[Mristudio-users] Question about map file operations

[susumu mori]

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.
>>
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