IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0721545
(2005-12-20)
|
등록번호 |
US-7755357
(2010-08-02)
|
국제출원번호 |
PCT/IB2005/054337
(2005-12-20)
|
§371/§102 date |
20070613
(20070613)
|
국제공개번호 |
WO06/067746
(2006-06-29)
|
발명자
/ 주소 |
- Holle, Eerke
- Haans, Paulus C. H. A.
|
출원인 / 주소 |
- Koninklijke Philips Electronics N.V.
|
인용정보 |
피인용 횟수 :
7 인용 특허 :
6 |
초록
▼
A radio frequency coil for transmitting or receiving signals at a magnetic resonance frequency includes an arrangement of substantially parallel rungs (70, 70′, 70″) and one or more generally annular strip-type end-rings (78, 78′, 78″, 80) disposed generally transverse to
A radio frequency coil for transmitting or receiving signals at a magnetic resonance frequency includes an arrangement of substantially parallel rungs (70, 70′, 70″) and one or more generally annular strip-type end-rings (78, 78′, 78″, 80) disposed generally transverse to the parallel rungs and connected with the rungs. Each generally annular strip-type end-ring includes at least two conductor layers (82, 82′, 82″, 84, 84′, 84″, 86, 88) separated by a dielectric layer (72, 72a, 72b). A radio frequency shield (34) substantially surrounds the arrangement of substantially parallel rungs (70, 70′, 70″). At least one of the conductor layers of each end-ring is connected with the radio frequency shield.
대표청구항
▼
Having described the preferred embodiments, the invention is now claimed to be: 1. A radio frequency coil for transmitting or receiving signals at a magnetic resonance frequency, the coil comprising: an arrangement of substantially parallel rungs; one or more generally annular strip type end-rings
Having described the preferred embodiments, the invention is now claimed to be: 1. A radio frequency coil for transmitting or receiving signals at a magnetic resonance frequency, the coil comprising: an arrangement of substantially parallel rungs; one or more generally annular strip type end-rings disposed generally transverse to the parallel rungs and connected with the rungs, each generally annular strip type end-ring including at least two conductor layers separated by a dielectric layer wherein at least one conductor layer of each generally annular end-ring defines a conductor path with directional components transverse to an annular perimeter of the generally annular end-ring; and a radio frequency shield substantially surrounding the arrangement of substantially parallel rungs, at least one of the conductor layers of each end-ring being connected with the radio frequency shield. 2. A radio frequency coil for transmitting or receiving signals at a magnetic resonance frequency, the coil comprising: an arrangement of substantially parallel rungs; one or more generally annular strip type end-rings disposed generally transverse to the parallel rungs and connected with the rungs, each generally annular strip type end-ring including at least two conductor layers separated by a dielectric layer; a radio frequency shield substantially surrounding the arrangement of substantially parallel rungs, at least one of the conductor layers of each end-ring being connected with the radio frequency shield; and an electrically non-conductive generally cylindrical substrate defining the separating dielectric layers of the one or more end-rings, the substantially parallel rungs being disposed on or in the generally cylindrical substrate oriented substantially parallel to a cylinder axis of the generally cylindrical substrate. 3. The radio frequency coil as set forth in claim 2, wherein the rungs are one of (i) conductive traces and (ii) striplines or microstrips disposed on or in the electrically non-conductive generally cylindrical substrate. 4. The radio frequency coil as set forth in claim 2, wherein at least one conductor layer of each generally annular end-ring has a generally serpentine shape. 5. The radio frequency coil as set forth in claim 2, wherein the end-rings do not include lumped capacitive elements. 6. A radio frequency coil for transmitting or receiving signals at a magnetic resonance frequency, the coil comprising: an arrangement of substantially parallel rungs; one or more generally annular strip type end-rings disposed generally transverse to the parallel rungs and connected with the rungs, each generally annular strip type end-ring including at least two conductor layers separated by a dielectric layer; and a radio frequency shield substantially surrounding the arrangement of substantially parallel rungs, at least one of the conductor layers of each end-ring being connected with the radio frequency shield; wherein the conductor layers of each end-ring include a first conductor layer and a second conductor layer substantially parallel with the first conductor layer, the second conductor layer being conductively connected with the radio frequency shield. 