CA2482801A1 - Radio frequency gradient and shim coil - Google Patents
Radio frequency gradient and shim coil Download PDFInfo
- Publication number
- CA2482801A1 CA2482801A1 CA002482801A CA2482801A CA2482801A1 CA 2482801 A1 CA2482801 A1 CA 2482801A1 CA 002482801 A CA002482801 A CA 002482801A CA 2482801 A CA2482801 A CA 2482801A CA 2482801 A1 CA2482801 A1 CA 2482801A1
- Authority
- CA
- Canada
- Prior art keywords
- adjusting
- current element
- adjustable component
- radio frequency
- component includes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 claims 27
- 238000005481 NMR spectroscopy Methods 0.000 claims 9
- 239000004020 conductor Substances 0.000 claims 6
- 238000003384 imaging method Methods 0.000 claims 2
- 230000005284 excitation Effects 0.000 claims 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/34046—Volume type coils, e.g. bird-cage coils; Quadrature bird-cage coils; Circularly polarised coils
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3628—Tuning/matching of the transmit/receive coil
Landscapes
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Engineering & Computer Science (AREA)
- Medical Informatics (AREA)
- Radiology & Medical Imaging (AREA)
- General Physics & Mathematics (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- High Energy & Nuclear Physics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
A plurality of linear current elements (130B) are configured about a specime n to be imaged. A current in each current element is controlled independent of a current in other current elements to select a gradient and to provide radio frequency shimming. Each current element is driven by a separate channel of a transmitter and connected to a separate channel of a multi-channel receiver. The impedance, and therefore, the current, in each current element is controlled mechanically or electrically.
Claims (57)
1. A radio frequency coil comprising:
a plurality of discrete resonant current elements disposed about a region of interest, each current element having a pair of parallel conductors separated by a dielectric and having an adjustable component, the plurality of current elements including at least a first current element.
a plurality of discrete resonant current elements disposed about a region of interest, each current element having a pair of parallel conductors separated by a dielectric and having an adjustable component, the plurality of current elements including at least a first current element.
2. The radio frequency coil of claim 1 wherein the adjustable component includes a capacitance.
3. The radio frequency coil of any of claims 1 and 2 wherein the adjustable component includes an inductance.
4. The radio frequency coil of any of claims 1 through 3 wherein the adjustable component includes a voractor.
5. The radio frequency coil of any of claims 1 through 4 wherein the adjustable component includes a PIN diode.
6. The radio frequency coil of any of claims 1 through 5 wherein the adjustable component includes a phase shifter.
7. The radio frequency coil of any of claims 1 through 6 further including a preamplifier connected to the first current element.
8. The radio frequency coil of any of claims 1 through 7 further including a transmitter connected to the first current element.
9. The radio frequency coil of any of claims 1 through 8 further including a radio frequency filter circuit connected to the first current element.
10. The radio frequency coil of any of claims 1 through 9 further including a transmit-receive switch connected to the first current element.
11. The radio frequency coil of any of claims 1 through 10 further including a component control line connected to the first current element.
12. The radio frequency coil of any of claims 1 through 11 further including a power sputter connected to the first current element.
13. The radio frequency coil of any of claims 1 through 12 further including a power combiner connected to the first current element.
14. The radio frequency coil of any of claims 1 through 13 wherein the plurality of current elements further includes a second current element and wherein the first current element is electromagnetically decoupled from the second current element.
15. A system comprising:
a radio frequency coil having a plurality of discrete resonant current elements about a region of interest, each current element having a pair of parallel conductors separated by a dielectric and an adjustable component, the plurality of current elements including at least a first current element and a second current element; and a console connected to an adjustable component and adapted to control the adjustable component.
a radio frequency coil having a plurality of discrete resonant current elements about a region of interest, each current element having a pair of parallel conductors separated by a dielectric and an adjustable component, the plurality of current elements including at least a first current element and a second current element; and a console connected to an adjustable component and adapted to control the adjustable component.
16. The system of claim 15 wherein the first current element is connected to the console by a transmitter.
17. The system of any of claims 15 and 16 wherein the first current element is connected to the console by a receiver.
18. The system of any of claims 15 through 17 wherein the first current element is connected to the console by a control line connected to the adjustable component.
19. The system of any of claims 15 through 18 wherein the console is adapted to provide radio frequency field shimming.
20. The system of any of claims 15 through 19 wherein the console is adapted to provide a radio frequency field gradient.
