scholarly journals An Anthropometric-Based Subject-Specific Finite Element Model of the Human Breast for Predicting Large Deformations

2015 ◽  
Vol 3 ◽  
Author(s):  
Silvia Pianigiani ◽  
Leonardo Ruggiero ◽  
Bernardo Innocenti
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Large Deformations ◽  
Element Model ◽  
Human Breast ◽  
Subject Specific

EVALUATION OF A SUBJECT SPECIFIC FINITE ELEMENT MODEL IN A SIDE LOAD CONFIGURATION

2012 ◽  
Vol 45 ◽  
pp. S526
Author(s):  
R. Allena ◽  
L. Duchemin ◽  
V. Bousson ◽  
D. Mitton ◽  
J.D. Laredo ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Side Load ◽  
Subject Specific

Two-dimensional finite element model to study temperature distribution in peripheral regions of extended spherical human organs involving uniformly perfused tumors

2015 ◽  
Vol 08 (06) ◽  
pp. 1550074 ◽  
Author(s):  
Akshara Makrariya ◽  
Neeru Adlakha
Keyword(s):  
Finite Element ◽  
Temperature Distribution ◽  
Finite Element Model ◽  
Metabolic Activity ◽  
Element Model ◽  
The Body ◽  
Tissue Response ◽  
Two Dimensional ◽  
Human Breast ◽  
Peripheral Regions

Temperature as an indicator of tissue response is widely used in clinical applications. In view of above a problem of temperature distribution in peripheral regions of extended spherical organs of a human body like, human breast involving uniformly perfused tumor is investigated in this paper. The human breast is assumed to be spherical in shape with upper hemisphere projecting out from the trunk of the body and lower hemisphere is considered to be a part of the body core. The outer surface of the breast is assumed to be exposed to the environment from where the heat loss takes place by conduction, convection, radiation and evaporation. The heat transfer from core to the surface takes place by thermal conduction and blood perfusion. Also metabolic activity takes place at different rates in different layers of the breast. An elliptical-shaped tumor is assumed to be present in the dermis region of human breast. A finite element model is developed for a two-dimensional steady state case incorporating the important parameters like blood flow, metabolic activity and thermal conductivity. The triangular ring elements are employed to discretize the region. Appropriate boundary conditions are framed using biophysical conditions. The numerical results are used to study the effect of tumor on temperature distribution in the region.

A subject-specific integrative biomechanical framework of the pelvis for gait analysis

2018 ◽  
Vol 232 (11) ◽  
pp. 1083-1097
Author(s):  
Emiliano P Ravera ◽  
Marcos J Crespo ◽  
Paola A Catalfamo Formento
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Gait Analysis ◽  
Material Properties ◽  
Element Model ◽  
Musculoskeletal Model ◽  
Pelvic Bone ◽  
Subject Specific ◽  
Specific Material ◽  
The Finite Element Model

Analysis of the human locomotor system using rigid-body musculoskeletal models has increased in the biomechanical community with the objective of studying muscle activations of different movements. Simultaneously, the finite element method has emerged as a complementary approach for analyzing the mechanical behavior of tissues. This study presents an integrative biomechanical framework for gait analysis by linking a musculoskeletal model and a subject-specific finite element model of the pelvis. To investigate its performance, a convergence study was performed and its sensitivity to the use of non-subject-specific material properties was studied. The total hip joint force estimated by the rigid musculoskeletal model and by the finite element model showed good agreement, suggesting that the integrative approach estimates adequately (in shape and magnitude) the hip total contact force. Previous studies found movements of up to 1.4 mm in the anterior–posterior direction, for single leg stance. These results are comparable with the displacement values found in this study: 0–0.5 mm in the sagittal axis. Maximum von Mises stress values of approximately 17 MPa were found in the pelvic bone. Comparing this results with a previous study of our group, the new findings show that the introduction of muscular boundary conditions and the flexion–extension movement of the hip reduce the regions of high stress and distributes more uniformly the stress across the pelvic bone. Thus, it is thought that muscle force has a relevant impact in reducing stresses in pelvic bone during walking of the finite element model proposed in this study. Future work will focus on including other deformable structures, such as the femur and the tibia, and subject-specific material properties.

IMAGE-BASED SKELETAL MUSCLE COORDINATION: CASE STUDY ON A SUBJECT SPECIFIC FACIAL MIMIC SIMULATION

2018 ◽  
Vol 18 (02) ◽  
pp. 1850020 ◽  
Author(s):  
TIEN TUAN DAO ◽  
ANG-XIAO FAN ◽  
STÉPHANIE DAKPÉ ◽  
PHILIPPE POULETAUT ◽  
MOHAMED RACHIK ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Coordination Mechanism ◽  
Neutral Position ◽  
Muscle Coordination ◽  
Facial Muscle ◽  
Facial Muscles ◽  
Subject Specific

Facial muscle coordination is a fundamental mechanism for facial mimics and expressions. The understanding of this complex mechanism leads to better diagnosis and treatment of facial disorders like facial palsy or disfigurement. The objective of this work was to use magnetic resonance imaging (MRI) technique to characterize the activation behavior of facial muscles and then simulate their coordination mechanism using a subject specific finite element model. MRI data of lower head of a healthy subject were acquired in neutral and in the pronunciation of the sound [o] positions. Then, a finite element model was derived directly from acquired MRI images in neutral position. Transversely-isotropic, hyperelastic, quasi-incompressible behavior law was implemented for modeling facial muscles. The simulation to produce the pronunciation of the sound [o] was performed by the cumulative coordination between three pairs of facial mimic muscles (Zygomaticus Major (ZM), Levator Labii Superioris (LLS), Levator Anguli Oris (LAO)). Mean displacement amplitude showed a good agreement with a relative deviation of 15% between numerical outcome and MRI-based measurement when all three muscles are involved. This study elucidates, for the first time, the facial muscle coordination using in vivo data leading to improve the model understanding and simulation outcomes.

Evaluation of a subject-specific finite-element model of the equine metacarpophalangeal joint under physiological load

2014 ◽  
Vol 47 (1) ◽  
pp. 65-73 ◽  
Author(s):  
Simon M. Harrison ◽  
R. Chris Whitton ◽  
Chris E. Kawcak ◽  
Susan M. Stover ◽  
Marcus G. Pandy
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Metacarpophalangeal Joint ◽  
Physiological Load ◽  
Subject Specific
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