Ultrasonic Estimation of Soft Tissue Visco Elastic Properties
Hassan M. Ahmed
备注：
2012 Masters thesis I would like to acknowledge my supervisors; Prof. Nancy M. Salem, Prof. Ahmed Farag Seddik and Prof. Mohamed Ibrahim El Adawy; for their great guidance and thorough review of my thesis
Conventional imaging of diagnostic ultrasound is widely used. Although it makes the differences in the soft tissues echogenicities' apparent and clear, it fails in describing and estimating the soft tissue mechanical properties. It cannot portray their mechanical properties, such as the elasticity and stiffness. Estimating the mechanical properties increases chances of the identification of lesions or any pathological changes. Physicians are now characterizing the tissue's mechanical properties as diagnostic metrics. Estimating the tissue's mechanical properties is achieved by applying an Acoustic Radiation Force Impulse (ARFI) on the tissue and calculating the resulted shear wave speed. Due to the difficulty of calculating the shear wave speed precisely inside the tissue, it is estimated by analyzing ultrasound images of the tissue at a very high frame rate. In this study, the shear wave speed is estimated using finite element analysis. A two-dimensional model is constructed to simulate the tissue's mechanical properties. For a generalized soft tissue model, Agar-gelatine model is used because it has similar properties to the soft tissue. A point force is applied at the center of the proposed model. As a result of this force, a deformation is caused. Peak displacements are tracked along the lateral dimension of the model to estimate the shear wave speed of the propagating wave using the Time-To-Peak displacement (TTP) method.
Ultrasonic Medical Tissue Imaging Using Probabilistic Inversion: Leveraging Variational Inference for Speed Reconstruction and Uncertainty Quantification
Real-time 3D Ultrasonic Needle Tracking with a Photoacoustic Beacon
King’s College London（伦敦国王学院）；University College London（伦敦大学学院）；GBA Institute of Collaborative Innovation（粤港澳大湾区协同创新研究院）；University College London Hospitals NHS Foundation Trust（伦敦大学学院医院NHS基金会信托）；Guys and St Thomas’ NHS Trust（盖伊和圣托马斯NHS信托）
A reduced viscoelastic FDTD formulation for ultrasound-driven shear wave propagation in soft tissue
Lampe Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University（北卡罗来纳大学教堂山分校与北卡罗来纳州立大学联合生物医学工程系）
Enhanced Instantaneous Elastography in Tissues and Hard Materials Using Bulk Modulus and Density Determined without Externally Applied Material Deformation
