Devices, systems, and methods for ultrasonically acquiring far-field and near-field images within a body are disclosed. An ultrasound imaging device adapted for insertion within a body includes a first ultrasonic sensor configured to transmit ultrasonic waves at a first frequency for acquiring far-...
A parametric speaker is a device for generating and focusing highly directional sound beams. It is essentially a by-product that comes with the nonlinearity of ultrasound. It is noteworthy that this directional beam was controlled and utilized mostly for far-field applications in the past. We empi...
The simulation of a novel drone-based near-field (NF)/far-field (FF) antenna measurement system enabling the reconstruction of Antenna Under Test (AUT) pha... CG Parini,SF Gregson,AK Brown - 《Iet Microwaves Antennas & Propagation》 被引量: 0发表: 2022年 New phased array models for fast...
Beyond the Rayleigh Criterion: Grating Assisted Far-Field Optical Diffraction Tomography We propose an optical imaging system, in which both illumination and collection are done in far field, that presents a power of resolution better than one-... A Sentenac,PC Chaumet,K Belkebir - 《Physical Re...
Time-Domain Optimized Near-Field Estimator for Ultrasound Imaging: Initial Development and Results For nearly four decades, adaptive beamforming (ABF) algorithms have been applied in RADAR and SONAR signal processing. These algorithms reduce the contribu... F Viola,MA Ellis,WF Walker - 《IEEE Tran...
Researchers at the University of Toronto have developed a new distance-mapping principle that delivers automatic real-time focus of both near- and far-field images, simultaneously and in high resolution. Called the Omni-focus Video Camera, it is described as a “breakthrough in video camera ...
(CT) and positron emission tomography (PET), have been used for detecting thrombus-related diseases, especially the extensively developed thrombus in the clinical field12,13. However, such imaging modalities share the drawbacks of weak functional signal, suboptimal spatial resolution, time-consuming ...
The formation of an occlusive thrombus in the blood vessel is the main culprit for numerous life-threatening cardiovascular diseases that represent the leading cause of morbidity and mortality worldwide. Herein, we develop a polymer nanoplatform that integrates long-wavelength second near-infrared (NIR...
g The numerical simulation conforming the bouncing bubble and revealing the related velocity field. The white dash line for the location of TIL. The error bars of the data in (e–f) denote the standard deviation of at least three measurements. Source data are provided as a Source Data file...
The IR function can become very peaked (i.e. containing discontinuities) in particular in the far field of the transducer. As a result, in order to evaluate the IR function numerically, high sampling frequencies are required increasing calculation time and making data handling more cumbersome. How...