On the Three-Dimensional Mechanical Behavior of Human Breast Tissue

Area of Science:

• Biomechanics
• Materials Science
• Medical Imaging

Background:

• Accurate three-dimensional (3D) characterization of human breast mechanical behavior is vital for diagnosis, treatment, and surgical planning.
• Current constitutive models for breast tissue lack the complexity to represent its anisotropic and heterogeneous fibrous structure.
• A need exists for detailed 3D analyses to better understand and simulate breast tissue mechanics.

Purpose of the Study:

• To perform a full 3D kinematic mechanical evaluation of human fibroglandular and adipose breast tissues.
• To develop a novel constitutive model capable of simulating the observed anisotropic behaviors.
• To determine constitutive model parameters using finite element analysis and nonlinear optimization.

Main Methods:

• A 3D kinematic numerical-experimental approach was used to collect force-displacement data.
• Cuboidal specimens of fibroglandular and adipose tissues were subjected to pure shear and simple compression loading.
• A novel constitutive model was developed and validated against experimental data using finite element analysis.

Main Results:

• Human breast tissues demonstrated complex anisotropic mechanical behavior with significant direction-dependent non-linearities, particularly in fibroglandular tissue.
• The novel constitutive model successfully simulated these anisotropic behaviors, including combined tension and compression states.
• The study quantified the anisotropic mechanical response of different human breast tissue subtypes.

Conclusions:

• Human breast tissue exhibits complex mechanical responses with varying degrees of anisotropy.
• The developed constitutive model accurately captures the anisotropic and nonlinear mechanical properties of breast tissue.
• Further research is needed to correlate tissue structure with observed anisotropy and map heterogeneity across individuals.