William F Walker

Education

• B.S.E. Duke University, 1990
• Ph.D. Duke University, 1995

Positions

• Executive in Residence in the Pratt School of Engineering
• Core Faculty in Innovation & Entrepreneurship

Courses Taught

• EGR 79S: Thrive

Publications

• Ahmed R, Flint KM, Morgan MR, Trahey GE, Walker WF. Adaptive Models for Multi-Covariate Imaging of Sub-Resolution Targets (MIST). IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2022 Jul;69(7):2303–17.
• Morgan MR, Trahey GE, Walker WF. Intrinsic Tradeoffs in Multi-Covariate Imaging of Sub-Resolution Targets. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2020 Oct;67(10):1980–92.
• Morgan MR, Bottenus N, Trahey GE, Walker WF. Synthetic Aperture Focusing for Multi-Covariate Imaging of Sub-Resolution Targets. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2020 Jun;67(6):1166–77.
• Morgan MR, Trahey GE, Walker WF. Speckle coherence of piecewise-stationary stochastic targets. The Journal of the Acoustical Society of America. 2019 Sep;146(3):1721.
• Morgan MR, Trahey GE, Walker WF. Multi-covariate Imaging of Sub-resolution Targets. IEEE transactions on medical imaging. 2019 Jul;38(7):1690–700.
• Corey FS, Walker WF. Sonic Estimation of Elasticity via Resonance: A New Method of Assessing Hemostasis. Annals of biomedical engineering. 2016 May;44(5):1405–24.
• Viola F, Lin-Schmidt X, Bhamidipati C, Haverstick DM, Walker WF, Ailawadi G, et al. Sonorheometry assessment of platelet function in cardiopulmonary bypass patients: Correlation of blood clot stiffness with platelet integrin αIIbβ3 activity, aspirin usage, and transfusion risk. Thrombosis research. 2016 Feb;138:96–102.
• Corey FS, Walker WF. Sonic Estimation of Elasticity via Resonance (SEER). In: 2015 IEEE International Ultrasonics Symposium, IUS 2015. 2015.
• Durst C, Monteith S, Sheehan J, Moldovan K, Snell J, Eames M, et al. Optimal imaging of in vitro clot sonothrombolysis by MR-guided focused ultrasound. Journal of neuroimaging : official journal of the American Society of Neuroimaging. 2013 Apr;23(2):187–91.
• Lawrence MB, Lin-Schmidt X, Viola F, Ailawadi G, Walker WF. Sonorheometry assessment of aspirin effects on platelet contributions to blood clot stiffness ex vivo in patients undergoing cardiopulmonary bypass procedures. In: JOURNAL OF THROMBOSIS AND HAEMOSTASIS. 2013. p. 511–511.
• Guenther DA, Walker WF. Broadband optimal contrast resolution beamforming. Ultrasonics. 2012 Mar;52(3):387–401.
• Mauldin FW, Viola F, Walker WF. Complex principal components for robust motion estimation. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2010 Nov;57(11):2437–49.
• Ellis MA, Viola F, Walker WF. Super-resolution image reconstruction using diffuse source models. Ultrasound in medicine & biology. 2010 Jun;36(6):967–77.
• Mauldin FW, Viola F, Hamer TC, Ahmed EM, Crawford SB, Haverstick DM, et al. Adaptive force sonorheometry for assessment of whole blood coagulation. Clinica chimica acta; international journal of clinical chemistry. 2010 May;411(9–10):638–44.
• Viola F, Mauldin FW, Lin-Schmidt X, Haverstick DM, Lawrence MB, Walker WF. A novel ultrasound-based method to evaluate hemostatic function of whole blood. Clinica chimica acta; international journal of clinical chemistry. 2010 Jan;411(1–2):106–13.
• Mauldin FW, Viola F, Walker WF. Reduction of echo decorrelation via complex principal component filtering. Ultrasound in medicine & biology. 2009 Aug;35(8):1325–43.
• Guenther DA, Walker WF. Robust finite impulse response beamforming applied to medical ultrasound. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2009 Jun;56(6):1168–88.
• Guenther DA, Walker WF. A method for accurate in silico modeling of ultrasound transducer arrays. Ultrasonics. 2009 May;49(4–5):404–12.
