Searched for: subject:"ultrasound"
(1 - 20 of 58)

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Haus, Michael (author), Ding, Y. (author), Wang, Qing (author), Toivonen, Juhani (author), Tonetto, Leonardo (author), Tarkoma, Sasu (author), Ott, Jorg (author)
The number of deployed Internet of Things (IoT) devices is steadily increasing to manage and interact with community assets of smart cities, such as transportation systems and power plants. This may lead to degraded network performance due to the growing amount of network traffic and connections generated by various IoT devices. To tackle...
conference paper 2019
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Taskin, U. (author), van der Neut, J.R. (author), Gemmeke, Hartmut (author), van Dongen, K.W.A. (author)
Whole breast ultrasound scanning systems are used to screen a women’s breast for suspicious lesions. Typically, the transducers are located at fixed positions at relatively large distances from the breast to avoid any contact with the breast. Unfortunately, these large distances give rise to large spatial domains to be imaged. These large...
journal article 2019
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Weide, Guido (author), Sloot, Lizeth (author), Oudenhoven, Laura (author), Jaspers, Richard T. (author), Harlaar, J. (author), Buizer, Annemieke (author), Bar-On, Lynn (author)
Comprehensive instrumented muscle and joint assessments should be considered when prescribing Botulinum NeuroToxin-A (BoNT-A) treatment in spastic paresis. In a child with spastic paresis, comprehensive evaluation following treatment with BoNT-A, serial casting, and physiotherapy showed that short-term improvements in gait occurred without...
journal article 2019
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Berger, Judith P. (author), Rhemrev, Johann (author), Smeets, Maddy (author), Henneman, Onno (author), English, James (author), Jansen, F.W. (author)
OBJECTIVES: To assess the added value of magnetic resonance imaging (MRI) after dynamic transvaginal ultrasound (TVUS) in the diagnostic pathway for preoperative staging of pelvic endometriosis. METHODS: A prospective observational study was conducted between April 22, 2014, and May 1, 2015. During that period, 363 patients with a clinical...
journal article 2019
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Beekers, D.I. (author), Lattwein, Kirby R. (author), Kouijzer, Joop J.P. (author), Langeveld, Simone A.G. (author), Vegter, M. (author), Beurskens, Robert (author), Mastik, F. (author), Verduyn Lunel, Rogier (author), van der Steen, A.F.W. (author), de Jong, N. (author)
Controlling microbubble-mediated drug delivery requires the underlying biological and physical mechanisms to be unraveled. To image both microbubble oscillation upon ultrasound insonification and the resulting cellular response, we developed an optical imaging system that can achieve the necessary nanosecond temporal and nanometer spatial...
journal article 2019
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van de Berg, N.J.P. (author), Sánchez-Margallo, Juan A. (author), van Dijke, A.P. (author), Langø, Thomas (author), van den Dobbelsteen, J.J. (author)
During ultrasound-guided percutaneous interventions, needle localization can be a challenge. To increase needle visibility, enhancements of both the imaging methods and the needle surface properties have been investigated. However, a methodical approach to compare potential solutions is currently unavailable. The work described here involves...
journal article 2019
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Voorneveld, J.D. (author), Engelhard, S. (author), Vos, H.J. (author), Reijnen, M. (author), Gijsen, F.J.H. (author), Versluis, M. (author), Jebbink, E. Groot (author), de Jong, N. (author), Bosch, J. G. (author)
Treatment of abdominal aortic (AA) aneurysms and stenotic lesions may be improved by analyzing their associated blood flow patterns. Angle-independent blood flow patterns in the AA can be obtained by combining echo-particle image velocimetry (ePIV) with high frame rate contrast-enhanced ultrasonography. However, ePIV performance is affected...
journal article 2018
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Janjic, Jovana (author), Tan, M. (author), Daeichin, V. (author), Noothout, E.C. (author), Chen, C. (author), Chen, Z. (author), Chang, Z.Y. (author), Beurskens, Robert H.S.H. (author), van Soest, G. (author), van der Steen, A.F.W. (author), Verweij, M.D. (author), Pertijs, M.A.P. (author), de Jong, N. (author)
Intravascular ultrasound is an imaging modality used to visualize atherosclerosis from within the inner lumen of human arteries. Complex lesions like chronic total occlusions require forward-looking intravascular ultrasound (FL-IVUS), instead of the conventional side-looking geometry. Volumetric imaging can be achieved with 2D array...
journal article 2018
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van Groeningen, T. (author), Driessen, J.N. (author), Söhl, J. (author), Voûte, R.L. (author)
When the fire brigade arrives at a burning building, it is of vital importance that people who are still inside can quickly be found. Smart buildings should be able to expose this location data to the fire brigade working in a smart city. In this paper the feasibility is researched of using ultrasonic sound sensors for human presence detection...
journal article 2018
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Tümer, N. (author), Kok, A.C. (author), Vos, F.M. (author), Streekstra, Geert J. (author), Askeland, Christian (author), Tuijthof, G.J.M. (author), Zadpoor, A.A. (author)
A rigid surface–volume registration scheme is presented in this study to register computed tomography (CT) and free-hand tracked ultrasound (US) images of the talocrural joint. Prior to registration, bone surfaces expected to be visible in US are extracted from the CT volume and bone contours in 2D US data are enhanced based on monogenic signal...
