CN101281238A - High resolution vision imaging apparatus for NMR imaging coil of intense magnetic field - Google Patents
High resolution vision imaging apparatus for NMR imaging coil of intense magnetic field Download PDFInfo
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- CN101281238A CN101281238A CNA2007101898873A CN200710189887A CN101281238A CN 101281238 A CN101281238 A CN 101281238A CN A2007101898873 A CNA2007101898873 A CN A2007101898873A CN 200710189887 A CN200710189887 A CN 200710189887A CN 101281238 A CN101281238 A CN 101281238A
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Abstract
Disclosed is a high resolution vision imaging apparatus for MRI coil of the intense magnetic field, specially a high resolution (the resolution factor is larger than or equal to 800*600) vision imaging apparatus for MRI coil of the intense magnetic field (larger than or equal to 1.5tesla). The apparatus can be not only used for clinical patients, but also used for subjects in scientific experiment. The vision imaging apparatus disclosed by the invention includes a high resolution vision imaging module which can be normally used in the MRI coil of the intense magnetic field. In the prior known patents, the module can only locate in the MRI magnetic cavity rather than in the MRI coil, and the optical devices are located in the coil. The vision imaging apparatus disclosed by the invention also includes an image receiving module which can be normally used in the intense magnetic field. Furthermore, the vision imaging apparatus disclosed by the invention also includes connecting lines connecting the vision imaging module and the image receiving module which can be normally used in the intense magnetic field and the MRI magnetic cavity of the intense magnetic field. Meanwhile, the vision imaging apparatus disclosed by the invention will not affect the normal use of the MRI apparatus.
Description
Technical field
This patent is high resolving power (resolution is more than or equal to the 800X600) vision imaging apparatus that is used for the MRI coil of high-intensity magnetic field (more than or equal to 1.5 Tesla) about a kind of.
Background technology
The vision imaging apparatus that is used for MRI high-intensity magnetic field (more than or equal to 1.5 Tesla) at present is used for clinical or is used for scientific experiment all is (for example U.S. Pat Patent:5412419,5432544,5877732,6774929) that is positioned at outside the coil.These equipment will be presented on image outside the coil by optical device and be presented on the clinical patient that is arranged in coil or scientific experiment experimenter at the moment.These optical device can be that lens combination (for example U.S. Pat Patent:5412419,5432544,5877732) also can be fiber optic high-resolution (for example U.S. Pat Patent:6774929).Such equipment all compares clumsiness, is difficult to install and use.Clinical and scientific experiment press for a kind of light be easy to install and use can be used for vision imaging apparatus in the coil.Yet because equipment is in the high-intensity magnetic field, powerful magnetic field (more than or equal to 1.5 Tesla) will make conventional electronic imaging device normally not use.The conventional electrical imaging device also can exert an influence to the operate as normal of MRI equipment simultaneously.Thereby this patent will address these problems make a kind of compact and portable be easy to install and use can be used for that vision imaging apparatus becomes possibility in the coil.
Summary of the invention
Because our equipment needs normally operation in high-intensity magnetic field (more than or equal to 1.5 Tesla), therefore need take special measure that it can be moved in the special environment of this kind to the electronic equipment of routine:
(1) at first the image receiver module need carry out magnetic shielding.Can take double-deck magnetic shielding to this, promptly take high saturated magnetic shielding material, as silicon steel at skin; And internal layer adopts the magnetic shielding material of high magnetic permeability, as the Mumetal alloy.Thereby double-deck magnetic shielding effectively shielding strong magnetic field is normally used the image receiver module.
(2) because coil produces improper electric current in high-intensity magnetic field, the circuit that contains telefault will redesign the circuit that contains inductance with removal.Take this measure can make extra small screen device (microdisplay) can be in high-intensity magnetic field normally use (as take, put on, adjustment etc.) and unlikely damage.The power of present extra small screen device (microdisplay) is very little (general only in hundreds of microwatt (mW) level, for example the extra small screen of a main flow of existing market has only the power of 200 microwatts (mW)), take to replace after this measure the equivalent electrical circuit that does not contain inductance these extra small screen devices can normally be moved in high-intensity magnetic field (more than or equal to 1.5Tesla).
