【摘 要】
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Background, Motivation and Objective Recently we introduced top orthogonal to bottom electrode 2D CMUT arrays with novel bias-sensitive 3D imaging capabilities. Two imaging schemes were presented usin
【机 构】
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Electrical & Computer Engineering, University of Alberta, Edmonton, Alberta, Canada
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Background, Motivation and Objective Recently we introduced top orthogonal to bottom electrode 2D CMUT arrays with novel bias-sensitive 3D imaging capabilities. Two imaging schemes were presented using such arrays: Scheme 1 involved transmitting on a column and receiving along all rows in parallel. Rectilinear retrospective beamforming produces a volumetric image with one-way x-focusing and one-way y-focusing. Scheme 2 involved biasing a column to effectively create dominant element sensitivity on one linear array which could then be scanned by switching the biasing pattern. Retrospective beamforming produced one-way focusing in the x-z plane, yet with 2-way (transmit-and-receive) focusing in the y-z plane. Scheme 1 has considerable practical significance due to fast imaging speeds but may be SNR-limited owing to limited transmitting area for each transmit event. Scheme 2 likewise has limited dominant element transmitting area and hence limited SNR. We introduce new aperture encoding schemes that improve SNR over Scheme 1 and 2 without any frame-rate degradation.
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