• Fuller MI, Owen K, Blalock TN, Hossack JA, Walker WF. Real time imaging with the sonic window: A pocket-sized, C-scan, medical ultrasound device. In: Proceedings - IEEE Ultrasonics Symposium. 2009. p. 196–9.
• Mauldin FW, Viola F, Walker WF. Robust motion estimation using complex principal components. In: Proceedings - IEEE Ultrasonics Symposium. 2009. p. 2429–32.
• Ellis MA, Walker WF. Super-resolution image reconstruction with reduced computational complexity. In: Proceedings - IEEE Ultrasonics Symposium. 2009. p. 2351–4.
• Guenther DA, Walker WF. Generalized cystic resolution: a metric for assessing the fundamental limits on beamformer performance. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2009 Jan;56(1):77–90.
• Mauldin FW, Viola F, Lin-Schmidt X, Lawrence MB, Walker WF. Adaptive radiation force ultrasound for monitoring hemostasis in whole blood. In: Proceedings - IEEE Ultrasonics Symposium. 2009. p. 173–6.
• Ellis MA, Walker WF. Reduced rank formulation for increased computational efficiency in medical ultrasound model-based beamforming. In: Conference Record - Asilomar Conference on Signals, Systems and Computers. 2008. p. 1923–6.
• Viola F, Coe RL, Owen K, Guenther DA, Walker WF. MUlti-Dimensional Spline-Based Estimator (MUSE) for motion estimation: algorithm development and initial results. Annals of biomedical engineering. 2008 Dec;36(12):1942–60.
• Viola F, Walker WF. Computationally efficient spline-based time delay estimation. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2008 Sep;55(9):2084–91.
• Owen K, Guenther DA, Walker WF. Beamformer enhancement by post-processing for improved spatial resolution and signal-to-noise ratio. In: Progress in Biomedical Optics and Imaging - Proceedings of SPIE. 2008.
• Fuller MI, Ranganathan K, Zhou S, Blalock TN, Hossack JA, Walker WF. Experimental system prototype of a portable, low-cost, C-scan ultrasound imaging device. IEEE transactions on bio-medical engineering. 2008 Feb;55(2 Pt 1):519–30.
• Viola F, Ellis MA, Walker WF. Time-domain optimized near-field estimator for ultrasound imaging: initial development and results. IEEE transactions on medical imaging. 2008 Jan;27(1):99–110.
• Guenther DA, Walker WF. Optimal contrast resolution beamforming. In: Proceedings - IEEE Ultrasonics Symposium. 2007. p. 37–41.
• Owen K, Walker WF. Novel method for design and fabrication of single piston transducers for extended depth of field. In: Proceedings - IEEE Ultrasonics Symposium. 2007. p. 793–6.
• Ellis MA, Viola F, Walker WF. Diffuse targets for improved contrast in beamforming adapted to target. In: Proceedings - IEEE Ultrasonics Symposium. 2007. p. 216–9.
• Viola F, William Mauldin F, Tropello SP, Gail Macik B, Lawrence MB, Walker WF. Sonorheometry: A new method for assessing coagulation potential. In: Proceedings - IEEE Ultrasonics Symposium. 2007. p. 1001–4.
• Viola F, Guenther DA, Coe RL, Walker WF. Multi-dimensional spline-based non-rigid image registration. In: Progress in Biomedical Optics and Imaging - Proceedings of SPIE. 2007.
• Ellis MA, Guenther D, Walker WF. A spline-based approach for computing spatial impulse responses. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2007 May;54(5):1045–54.
• Ranganathan K, Walker WF. Cystic resolution: a performance metric for ultrasound imaging systems. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2007 Apr;54(4):782–92.
• Guenther DA, Walker WF. Optimal apodization design for medical ultrasound using constrained least squares part I: theory. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2007 Feb;54(2):332–42.
• Guenther DA, Walker WF. Optimal apodization design for medical ultrasound using constrained least squares part II: simulation results. In: IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2007. p. 343–58.
• Fuller MI, Blalock TN, Hossack JA, Walker WF. Novel transmit protection scheme for ultrasound systems. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2007 Jan;54(1):79–86.
• Guenther DA, Walker WF. Receive channel FIR filters for enhanced contrast in medical ultrasound. In: Progress in Biomedical Optics and Imaging - Proceedings of SPIE. 2007.
• Ellis MA, Walker WF. Piecewise-linear approximation for improved accuracy in near-field ultrasound simulation. In: Proceedings - IEEE Ultrasonics Symposium. 2006. p. 1698–701.
