Abstract:
A magnetic resonance (MR) system may include: a volume-type radio-frequency (RF) coil assembly having a volume coil with a plurality of ports and a ring coil with a plurality of ports (ρ') and which is situated about the volume-type coil; and at least one controller configured to selectively control a first transmit/receive (T/R) radio frequency (RF) channel to generate an output including RF quadrature signals to drive the volume-type coil and to selectively control a second T/R RF channel to generate an output including RF quadrature signals to drive the ring coil.
Abstract translation:磁共振(MR)系统可以包括:体积型射频(RF)线圈组件,其具有具有多个端口的体积线圈和具有多个端口(ρ')的环形线圈,并且围绕 体积型线圈; 以及至少一个控制器,被配置为选择性地控制第一发射/接收(T / R)射频(RF)信道以产生包括RF正交信号的输出,以驱动体积型线圈并选择性地控制第二T / R RF 通道以产生包括RF正交信号的输出来驱动环形线圈。
Abstract:
Embodiments of the present invention address the problems with previously known MRI enhancement resonators. The embodiments provide capacitances that are sufficiently large to result in resonance frequencies that are sufficiently low for medical MRI applications in devices that are sufficiently small for implantation into the body. Further, the capacitance and resonance frequency of the MRI enhancement resonator may be easily adjusted to particular desired values by selecting corresponding thin-film dielectrics, or thicknesses of such thin-film dielectrics. Moreover, the design and geometry of the embodiments provide MRI enhancement resonators with high Q-factors. The construction and material of such MRI enhancement resonators also yield flexible and biocompatible devices that are appropriate for applications involving implantation into the body.
Abstract:
Embodiments of the invention are directed toward a crossed-loop electron paramagnetic resonance resonator comprising a first resonator having a first resonator axis; and a second resonator having a second resonator axis. The first resonator axis and the second resonator axis can be substantially perpendicular. Either or both the first resonator and the second resonator can be a ribbon resonator having a plurality of metallic ribbons formed in a loop. Each metallic ribbon can include a central axis. The plurality of metallic ribbons can be arranged parallel relative one to another.
Abstract:
The present invention provides resonance circuits, detection devices incorporating such circuits, and methods for their design, construction, and use.
Abstract:
An NMR probe which includes a probe matrix (24) having a void sample (28) volume therein. A conductive coil (16, 26) can be at least partially embedded in the probe matrix (24). By embedding the conductive coil (16, 26) in the probe matrix (24), the fill-factor can be significantly increased. NMR probes can be formed by a method which includes wrapping a conductive wire (16) around a coil form (18) to produce a coil precursor assembly. The probe matrix (24) can be formed around the conductive wire and coil form with a matrix material using any suitable technique such as soft lithography and/or molding. The coil form can be removed from the probe matrix leaving a void sample volume (28) in the probe matrix. Advantageously, the NMR probes of the present invention allow for fill-factors approaching and achieving 100%.
Abstract:
A downhole micro MR analyzer for use in a wellbore, having a micro sample tube, a micro RF coil (14) in close proximity to the micro sample tube (16), and one or more magnets (12) disposed about the micro sample tube (16) is disclosed. The micro MR analyzer can be used for nuclear magnetic resonance or electron spin resonance experiments to ascertain formation properties and chemical compositions.
Abstract:
The present invention concerns an apparatus (1' ) for NMR spectroscopy and/or NMR imaging of a sample. The apparatus comprises a static probe comprising an outer coil for excitation of nuclei of said sample by generating an incident radio frequency field at the Larmor frequency of said nuclei, and for reception of a return radio frequency field emitted by said sample, and a sensitive inner coil (6a' ) which is mounted closely around or in contact with the sample container and which is wirelessly coupled to said outer coil by an electromagnetic radio frequency field. The sensitive inner coil is embedded in an inner spinning rotor (2) which is rotatively mounted inside said static probe and which is integral with said sample container, so that the filling factor and the radio frequency field amplitude in said sensitive coil are maximized.
Abstract:
An NMR probe which includes a probe matrix (24) having a void sample (28) volume therein. A conductive coil (16, 26) can be at least partially embedded in the probe matrix (24). By embedding the conductive coil (16, 26) in the probe matrix (24), the fill-factor can be significantly increased. NMR probes can be formed by a method which includes wrapping a conductive wire (16) around a coil form (18) to produce a coil precursor assembly. The probe matrix (24) can be formed around the conductive wire and coil form with a matrix material using any suitable technique such as soft lithography and/or molding. The coil form can be removed from the probe matrix leaving a void sample volume (28) in the probe matrix. Advantageously, the NMR probes of the present invention allow for fill-factors approaching and achieving 100%.
Abstract:
The present invention concerns an apparatus (1') and a method for NMR spectroscopy and/or NMR imaging of at least one sample. The apparatus of the invention comprises: at least one sample container (3) comprising a sampling volume (3a) which is designed to be filled by said sample and to be subjected to an electromagnetic radio frequency field, and a static probe comprising an energizing circuit for excitation of nuclei of said at least one sample by generating an incident radio frequency field at the Larmor frequency of said nuclei, and for reception of a return radio frequency field emitted by said at least one sample, said apparatus comprising at least one sensitive coil (6a') which is mounted closely around or in contact with said sample container and which is coupled to said static probe by an electromagnetic radio frequency field. This apparatus is characterized in that said sensitive coil is embedded in an inner spinning rotor (2) which is rotatively mounted inside said static probe and which is integral with said sample container, so that both the filling factor and the radio frequency field amplitude in said sensitive coil are maximized.