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Forum Diffusion Toolkit Usage Distance-Dependent FA Values

Distance-Dependent FA Values
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UserPost

8:27 am
July 19, 2011


awpmaxwell

Member

posts 3
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Good morning,

 

Is there a way to analyze FA values at specific points along a given fiber track? For example, if I set a region of interest and wanted to know mean FA values both within the ROI and at 1 cm along fiber tracks associated with the ROI, is there a way I could go about acquiring that information?

 

Best,

 

Aaron

11:36 am
July 19, 2011


cibuthomas

Member

posts 16
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Hi aaron

To get the mean FA within an ROI, you could draw the ROI on your FA voume with FSL view or some other tool use it as a mask and and read out the values from the ROI, and then compute the mean.

FA values 1 cm along fiber tracks associated with the ROI: This is a lot more tricky. You could place two ROIs, your actual ROI and an ROI 1 cm away. Use the logical AND and get tracts that are running between the two ROIs. Then if you load the FA volume in Trackvis it will show the mean FA between the 2 ROIs. But this won't work so well if your ROI is in a fasciculus because the tract is likely to extend beyond your two ROIs.

Alternatively you could create a cylinderical mask with FSL and repeat the steps described above.

Hope this helps

Cibu
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