• Walker WF, Guenther DA, Coe RL, Viola F. A novel spline-based algorithm for multidimensional displacement and strain estimation. In: Proceedings - IEEE Ultrasonics Symposium. 2006. p. 1221–5.
• Viola F, Ellis MA, Walker WF. Near-field, broadband adaptive beamforming for ultrasound imaging. In: Conference Record - Asilomar Conference on Signals, Systems and Computers. 2006. p. 1543–7.
• Viola F, Ellis MA, Walker WF. Ultrasound imaging with beamforming adapted to target. In: Proceedings - IEEE Ultrasonics Symposium. 2006. p. 128–31.
• Walker WF, Fuller MI, Brush EV, Eames MDC, Owen K, Ranganathan K, et al. The Sonic Window: Second generation results. In: Progress in Biomedical Optics and Imaging - Proceedings of SPIE. 2006.
• Viola F, Walker WF. A comparison between spline-based and phase-domain time-delay estimators. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2006 Mar;53(3):515–7.
• Santy MK, Blalock TN, Walker WF. Design and evaluation of a PC card for acoustic radiation force based mechanical characterization. In: Proceedings - IEEE Ultrasonics Symposium. 2005. p. 1428–30.
• Viola F, Walker WF. Adaptive signal processing in medical ultrasound beamforming. In: Proceedings - IEEE Ultrasonics Symposium. 2005. p. 1980–3.
• Ranganathan K, Guenther DA, Walker WF. Design of apodization profiles using a cystic resolution metric for ultrasound. In: Proceedings - IEEE Ultrasonics Symposium. 2005. p. 1207–10.
• Fuller MI, Brush EV, Eames MDC, Blalock TN, Hossack JA, Walker WF. The sonic window: Second generation prototype of low-cost, fully-integrated, pocket-sized medical ultrasound device. In: Proceedings - IEEE Ultrasonics Symposium. 2005. p. 273–6.
• Li Y, Blalock TN, Walker WF, Hossack JA. "Synthetic axial acquisition" full resolution C-scan ultrasonic imaging. In: Proceedings - IEEE Ultrasonics Symposium. 2005. p. 1392–5.
• Li Y, Blalock TN, Walker WF, Hossack JA. Phased subarrays for low cost C-scan applications. In: Proceedings - IEEE Ultrasonics Symposium. 2005. p. 1408–11.
• Ha JS, Walker WF, Hossack JA. Determination of an optimal image frame interval for frame-to-frame ultrasound image motion tracking. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2005 Mar;52(3):386–96.
• Viola F, Walker WF. A spline-based algorithm for continuous time-delay estimation using sampled data. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2005 Jan;52(1):80–93.
• Viola F, Walker WF. Efficient and accurate spline-based time delay estimation. In: Proceedings - IEEE Ultrasonics Symposium. 2004. p. 870–3.
• Ranganathan K, Santy MK, Fuller MI, Zhou S, Blalock TN, Hossack JA, et al. A prototype low cost handheld ultrasound imaging system. In: Progress in Biomedical Optics and Imaging - Proceedings of SPIE. 2004. p. 24–32.
• Guenther DA, Ranganathan K, McAllister MJ, Rigby KW, Walker WF. Synthetic aperture methods for angular scatter imaging. In: Progress in Biomedical Optics and Imaging - Proceedings of SPIE. 2004. p. 52–60.
• Guenther DA, Ranganathan K, McAllister MJ, Walker WF, Rigby KW. Synthetic aperture angular scatter imaging: System refinement. In: Proceedings - IEEE Ultrasonics Symposium. 2004. p. 243–7.
• Guenther DA, Ranganathan K, McAllister MJ, Walker WF, Rigby KW. Ultrasonic synthetic aperture angular scatter imaging. In: Conference Record - Asilomar Conference on Signals, Systems and Computers. 2004. p. 163–7.
• Viola F, Toth CA, Walker WF. Mechanical characterization of the vitreous body with acoustic radiation force. In 2004. p. 1777–80.
• Fuller MI, Ranganathan K, Zhou S, Blalock TN, Hossack JA, Walker WF. Portable, low-cost medical ultrasound device prototype. In: Proceedings - IEEE Ultrasonics Symposium. 2004. p. 106–9.
