• Publications
  • Influence
Synthetic aperture imaging for small scale systems
Multi-element synthetic aperture imaging methods suitable for applications with severe cost and size limitations are explored. Array apertures are synthesized using an active multi-element receiveExpand
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Coded excitation system for improving the penetration of real-time phased-array imaging systems
  • M. O’Donnell
  • Engineering, Medicine
  • IEEE Transactions on Ultrasonics, Ferroelectrics…
  • 1992
Based on an analysis of the inherent signal-to-noise ratio (SNR) in medical ultrasound imaging, SNR improvements of 15-20 dB are theoretically possible for real-time phased-array imagers using codedExpand
  • 373
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Optimizing the radiation pattern of sparse periodic linear arrays
We have developed a method for designing sparse periodic arrays. Grating lobes in the two-way radiation pattern are avoided by using different element spacings on transmission and reception. TheExpand
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  • 12
Comparison of linear and circular polarization for magnetic resonance imaging
Abstract A comparison of experimental imaging results obtained with linearly polarized and circularly polarized radiofrequency excitation and reception is presented. Simulation images in goodExpand
  • 235
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  • PDF
Phase-aberration correction using signals from point reflectors and diffuse scatterers: basic principles
Methods for correction of phase aberrations induced by near-field variations in the index of refraction are explored. Using signals obtained from a sampled aperture (i.e. transducer array), phaseExpand
  • 454
  • 10
Delta-sigma oversampled ultrasound beamformer with dynamic delays
The principles of oversampling are exploited in a simple beamforming architecture using a single bit delta-sigma (/spl Delta/C) analog to digital converter (A/D) on every channel. The high samplingExpand
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NMR blood flow imaging using multiecho, phase contrast sequences.
Moving nuclei, in contrast to stationary nuclei, experience a phase shift in the presence of a balanced gradient. Monitoring of this phase shift can be used to measure the flow velocity of movingExpand
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Efficient synthetic aperture imaging from a circular aperture with possible application to catheter-based imaging
Phased-array imaging, including complete dynamic focus, is explored for imaging using a circular aperture. Based on the constraints of catheter-based systems, an efficient synthetic aperture methodExpand
  • 160
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Phase-aberration correction using signals from point reflectors and diffuse scatterers: measurements
A method for phase-aberration correction of phased-array images is tested using a model of near-field velocity inhomogeneities. A set of grooved room-temperature vulcanizing plates was constructed toExpand
  • 234
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Ultrasound Current Source Density Imaging
We propose ultrasound current source density imaging (UCSDI), a direct 3-D imaging technique that potentially facilitates existing mapping procedures with superior spatial resolution. Expand
  • 60
  • 5