. Author manuscript; available in PMC: 2015 Jun 15.

Published in final edited form as: Ultrason Imaging. 2012 Jan;34(1):1–14. doi: 10.1177/016173461203400101

Table 2.

Anatomic structures and model properties

Anatomy	Property	Comment
Uterus	Simplified version of full constitutive model^{19, 20} μ₀=10 kPa
Cervix	Simplified version of full constitutive model^{19, 20} μ₀= 0.5 - 50 kPa	Final result for cervix tissue modulus = 6.7 kPa (see results)
Fetal membranes	Incompressible hyperelastic; Polynomial strain energy function (C₁₀= 2 MPa, C₃₀=300 kPa); Thickness 1 mm	Contact with inner uterine surface (see methods)
Amniotic sac (fluid)	Bulk modulus 2.2 GPa; Intrauterine pressure 1 kPa	Volumetric compliance of water
Endopelvic fascia	Elastic, transversely isotropic; Longitudinal modulus 100 kPa; Transverse modulus 10 kPa Longitudinal shear modulus 5 kPa; Bulk modulus 10 MPa	Thickness 1 cm
Cardinal ligaments	See endopelvic fascia
Uterosacral ligaments	See endopelvic fascia
Abdominal cavity	Linear elastic; Modulus 10 kPa; Poisson’s ratio 0.1 – 0.4	Final result abdominal Poisson’s ratio= 0.2 (see results)
Abdominal fascia	Linear, isotropic elastic; Modulus 100 kPa; Poisson’s ratio 0.4
Pelvic floor	Linear, isotropic elastic; Modulus 1.0 MPa; Poisson’s ratio 0.4; Thickness 1 cm
Pelvic bones	Rigid constraint at pelvis inner surface	Figure 3
Spine	Rigid constraint at posterior midline	Figure 3