• Viola F, Walker WF. Spline based time delay estimation. In: Conference Record - Asilomar Conference on Signals, Systems and Computers. 2004. p. 173–7.
• Ranganathan K, Walker WF. A new performance analysis metric for medical ultrasound. In: Proceedings - IEEE Ultrasonics Symposium. 2004. p. 1737–40.
• Ranganathan K, Santy MK, Blalock TN, Hossack JA, Walker WF. Direct sampled I/Q beamforming for compact and very low-cost ultrasound imaging. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2004 Sep;51(9):1082–94.
• Viola F, Kramer MD, Lawrence MB, Oberhauser JP, Walker WF. Sonorheometry: a noncontact method for the dynamic assessment of thrombosis. Annals of biomedical engineering. 2004 May;32(5):696–705.
• Ha JS, Walker WF, Hossack JA. Optimum frame interval for ultrasound image motion estimation. In: Proceedings of the IEEE Ultrasonics Symposium. 2003. p. 1541–4.
• Ranganathan K, Santy MK, Hossack JA, Blalock TN, Walker WF. Direct sampled I/Q beamforming: A strategy for very low cost ultrasound. In: Proceedings of the IEEE Ultrasonics Symposium. 2003. p. 1863–6.
• Girard E, Zhou S, Walker W, Blalock T, Hossack J. High element count two dimensional transducer array. In: Proceedings of the IEEE Ultrasonics Symposium. 2003. p. 964–7.
• Viola F, Walker WF. A new algorithm for continuous time delay estimation using sampled data. In: Proceedings of the IEEE Ultrasonics Symposium. 2003. p. 1834–8.
• Fuller MI, Blalock TN, Hossack JA, Walker WF. A portable, low-cost, highly integrated, 3D medical ultrasound system. In: Proceedings of the IEEE Ultrasonics Symposium. 2003. p. 38–41.
• Mann JA, Walker WF. Constrained adaptive beamforming: Point and contrast resolution. In: Proceedings of SPIE - The International Society for Optical Engineering. 2003. p. 12–23.
• Viola F, Walker WF. Radiation force imaging of viscoelastic properties with reduced artifacts. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2003 Jun;50(6):736–42.
• Viola F, Walker WF. A comparison of the performance of time-delay estimators in medical ultrasound. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2003 Apr;50(4):392–401.
• Ranganathan K, Walker WF. A novel beamformer design method for medical ultrasound. Part II: Simulation results. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2003 Jan;50(1):25–39.
• Ranganathan K, Walker WF. A novel beamformer design method for medical ultrasound. Part I: Theory. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2003 Jan;50(1):15–24.
• Mann JA, Walker WF. A constrained adaptive beamformer for medical ultrasound: Initial results. In: Proceedings of the IEEE Ultrasonics Symposium. 2002. p. 1807–10.
• Walker WF, McAllister MJ. Angular scatter imaging: Clinical results and novel processing. In: Proceedings of the IEEE Ultrasonics Symposium. 2002. p. 1565–9.
• Ranganathan K, Walker WF. The minimum sum squared error (MSSE) beamformer design technique: Initial results. In: Proceedings of the IEEE Ultrasonics Symposium. 2002. p. 1697–700.
• Viola F, Walker WF. Ultrasound echo decorrelation due to acoustic radiation force. In: Proceedings of the IEEE Ultrasonics Symposium. 2002. p. 1903–6.
• Walker WF, McAllister MJ. Angular scatter imaging in medical ultrasound. In: Conference Record of the Asilomar Conference on Signals, Systems and Computers. 2002. p. 931–5.
• Viola F, Walker WF. Shear strain elastography. In: Proceedings of the IEEE Ultrasonics Symposium. 2002. p. 1907–11.
• Negron LA, Viola F, Black EP, Toth CA, Walker WF. Development and characterization of a vitreous mimicking material for radiation force imaging. IEEE Trans Ultrason Ferroelectr Freq Control. 2002 Nov;49(11):1543–51.
• Park EYH, Smith MJ, Stropp ES, Snapp KR, DiVietro JA, Walker WF, et al. Comparison of PSGL-1 microbead and neutrophil rolling: microvillus elongation stabilizes P-selectin bond clusters. Biophysical journal. 2002 Apr;82(4):1835–47.
• Viola F, Longo DM, Lawrence MB, Walker WF. Analysis of clot formation with acoustic radiation force. In: Proceedings of SPIE - The International Society for Optical Engineering. 2002. p. 235–42.
