[Mristudio-users] Optic radiations

[susumu]

Hi Christian,

 

As Jun Yi said, you can get statistics at each coronal section using the
"profile" button. This may be a good approach to study the optic radiation
in the occipital lobe, although it should include not only the OR but also
other fibers such as IFO and ILF as you can see from your reconstruction
results. By adding more ROI in the LGN, the specificity to the OR may
increase but you may loose a lot of the OR (sensitivity) as an expense of
unknown increase in the specificity. The tracts in the green area is a
mixture of many tracts anyway and extract of the pure OR may be impossible
by DTI.

 

The CUT operation is always a two-ROI method, which can't be combined with
third ROI. 

 

Susumu

 

  _____  

From: mristudio-users-bounces at mristudio.org
[mailto:mristudio-users-bounces at mristudio.org] On Behalf Of Jun Yi Wang
Sent: Thursday, November 06, 2008 9:40 AM
To: c.bieck at t-online.de; mristudio-users at mristudio.org
Subject: Re: [Mristudio-users] Optic radiations

 

Hi Christian,

 

After you click on the Statistics button, you can select a parameter and
click on the Statistics Profile button to open up the list of values at each
slice.  For you case, you can look at the coronal section and select the
range of slices you desire.  You can copy/paste your selection into a
spreadsheet.

 

Jun Yi

 

  _____  

From: Christian Bieck <c.bieck at T-Online.de>
To: mristudio-users at mristudio.org
Sent: Thursday, November 6, 2008 3:13:00 AM
Subject: [Mristudio-users] Optic radiations

This message seems to have bounced due to the attached picture exceeding the
size limit, so I uploaded the picture instead.


Hello, 


Thank you very much for the very fast replies. 
I tried using the CUT operations in the Fiber Tab after fiber tracking, but
could not achieve any satisfactory results as the CUT operation ended in
adding fibers that were not previously there. This may be due to, as Jun Yi
Wang wrote, the CUT operation not being able to be combined with other
operations (AND, OR, NOT) of which I made heavy use during extracting the
optic radiation. 
Basing the application of the AND, OR and NOT operations on the anatomy of
the optic radiation as detailed in neuroanatomic publications, I ended up
with something along the lines of what you see in the attached picture
(http://i202.photobucket.com/albums/aa215/Senalsun/Opticradiationscut.jpg).
While there is still *a lot* of fine-tuning to be done, I would like to know
if there is a way of getting rid of the part circled in red so that I may
only get the FA statistics of the optic radiation circled in green, without
any of these posterior fibers getting cut out in the process.

As an alternative way, is it possible to extract the saved Fiber ROIs and FA
values as a spreadsheet so I could copy it into Excel or SPSS? My supervisor
told me it would be a good idea, if all else fails, to put the Fiber ROI
data into a spreadsheet, then only look at the coordinates beyond a certain
x, y or z value signifying the fiber tracts in the visual cortex and then
look these positions up in the FA values map. 

Again, thank you very much for your time and help. 


Sincerely, 
Christian Bieck




 

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