Simultaneous spatial and spectral selective excitation

Using a k‐space interpretation of small‐tip excitation, a single excitation pulse has been designed that is simultaneously selective in space and resonant frequency. An analytic expression for the response of this pulse has been derived. The pulse has been implemented on a 1.5‐T imaging system. The pulse has been applied to a rapid gradient‐echo imaging sequence that forms both water and fat images within a breath‐holding interval. These rapid images are free of the chemical shift artifacts at organ boundaries that typically afflict conventional rapid images. The pulse can be applied to a variety of other sequences, such as multislice water/fat sequences and rapid k‐space scanning. © 1990 Academic Press, Inc.

[1]  S. Patz,et al.  Rapid Fourier imaging using steady‐state free precession , 1987, Magnetic resonance in medicine.

[2]  Joël Mispelter,et al.  Chemical shift-specific slice selection. A new method for chemical shift imaging at high magnetic field , 1987 .

[3]  S. Ljunggren.  A simple graphical representation of fourier-based imaging methods , 1983 .

[4]  P M Joseph,et al.  A Spin Echo Chemical Shift MR Imaging Technique , 1985, Journal of computer assisted tomography.

[5]  A. Haase,et al.  Rapid NMR Imaging Using Low Flip-Angle Pulses , 2004 .

[6]  C L Dumoulin.  A Method for Chemical‐Shift‐Selective Imaging , 1985, Magnetic resonance in medicine.

[7]  A. Macovski,et al.  Optimal Control Solutions to the Magnetic Resonance Selective Excitation Problem , 1986, IEEE Transactions on Medical Imaging.

[8]  K. Uğurbil,et al.  NMR chemical shift imaging in three dimensions. , 1982, Proceedings of the National Academy of Sciences of the United States of America.

[9]  A. Lent,et al.  Computer-optimized narrowband pulses for multislice imaging , 1987 .

[10]  J. Cuppen,et al.  Very fast MR imaging by field echoes and small angle excitation. , 1985, Magnetic resonance imaging.

[11]  Z H Cho,et al.  Gradient reversal technique and its applications to chemical‐shift‐related NMR imaging , 1987, Magnetic resonance in medicine.

[12]  D. Twieg.  The k-trajectory formulation of the NMR imaging process with applications in analysis and synthesis of imaging methods. , 1983, Medical physics.

[13]  M. Gyngell,et al.  The application of steady-state free precession in rapid 2DFT NMR imaging: FAST and CE-FAST sequences. , 1988, Magnetic resonance imaging.