Difference-Frequency Ultrasound Imaging With Non-Linear Contrast

Dual-Frequency Piezoelectric Transducers for Contrast Enhanced Ultrasound Imaging

For many years, ultrasound has provided clinicians with an affordable and effective imaging tool for applications ranging from cardiology to obstetrics. Development of microbubble contrast agents over the past several decades has enabled ultrasound to distinguish between blood flow and surrounding tissue. Current clinical practices using microbubble contrast agents rely heavily on user training...

Quantification of Ultrasound Contrast Agents Using High Frequency Ultrasound

Ultrasound contrast agents (UCAs) are small microbubbles filled with gas. Because of their scattering properties, 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 establ...

Excitation of polymer-shelled contrast agents with high-frequency ultrasound.

Few experimental and complementary theoretical studies have investigated high-frequency (>20 MHz) nonlinear responses from polymer-shelled ultrasound contrast agents. Three polymer agents with different shell properties were examined for their single-bubble backscatter when excited with a 40 MHz tone burst. Higher-order harmonic responses were observed for the three agents; however, their occur...

Nonlinear Contrast Agent Imaging with a High Frequency Linear Array Based System

Non-contrast enhanced vascular imaging with MRI