Seth D. Silverstein

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Incoherent averaging of measurements made at different look directions can be used to reduce speckle noise in medical ultrasound images. An analytic expression for the correlation between two measurements made at different spatial positions is derived. Using this expression, the optimum aperture displacement for efficient incoherent averaging (i.e.(More)
This work describes an algorithm called the control circuit encoding (CCE) algorithm that is e ective for the remote calibration of anNe element active phased array antenna. The algorithm involves transmission of orthogonal encoded signals. CCE is ideally suited for analog beamformers as it requires no additional encoding hardware. The CCE method encodes(More)
A microscopic scattering model is developed to expedite simulation studies of ultrasound imaging in soft tissue using multichannel transducer probes. The model fully accounts for the physics of broadband signals, propagating wave packets, and time delay focusing. Analytical results are presented for 2-D transducer arrays; 1-D results can be trivially(More)
Obtaining high quality ultrasound images at high frame rates has great medical importance, especially in applications in which tissue motion is significant (e.g., the beating heart). Dynamic focus and dynamic aperture can improve image quality significantly, and they have been implemented on the receive beam in state-of-the-art medical ultrasound systems.(More)