Searched for: subject%3A%22ultrasound%22
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Wilgenburg, Gert (author)
The use of non-destructive tests for assessing the material status of concrete structures in the Netherlands remains relatively uncommon, despite the growing demand for the preservation of existing structures under the VenR policy of Rijkswaterstaat. Skepticism towards NDTs is reflected in the scarcity of documented case studies in publicly...
master thesis 2024
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van Eijk, Casper (author)
This thesis presents the design and experimental evaluation of an in-line, active ultrasound, condition monitoring setup for the detection of contamination in offshore bearing grease. This process is divided into three distinct research steps. First of all, the influences that affect ultrasound propagation through a bearing grease sample have...
master thesis 2024
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Li, J. (author)
Around 10% of the population will have to go through a catheterization procedure for the treatment of a cardiovascular disease at a certain stage of their lives. During such a procedure, smart catheters will be the "eyes and ears" of the surgeons, significantly improving the diagnosis and treatment. However, there have been very limited...
doctoral thesis 2024
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Kawasaki, S. (author)
CMUTs (Capacitive Micromachined Ultrasonic Transducers) are causing a technological revolution. Research over the last decade showed that CMUTs can sufficiently replace traditional ultrasound technology based on the bulk PZT, along with other benefits such as lower assembly cost, broader bandwidth and monolithic integration capability with ASICs...
doctoral thesis 2024
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Niemantsverdriet, Ruben (author)
The periconceptional period, encompassing the embryonic phase, is a critical window where a majority of reproductive failures, pregnancy complications, and adverse pregnancy outcomes arise. The Carnegie staging system comprises 23 stages which are based on embryonic morphological development. This allows for the assessment of normal and abnormal...
master thesis 2024
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Wemelsfelder, Tom (author)
In recent years, many therapeutic applications for medical ultrasound have arisen, such as ablation of tumors, breaking up kidney stones, and neuromodulation. To localize the target area, often ultrasound imaging methods are used. Conventionally, a different transducer array is used for imaging and therapeutic applications because of their...
master thesis 2024
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Moisello, Elisabetta (author), Novaresi, Lara (author), Eshani Sarkar, E. (author), Malcovati, Piero (author), Lopes Marta da Costa, T.M. (author), Bonizzoni, Edoardo (author)
Piezoelectric Micromachined Ultrasonic Transducers (PMUT) and Capacitive Micromachined Ultrasonic Transducers (CMUT) have seen great developments in recent years, both in terms of performance and scope of applications within the biomedical ultrasound domain. This paper presents a review of the state-of-the-art of PMUT and CMUT technologies,...
review 2024
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Eenkhoorn, C. (author), Goos, T.G. (author), Dankelman, J. (author), Franx, Arie (author), Eggink, Alex J. (author)
Introduction: In clinical practice, fetal heart rate monitoring is performed intermittently using Doppler ultrasound, typically for 30 minutes. In case of a non-reassuring heart rate pattern, monitoring is usually prolonged. Noninvasive fetal electrocardiography may be more suitable for prolonged monitoring due to improved patient comfort and...
journal article 2024
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Simoes dos Santos, D. (author), Ossenkoppele, B.W. (author), Hopf, Y.M. (author), Soozande, Mehdi (author), Noothout, E.C. (author), Vos, H.J. (author), Bosch, Johan G. (author), Pertijs, M.A.P. (author), Verweij, M.D. (author), de Jong, N. (author)
Objective: Described here is the development of an ultrasound matrix transducer prototype for high-frame-rate 3-D intra-cardiac echocardiography. Methods: The matrix array consists of 16 × 18 lead zirconate titanate elements with a pitch of 160 µm × 160 µm built on top of an application-specific integrated circuit that generates transmission...
journal article 2024
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Kortenbout, A.J. (author), Costerus, Sophie (author), Dudink, Jeroen (author), de Jong, N. (author), de Graaff, Jurgen C. (author), Vos, H.J. (author), Bosch, Johan G. (author)
Objective: Post-operative brain injury in neonates may result from disturbed cerebral perfusion, but accurate peri-operative monitoring is lacking. High-frame-rate (HFR) cerebral ultrasound could visualize and quantify flow in all detectable vessels using spectral Doppler; however, automated quantification in small vessels is challenging...
