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Jocker, J. (author)The influence of small- and large-scale heterogeneities on an incident wavefield was investigated in ultrasonic experiments. The field generated by conventional piezoelectric transducers was investigated separately. It was confirmed that the far-field diffraction was correctly predicted by Fraunhofer theory, but that the near-field diffraction...doctoral thesis 2005
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Tatar, F. (author)This thesis presents various aspects regarding the development of an ultrasound sensor systems for use in laparoscopic intervention. The accuracy achieved after using compensation technique for air flow disturbances or temperature variations remains in a convenient range of 200µm. Considering this high accuracy, the flexibility and the...doctoral thesis 2006
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Nakajima, Y. (author), Tamura, Y. (author), Matsumoto, Y. (author)The focused ultrasound wave attracts attention in the medical field in various applications such as High Intensity Focused Ultrasound (HIFU). Amount of sound energy is generated by focused ultrasound in the body of narrow area. Present HIFU treatment cannot be applied to the part surrounded by bones, such as brain, because focal point is changed...conference paper 2006
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Huijssen, J. (author), Verweij, M.D. (author)The design of phased array transducers for medical diagnostic ultrasound asks for an understanding of the nonlinear propagation of acoustic wavefields. Most existing numerical models are based on the linearized model equations, but in the recent decades several numerical models have been developed that incorporate weak nonlinear propagation as...conference paper 2006
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Huijssen, J. (author), Verweij, M.D. (author)The design of phased array transducers for medical diagnostic ultrasound asks for an understanding of the nonlinear propagation of acoustic wavefields. Most existing numerical models are based on the linearized model equations, but in the recent decades several numerical models have been developed that incorporate weak nonlinear propagation as...conference paper 2006
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Huijssen, J. (author)In this PhD Thesis, a numerical method is described that accurately predicts the pulsed acoustic pressure field generated by a medical diagnostic phased array transducer in a nonlinear acoustic medium. The method is called the Iterative Nonlinear Contrast Source (INCS) method, and it is capable of handling a large-scale, threedimensional domain...doctoral thesis 2008
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Lakerveld, R. (author)Crystallization is historically one of the most important separation and product formation technologies in chemical industry. The future impact of crystallization is expected to increase as new high-added value products are often in crystalline form and need to comply with increasingly stringent product quality requirements. This calls for...doctoral thesis 2010
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Kolkman, R.G.M. (author), Blomme, E. (author), Cool, T. (author), Bilcke, M. (author), Van Leeuwen, T.G. (author), Steenbergen, W. (author), Grimbergen, K.A. (author), Den Heeten, G.J. (author)The feasibility of air-coupled ultrasound transducers to detect laser-induced ultrasound from artificial blood vessels embedded in an optically scattering phantom is demonstrated. These air-coupled transducers allow new applications in biomedical photoacoustic imaging where contact with tissue is not preferred. One promising application of such...journal article 2010
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Atamanenko, T.V. (author)This thesis deals with grain refinement under the influence of ultrasonic-driven cavitation in aluminium casting processes. Three major goals of this research were: (1) to identify the mechanism of the cavitation-aided grain refinement at different stages of solidification; (2) to reveal the conditions of the stable grain refinement effect in...doctoral thesis 2010
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Carvalho, D.D.B. (author), Klein, S. (author), Akkus, Z. (author), Ten Kate, G.L. (author), Schinkel, A.F.L. (author), Bosch, J.G. (author), Van der Lugt, A. (author), Niessen, W.J. (author)Purpose The purpose of this paper is to present a methodology to estimate the carotid artery lumen centerlines in ultrasound (US) images obtained in a free-hand examination. Challenging aspects here are speckle noise in US images, artifacts, and the lack of contrast in the direction orthogonal to the US beam direction. Method An algorithm based...journal article 2011
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Girard, G. (author), Cote, S. (author), Zlatanova, S. (author), Barette, Y. (author), St-Pierre, J. (author), Van Oosterom, P.J.M. (author)Many solutions have been proposed for indoor pedestrian navigation. Some rely on pre-installed sensor networks, which offer good accuracy but are limited to areas that have been prepared for that purpose, thus requiring an expensive and possibly time-consuming process. Such methods are therefore inappropriate for navigation in emergency...journal article 2011
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Yu, Z. (author)This thesis describes the design of a front-end application-specific integrated circuit (ASIC), which will be put into the tip of a miniature ultrasound probe for 3D Trans-Esophageal Echocardiography (TEE). To enable 3D TEE, a matrix piezoelectric ultrasound transducer with more than 2000 elements will be used. Since a gastroscopic tube cannot...doctoral thesis 2012
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Sanaee, S.A. (author), Bakker, M.C.M. (author)Ultrasound imaging techniques are proposed for measuring the shape and thickness of immersed waste particles (10-20 mm size) using a linear sensor array from a fixed position. For these purposes both the front and back surface of a particle needs to be reconstructed. Raw ultrasound pulse-echo and plane wave datasets and different imaging...conference paper 2012
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Alles, E.J. (author)Intravascular ultrasound (IVUS) is a medical imaging modality aimed at imaging blood vessel walls from within the vessel. Current commercial IVUS catheters are designed to yield two-dimensional cross-sectional images perpendicular to the vessel wall. By pulling the catheter back through the artery (in the ‘axial direction’), and stacking the...doctoral thesis 2012
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Demi, L. (author)The design and optimization of medical ultrasound modalities require a method for modeling the propagation of pressure wave fields through biomedical tissue. This method needs to be capable of modeling various phenomena, e.g. nonlinear propagation, attenuation, and scattering caused by arbitrary inhomogeneities in the acoustic properties of the...doctoral thesis 2013
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Wagterveld, R.M. (author)Scaling comprises the formation of hard mineral deposits on process or membrane equipment and calcium carbonate is the most common scaling salt. Especially in reverse osmosis (RO) membrane systems, scale formation has always been a serious limitation, causing flux decline, membrane degradation, loss of production and elevated operating costs. In...doctoral thesis 2013
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Grosse, C.U. (author), Van Tittelboom, K. (author), De Belie, N. (author)To develop an appropriate method of self-healing for cementitious materials including the right composition and amount of suitable healing agents it is required to investigate the healing efficiency for certain material mixtures. While some researchers evaluate the regain in compressive strength by means of destructive load tests, this method is...conference paper 2013
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Jansen, K. (author), Wu, M. (author), Van der Steen, A.F.W. (author), Van Soest, G. (author)The presence of lipids in atherosclerotic coronary lesions is an important determinant of their potential to trigger acute coronary events. Spectroscopic intravascular photoacoustic imaging (sIVPA) has the potential to automatically detect lipids in atherosclerotic lesions. For realtime in vivo imaging, limiting the number of excitation...journal article 2013
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Sanaee, S.A. (author)This thesis is dedicated to an investigation of the potential and technological possibilities of an inline ultrasound system as a quality control system for wet recycling of solid waste. The main targeted recycling technology is magnetic density separation (MDS), a novel technique that was investigated and technologically matured in a project...doctoral thesis 2013
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Kruizinga, P. (author), Mastik, Frits (author), van den Oord, Stijn C.H. (author), Schinkel, Arend F.L. (author), Bosch, Johannes G. (author), de Jong, N. (author), van Soest, G. (author), van der Steen, A.F.W. (author)The carotid artery (CA) is central to cardiovascular research, because of the clinical relevance of CA plaques as culprits of stroke and the accessibility of the CA for cardiovascular screening. The viscoelastic state of this artery, essential for clinical evaluation, can be assessed by observing arterial deformation in response to the...journal article 2014