From the above questions,
The (effective) echo time TE for 64 square matrix if you start the ETL immediately after the excitation?
is
63/2=31.5
What would be the TE for the 128 square matrix?
127/2=63.5
How much would the signal have dropped at the echo time TE for the 128 square matrix compared to the 64 square matrix? Use the equation:
Mxy(TE)=Mo x exp^(TE/T2*)
I am assuming T2* is the same for both (128 and the 64 square matrix), so if i randomly assign T2*=1000
so
for the 64 square matrix is
1 x e^(31.5/1000)=0.968
for the 128 square matrix is
1 x e^(63.5/1000)=0.938
not sure if i am on the right track?
Echo planar Imaging Echo Train Length

 Out of phase
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