Can I use flatsym module for elekta versa hd? because in the documents it is showing for varian
It shows for both Varian and Elekta: https://pylinac.readthedocs.io/en/latest/flatsym.html#analysis-definitions. You can also add your own equation definition to analyze the profile the way you like: https://pylinac.readthedocs.io/en/latest/flatsym.html#creating-using-custom-algorithms