21. The system of any of claims 15 through 20 wherein the console is adapted to provide parallel signal excitation.
22. The system of any of claims 15 through 21 wherein the console is adapted to provide parallel signal reception.
23. The system of claim 15 wherein the console includes a processor and the adjustable component includes a reactive component.
24. A method comprising:
positioning a sample relative to a radio frequency coil having a plurality of discrete resonant current elements, at least one current element having a pair of parallel conductors separated by a dielectric and having an adjustable component;
comparing a measured radio frequency field dependant nuclear magnetic resonance parameter for the sample with a predetermined value; and if the measured nuclear magnetic resonance parameter is unsatisfactory, then adjusting the adjustable component to achieve a satisfactory nuclear magnetic resonance value.
positioning a sample relative to a radio frequency coil having a plurality of discrete resonant current elements, at least one current element having a pair of parallel conductors separated by a dielectric and having an adjustable component;
comparing a measured radio frequency field dependant nuclear magnetic resonance parameter for the sample with a predetermined value; and if the measured nuclear magnetic resonance parameter is unsatisfactory, then adjusting the adjustable component to achieve a satisfactory nuclear magnetic resonance value.
25. The method of claim 24 wherein adjusting the adjustable component includes adjusting an impedance.
26. The method of any of claims 24 and 25 wherein adjusting the adjustable component includes adjusting a capacitance.
27. The method of any of claims 24 through 26 wherein adjusting the adjustable component includes adjusting an inductance.
28. The method of any of claims 24 through 27 wherein adjusting the adjustable component includes adjusting a PIN diode.
29. The method of any of claims 24 through 28 wherein adjusting the adjustable component includes adjusting a phase.
30. The method of any of claims 24 through 29 wherein adjusting the adjustable component includes adjusting a preamplifier connected to the at least one current element.
31. The method of any of claims 24 through 30 wherein adjusting the adjustable component includes adjusting a transmitter connected to the at least one current element.
32. The method of any of claims 24 through 31 wherein adjusting the adjustable component includes adjusting a radio frequency filter circuit connected to the at least one current element.
33. The method of any of claims 24 through 32 wherein adjusting the adjustable component includes adjusting a transmit-receive switch connected to the at least one current element.
34. The method of any of claims 24 through 33 wherein adjusting the adjustable component includes adjusting a power splitter connected to the at least one current element.
35. The method of any of claims 24 through 34 wherein adjusting the adjustable component includes adjusting a power combiner connected to the at least one current element.
36. The method of any of claims 24 through 35 wherein adjusting the adjustable component includes adjusting a component control line connected to the at least one current element.
37. A method comprising:
positioning a sample relative to a radio frequency coil having a plurality of electromagnetically decoupled discrete resonant current elements about a region of interest, each current element having a pair of parallel conductors separated by a dielectric and having an adjustable component, the plurality of current elements including at least a first current element and a second current element;
comparing a measured radio frequency field dependant nuclear magnetic resonance parameter for the sample with a predetermined value;
if the measured nuclear magnetic resonance parameter is unsatisfactory, then adjusting a first adjustable component of the first current element and adjusting a second adjustable component of the second current element to achieve a satisfactory nuclear magnetic resonance value; and processing a first signal received from the first current element and a second signal from the second current element using a parallel imaging routine.
positioning a sample relative to a radio frequency coil having a plurality of electromagnetically decoupled discrete resonant current elements about a region of interest, each current element having a pair of parallel conductors separated by a dielectric and having an adjustable component, the plurality of current elements including at least a first current element and a second current element;
comparing a measured radio frequency field dependant nuclear magnetic resonance parameter for the sample with a predetermined value;
if the measured nuclear magnetic resonance parameter is unsatisfactory, then adjusting a first adjustable component of the first current element and adjusting a second adjustable component of the second current element to achieve a satisfactory nuclear magnetic resonance value; and processing a first signal received from the first current element and a second signal from the second current element using a parallel imaging routine.
38. The method of claim 37 wherein adjusting the first adjustable component includes adjusting an impedance.
39. The method of any of claims 37 and 38 wherein adjusting the first adjustable component includes adjusting a capacitance.
40. The method of any of claims 37 through 39 wherein adjusting the first adjustable component includes adjusting an inductance.
41. The method of any of claims 37 through 40 wherein adjusting the first adjustable component includes adjusting a PIN diode.