• Inrana MF, Walker WF. Erratum: (Medical Imaging 2002 Ultrasonic Imaging and Signal Processing (26-28 February 2002)). In: Proceedings of SPIE - The International Society for Optical Engineering. 2002. p. 462.
• Insana MF, Walker WF. Proceedings of SPIE - The International Society for Optical Engineering: Introduction. In: Proceedings of SPIE - The International Society for Optical Engineering. 2002.
• Ranganathan K, Walker WF. A novel aperture design method in ultrasound imaging. In: Proceedings of SPIE - The International Society for Optical Engineering. 2002. p. 13–24.
• Viola F, Walker WF. Imaging viscoelastic properties of the vitreous. In: Proceedings of the IEEE Ultrasonics Symposium. 2001. p. 1623–6.
• Ranganathan K, Walker WF. A novel aperture design method for improved depth of field in ultrasound imaging. In: Proceedings of the IEEE Ultrasonics Symposium. 2001. p. 1543–6.
• Viola F, Walker WF. Comparison of time delay estimators in medical ultrasound. In: Proceedings of the IEEE Ultrasonics Symposium. 2001. p. 1485–8.
• Cheezum MK, Walker WF, Guilford WH. Quantitative comparison of algorithms for tracking single fluorescent particles. Biophysical journal. 2001 Oct;81(4):2378–88.
• Walker WF. C- and D-weighted ultrasonic imaging using the translating apertures algorithm. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2001 Mar;48(2):452–61.
• Walker WF. The significance of correlation in ultrasound signal processing. In: Proceedings of SPIE - The International Society for Optical Engineering. 2001. p. 159–71.
• Fabian CM, Ballu KN, Hossack JA, Blalock TN, Walker WF. Development of a parallel acquisition system for ultrasound research. Proceedings of SPIE - The International Society for Optical Engineering. 2001 Jan 1;4325:54–62.
• McAllister MJ, Rigby KW, Walker WF. Evaluation of translating apertures based angular scatter imaging on a clinical imaging system. Proceedings of the IEEE Ultrasonics Symposium. 2001 Jan 1;2:1555–8.
• Ranganathan K, Walker WF. Analysis of C- and D-weighted imaging using the translating apertures algorithm. In: Proceedings of the IEEE Ultrasonics Symposium. 2000. p. 1605–9.
• Walker WF, Fernandez FJ, Negron LA. A method of imaging viscoelastic parameters with acoustic radiation force. Physics in medicine and biology. 2000 Jun;45(6):1437–47.
• Negron LA, Walker WF, Fernandez FJ. Tissue elasticity using acoustic radiation force. Proceedings of SPIE - The International Society for Optical Engineering. 2000 Jan 1;3982:306–14.
• McAllister MJ, Walker WF. Novel approaches to angular scatter imaging using the translating apertures algorithm. Proceedings of SPIE - The International Society for Optical Engineering. 2000 Jan 1;3982:360–9.
• Cheezum MK, Walker WF, Guilford WH. A comparison of particle tracking algorithms:: Implications for in vitro motility and single molecule fluorescence. In: BIOPHYSICAL JOURNAL. 2000. p. 249A-249A.
• Halpin G, Benefield LD, Walker WF, MacGuire S. An Evaluation of an Integrated Pre-Engineering Program: Results from the Freshman Year and Beyond. In: ASEE Annual Conference Proceedings. 1999. p. 625–46.
• Walker WF, McAllister MJ. C- and D-weighted imaging: theory and simulation. In: Proceedings of the IEEE Ultrasonics Symposium. 1999. p. 1557–61.
• Walker WF, Negron LA, Mondzelewski TJ, McAllister MJ, Fernandez FJ, Toth CA. Imaging the stiffness of the vitreous body with acoustic radiation force. In 1999. p. 1635–8.
• Lawrence MB, Smith MJ, Walker WF. Force modulation of selectin mediated leukocyte adhesive dynamics. In: Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings. 1999. p. 60.
• Walker WF. Internal deformation of a uniform elastic solid by acoustic radiation force. The Journal of the Acoustical Society of America. 1999 Apr;105(4):2508–18.
• Walker WF, Mondzelewski TJ, McAllister MJ, Fernandez FJ, Toth CA. Imaging of vitreous mechanical properties. In: INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE. ASSOC RESEARCH VISION OPHTHALMOLOGY INC; 1999. p. S571–S571.
