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- W3020909484 abstract "Because images are formed from pulse echoes, this chapter introduces time domain diffraction approaches that are suited to short pulses. The benefit of the time domain approach is that it involves a single convolution calculation with a pulse. Both time and frequency approaches are used to describe arrays that can be thought of as continuous apertures sampled along spatial coordinates. Arrays are made up of arrangements of individually addressable elements that act as imperfect samplers. For element spacing greater than the Nyquist rate, grating lobes may be formed that introduce artifacts in images. Elements also have directivity, which affects the overall ability of an array to focus and steer a beam by appropriate time delays controlled electronically. Effects of apodization and focusing on the acoustic field are explained in detail, The trade-offs of one-dimensional (1D), 1.5D, and 2D arrays are compared. Effects caused by sparse arrays and arrays with defective elements are examined. The effects of aberration and absorption on beam quality and images are discussed. Future prospects of operator-independent conformable arrays are explored." @default.
- W3020909484 created "2020-05-13" @default.
- W3020909484 creator A5049689396 @default.
- W3020909484 date "2014-01-01" @default.
- W3020909484 modified "2023-10-16" @default.
- W3020909484 title "Array Beamforming" @default.
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- W3020909484 doi "https://doi.org/10.1016/b978-0-12-396487-8.00007-0" @default.
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