Peer Reviewed Journal Publications

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20032004 20052006 20072008 20092010 20112012
2013



2013

  • N. Rubert, Tomy Varghese, "Mean scatterer spacing estimation using multi-taper coherence estimates", IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol. 60, No. 6, pp. 1061-1073, 2013. [Abstract]
  • S. Ahmed, R. Cao, Tomy Varghese, L. Bidaut, G. Nabi, "Transrectal quantitative shear wave elastography in the detection and characterization of prostate cancer", Surgical Endoscopy, Vol. 00, No. 0, pp. 000-000, 2013. [Abstract]
  • M. McCormick, Tomy Varghese, "An approach to unbiased subsample interpolation for motion tracking", Ultrasonic Imaging, Vol. 35, No. 2, pp. 76-89, 2013. [Abstract]
  • R. Cao, G. Nabi, Tomy Varghese, Z. Huang, "Tissue mimicking materials for the detection of prostate cancer using shear wave elastography: A validation study", Medical Physics, Vol. 40, No. 2, 022903, 2013. [Abstract]
  • H. Xu, Tomy Varghese, "Normal and shear strain imaging using 2D deformation tracking on beam-steered linear array datasets", Medical Physics, Vol. 40, No. 1, 012902, 2013. [Abstract]
  • C. Ma, Tomy Varghese,  "Comparison of cardiac displacement and strain imaging using ultrasound radiofrequency and envelope signals",  Ultrasonics, Vol. 53, No. 3, pp. 782-792, 2013. [Abstract]

2012

  • H. Xu, Tomy Varghese, J. Jiang, J.A. Zagzebski, "In-vivo classification of breast masses using features derived from axial-strain and axial-shear images", Ultrasonic Imaging, Vol. 34, No. 4, pp. 222-236, 2012. [Abstract]
  • R.J. DeWall, Tomy Varghese, C.L. Brace, "Visualizing ex-vivo radiofrequency and microwave ablation zones using electrode vibration elastography", Medical Physics, Vol. 39, No. 11, pp. 6692-6700, 2012. [Abstract]
  • M McCormick, Tomy Varghese, X. Wang, R.J. Dempsey, C. C. Mitchell, and M.A. Kliewer, "Methods for robust in-vivo strain estimation in the carotid artery", Physics in Medicine and Biology, Vol. 57, No. 22, pp.7329-7353, 2012. [Abstract]
  • W Ge, CG Krueger, A Weichmann, D Shanmuganayagam, and Tomy Varghese, "Displacement and strain estimation for evaluation of arterial wall stiffness using a familial hypercholesterolemia swine model of atherosclerosis", Medical Physics, Vol. 39, No. 7, pp. 4483-4492, 2012. [Abstract]
  • BG Rocque, D Jackson, Tomy Varghese, B Hermann, M McCormick, MA Kliewer , C Mitchell, RJ Dempsey, "Impaired cognitive function in patients with atherosclerotic carotid stenosis and correlation with ultrasound strain measurements", J Neurol. Sci., Vol. 322, No. 1-2, pp. 20-24, 2012. [Abstract]
  • R.J. DeWall, Tomy Varghese, "Improving thermal ablation delineation with electrode vibration elastography using a bi-directional shear wave propagation assumption", IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol. 59, No. 1, pp. 168-173, 2012. [Abstract]
  • R.J. DeWall, Tomy Varghese, C.L. Brace, "Quantifying local stiffness variations in radiofrequency ablations with dynamic indentation", IEEE Transactions on Biomedical Engineering, Vol. 59, No. 3, pp. 728-735, 2012. [Abstract]
  • E. Omari, Tomy Varghese, M.A. Kliewer, "A saline infusion sonohysterography based novel strain imaging approach for evaluation of uterine abnormalities in-vivo: Preliminary results",  Journal of Ultrasound in Medicine, Vol. 31, No. 4, pp. 609-615, 2012. [Abstract]
  • C. Ma, Tomy Varghese,  "Lagrangian deformation tracking using a polar-grid between endocardial and epicardial contours for cardiac strain imaging",  Medical Physics, Vol. 39, No. 4, pp. 1779-1792, 2012. [Abstract]
  • R.J. DeWall, S. Bharat, Tomy Varghese, M.E. Hanson, R.M. Agni, M.A. Kliewer, "Characterizing thecompression dependent viscoelastic properties of human hepatic pathologies using dynamic compression testing", Physics in Medicine and Biology, Vol. 57, No. 8, pp. 2273-2286, 2012. [Abstract]

