transmissions.
PET/MR imaging system provided by above-mentioned, the shielding shimming shell using magnetic susceptibility not equal to 1 are coated on PET and detect
The periphery of device, shielding shimming shell are applied not only to the radiofrequency signal of shield transmitting coil transmitting, while being also used to adjust imaging system
Magnetic field's regularity caused by main magnet in system, without additionally increasing shimming item in main magnet again, so that it may real
The magnetic field that existing main magnet generates becomes uniformly, can reserve the aperture of sufficiently large patient's imaging region to patient in this way, figure compared with
Big patient or the patient with other mental diseases can also enter scanning space, improve the applicability of imaging system.
It in one of the embodiments, include multiple pet detectors, the periphery of each pet detector is wrapped
Cover a shielding shimming shell.
PET/MR imaging system provided by above-mentioned is not equal to by periphery one magnetic susceptibility of cladding in each detector
1 shielding shimming shell, it greatly improves the efficiency of shimming, and avoid interfering with each other between pet detector.
It in one of the embodiments, include multiple pet detectors, each shielding shimming shell is coated on two or two
The periphery of a above pet detector.
PET/MR imaging system provided by above-mentioned, shielding shimming shell had both shielded the radio frequency letter of above-mentioned body transmitting coil transmitting
Number, and shimming is carried out to the magnetic field that above-mentioned main magnet generates, the use of shimming item is eliminated, so that imaging region be greatly saved
Aperture available space, the aperture for leaving patient's imaging region in this way is larger, can satisfy the biggish patient of figure or trouble
There is the patient of other mental diseases to enter scanning space, improves the applicability of imaging system.
The shielding shimming shell is the screen that conductivity is more than or equal to 5 Siemens/cms in one of the embodiments,
Cover shell.
PET/MR imaging system provided by above-mentioned, shielding shimming shell are that conductivity is more than or equal to 5 Siemens/cms
Shielding case, can magnetic field that preferably uniform main magnet generates, to substantially increase the imaging effect of imaging system.
The shape of the shielding shimming shell is identical as the shape of the pet detector coated in one of the embodiments,；
The volume size of the shielding shimming shell is related to the intensity in the magnetic field that the main magnet generates.
PET/MR imaging system provided by above-mentioned shields the shape of the shape and the pet detector coated of shimming shell
It is identical, identical mold can be used and produced, save process, while also reducing production cost.
The shielding shimming shell includes openable and closable side wall, is arranged in the sidewall bottom in one of the embodiments,
Lower cover and the upper cover body of the top side wall is set；One side of the side wall is provided with card slot, the side wall
Another side be provided with the buckle being adapted to the card slot；The pet detector be located at the side wall, the upper cover body and
In the accommodating cavity that the lower cover is constituted.
PET/MR imaging system provided by above-mentioned, by the way that card slot is arranged on the side wall of shielding shimming shell and is adapted to it
Buckle so that pet detector be easily put into shielding shimming shell and be easy from shielding shimming shell in take out.
The shielding shimming shell includes bent side wall, is arranged in the sidewall bottom in one of the embodiments,
Lower cover and the upper cover body of the top side wall is set；The bottom of the lower cover and the side wall is detachably connected,
The upper cover body is connect with the top side detachable of the side wall.
The side wall of PET/MR imaging system provided by above-mentioned, shielding shimming shell detachably connects with upper cover body and lower cover
It connects, pet detector is facilitated to be put into shielding shimming shell and take out from shielding shimming shell.
The shielding shimming shell is rectangular parallelepiped structure, in cylindrical-shaped structure, triangular prism structure in one of the embodiments,
Any one.
The shielding shimming shell is the shielding case that magnetic susceptibility is greater than 10 in one of the embodiments,.
It opens up fluted on the inner wall of the gradient coil, is embedded in the groove even in one of the embodiments,
Field item.
PET/MR imaging system provided by above-mentioned is embedded with shimming item in the groove that gradient coil inner wall opens up, can be with
More evenly, and shimming item is embedded in the groove of gradient coil inner wall, be will not influence and is kept in the magnetic field for generating main magnet
The size in the aperture of patient's imaging region.
