The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Focused ultrasound can effectively treat tumors by thermal ablation, but treatment times associated with mechanical or electronic scanning of single foci can be prohibitively long. Maximizing the energy efficiency of focused ultrasound ablation may decrease treatment time while also decreasing sensitivity to perfusion. One proposed approach [Mast et al., US Patent 9132287, 2015] creates multiple foci...
Fast cardiac imaging requires a reduction of the number of transmit events. This is typically achieved through multi-line-transmission (MLT) and/or multi-line-acquisition (MLA) techniques. However, restricting the field-of-view (FOV) to the anatomically relevant domain, e.g. the myocardium, can increase frame rate (FR) further. Using computer simulations, we previously proposed an anatomical scan...
For several use cases of complex processing algorithms on ultrasound NDT data, it is mandatory to ensure real-time signal processing speed. This can be achieved by using e.g. a field programmable gate array (FPGA). Sparse signal recovery (SSR) and compressed sensing (CS) methods are used for superior reconstruction of flaws from compressed measurement data. SSR and CS are currently a hot research...
Tissue Doppler Imaging (TDI) is an excellent tool for early detection of myocardial dysfunction, as well as for prognosis and follow-up of the myocardial function after surgical treatment. However, since it exploits the same principles of color flow imaging, TDI requires to balance frame rate with field of view. A novel TDI technique based on multiline transmission (MLT), i.e. the simultaneous transmission...
Bulk thermal ablation, including radiofrequency ablation (RFA) as well as microwave and ultrasound (US) ablation, is an important approach to tumor treatment. To avoid incomplete treatments and cancer recurrence while reducing morbidity, a real-time monitoring and control approach, capable of providing consistent thermal ablation in minimum time, is needed. Echo decorrelation imaging has been successfully...
Achieving a high frame rate in echocardiography is highly important for quantifying the short phases of the cardiac cycle that contain valuable information for medical diagnosis. Additionally, the 3D quantitative assessment of the heart would significantly improve the current measurements used in daily clinical routine. Nevertheless, obtaining ultrafast images remains a challenge due to the trade-off...
In a few years, ultrasound research platforms, also known as open scanners, have become a great tool for facilitating the experimental activities of ultrasound labs. An ideal platform should be easily programmed to permit the transmission of arbitrary sequences of arbitrary waveforms, the acquisition of huge amounts of raw echo-data, the visualization of the region of interest and, possibly, the real-time...
A great need exists to non-invasively quantify the neurotransmitter activity in real-time to build a comprehensive functional map of a brain. In this paper, we present real-time recording of neuronal membrane potential change in vivo using transcranial photoacoustic (PA) voltage-sensitive dye (VSD) imaging on a rat in seizure.
A dual beam vector Doppler method was proposed (DOI: 10.1016/j.ultrasmedbio.2009.11.004), in which one beam is continuously tracked perpendicular to the flow direction, and the second one is used to perform velocity measurements with known Doppler angle. Since two consecutive transmission (TX) and reception (RX) events (one for each beam) are needed, the effective Doppler pulse repetition frequency...
Pressure measurements within the chambers of the heart yield critical information for diagnosis and management of cardiac patients (∼92 million Americans), but cardiac catheterization procedure is invasive and expensive. Subharmonic aided pressure estimation (SHAPE) may be able to estimate intra-cardiac pressures noninvasively, if the optimum incident acoustic output (IAO) for SHAPE can be established...
Eigen-filters with attenuation response adapted to clutter statistics in color flow imaging (CFI) have shown improved flow detection sensitivity in the presence of tissue motion. However, its practical adoption for routine use in clinical scanners is hindered by the long processing time required to derive the eigen-components. In this work, we seek to overcome this issue by formulating a parallel-computing...
Vector Doppler techniques are ready to substituting the standard methods for blood velocity investigation. However, like in classic Pulse Wave methods, the maximum detectable velocity is related to the Pulse Repetition Frequency (PRF), which is limited by the maximum depth and/or hardware constraints. Unfortunately, the blood velocity, e.g. in stenotic vessels, can easily peak at 2m/s, thus resulting...
Most commercially available ultrasound imaging systems currently implement the delay and sum (DAS) beamforming. Alternative beamformers have been presented, offering higher performance at the expense of computational complexity, which has so far limited their actual implementation. In particular, the Filtered-Delay Multiply and Sum (F-DMAS) beamformer, which adds the computation of signed square roots,...
Solid tumor hypoxia is a poor outcome predictor for radiotherapy, chemotherapy and also surgical treatment options. Recently, oxygen microbubbles (OMB) have shown promise as an adjuvant therapy to relieve such tumor hypoxia. However, a key limiting factor remains the lack of available data in vivo of the dose-response and time-dynamics of this OMB-induced reoxygenation. Here we study the kinetics...
Echocardiograms are acquired from standard views to ensure correct assessment of cardiac function. There is an increasing use of quantitative tools where specific views are required. Further, non-expert users of echocardiography are increasing, and thus a need for quality assurance during imaging. The aim of this project is to develop automatic and robust real-time classification of cardiac views...
A real-time ultrasound (US) coagulation monitoring for coagulation based on acoustic radiation force is described. US imaging to facilitate HIFU has advantages with respect to portability, cost effectiveness and spatiotemporal resolution. Localized motion imaging (LMI) is one of the techniques based on US to detect a change of tissue mechanical properties caused by its thermal coagulation. To achieve...
Elastography plays a key role in characterizing soft tissue. Although it has found widespread use in clinical diagnostics, nearly all methods require direct physical contact with tissue and can even be invasive. However, for a number of applications (ophthalmic, for instance) physical contact is not desired and may not even be allowed. Recently, we proposed a fundamentally new approach to 4-D dynamic...
The last decade has seen an extraordinary evolution of vector Doppler techniques, allowing the investigation of full 2D regions of interest (ROI). In particular, we recently proposed a method (DOI: 10.1109/ULTSYM.2016.7728428), which transmits plane waves (PWs), beamforms 8 parallel lines distributed over the ROI, and estimates the flow speed in real-time by using 16 independent sub-apertures in reception...
Current commercial matrix transducers for 3D Dynamic Contrast-Enhanced Ultrasound (3D DCE-US) do not display side-by-side B-mode and contrast-mode images, thus leaving the operator with no position feedback during lengthy acquisitions. The purpose of this study was to demonstrate the feasibility of using tracking to provide positioning feedback and to assess resulting improvements in maintaining imaging...
Identifying real-time changes in tissues via quantitative ultrasound (QUS) approaches are clinically significant, particularly if QUS changes correspond to early detection of disease or provide early assessment of treatment success. Thus, understanding sequential steps in disease progression is key for success. Cerulein-induced inflammation of the pancreas (pancreatitis) in rodent models causes a...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.