The invention relates to a method and computer readable medium for
analyzing an object data set that includes points in a multi-dimensional
space and in which a tubular structure occurs. The method includes
determining a number of points forming part of the surface of the tubular
structure in the vicinity of a selected position, and calculating a
gradient to the surface for each of the points. The method further
includes using the selection of points to calculate an orientation for a
cutting plane such that the direction thereof is as parallel as possible
to the longitudinal axis of the tubular structure at the selected
position.