PET/MR imaging system provided by the utility model, the shielding shimming shell using magnetic susceptibility not equal to 1 are coated on PET
The periphery of detector, shielding shimming shell is applied not only to the radiofrequency signal of shield transmitting coil transmitting, while being also used to be adjusted to
The magnetic field's regularity as caused by the main magnet in system, without the additional shimming item increased for main field again, just
The magnetic field that main magnet generation may be implemented becomes uniformly, while the aperture of sufficiently large patient's imaging region, figure are reserved to patient
Biggish patient or patient with other mental diseases can also enter scanning space, improve being applicable in for imaging system
Property.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of PET/MR imaging system；
Fig. 2 is the side view for the PET/MR imaging system that the utility model one embodiment provides；
Fig. 3 is the cross-sectional view of pet detector and the shielding shimming shell for being coated on pet detector periphery in the utility model；
Fig. 4 is the side view for the PET/MR imaging system that another embodiment of the utility model provides；
Fig. 5 is the side view for the PET/MR imaging system that another embodiment of the utility model provides；
The structural representation of shimming shell is shielded in the PET/MR imaging system that Fig. 6 provides for another embodiment of the utility model
Figure；
Another knot of shimming shell is shielded in the PET/MR imaging system that Fig. 7 provides for another embodiment of the utility model
Structure schematic diagram.
Appended drawing reference:
100:PET/MR imaging system；101: main magnet；102: gradient coil；
103: body transmitting coil；104: local coil；105: imaging region；
106: patient bed；108:PET detector；150: imaging object；
201: shielding shimming shell；2011: side wall；2012: lower cover；
2013: upper cover body；2014: card slot；2015: buckle；
2021: side wall；2022: lower cover；2023: upper cover body.
Specific embodiment
With the continuous development of medical technology, by magnetic resonance (magnetic resonance, MR) scanner and PET
(Positron Emission Tomography, positron emission tomography) scanner be mixed into hybrid imaging system by
Gradually by the favor of medical domain.The content of the utility model in order to better understand, now in conjunction with attached drawing 1 to it is above-mentioned it is hybrid at
As the structure of system (PET/MR imaging system) is simply introduced.
As shown in Figure 1, PET/MR imaging system 100 generally includes main magnet 101, gradient coil 102, body transmitting coil
103, local coil 104, pet detector 108 and shielding case (shielding case is being not shown in the figure).Wherein, gradient coil 102 is arranged
In the outer layer of body transmitting coil 103, the outer layer of gradient coil 102 is arranged in main magnet 101, and the setting of local coil 104 is being imaged
The position to be checked of object 150, pet detector 108 is between body transmitting coil 103 and gradient coil 102, and shielding case is set
It sets in the periphery of pet detector 108, for avoiding radiofrequency signal to external radiation.
Wherein, above-mentioned main magnet 101 can be is made of superconducting coil, for generating main field, in some cases
Permanent magnet can be used.In magnetic resonance imaging, imaging object 150 can be carried by patient bed 106, with the shifting of bed board
It is dynamic, imaging object 150 is moved into the more uniform imaging region 105 of 101 Distribution of Magnetic Field of main magnet.It is scanned generally for MR
Device, the direction z of space coordinates (i.e. the coordinate system of equipment) is set as identical as the axial direction of MR scanner rack, by the body of patient
Length direction is consistent with the direction z and is imaged, and the horizontal plane of MR scanner is set as xz plane, and the direction x and the direction z are hung down
Directly, the direction y is vertical with x and z directions.
