If you are using ASL, you do not want to use Slice timing. You must compute the CBF maps and keep the slice timing intact.

Removing the time delay between slices will lead to the wrong CBF values as the CBF equations have the time delay in the equation.

Best Regards, Donald McLaren
=================
D.G. McLaren, Ph.D.
Research Fellow, Department of Neurology, Massachusetts General Hospital and
Harvard Medical School
Postdoctoral Research Fellow, GRECC, Bedford VA
Website: http://www.martinos.org/~mclaren
Office: (773) 406-2464
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On Fri, Mar 29, 2013 at 1:08 PM, Douglas N Greve <greve@nmr.mgh.harvard.edu> wrote:
what are you using to do STC? I think by default FSL will move it to the
middle slice, but there is probably a way to make take into account the
fact that the slices are not uniform over the TR. You should contact the
list of the software you are using to get a definative answer.
doug


On 03/29/2013 11:37 AM, Meryem Ayse Yucel wrote:
> Hi,
>
> I am running a pASL sequence with a TR = 3 sec and TI2 = 1.8. I am
> wondering when I do slice time correction does that move all slices to the
> mid of TR that is 1.5 s prior in time or, it moves them to the timing of
> the mid slice, which would be the mid of image acquisition aorund 0.6 sec
> prior in time with respect to the end of TR.
>
> Thank you,
>
> Meryem
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>

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