spin echo การใช้

• Homonuclear J-resolved spectroscopy uses the spin echo pulse sequence.
• This transverse magnetisation refocuses to form a spin echo at a time " T"
• The spin echo case is referred to as a type of'tilted projection measurement '.
• E ( the spin echo maximum ), phase only encodes spatial location in the Y direction.
• In the spin echo effect, it is physically possible to induce time reversal in an interacting system of spins.
• The spin echo technique is more useful when the spins have dephased more significantly such as in the animation below:
• When protons are diffusing, the sequence of spin echo amplitudes is affected by inhomogeneities in the permanent magnetic field.
• A spin echo experiment can be used to reverse time-invariant dephasing phenomena such as millimeter-scale magnetic inhomogeneities.
• This results in an additional decay of the spin echo amplitudes that depends on the echo spacing 2 \ Delta t.
• Gated subtraction fast spin-echo : An imaging technique that subtracts two fast spin echo sequences acquired at systole and diastole.
• Multi-shot EPI and fast spin echo techniques acquire only part of " k "-space per excitation.
• An extra spin echo step can then optionally be used to decouple the signal, simplifying the spectrum by collapsing multiplets to a single peak.
• In 1972 F . Mezei introduced spin echo neutron scattering, a technique that can be used to study magnons and phonons in single crystals.
• He has also initiated the study of protein domain dynamics by neutron spin echo spectroscopy, providing a way to observe protein nanomachines in motion.
• Mossbauer spectrometry, nuclear magnetic resource spin echo spectroscopy and general magnetic testing media are used to study magnetic materials microscopic structure and general magnetic behavior.
• In steady-state free precession ( SSFP ) and multiple spin echo sequences can be used to accelerate image acquisition or inform on additional parameters.
• Before and after the scattering process, the beam passes through magnetic fields that precess the probe spins in the usual sense of a spin echo experiment.
• The pulse sequence of INEPT, as shown in the diagram, can be read as a combination of spin echo and selective population inversion ( SPI ).
• I don't even understand how spin echo can be consistent with what I thought would be the quantization of the nuclear spin each moment is being measured.
• For molecules that aren't moving, the deviation from ideal relaxation is consistent over time, and the signal can be recovered by performing a spin echo experiment.