US20060006865A1 - Method and apparatus for magnetic resonance imaging and spectroscopy using microstrip transmission line coils - Google Patents

Method and apparatus for magnetic resonance imaging and spectroscopy using microstrip transmission line coils Download PDF

Info

Publication number
US20060006865A1
US20060006865A1 US11224436 US22443605A US2006006865A1 US 20060006865 A1 US20060006865 A1 US 20060006865A1 US 11224436 US11224436 US 11224436 US 22443605 A US22443605 A US 22443605A US 2006006865 A1 US2006006865 A1 US 2006006865A1
Authority
US
Grant status
Application
Patent type
Prior art keywords
coil
mtl
embodiment
example
invention
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.)
Abandoned
Application number
US11224436
Inventor
Xiaoliang Zhang
Kamil Ugurbil
Wei Chen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of Minnesota
Original Assignee
University of Minnesota
Priority date (The priority date 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 date listed.)
Filing date
Publication date

Links

Images

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q17/00Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00Arrangements or instruments for measuring magnetic variables
    • G01R33/20Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/32Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/34Constructional details, e.g. resonators, specially adapted to MR
    • G01R33/345Constructional details, e.g. resonators, specially adapted to MR of waveguide type
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00Arrangements or instruments for measuring magnetic variables
    • G01R33/20Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/32Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/34Constructional details, e.g. resonators, specially adapted to MR
    • G01R33/34007Manufacture of RF coils, e.g. using printed circuit board technology; additional hardware for providing mechanical support to the RF coil assembly or to part thereof, e.g. a support for moving the coil assembly relative to the remainder of the MR system
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49002Electrical device making
    • Y10T29/4902Electromagnet, transformer or inductor
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49002Electrical device making
    • Y10T29/4902Electromagnet, transformer or inductor
    • Y10T29/49073Electromagnet, transformer or inductor by assembling coil and core

Abstract

Apparatus and method for MRI imaging using a coil constructed of microstrip transmission line (MTL coil) are disclosed. In one method, a target is positioned to be imaged within the field of a main magnetic field of a magnet resonance imaging (MRI) system, a MTL coil is positioned proximate the target, and a MRI image is obtained using the main magnet and the MTL coil. In another embodiment, the MRI coil is used for spectroscopy. MRI imaging and spectroscopy coils are formed using microstrip transmission line. These MTL coils have the advantageous property of good performance while occupying a relatively small space, thus allowing MTL coils to be used inside restricted areas more easily than some other prior art coils. In addition, the MTL coils are relatively simple to construct of inexpensive components and thus relatively inexpensive compared to other designs. Further, the MTL coils of the present invention can be readily formed in a wide variety of coil configurations, and used in a wide variety of ways. Further, while the MTL coils of the present invention work well at high field strengths and frequencies, they also work at low frequencies and in low field strengths as well.