journal article 2024
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Simoes dos Santos, D. (author), Baldini, L.B. (author), Vos, H.J. (author), Verweij, M.D. (author), de Jong, N. (author), van Neer, P.L.M.J. (author)
The accurate determination of the transfer function of ultrasound transducers is important for their design and operational performance. However, conventional methods for quantifying the transfer function, such as hydrophone measurements, radiation force balance, and pulse-echo measurements, are costly and complex due to specialized equipment...
journal article 2024
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Zhu, P. (author), Simón Grau, I. (author), Kokalari, I. (author), Kohane, Daniel S. (author), Rwei, A.Y. (author)
Ultrasound is a promising technology to address challenges in drug delivery, including limited drug penetration across physiological barriers and ineffective targeting. Here we provide an overview of the significant advances made in recent years in overcoming technical and pharmacological barriers using ultrasound-assisted drug delivery to...
review 2024
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Hopf, Y.M. (author), Simoes dos Santos, D. (author), Ossenkoppele, Boudewine W. (author), Noothout, E.C. (author), Chang, Z.Y. (author), Chen, Chao (author), Vos, H.J. (author), Verweij, M.D. (author), de Jong, N. (author), Pertijs, M.A.P. (author)
This article presents an application-specific integrated circuit (ASIC) for catheter-based 3-D ultrasound imaging probes. The pitch-matched design implements a comprehensive architecture with high-voltage (HV) transmitters, analog front ends, hybrid beamforming analog-To-digital converters (ADCs), and data transmission to the imaging system....
journal article 2024
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Smith, Caitlin (author), Shepherd, Jami (author), Renaud, G.G.J. (author), van Wijk, Kasper (author)
We present a technique called photoacoustic vector-flow (PAVF) to quantify the speed and direction of flowing optical absorbers at each pixel from acoustic-resolution PA images. By varying the receiving angle at each pixel in post-processing, we obtain multiple estimates of the phase difference between consecutive frames. These are used to...
journal article 2024
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Boertje, Puck (author)
With today’s aging population and the prevalence of chronic illnesses, healthcare systems worldwide are struggling to accommodate the increasing number of patients. This projected growth and rising demand underscore the importance of advancing wearable devices. In the realm of diagnostic healthcare, the pursuit of non-invasive and safe...
master thesis 2023
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Zhang, Yihao (author)
Ultrasound (US) neuromodulation is a widely-used technique in the field of neuroscience and medical therapy that uses ultrasound waves to non-invasively modulate neural activity. The miniaturization of modern ultrasonic systems has an intimate relation with system power consumption. As the advancement of Integrated Circuits (ICs) represents a...
master thesis 2023
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Bellouki, Imad (author)
This work presents an ASIC designed for portable (wearable) ultrasound (US) imaging systems. The ASIC employs a new type of energy-efficient high-voltage (HV) transmit pulser able to generate pulses up to 30V directly from a low-voltage battery supply to excite an ultrasound transducer. HV operation is a necessity in US imaging transceiver...
master thesis 2023
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Jiang, Haitao (author)
The technique of ultrasound-guided needle insertion is commonly employed in various clinical fields, including biopsy, anesthesia, brachytherapy, and ablation. However, the visibility of the needle in ultrasound (US) images remains a persistent challenge. To improve the guidance accuracy of needle insertion during interventions, it is crucial to...
master thesis 2023
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LEI, Yuan (author)
Acoustoelectric imaging is an emerging technology confirmed by in-vivo experiments that can help diagnose and evaluate peripheral nerve neuropathy. The ultrasound transmitter (TX) is required in such systems to selectively focus and apply acoustic pressure on the target volume. Within the ultrasound TX, the power amplifier (PA, commonly called...
master thesis 2023
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Liu, Tianyi (author)
Transcranial Doppler ultrasound imaging is a crucial tool for both clinical and research applications. Despite its significance, its utility is constrained by the dynamic range limitations of the receiver system. Traditional methods, relying on high-dynamic-range front-end amplifiers and high-resolution ADCs, are often inefficient. These methods...
master thesis 2023
Searched for: subject%3A%22ultrasound%22
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