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Titolo:
Improved broadband inversion performance for NMR in liquids
Autore:
Smith, MA; Hu, H; Shaka, AJ;
Indirizzi:
Univ Calif Irvine, Dept Chem, Irvine, CA 92697 USA Univ Calif Irvine Irvine CA USA 92697 ne, Dept Chem, Irvine, CA 92697 USA
Titolo Testata:
JOURNAL OF MAGNETIC RESONANCE
fascicolo: 2, volume: 151, anno: 2001,
pagine: 269 - 283
SICI:
1090-7807(200108)151:2<269:IBIPFN>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHASE-MODULATED PULSES; ADIABATIC PULSES; COMPOSITE PULSES; SPIN INVERSION; BAND INVERSION; SEQUENCE; WALTZ-16;
Keywords:
two-level system; broadband inversion pulse; population inversion; frequency modulation; adiabatic; high-field NMR; composite pulse;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Shaka, AJ Univ Calif Irvine, Dept Chem, Irvine, CA 92697 USA Univ Calif Irvine Irvine CA USA 92697 hem, Irvine, CA 92697 USA
Citazione:
M.A. Smith et al., "Improved broadband inversion performance for NMR in liquids", J MAGN RES, 151(2), 2001, pp. 269-283

Abstract

New NMR broadband inversion pulses that compensate both for resonance offset and radiofrequency (RF) inhomogeneity are described. The approach described is a straightforward computer optimization of an initial digitized waveform generated from either a constant-amplitude frequency sweep or from an existing composite inversion pulse. Problems with convergence to local minima are alleviated by the way the optimization is carried out. For a given duration and maximum allowable RF field strength B-1 (but not necessarily given RMS power deposition), the resultant broadband inversion pulse (BIP) shows superior inversion compared to inversion pulses obtained from previous methods, including adiabatic inversion pulses. Any existing BIP can be systematically elaborated to build up longer inversion pulses that perform overlarger and larger bandwidths. The resulting pulse need not be adiabatic throughout its duration or across the entire operational bandwidth. (C) 2001 Academic Press.

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Documento generato il 04/04/20 alle ore 07:25:14