Description

    CROSS REFERENCE TO RELATED APPLICATIONS
  • [0001]
    This application is a continuation application of U.S. patent application Ser. No. 09/974,184, filed Oct. 9, 2001, which is a continuation of provisional application Ser. No. 60/239,185, filed, Oct. 9, 2000, and entitled “Microstrip Resonator RF Surface and Volume Coils and Methods for NMR Imaging and Spectroscopy at High Fields.” The entire contents of U.S. application Ser. No. 60/239,185 are hereby incorporated herein by reference.
  • GOVERNMENT RIGHTS
  • [0002]
    This invention was partially supported by NIH grants NS38070 (W.C.), NS39043 (W.C.), P41 RR08079 (a National Research Resource grant from NIH), Keck Foundation, National Foundation for Functional Brain Imaging and the US Department of Energy. The Government may have certain rights in the invention.
  • TECHNICAL FIELD OF THE INVENTION
  • [0003]
    This invention pertains generally to magnetic resonance imaging (MRI) and more specifically to surface and volume coils for MRI imaging and spectroscopy procedures.
  • BACKGROUND OF THE INVENTION
  • [0004]
    Surface and volume coils are used in MRI imaging or spectroscopy procedures in order to obtain more accurate or detailed images of tissue under investigation. Preferably, a MRI coil performs accurate imaging or spectroscopy across a wide range of resonant frequencies, is easy to use, and is affordable. Further, the operating volume inside the main magnet of many MRI systems is relatively small, often just large enough for a patient's head or body. As a result, there is typically little space available for a coil in addition to the patient. Accordingly, it is advantageous if a surface or volume coil itself occupies as little space as possible.
  • [0005]
    In high fields (3 Tesla and beyond), due to the high Larmour frequencies required, radiation losses of RF coils become significant which decreases a coil's quality factor or Q factor, and a low Q factor can result in low signal-to-noise ratio (SNR) in MRI procedures. One existing solution to reducing radiation losses is adding a RF shielding around the coil(s). The RF shielding, however, usually makes the physical size of RF coil much larger, which as noted above is not desired in the MR studies, especially in the case of high field operations.
  • SUMMARY OF THE INVENTION
  • [0006]
    According to certain example embodiments of the invention there are provided a MRI coil formed of microstrip transmission line. According to various embodiments of the invention, MRI coils according the present invention are easy to manufacture with relatively low cost components, and compact in design. In addition, the coil's distributed element design provides for operation at relatively high quality factors and frequencies and in high field (4 Tesla or more) environments. Further, microstrip coils according to the present invention exhibit relatively low radiation losses and require no RF shielding. As a result of not requiring RF shielding, the coils may be of compact size while having high operating frequencies for high field MR studies, thus saving space in the MRI machine. Further, the methods and apparatus of the present invention are not just good for high frequency MR studies, but also good for low frequency cases.
  • BRIEF DESCRIPTION OF THE DRAWING
  • [0007]
    FIG. 1 illustrates a method according to one example embodiment of the invention.
  • [0008]
    FIGS. 2-14 illustrate various example embodiments of the apparatus of the invention.
  • DETAILED DESCRIPTION OF THE INVENTION
  • [0009]
    In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings that form a part hereof, and in which is shown by way of illustration specific preferred embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, and it is to be understood that other embodiments may be utilized and that logical, mechanical and electrical changes may be made without departing from the spirit and scope of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined only be the appended claims.
  • Method Embodiments
  • [0010]
    According to a first method embodiment of the invention, as illustrated in FIG. 1, a target is positioned within the field of a main magnetic field of a magnet resonance imaging (MRI) system, at least one coil is positioned proximate the target wherein the coil is constructed using at least one microstrip transmission line, and the main magnet and the MTL coil are used to obtain MRI images from the target. According to one use of the microstrip transmission line (MTL) coil, it is operated as a receiver (pickup coil) or a transmitter (excitation coil) or both during an imaging procedure. As used herein the term “MTL coil” generally refers to any coil formed using a microstrip transmission line.
  • [0011]
    The microstrip transmission line, according to one example design, is formed of a strip conductor, a ground plane and a dielectric material that may be air, a vacuum, low loss dielectric sheets such as Teflon or Duroid, or liquid Helium or liquid Nitrogen. Further, the strip conductor or ground plane are, in one embodiment, formed in whole or in part from a non-magnetic conductive material such as copper or silver. According to another example embodiment of the invention, the ground planes for multiple strip conductors are arranged in one single piece foil so as to reduce radiation loss.
  • [0012]
    In another example embodiment, the MTL coil is a volume MTL coil having a plurality of microstrip transmission lines. In still another example embodiment, the volume MTL coil is detuned using PIN diodes. In yet another example embodiment, the MTL coil includes bisected ground planes and the PIN diodes are positioned in the gap of the bisected ground planes.
  • [0013]
    According to still other example embodiments of the methods of the invention, a MTL coil is tuned by varying capacitive termination of the MTL coil wherein, for example but not by way of limitation, the MTL coil is tuned by varying capacitive termination on each end of the MTL coil.
  • [0014]
    In still other example embodiments of the method, the microstrip transmission line is arranged in a rectangular or circular configuration, or, in the alternative, in an S shape. In one advantageous embodiment, the MTL coil is constructed using at least two turns to improve the homogeneity of the magnetic field characteristics.
  • [0015]
    In still other example embodiments, one or more lumped elements are connected to the transmission line and operated so as to match the impedance of the line.
  • [0016]
    In yet still another embodiment, an MTL coil is operated in a resonant mode by bisection of the ground plane and tuning of the resonance by adjusting displacement of the ground planes. In another embodiment, at least two of the MTL coils are operated in a quadrature mode. In still another embodiment, a coil is arranged so as to operate as a ladder MTL coil. In yet another embodiment, at least two MTL coils are arranged and operated as a half volume MTL coil.
  • [0017]
    In still another example embodiment, an inverted imaging MTL coil is formed wherein the dielectric material is positioned in a plane on the side of the strip conductor plane in the direction of the field, and wherein coupling is capacitive.
  • [0018]
    In yet another example embodiment of the methods of the invention, the MTL coil is driven using a capacitive impedance matching network. In still another example embodiment of the methods of the invention, the dielectric constant Er is adjusted to change the resonant frequency of the MTL coil.
  • [0019]
    In yet still another example embodiment of the method, the coil dielectric substrate is flexible, and the MTL coil is formed and used in more than one configuration allowing a single coil to be adapted to multiple purposes. According to still another embodiment, the substrate is formed of thin layers of Teflon or other dielectric material allowing the substrate to be bent or twisted.
  • Apparatus Embodiments
  • [0020]
    Referring first to FIGS. 2A and 2B, there is illustrated in diagrammatic form an example embodiment of a microstrip transmission line (MTL) 20 having a strip conductor 21 with a width W and ground plane 22, on either side of a dielectric substrate 23 having a height H and dielectric coefficient Er. Magnetic field lines H are shown surrounding strip conductor 21 and emanating outward in the Y direction orthogonal to ground plane 22 and along the length of strip conductor 21. As illustrated, the field is contained in whole or in part on one side of the strip conductor 21 by the ground plane 22, and extends outwardly beyond the plane of the strip conductor in a direction extending away from the ground plane.
  • [0021]
    According to a first embodiment of the apparatus of the invention, as illustrated in FIGS. 2C and 2D, there is provided a single turn MRI imaging or spectroscopy MTL coil 23 constructed using at least one microstrip transmission line. The microstrip transmission line coil, according to one example design, is formed of a strip conductor 24, a ground plane 25 and a substrate 26 made of a dielectric material that may be air, a vacuum, a single or multilayer low loss dielectric sheets such as Teflon or Duroid materials, or liquid Helium or Nitrogen. According to one example embodiment, such coil is 9 cm×9 cm, has a substrate 26 that is 5-7 mm, uses copper foil 36 microns in thickness (for example an adhesive-backed copper tape such as is available from 3M Corporation of St. Paul, Minn.) for the strip conductors and ground plane, and has a resonant frequency of 300 MHz. According to one example embodiment, the MRI signal intensity is proportional to H when H<5 mm and reaches a maximum when H 5 mm. These results indicate that the optimized H value is about 5-7 mm for the above embodiments of the microstrip MTL coils according to the present invention. Further, the dielectric material thickness H, or more accurately, the ratio W/H, is an important parameter that affects the B1 penetration in air. If H is too small, or W/H too large, most of electromagnetic fields will be compressed around the strip conductor. Although the B1 penetration will increase with the increase of dielectric material thickness H, or the decrease of the ratio W/H, a thickness of 5-7 mm is suggested in practice because the radiation loss can become significant when the substrate is much thicker. This optimized H makes it possible to build a very thin surface coil at extremely high fields, where the coil thickness can, in certain circumstances, be less than the conventional surface coil with RF shielding.
