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.
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Showing 1 to 20 of 27 for “"high frequency ultrasound"”.
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High-Frequency Ultrasound Drug Delivery and Cavitation
… of polymeric micelles and triggers release by ultrasound application was investigated at an applied frequency of 500 kHz. The investigation also included elucidating the mechanism of drug release at 70 kHz, a frequency which had previously been shown to induce drug release. A fluorescence …
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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 …
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Characteristics of blood vessel wall and atherosclerosis using high frequency ultrasound signals
… many techniques like electrocardiogram, x-rays, ultrasound, electroencephalogram, computed tomography and magnetic resonance imaging use signal and image processing techniques to determine the physical and biological properties of the tissues and organs. The underlying principle in signal …
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High-Performance CMOS Front-End ASICs for SiPM Detectors and High-Frequency Ultrasound and Photoacoustic Imaging
Silicon photomultiplier (SiPM), as a high sensitivity photon detector, has been widely used in high energy physics, positron emission tomography imaging, and light detection and ranging applications. The slow-rising edge of standard SiPM signal, however, makes the timing measurement sensitive to …
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Ultrasound tissue displacement and tissue elasticity imaging
… we investigate the feasibility of using high frequency ultrasound, to measure tissue motion and tissue elasticity for medical imaging applications. Ultrasound provides a means for non-invasive imaging of soft tissues, providing soft tissue contrast that cannot be achieved using …
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Acoustic characterisation of ultrasound contrast agents at high frequency
… aims to investigate the acoustic properties of ultrasound contrast agents (UCAs) at high ultrasound frequencies. In recent years, there has been increasing development in the use of high frequency ultrasound in the fields of preclinical, intravascular, ophthalmology and superficial tissue …
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Characterization of high temperature creep in siliconized silicon carbide using ultrasonic techniques
… containing various degrees of damage due to high temperature creep. These results were compared with parameters associated with creep damage such as strain and cavity formation, in order to better understand the mechanisms of creep in Si/SiC and to determine if ultrasonics can be used in …
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Design and construction of an ultrasonic probe for use in a Cryo-Magnet NMR Spectrometer
… particles suspended in a support medium, using high frequency ultrasound in the range 2-10 MHz. The width of the normal broad resonances from solids are due to incomplete averaging of several components of the total spin Hamiltonian caused by restrictions placed on molecular motion within a …
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Ultrasound : an alternative solution for removing tattoos
… tattoo removals. Due to the recent success of ultrasound as a noninvasive alternative for multiple medical therapies, the feasibility of ultrasound-mediated tattoo removals will be investigated in this thesis. During tattoo applications, dermal cells consume and store tattoo particles in …
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Investing the effects of body-coupled ultrasound on the auditory system for a novel hearing aid
Ultrasound stimulation (US) is a popular therapeutic tool that has been shown to induce auditory perceptions when coupled to the mastoid of human subjects. This technology has the potential to create new hearing devices that provide benefits that traditional hearing prosthetics are not able due to …
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Passive materials for high frequency piezocomposite ultrasonic transducers
High frequency ultrasound is receiving increased attention for medical imaging in areas such as ophthalmology and dermatology. Recent advances in the manufacture of fine scale piezocomposite materials mean there is great potential for commercial transducers far superior to conventional devices …
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Quantifying dermatology : method and device for user-independent ultrasound measurement of skin thickness
… technique to acquire and construct 3D volumetric ultrasound data of the hand and arm. The Repeated Skin Thickness Measurement (RSTM) Device moves a high frequency ultrasound probe linearly in 3 axes in a water tank and images a submerged arm. These images are combined into an ultrasound volume, …
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Multi-Frequency Processing for Lumen Enhancement with Wideband Intravascular Ultrasound
The application of high frequency ultrasound is the key to higher resolution intravascular ultrasound (IVUS) images. The need to further improve the IVUS spatial resolution may drive the transducer center frequency even higher than the current 40 MHz range. However, increasing the center frequency …
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High frequency ultrasonic characterization of human skin In vivo
High frequency (>20 MHz) ultrasound has numerous potential applications in dermatology because of its ability to penetrate several millimeters into the skin and provide information at a spatial resolution of tens of microns. However, conventional B-scan images of skin tissues often lack the …
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The utilisation of high frequency mini probe colonoscopic ultrasound in the assessment of colorectal disease
… looks at the feasibility of colonoscopic high frequency ultrasound in the colon using mini probe technology. The objectives are across four different areas with assessment of colonic cancer, malignant colorectal polyps, rectal polyps and diverticular disease<br/>High frequency 12 and 20 …
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Assessing Endothelial Dysfunction Estimating the Differences Between 3 Minute and 5 Minute Reactive Hyperemia
… clinical benchmark performed in hospitals uses high-frequency ultrasound with a standard cuff occlusion time of 5 minutes. Although noninvasive, 5 minutes of cuff occlusion causes slight discomfort to the patient and is not desirable. This test was improved and shortened by using a system based …
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Microultrasound Imaging of Tissue Dysplasia
… the following detailed aims:Development of high frequency, broadband µUS (micro-ultrasound) imaging transducers through optimization of ultra-thinning processes for lithium niobate (LNO) and fabrication of novel ‘mass-spring’ matching layers using carefully controlled vacuum deposition is …
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Ultrasound stimulated acoustic emission for monitoring thermal surgery
Therapeutic ultrasound describes a non-invasive surgical technique by which high-energy ultrasound is delivered to malignant tissue. This method must be monitored in order to ensure that the correct tissues are treated and that the tissues are treated with the proper dose. Typically, therapeutic …
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Shear Wave Elastography Based on Optical Coherence Tomography
… new field, enabled by the recent advances in high-resolution medical imaging techniques e.g. high-frequency ultrasound imaging and Optical Coherence Tomography (OCT). The quantitative elastography technique based on OCT, known as quantitative optical coherence elastography (OCE) is a new …
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Fabrication of Ultrasound Transducers and Arrays Integrated within Needles for Imaging Guidance and Diagnosis
As opposed to current Intraoperative Ultrasound (IOUS) systems and their relatively large probes and limited superficial high frequency imaging, the use of a biopsy needle with an integrated transducer that is capable of minimally invasive and high-resolution ultrasound imaging is proposed. Such a …
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