USRE42856E1 - Magnetic resonance probes - Google Patents
Magnetic resonance probes Download PDFInfo
- Publication number
- USRE42856E1 USRE42856E1 US11/810,679 US81067907A USRE42856E US RE42856 E1 USRE42856 E1 US RE42856E1 US 81067907 A US81067907 A US 81067907A US RE42856 E USRE42856 E US RE42856E
- Authority
- US
- United States
- Prior art keywords
- probe
- magnetic resonance
- disposed
- center conductors
- electrodes
- 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.)
- Expired - Lifetime
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-
- 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
- G01R33/285—Invasive instruments, e.g. catheters or biopsy needles, specially adapted for tracking, guiding or visualization by NMR
- G01R33/287—Invasive instruments, e.g. catheters or biopsy needles, specially adapted for tracking, guiding or visualization by NMR involving active visualization of interventional instruments, e.g. using active tracking RF coils or coils for intentionally creating magnetic field inhomogeneities
Definitions
- the impedance can also be controlled by the choice of dielectric material.
- dielectric material Typical materials include polyurethane resins, polyvinyl acetal resins, polyurethane resins with a polyimide (nylon) overcoat, THEIC modified polyester, THEIC modified polyester with a polyamideimide (AI) overcoat, THEIC modified polyester, oxide-based shield coat and a polyamideimide (AI) overcoat, aromatic polyimide resin, bondable thermoplastic phenoxy overcoat, glass fiber, All Wood Insulating Crepe Paper, Thermally Upgraded Electrical Grade Crepe Kraft Paper, High Temperature Aramid Insulating Paper, and combinations of these.
- the length of the proximal portion can be modified by selecting dielectric materials for the first dielectric layer and/or second dielectric layers.
Abstract
Description
where ε0=8.854 pF/m, d is the bare wire diameter in meters, D is the insulated wire diameter in meters, and εr is the relative dielectric constant of the insulating material. In one illustrative embodiment, a 33 AWG magnet wire was used, the wire having a nominal bare wire diameter of 0.0071″ (0.00018034 m) and an insulated diameter of 0.0078″ (0.00019812 m) and an approximate dielectric constant of εr=2. Thus, the insulator thickness was about 17.78 microns, or about 8.89 microns on a side. In this exemplary case the estimated capacitance per unit length is 89 pF/m. This corresponds to a capacitive impedance Zc=1/(2*π*f) of about 28 Ω/m at 63.86 MHz and giving a good coupling at the high frequency range. Because the impedance scales inversely with frequency, the low frequency impedance at 100 kHz is estimated to be 14 kΩ/m. An impedance of 10 kΩ/m or greater is sufficient in most applications to provide sufficient decoupling. The high frequency impedance is preferably kept below 100 Ω/m.
Claims (50)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/810,679 USRE42856E1 (en) | 2002-05-29 | 2007-06-06 | Magnetic resonance probes |
US13/027,489 USRE44736E1 (en) | 2002-05-29 | 2011-02-15 | Magnetic resonance probes |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US38382802P | 2002-05-29 | 2002-05-29 | |
US10/448,736 US6904307B2 (en) | 2002-05-29 | 2003-05-29 | Magnetic resonance probes |
US11/810,679 USRE42856E1 (en) | 2002-05-29 | 2007-06-06 | Magnetic resonance probes |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/448,736 Reissue US6904307B2 (en) | 2002-05-29 | 2003-05-29 | Magnetic resonance probes |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/448,736 Division US6904307B2 (en) | 2002-05-29 | 2003-05-29 | Magnetic resonance probes |
Publications (1)
Publication Number | Publication Date |
---|---|
USRE42856E1 true USRE42856E1 (en) | 2011-10-18 |
Family
ID=29711953
Family Applications (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/448,736 Ceased US6904307B2 (en) | 2002-05-29 | 2003-05-29 | Magnetic resonance probes |
US11/146,900 Expired - Lifetime US7133714B2 (en) | 2002-05-29 | 2005-06-07 | Magnetic resonance imaging probes |
US11/810,679 Expired - Lifetime USRE42856E1 (en) | 2002-05-29 | 2007-06-06 | Magnetic resonance probes |
US13/027,489 Expired - Lifetime USRE44736E1 (en) | 2002-05-29 | 2011-02-15 | Magnetic resonance probes |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/448,736 Ceased US6904307B2 (en) | 2002-05-29 | 2003-05-29 | Magnetic resonance probes |
US11/146,900 Expired - Lifetime US7133714B2 (en) | 2002-05-29 | 2005-06-07 | Magnetic resonance imaging probes |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/027,489 Expired - Lifetime USRE44736E1 (en) | 2002-05-29 | 2011-02-15 | Magnetic resonance probes |
Country Status (6)
Country | Link |
---|---|
US (4) | US6904307B2 (en) |
EP (1) | EP1508051A1 (en) |
JP (1) | JP2006512104A (en) |
AU (2) | AU2003249665B2 (en) |
CA (1) | CA2487140C (en) |
WO (1) | WO2003102614A1 (en) |
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AU2003249665B2 (en) | 2008-04-03 |
USRE44736E1 (en) | 2014-01-28 |
CA2487140C (en) | 2011-09-20 |
AU2008202498A1 (en) | 2008-06-26 |
WO2003102614A1 (en) | 2003-12-11 |
US6904307B2 (en) | 2005-06-07 |
CA2487140A1 (en) | 2003-12-11 |
US20040046557A1 (en) | 2004-03-11 |
US7133714B2 (en) | 2006-11-07 |
JP2006512104A (en) | 2006-04-13 |
EP1508051A1 (en) | 2005-02-23 |
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US20060119361A1 (en) | 2006-06-08 |
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