  • [0022]
    Further, the strip conductor or ground plane are, in one embodiment, formed in whole or in part from a non-conductive material such as copper or silver. As also illustrated, the strip conductor and ground plane, in this embodiment and others described below, is connected to a source of electrical excitation or RF detection circuitry, for example through a coax or other connector (not shown). According to still another example embodiment, because corners of the coil tend to radiate surface waves and thus have a potential to cause hot spots in images and degrade the Q value of coils, the corners may be chamfered to reduce the radiation loss and improve B1 distribution. According to another example embodiment 30 of the invention as illustrated in FIGS. 3A and 3B, a two turn coil is illustrated. As shown, a single ground plane 32 is shared by the strip conductors 34, wherein the ground planes are formed for example with a single sheet of foil so as to reduce radiation loss. FIGS. 3C and 3D illustrate additional embodiments 35 and 36 wherein embodiment 35 has one turn and embodiment 36 has two turns 102 to improve the homogeneity of the magnetic field characteristics.
  • [0023]
    In still other configurations, the coils may assume an “S” shape, as may be advantageously used for example in a volume coil design, or any other arbitrary shape. Further, as illustrated in FIGS. 2C and 3A, one or more elements 27 and 31, respectively, are connected to the transmission line so as to match the impedance of the line.
  • [0024]
    In another example embodiment as illustrated in FIGS. 4A and 4B, the MTL coil 42 is a half-volume coil having a plurality of microstrip transmission lines each having a ground plane 46 and strip conductor 48.
  • [0025]
    In still another example embodiment illustrated in FIGS. 5A and 5B, the MTL coil 50 includes a bisected ground plane 52. In this configuration, tuning of the resonance frequency is accomplished by adjusting displacement 54 of at least one of the ground planes. As illustrated in FIG. 6, in yet another embodiment 60, PIN diodes 64 are positioned in the gap 66 of the bisected ground planes 62, and used to detune the coil.
  • [0026]
    According to still other example embodiments of the apparatus of the invention illustrated in FIG. 7A, a MTL coil 70 is tuned by varying capacitive termination elements 72 on one end of the coil. FIG. 7B illustrates a hypothetical plot of magnetic field profile vs. capacitive termination value for a range of capacitances. As illustrated, increasing capacitive termination raises the magnetic field profile at the end of the coil at which the termination is applied. FIGS. 7C and 7D illustrate an example embodiment and field profile for tuning a MTL coil 74 by varying capacitive termination on each end 75 of the coil. Further, fine tuning can also be accomplished by slightly changing the length of the strip conductor.
  • [0027]
    In yet still another embodiment illustrated in FIG. 8A, at least two of the MTL coils 80 are arranged to be operated in a quadrature mode. The equivalent electrical circuit for MTL coil 80 is illustrated in FIG. 8B. In this example schematic, Z0 is the characteristic impedance of each microstrip element. In the impendence jX, jX1, jX2, jX15, X, X1, X2, X15 are positive real numbers. For the mode 1, the current on each microstrip resonant element is modulated by a cosine function cos(npie/8) where n=0, 1, 2, . . . , 15. L denotes the length of the volume coil 80.
  • [0028]
    In another example embodiment shown in FIG. 9, an MTL coil 90 is formed as arranged and operated as a ladder MTL coil. In yet another embodiment illustrated in schematic form in FIGS. 10A and 10B, a volume coil 100 is provided. Coil 100 includes ground planes 102 on the outside of a cylinder of dielectric material (for example Acrylic) having a diameter of 260 mm, a length of 210 mm, and a material thickness 104 of 6.35 mm. Strip conductors 106 are placed on the inside of the coil 100 running parallel to the axis. Coaxial connectors 108 are provided to connect the ground planes and strip conductors to a source of electrical excitation or RF detectors, as is conventionally done in use of a MRI volume or surface coil. According to one example embodiment of the apparatus, the high permittivity of the human head, the dielectric resonance effect results in higher signal intensity in the central region of the image. This higher intensity can be taken into account in the design of a large volume coil at high fields. In one example embodiment, in order to achieve a relatively uniform MR image in the human head, an inhomogeneous B1 distribution in the transaxial plane in free space is intentionally designed to compensate for the dielectric resonance effect in the human head.
  • [0029]
    According to still another embodiment, for the individual microstrip resonant element, the resonant frequency can be modified by choosing appropriate dielectric substrate with different relative dielectric constant. Therefore, doubly tuned frequency operation can be easily achieved by making two different resonant frequencies for the microstrip elements in the volume coil, alternatively. Namely, one set of microstrip resonant elements with even numbers can be set to one resonance frequency while another set of microstrip resonant elements with odd numbers set to a different resonance frequency. Multiple tuned RF coils also can be designed using the same approach. Each resonance can be quadraturely driven with an appropriate quadrature hybrid.
  • [0030]
    In still another example embodiment shown in FIG. 11, an inverted MTL coil 110 is illustrated, wherein is coupling is capacitive adjacent microstrip elements to provide lower resonant frequency operation.
  • [0031]
    Still another example embodiment 120 of the invention is illustrated in FIG. 12, wherein the strip conductors 122 have ‘T’ shaped ends 124 and coupling gap 126 between tips 128 of the ends are adjusted to change the current and E field at the end of the coil, and thus allow the operating frequency to be raised.
  • [0032]
    In yet still another example embodiment of the apparatus shown in FIG. 13, the MTL coil 130 substrate dielectric is formed of one or more relatively thin flexible layers 132 so that the coil may be bent or twisted or otherwise formed. Such layers may be formed of Teflon, for example. According to this embodiment, the coil 130 may be bent or formed into a first configuration, and thereafter formed into a second or third or more different configurations, wherein the coil may be used in more than one configuration and thus have a multipurpose nature.
  • [0033]
    Referring now to FIG. 14, there is illustrated a photograph of yet one more example embodiment of a volume coil 140 according to the present invention.
  • [0034]
    According to still yet another example embodiment, the MTL coil is formed as a dome-shaped coil which offers an increased filling factor and a great sensitivity and homogeneity in the top area of the human head. By applying the microstrip resonator volume coil technique, the dome-shaped coil can be constructed for higher field applications.
  • [0035]
    According to still another embodiment of the invention, the unbalanced circuit of the microstrip coil provides that there is no need to use the balun circuit commonly used in surface coils and balanced volume coils to stabilize the coil's resonance and diminish the so-called ‘cable resonance’.
  • [0036]
    Thus, there has been described above method and apparatus for forming MRI imaging and spectroscopy coils using microstrip transmission line. Due to its specific semi-open transmission line structure, substantial electromagnetic energy is stored in the dielectric material between the thin conductor and the ground plane, which results in a reduced radiation loss and a reduced perturbation of sample loading to the RF coil, compared to conventional surface coils. The MTL coils of the present invention are also characterized by a high Q factor, no RF shielding, small physical coil size, lower cost and easy fabrication. These MTL coils have the advantageous property of good performance while occupying a relatively small space, thus allowing MTL coils to be used inside restricted areas more easily than some other prior art coils. Further, the MTL coils of the present invention can be readily formed in a wide variety of coil configurations, and used in a wide variety of ways. Further, while the MTL coils of the present invention work well at high field strengths and frequencies, they also work at low frequencies and in low field strengths as well.
  • [0037]
    Further information concerning the design, operation and theory of MTL coils is found in Zhang, X. et al., “Microstrip RF Surface Coil Design for Extremely High-Field MRI and Spectroscopy”, Magn. Reson. Med. 2001 September; 46(3):443-50 and Zhang X. et al., “A Novel RF Volume Coil Design Using Microstrip Resonator for NMR Imaging and Spectroscopy”, submitted for publication. The entire contents of both of the aforementioned papers are incorporated herein by reference.

