Hi Donna,
That's exactly what I did (although, there are some details in your
example that I didn't understand well, see below). But, instead of keep
going forth and back selecting nodes and subtracting their coordinates
values (I had to do it quite often), I was wondering if there was not an
utility that would automatically highlight all the nodes that are at a
given distance from my reference point. I am not saying that it is a
necessary utility, but, if it was already implemented, I could benefit
from it...
Thanks,
Mateus
For example, there's a pretty big x and z offset between this
occipital pole (first) and candidate most-posterior calcarine border
point:
In this example, I though that the biggest offset was for Y (dX:
15-28=-13; dY: -110 --78=32; dZ: -22 --6=-16). That's why you first
chose to adjust the Y distance, no?
Node 20734
Main Window Inflated XYZ: 15.015987396, -110.156700134, -22.251829147
Shape: -2.904558420 -2.124466896
Node 32819
Main Window Inflated XYZ: 27.664737701, -77.988800049, -6.281192303
Distance: 38.076580048
Shape: -10.455765724 -8.209010124
So I compute -110 - -78 = 32 -- so this point is 32mm from the
occipital pole, so we need to find one whose y component of the
inflated coordinate is closer to like -110 + 24 = -86.
Hope this helps!
On 11/30/2006 06:53 AM, Mateus Joffily wrote:
Hi David,
Thanks for your reply. I asked for this capability because I am
trying to perform a spherical registration. Many landmarks are
defined as starting and terminating at a certain distance from an
anatomical reference point. I thought that a tool, which allows the
user to enter a reference point coordinate in the surface and, after,
displays every node that is at a given geodesic distance from it,
would be helpful
This capability is not essential for me. I was wondering if it was
already implemented in Caret.
Best regards,
Mateus
David Vanessen wrote:
Mateus,
First, it is important to clarify whether your request pertains to
nodes (as stated) or to foci. In Caret terminology, nodes refers
specifically to the points that make up a surface and have
locations specified within a coordinate file. Foci refers to
stereotaxically identified locations (typically fMRI activation
centers) that are specified within a foci file or foci projection
file. I'm guessing you are referring to foci, but let us know.
At present, I don't think that the capability you are asking about
exists for either nodes or foci. If you can let us know what you
will be using this for and whether this is a pressing need, it will
help us to prioritize the request. Also, if other Caret users
would like to see this functionality, let us know.
Best regards,
David
On Nov 29, 2006, at 11:28 AM, Donna Dierker wrote:
If you were talking about geodesic distance (i.e., running along
the contour of the fiducial surface -- not as the crow flies
through the CSF/WM), then you could use the Surface: ROI feature
for this purpose. (First operation Geodesic Distance, and then
threshold the resulting metric at the desired distance.)
I'm not aware of something like that for 3D distances, but there's
a Make Sphere feature in Window: Script Builder. Worst case, you
could generate a sphere around the enclosing voxel and map that
ROI volume to the surface.
On 11/29/2006 11:18 AM, Mateus Joffily wrote:
Hi,
In Caret5.5, is there a way of selecting a node and finding all
(or some) nodes that are at a given distance from it? I think I
am looking for something similar to what is described in section
2.17.2 (Foci Data Searches) of the 'Caret Tutorial – the Basics'.
But Section 2.17.2 regards only WebCaret. Does it exist something
similar to Caret5.5?
Thanks,
Mateus
_______________________________________________
caret-users mailing list
caret-users@brainvis.wustl.edu
http://pulvinar.wustl.edu/mailman/listinfo/caret-users
--
Donna L. Dierker
(Formerly Donna Hanlon; no change in marital status -- see http://
home.att.net/~donna.hanlon for details.)
_______________________________________________
caret-users mailing list
caret-users@brainvis.wustl.edu
http://pulvinar.wustl.edu/mailman/listinfo/caret-users
_______________________________________________
caret-users mailing list
caret-users@brainvis.wustl.edu
http://pulvinar.wustl.edu/mailman/listinfo/caret-users
_______________________________________________
caret-users mailing list
caret-users@brainvis.wustl.edu
http://pulvinar.wustl.edu/mailman/listinfo/caret-users
