Pulsed gradient spin echo sequence

Fig. 8. The Stejskal-Tanner pulsed gradient spin-echo sequence.

Figure 6 (A) Pulsed gradient spin echo sequence used to encode spin magnetization phase for molecular translational motion. (B) Velocity and diffusion maps for a water molecule flowing through a 2 mm diameter capillary. The images are shown as stackplots. The velocity profile is Poiseuille while the diffusion map is uniform. Courtesy of RW Mair, MM Britton and the author.

A(g) is the signal intensity observed with an applied gradient g, A(0) is the intensity in the absence of an applied gradient, y is the nuclear gyromagnetic ratio, and (5 and A are time intervals of the pulsed field gradient spin—echo sequence. 

Fig. 18. Pulsed-gradient spin-echo (PGSE) pulse sequence...

Figure 5.1 Pulsed-gradient spin-echo NMR sequence for the measurement of self-diffusion coefficient.

Fig. 1. Gradient of rf sequence for pulsed gradient spin-echo NMR using narrow gradient pulses of amplitude g, duration 8, and separation A.

Figure 9.19. Clean selective excitation with the double pulsed field gradient spin-echo sequence using a 40 ms Gaussian 180° pulse and gradients of 0.07 0.07 0.03 0.03 Tm- .

Figure 3 The pulsed gradient spin-echo pulse sequence. 90" and 180 are the two rf pulses. Two field gradient pulses of magnitude g, duration S, and separation A are applied before and after the 180 refocusing pulse. The second half of the spin echo is Fourier transformed, and the relative intensities of the resolved absorption peaks are measured.

Figure 7 Pulsed-gradient spin-echo (PGSE) electrophoretic NMR sequence. This ENMR pulse sequence is used to detect electrophoretic mobility during the gated electric field E, which is applied fora time duration 3 equal to the spacing between a pair of magnetic field gradient pulses. Reprinted with permission from Ref. [37], Copyright [2014], AlP Publishing LLC.

Fig. 1.34. Basic Stejskal-Tanner pulsed gradient spin-echo (PGSE) pulse sequence n/2-g 8)-n-g(<5)-echo used for displacement spectroscopy. The echo time TE is 2r and the displacement time is A. After Hills [718]. Reprinted from B. Hills, Magnetic Resonance Imaging in Food Science, John Wiley Sons, Inc., New York, NY. Copyright (1998, John Wiley Sons, Inc.). This material is used by permission of John Wiley Sons, Inc.

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