Claims (1)

  1. 1. A method, comprising:
    positioning a target to be imaged within the field of a main magnetic field of a magnet resonance imaging (MRI) system;
    positioning at least one coil proximate the target wherein the coil is constructed using at least one microstrip transmission line;
    imaging the target using the main magnet and the coil with MRI.
US11224436 2000-10-09 2005-09-12 Method and apparatus for magnetic resonance imaging and spectroscopy using microstrip transmission line coils Abandoned US20060006865A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US23918500 true 2000-10-09 2000-10-09
US09974184 US7023209B2 (en) 2000-10-09 2001-10-09 Method and apparatus for magnetic resonance imaging and spectroscopy using microstrip transmission line coils
US11224436 US20060006865A1 (en) 2000-10-09 2005-09-12 Method and apparatus for magnetic resonance imaging and spectroscopy using microstrip transmission line coils

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11224436 US20060006865A1 (en) 2000-10-09 2005-09-12 Method and apparatus for magnetic resonance imaging and spectroscopy using microstrip transmission line coils
US11436197 US20060277749A1 (en) 2000-10-09 2006-05-17 Method and apparatus for magnetic resonance imaging and spectroscopy using microstrip transmission line coils

Publications (1)

Publication Number Publication Date
US20060006865A1 true true US20060006865A1 (en) 2006-01-12

Family

ID=22900994

Family Applications (3)

Application Number Title Priority Date Filing Date
US09974184 Active 2022-09-08 US7023209B2 (en) 2000-10-09 2001-10-09 Method and apparatus for magnetic resonance imaging and spectroscopy using microstrip transmission line coils
US11224436 Abandoned US20060006865A1 (en) 2000-10-09 2005-09-12 Method and apparatus for magnetic resonance imaging and spectroscopy using microstrip transmission line coils
US11436197 Abandoned US20060277749A1 (en) 2000-10-09 2006-05-17 Method and apparatus for magnetic resonance imaging and spectroscopy using microstrip transmission line coils

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US09974184 Active 2022-09-08 US7023209B2 (en) 2000-10-09 2001-10-09 Method and apparatus for magnetic resonance imaging and spectroscopy using microstrip transmission line coils

Family Applications After (1)

Application Number Title Priority Date Filing Date
US11436197 Abandoned US20060277749A1 (en) 2000-10-09 2006-05-17 Method and apparatus for magnetic resonance imaging and spectroscopy using microstrip transmission line coils

Country Status (4)

Country Link
US (3) US7023209B2 (en)
EP (1) EP1344076A1 (en)
JP (2) JP2004511278A (en)
WO (1) WO2002031522A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060158191A1 (en) * 2003-08-21 2006-07-20 Insight Neuroimaging Systems, Llc Microstrip coil design for MRI apparatus
US20060277749A1 (en) * 2000-10-09 2006-12-14 Regents Of The University Of Minnesota Method and apparatus for magnetic resonance imaging and spectroscopy using microstrip transmission line coils
US20070192103A1 (en) * 2006-02-14 2007-08-16 Nobuo Sato Conversational speech analysis method, and conversational speech analyzer
US20110204890A1 (en) * 2008-10-29 2011-08-25 Hitachi Medical Corporation Antenna device and magnetic resonance imaging device
WO2016172650A1 (en) * 2015-04-24 2016-10-27 Massachusetts Institute Of Technology Micro magnetic resonance relaxometry
US9599685B2 (en) 2010-10-07 2017-03-21 Hitachi, Ltd. Antenna device and magnetic resonance imaging device for suppressing absorption rate of irradiated waves

