[Insight-users] itk::DiffusionTensor3D fa map

[Garin, Alba]

Dear Vikash,

Thanks for your quick reply. I think I am getting the correct FA values inside the brain, but I will check them just in case. I have already mask the image, so the image I visualize is the correct one, but I was just asking in the mailing list just in case there was a specific reason.

Regards,
Alba

Alba Garin Muga

Computer Science PhD Student

Applied Mechanics Department

Paseo Manuel Lardizabal, 15
20018 Donostia-San Sebastian. Spain
Tel.  +34 943 212 800  (Ext. 2111)
Fax: +34 943 213 076
Web: www.ceit.es<http://www.ceit.es/>


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From: Vikash Gupta [mailto:vikash.gupta at inria.fr]
Sent: jueves, 28 de febrero de 2013 10:41
To: Garin, Alba
Cc: insight-users at itk.org
Subject: Re: [Insight-users] itk::DiffusionTensor3D fa map

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
________________________________
From: "Alba Garin" <agarin at ceit.es<mailto:agarin at ceit.es>>
To: insight-users at itk.org<mailto: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

Paseo Manuel Lardizabal, 15
20018 Donostia-San Sebastian. Spain
Tel.  +34 943 212 800  (Ext. 2111)
Fax: +34 943 213 076
Web: www.ceit.es<http://www.ceit.es/>


[cid:image001.gif at 01CE15AA.EEBC3B20]

[cid:image002.jpg at 01CE15AA.EEBC3B20]

Antes de imprimir este e-mail piense bien si es necesario hacerlo. El medioambiente es cosa de todos.
Before printing this e-mail ask yourself if you really need a hard copy. We are all responsible for the environment.
E-mail hau inprimatu baino lehen egiaztatu inprimatzeko beharra. Ingurumena guztion ardura da





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