Image analysis software for processing of VMI images is available from our article in the Journal of Chemical Physics “Special Topic: Developments and Applications of Velocity Mapped Imaging Techniques”, Jason R. Gascooke, Stephen T. Gibson, and Warren D. Lawrance (2017). A “circularisation” method to repair deformations and determine the centre of velocity map images. Journal of Chemical Physics 147, 013924
[10.1063/1.4981024]