Families Citing this family (51)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6335622B1 (en) * 1992-08-25 2002-01-01 Superconductor Technologies, Inc. Superconducting control elements for RF antennas
JP2003500133A (en) * 1999-05-21 2003-01-07 ザ ゼネラル ホスピタル コーポレーション rf coil imaging system
US7598739B2 (en) 1999-05-21 2009-10-06 Regents Of The University Of Minnesota Radio frequency gradient, shim and parallel imaging coil
EP2034325A1 (en) * 2000-07-31 2009-03-11 Regents of the University of Minnesota Open tem resonators for mri
US6727703B2 (en) * 2002-05-17 2004-04-27 General Electric Company Method and apparatus for decoupling RF detector arrays for magnetic resonance imaging
US6980000B2 (en) * 2003-04-29 2005-12-27 Varian, Inc. Coils for high frequency MRI
US7560927B2 (en) * 2003-08-28 2009-07-14 Massachusetts Institute Of Technology Slitted and stubbed microstrips for high sensitivity, near-field electromagnetic detection of small samples and fields
US7908690B2 (en) * 2003-09-30 2011-03-22 Sentinelle Medical, Inc. Supine patient support for medical imaging
US7379769B2 (en) 2003-09-30 2008-05-27 Sunnybrook Health Sciences Center Hybrid imaging method to monitor medical device delivery and patient support for use in the method
US7970452B2 (en) 2003-09-30 2011-06-28 Hologic, Inc. Open architecture imaging apparatus and coil system for magnetic resonance imaging
WO2005052623A1 (en) * 2003-11-19 2005-06-09 General Electric Company (A New York Corporation) Spine phased array coil comprising spatially shifted coil elements
DE102004006322B4 (en) 2004-02-10 2013-09-12 RAPID Biomedizinische Geräte RAPID Biomedical GmbH Imaging device for use of nuclear magnetic resonance
EP1751571A2 (en) * 2004-05-07 2007-02-14 Regents Of The University Of Minnesota Multi-current elements for magnetic resonance radio frequency coils
ES2297358T3 (en) * 2004-07-30 2008-05-01 Nexans cylindrical superconducting component and its use as resistive current limiter.
US7914589B2 (en) * 2004-08-03 2011-03-29 Daikin Industries, Ltd. Fluorine-containing urethanes
EP1624314A1 (en) 2004-08-05 2006-02-08 Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. Helmet-shaped TEM antenna for magnetic resonance measurements
US7427861B2 (en) * 2005-04-11 2008-09-23 Insight Neuroimaging Systems, Llc Dual-tuned microstrip resonator volume coil
US9568572B2 (en) 2005-05-06 2017-02-14 Regents Of The University Of Minnesota Bandage or garment combined with a wirelessly coupled magnetic resonance coil
CA2626678A1 (en) * 2005-10-18 2007-04-26 Tursiop Technologies, Llc Method and apparatus for high-gain magnetic resonance imaging
US7420371B2 (en) * 2006-01-04 2008-09-02 Enh Research Institute Slab-selective RF coil for MR system
JP5179019B2 (en) * 2006-04-04 2013-04-10 株式会社日立製作所 Coil system and a nuclear magnetic resonance imaging apparatus using the same
US7498813B2 (en) * 2006-05-04 2009-03-03 General Electric Company Multi-channel low loss MRI coil
WO2007138547A3 (en) 2006-05-30 2008-05-02 Christian Findeklee Detuning a radio-frequency coil
EP2054733A1 (en) * 2006-08-15 2009-05-06 Philips Electronics N.V. Tunable and/or detunable mr receive coil arrangements
EP2115485A1 (en) * 2007-02-26 2009-11-11 Philips Electronics N.V. Doubly resonant high field radio frequency surface coils for magnetic resonance
WO2008135943A1 (en) * 2007-05-03 2008-11-13 Philips Intellectual Property & Standards Gmbh Transverse electromagnetic radio-frequency coil
US7816918B2 (en) * 2007-05-24 2010-10-19 The Johns Hopkins University Optimized MRI strip array detectors and apparatus, systems and methods related thereto
DE502007006948D1 (en) * 2007-09-28 2011-05-26 Max Planck Gesellschaft Stripline antenna and antenna arrangement for a magnetic resonance apparatus
US8290569B2 (en) * 2007-11-23 2012-10-16 Hologic, Inc. Open architecture tabletop patient support and coil system
US8559186B2 (en) * 2008-04-03 2013-10-15 Qualcomm, Incorporated Inductor with patterned ground plane
WO2009125320A1 (en) * 2008-04-09 2009-10-15 Koninklijke Philips Electronics N.V. Double layer multi element rf strip coil array for sar reduced high field mr
US20110074422A1 (en) * 2008-05-02 2011-03-31 The Regents Of The University Of California The Office Of The President Method and apparatus for magnetic resonance imaging and spectroscopy using multiple-mode coils
US8299681B2 (en) 2009-03-06 2012-10-30 Life Services, LLC Remotely adjustable reactive and resistive electrical elements and method
US8747331B2 (en) 2009-06-23 2014-06-10 Hologic, Inc. Variable angle guide holder for a biopsy guide plug
US8125226B2 (en) * 2009-07-02 2012-02-28 Agilent Technologies, Inc. Millipede surface coils
US9160079B2 (en) * 2011-09-14 2015-10-13 William N. Carr Compact multi-band antenna
US8854042B2 (en) 2010-08-05 2014-10-07 Life Services, LLC Method and coils for human whole-body imaging at 7 T
US8604791B2 (en) 2010-09-09 2013-12-10 Life Services, LLC Active transmit elements for MRI coils and other antenna devices
US9332926B2 (en) 2010-11-25 2016-05-10 Invivo Corporation MRI imaging probe
US9097769B2 (en) 2011-02-28 2015-08-04 Life Services, LLC Simultaneous TX-RX for MRI systems and other antenna devices
US9057767B2 (en) * 2011-05-07 2015-06-16 The University Of Utah Linear phase microstrip radio frequency transmit coils
CN104011556B (en) * 2011-10-10 2017-03-08 皇家飞利浦有限公司 Used magnetic resonance transverse electromagnetic (TEM) coil RF
CN204394509U (en) 2011-11-01 2015-06-17 株式会社日立医疗器械 The magnetic resonance imaging apparatus and an antenna device
US9500727B2 (en) 2012-04-20 2016-11-22 Regents Of The University Of Minnesota System and method for control of RF circuits for use with an MRI system
US20140049259A1 (en) * 2012-08-17 2014-02-20 Lockheed Martin Corporation Resonant magnetic ring antenna
CN103767705B (en) 2012-10-23 2017-12-22 三星电子株式会社 The magnetic resonance imaging system and a magnetic resonance imaging method
CA2902592A1 (en) 2013-03-15 2014-09-18 Synaptive Medical (Barbados) Inc. Insert imaging device for surgical procedures
WO2014150274A1 (en) 2013-03-15 2014-09-25 Hologic, Inc. System and method for reviewing and analyzing cytological specimens
KR101541236B1 (en) * 2014-03-11 2015-08-03 울산대학교 산학협력단 Radio frequency resonator and magnetic resonance imaging apparatus comprising the same
KR101635641B1 (en) * 2014-04-22 2016-07-20 한국표준과학연구원 Microstrip-based RF surface receive coil for the acquisition of MR images and RF resonator having thereof
US9891299B1 (en) * 2014-05-19 2018-02-13 General Electric Company Methods and systems for correcting B0 field in MRI imaging using shim coils