2011

  • H. Xu, Tomy Varghese, and E.L. Madsen "Analysis of Shear Strain Imaging for Classifying Breast Masses: Finite element and Phantom results," Medical Physics, Vol. 38, No. 11, pp, 6119-6127, 2011. [Abstract]
  • M. McCormick, E.L. Madsen, M. Deaner, and Tomy Varghese, "Absolute backscatter measurements of tissue-mimicking phantoms in the 5-50 MHz frequency range" Journal Acoustic Society of America, Vol. 130, No. 2, pp, 737-743, 2011. [Abstract]
  • E. Omari, H. Lee, Tomy Varghese, "Theoretical and phantom based investigation of the impact of sound speed and backscatter variations on attenuation slope estimation", Ultrasonics, Vol. 51, No. 6, pp. 758-767, 2011. [Abstract]
  • M. McCormick, N. Rubert, and Tomy Varghese, "Bayesian Regularization applied to Ultrasound Strain Imaging," IEEE Transactions on Biomedical Engineering, Vol. 58, No. 6, pp, 1612-1620, 2011. [Abstract]
  • R.J. DeWall, Tomy Varghese, and E.L. Madsen, "Shear Wave Velocity Imaging using Transient Electrode Perturbation: Phantom and ex-vivo validation", IEEE Transactions on Medical Imaging, Vol. 30, No. 3, pp. 666-678, 2011. Digital Object Identifier: 10.1109/TMI.2010.2091412. (PMCID: PMC3066053) [Abstract]
  • M.Z. Kiss, Tomy Varghese, and M.A. Kliewer, "Ex-vivo ultrasound attenuation coefficient for human cervical and uterine tissue from 5 to 10 MHz", Ultrasonics, Vol. 51, No. 4, pp. 467-471, 2011. Digital Object Identifier: 10.1016/j.ultras.2010.11.012. (PMCID: PMC3056396) [Abstract]

2010

  • N. Rubert, S. Bharat, R.J. Dewall, A. Andreano, C. Brace, J. Jiang, and Tomy Varghese, "Electrode Displacement Strain Imaging of Thermally-Ablated Liver Tissue in an in-vivo Animal Model", Medical Physics, Vol. 37, No. 3, pp. 1075-1082, 2010. (PMCID: PMC2837725). [Abstract]
  • J. Jiang, C. Brace, A. Andreano, R. DeWall, N. Rubert, T. Fisher, Tomy Varghese, F.T. Lee Jr., and T.J. Hall, "Ultrasound based elastic modulus imaging for visualizing thermal ablation zones in a porcine model", Physics in Medicine and Biology, Vol. 55, No.8, pp,2281-2306, 2010. (PMCID: PMC3068604). [Abstract]
  • M.J. Daniels, Tomy Varghese, "Dynamic frame selection for in-vivo ultrasound temperature estimation during radiofrequency ablation," Physics in Medicine and Biology, Vol. 55, No.16, pp. 4735-4753, 2010. (PMCID: PMC3065174). [Abstract]
  • S. Bharat, Tomy Varghese, "Radiofrequency electrode vibration-induced shear wave imaging for tissue modulus estimation: a simulation study" Journal Acoustic Society of America, Vol. 128, No.4, pp. 1582-1585, 2010. Also reproduced in Virtual Journal of Biological Physics Research, Vol. 20, Issue 9, 2010. (PMCID: PMC2981108). [Abstract]
  • H. Xu, M. Rao, Tomy Varghese, A. Sommer, S. Baker, TJ Hall, GA Sisney, ES Burnside, "Axial Shear Strain Imaging for Differentiating Benign and Malignant Breast Masses", Ultrasound in Medicine and Biology, Vol. 36, No. 11, pp. 1813"1824, 2010. doi:10.1016/j.ultrasmedbio.2010.07.008. (PMCID: PMC3033738). [Abstract]
  • H. Chen, and Tomy Varghese, "Three Dimensional Canine Heart Model for Cardiac Elastography," Medical Physics, Vol. 37, No. 11, pp. 5876-5886, 2010. doi:10.1118/1.3496326. Also reproduced in Virtual Journal of Biological Physics Research, Vol. 20, Issue 9, 2010. (PMCID: PMC2980546). [Abstract]
  • R.J. DeWall, Tomy Varghese, M.A. Kliewer, J.M. Harter, and E.M. Hartenbach, "Compression-dependent Viscoelastic Behavior of Human Cervical Tissue", Ultrasonic Imaging,Vol. 31, No. 4, pp. 203-216, 2010. (PMCID: PMC3074596). [Abstract]

