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Registro Completo |
Biblioteca(s): |
Embrapa Instrumentação. |
Data corrente: |
14/04/2020 |
Data da última atualização: |
11/12/2024 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
MONARETTO, T.; MONTRAZI, E. T.; MORAES, T. B.; SOUZA, A. A.; RONDEAU-MOURO, C.; COLNAGO, L. A. |
Afiliação: |
LUIZ ALBERTO COLNAGO, CNPDIA. |
Título: |
Using T1 as a direct detection dimension in two-dimensional time-domain NMR experiments using CWFP regime. |
Ano de publicação: |
2020 |
Fonte/Imprenta: |
Journal of Magnetic Resonance, n. 311, a. 106666, 2020. |
ISSN: |
1090-7877 |
DOI: |
10.1016/j.jmr.2019.106666 |
Idioma: |
Inglês |
Conteúdo: |
The transverse relaxation time (T 2), measured with Carr-Purcell-Meiboom-Gill (CPMG) sequence, has been widely used to obtain the direct dimension data in two-dimension time domain NMR (2D TDNMR). In this paper we are demonstrating that Continuous Wave Free Precession sequence, with low flip angle (CWFP-T1 ), can be an alternative to CPMG as direct detection dimension. CWFP-T 1 is a fast single shot sequence, like CPMG, and yields an exponential signal governed predominantly by the longitudinal (T1 ) relaxation time. To obtain the correlations between T1 and T2 (T 1-T 2 maps) we are proposing the use of CPMG-CWFP-T 1 pulse sequence. In this sequence CPMG encodes T 2 information (indirect dimension) that modulates the CWFP-T 1 (direct dimension) signal amplitudes. CPMG-CWFP-T 1 experiments were compared with classical 2D sequences such as Saturation-Recovery-CPMG (SR-CPMG) and InversionRecovery-CPMG (IR-CPMG) sequence and yields similar results in phantom sample. The experimental time for the 2D sequences, using single scan, shows that SR-CPMG #20; CPMG-CWFP-T 1 < IR-CPMG.Experimental and simulated results demonstrated that 2D-CPMG-CWFP-T 1 maps have higher resolution in T1 dimension than the techniques that uses CPMG as direct dimension. CPMG-CWFP-T1 sequence was also applied to study beef samples, and 2D maps showed higher resolution in the two fat signals than the classical IR-CPMG method. |
Palavras-Chave: |
2 D TD NMR pulse sequence; 2D Laplace transform; CPMG CWFP T1; T1 T2 maps. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02188naa a2200253 a 4500 001 2121653 005 2024-12-11 008 2020 bl uuuu u00u1 u #d 022 $a1090-7877 024 7 $a10.1016/j.jmr.2019.106666$2DOI 100 1 $aMONARETTO, T. 245 $aUsing T1 as a direct detection dimension in two-dimensional time-domain NMR experiments using CWFP regime.$h[electronic resource] 260 $c2020 520 $aThe transverse relaxation time (T 2), measured with Carr-Purcell-Meiboom-Gill (CPMG) sequence, has been widely used to obtain the direct dimension data in two-dimension time domain NMR (2D TDNMR). In this paper we are demonstrating that Continuous Wave Free Precession sequence, with low flip angle (CWFP-T1 ), can be an alternative to CPMG as direct detection dimension. CWFP-T 1 is a fast single shot sequence, like CPMG, and yields an exponential signal governed predominantly by the longitudinal (T1 ) relaxation time. To obtain the correlations between T1 and T2 (T 1-T 2 maps) we are proposing the use of CPMG-CWFP-T 1 pulse sequence. In this sequence CPMG encodes T 2 information (indirect dimension) that modulates the CWFP-T 1 (direct dimension) signal amplitudes. CPMG-CWFP-T 1 experiments were compared with classical 2D sequences such as Saturation-Recovery-CPMG (SR-CPMG) and InversionRecovery-CPMG (IR-CPMG) sequence and yields similar results in phantom sample. The experimental time for the 2D sequences, using single scan, shows that SR-CPMG #20; CPMG-CWFP-T 1 < IR-CPMG.Experimental and simulated results demonstrated that 2D-CPMG-CWFP-T 1 maps have higher resolution in T1 dimension than the techniques that uses CPMG as direct dimension. CPMG-CWFP-T1 sequence was also applied to study beef samples, and 2D maps showed higher resolution in the two fat signals than the classical IR-CPMG method. 653 $a2 D TD NMR pulse sequence 653 $a2D Laplace transform 653 $aCPMG CWFP T1 653 $aT1 T2 maps 700 1 $aMONTRAZI, E. T. 700 1 $aMORAES, T. B. 700 1 $aSOUZA, A. A. 700 1 $aRONDEAU-MOURO, C. 700 1 $aCOLNAGO, L. A. 773 $tJournal of Magnetic Resonance$gn. 311, a. 106666, 2020.
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