Citations (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4439733A (en) * 1980-08-29 1984-03-27 Technicare Corporation Distributed phase RF coil
US4620155A (en) * 1984-08-16 1986-10-28 General Electric Company Nuclear magnetic resonance imaging antenna subsystem having a plurality of non-orthogonal surface coils
US4626800A (en) * 1984-06-05 1986-12-02 Sony Corporation YIG thin film tuned MIC oscillator
US4679015A (en) * 1985-03-29 1987-07-07 Sony Corporation Ferromagnetic resonator
US4686473A (en) * 1984-07-10 1987-08-11 Thomson-Cgr Device for creating and/or receiving an alternating magnetic field for an apparatus using nuclear magnetic resonance
US4704739A (en) * 1984-06-05 1987-11-03 Sony Corporation Receiving circuit for converting signals comprising at least two ferromagnetic resonators
US4712067A (en) * 1983-12-30 1987-12-08 U.S. Philips Corporation R.F. coil system for generating and/or receiving alternating magnetic fields
US4751464A (en) * 1987-05-04 1988-06-14 Advanced Nmr Systems, Inc. Cavity resonator with improved magnetic field uniformity for high frequency operation and reduced dielectric heating in NMR imaging devices
US4792760A (en) * 1986-02-07 1988-12-20 Thomson-Cgr Reception antenna for optical image formation device using nuclear magnetic resonance
US4835472A (en) * 1987-08-13 1989-05-30 Siemens Aktiengesellschaft Local coil for detecting nuclear magnetic resonance signals from an examination subject
US4839594A (en) * 1987-08-17 1989-06-13 Picker International, Inc. Faraday shield localized coil for magnetic resonance imaging
US4983936A (en) * 1986-07-02 1991-01-08 Sony Corporation Ferromagnetic resonance device
US5006805A (en) * 1988-09-23 1991-04-09 Siemens Aktiengesellschaft Surface coil arrangement for use in a nuclear magnetic resonance apparatus
US5185573A (en) * 1991-04-16 1993-02-09 Hewlett-Packard Company Method for focusing of magnetic resonance images
US5270656A (en) * 1992-04-24 1993-12-14 The Trustees Of The University Of Pennsylvania Biplanar RF coils for magnetic resonance imaging or spectroscopy
US5363113A (en) * 1987-05-07 1994-11-08 General Electric Cgr S.A. Electromagnetic antenna and excitation antenna provided with such electromagnetic antenna for a nuclear magnetic resonance apparatus
US5514337A (en) * 1994-01-11 1996-05-07 American Research Corporation Of Virginia Chemical sensor using eddy current or resonant electromagnetic circuit detection
US5530424A (en) * 1994-09-16 1996-06-25 General Electric Company Apparatus and method for high data rate communication in a computerized tomography system
US5530425A (en) * 1994-09-16 1996-06-25 General Electric Company Radiation shielded apparatus for high data rate communication in a computerized tomography system
US5557247A (en) * 1993-08-06 1996-09-17 Uab Research Foundation Radio frequency volume coils for imaging and spectroscopy
US5646962A (en) * 1994-12-05 1997-07-08 General Electric Company Apparatus for reducing electromagnetic radiation from a differentially driven transmission line used for high data rate communication in a computerized tomography system
US5739812A (en) * 1996-07-18 1998-04-14 Cipher Co. Ltd. System for inputting image and commond using three-dimensional mouse capable of generating, in real time, three-dimensional image
US5757189A (en) * 1996-11-27 1998-05-26 Picker International, Inc. Arbitrary placement multimode coil system for MR imaging
US5886596A (en) * 1993-08-06 1999-03-23 Uab Research Foundation Radio frequency volume coils for imaging and spectroscopy
US5898306A (en) * 1997-04-09 1999-04-27 Regents Of The University Of Minnesota Single circuit ladder resonator quadrature surface RF coil
US5903198A (en) * 1997-07-30 1999-05-11 Massachusetts Institute Of Technology Planar gyrator
US5949311A (en) * 1997-06-06 1999-09-07 Massachusetts Institute Of Technology Tunable resonators
US5990681A (en) * 1997-10-15 1999-11-23 Picker International, Inc. Low-cost, snap-in whole-body RF coil with mechanically switchable resonant frequencies
US5998999A (en) * 1996-12-12 1999-12-07 Picker International, Inc. Volume RF coils with integrated high resolution focus coils for magnetic resonance imaging
US6023166A (en) * 1997-11-19 2000-02-08 Fonar Corporation MRI antenna
US6054854A (en) * 1996-07-31 2000-04-25 Kabushiki Kaisha Toshiba Arrangement of coil windings for MR systems
US6054856A (en) * 1998-04-01 2000-04-25 The United States Of America As Represented By The Secretary Of The Navy Magnetic resonance detection coil that is immune to environmental noise
US6060882A (en) * 1995-12-29 2000-05-09 Doty Scientific, Inc. Low-inductance transverse litz foil coils
US6133737A (en) * 1997-05-26 2000-10-17 Siemens Aktiengesellschaft Circularly polarizing antenna for a magnetic resonance apparatus
US6215307B1 (en) * 1998-04-14 2001-04-10 Picker Nordstar Oy Coils for magnetic resonance imaging
US6232779B1 (en) * 1999-08-25 2001-05-15 General Electric Company NMR RF coil with improved resonant tuning and field containment
US20020018043A1 (en) * 2000-06-14 2002-02-14 Masahiro Nakanishi Electrophoretic display device and process for production thereof
US6369570B1 (en) * 2000-12-21 2002-04-09 Varian, Inc. B1 gradient coils
US6396271B1 (en) * 1999-09-17 2002-05-28 Philips Medical Systems (Cleveland), Inc. Tunable birdcage transmitter coil
US6420871B1 (en) * 2001-03-02 2002-07-16 Varian, Inc. Multiple tuned birdcage coils
US6501274B1 (en) * 1999-10-15 2002-12-31 Nova Medical, Inc. Magnetic resonance imaging system using coils having paraxially distributed transmission line elements with outer and inner conductors
US6633161B1 (en) * 1999-05-21 2003-10-14 The General Hospital Corporation RF coil for imaging system

