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Is TrueFISP a gradient-echo or a spin-echo sequence?

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons84187

Scheffler,  K
Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Zitation

Scheffler, K. (2003). Is TrueFISP a gradient-echo or a spin-echo sequence? Magnetic Resonance in Medicine, 49(2), 395-397. doi:10.1002/mrm.10351.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0013-DCF4-F
Zusammenfassung
It is commonly accepted that TrueFISP (balanced FFE, FIESTA) belongs to the class of gradient-echo (GRE) sequences. GRE sequences are sensitive to dephasing effects of the transverse magnetization between the excitation pulse and echo acquisition, and phase coherence is only established directly after and before excitation pulses. However, an analysis of the phase evolution of transverse magnetization in a TrueFISP experiment shows very close similarities to the echo formation of a spin-echo (SE) experiment. If dephasing between excitation pulses is below ±π, TrueFISP exhibits a nearly complete refocusing of transverse magnetization at TE = TR/2. Only signals acquired before and after TR/2 show an additional Tmath image sensitivity.