SNAKE Tool on a second image

[Richard Kahan]

Hi,

I am an endodontist and very new to itksnap (which is wonderful).

I am comparing the size of radiolucent lesions within the maxilla/mandible over time. 

The main image is the pre-op CBCT scan and the second image following treatment. 

I can segment the main image using the SNAKE tool and produce statistics for the lesion. 

I can do manual segmentation on the second image but I cannot select the second image to carry out semi-automatic segmentation. 

Can I do the same for the second image simply, without using the command line?

Many thanks...