Hi? recently I try to use the bloch equation to simulate the magnetization M's variation, i used the perfect 90-degree excitation ,and the magnetization became [1 0 0] from [0 0 1] immediately . But i want to know if the excitation's width is not zero, then what's the relationship between the pulse width and the echo time. asked Apr 18 '13 at 18:51 da hsu |