42: The method of any of claims 37 through 41 wherein adjusting the first adjustable component includes adjusting a phase.
43. The method of any of claims 37 through 42 wherein adjusting the first adjustable component includes adjusting a preamplifier connected to the first current element.
44. The method of any of claims 37 through 43 wherein adjusting the first adjustable component includes adjusting a transmitter connected to the first current element.
45. The method of any of claims 37 through 44 wherein adjusting the first adjustable component includes adjusting a radio frequency filter circuit connected to the first current element.
46. The method of any of claims 37 through 45 wherein adjusting the first adjustable component includes adjusting a transmit-receive switch connected to the first current element.
47. The method of any of claims 37 through 46 wherein adjusting the first adjustable component includes adjusting a power splitter connected to the first current element.
48. The method of any of claims 37 through 47 wherein adjusting the first adjustable component includes adjusting a power combiner connected to the first current element.
49. The method of any of claims 37 through 48 wherein adjusting the first adjustable component includes adjusting a component control line connected to the first current element.
50. An article having a machine-accessible storage medium including stored data, wherein the data, when accessed, results in a machine performing the method of:
determining a parameter of a field in a region of interest proximate a radio frequency coil having a plurality of current elements, each current element having a pair of parallel conductors separated by a dielectric, the plurality of current elements including at least a first current element and a second current element; and adjusting an impedance of the first current element while an impedance of the second current element remains fixed, the adjusting selected based on the determined parameter.
determining a parameter of a field in a region of interest proximate a radio frequency coil having a plurality of current elements, each current element having a pair of parallel conductors separated by a dielectric, the plurality of current elements including at least a first current element and a second current element; and adjusting an impedance of the first current element while an impedance of the second current element remains fixed, the adjusting selected based on the determined parameter.
51. The article of claim 50 wherein determining the parameter includes determining homogeneity.
52. The article of any of claims 50 and 51 further including adjusting an impedance of the second current element while an impedance of the first current element remains fixed.
53. The article of any of claims 50 through 52 wherein adjusting includes adjusting a reactive component.
54. A system comprising:
means for positioning a sample relative to a radio frequency coil having a plurality of electromagnetically decoupled discrete resonant current elements about a region of interest, each current element having a pair of parallel conductor means separated by a dielectric and having an adjustable component means, the plurality of current elements including at least a first current element and a second current element;
means for comparing a measured radio frequency field dependant nuclear magnetic resonance parameter for the sample with a predetermined value;
means for adjusting a first adjustable component means of the first current element and adjusting a second adjustable component means of the second current element to achieve a satisfactory nuclear magnetic resonance value if the measured nuclear magnetic resonance parameter is unsatisfactory;
and means for processing a first signal received from the first current element and a second signal from the second current element using a parallel imaging routine.
means for positioning a sample relative to a radio frequency coil having a plurality of electromagnetically decoupled discrete resonant current elements about a region of interest, each current element having a pair of parallel conductor means separated by a dielectric and having an adjustable component means, the plurality of current elements including at least a first current element and a second current element;
means for comparing a measured radio frequency field dependant nuclear magnetic resonance parameter for the sample with a predetermined value;
means for adjusting a first adjustable component means of the first current element and adjusting a second adjustable component means of the second current element to achieve a satisfactory nuclear magnetic resonance value if the measured nuclear magnetic resonance parameter is unsatisfactory;
and means for processing a first signal received from the first current element and a second signal from the second current element using a parallel imaging routine.
