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Titolo:
OPTIMIZATION OF THE ULTRAFAST LOOK-LOCKER ECHO-PLANAR IMAGING T-1 MAPPING SEQUENCE
Autore:
FREEMAN AJ; GOWLAND PA; MANSFIELD P;
Indirizzi:
UNIV NOTTINGHAM,DEPT PHYS,MAGNET RESONANCE CTR,UNIV PK NOTTINGHAM NG72RD ENGLAND
Titolo Testata:
Magnetic resonance imaging
fascicolo: 7, volume: 16, anno: 1998,
pagine: 765 - 772
SICI:
0730-725X(1998)16:7<765:OOTULE>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
GADOLINIUM UPTAKE; ONE-SHOT; T1;
Keywords:
FAST T-1 MAPPING; LL-EPI; CONTRAST AGENT DYNAMICS; OPTIMIZATION; ENHANCEMENT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
A.J. Freeman et al., "OPTIMIZATION OF THE ULTRAFAST LOOK-LOCKER ECHO-PLANAR IMAGING T-1 MAPPING SEQUENCE", Magnetic resonance imaging, 16(7), 1998, pp. 765-772

Abstract

The Look-Locker echo-planar imaging (LL-EPI) sequence has been numerically optimized in terms of the signal-to-noise ratio in the measured value of T-1, for both single-shot (repetition time (T-R) = proportional to), and dynamically repeated T-1 measurements, The sequence is optimized for the normal biologic range of T-1 (0.2 s to 2.0 s) and for arange of sequence parameters found on most magnetic resonance (MR) scanners. Both linearly and geometrically spaced magnetization sample pulse intervals were considered, Far single-shot measurements, the sequence with 24 linearly spaced sample pulses, an inversion time of 0.01 a, an inter-sample pulse delay of 0.10 s, and a sample radiofrequency (RF) pulse flip angle of 25 degrees was found to be optimum, When the number of sample pulses was limited due to hardware limitations, different pulse sequence parameters were indicated. The optimization procedures used are appropriate for any single-shot T-1 mapping sequence variant and for any rapid T-1 mapping application. The use of an optimizedLook-Locker echo-planar imaging sequence is demonstrated by an example of dynamic contrast-enhanced scanning in the brain using fast T-1 mapping. (C) 1998 Elsevier Science Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 17:58:45