However, it is desirable to explanation, the setting of above-mentioned shielding case, although can be avoided radiofrequency signal to external radiation,
Its magnetic field's regularity for leveraging main magnet 101 in hybrid imaging system, thus largely disturb magnetic
Resonance image-forming.To avoid the problem, the way of traditional technology is to open multiple shim channels in gradient coil 102, in shim channels
Middle setting shimming item is adjusted the uniformity of the main field of the generation of main magnet 101 by the shimming item, keeps its more uniform.But
Be, in actual use, in order to make main magnet 101 generate magnetic field become uniformly, increased shimming item thickness it is thicker,
And open up shim channels in gradient coil 102 and occupy the design space of hybrid imaging device, this makes in above-mentioned Fig. 1
Body transmitting coil 103 and gradient coil 102 be intended to radially inward contraction, so as to cause originally patient's imaging region was kept for
The available space in 105 aperture reduces, and leads to the biggish patient of some figures or (such as puts under house arrest probably with other mental diseases
Fear disease) patient cannot be introduced into scanning space, applicability is lower.PET/MR imaging system provided by the utility model is intended to solve
The certainly technical problem as above of traditional technology.
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, it by following embodiments and ties
Attached drawing is closed, the technical scheme in the embodiment of the utility model is described in further details.It should be appreciated that tool described herein
Body embodiment only to explain the utility model, is not used to limit the utility model.
Fig. 2 is the side view for the PET/MR imaging system that the utility model one embodiment provides.As shown in Fig. 2, should
PET/MR imaging system includes: the pet detector 108 being arranged between body transmitting coil 103 and gradient coil 102 and packet
Overlay on 108 periphery of pet detector and shielding shimming shell 201 of the magnetic susceptibility not equal to 1；The shielding shimming shell 201 is used for
Magnetic field's regularity caused by the main magnet 101 in the imaging system is adjusted, and for shielding the body transmitting coil
The radiofrequency signal of 103 transmittings.In Fig. 2 with shield shimming shell 201 be hollow cuboid be exemplify, it should be noted that this
Embodiment to shielding shimming shell 201 shape without limitation.Fig. 3 is that the pet detector 108 is detected with the PET is coated on
The cross-sectional view of the shielding shimming shell 201 of 108 periphery of device, Fig. 3 are that hollow cuboid and PET are visited to shield shimming shell 201
It is to exemplify that survey device 108, which be cuboid, it should be noted that the present embodiment is to shielding shimming shell 201 and pet detector 108
Shape is without limitation.
Specifically, gradient coil 102 is the coil for the additional gradient magnetic field in main magnet 101 in the present embodiment.It is real
In the work of border, gradient coil 102 will at least provide three kinds of gradient magnetics, layer needed for being used to corresponding generation magnetic resonance imaging
Face selects gradient, frequency encoding gradient and phase encoding gradient.In addition above-mentioned gradient coil 102 can be conductive metal class material
Matter, such as gold, copper, iron etc. can be tubular structure, and optionally, which can be circular tubular structure, can also
To be rectangular tubular structure, the present embodiment to the concrete shape of tubular structure also without limitation.
On the other hand, above-mentioned body transmitting coil 103 can be conductive metal class material, such as gold, copper, iron etc., can be with
It is tubular structure, optionally, which can be circular tubular structure, be also possible to rectangular tubular structure, this reality
Example is applied to the concrete shape of tubular structure also without limitation, as long as above-mentioned gradient coil 102 can be coated on body transmitting coil 103
Periphery.Optionally, body transmitting coil 103 and the structure of above-mentioned gradient coil 102 can be consistent.
In addition, above-mentioned pet detector 108 is arranged between above-mentioned body transmitting coil 103 and gradient coil 102.Commonly
108 structure of pet detector is the matrix array of BGO (abbreviation of the general name bismuth germanium oxide of Bi2O3-GeO2 based compound) crystal composition
It is coupled in 2 × 2 photomultiplier tube arrays, or is coupled in 2 double photomultiplier tube arrays and is formed by, optionally, also
It can be for the matrix array that BGO crystal forms to be coupled on location-sensitive photomultiplier tube and be formed by structure.Optionally,
The pet detector 108 can be one, can also be to be multiple, and pet detector 108 shown in Figure 2 is only a kind of example.