2009

  • H. Chen, Tomy Varghese, PS. Rahko, J.A. Zagzebski, "Ultrasound frame rate requirements for elastography during cyclic compressions: Experimental and in-vivo results", Ultrasonics, (Epub 2008 Jun 20), Vol. 49, No. 1, pp. 98-111, 2009. [Abstract]
  • J. Farron, Tomy Varghese, D.G. Thelen, "Measurement of tendon strain during muscle twitch contractions using ultrasound elastography", IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol. 56, No. 1, pp. 27-35, 2009. [Abstract]
  • M. Rao, and Tomy Varghese, "Estimation of the optimal maximum beam angle and angular increment for normal and shear strain estimation", IEEE Transactions on Biomedical Engineering, Vol. 56, No. 3, pp. 760-769, 2009. [Abstract]
  • H. Chen, and Tomy Varghese, "Principal component analysis of shear strain effects", Ultrasonics, Vol. 49, No. 4-5, pp. 472-483, 2009. [Abstract]
  • M. Z. Kiss, M.J. Daniels and Tomy Varghese, "Investigation of temperature-dependent viscoelastic properties of thermal lesions in in-vitro animal liver tissue", J. Biomech, Vol. 42, No. 8, pp. 959-966, 2009. (PMCID: PMC2760997). [Abstract]
  • H. Chen, and Tomy Varghese, "Multi-level hybrid 2-D strain imaging algorithm for ultrasound sector/ phased arrays", Medical Physics, Vol. 36, No. 6, pp. 2098-2106, 2009. (PMCID: PMC2832063). [Abstract]
  • J. Jiang, Tomy Varghese, C. Brace, E.L. Madsen, T.J Hall, S. Bharat, M.A Hobson, J.A. Zagzebski, and F.T. Lee Jr., "Young"s modulus reconstruction for radiofrequency ablation electrode-induced displacement fields: A feasibility study", IEEE Transactions on Medical Imaging, Vol. 28, No. 8, pp. 1325-1334, 2009. (PMCID: PMC2843513). [Abstract]
  • H. Shi, Tomy Varghese, C.C. Mitchell, M. McCormick, R.J. Dempsey, M.A. Kliewer, "In-vivo attenuation and equivalent scatterer size parameters for atherosclerotic carotid plaque: preliminary results", Ultrasonics, Vol. 49, No. 8, pp. 779-785, 2009. (PMCID: PMC2785011). [Abstract]

2008

  • M.J. Daniels, Tomy Varghese, J. Jiang, "Ultrasound simulation of real-time temperature estimation during radiofrequency ablation using finite element models", Ultrasonics, (Epub 2007 November 5), Vol. 48, No. 1, pp. 40-55, March 2008. (PMCID: PMC2777513). [Abstract]
  • M. Rao, Tomy Varghese, and E.L. Madsen, "Shear strain imaging using shear deformations", Medical Physics, Vol. 35, No. 2, pp. 412-423, February 2008. Also reproduced in Virtual Journal of Biological Physics Research, Vol. 15, Issue 2, 2008. (PMCID: PMC2481232). [Abstract]
  • H. Kim, J.A. Zagzebski and Tomy Varghese, "Estimation of ultrasound attenuation from broadband echo-signals using bandpass filtering", IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol. 55, No. 5, pp. 1153-1159, May 2008. [Abstract]
  • H. Chen, and Tomy Varghese, "Noise analysis and improvement of displacement vector estimation from angular displacements", Medical Physics, Vol. 35, No. 5, pp. 2007-2017, May 2008. (PMCID: PMC2673636). [Abstract]
  • S. Bharat, Tomy Varghese, E. L. Madsen, and J. A. Zagzebski, "Radiofrequency ablation electrode displacement elastography: A phantom study," Medical Physics, Vol. 35, No. 6, pp. 2432-2442, June 2008. (PMCID: PMC2673634). [Abstract]
  • M. Rao, Tomy Varghese, and J.A. Zagzebski, "Simulation of ultrasound two-dimensional array transducers using a frequency domain model", Medical Physics, Vol. 35, No. 7, pp. 3162-3169, July 2008. [Abstract]
  • W. Liu, J.A. Zagzebski, T.J. Hall, E.L. Madsen, Tomy Varghese, M.A. Kliewer, S. Panda, S. Barnes, C. Lowery, "Acoustic backscatter and effective scatterer size estimates using a 2D CMUT transducer", Physics in Medicine and Biology, (Epub 2008 Jul 17), Vol. 53, No. 15, pp.4169-4183, 2008. (PMCID: PMC2758163). [Abstract]
  • S. Bharat, T.G. Fisher, Tomy Varghese, T.J. Hall, J. Jiang, E.L. Madsen, J.A. Zagzebski, and F.T. Lee Jr., "Three-dimensional electrode displacement elastography using the Siemens C7F2 fourSight four-dimensional ultrasound transducer," Ultrasound in Medicine and Biology, (Epub 2008 March 26), Vol. 34, No. 8, pp. 1307-1316, 2008. (PMCID: PMC2597045). [Abstract]
  • M.A. Hobson, E.L. Madsen, G.R. Frank, J. Jiang, H. Shi, T.J. Hall, Tomy Varghese, "Anthropomorphic phantoms for assessment of strain imaging methods involving saline infused sonohysterography", Ultrasound in Medicine and Biology, (Epub 2008 May 30), Vol. 34, No.10, pp. 1622-1637, 2008. [Abstract]
  • H. Shi, Tomy Varghese, R.J. Dempsey, M.S. Salamat, J.A. Zagzebski, "Relationship between ultrasonic attenuation, size and axial strain parameters for ex-vivo atherosclerotic carotid plaque," Ultrasound in Medicine and Biology, (Epub 2008 May 17), Vol. 34, No.10, pp. 1666-1677, 2008. (PMCID: PMC2679642). [Abstract]
  • M. Rao, and Tomy Varghese, "Correlation analysis of three-dimensional strain imaging using ultrasound two-dimensional array transducers", Journal Acoustic Society America, Vol. 124, No.3, pp. 1858-1865, 2008. [Abstract]
  • H. Shi, C.C. Mitchell, M. McCormick, M.A. Kliewer, R.J. Dempsey, Tomy Varghese, "Preliminary in-vivo atherosclerotic carotid plaque characterization using the accumulated axial strain and relative lateral shift based strain indices", Physics in Medicine and Biology, Vol. 53, No. 22, pp. 6377-6394, 2008. (PMCID: PMC2891504). [Abstract]
  • H. Kim, and Tomy Varghese, "Hybrid spectral domain method for attenuation slope estimation",Ultrasound in Medicine and Biology, (Epub 2008 July 11), Vol. 34, No.11, pp. 1808-1819, 2008. [Abstract]