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3668569A (en) * 1970-05-27 1972-06-06 Hazeltine Corp Distributed-constant dispersive network
US4543543A (en) * 1982-12-03 1985-09-24 Raytheon Company Magnetically tuned resonant circuit
JP2503993B2 (en) 1986-08-29 1996-06-05 オムロン株式会社 Processing unit of the paper sheet
JP3079592B2 (en) 1991-01-31 2000-08-21 株式会社島津製作所 Mri for surface coil
JPH07321514A (en) * 1994-05-25 1995-12-08 Sony Corp Ferromagnetic resonator
FR2749286B1 (en) 1996-06-04 1998-09-04 Bernard Frederic Conveying device objects provided with necks or similar such as, for example, bottles, vials or other such objects and loading device designed for said conveying device
CN1306622A (en) 1998-04-22 2001-08-01 西南研究会 Porosity and permeability measurement of underground formations contg. crude oil, using epr response data
JP2000171208A (en) * 1998-12-04 2000-06-23 Toyota Motor Corp Slide type position detecting device
JP2004511278A (en) * 2000-10-09 2004-04-15 リージェンツ オブ ザ ユニバーシティ オブ ミネソタ Using the micro-strip transmission line coil, a method and apparatus for magnetic resonance imaging and spectroscopy
US6771070B2 (en) * 2001-03-30 2004-08-03 Johns Hopkins University Apparatus for magnetic resonance imaging having a planar strip array antenna including systems and methods related thereto

Patent Citations (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4439733A (en) * 1980-08-29 1984-03-27 Technicare Corporation Distributed phase RF coil
US4712067A (en) * 1983-12-30 1987-12-08 U.S. Philips Corporation R.F. coil system for generating and/or receiving alternating magnetic fields
US4626800A (en) * 1984-06-05 1986-12-02 Sony Corporation YIG thin film tuned MIC oscillator
US4704739A (en) * 1984-06-05 1987-11-03 Sony Corporation Receiving circuit for converting signals comprising at least two ferromagnetic resonators
US4686473A (en) * 1984-07-10 1987-08-11 Thomson-Cgr Device for creating and/or receiving an alternating magnetic field for an apparatus using nuclear magnetic resonance
US4620155A (en) * 1984-08-16 1986-10-28 General Electric Company Nuclear magnetic resonance imaging antenna subsystem having a plurality of non-orthogonal surface coils
US4679015A (en) * 1985-03-29 1987-07-07 Sony Corporation Ferromagnetic resonator
US4792760A (en) * 1986-02-07 1988-12-20 Thomson-Cgr Reception antenna for optical image formation device using nuclear magnetic resonance
US4983936A (en) * 1986-07-02 1991-01-08 Sony Corporation Ferromagnetic resonance device
US4751464A (en) * 1987-05-04 1988-06-14 Advanced Nmr Systems, Inc. Cavity resonator with improved magnetic field uniformity for high frequency operation and reduced dielectric heating in NMR imaging devices
US5363113A (en) * 1987-05-07 1994-11-08 General Electric Cgr S.A. Electromagnetic antenna and excitation antenna provided with such electromagnetic antenna for a nuclear magnetic resonance apparatus
US4835472A (en) * 1987-08-13 1989-05-30 Siemens Aktiengesellschaft Local coil for detecting nuclear magnetic resonance signals from an examination subject
US4839594A (en) * 1987-08-17 1989-06-13 Picker International, Inc. Faraday shield localized coil for magnetic resonance imaging
US5006805A (en) * 1988-09-23 1991-04-09 Siemens Aktiengesellschaft Surface coil arrangement for use in a nuclear magnetic resonance apparatus
US5185573A (en) * 1991-04-16 1993-02-09 Hewlett-Packard Company Method for focusing of magnetic resonance images
US5270656A (en) * 1992-04-24 1993-12-14 The Trustees Of The University Of Pennsylvania Biplanar RF coils for magnetic resonance imaging or spectroscopy
US5557247A (en) * 1993-08-06 1996-09-17 Uab Research Foundation Radio frequency volume coils for imaging and spectroscopy
US5886596A (en) * 1993-08-06 1999-03-23 Uab Research Foundation Radio frequency volume coils for imaging and spectroscopy
US5514337A (en) * 1994-01-11 1996-05-07 American Research Corporation Of Virginia Chemical sensor using eddy current or resonant electromagnetic circuit detection
US5530425A (en) * 1994-09-16 1996-06-25 General Electric Company Radiation shielded apparatus for high data rate communication in a computerized tomography system
US5530424A (en) * 1994-09-16 1996-06-25 General Electric Company Apparatus and method for high data rate communication in a computerized tomography system
US5646962A (en) * 1994-12-05 1997-07-08 General Electric Company Apparatus for reducing electromagnetic radiation from a differentially driven transmission line used for high data rate communication in a computerized tomography system
US6060882A (en) * 1995-12-29 2000-05-09 Doty Scientific, Inc. Low-inductance transverse litz foil coils
US5739812A (en) * 1996-07-18 1998-04-14 Cipher Co. Ltd. System for inputting image and commond using three-dimensional mouse capable of generating, in real time, three-dimensional image
US6054854A (en) * 1996-07-31 2000-04-25 Kabushiki Kaisha Toshiba Arrangement of coil windings for MR systems
US5757189A (en) * 1996-11-27 1998-05-26 Picker International, Inc. Arbitrary placement multimode coil system for MR imaging
US5998999A (en) * 1996-12-12 1999-12-07 Picker International, Inc. Volume RF coils with integrated high resolution focus coils for magnetic resonance imaging
US5898306A (en) * 1997-04-09 1999-04-27 Regents Of The University Of Minnesota Single circuit ladder resonator quadrature surface RF coil
US6133737A (en) * 1997-05-26 2000-10-17 Siemens Aktiengesellschaft Circularly polarizing antenna for a magnetic resonance apparatus
US5949311A (en) * 1997-06-06 1999-09-07 Massachusetts Institute Of Technology Tunable resonators
US5903198A (en) * 1997-07-30 1999-05-11 Massachusetts Institute Of Technology Planar gyrator
US5990681A (en) * 1997-10-15 1999-11-23 Picker International, Inc. Low-cost, snap-in whole-body RF coil with mechanically switchable resonant frequencies
US6023166A (en) * 1997-11-19 2000-02-08 Fonar Corporation MRI antenna
US6054856A (en) * 1998-04-01 2000-04-25 The United States Of America As Represented By The Secretary Of The Navy Magnetic resonance detection coil that is immune to environmental noise
US6215307B1 (en) * 1998-04-14 2001-04-10 Picker Nordstar Oy Coils for magnetic resonance imaging
US6633161B1 (en) * 1999-05-21 2003-10-14 The General Hospital Corporation RF coil for imaging system
US6232779B1 (en) * 1999-08-25 2001-05-15 General Electric Company NMR RF coil with improved resonant tuning and field containment
US6396271B1 (en) * 1999-09-17 2002-05-28 Philips Medical Systems (Cleveland), Inc. Tunable birdcage transmitter coil
US6501274B1 (en) * 1999-10-15 2002-12-31 Nova Medical, Inc. Magnetic resonance imaging system using coils having paraxially distributed transmission line elements with outer and inner conductors
US20020018043A1 (en) * 2000-06-14 2002-02-14 Masahiro Nakanishi Electrophoretic display device and process for production thereof
US6369570B1 (en) * 2000-12-21 2002-04-09 Varian, Inc. B1 gradient coils
US6420871B1 (en) * 2001-03-02 2002-07-16 Varian, Inc. Multiple tuned birdcage coils