Further, above-mentioned 108 periphery of pet detector is coated with shielding shimming shell 201, wherein shielding shimming shell 201
Magnetic susceptibility is not equal to 1, can be used for shimming and shields the radiofrequency signal of body transmitting coil 103, optionally, the screen
Carbon steel mixing shielding case can also be used using iron copper mixing shielding case by covering shimming shell 201.The present embodiment is to shielding shimming
The material of shell 201 without limitation, as long as its final magnetic susceptibility be not equal to 1.That is, in the present embodiment, above-mentioned screen
Covering 201 one side of shimming shell can be used in shielding the radiofrequency signal that above-mentioned body transmitting coil 103 emits, and on the other hand can also use
In adjusting magnetic field's regularity caused by the main magnet 101 in the imaging system, it is not necessarily to be arranged in main magnet 101 even
Field item, it is only necessary to changing shielding shimming shell 201 of the magnetic susceptibility not equal to 1 can be realized the function of shielded radio frequency signal and shimming, because
This, is greatly saved the available space in the aperture of imaging region 105, enters convenient for various types of patients, improves imaging
The applicability of system.
Optionally, the magnetic susceptibility for shielding shimming shell 201 is greater than 10, when shielding 201 magnetic susceptibility of shimming shell is bigger, to main magnetic
The shimming effect in the magnetic field that body 101 generates is more preferably.Optionally, shielding shimming shell 201 can use ferromagnetism shielding case, such as silicon
Steel etc..
In the present embodiment, the shielding shimming shell by magnetic susceptibility not equal to 1 is coated on the periphery of pet detector, and the shielding is even
Field shell is applied not only to the radiofrequency signal of shield transmitting coil transmitting, while the main magnet for being also used to adjust in imaging system is produced
Raw magnetic field's regularity, without additionally increasing shimming item in main magnet again, so that it may realize the magnetic that main magnet generates
Become uniformly, can reserve the aperture of sufficiently large patient's imaging region to patient in this way, the biggish patient of figure or suffers from
The patient of other mental diseases can also enter scanning space, improve the applicability of imaging system.
As a kind of possible embodiment of above-described embodiment, above-mentioned shielding shimming shell 201 can be greater than for conductivity
Or the shielding case equal to 5 Siemens/cms, can magnetic field that preferably uniform main magnet generates, to substantially increase
The imaging effect of imaging system.
As the alternatively possible embodiment of above-described embodiment, above-mentioned shielding shimming shell 201 can be hollow length
Cube structure can be hollow cylindrical-shaped structure, be also possible to hollow triangular prism structure, can also be any other energy
Closing accommodates the structure of above-mentioned pet detector 108, the present embodiment to the shape of shielding shimming shell 201 without limitation, above-mentioned Fig. 2
The structure of the shielding shimming shell 201 shown is only a kind of example.
In addition, the shape of above-mentioned shielding shimming shell 201 can be identical with the shape of the pet detector 108 coated, it can also
With difference, as long as shielding shimming shell 201 can envelope pet detector 108.Shape and institute when shielding shimming shell 201
When the shape of the pet detector 108 of cladding is identical, identical mold can be used and produced, process is saved, simultaneously also
Reduce production cost.It should be noted that the volume size of above-mentioned shielding shimming shell 201 and above-mentioned main magnet 101 generated
The intensity in magnetic field is related, and the volume of shielding shimming shell 201 can be specifically determined according to the intensity in the magnetic field that main magnet 101 generates.
Fig. 4 is the side view for the PET/MR imaging system that another embodiment of the utility model provides.In the embodiment,
It include multiple pet detectors 108 in PET/MR imaging system, and one shielding of cladding of the periphery of each pet detector 108 is even
Field shell 201.
It should be noted that in the present embodiment, the shape of multiple pet detectors 108 may be the same or different,
And the shape for being coated on multiple shielding shimming shells 201 of each 108 periphery of pet detector can be the same or different.It can
Choosing, the shape of the shape of multiple pet detectors and the shielding shimming shell for being coated on pet detector periphery can also be identical.Fig. 4
Shown in be only that each 108 shape of pet detector is identical and to be coated on multiple shieldings of 108 periphery of each pet detector even
The shape of shell 201 also identical and pet detector shape and be coated on pet detector periphery shielding shimming shell shape
Also identical a kind of example.
