Echo planar Imaging- Echo Train Length

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Oscar307307
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Re: Echo planar Imaging- Echo Train Length

Post by Oscar307307 » Wed Nov 01, 2017 11:42 am

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?

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