Measuring Cross-Sectional Area of Slice

Hello All,

I have exported surface meshes from ITK-snap and am trying to measure the cross-sectional area of an arbitrary slice. This is a surface mesh so there is no interior points, so when taking a slice only the external surface of the mesh remains, leaving a continuous boundary. Is there a way I can measure the area enclosed by the boundary?

When I apply the ‘IntegrateVariables’ filter and switch to CellData I am only given the length of the line that represents the boundary. The cross sections are arbitrarily shaped.