Three-dimensional spectral-spatial excitation
Three-dimensional spectral-spatial excitation
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DOI：
10.1002/mrm.1910370314
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发表时间：
1997-03-01
影响因子：
3.3
通讯作者：
Macovski, A
中科院分区：
文献类型：
--
作者：
Morrell, G;Macovski, A
A method of three-dimensional spectral-spatial excitation is presented which is selective simultaneously in two spatial dimensions and in the spectral or chemical shift dimension, This method can be used to create spectral passbands whose center frequency varies as a function of spatial location within an imaging plane. This variation of passband center frequency may be specified by an acquired main field (B-0) map; the resulting excitations compensate for inhomogeneity of the B-0 field. In vivo images are presented in which three-dimensional spectral-spatial excitation allows selective water-only imaging in the presence of large B, inhomogeneity where conventional spectrally selective imaging fails, Phantom studies give a detailed profile of the performance of three-dimensional spectral-spatial pulses suitable for water-only or fat-saturation imaging, These pulses may also be useful for fat and water suppression in spectroscopic imaging. Performance constraints imposed by limited gradient slew rates are analyzed and quantified.
