Spin Echoes in the Regime of Weak Dephasing

It is shown that it is possible to form spin echoes after a single excitation pulse, where the time between the end of the pulse and the echo is longer than the length of the pulse itself. This stands in contrast to Hahn's spin echo theory, where the length of the pulse sequence is at most equal to the time between the end of the composite pulse and the echo. A representative pulse is implemented into a FLASH sequence and proof-of-concept images show a reduction of off-resonance induced signal attenuation.

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