PET/MR imaging system provided in this embodiment is differed by periphery one magnetic susceptibility of cladding in each detector
In 1 shielding shimming shell, it greatly improves the efficiency of shimming, and avoid interfering with each other between pet detector；Separately
Outside, it when the shape of pet detector is identical with the shielding shape of shimming shell for being coated on pet detector periphery, can reduce
The number of die sinking, greatly reduces production process, also reduces the cost of manufacture of imaging system.
Fig. 5 is the side view for the PET/MR imaging system that another embodiment of the utility model provides.In above-described embodiment
On the basis of, optionally, including multiple pet detectors 108, each shielding shimming shell 201 be coated on two or two with
On the pet detector 108 periphery.
It should be noted that in the present embodiment, the shape of multiple pet detectors 108 may be the same or different,
And the shape for being coated on multiple shielding shimming shells 201 of each 108 periphery of pet detector can be the same or different.Fig. 5
Shown in be only that each 108 shape of pet detector is identical and to be coated on multiple shieldings of 108 periphery of each pet detector even
A kind of shape of shell 201 also identical example.
In the present embodiment, shielding shimming shell had not only shielded the radiofrequency signal of above-mentioned body transmitting coil transmitting, but also to above-mentioned main magnetic
The magnetic field that body generates carries out shimming, the use of shimming item is eliminated, so that the available sky in the aperture of imaging region be greatly saved
Between, the aperture for leaving patient's imaging region in this way is larger, can satisfy the biggish patient of figure or with other mental diseases
Patient enter scanning space, improve the applicability of imaging system；In addition, the shape when multiple pet detectors is identical and more
When the shape of a shielding shimming shell is also identical, the number of die sinking can be reduced, production process is greatly reduced, also reduces into
As the cost of manufacture of system.
The structural representation of shimming shell is shielded in the PET/MR imaging system that Fig. 6 provides for another embodiment of the utility model
Figure.The shielding shimming shell of Fig. 6 with cylindric to exemplify, on the basis of the above embodiments, optionally, the shielding shimming shell
201 include openable and closable side wall 2011, the lower cover 2012 that 2011 bottom of side wall is arranged in and setting in the side wall
The upper cover body 2013 at top；One side of the side wall 2011 is provided with card slot 2014, another side of the side wall 2011
While being provided with the buckle 2015 being adapted to the card slot 2014；The pet detector 108 be located at the side wall 2011, it is described on
In the accommodating cavity that lid 2013 and the lower cover 2012 are constituted.It should be noted that above-mentioned buckle 2015 can in the present embodiment
To be arranged one in any end of side wall 2011, it can also respectively be arranged one at the both ends of side wall 2011, it can also be in side wall
2011 centre is configured, the present embodiment to the number of buckle 2015 without limitation, above-mentioned card slot 2014 and above-mentioned buckle
A position is corresponding.Shown in Fig. 6 is only that the buckle 2015 and card slot 2014 to match is arranged in the lower end of side wall 2011
A kind of example.
In the present embodiment, by the buckle that card slot is arranged on the side wall of shielding shimming shell and is adapted to it, so that PET is visited
Device is surveyed to be easily put into shielding shimming shell and be easy to take out from shielding shimming shell.
Another knot of shimming shell is shielded in the PET/MR imaging system that Fig. 7 provides for another embodiment of the utility model
Structure schematic diagram.On the basis of the above embodiments, optionally, the shielding shimming shell 201 includes bent side wall 2021, sets
Set 2021 bottom of side wall lower cover 2022 and the upper cover body 2023 at 2021 top of the side wall is set；Under described
Lid 2022 and the bottom of the side wall 2021 are detachably connected, and the upper cover body 2023 and the top of the side wall 2021 are removable
Unload connection.It should be noted that in the present embodiment, above-mentioned side wall 2011 and above-mentioned upper cover body 2023 and above-mentioned lower cover 2022
Be detachably connected can using pin shaft connection, shaft connection, the present embodiment to above-mentioned side wall 2011 and above-mentioned upper cover body 2023 and
Dismountable connection type of above-mentioned lower cover 2022 is without limitation.On being only above-mentioned side wall 2011 shown in Fig. 7 and being above-mentioned
A kind of example of pin shaft connection is respectively adopted in lid 2023 and above-mentioned lower cover 2022.