55. The system of claim 54 wherein the first adjustable component means includes an impedance.
56. The system of any of claims 54 and 55 wherein the first adjustable component means includes a capacitance.
57. The system of any of claims 54 through 56 wherein the first adjustable component means includes an inductance.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US37380802P | 2002-04-19 | 2002-04-19 | |
| US60/373,808 | 2002-04-19 | ||
| US37811102P | 2002-05-14 | 2002-05-14 | |
| US60/378,111 | 2002-05-14 | ||
| PCT/US2003/012393 WO2003089947A1 (en) | 2002-04-19 | 2003-04-21 | Radio frequency gradient and shim coil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2482801A1 true CA2482801A1 (en) | 2003-10-30 |
| CA2482801C CA2482801C (en) | 2011-09-06 |
Family
ID=29254535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2482801A Expired - Lifetime CA2482801C (en) | 2002-04-19 | 2003-04-21 | Radio frequency gradient and shim coil |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1497668A1 (en) |
| JP (1) | JP2005523094A (en) |
| KR (1) | KR20040103981A (en) |
| CN (1) | CN1646933A (en) |
| AU (1) | AU2003262371A1 (en) |
| CA (1) | CA2482801C (en) |
| WO (1) | WO2003089947A1 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1864080A (en) * | 2003-10-03 | 2006-11-15 | 明尼苏达大学董事会 | Parallel transceiver for nuclear magnetic resonance system |
| EP1751571B1 (en) * | 2004-05-07 | 2020-07-15 | Regents Of The University Of Minnesota | Multi-current elements for magnetic resonance radio frequency coils |
| EP1797444A1 (en) | 2004-10-07 | 2007-06-20 | Invivo Corporation | Method and apparatus for discrete shielding of volume rf coil arrays |
| CN101283286A (en) * | 2005-10-07 | 2008-10-08 | 皇家飞利浦电子股份有限公司 | Multiple-channel transmit magnetic resonance |
| JP5179019B2 (en) * | 2006-04-04 | 2013-04-10 | 株式会社日立製作所 | Coil device and nuclear magnetic resonance imaging apparatus using the same |
| US7525313B2 (en) * | 2007-05-04 | 2009-04-28 | General Electric Company | System and method for multi-channel MR transmission |
| JP5549977B2 (en) * | 2010-04-26 | 2014-07-16 | 株式会社 Ｊｅｏｌ Ｒｅｓｏｎａｎｃｅ | NMR probe and NMR apparatus |
| KR101454663B1 (en) * | 2013-03-26 | 2014-10-27 | 삼성전자주식회사 | Radio frequency resonators, radio frequency coil and magnetic resonance imaging apparatus |
| DE102013213400A1 (en) * | 2013-06-21 | 2014-12-24 | Siemens Aktiengesellschaft | Transmitting unit for a magnetic resonance tomography system |
| KR101890261B1 (en) * | 2016-12-01 | 2018-08-22 | 가천대학교 산학협력단 | Magnetic resonance imaging birdcage coil assembly aligned along the z-axis |
| US11333731B2 (en) | 2018-04-13 | 2022-05-17 | Canon Medical Systems Corporation | Magnetic resonance imaging apparatus, RF coil, and magnetic resonance imaging method |
| KR101995904B1 (en) * | 2018-11-09 | 2019-07-04 | 한국기초과학지원연구원 | Method for measuring spatial magnetic field distribution of magnet and apparatus for measuring spatial magnetic field distribution of magnet using it |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5001428A (en) * | 1989-08-21 | 1991-03-19 | General Electric Company | Method for mapping the RF transmit and receive field in an NMR system |
| JP3171881B2 (en) * | 1991-07-31 | 2001-06-04 | 株式会社東芝 | High frequency probe for magnetic resonance imaging apparatus and magnetic resonance imaging apparatus |
| US5594338A (en) * | 1995-03-08 | 1997-01-14 | Quantum Magnetics, Inc. | Automatic tuning apparatus and method for substance detection using nuclear quadrupole resonance and nuclear magnetic resonance |
| CA2373526A1 (en) * | 1999-05-21 | 2000-11-30 | The General Hospital Corporation | Tem resonator for magnetic resonance imaging |
-
2003
- 2003-04-21 EP EP03747048A patent/EP1497668A1/en not_active Withdrawn
- 2003-04-21 JP JP2003586628A patent/JP2005523094A/en active Pending
- 2003-04-21 WO PCT/US2003/012393 patent/WO2003089947A1/en active Application Filing
- 2003-04-21 CN CNA038087987A patent/CN1646933A/en active Pending
- 2003-04-21 CA CA2482801A patent/CA2482801C/en not_active Expired - Lifetime
- 2003-04-21 KR KR10-2004-7016826A patent/KR20040103981A/en not_active Application Discontinuation
- 2003-04-21 AU AU2003262371A patent/AU2003262371A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| CA2482801C (en) | 2011-09-06 |
| AU2003262371A1 (en) | 2003-11-03 |
| KR20040103981A (en) | 2004-12-09 |
| WO2003089947A8 (en) | 2004-05-06 |
| CN1646933A (en) | 2005-07-27 |
| EP1497668A1 (en) | 2005-01-19 |
| WO2003089947A1 (en) | 2003-10-30 |
| JP2005523094A (en) | 2005-08-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20230421 |