Hi
I am not sure what you mean by "number of Monte Carlo iterations”, i.e. which option you are referring to.
The number of streamlines leaving an roi is equal to (NumberOfSamples X NumberOfRoiVoxels)
where NumberOfSamples is defined with the —nsamples option in the command line.
Note that if you use waypoints/exclusion masks there may be streamlines that are rejected by the sampling. The number of remaining streamlines can be found in the output file called “waytotal”.
Cheers
Saad
> On 4 Mar 2019, at 20:14, SA <[log in to unmask]> wrote:
>
> Hi ,
>
> I was wondering how I can calculate the maximum number of streams (tracks) leaving an ROI after using probabilistic tractography.
>
> The number of seeds per voxel per Monte Carlo iteration I chose is 5
> And the number of Monte Carlo iterations 1000
> The number of voxels in ROI1 are 120
>
> So what I've been doing to calculate the maximum is:
> (Number of voxels from an ROI) x (number of monte carlo iterations) x (number of seeds per voxel)
> 120 x 1000 x 5
>
> Is this correct? Or is there a more accurate approach to get this value?
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