2007

  • H. Chen, H. Shi, and Tomy Varghese, "Improvement of elastographic displacement estimation using a two-step cross-correlation method," Ultrasound in Medicine and Biology, Vol. 33, No.1, pp. 48-56, January 2007. (PMCID: PMC1829320). [Abstract]
  • M. Rao, Q. Chen, H. Shi, Tomy Varghese, E.L. Madsen, J.A. Zagzebski and T.A. Wilson, "Normal and shear strain estimation using beam steering on linear-array transducers", Ultrasound in Medicine and Biology, Vol. 33, No.1, pp. 57-66, January 2007. (PMCID: PMC1839057). [Abstract]
  • H. Shi and Tomy Varghese, "Two-dimensional multi-level strain estimation for discontinuous tissue", Physics in Medicine and Biology, (Epub 2006 December 29), Vol. 52, No. 2, pp. 389-401, January 2007. [Abstract]
  • H. Shi, H. Tu, R.J. Dempsey, and Tomy Varghese, "Ultrasonic attenuation estimation in small plaque samples using a power difference method," Ultrasonic Imaging, Vol. 29, No. 1, pp. 15-30, January 2007. [Abstract]
  • J. Jiang, Tomy Varghese, Q. Chen, T.J. Hall, and J.A. Zagzebski, "Finite element analysis of tissue deformation with a radiofrequency ablation electrode for strain imaging", IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol. 54, No.2, pp. 281-289, February 2007. [Abstract]
  • H. Kim and Tomy Varghese, "Attenuation estimation using spectral cross-correlation", IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol. 54, No.3, pp. 510-519, March 2007. [Abstract]
  • M.A. Hobson, M.Z. Kiss, Tomy Varghese, M.A. Kliewer, J.A. Zagzebski, T.J. Hall, J. Harter, E. M. Hartenbach and E. L. Madsen, "In-Vitro Uterine Strain Imaging: Preliminary Results", Journal of Ultrasound in Medicine, Vol. 26, pp. 899-908, 2007. [Abstract]
  • M.J. Daniels, Tomy Varghese, E.L. Madsen and J.A. Zagzebski "Non invasive ultrasound-based temperature imaging for monitoring radiofrequency heating: phantom results", Physics in Medicine and Biology, (Epub 2007 July 30), Vol. 52, No. 16, pp. 4827-4823, August 2007. [Abstract]
  • M. Rao and Tomy Varghese, "Correlation analysis for angular compounding in strain imaging", IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol. 54, No. 9, pp. 1903-1907, September 2007. (PMCID: PMC2442275). [Abstract]

