[Insight-users] itk::DiffusionTensor3D fa map

[Vikash Gupta]

Hi 
No it is highly unlikely that the FA in the air will be 0.6. o.6 is a high FA and should mostly correspond to WM. I will suggest to mask the image, because the background is generally noise and the tensors from Noise (air) does not hold nay meaning. 
Also, may be check manually for a voxel or two inside the brain if you are getting correct FA. 

Vikash 
----- Original Message -----

> From: "Alba Garin" <agarin at ceit.es>
> To: insight-users at itk.org
> Sent: Thursday, February 28, 2013 10:15:43 AM
> Subject: [Insight-users] itk::DiffusionTensor3D fa map

> Dear all,

> I am computing different DTI maps from an Image with
> itk::DiffusionTensor3D pixel type. If I get MD, Trace, First
> Eigenvalue and other maps, I get a correct map, but If I compute the
> FA map, I get high values (0.6) in the air part of the image (around
> the brain). I mean, even the brain can be distinguished from the
> air, there are values in the air. Is this normal? Have this happened
> to anyone before?

> Thanks in advance.
> Regards,
> Alba

> Alba Garin Muga

> Computer Science PhD Student

> Applied Mechanics Department

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