[Mrtrix-discussion] Re: nan in response function

[Zhuang Song]

Sorry I just realized a simple error in my script in generating the mask
file with FA thresholded at 0.7. Now the results look fine and there is no
nan in the response function any longer.

Zhuang


On Wed, May 1, 2013 at 11:55 AM, Zhuang Song <zhuang.song at gmail.com> wrote:

> Dear Group,
>
> In the output response functions produced by estimate_response, there are
> several cases in my data that have nan in the response functions while
> others look fine. These image were all acquired and processed with the same
> methods. I was wondering what might be the reason to get nan in the
> results. Does it indicate there are some problems in the DWI data? The DTI
> construction all looks fine for all these data.
>
> Some examples of response functions in my data:
>
> 378.369 nan nan nan nan
>
> 374.228 nan nan nan nan
>
> 410.525 nan nan nan nan
>
> 364.583 -32.2504 0.4034 -0.0136654 -0.0424694
>
> 427.235 -48.645 0.795029 0.0733941 -0.0156282
>
> 334.129 -36.3756 0.0756312 0.0734365 -0.0178463
>
> 413.255 -43.6258 0.441787 -0.0159834 0.0150817
>
> 385.935 -39.2011 0.477614 0.0651567 0.00753772
>
> 433.311 nan nan nan nan
>
> 405.377 nan nan nan nan
>
> In order to generate a group mean response function, I do simple averaging
> of each coefficient of those individual without any nan's. Does this sound
> reasonable?
>
> Thanks,
> Zhuang
>
>
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