[Mristudio-users] Fiber branching

[Seongjin]

I appreciate your kind explanation.
-SC

On Wed, Sep 23, 2009 at 7:28 AM, susumu mori <susumu at mri.jhu.edu> wrote:

> FACT algorithm never branches. From one seed, only one unbranched line
> propagates. However, there is a very important thing you need to know.
>
> If you draw an ROI with 10 pixels and start FACT from these 10 pixels, you
> get 10 unbranched lines passing through the ROI.
>
> Alternatively, you can do a brute-force approach, in which you start FACT
> from every single pixels inside the brain (above FA threshold). Maybe you
> can find 10s of thousands of seed pixels and the equal number of propagated
> lines in this way. Then you can retain all tracking results that go through
> the 10-pixel ROI.
>
> In this case, you likely to find more than 100 lines going into the ROI.
> This is because many FACT reconstructed lines merge. So, even if FACT can
> not branch, it can merge if you are using a brute-force method. The' speed
> and simplicity of FACT algorithm allows us to use this "reverse" approach
> within a short time (and this is what DtiStudio is using).
>
> This aspect of FACT is often overlooked when it is compared to other more
> sophisticated (but complex) methods.
>
> On Wed, Sep 23, 2009 at 12:06 AM, [Seongjin] <choisj70 at gmail.com> wrote:
>
>> Dear all,
>>
>> This might be a very naive question. But I need to know. Do the fibers
>> tracked by FACT algorithm in DTIStudio contain branched fibers?
>>
>> As an example, let's consider some fibers passing through an ROI drawn in
>> the mid-sagittal plane.
>> In this case, the number of fiber passing through the ROI and the number
>> of all fibers tracked are the same?
>> If they are the same, it would be simply fiber panning. If the number of
>> fibers tracked is more than the fibers passing through the ROI, then, it
>> might be the case of branched fibers.
>>
>> Is there any opinion on this?
>>
>> Thanks.
>>
>> -SC
>>
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>
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