• Walker WF, Trahey GE. The application of k-space in pulse echo ultrasound. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 1998 Jan;45(3):541–58.
• Walker WF. New class of aperture domain flow estimation algorithms. In: Proceedings of the IEEE Ultrasonics Symposium. 1997. p. 1227–32.
• Walker WF, Davidsen RE, Toth CA. Application of acoustic radiation force in ophthalmic ultrasound. Vol. 2, Proceedings of the IEEE Ultrasonics Symposium. 1997. p. 1291–6.
• Walker WF, Trahey GE. Aberrator integration error in adaptive imaging. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. 1997 Dec 1;44(4):780–91.
• Walker WF, Trahey GE. Speckle coherence and implications for adaptive imaging. The Journal of the Acoustical Society of America. 1997 Apr;101(4):1847–58.
• Ng GC, Freiburger PD, Walker WF, Trahey GE. A speckle target adaptive imaging technique in the presence of distributed aberrations. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 1997 Jan;44(1):140–51.
• Ng GC, Walker WF, Trahey GE. Improvement of signal correlation for adaptive imaging using the translating transmit aperture algorithm. Proceedings of the IEEE Ultrasonics Symposium. 1996 Dec 1;2:1395–400.
• Walker WF, Trahey GE. Limits on the performance of near field phase aberration correction. Proceedings of the IEEE Ultrasonics Symposium. 1995 Dec 1;2:1461–5.
• Walker WF, Trahey GE. Application of K-space in medical ultrasound. Proceedings of the IEEE Ultrasonics Symposium. 1995 Dec 1;2:1379–83.
• Ng GC, Freiburger PD, Walker WF, Trahey GE. New technique for adaptive imaging in the presence of distributed aberrations. Proceedings of the IEEE Ultrasonics Symposium. 1995 Dec 1;2:1455–9.
• Nightingale KR, Kornguth PJ, Walker WF, McDermott BA, Trahey GE. A novel ultrasonic technique for differentiating cysts from solid lesions: preliminary results in the breast. Ultrasound in medicine & biology. 1995 Jan;21(6):745–51.
• Walker WF, Trahey GE. A Fundamental Limit on Delay Estimation Using Partially Correlated Speckle Signals. IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. 1995 Jan 1;42(2):301–8.
• Walker WF, Trahey GE. Real-time synthetic receive aperture imaging: experimental results. Proceedings of the IEEE Ultrasonics Symposium. 1994 Dec 1;3:1657–60.
• Alsberg E, Trahey GE, Bohs LN, Friemel BH, Nightingale KR, Walker WF. Three-dimensional flow visualization via reconstruction from successive two-dimensional vector velocity maps. In: Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings. 1994. p. 598–9.
• Walker WF, Trahey GE. Fundamental limit on the accuracy of speckle signal alignment. Proceedings of the IEEE Ultrasonics Symposium. 1994 Dec 1;3:1787–91.
• Walker WF, Trahey GE. Fundamental limit on the performance of correlation based phase correction and flow estimation techniques. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. 1994 Sep 1;41(5):646–54.
• Nightingale KR, Kornguth PJ, Walker WF, Glasgow SC, Jett EA, Trahey GE. Generation and detection of acoustic streaming to differentiate between solid and cystic breast lesions. Proceedings of the IEEE Ultrasonics Symposium. 1994 Jan 1;3:1653–6.
• Walker WF, Trahey GE. A Fundamental Limit on the Performance of Correlation Based Phase Correction and Flow Estimation Techniques. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. 1994 Jan 1;41(5):644–54.
• Walker WF, Trahey GE. Fundamental limit on the performance of phase aberration correction and correlation based flow estimates in medical ultrasound. Proceedings of the IEEE Ultrasonics Symposium. 1993 Dec 1;2:1149–53.
• Walker WF, Friemel BH, Bohs LN, Trahey GE. Real-time imaging of tissue vibration using a two-dimensional speckle tracking system. Proceedings of the IEEE Ultrasonics Symposium. 1993 Dec 1;2:873–7.
• Alsberg E, Trahey GE, Bohs LN, Friemel BH, Nightingale KR, Walker WF. Three-dimensional flow visualization via reconstruction from successive two-dimensional vector velocity maps (Accepted). Proceedings of 16th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. :598–9.

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