Abstract
A new image acquisition scheme is presented that is optimized for applications that require channel-limited transducers such as IVUS. During image acquisition, both the transmit and receive apertures are dynamically phase-encoded with a set of orthogonal (Hadamard) codes. The transducer’s excitation and data collection are handled on a single RF channel. Simulations using the Field II software package showed an 18 dB improvement in SNR when compared to a synthetic aperture technique which multiplexes elements into a single RF channel. A 30 MHz transducer with an endoscopic form-factor was fabricated and used to demonstrate data collection and image reconstruction based on this Hadamard-encoding scheme. Experimentally-reconstructed images of a wire-target showed 50 dB of dynamic range.
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