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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 57956 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Kavehvash, Zahra
- Abstract:
- Today, medical imaging is widely used to identify and characterize soft tissues, with various medical imaging techniques providing different types of information about soft tissue structures. Ultrasound imaging is one such method that is cost-effective and safe. Conventional ultrasound imaging, known as B-mode imaging, provides information about the amplitude of reflections and scatterings from soft tissues. However, this information is insufficient for a complete characterization of the tissue. To address this, another ultrasound imaging method has been developed: Ultrasound Shear Wave Elastography (SWEI), which models the shear modulus of soft tissues using shear wave speed (SWS). This method is applied in areas such as diagnosing liver fibrosis, breast cancer, and prostate cancer. The aim of this study is to implement and simulate the propagation of shear waves and subsequently measure the shear modulus. Shear waves generated were tested on a Zerdine ultrasound phantom, and the propagation of shear waves was observed and recorded using ultrafast angular imaging. Axial particle velocity was then evaluated using a 2D autocorrelator, and shear wave speed was calculated from the data obtained through these evaluations. This thesis focuses on ARF-based SWE, a subset of elastography methods that use an acoustic radiation force (ARF) source to induce shear wave propagation. This method provides a quantitative model of tissue stiffness based on shear wave speed. ARF-based excitation can be generated using any standard ultrasound transducer, as it does not require additional or specialized equipment. The first part of this study presents a brief overview of various ARF-based SWE techniques, followed by an examination of the general principles of the different types of ARF-based SWE utilized in this project. It then discusses safety considerations, followed by the results of simulations and practical experiments
- Keywords:
- Beam Shaping ; Medical Imaging ; Ultrasonic Imaging ; Tissue Elasticity Measurement ; Shear Wave Elastography ; Shear Wave Speed Measurement ; Acoustic Radiation
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