Abstract
Imaging modalities that can be used intra-operatively do not provide
sufficient details to confidently locate the abnormalities and critical
healthy areas that have been identified from high-resolution pre-operative
scans. However, as we have shown in our previous work, high quality
pre-operative images can be warped to the intra-operative position
of the brain. This can be achieved by computing deformations within
the brain using a biomechanical model. In this paper, using a previously
developed patient-specific model of brain undergoing craniotomy-induced
shift, we conduct a parametric analysis to investigate in detail
the influences of constitutive models of the brain tissue. We conclude
that the choice of the brain tissue constitutive model, when used
with an appropriate finite deformation solution, does not affect
the accuracy of computed displacements, and therefore a simple linear
elastic model for the brain tissue is sufficient.
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