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Monaretto T, Andrade FD, Moraes TB, et al. On resonance phase alternated CWFP sequences for rapid and simultaneous measurement of relaxation times. J Magn Reson. 2015;259:174-8doi: 10.1016/j.jmr.2015.08.013.
Monaretto, T., Andrade, F. D., Moraes, T. B., Souza, A. A., deAzevedo, E. R., & Colnago, L. A. (2015). On resonance phase alternated CWFP sequences for rapid and simultaneous measurement of relaxation times. Journal of magnetic resonance (San Diego, Calif. : 1997), 259174-8. https://doi.org/10.1016/j.jmr.2015.08.013
Monaretto, Tatiana, et al. "On resonance phase alternated CWFP sequences for rapid and simultaneous measurement of relaxation times." Journal of magnetic resonance (San Diego, Calif. : 1997) vol. 259 (2015): 174-8. doi: https://doi.org/10.1016/j.jmr.2015.08.013
Monaretto T, Andrade FD, Moraes TB, Souza AA, deAzevedo ER, Colnago LA. On resonance phase alternated CWFP sequences for rapid and simultaneous measurement of relaxation times. J Magn Reson. 2015 Oct;259:174-8. doi: 10.1016/j.jmr.2015.08.013. Epub 2015 Aug 31. PMID: 26363504.
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J Magn Reson. 2015 Oct;259:174-8. doi: 10.1016/j.jmr.2015.08.013. Epub 2015 Aug 31.

On resonance phase alternated CWFP sequences for rapid and simultaneous measurement of relaxation times.

Journal of magnetic resonance (San Diego, Calif. : 1997)

Tatiana Monaretto, Fabiana Diuk Andrade, Tiago Bueno Moraes, Andre Alves Souza, Eduardo Ribeiro deAzevedo, Luiz Alberto Colnago

Affiliations

  1. Instituto de Química de São Carlos, Universidade de São Paulo, Av. Trabalhador São-carlense, 400, São Carlos, SP 13566-590, Brazil; Embrapa Instrumentação, Rua XV de Novembro, 1452, São Carlos, SP 13560-970, Brazil.
  2. Embrapa Instrumentação, Rua XV de Novembro, 1452, São Carlos, SP 13560-970, Brazil.
  3. Instituto de Física de São Carlos, Universidade de São Paulo, Av. Trabalhador São-carlense, 400, São Carlos, SP 13566-590, Brazil.
  4. Schlumberger Brazil Research and Geoengineering Center, Rua Paulo Emídio Barbosa, 485, Quadra 7B, Rio de Janeiro, RJ 21941-907, Brazil.
  5. Embrapa Instrumentação, Rua XV de Novembro, 1452, São Carlos, SP 13560-970, Brazil. Electronic address: [email protected].

PMID: 26363504 DOI: 10.1016/j.jmr.2015.08.013

Abstract

T1 and T2 relaxation times have been frequently used as probes for physical-chemical properties in several time-domain NMR applications (TD-NMR) such as food, polymers and petroleum industries. T2 measurements are usually achieved using the traditional Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence because it is a fast and robust method. On the other hand, the traditional methods for determining T1, i.e., inversion and saturation recovery, are time-consuming, driving several authors to develop rapid 1D and 2D methods to obtain T1 and T2 or T1/T2 ratio. However, these methods usually require sophisticated processing and/or high signal to noise ratio (SNR). This led us to develop simple methods for rapid and simultaneous determination of T1 and T2 using Continuous Wave Free Precession (CWFP) and Carr-Purcell Continuous Wave Free Precession (CP-CWFP) pulse sequences. Nevertheless, a drawback of these sequences is that they require specific adjustment of the frequency offset or the time interval between pulses (Tp). In this paper we present an alternative form of these sequences, named CWFPx-x, CP-CWFPx-x, where a train of π/2 pulses with phases alternated by π enable performing the experiments on-resonance and independently of Tp, when Tp

Copyright © 2015 Elsevier Inc. All rights reserved.

Keywords: CP-CWFP; CWFP; Phase alternation; SSFP; TD-NMR

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