[Mristudio-users] WMPM

[susumu mori]

The best way is to download the latest RoiEditor.
Our atlas is evolving and now we have version numbers.

On Wed, Mar 6, 2013 at 9:59 PM, Raag Airan <rairan1 at jhmi.edu> wrote:

> Hello all,
>
> Where could I find an up to date listing of the which regions correspond
> to each ROI of the atlases - specifically with regard to the Brain
> Parcellation Maps?
>
> Thanks,
> Raag
>
>
> On Wed, Mar 6, 2013 at 9:56 PM, Susumu Mori <susumu at mri.jhu.edu> wrote:
>
>>  There are several types of WMPM. Actually our newer version of
>> parcellation maps include gray matter structures too.
>> So, we are now calling it Brain Parcellation Maps (BPM).
>>
>>  There are two type of parcellation maps; population-averaged and
>> single-subject.
>>
>>  ICBM-DTI-81 atlas is a population-averaged atlas, which has WMPM.
>> Because it is a population map, it is not a real brain. After averaging 81
>> subjects, many structures with high anatomical variability smeared out and
>> not definable anymore. For example, the fine white matter branches into the
>> cortex disappear. Therefore, we can define only the core of the white
>> matter. The WMPM contains structural definitions of only these core WM
>> regions.
>>
>>  In the averaged FA/color maps, you can clearly see core WM structures
>> like the internal capsule. We manually defined these structures. As you
>> approach to the cortex, we find pixels which are 100% WM in all 81 subject
>> as well as pixels which are only 50% WM (WM in 40 subjects and other 40
>> subjects are the cortex). We can threshold the population averaged map at
>> 90, 80, 70, and 60%. As the % goes up, the defined WM shrinks. If you
>> superimpose one of the WM structures with 90% threshold on your subjects
>> (of course, after normalization), it is highly likely that this ROI defines
>> almost pure WM with a small contamination of the cortex.
>>
>>  Does it make sense?
>>
>>
>> On Wed, Mar 6, 2013 at 10:59 AM, Shaimaa Abdelsattar <
>> shaimaa96 at hotmail.com> wrote:
>>
>>> Hi,
>>> Could you please tell me the difference between the different types of
>>> WMPMs. I found what is called WMPM 80 % or etc.....
>>>
>>> Thanks
>>>
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>>
>>
>
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