Four dimensional spectral-spatial fat saturation pulse design
Article first published online: 17 DEC 2013
© 2013 Wiley Periodicals, Inc.
Magnetic Resonance in Medicine
Volume 72, Issue 6, pages 1637–1647, December 2014
How to Cite
Zhao, F., Nielsen, J.-F. and Noll, D. C. (2014), Four dimensional spectral-spatial fat saturation pulse design. Magn Reson Med, 72: 1637–1647. doi: 10.1002/mrm.25076
- Issue published online: 11 NOV 2014
- Article first published online: 17 DEC 2013
- Manuscript Accepted: 19 NOV 2013
- Manuscript Revised: 26 OCT 2013
- Manuscript Received: 6 AUG 2013
- National Institutes of Health. Grant Number: R01NS058576
- fat saturation;
- pulse design;
- spectral-spatial pulse;
- parallel excitation;
- B0 inhomogeneity;
- B1 inhomogeneity
The conventional spectrally selective fat saturation pulse may perform poorly with inhomogeneous amplitude of static (polarizing) field (B0) and/or amplitude of (excitation) radiofrequency field (B1) fields. We propose a four dimensional spectral-spatial fat saturation pulse that is more robust to inhomogeneity and also shorter than the conventional fat saturation pulse.
The proposed pulse is tailored for local B0 inhomogeneity, which avoids the need of a sharp transition band in the spectral domain, so it improves both performance and pulse length. Furthermore, it can also compensate for B1 inhomogeneity. The pulse is designed sequentially by small-tip-angle approximation design and an automatic rescaling procedure.
The proposed method is compared to the conventional fat saturation in phantom experiments and in vivo knee imaging at 3 T for both single-channel and parallel excitation versions.
Compared to the conventional method, the proposed method produces superior fat suppression in the presence of B0 and B1 inhomogeneity and reduces pulse length by up to half of the standard length.
The proposed four dimensional spectral-spatial fat saturation suppresses fat more robustly with shorter pulse length than the conventional fat saturation in the presence of B0 and B1 inhomogeneity. Magn Reson Med 72:1637–1647, 2014. © 2013 Wiley Periodicals, Inc.