MRI equipment is very accurate equipment, can influence the normal operation of MRI equipment through the extra small screen device (microdisplay) and the electromagnetic interference (EMI) of image receiver module generation of reconstruction.This these interference of just need taking measures to eliminate:
(1) the extra small screen device blocks that at first is placed in the coil can not contain the ferromagnetism composition.Now a lot of manufacturers are in order to save cost, and as connecting material or being used for wiring board (PCB), this will have a strong impact on the normal use based on the MRI equipment of magnetic field effect with iron-nickel alloy Alloy instead of Copper (or gold, silver material).This just need make interface unit and the wiring board that does not contain ferrimagnet with nonferromugnetic materials such as copper.As for extra small screen device (microdisplay) itself is to make not contain the body magnetic material on silicon materials.
(2) the extra small screen device blocks that is placed in the coil can produce electromagnetic radiation, and MRI equipment relies on tissue such as special electromagnetic wave excites brain and detects these electromagnetic variations.Therefore MRI equipment is very sensitive to electromagnetic interference (EMI).In order to shield the electromagnetic radiation that extra small screen device blocks produces, we can twine extra small screen device blocks multilayer with highdensity copper mesh, and use the glass of metal-coated membrane to shield for the extra small screen part that produces image.Can be connected with conducting resinl or copper adhesive tape between coated glass and the copper mesh.So just can shield the electromagnetic radiation that power only produces in the extra small screen device blocks of hundreds of position microwatt (mW) level (for example the extra small screen of a main flow of existing market has only the power of 200 microwatts (mW)) fully.
(3) in like manner, the lead that connects extra small screen device blocks and image receiver module also needs: the materials such as copper that (I) use nonferromagnetic; (II) line itself needs to use the electromagnetic radiation of copper mesh and Copper Foil shielding generation.
(4) the double-level-metal magnetic masking layer that uses through the image receiver module of double-deck magnetic shielding has also shielded the electromagnetic radiation that the image receiver module produces simultaneously.
(5) incoming line of image receiver module is owing to be positioned at outside the magnetic cavity, and the electromagnetic radiation that therefore only needs to use common shielding line shielding to produce gets final product.Certainly the incoming line of image link block also can be an optical fiber transmission line.
After having taked these measures, we just can make a compact and portable be easy to install and use can be used for vision imaging apparatus in the coil.Compare just many gauze screens and one or two shield glass on volume with general hood type display device.Because in special (bad) environment in coil, make the experimenter of clinical patient or scientific experiment coil and the magnetic cavity around can't see help clinical patient or experimenter, so eyeshade can be removed many adjusting parts.So just can produce the vision imaging apparatus compacter greatly than common hood type display device.
Description of drawings
Further specify below in conjunction with accompanying drawing. In the accompanying drawings, extra small panel module (1) comprises extra small screen (2) and wiring board (3), This module is used for MRI brain coil. Wherein extra small screen (2) need to use the conductive metallic material of the nonferromagnetic such as copper, in addition also Need to use the electromagnetic radiation of metal coating glass shielding generation. Wiring board wherein (3) need to be with the equivalence that does not contain inductance coil Wiring board is transformed, and also needs to use the conducting metal of the nonferromagnetics such as copper. In addition, wiring board (3) also needs to shield with copper mesh Cover the electromagnetic radiation of generation. Must connect with conductive tapes such as conducting resinl or Copper Foils between the shielding material. While gauze screen and extra small screen (2), to keep insulation with insulating tape between the wiring board (3).
Image receiver module (5) is positioned at outside brain coil and the magnetic cavity. This module need to be used double-deck magnetic shielding material shielding strong magnetic field. Because the magnetic shielding material that uses is metal, the electromagnetic radiation that this bilayer magnetic screen while also can masked images receiver module (5).
Line (4) part that connects extra small panel module (1) and image receiver module (5) is in the brain coil, and part is positioned at magnetic In the chamber, part is positioned at outside the magnetic cavity. Therefore this line must use the conductive metallic material of the nonferromagnetic such as copper, and use copper mesh, The metal materials such as Copper Foil shield the electromagnetic radiation that this line produces.
