Hello, 

I  have (neurite orientation dispersion and density imaging) NODDI data with following b-values:
b=0 (9 averages), b=711 (30 averages) and b=2855 (60), total of 99 gradient vector. 

I generated the 4d Nifti for the diffusion image and when I try to fit it using DKE with following parameters (B=0 threshold=50, weak median filtering, tensor constrained linear weighted fitting, gradient vectors: user defined and I upload the bvec file (and i made sure to remove gradients for b0) it gives me the following error:
index exceed matrix dimensions
Error in dke estimate line 188
Error in dke line 182
I think the problem arises from the user defined gradient vectors, but I have to insert my gradient vectors
Can anyone please inform me on the problem and try to help in figuring the solution out?

Regards, 
Wafaa