The imaging problem is also formulated for a phased array system which spotlights a target area with its transmitted beam to improve the target to clutter power ratio, and obtains beam-steered data in the receive mode for high-resolution imaging....
The interferograms obtained are then spatially heterodyne-detected on a computer to extract the signal components, that is, array data. Then, the eigenvector of the largest eigenvalue is derived by applying the power method to the array data and it is beam-steered to get images of the object...
The system is controlled by a personal computer (PC), and radio frequency echo data of each channel are transferred to the same PC via a standard USB 2.0 port for image reconstructions. Using the HFR imaging system, we have developed a new limited-diffraction array beam imaging method with ...
Array Beamforming Thomas L.Szabo, inDiagnostic Ultrasound Imaging: Inside Out (Second Edition), 2014 7.9.31.5-dimensional Arrays Intermediate between 1D and 2D arrays are 1.5-dimensional (1.5D) arrays (Tournois, Calisti, Doisy, Bureau, & Bernard, 1995; Wildes et al., 1997). This “poor ...
imaging performance of the conformable array on phantom soft matter of various shapes, with and without phase correction. The FlexArray demonstrates controllable beam steering functionality and operational pressures of > 500 kPa at the focal point, at a resonant driving frequency of ~ 1.4 ...
The key advantage is that post practicing of the complete raw data set enables any beam profile to he recreated. Additionally, this approach allows novel inspections to he performed which would he impossible with single-element transducers and impractical using the traditional phased array controller ...
The simulated data was obtained using ultrasonic field simulations and the measured data was acquired using a linear phased array imaging wire targets in water. The results show that the MMSE beamformer has superior temporal and lateral resolution compared to DAS. It is also shown that the MMSE ...
Thomas L.Szabo, inDiagnostic Ultrasound Imaging, 2004 7.1WHY ARRAYS? If, to first order, the beam pattern of an array is similar to that of a solid aperture of the same size, why bother with arrays? Arrays provide flexibility not possible with solid apertures. By the control of the delay...
(a-c) showshowanarraycanbecon guredtoproduceplane,focused, steeredbeams [2,3] .Thishighlevelof exibilityhasbeenanimportant additiontotheNDTtoolboxandhasfacilitatedawiderangeofnew inspections.Therecentdevelopmentoftwo-dimensionalarrayshas alsoledtoanincreaseinthree-dimensionalvolumetricimagingof components [...
The first electrical energy may or may not be beamformed. The transducers also may convert an echoed ultrasound wave into a second electrical energy. The analog-to-digital converter may convert the electrical energy into digital data, and the transmitter may transmit the digital data....