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060277749A1 (en) * 2000-10-09 2006-12-14 Regents Of The University Of Minnesota Method and apparatus for magnetic resonance imaging and spectroscopy using microstrip transmission line coils
US20060158191A1 (en) * 2003-08-21 2006-07-20 Insight Neuroimaging Systems, Llc Microstrip coil design for MRI apparatus
US7202668B2 (en) * 2003-08-21 2007-04-10 Insight Neuroimaging Systems, Llc Microstrip coil design for MRI apparatus
US20070192103A1 (en) * 2006-02-14 2007-08-16 Nobuo Sato Conversational speech analysis method, and conversational speech analyzer
US8036898B2 (en) 2006-02-14 2011-10-11 Hitachi, Ltd. Conversational speech analysis method, and conversational speech analyzer
US8423369B2 (en) 2006-02-14 2013-04-16 Hitachi, Ltd. Conversational speech analysis method, and conversational speech analyzer
US20110204890A1 (en) * 2008-10-29 2011-08-25 Hitachi Medical Corporation Antenna device and magnetic resonance imaging device
US8947084B2 (en) 2008-10-29 2015-02-03 Hitachi Medical Corporation Antenna device and magnetic resonance imaging device
US9599685B2 (en) 2010-10-07 2017-03-21 Hitachi, Ltd. Antenna device and magnetic resonance imaging device for suppressing absorption rate of irradiated waves
WO2016172650A1 (en) * 2015-04-24 2016-10-27 Massachusetts Institute Of Technology Micro magnetic resonance relaxometry

Also Published As

Publication number Publication date Type
JP2005270674A (en) 2005-10-06 application
US20020079996A1 (en) 2002-06-27 application
US20060277749A1 (en) 2006-12-14 application
JP2004511278A (en) 2004-04-15 application
EP1344076A1 (en) 2003-09-17 application
WO2002031522A1 (en) 2002-04-18 application
US7023209B2 (en) 2006-04-04 grant

Similar Documents

Publication Publication Date Title
l Mispelter et al. NMR probeheads for biophysical and biomedical experiments: theoretical principles & practical guidelines
US5898306A (en) Single circuit ladder resonator quadrature surface RF coil
US5179332A (en) NMR radio frequency coil with disable circuit
US5777474A (en) Radio-frequency coil and method for resonance imaging/analysis
US4649348A (en) Radio frequency coils for nuclear magnetic resonance imaging systems
US5185576A (en) Local gradient coil
US6087832A (en) Edge-wound solenoids and strongly coupled ring resonators for NMR and MRI
US5231346A (en) Field strength measuring instrument for the simultaneous detection of e and h fields
US5045792A (en) Split and non-circular magnetic resonance probes with optimum field uniformity
US5682098A (en) Open quadrature whole volume imaging NMR surface coil array including three figure-8 shaped surface coils
US4694255A (en) Radio frequency field coil for NMR
US6232779B1 (en) NMR RF coil with improved resonant tuning and field containment
US5243286A (en) Split shield for magnetic resonance imaging
US5212450A (en) Radio frequency volume resonator for nuclear magnetic resonance
US4439733A (en) Distributed phase RF coil
US7282915B2 (en) Multi-turn element RF coil array for multiple channel MRI
US6008649A (en) RF coil apparatus for MR system with lateral B0 field
US6608480B1 (en) RF coil for homogeneous quadrature transmit and multiple channel receive
US5467017A (en) Antenna arrangement for a nuclear magnetic resonance apparatus
US4642569A (en) Shield for decoupling RF and gradient coils in an NMR apparatus
US6771070B2 (en) Apparatus for magnetic resonance imaging having a planar strip array antenna including systems and methods related thereto
US5270656A (en) Biplanar RF coils for magnetic resonance imaging or spectroscopy
US6982554B2 (en) System and method for operating transmit or transmit/receive elements in an MR system
US4620155A (en) Nuclear magnetic resonance imaging antenna subsystem having a plurality of non-orthogonal surface coils
US5583438A (en) Inductively coupled dedicated RF coils for MRI

Legal Events

Date Code Title Description
AS Assignment

Owner name: NATIONAL INSTITUTES OF HEALTH (NIH), U.S. DEPT. OF

Free format text: CONFIRMATORY LICENSE;ASSIGNOR:REGENTS OF THE UNIVERSITY OF MINNESOTA;REEL/FRAME:030175/0372

Effective date: 20130403