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Hi, Stam and Matt
Thank you very much for the information. I have two related questions and would appreciate your information. Does the model assume the two crossing fibers have the same diffusivity? If I want to simulate two crossing fibers, am I right to simulate diffusion data for two fibers independently and then combine the diffusion-weighted MRI data together based on their f values?

Thanks again.

Leon

From: Stamatios Sotiropoulos <[log in to unmask]>
To: [log in to unmask]
Sent: Wednesday, June 6, 2012 2:06 AM
Subject: Re: [FSL] where to find diffusivity in the ball-and-stick model?

Hi Leon

In the latest FSL versions, the mean values of the diffusivity posterior distribution are saved in the output folder. There should be a mean_dsamples file. If you cannot find it, please update to the latest FSL version.

Cheers
Stam




On 6 Jun 2012, at 05:28, Matt Glasser wrote:

They are in the bedpostx slice folders, but are not merged in the final output, and are deleted when the slice folders are deleted.  
 
Peace,
 
Matt.
 
From: FSL - FMRIB's Software Library [mailto:[log in to unmask]] On Behalf Of Leon
Sent: Tuesday, June 05, 2012 11:01 PM
To: [log in to unmask]
Subject: [FSL] where to find diffusivity in the ball-and-stick model?
 
Hi, FSL experts
I want to simulate diffusion MRI signals based on the estimated parameters for the ball-and-stick model in the bedpostX folder. But I cannot find the diffusivity values as mentioned in the paper. Could someone tell where I can find this value? 
 
Thanks in advance!
Leon