[Mristudio-users] Question about map file operations

[Deepa Krishnaswamy]

Hi,
So I combined the ROIs as mentioned above (did this in MATLAB as I found it
easier); these were for the left frontal and left temporal lobes (used to
extract the SLF-t). Only a few fibers were extracted, and I am unsure as to
why there are so few. I'm using the processed data (Subject_LDDMM.d) for
tractography.
Also I noticed in the paper (also mentioned above), there are ROIs listed
for major tracts, such as CST, SLF, etc. How can this one ROI be used to
extract a tract? I noticed the results using the one ROI for the CST, and
the actual list of ROIs are very different.
Thanks,

Deepa


On Mon, Apr 15, 2013 at 7:40 PM, susumu mori <susumu at mri.jhu.edu> wrote:

> Good question.
> There may be a clever way to do it, but I would combine the ROI #1-3 and
> ROI#4-6 first and create two ROI masking files.
>
>
> On Mon, Apr 15, 2013 at 4:46 PM, Deepa Krishnaswamy <
> deepa.krishnaswamy1 at gmail.com> wrote:
>
>> Hi,
>> Thanks Durai, you are absolutely correct. It seems that using two ROIs
>> (first as AND, second as OR) is exactly the same as using the second ROI as
>> an OR.
>> Another question, if I am trying to implement something like (ROI1 OR
>> ROI2 OR ROI3) AND (ROI4 OR ROI5 OR ROI6), how would this actually be done
>> using the map file? Of course I could do this by manually combining ROI1, 2
>> and 3 together, as well as 4,5 and 6, but I don't want to do that.
>> Thanks,
>>
>> Deepa
>>
>>
>> On Mon, Apr 15, 2013 at 2:55 PM, Durai Arasan <durai23 at gmail.com> wrote:
>>
>>>
>>>> If say I happen to put the first operation as AND, and the second
>>>> operation as OR, I still obtain a fiber bundle. I don't understand what
>>>> this actually means logically.
>>>>
>>>
>>> If the fiber bundle obtained is the same as that obtained if you just
>>> draw one OR roi, then it means the result of the first AND operation was a
>>> null roi. I think the logical ROI operations in DTI studio take a "null
>>> roi" as the default argument when a roi is not provided explicitly.
>>>
>>> _______________________________________________
>>> mristudio-users mailing list
>>> mristudio-users at mristudio.org
>>> http://lists.mristudio.org/mailman/listinfo/
>>> Unsubscribe, send a blank email to:
>>> mristudio-users-unsubscribe at mristudio.org
>>>
>>>
>>
>> _______________________________________________
>> mristudio-users mailing list
>> mristudio-users at mristudio.org
>> http://lists.mristudio.org/mailman/listinfo/
>> Unsubscribe, send a blank email to:
>> mristudio-users-unsubscribe at mristudio.org
>>
>>
>
> _______________________________________________
> mristudio-users mailing list
> mristudio-users at mristudio.org
> http://lists.mristudio.org/mailman/listinfo/
> Unsubscribe, send a blank email to:
> mristudio-users-unsubscribe at mristudio.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.mristudio.org/pipermail/mristudio-users/attachments/20130418/a39426f1/attachment.html