2006

  • C. Gorig, Tomy Varghese, T.A. Stiles, JVD Broek, J.A. Zagzebski, C. J. Murphy, "Evaluation of acoustic wave propagation velocities in the ocular lens and vitreous tissues of pigs, dogs, and rabbits", American Journal of Veterinary Research, Vol. 67, No.2, pp. 288-295, February 2006. [Abstract]
  • E.L. Madsen, M.A. Hobson, H. Shi, Tomy Varghese and G.R. Frank, "Stability of heterogeneous elastography phantoms made from oil dispersions in aqueous gels", Ultrasound in Medicine and Biology, Vol. 32, No.2, pp. 261-270, February 2006. [Abstract]
  • M. Rao, Q. Chen, H. Shi, Tomy Varghese, "Spatial-angular compounding for elastography using beam steering on linear array transducers", Medical Physics, Vol. 33, No. 3, pp. 618-626, March 2006. (PMCID: PMC1815397). [Abstract]
  • W. Liu J.A. Zagzebski, Tomy Varghese, C.R. Dyer, U. Techavipoo, and T. J. Hall "Segmentation of elastographic images using a coarse-to-fine active contour model", Ultrasound in Medicine and Biology, Vol. 32, No.3, pp. 397-408, March 2006. (PMCID: PMC1764611). [Abstract]
  • M. Rao, and Tomy Varghese, "Correlation Analysis of the beam angle dependence for elastography", Journal Acoustic Society America, Vol. 119, No. 6, pp. 4093-4101, June 2006. (PMCID: PMC1785330). [Abstract]
  • E.L. Madsen, M.A. Hobson, G.R. Frank, H. Shi, J. Jiang, T J Hall, Tomy Varghese, M M. Doyley and J B Weaver, "Anthropomorphic breast phantoms for testing elastography systems", Ultrasound in Medicine and Biology, Vol. 32, No.6, pp. 857-874, June 2006. [Abstract]
  • T.A. Wilson, Q. Chen, J. A. Zagzebski, Tomy Varghese, and L. Van Middlesworth, "Initial clinical experience imaging scatterer size and strain in thyroid nodules in-vivo" Journal of Ultrasound in Medicine, Vol. 25, No.8, pp. 1021-1029, August 2006. [Abstract]
  • M.Z. Kiss, M.A. Hobson, Tomy Varghese, J. Harter, M.A. Kliewer, E.M. Hartenbach, and J.A. Zagzebski "Frequency-dependent complex modulus of the uterus: preliminary results", Physics in Medicine and Biology, (Epub 2006 July 12), Vol. 51, No.15, pp. 3683-3695, August 2006. [Abstract]
  • T. Wilson, J. A. Zagzebski, Tomy Varghese, Q. Chen, and M. Rao, "The Ultrasonix 500RP: A commercial ultrasound research interface", IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol. 53, No. 10, pp. 1772-1782, October 2006. [Abstract]
  • W. Liu, J.A. Zagzebski, Tomy Varghese, A.L. Gerig, and T.J. Hall, "Spectral and scatterer size correlation during angular compounding: simulation and experimental studies", Ultrasonic Imaging, Vol. 28, No. 4, pp. 230-244, October 2006. [Abstract]
  • G. Pareek, E.R. Wilkinson, S. Bharat, Tomy Varghese, P.F. Laeseke, F.T. Lee Jr., T.F. Warner, J.A. Zagzebski, S.Y. Nakada, "Elastographic measurements of in-vivo radiofrequency ablation lesions of the kidney", Journal of Endourology, Vol. 20, No. 11, pp. 959-964. November 2006. [Abstract]
  • S. Bharat and Tomy Varghese, "Contrast transfer improvement for electrode displacement elastography," Physics in Medicine and Biology, (Epub 2006 November 27), Vol. 51, No. 24, pp. 6403-6418, December 2006. [Abstract]

2005

  • S. Bharat, U. Techavipoo, M.Z. Kiss, W. Liu, and Tomy Varghese , Monitoring Stiffness Changes in Lesions after Radiofrequency Ablation at Different Temperatures and Durations of Ablation, Ultrasound in Medicine and Biology, Vol. 31, No. 3, pp. 415-422, 2005. [Abstract]
  • U. Techavipoo, Tomy Varghese , Improvements in Elastographic Contrast to Noise Ratio Using Spatial-Angular Compounding, Ultrasound in Medicine and Biology, Vol. 31, No. 4, pp. 529-536, 2005. (PMCID: PMC1440923), [Abstract]
  • Q. Chen, A. L. Gerig, U. Techavipoo, J.A. Zagzebski, and Tomy Varghese , Correlation of RF Signal in Angular Compounding, IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol. 52, No. 6, pp. 961-970, 2005. (PMCID: PMC1479311) [Abstract]
  • U. Techavipoo, Q. Chen, Tomy Varghese, "Ultrasonic noninvasive temperature estimation using echoshift gradient maps: simulation results", Ultrasonic Imaging Vol. 27, No.3, pp. 166-180, July 2005. [Abstract]
  • M. Rao, and Tomy Varghese "Spatial angular compounding for elastography without the incompressibility assumption", Ultrasonic Imaging Vol. 27, No. 4, pp. 256-270, October 2005.(PMCID: PMC1994653). [Abstract]
  • H. Shi, Q. Chen, and Tomy Varghese, "A general solution for catheter position effects for strain estimation in intravascular elastography",Ultrasound in Medicine and Biology, Vol. 31, No. 11, pp. 1509-1526, November 2005. [Abstract]
  • E.L. Madsen, M.A. Hobson, H. Shi, Tomy Varghese, and G.R. Frank, "Tissue-mimicking agar/gelatin materials for use in heterogeneous elastography phantoms, Physics in Medicine and Biology, (Epub 2005 November 16), Vol. 50, No.23, pp. 5597-5618, December 2005. [Abstract]
  • E.L. Madsen, G.R. Frank, M.A. Hobson, H. Shi, J. Jiang, Tomy Varghese and T.J. Hall, "Spherical lesion phantoms for testing the performance of elastography systems", Physics in Medicine and Biology (Epub 2005 December 6), Vol. 50, No.24, pp. 5983-5995, December 2005. [Abstract]

