[Mristudio-users] WMPM

[Raag Airan]

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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