INVIVO PROTON SPECTROSCOPY IN PRESENCE OF EDDY CURRENTS
INVIVO PROTON SPECTROSCOPY IN PRESENCE OF EDDY CURRENTS
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DOI：
10.1002/mrm.1910140104
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发表时间：
1990-04-01
影响因子：
3.3
通讯作者：
KLOSE, U
中科院分区：
文献类型：
--
作者：
KLOSE, U
光谱学中的空间局部化方法通常与用于体积选择的磁场梯度一起操作。由这些梯度引起的涡电流在所选体积中产生共振频率的时间依赖性偏移，这导致傅立叶变换后的频谱失真。在全身系统中，涡流的完全补偿是一个困难的过程。为了避免这种情况，提出了一种质子光谱的校正方法，该方法使用突出的水质子的信号作为水抑制信号的参考。在时域中执行校正，将水抑制信号除以每个数据点的水信号的相位因子。体模测量和志愿者的脑和肌肉光谱表明，校正后的光谱具有良好的分辨率。
Spatially localized methods in spectroscopy often operate with magnetic field gradients for volume selection. The eddy currents induced by these gradients produce time-dependent shifts of the resonance frequency in the selected volume, which results in a distortion of the spectrum after Fourier transformation. In whole-body systems the complete compensation of eddy currents is a difficult procedure. To avoid this, a correction method is proposed for proton spectroscopy, which uses the signal of prominent water protons as a reference for the water-suppressed signal. The correction is performed in the time domain, dividing the water-suppressed signal by the phase factor of the water signal for each data point. The corrected spectra have a good resolution as shown by phantom measurements and brain and muscle spectra of volunteers.