Abstract
Miniaturized NMR is of growing importance in bio-, chemical, and -material sciences. Other than the magnet, bulky components are the radio-frequency power amplifier and the power supply or battery pack. We show that constant flip-angle excitation with phase modulation following a particular type of polyphase perfect sequences results in low peak excitation power at high response peak power. It has ideal power distribution in both the time domain and the frequency domain. A savings in peak excitation power of six orders of magnitude has been realized compared to conventionally pulsed excitation. Among others, the excitation promises to be of use for button-cell operated miniature NMR devices as well as for complying with specific-absorption-rate regulations in high-field medical imaging. (C) 2009 Elsevier Inc. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 18-24 |
| Number of pages | 7 |
| Journal | Journal of Magnetic Resonance |
| Volume | 199 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jul 2009 |
| MoE publication type | A1 Journal article-refereed |
Funding
Helpful discussions with J. Perlo and F. Casanova are gratefully acknowledged as well as the help of Michael Adams in measuring the RF power. M. Greferath acknowledges funding from the 2006 UCD Seed Funding Scheme, and further support by the Claude-Shannon Institute for Discrete Mathematics, Coding and Cryptography (SFI Grant 06/MI/006).
Keywords
- integer residue rings
- polyphase perfect sequences
- Frank sequences
- Chu sequences
- excitation
- NMR
- MRI
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