Dear Verena,
You can use the tool "distancemap" to create an image where each voxel contains the distance to a mask. It would then be possible to threshold this appropriately with fslmaths to achieve what you want.
All the best,
Mark
On 10 Jan 2013, at 22:33, Verena Rozanski <[log in to unmask]> wrote:
> Dear FSL-experts,
>
> I was wondering if there is a tool for measring 3D-distance in FSL. I don`t mean to calculate the distance between two given points, but I intend to draw ROIs equidistant to a given point and wonder if that can be realised in FSL.
>
> Thank you,
> best regards,
>
> Verena
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