mris_curvature -max -w <path>/lh.white

will write out the max curvature at each vertex to a file named lh.white.max. Load this into tksurfer as a using the file->load curvature menu.

You can then create a path in tksurfer by clicking on two end points, and type

plot_curv 0

at the tcl (%) prompt. This will create a file named surfer_curv.dat, which has one row/vertex in the path with each column being:

vno x y z distance curv val val2 stat amp

the "curv" field will give you the max curvature at each point

cheers Bruce

On Fri, 4 Mar 2011, Allie Rosen wrote:

Hi Bruce,

I managed to draw and save a curve over my area of interest. I am not quite sure what to do next. While in the subject folder, I tried typing:

mris_curvature -w [the name of my path]

to no avail. Any thoughts?

Thanks, Allison

On Fri, Mar 4, 2011 at 11:36 AM, Allie Rosen rosen.allie@gmail.com wrote:

...

Hi Bruce,

Thanks for your response - I'll try this out and see how it goes!

Allison

On Thu, Mar 3, 2011 at 6:16 PM, Bruce Fischl fischl@nmr.mgh.harvard.eduwrote:

...

Hi Allison

I guess you could draw a curve on the surface and count the # of local maxima in the first principal curvature (which can be generates using mris_curvature -w...)

cheers Bruce

On Thu, 3 Mar 2011, Allie Rosen wrote:

Hello everyone,

...

I am interested in counting the number of gyri in a specific region of the brain. I am aware of the Local Gyrification Index feature, but am hoping to get precise numbers of gyri. Is there any way to do this? (By the way, I do not have Matlab)

Thank you for your help,

Allison Rosen, MSc Graduate Student, Department of Neurosurgery Toronto Western Hospital 14-327 399 Bathurst St. University of Toronto

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