Biomedical Engineering Reference
In-Depth Information
9
ALTERNATE SPACES FOR MODEL
DEFORMATION:
APPLICATION OF STOP AND GO
ACTIVE MODELS TO MEDICAL IMAGES
Oriol Pujol
Departamento Matem atica Aplicada i An alisi
Universidad de Barcelona, Barcelona, Spain
Petia Radeva
Centre de Visi o per Computador, Universidad
Aut onoma de Barcelona
Barcelona, Spain
1.
INTRODUCTION
The role of deformable models [1, 2, 3], in medical image analysis [4] has
been increasing over the past two decades. The location of a pathology, the study
of anatomical structures, computer-assisted surgery, or quantification of tissue
volumes are a few of the applications in which deformable models have proved to
be very effective. Due to their importance, the study and improvement of these
models is still a challenge [5, 6, 7, 8]. These techniques are used to give a high-
level interpretation of low-level information such as contours or isolated regions.
These techniques depend on the balance between internal and external constraints.
The external constraints are designed to guide the deformable model to the regions
