I am looking for a way to automatically generate a surface label file of a specific dimension (e.g. a circle with a specific diameter, or a square), given a specific vertex and some measure of the desired size.

I have considered to do so by starting with a label file consisting of a single vertex, and then expanding this label with the mri_label2label tool, using the --dilate option. I wanted to know though if anyone has any better suggestions.

Thank you,

Martha