Re: [caret-users] ROI - borders around clusters

2007-01-26 Thread Mateus Joffily
Hi Donna, I replicated your probelm exactly with the roi.zip archive you uploaded. It contained only the flat coord and cut topo; have you tried using the fiducial coord with closed topo? It may not help, but it's worth a try. Yes, the problem persists. Although the clusters using metri

Re: [caret-users] ROI - borders around clusters

2007-01-26 Thread Donna Dierker
Hi Mateus, It's true the top cluster is mostly dense, but look at the node I've highlighed in red in the attached capture. I wonder whether nodes like this that "cinch" the cluster cause the algorithm to give up. Attached is some code I dug out of the source that might be what Caret is actu

Re: [caret-users] ROI - borders around clusters

2007-01-26 Thread Mateus Joffily
Hi Donna, Thanks. I will look at the code and I let you know if I find something. Mateus Donna Dierker wrote: Hi Mateus, It's true the top cluster is mostly dense, but look at the node I've highlighed in red in the attached capture. I wonder whether nodes like this that "cinch" the cluste

[caret-users] ROI center of gravity

2007-01-26 Thread Mateus Joffily
Hi, I would like to calculate the center of gravity (COG) of a surface ROI. I see that 'Surface Region of Interest':'Statistical Report' gives me that information. However, if the nodes distribution over the surface is not uniform, the COG is biased toward the more dense regions. I understand

Re: [caret-users] ROI center of gravity

2007-01-26 Thread DG MCLAREN
Mateus, You raise a good point. In practice, it seems that you should keep the uneven distribution of nodes. The reason is as follows: If you resample the nodes to a more sparse uniform distribution, then you will distort the surface to some degree. The surface distortion will inevitable shif

[caret-users] caret question

2007-01-26 Thread Eugene Tunik
Hello, I'm new to caret. I've created an inflated surface using the Colin-SPM2-L/R fiducial and would like to save this inflated surface for future mapping of functionals data. If I'm correct, it's simply a matter of File - save data file - save as a "scene". However, when reloading the spec file

Re: [caret-users] caret question

2007-01-26 Thread Donna Dierker
Hi Gene, It sounds like you've actually created a new coord file -- an inflated version of a the colin SPM2 fiducial. So if you wanted to use this later, you'd need to save it as a separate coord file. Then you could use D/C: Scene to append a scene using this coord file, and then save the