Owing to be in outside the magnetic cavity, therefore only need use common shielding line to get final product as for image receiver module line (6). This connects in addition Line (6) need to use copper rubber belt sealing line (6) and screened room wall (7) during by screened room wall (7).
Embodiment
Summary of the invention has provided detailed ins and outs.What unique in force needs changed as the case may be is: the extra small screen that is fit to the replacement circuit different manufacturers of strong magnetic MRI environment can be different.But cooperate this problem is easy to solve with the production firm.
Claims (4)
1. this patent discloses high resolving power (resolution is more than or equal to 800 * 600) vision imaging apparatus in a kind of MRI coil that can be used for high-intensity magnetic field (more than or equal to 1.5Tesla).It is characterized by:
(1) energy normal high resolving power (resolution is more than or equal to 800 * 600) visual imaging module of using in the MRI coil of high-intensity magnetic field (more than or equal to 1.5Tesla).This module does not influence the normal operation of MRI equipment simultaneously yet.Present visible patent (for example U.S. Pat Patent:5412419,5432544,5877732,6774929) all is the high-resolution imaging equipment that can normally use in magnetic cavity.What be arranged in coil all is optical device such as lens combination or imaging fibre.
(2) images that can normally move in high-intensity magnetic field (more than or equal to 1.5Tesla) are accepted module.
(3) one can be in the MRI coil of high-intensity magnetic field (more than or equal to 1.5Tesla), magnetic cavity the normal line that uses.
(4) incoming line of pointing out the image link block only needs common shielding line to get final product.Certainly the incoming line of image link block also can be an optical fiber transmission line.
2. being characterized as according to the visual imaging module of the disclosed imaging device of claim 1: the connecting line of this image-forming module and wiring board must use nonferromugnetic materials such as copper, and wiring board must be removed inductance component and replace equivalent electrical circuit simultaneously.Extra small screen in the image-forming module must shield the electromagnetic radiation that produces with coated glass in addition; And circuit board must use the electromagnetic radiation of metal mesh shield generations such as copper mesh.And shield glass and shielding copper mesh must with conducting resinl or Copper Foil be connected and and extra small screen and circuit board between insulate with insulating tape.
3. being characterized as according to the image receiver module of the disclosed imaging device of claim 1: this receiver module must use double-deck magnetic shielding.Its ectomesoderm is high saturated magnetic shielding material, and internal layer uses the magnetic shielding material of high magnetic permeability.This bilayer magnetic shielding is owing to be the therefore also electromagnetic radiation of maskable image receiver module generation of metal material.
4. being characterized as according to the line that connects image-forming module and image receiver module in the disclosed imaging device of claim 1: this line must use nonferromugnetic materials such as copper, and uses metal formings such as wire netting such as copper mesh and Copper Foil to shield the electromagnetic radiation of line generation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101898873A CN101281238A (en) | 2007-11-01 | 2007-11-01 | High resolution vision imaging apparatus for NMR imaging coil of intense magnetic field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101898873A CN101281238A (en) | 2007-11-01 | 2007-11-01 | High resolution vision imaging apparatus for NMR imaging coil of intense magnetic field |
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| Publication Number | Publication Date |
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| CN101281238A true CN101281238A (en) | 2008-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2007101898873A Pending CN101281238A (en) | 2007-11-01 | 2007-11-01 | High resolution vision imaging apparatus for NMR imaging coil of intense magnetic field |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106975161A (en) * | 2010-03-09 | 2017-07-25 | 住友重机械工业株式会社 | Accelerated particle irradiation apparatus |
-
2007
- 2007-11-01 CN CNA2007101898873A patent/CN101281238A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106975161A (en) * | 2010-03-09 | 2017-07-25 | 住友重机械工业株式会社 | Accelerated particle irradiation apparatus |
| CN106975161B (en) * | 2010-03-09 | 2021-08-03 | 住友重机械工业株式会社 | Accelerated particle irradiation apparatus |
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Application publication date: 20081008 |