journal article 2018
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Chen, C. (author), Chen, Z. (author), Bera, Deep (author), Noothout, E.C. (author), Chang, Z.Y. (author), Tan, M. (author), Vos, H.J. (author), Bosch, Johan G. (author), Verweij, M.D. (author), de Jong, N. (author), Pertijs, M.A.P. (author)
This paper presents a front-end application-specified integrated circuit (ASIC) integrated with a 2-D PZT matrix transducer that enables in-probe digitization with acceptable power dissipation for the next-generation endoscopic and catheter-based 3-D ultrasound imaging systems. To achieve power-efficient massively parallel analog-to-digital...
journal article 2018
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Bera, D. (author), Van Den Adel, Franc (author), Radeljic-Jakic, Nikola (author), Lippe, Boris (author), Soozande, M. (author), Pertijs, M.A.P. (author), Verweij, M.D. (author), Kruizinga, P. (author), Daeichin, V. (author), Vos, H.J. (author), van der Steen, A.F.W. (author), Bosch, Johan G. (author), de Jong, N. (author)
We describe a 3-D multiline parallel beamforming scheme for real-time volumetric ultrasound imaging using a prototype matrix transesophageal echocardiography probe with diagonally diced elements and separated transmit and receive arrays. The elements in the smaller rectangular transmit array are directly wired to the ultrasound system. The...
journal article 2018
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Tan, M. (author), Chen, C. (author), Chen, Z. (author), Janjic, Jovana (author), Daeichin, V. (author), Chang, Z.Y. (author), Noothout, E.C. (author), van Soest, G. (author), Verweij, M.D. (author), de Jong, N. (author), Pertijs, M.A.P. (author)
This paper presents an area- and power-efficient application-specified integrated circuit (ASIC) for 3-D forward-looking intravascular ultrasound imaging. The ASIC is intended to be mounted at the tip of a catheter, and has a circular active area with a diameter of 1.5 mm on the top of which a 2-D array of piezoelectric transducer elements is...
journal article 2018
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Massaad Mouawad, J.M. (author), van Neer, P.L.M.J. (author), van Willigen, D.M. (author), de Jong, N. (author), Pertijs, M.A.P. (author), Verweij, M.D. (author)
Typically, ultrasonic flow meters assume linear wave propagation. Nevertheless, if the transducers of an ultrasonic flow sensor excite a pressure wave with a high amplitude, nonlinear wave propagation effects become significant. The appearance of higher harmonics increases the bandwidth of the received signal, which may potentially lead to a...
conference paper 2018
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Fool, F. (author), de Wit, J. (author), Vos, H.J. (author), Bera, D. (author), de Jong, N. (author), Verweij, M.D. (author)
The huge amount of data that needs to be transferred between probe and imaging system becomes a major issue when the data transfer capacity is limited, e.g. in handheld systems, wireless probes and miniaturized probes. The amount of data can be significantly reduced by using two-stage beamforming. The first stage consists of a fixed focus...
conference paper 2018
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Kang, E. (author), Ding, Q. (author), Shabanimotlagh, M. (author), Kruizinga, P. (author), Chang, Z.Y. (author), Noothout, E.C. (author), Vos, H.J. (author), Bosch, J.W. (author), Verweij, M.D. (author), de Jong, N. (author), Pertijs, M.A.P. (author)
This paper presents an ultrasound transceiver application-specific integrated circuit (ASIC) designed for 3-D ultrasonic imaging of the carotid artery. This application calls for an array of thousands of ultrasonic transducer elements, far exceeding the number of channels of conventional imaging systems. The 3.6 x 6.8 mm² ASIC...
journal article 2018
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van Groenestijn, Gert Jan (author), Meulendijks, Nicole (author), van Ee, Renz (author), Volker, Arno (author), van Neer, P.L.M.J. (author), Buskens, Pascal (author), Julien, Cédric (author), Verheijen, Marcel (author)
Both in design and production of nanoparticles and nanocomposites it is of vital importance to have information about their size and concentration. During the formation of nanoparticles, real-time monitoring of particle size and concentration during bottom-up synthesis in liquids allows for a detailed study of nucleation and growth. This...
journal article 2018
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Beekers, D.I. (author), van Rooij, Tom (author), van der Steen, A.F.W. (author), de Jong, N. (author), Verweij, M.D. (author), Kooiman, Klazina (author)
Ultrasound contrast agents consist of gas-filled coated microbubbles that oscillate upon ultrasound insonification. Their characteristic oscillatory response provides contrast enhancement for imaging and has the potential to locally enhance drug delivery. Since microbubble response depends on the local acoustic pressure, an ultrasound...
journal article 2018
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Taskin, U. (author), Ozmen, Neslihan (author), Gemmeke, Hartmut (author), van Dongen, K.W.A. (author)
To design breast ultrasound scanning systems or to test new imaging methods, various computer models are used to simulate the acoustic wave field propagation through a breast. The computer models vary in complexity depending on the applied approximations. The objective of this paper is to investigate how the applied approximations affect the...
journal article 2018
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Tacchetti, Lucia (author), Serdijn, W.A. (author), Giagka, V. (author)
This paper presents the design of a neurostimulator performing biphasic ultra-high-frequency electrical stimulation while being driven from ultrasound energy. Unlike conventional constant current or constant voltage stimulators or state-of-the-art ultra-high-frequency stimulators, the system does not convert the input AC signal into regulated...
conference paper 2018
Searched for: subject:"ultrasound"
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