[caret-users] draw borders for spherical registration

[John Harwell]

Hi Julia,

During the flattening process, the medial wall border is normally  
drawn on the Compressed Medial Wall Surface.  The CMW surface is a  
sphere with the medial portion made flat so that 2D borders can be  
drawn on it.  This surface should be selected from the model  
selection control in the main window's toolbar.

The "Smooth Fiducial Medial Wall" option results in the fiducial  
surface's medial wall being smoothed during the flattening process.   
Smoothing will change the shape of the medial wall so that it is  
relatively flat.  This option does not affect the sphere.  There is  
normally some distortion around on the sphere that should be removed  
by the morphing process that is part of flattening.

----------------------------------------------------------
John Harwell
john at brainvis.wustl.edu
314-362-3467

Department of Anatomy and Neurobiology
Washington University School of Medicine
660 S. Euclid Ave.    Box 8108
St. Louis, MO 63110   USA

On Jul 2, 2007, at 10:09 AM, Julia Molony wrote:

> I'm attempting to go through Caret's spherical registration stuff  
> but first I need to work out how to draw all the borders.  I'm  
> following the 5.5 tutorial and I'm stuck trying to draw the medial  
> wall borders.  When I open the draw borders dialogue, choose the  
> border name, set type to closed and dimension to 2D, and press  
> apply, I can't draw the border.  I click on the sphere and hold the  
> left mouse button and nothing is drawn.  Any ideas on what's going  
> on?  I checked the D/C to see if "show borders" was selected and it  
> is.  I've drawn borders in the past with no trouble, so I'm not  
> sure what's happening here.
>
> Also, what does it mean in the "Flatten Full or Partial Hemisphere"  
> box when it says "Smooth Fiducial Medial Wall".  It looks like this  
> smoothing is causing distortions in the sphere.  It makes the  
> sphere look sort of swirly around the medial wall area.
>
> Julia
>
>
> --
> Julia Molony
> SSCC/NIMH/NIH
>
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