2004

  • Tomy Varghese , H. Shi, Elastographic Imaging Of Thermal Lesions In Liver In-Vivo Using Diaphragmatic Stimuli, Ultrasonic Imaging, Vol. 26, No. 1, pp. 18-28, 2004.[Abstract]
  • U. Techavipoo, Tomy Varghese , Wavelet denoising of displacement estimates in elastography, Ultrasound in Medicine and Biology, Vol. 30, No. 4, pp. 477-491, 2004. [Abstract]
  • Tomy Varghese , U. Techavipoo, J.A. Zagzebski, and F.T. Lee Jr., Impact of gas bubbles generated during interstitial ablation on elastographic depiction of in vitro thermal lesions, Journal of Ultrasound in Medicine, Vol. 23, No. 4, pp. 535-544, 2004. [Abstract]
  • U. Techavipoo, Tomy Varghese , J.A. Zagzebski, Q. Chen, and W. Liu, Semiautomated thermal lesion segmentation for three-dimensional elastographic imaging, Ultrasound in Medicine and Biology, Vol. 30, No. 5, pp. 655-664, 2004. [Abstract]
  • U. Techavipoo, Q. Chen, Tomy Varghese , J.A. Zagzebski, and E.L. Madsen, Noise Reduction Using Spatial-Angular Compounding for Elastography, IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol. 51, No. 5, pp. 510-520, 2004. [Abstract]
  • A.L. Gerig. Tomy Varghese , and J.A. Zagzebski, Improved Parametric Imaging of Scatterer Size Estimates Using Angular Compounding, IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol. 51, No. 6, pp. 708-715, 2004. [Abstract]
  • U. Techavipoo, Tomy Varghese, Q.Chen, T.A. Stiles, J.A. Zagzebski, and G.R. Frank, Temperature dependence of ultrasonic propagation speed and attenuation in excised canine liver tissue measured using transmitted and reflected pulses, J Acoust Soc Am. Vol. 115, No.6, pp. 2859-65, 2004. [Abstract]
  • W. Liu, U. Techavipoo, Tomy Varghese , J.A. Zagzebski, Q.Chen, and F.T. Lee Jr., Elastographic versus x-ray CT imaging of radio frequency ablation coagulations: an in vitro study, Medical Physics. Vol. 31, No.6, pp. 1322-1332, 2004. [Abstract]
  • M.Z. Kiss, Tomy Varghese, and T.J. Hall, Viscoelastic characterization of in-vitro canine tissue, Physics in Medicine and Biology, Vol. 49, No. 18, pp. 4207-4218, 2004. [Abstract]
  • A.L. Gerig, Q. Chen, J.A. Zagzebski and Tomy Varghese, Correlation of ultrasonic scatterer size estimates for the statistical analysis and optimization of angular compounding. Journal of the Acoustic Soceity of America, Vol. 116, No. 3, pp. 1832-1841, 2004.[Abstract]
  • U.Techavipoo, Q. Chen, Tomy Varghese, and J.A. Zagzebski, Estimation of Displacement Vectors and Strain Tensors in Elastography Using Angular Insonifications, IEEE Transactions on Medical Imaging, Vol. 23, No. 12, pp. 1479-1489, 2004.[Abstract]
  • S.K. Alam, F.L. Lizzi, Varghese T., Feleppa E.J., and Ramachandran S., Adaptive spectral strain estimators for elastography, Ultrasonic Imaging, Vol. 26, No. 3, pp. 131-149, 2004.[Abstract]
  • Varghese T., and Daniels M.J., Real-time calibration of temperature estimates during radiofrequency ablation, Ultrasonic Imaging, Vol. 26, No. 3, pp. 185-200, 2004.[Abstract]