7. The radio frequency coil as set forth in claim 6, wherein the radio frequency shield is generally cylindrical, and the second conductor layer of each end-ring conductively connects with a proximate annular edge of the generally cylindrical radio frequency shield. 8. The radio frequency coil as set forth in claim 7, wherein the second conductor layer of each end-ring conductively connects with the proximate annular edge of the generally cylindrical radio frequency shield along most or all of the annular edge. 9. The radio frequency coil as set forth in claim 7, further including: an electrically non-conductive generally cylindrical substrate arranged inside of and substantially concentrically with the generally cylindrical radio frequency shield, the generally cylindrical substrate defining the separating dielectric layers of the one or more end-rings. 10. The radio frequency coil as set forth in claim 9, wherein the second conductive layer of each end ring is defined by a portion of the radio frequency shield arranged parallel with the first conductor layer. 11. The radio frequency coil as set forth in claim 6, wherein the end-rings do not include lumped capacitive elements. 12. A radio frequency coil for transmitting or receiving signals at a magnetic resonance frequency, the coil comprising: an arrangement of substantially parallel rungs; one or more generally annular strip type end-rings disposed generally transverse to the parallel rungs and connected with the rungs, each generally annular strip type end-ring including at least two conductor layers separated by a dielectric layer; and a radio frequency shield substantially surrounding the arrangement of substantially parallel rungs, at least one of the conductor layers of each end-ring being connected with the radio frequency shield; wherein the conductor layers of each end-ring include: a first conductor layer, and a second conductor layer defined by a portion of the radio frequency shield arranged substantially parallel with the first conductor layer. 13. The radio frequency coil as set forth in claim 12, wherein at least one conductor layer of each generally annular end-ring has a generally serpentine shape. 14. The radio frequency coil as set forth in claim 12, wherein the end-rings do not include lumped capacitive elements. 15. A magnetic resonance scanner comprising: a main magnet generating a main magnetic field in an examination region; magnetic field gradient coils superimposing selected magnetic field gradients on the main magnetic field in the examination region; and a radio frequency coil as set forth in claim 12. 16. A radio frequency coil for transmitting or receiving signals at a magnetic resonance frequency, the coil comprising: an arrangement of substantially parallel rungs; one or more generally annular strip type end-rings disposed generally transverse to the parallel rungs and connected with the rungs, each generally annular strip type end-ring including at least two conductor layers separated by a dielectric layer wherein the dielectric layer of each end ring defines an electrically non-conducting annular ring substrate, and the at least two conductor layers are disposed on opposing surfaces of the annular ring substrate; and a radio frequency shield substantially surrounding the arrangement of substantially parallel rungs, at least one of the conductor layers of each end-ring being connected with the radio frequency shield. 17. The radio frequency coil as set forth in claim 16, wherein at least one conductor layer of each generally annular end-ring has a generally serpentine shape. 18. The radio frequency coil as set forth in claim 16, wherein the end-rings do not include lumped capacitive elements. 19. A radio frequency coil for transmitting or receiving signals at a magnetic resonance frequency, the coil comprising: an arrangement of substantially parallel rungs; one or more generally annular strip type end-rings disposed generally transverse to the parallel rungs and connected with the rungs, each generally annular strip type end-ring including at least two conductor layers separated by a dielectric layer; and a radio frequency shield substantially surrounding the arrangement of substantially parallel rungs, at least one of the conductor layers of each end-ring being connected with the radio frequency shield; wherein the two conductors of each end-ring include: a first conductor, and a second conductor connected with the radio frequency shield, a width and length of the first conductor between neighboring rungs being designed to provide a selected impedance and delay that cooperates with the rungs to tune the coil. 20. The radio frequency coil as set forth in claim 19, wherein (i) a width of the first conductor is selected to provide a selected characteristic impedance of the stripline and (ii) a length of the first conductor between two neighboring rungs is selected to provide a selected delay of the stripline.
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