C. Tanner et al, Comparison of Biomechanical Breast Models:
a Case Study, SPIE02
We present initial results from evaluating the accuracy with which
biomechanical breast models based on finite element methods
can predict the displacements of tissue within the breast.
We investigate the influence
of different tissue elasticity values, Poisson's ratios, boundary
conditions, finite element solvers and mesh resolutions on one data set.
MR images were acquired before and after compressing a volunteer's
breast gently. These images were aligned using a
3D non-rigid registration algorithm. The boundary conditions were derived
from the result of the non-rigid registration
or by assuming no
patient motion at the deep or medial side.
Three linear and two
non-linear elastic material models were tested.
The accuracy of the BBMs was assessed by the Euclidean distance
of twelve corresponding anatomical landmarks.
Overall, none of the tested material models was obviously superior to another
regarding the set of investigated values.
A major average error increase
was noted for partially inaccurate boundary conditions
at high Poisson's ratios due to introduced volume change.
Maximal errors remained, however, high for low Poisson's ratio
due to the landmarks closeness to the inaccurate boundary conditions.
The choice of finite element solver or mesh resolution had almost no
effect on the performance outcome.
Last modified: Tue Jan 29 17:15:50 GMT 2002