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TOPIC: VOI, FA, length fiber, ADC values

VOI, FA, length fiber, ADC values 9 years 1 month ago #218

  • zebulon
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Hello everyone,

I have computed fiber with FA image and i have a VOI.
I want to extract FA, length fiber and ADC values to this VOI.
How can i get this ?

Thank you
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Re: VOI, FA, length fiber, ADC values 9 years 1 month ago #220

  • ocommowick
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Hi,

I am not sure I understood well what you wanted to do exactly so let me answer with what medinria can do, hoping that it fits your needs.

If you have run tractography using the medinria pipeline, you end up with a set of tracts on the full brain. You can then use the fiber bundling toolbox to filter your fibers (e.g. select only those that are going through your region of interest) and create a bundle from it. Once you have done this, medinria is able to give you the average and standard deviations of typical scalar values extracted from the tensors. These values will be over the selected tracts though, not over the region of interest you used for filtering.

If you don't know the tractography pipeline in medinria we have a (quite long) video on it on youtube : . It explains the whole process from loading your data to filtering it using the fiber bundling toolbox.

Hope this helps
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Re: VOI, FA, length fiber, ADC values 9 years 1 week ago #233

  • zebulon
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Hello,

Thank for you answer.

In fact i wanted filter fibers not with the fiber bundling toolbox but with a VOI imported in medinria. And with your video i understand now how do that.

But I have an other question :P :

What is the unit of the FA, ADC and the length of fibers ?

Thank you very much !
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Re: VOI, FA, length fiber, ADC values 9 years 4 days ago #234

  • ocommowick
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Happy to see these videos helped you. As for the units, FA has no unit it varies in between 0 and 1: 1 is pure anisotropy, 0 is isotropic. ADC is a bit more tricky as tensors in medinria are not scaled by the b-value. The number a given to you is therefore (a / b) mm^2 / s . Finally fiber length is in millimeters
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Re: VOI, FA, length fiber, ADC values 9 years 4 days ago #235

  • zebulon
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Thank you !

It remains for me to work ! :P

Bye
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