The fodfs in bedpostx are by construction as sharp as it gets (sum of delta functions on the sphere).
What you can control is the sensitivity to detect fibre crossings, using the “w” parameter (which adjusts the ARD priors on the volume fractions). However, you need to have a very good reason to move away from the default value of 1 and we do not normally recommend doing that.
> On 10 Aug 2017, at 00:55, JunHyuk Woo <[log in to unmask]> wrote:
> Hello everyone,
> I would like to ask you some question.
> Is there any way that I can modify BEDPOSTX to get sharper ODF?
> Thank you for your attention!