Hi all,

I’m trying to convert from Cartesian coordinates to polar coordinates for a heart lumen surface model. I used the module `Extract Centerline`

to generate a centerline and `Cross-section analysis`

to get some diameter data. However, I’m a bit confused from there.

- This table only contains ~2000 rows but the surface model should have 5002 points and the centerline curve has only 238 points. Where came those ~2000 points shown in the table and what is the column
`Distance`

mean? - Are the values under the column
`Diameter`

the diameters of maximal inscribed spheres for each point on the centerline? - Let’s say I’d like to save the mesh nodes on the surface model and convert their coordinates from Cartesian (Is this same as RAS btw?) to polar. Am I able to do this using the vmtk extension? If not, it would be greatly appreciated if anyone can suggest another method.

Thanks much,

Gening