Search Results - "Walker, William F."

Intrinsic Tradeoffs in Multi-Covariate Imaging of Sub-Resolution Targets by Morgan, Matthew R., Trahey, Gregg E., Walker, William F.

“…Multi-covariate Imaging of Sub-resolution Targets (MIST) is an estimation-based method of imaging the statistics of diffuse scattering targets. MIST estimates…”
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Quantitative Comparison of Algorithms for Tracking Single Fluorescent Particles by Cheezum, Michael K., Walker, William F., Guilford, William H.

“…Single particle tracking has seen numerous applications in biophysics, ranging from the diffusion of proteins in cell membranes to the movement of molecular…”
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Multi-covariate Imaging of Sub-resolution Targets by Morgan, Matthew R., Trahey, Gregg E., Walker, William F.

“…Conventional B-mode ultrasound imaging assumes that targets consist of collections of point scatterers. Diffraction, however, presents a fundamental limit on a…”
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Comparison of PSGL-1 Microbead and Neutrophil Rolling: Microvillus Elongation Stabilizes P-Selectin Bond Clusters by Park, Eric Y.H., Smith, McRae J., Stropp, Emily S., Snapp, Karen R., DiVietro, Jeffrey A., Walker, William F., Schmidtke, David W., Diamond, Scott L., Lawrence, Michael B.

“…A cell-scaled microbead system was used to analyze the force-dependent kinetics of P-selectin adhesive bonds independent of micromechanical properties of the…”
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MUlti-Dimensional Spline-Based Estimator (MUSE) for Motion Estimation: Algorithm Development and Initial Results by Viola, Francesco, Coe, Ryan L., Owen, Kevin, Guenther, Drake A., Walker, William F.

“…Image registration and motion estimation play central roles in many fields, including RADAR, SONAR, light microscopy, and medical imaging. Because of its…”
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Sonic Estimation of Elasticity via Resonance: A New Method of Assessing Hemostasis by Corey, F. Scott, Walker, William F.

“…Uncontrolled bleeding threatens patients undergoing major surgery and in care for traumatic injury. This paper describes a novel method of diagnosing…”
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Synthetic Aperture Focusing for Multi-Covariate Imaging of Sub-Resolution Targets by Morgan, Matthew R., Bottenus, Nick, Trahey, Gregg E., Walker, William F.

“…Coherence-based imaging methods suffer from reduced image quality outside the depth of field for focused ultrasound transmissions. Synthetic aperture methods…”
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Speckle coherence of piecewise-stationary stochastic targets by Morgan, Matthew R., Trahey, Gregg E., Walker, William F.

“…The van Cittert-Zernike (VCZ) theorem describes the propagation of spatial covariance from an incoherent source distribution, such as backscatter from…”
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Adaptive Models for Multi-Covariate Imaging of Sub-Resolution Targets (MIST) by Ahmed, Rifat, Flint, Katelyn M., Morgan, Matthew R., Trahey, Gregg E., Walker, William F.

“…Multi-covariate imaging of sub-resolution targets (MIST) is a statistical, model-based image formation technique that smooths speckles and reduces clutter…”
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A spline-based algorithm for continuous time-delay estimation using sampled data by Viola, F., Walker, W.F.

“…Time delay estimation (TDE) lies at the heart of signal processing algorithms in a broad range of application areas, including communications, coherent…”
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A comparison of the performance of time-delay estimators in medical ultrasound by Viola, F., Walker, W.F.

“…Time-delay estimation (TDE) is a common operation in ultrasound signal processing. In applications such as blood flow estimation, elastography, phase…”
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Sonorheometry assessment of platelet function in cardiopulmonary bypass patients: Correlation of blood clot stiffness with platelet integrin αIIb β3 activity, aspirin usage, and transfusion risk by Viola, Francesco, Lin-Schmidt, Xiefan, Bhamidipati, Castigliano, Haverstick, Doris M, Walker, William F, Ailawadi, Gorav, Lawrence, Michael B

“…Abstract Background Impaired platelet function may underlie bleeding associated with cardiopulmonary bypass (CPB) and at present is incompletely evaluated with…”
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Super-Resolution Image Reconstruction Using Diffuse Source Models by Ellis, Michael A, Viola, Francesco, Walker, William F

“…Abstract Image reconstruction is central to many scientific fields, from medical ultrasound and sonar to computed tomography and computer vision. Although…”
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A novel ultrasound-based method to evaluate hemostatic function of whole blood by Viola, Francesco, Mauldin, F. William, Lin-Schmidt, Xiefan, Haverstick, Doris M., Lawrence, Michael B., Walker, William F.

“…Unregulated hemostasis represents a leading cause of mortality and morbidity in the developed world. Being able to recognize and quantify defects of the…”
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Cystic resolution: A performance metric for ultrasound imaging systems by Ranganathan, K., Walker, W.F.

“…This paper describes a metric that can be used to characterize the resolution of arbitrary broadband coherent imaging systems. The metric is particularly…”
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Broadband optimal contrast resolution beamforming by Guenther, Drake A., Walker, William F.

“…► Receive beamformer architecture for broadband imaging systems using FIR filters. ► Simulation results show contrast resolution increases by as much as 20 dB…”
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Complex principal components for robust motion estimation by Mauldin, F W, Viola, F, Walker, W F

“…Bias and variance errors in motion estimation result from electronic noise, decorrelation, aliasing, and inherent algorithm limitations. Unlike most error…”
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Reduction of Echo Decorrelation via Complex Principal Component Filtering by Mauldin, F. William, Viola, Francesco, Walker, William F

“…Abstract Ultrasound motion estimation is a fundamental component of clinical and research techniques that include color flow Doppler, spectral Doppler,…”
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Robust finite impulse response beamforming applied to medical ultrasound by Guenther, D., Walker, W.

“…We previously described a beamformer architecture that replaces the single apodization weights on each receive channel with channel-unique finite impulse…”
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A method of imaging viscoelastic parameters with acoustic radiation force by Walker, W F, Fernandez, F J, Negron, L A

“…Acoustic radiation force has been proposed as a method of interrogating the mechanical properties of tissue. One simple approach applies a series of focused…”
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