if your masks have different sizes, then of course the waytotals will be different, even if the proportions of streamlines reaching the targets are the same.
saad.
On 14 Dec 2010, at 12:11, Monica Giraldo wrote:
> Hi, thank you for your answers. Well I understand. But the problem is that the waytotal numbers represent only the tracks that go from 7 and pass through 8. And the ones that go from 8 and pass through 8. If a track goes from 7 and does not pass through 8 it wont be counted. Because as FSL sais, when you select multiple masks it will only count the number of tracks that go from each mask and pass through ANY OF THE OTHER SEED MASKS. And I have only two seed masks... In the example Saad has given the problem is that even when you have two tracks from B to A, only one track arrives to A. So, only one track is going from A to B, and one from B to A.
>
> could it have something to do with the size of the maks? the strange thing is that it always give me a higher value for the biggest mask. I tryed to modify Saad's drawing in order to adapt it to a situation were B be bigger than A... and i did the followin... is it right or am I msitaking?
>
> (see Untitled.jgp file)
> <Untitled.jpg>
--
Saad Jbabdi
University of Oxford, FMRIB Centre
JR Hospital, Headington, OX3 9DU, UK
(+44)1865-222466 (fax 717)
www.fmrib.ox.ac.uk/~saad
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