NMR Excitation, Dephasing and Spin Echoes
NMR Excitation, Dephasing and Spin Echoes
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NMR Excitation, Dephasing and Spin Echoes
This short animation shows the process of NMR excitation in the laboratory and the rotating frame, as well as the dephasing that occurs from field inhomogeneity and the formation of the Hahn spin echo. Please credit (c)2010 Mark Cohen (mscohen@ucla.edu) during re-use.
From:markcat3t
Views:8653
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[U. of Ottawa NMR Facility Blog] Gradient Spin Echoes for Selective Excitation
Gradient Spin Echoes for Selective Excitation
Shaped excitation pulses can replace the non-selective hard pulses typically used in a one-pulse measurement to achieve selective excitation. Another method of achieving selective excitation is the gradient spin echo using a selective 180° pulse. This technique is demonstrated in the figure below. http://4.bp.blogspot.com/_5wBTR2kKTqA/S_UxeG5oXdI/AAAAAAAAAzc/BHWef-Tse7s/s400/grad_spin_echo.jpgA non-selective hard 90°x pulse is first given followed by a pair of identical pulsed field gradients sandwiching a soft selective 180° pulse about the y...
Introductory NMR & MRI: Video 07: Measuring T1 and T2 Relaxation
Introductory NMR & MRI: Video 07: Measuring T1 and T2 Relaxation
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Introductory NMR & MRI: Video 07: Measuring T1 and T2 Relaxation
Paul Callaghan gives an introduction to NMR and MRI. This is the 7th video of the series and covers the topics of "Measuring T1 and T2". 10 episode series produced by Magritek Ltd.
From: magritek
Views: 8424
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