I Nteractive 2d Am! 3d Object Definition in Jvied Ical I Mages Based on ::vlu L~i Resol U Tion Image Descriptions

We present means of interactive definition of anatomic objects in medical images via a desl.Tiption of the image in terms of visually sensible regions. The description is produced by computing srrucrures capturing image geometry and following them through the image simplification of Gaussian blurring. In particular, we suggest that the s1l'llcture made from intensity "ridge" and "course" curves defined by the locus of intensity level curve vertices, augmented by the pile of internal and external symmetric axes of these level curves, satisfies desirable criteria for a srrucrure on which to base such object definition.