Dear Josh,
for a large majority of cases the readout time doesn’t matter at all. If you get it right it means that the fieldmap is correctly scaled in units of Hz. That is important in a few cases, such as if you want to use the estimated field in a different software (i.e. not applytopup or eddy) that expects a field in Hz. But if you use topup to estimate a field that you then pass to eddy or applytopup, using the same acqparams.txt file, it will not have any impact on the corrected images whatsoever.
Jesper
> On 27 Feb 2019, at 20:20, Josh Robinson <[log in to unmask]> wrote:
>
> Hello all,
>
> We have been using topup to correct susceptibility artifact in our DTI. We recently discovered slight error in the readout time of our acquisition parameters file for the data (0.029 vs 0.027). This seems small enough to be negligible, but we would like to confirm whether or not this difference would have any noticeable effect on our data?
>
> Thank you for your time,
>
> Josh
>
> ########################################################################
>
> To unsubscribe from the FSL list, click the following link:
> https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=FSL&A=1
########################################################################
To unsubscribe from the FSL list, click the following link:
https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=FSL&A=1
|