OF THE DISSERTATION Comparison of Conventional and Bayesian Analysis for the Ultrasonic Characterization of Cancellous Bone by Amber Mae Groopman Doctor of Philosophy in Physics Washington University in St. Louis, 2014 Professor James G. Miller, Chair This dissertation investigates the physics underlying the propagation of ultrasonic waves in cancellous bone. Although quantitative ultrasound ha...

a new method for the synthesis of nano zero-valent iron (nzvi) was developed in the present study.ultrasonic waves, as a novel method, were used to synthesize the nanoparticles. the morphologyand surface compositions of the particles were characterized by using fesem, xrd, bet, andparticle size analyzer. the synthesized nanoparticles were then utilized as a fenton-like catalyst todegrade of hyd...

The ultrasound radiation force has been used for noncontact excitation of devices ranging from microcantilevers to acoustic guitars. For ultrasound radiation force excitation, one challenge is formation of standing waves between the ultrasound transducer and the device under test. Standing waves result in constructive/destructive interference causing significant variations in the intensity of t...

Several hybrid tomographic methods utilizing ultrasound modulation have been introduced lately. Success of these methods hinges on the feasibility of focusing ultrasound waves at an arbitrary point of interest. Such focusing, however, is difficult to achieve in practice. We thus propose a way to avoid the use of focused waves through what we call synthetic focusing, i.e. by reconstructing the w...

A dual mode scanning acoustic microscope is investigated, yielding simultaneously images with optical and acoustical contrast. Short laser pulses are used to excite acoustic waves in a sample for the photoacoustic imaging mode. At the same time the pulses irradiate a conical target generating limited diffraction acoustic waves (X-waves) for large depth of field ultrasound imaging. For photoacou...

Ultrasound imaging is a wide spread technique used to view body soft tissues, like tendons, muscle or internal organs for possible problems. These images are achieved by capturing the returned acoustic waves using an ultrasonic transducer. Due to the propagation in imperfect environment, the resolution of these images has a poor quality. This is caused by different problems like waves refractio...

In the simplest form of ultrasonography, ultrasound is transmitted as a continuous beam from a probe that contains two piezoelectric crystals. The transmitting crystal produces ultrasound at a fixed frequency (set by the operator according to the depth of the vessel being examined), and the receiving crystal vibrates in response to reflected waves and produces an output voltage. Conventional B ...

The development of the obstetric ultrasound [6] has allowed physicians and embryologists to obtain a clear picture of the developing human embryo and fetus [7] during pregnancy [8]. Obstetric ultrasonography, often referred to as ultrasound [6], is a technology that uses sound waves to produce images of structures inside the human body. A handheld probe emits sound waves, which are reflected ba...

The development of the obstetric ultrasound [6] has allowed physicians and embryologists to obtain a clear picture of the developing human embryo and fetus [7] during pregnancy [8]. Obstetric ultrasonography, often referred to as ultrasound [6], is a technology that uses sound waves to produce images of structures inside the human body. A handheld probe emits sound waves, which are reflected ba...

The development of the obstetric ultrasound [6] has allowed physicians and embryologists to obtain a clear picture of the developing human embryo and fetus [7] during pregnancy [8]. Obstetric ultrasonography, often referred to as ultrasound [6], is a technology that uses sound waves to produce images of structures inside the human body. A handheld probe emits sound waves, which are reflected ba...