Based on coherent plane-wave compounding (CPWC) and synthetic aperture sequential beamforming (SASB) we propose a two stage CPWC beamformer able to reduce the number of channels between probe and the scanner by a factor of 4 without a significant loss in image quality. Further reduction, of up to a factor of 18, is possible at the cost of a drop in contrast ratio of 2.3 dB, but lateral resolution remains almost unchanged. The propose method may be significantly simpler to implement in the probe than SASB, but it may also increase thermal noise significantly.
Alfonso Rodriguez-Molares, Hans Torp, Boris Lippe, and Lasse Løvstakken, "Sequential CPWC: from ultrafast to ultralight," Proc. SPIE 10139, Medical Imaging 2017: Ultrasonic Imaging and Tomography, 1013913 (Presented at SPIE Medical Imaging: February 17, 2017; Published: 13 March 2017); https://doi.org/10.1117/12.2255038.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon