Nuclear magnetic resonance apparatus having at least two transmission
frequencies
    1.
    发明授权
    Nuclear magnetic resonance apparatus having at least two transmission frequencies 失效
    具有至少两个发射频率的核磁共振装置

    公开(公告)号:US5442292A

    公开(公告)日:1995-08-15

    申请号:US282505

    申请日:1994-08-01

    IPC分类号: G01R33/36 G01R33/62 G01V3/00

    CPC分类号: G01R33/3607 G01R33/62

    摘要: For improving the spectral resolution and/or the signal-to-noise ratio of a nuclear magnetic resonance apparatus for examining first types of atomic nuclei that are nuclear-magnetically coupled to second types of atomic nuclei, signals are additionally emitted on the resonant frequency of the second type of atomic nucleus during the examination of the first type of atomic nucleus. To this end, the nuclear magnetic resonance apparatus includes a reception channel and only one transmission channel for both resonant frequencies. The transmission channel contains a respective synthesizer for each resonant frequency, which define the transmission frequency and contains a modulator unit shared in common by both resonant frequencies.

    摘要翻译: 为了提高核磁共振装置的光谱分辨率和/或信噪比,用于检查核磁耦合到第二类原子核的第一类原子核,信号在 在第一类原子核的检查过程中的第二种原子核。 为此,核磁共振装置包括两个谐振频率的接收信道和仅一个传输信道。 传输通道包含用于每个共振频率的相应合成器,其定义传输频率并且包含由两个谐振频率共同共享的调制器单元。

    Chemical shift imaging
    2.
    发明授权
    Chemical shift imaging 失效
    化学位移成像

    公开(公告)号:US5189370A

    公开(公告)日:1993-02-23

    申请号:US746451

    申请日:1991-08-16

    IPC分类号: G01R33/485 G01R33/62

    CPC分类号: G01R33/62 G01R33/485

    摘要: A method for chemical shift imaging is disclosed. A first radio frequency pulse at the resonance frequency of hydrogen and second radio frequency pulse at the resonance frequency of atoms to be examined are applied. Spatial resolution is obtained by phase encoding gradients. The repetition time is shorter than the spin-lattice relaxation time. The first radio frequency pulse at the resonance frequency of hydrogen causes a Nuclear Overhauser Effect enhancement of the resonance line of the atoms to be examined.

    摘要翻译: 公开了一种化学位移成像方法。 应用在待测原子的共振频率处的氢共振频率的第一射频脉冲和第二射频脉冲。 通过相位编码梯度获得空间分辨率。 重复时间短于自旋晶格弛豫时间。 在氢的共振频率处的第一个射频脉冲导致待检查的原子的共振线的核超越效应增强。

    Nuclear magnetic resonance tomography apparatus having dynamically
localized shimming of the basic magnetic field
    5.
    发明授权
    Nuclear magnetic resonance tomography apparatus having dynamically localized shimming of the basic magnetic field 失效
    核磁共振断层摄影装置具有基本磁场的动态局部匀场

    公开(公告)号:US5530352A

    公开(公告)日:1996-06-25

    申请号:US538360

    申请日:1995-10-03

    申请人: Heinrich Kolem

    发明人: Heinrich Kolem

    CPC分类号: G01R33/3875 G01R33/446

    摘要: In multi-slice methods, wherein at least one further slice is excited within the repetition time for a pulse sequence for the excitation and read-out of a slice the shimming ensues dynamically dependent on the respectively measured slice. The homogeneity in the excited slice can thus be improved compared to a global shimming.

    摘要翻译: 在多切片方法中,其中至少一个另外的切片在针对切片的激发和读出的脉冲序列的重复时间内被激发,匀场随动态地依赖于分别测量的切片。 因此,与全局匀场相比,激发切片中的均匀性可以得到改善。