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Axially constrained NMR RF probe coil

A coil and probe technology, applied in the field of RF coupling, can solve problems such as loss of independent RF field

Inactive Publication Date: 2008-09-10
AGILENT TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the cavity structure provides axial and radial confinement of the field distribution, it loses the ability to apply an independent RF field to the sample from outside such resonators

Method used

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  • Axially constrained NMR RF probe coil
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  • Axially constrained NMR RF probe coil

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Embodiment Construction

[0020] figure 1 The background of the invention is explained conceptually (the same reference numerals appear in several figures to denote the same objects). The NMR probe 9 is arranged in the bore 11 of the superconducting magnet 10 . The sample to be analyzed is presented in a sample container (not shown) which is inserted into the probe 9 . The probe 9 is inductively coupled to the nuclear spins of the sample for excitation via at least a first RF excitation channel 12 and additionally separate signal acquisition via a receive channel 14 . The excitation and reception functions are often non-concurrently operated by sharing the same probe coil through the correlator 13, but multiple coils are often used to provide different functions, such as spin decoupling, field frequency locking, etc. The receive path typically includes a preamplifier and RF demodulator, phase detector, analog-to-digital conversion (ADC) and various signal processing devices, along with a digital proc...

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Abstract

An NMR resonant structure is formed of axial conductors (54a, 54b, 54c, and 54d) and end members (50,51), supporting said conductors to form a coil structure (8) of desired electrical topology wherein the end members combine the function of RF interconnects between selected axial conductors (inductors) with an axial constraint on RF field prevailing outside the axial bounds of the end members, and if so desired, comprise a selected capacitance 61 for the resonant structure.

Description

Background technique [0001] The present invention relates to nuclear magnetic resonance (NMR) apparatus and in particular to RF coupling to nuclei of a sample under investigation. This is a function of the module, broadly referred to as the NMR probe, that controls the distribution of the RF field within the sensitive region. The sample in the sensitive region is tightly coupled to RF radiation generated in the sensitive region so that the spins are excited and subsequently emitted as the sample nuclei are de-excited. The heart of this probe is the RF coil and a notable property of such coils in typical use is the degree of homogeneity of the RF field obtained within the entire sensitive volume bounded by the coil. It is also desirable to confine the RF field distribution of the coil to a limited region within the sensitive volume, since spatial variations of the polarizing magnetic field are not canceled outside the sensitive volume. [0002] Limiting the spatial distributi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/34
CPCG01R33/34092G01R33/34076G01R33/34069
Inventor A·P·曾斯P·纳卡塔尼
Owner AGILENT TECH INC