In the present embodiment, the side wall of shielding shimming shell is detachably connected with upper cover body and lower cover, facilitates pet detector
It is put into shielding shimming shell and is taken out from shielding shimming shell.
It should be noted that above-mentioned two embodiment only respectively illustrate shielding shimming shell 201 two kinds of structures, above-mentioned two
A embodiment to shielding shimming shell 201 structure without limitation, as long as its periphery that can be coated on pet detector.
Based on any of the above-described embodiment, in the imaging system, opened up on the inner wall of the gradient coil 102 it is fluted,
Shimming item is embedded in the groove, optionally, shimming item can be the 1/5~1/ of the shimming item embedded in existing gradient coil
3.Above-mentioned shimming item can be made of several small coils, and the size of each small coil can be different.It should be noted that this reality
Example is applied to the shape of shimming item without limitation, as long as it may finally can be with shimming to magnetic field caused by main magnet 101.
In the present embodiment, the shimming item embedded in traditional gradient coil need to be only embedded in the groove that gradient coil inner wall opens up
Quantity 1/5~1/3, so that it may more evenly, and shimming item is embedded in gradient coil inner wall in the magnetic field for generating main magnet
Groove in, will not influence the size for keeping for the aperture of patient's imaging region, convenient for various types of patients enter, improve
The applicability of imaging system.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the common of this field
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (10)
1. a kind of PET/MR imaging system characterized by comprising the PET between body transmitting coil and gradient coil is arranged in
Detector and be coated on pet detector periphery and magnetic susceptibility be not equal to 1 shielding shimming shell；
The shielding shimming shell is used to adjust magnetic field's regularity caused by the main magnet in the imaging system, and is used for
Shield the radiofrequency signal of the body transmitting coil transmitting.
2. imaging system according to claim 1, which is characterized in that each described including multiple pet detectors
The periphery of pet detector coats a shielding shimming shell.
3. imaging system according to claim 1, which is characterized in that including multiple pet detectors, each shielding is even
Field shell is coated on the periphery of two or more pet detectors.
4. imaging system according to claim 1-3, which is characterized in that the shielding shimming shell is that conductivity is big
In or equal to 5 Siemens/cms shielding case.
5. imaging system according to claim 4, which is characterized in that the shape of the shielding shimming shell with coated
The shape of pet detector is identical；
The volume size of the shielding shimming shell is related to the intensity in the magnetic field that the main magnet generates.
6. imaging system according to claim 4, which is characterized in that the shielding shimming shell include openable and closable side wall,
The lower cover of the sidewall bottom is set and the upper cover body of the top side wall is set；One side of the side wall is set
It is equipped with card slot, another side of the side wall is provided with the buckle being adapted to the card slot；
The pet detector is located in the accommodating cavity that the side wall, the upper cover body and the lower cover are constituted.
7. imaging system according to claim 4, which is characterized in that the shielding shimming shell include bent side wall,
The lower cover of the sidewall bottom is set and the upper cover body of the top side wall is set；
The bottom of the lower cover and the side wall is detachably connected, and the top side detachable of the upper cover body and the side wall connects
It connects.
8. according to the described in any item imaging systems of claim 5-7, which is characterized in that the shielding shimming shell is hollow length
Cube structure, hollow cylindrical-shaped structure, any one in hollow triangular prism structure.
9. imaging system according to claim 1, which is characterized in that the shielding shimming shell is the screen that magnetic susceptibility is greater than 10
Cover shell.
10. imaging system according to claim 1, which is characterized in that opened up on the inner wall of the gradient coil it is fluted,
Shimming item is embedded in the groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721900975.5U CN208573739U (en) | 2017-12-29 | 2017-12-29 | PET/MR imaging system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721900975.5U CN208573739U (en) | 2017-12-29 | 2017-12-29 | PET/MR imaging system |
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| CN208573739U true CN208573739U (en) | 2019-03-05 |
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