Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 12 of 12 for “"Ultrasonic Backscatter"”.
-
3D Temperature Imaging Using Ultrasonic Backscatter Energy during Non-Uniform Tissue Heating
… and Arthur predicted monotonic changes in backscattered energy (CBE) of ultrasound with temperature. Measured CBE values from bovine liver, turkey breast, and pork muscle in 1D and 2D matched their prediction. In this study, the volumetric (3D) change in ultrasonic backscattered energy …
-
Estimating the concentration of ultrasound contrast agents using ultrasonic backscatter in vitro
… extracting estimates of UCA concentration using backscatter coefficients (BSCs) was developed and verified in vitro. Experiments to verify the method were performed with both UCAs and glass bead microspheres in degassed water using a beaker setup and a flow system setup. Experimentally obtained …
-
Ultrasonic backscatter coefficient quantitative estimates from Chinese hamster ovary and BALB/3T3 cell pellet biophantoms
… technique is introduced and applied to the ultrasonic backscatter coefficient (BSC) estimate using Chinese hamster ovary (CHO), and new and old 3T3 cells. Also introduced, for its geometrical similarities to eukaryotic cells, is a concentric sphere scattering model. BSC estimates from cell …
-
Improved Techniques for Statistical Analysis of the Envelope of Backscattered Ultrasound Using the Homodyned K Distribution
… imaging modality for diagnostics. Conventional ultrasonic imaging is qualitative in nature with spatial resolution up to hundreds of micrometers. Quantitative ultrasound techniques based on ultrasonic backscatter can provide estimates describing tissue microstructure. Improving quantitative …
-
Quantification of Ultrasound Contrast Agents Using High-Frequency Ultrasound
… UCAs enhance the diagnostic capabilities of ultrasonic imaging. UCAs are associated with therapeutic or enhancing therapeutic applications of ultrasound and with possible adverse bioeffects. Quantification of the in vivo concentration of microbubbles is therefore essential to establishing a …
-
Real-time beam visualization and therapy planning for focused ultrasound therapies using a diagnostic imaging array
… for real-time visualization of an FUS beam using ultrasonic backscatter. A diagnostic imaging array was used to receive backscatter from an FUS beam interacting with tissue and the backscatter was processed to reconstruct the intensity field of the FUS beam. The intensity field reconstruction was …
-
Physics of ultrasonic wave propagation in bone and heart characterized using Bayesian parameter estimation
… the physics underlying the propagation of ultrasonic waves in bone and in heart tissue through the use of Bayesian probability theory. Quantitative ultrasound is a noninvasive modality used for clinical detection, characterization, and evaluation of bone quality and cardiovascular disease. …
-
Three-dimensional acoustic impedance map analysis of soft tissue
… microstructure acoustically. From the 3DZM, the ultrasonic backscattered power spectrum can be predicted and model based scatterer properties, such as effective scatterer diameter (ESD), can be estimated. Additionally, the 3DZM can be exploited to visualize and identify possible scattering sites, …
-
Damage assessment in reinforced concrete using contactless ultrasound
… concrete structures. Conventional contact-type ultrasonic testing (UT) methods offer efficient and useful approaches to characterize internal defects in concrete structures in a nondestructive fashion. However, the large testing areas normally associated with concrete structures make …
-
Using two-dimensional impedance maps to study acoustic properties of tissue microstructure
… monitoring therapy. In one approach to QUS, the backscatter coefficient (BSC) from a tissue is utilized to quantify and classify tissue state. The BSC is a fundamental property of a tissue based on the frequency power spectrum estimated from the RF signals corresponding to ultrasonic backscatter. …
-
Development and Application of Three-dimensional Impedance Maps Related to Tissue Pathology
… tissue models are a unique means to study ultrasonic scattering by tissue microstructure. In this work, the previous methods used to create and analyze these models were evaluated and refined. These techniques were then applied to a set of 10 human fibroadenomas, a benign tumor of the …
-
Backscatter and Attenuation Characterization of Ventricular Myocardium
This Dissertation presents quantitative ultrasonic measurements of the myocardium in fetal hearts and adult human hearts with the goal of studying the physics of sound waves incident upon anisotropic and inhomogeneous materials. Ultrasound has been used as a clinical tool to assess heart structure …