Searched for: subject:"ultrasound"
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Westhoek, Youri (author)
Implantable medical devices (IMDs) such as cardiac pacemakers, cochlear implants, and neurostimulators improve millions of people’s lives every day. Over the years, IMDs have significantly improved in function, increased in lifetime, and decreased in size. However, further miniaturisation is limited by the batteries used to power these devices,...
master thesis 2020
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Dijkema, Eric (author)
Ultrasound (US) neurostimulation, the non-pharmacological, reversible excitation or inhibition of the nervous system using ultrasonic waves, is emerging as a high interest topic in neurostimulation research. In the current project, an attempt was made to demonstrate US neuromodulation in a Lumbricus Terrestris model of evoked compound action...
master thesis 2020
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Vijayakumar, Arvind (author)
Capacitive micromachined ultrasonic transducer (CMUT) technology has been considered as a promising alternative for the conventional piezo electric-based technology in ultrasound imaging systems. Its potential advantages include better image quality, higher operational frequency, and ease of fabrication and<br/>integration with CMOS read-out...
master thesis 2020
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Tams, Jelle (author)
This work presents a type of low noise amplifiers (LNA) that are used for ultrasound imaging systems. To account for the attenuating nature of ultrasound echo signals, a so-called time gain compensation (TGC) circuit is required. By increasing the gain over time, the output dynamic range is decreased, while the switching artifacts are suppressed...
master thesis 2020
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Klaassen, Lisa (author)
Introduction: Uveal melanoma is the most frequently occurring primary eye tumour. The aim of this research was to determine the difference in geometrical tumour measurements between ultrasound and magnetic resonance imaging (MRI), to compare MRI and ultrasound-based tumour models, and to evaluate the clinical implications of these differences...
master thesis 2020
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Wang, Shuang (author)
The neuromodulation modality based on the focused ultrasonic stimulation (FUS) has gained its interests for being non-invasive while having unprecedented high spatial resolution and deep penetration. The commercially available image-guided FUS device for neuromodulation setups are normally bulky, by employing an 1-D array transducer element to...
master thesis 2020
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Dinkova, Vladislava (author)
Ultrasound imaging is a widely available and highly portable real-time, ionizing radiation-free imaging modality used as first-line in multiple areas. Conventionally, its use is focused on providing 2D imaging using ultrasound probes. However, with the introduction of matrix probes, the acquisition of 3D scans became possible enabling the...
master thesis 2020
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Sonnya Dellarosa, Sonnya (author)
Breast cancer, as one of the main causes of cancer death in the world, requires early detection to increase rate of survival. One idea is to develop a device that women could use at home to perform a regular self-check. Ultrasound is a safe, radiation-free technology that could be used for this device. Ultrasound systems (B-mode) that are...
master thesis 2020
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Teye, J. (author)
Diagnostic imaging is a fundamental requirement for the effective treatment of about 25 % of patients globally. Ultrasound imaging is considered the safest, least expensive and most convenient diagnostic imaging modality. Its widespread adoption has been in the area of 2D imaging. However, the accuracy of diagnosis with 2D ultrasound imaging is...
master thesis 2020
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Oosterveer, Timo (author)
The aim of this project was the implementation of optical coherence tomography (OCT), an invasive intracoronary imaging (ICI) tool used for the visualization of coronary arteries. The implementation was performed in a structured manner by: (1) A literature review into the current applications of OCT in relation to current standards; (2) A thesis...
master thesis 2020
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Imhoff, A.W.M. (author)
Conventional imaging techniques from medical ultrasound and seismic imaging are not suitable for multilayered domains where there is no separation between received reflection events. This happens in layered structures where the thickness of the individual layer is small with respect to the induced wavelengths. An example of these structures is...
master thesis 2020
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Kumar, Karishma (author)
Detailed imaging of blood flow may improve the understanding of brain functions. The state-of-the-art non-invasive flow imaging of the brain is limited to a one-dimensional Doppler setting. We propose a method to estimate the two-dimensional flow vector in the fine vascular network of the brain by using a speckle tracking technique. The...
master thesis 2020
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Spel, Bart (author)
Interacting with holograms is something which is widely speculated about. Combining holographic projections with haptic feedback and gesture control might bring this concept closer to reality. This project aims at exploring the possibilities of combining these three technologies into a combined virtual control system. Project owner Safran...
master thesis 2019
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Waasdorp, Rick (author)
Muscles generate force and enable movement. After excitation of a muscle the muscle fibers contract. Methods to assess muscle contraction in vivo are scarce. Electromechanical delay (EMD), defined as the time lag between muscle excitation and contraction onset, has been proposed as a measure for contraction efficiency, but provides limited...
master thesis 2019
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Ntekouli, Mado (author)
Understanding the hidden organizational principles existing in the human brain was always one of the great challenges in Neuroscience. To uncover the way the brain functions, advancements in the fields of Medical Imaging and Computational Science have been of great importance. Powerful imaging tools, such as functional magnetic resonance imaging...
master thesis 2019
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Yu, Mengxin (author)
Miniature ultrasound probes, such as intravascular ultrasound (IVUS) probes, are valuable diagnostic tools and provide image guidance during minimallyinvasive interventions. As more ultrasound transducer elements are built into such probes to improve image quality and frame rate, it becomes increasingly difficult to accommodate the cables needed...
master thesis 2019
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Saccher, Marta (author)
During the past decade, Implantable biomedical devices have emerged as an efficient treatment for neurological disorders. Among them, low-intensity focused ultrasound (LIFU) has recently gained interest due to its focusing ability, depth of penetration and reversible effects. Although the exact biophysical mechanism that leads to the interaction...
master thesis 2019
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Nagarkar, Rishabh Nitin (author)
An ASIC is presented for intra-vascular ultrasound imaging. Despite being connected via a single coaxial cable, it is able to pass arbitrary high voltage bipolar signals to the transducers for acoustic imaging. The thesis talks about the need to reduce the cable count to one and reviews the existing work in literature. It builds up on an...
master thesis 2019
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Jiang, Qiyou (author)
This work presents a low-noise amplifier (LNA) for ultrasound imaging with built-in continuous time-gain compensation (TGC), which compensates for the time-dependent attenuation of the received echo signal and thus significantly reduces its dynamic range (DR). The proposed design combines the LNA and TGC functions in a single variable-gain...
master thesis 2019
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Visser, Bram (author)
Previous work [1] has demonstrated the possibility of high resolution imaging through the use of a single element and a aberration mask. This thesis will expand on the previous work by examining the proposed method for errors in the creation of the model. The analysis is preformed by examining the various aspects of the measurements setup and...
master thesis 2019
Searched for: subject:"ultrasound"
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