2003

  • Tomy Varghese , J.A. Zagzebski, P. Rahko, and C.S. Breburda, Ultrasonic imaging of myocardial strain using cardiac elastography, Ultrasonic Imaging, Vol. 25, No. 1, pp. 1-16, 2003.[Abstract]
  • E.L. Madsen, G.R. Frank, T.A. Krouskop, Tomy Varghese , F. Kallel and J. Ophir, Tissue-mimicking Oil-in-gelatin Emulsions for use in Heterogeneous Elastography Phantoms, Ultrasonic Imaging, Vol. 25, No. 1, pp. 17-38, 2003. [Abstract]
  • A. Gerig, J.A. Zagzebski, and Tomy Varghese , Statistics of ultrasonic scatterer size estimation with a reference phantom, Journal Acoustic Society America, Vol. 113, No. 6, pp. 3430-3437, 2003. [Abstract]
  • Tomy Varghese , U. Techavipoo, W. Liu, J.A. Zagzebski, Q. Chen, G. Frank and F.T. Lee Jr., Elastographic measurement of the area and volume of thermal lesions resulting from radiofrequency ablation: pathologic correlation, AJR, Vol. 181, No. 3, pp. 701-707, 2003.[Abstract]
  • H. Tu, Tomy Varghese , E.L. Madsen, Q. Chen, J.A. Zagzebski, Ultrasound attenuation imaging using compound acquisition and processing, Ultrasonic Imaging, Vol. 25, No. 4, pp. 245-261, 2003.[Abstract]
  • H. Shi, Tomy Varghese , Q. Chen, G. Gimelli, Correction for simultaneous catheter eccentricity and tilt in intravascular elastography, Ultrasonic Imaging, Vol. 25, No. 4, pp. 262-283, 2003.[Abstract]

2002

  • Tomy Varghese , J.A. Zagzebski, Q. Chen, U. Techavipoo, G. Frank, C. Johnson, A. Wright and F.T. Lee Jr., Ultrasound monitoring of temperature change during radio frequency ablation: Preliminary in-vivo results, Ultrasound in Medicine and Biology, Vol. 28, No. 3, pp. 321-329, 2002. [Abstract]
  • Tomy Varghese , J.A. Zagzebski, G. Frank, and E.L.Madsen Elastographic imaging using a handheld compressor, Ultrasonic Imaging, Vol. 24, pp. 25-35, 2002. [Abstract]
  • Tomy Varghese , J.A. Zagzebski and F.T. Lee Jr., Elastographic Imaging of thermal lesions in the liver in-vivo following radiofrequency ablation: Preliminary Results, Ultrasound in Medicine and Biology, Vol. 28, No. 11/12, pp. 1467-1473, 2002. [Abstract]
  • U. Techavipoo, Tomy Varghese , J.A. Zagzebski, T.A. Stiles and G. Frank, Temperature Dependence of Ultrasonic Propagation Speed and Attenuation in Canine Tissue, Ultrasonic Imaging, Vol. 24, pp. 246-260, 2002. [Abstract]

2001

  • Tomy Varghese , M. Bilgen and J. Ophir, Phase aberration effects on strain estimation in elastography, Ultrasound in Medicine and Biology, Vol. 27, No. 6, pp. 819-827, 2001. [Abstract]
  • Tomy Varghese and J Ophir, Experimental corroboration of the nonstationary strain estimation errors in elastography, Ultrasound in Medicine and Biology, Vol. 27, No. 12, pp. 1677-1682, 2001. [Abstract]
  • Tomy Varghese , J. Ophir, E. E. Konofagou, F. Kallel, R. Righetti, Tradeoffs In Elastographic Imaging, Ultrasonic Imaging, Vol. 23, 216-248, 2001. [Abstract]

2000

  • S. K. Alam, J. Ophir, and Tomy Varghese, Elastographic axial resolution criteria: An experimental study,IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol. 47, No. 1, pp. 304-309, 2000.[Abstract]
  • E. E. Konofagou, Tomy Varghese, and J. Ophir, Spectral estimators in elastography, Ultrasonics, Vol. 38, No. 1-8, pp. 412-416, 2000.[Abstract]
  • Tomy Varghese, J. Ophir, and T A. Krouskop Non-linear stress-strain relationships in tissue and their effect on the contrast-to-noise ratio in elastograms, Ultrasound in Medicine and Biology, Vol. 26, No. 5, pp. 839-851, 2000.[Abstract]
  • E. E. Konofagou, Tomy Varghese, and J. Ophir, Theoretical bounds on the estimation of transverse displacement, transverse strain and Poisson's ratio in elastography, Ultrasonic Imaging, Vol. 22, No. 3, pp. 153-177, 2000. [Abstract]
  • Tomy Varghese, E. E. Konofagou, J. Ophir, S. K. Alam and M. Bilgen, Direct strain estimation in elastography using spectral cross-correlation, Ultrasound in Medicine and Biology, Vol. 26, No. 9, pp. 1525-1537, 2000. [Abstract]

