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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
14/04/2020 |
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Data da última atualização: |
11/12/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
MONARETTO, T.; MONTRAZI, E. T.; MORAES, T. B.; SOUZA, A. A.; RONDEAU-MOURO, C.; COLNAGO, L. A. |
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Afiliação: |
LUIZ ALBERTO COLNAGO, CNPDIA. |
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Título: |
Using T1 as a direct detection dimension in two-dimensional time-domain NMR experiments using CWFP regime. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
Journal of Magnetic Resonance, n. 311, a. 106666, 2020. |
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ISSN: |
1090-7877 |
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DOI: |
10.1016/j.jmr.2019.106666 |
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Idioma: |
Inglês |
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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. |
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Palavras-Chave: |
2 D TD NMR pulse sequence; 2D Laplace transform; CPMG CWFP T1; T1 T2 maps. |
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Categoria do assunto: |
-- |
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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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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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