Classification of Prostate Cancer Grades and T-Stages based on Tissue Elasticity Using Medical Image Analysis Supplementary Document

In this supplementary document, we introduce some basic concepts in the continuum mechanics for readers, who may not be familiar with some of these terminology and models. Stress is defined simply as Force/Area, but some complexity arises, because the relative orientation of the force vector to the surface normal dictates the type of stress [2]. When the force vector is normal to the surface, as shown in Fig. 1, the stress is referred to as " normal stress " and represented by σ [2]. When the force vector is parallel to the Fig. 1. This figure shows force vector normal to the surface or parallel to the surface. Copyright Wikipedia [9]