1999

  • Tomy Varghese, and J. Ophir, A method for the experimental characterization of the noise performance of elastographic systems, Ultrasonic Imaging, Vol. 21, No. 1, pp. 17-30, 1999.[Abstract]
  • E. E. Konofagou, Tomy Varghese, J. Ophir, and S. K. Alam, Power spectral strain estimators in elastography, Ultrasound in Medicine and Biology, Vol. 25, No. 7, pp. 1115-1129, 1999.[Abstract]

1998

  • Tomy Varghese, M. Bilgen, and J. Ophir, Multiresolution imaging in elastography, IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol. 45, No. 1, pp. 65-75, 1998.[Abstract]
  • Tomy Varghese, and J. Ophir, Characterization of elastographic noise using the envelope of echo signals, Ultrasound in Medicine and Biology, Vol. 24, No. 4, pp. 543-555, 1998.[Abstract]
  • Tomy Varghese, and J. Ophir, An analysis of the elastographic contrast-to-noise ratio performance, Ultrasound in Medicine and Biology, Vol. 24, No. 6, pp. 915-924, 1998.[Abstract]
  • S. K. Alam, J. Ophir, E. I. Cespedes, and Tomy Varghese, A deconvolution filter for improvement of time-delay estimation in elastography,IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol. 45, No. 6, pp. 1565-1572, 1998.[Abstract]

1997

  • Tomy Varghese, and J. Ophir, A theoretical framework for performance characterization of elastography: The strain filter, IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol. 44, No. 1, pp. 164-172, 1997.[Abstract]
  • Tomy Varghese, and J. Ophir, Enhancement of echo-signal correlation in elastography using temporal stretching, IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol. 44, No. 1, pp. 173-180, 1997.[Abstract]
  • E. E. Konofagou, J. Ophir, F. Kallel, and Tomy Varghese, Elastographic dynamic range expansion using variable applied strains, Ultrasonic Imaging, Vol. 19, No. 1, pp. 145-166, 1997.[Abstract]
  • Tomy Varghese, and J. Ophir, The nonstationary strain filter in elastography, Part-I, Frequency dependent attenuation, Ultrasound in Medicine and Biology, Vol. 23, No. 9, pp. 1343-1356, 1997.[Abstract]
  • F. Kallel, Tomy Varghese, J. Ophir and M. Bilgen, The nonstationary strain filter in elastography, Part-II, Lateral and elevational decorrelation, Ultrasound in Medicine and Biology, Vol. 23, No. 9, pp. 1357-1369, 1997.[Abstract]

1996

  • M. Wang, L. G. Hassebrook, J. Evans, Tomy Varghese, and C. Knapp, An optimized index of human cardiovascular adaptation to simulated weightlessness, IEEE Transactions on Biomedical Engineering, Vol. 43, No. 5, pp. 502-511, 1996.[Abstract]
  • Tomy Varghese, K. D. Donohue, V. L. Genis, and E. J. Halpern, Order selection criteria for detecting mean scatterer spacing with the AR model, IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol. 43, No. 5, pp. 979-984, 1996.[Abstract]
  • Tomy Varghese, and Jonathan Ophir, Performance optimization in elastography: Multicompression with temporal stretching, Ultrasonic Imaging, Vol. 18, No. 3, pp. 193-214, 1996.[Abstract]
  • Tomy Varghese, J. Ophir, and E. I. Cespedes, Noise reduction in elastography using temporal stretching with multicompression averaging, Ultrasound in Medicine and Biology, Vol. 22, No. 8, pp. 1043-1052, 1996.[Abstract]
  • Tomy Varghese, and J. Ophir, Estimating tissue strain from signal decorrelation using the correlation coefficient, Ultrasound in Medicine and Biology, Vol. 22, No. 9, pp. 1249-1254, 1996.[Abstract]

1995

  • Tomy Varghese, and K. D. Donohue, Estimating mean scatterer spacing with the frequency-smoothed spectral autocorrelation function, IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol. 42, No. 3, pp. 451-463, 1995.[Abstract]

1994

  • Tomy Varghese, and K. D. Donohue, Mean scatterer spacing estimates with spectral correlation, Journal Acoustic Society America, Vol. 96, No. 6, pp. 3504-3515, 1994.[Abstract]

1993

  • K.D. Donohue. J. M. Bressler, Tomy Varghese, and N. M. Bilgutay, Spectral correlation in ultrasonic pulse-echo signal processing, IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol.-40, pp. 330-337, 1993. [Abstract]
  • Tomy Varghese, and K. D. Donohue, Characterization of tissue microstructure scatterer distribution with spectral correlation, Ultrasound Imaging Vol.-15, pp. 238-254, 1993.[Abstract]



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