A Hand-Held Probe for Vibro-Elastography

Vibro-elastography is a new medical imaging method that identifies the mechanical properties of tissue by measuring tissue motion in response to a multi-frequency external vibration source. Previous research on vibro-elastography used ultrasound to measure the tissue motion and system identification techniques to identify the tissue properties. This paper describes a hand-held probe with a combined vibration source and ultrasound transducer. The design uses a vibration absorption system to counter-balance the reaction forces from contact with the tissue. Simulations and experiments show a high level of vibration absorption. The first elastograms from the probe are also shown.

[1]  Nader Jalili,et al.  A Comparative Study and Analysis of Semi-Active Vibration-Control Systems , 2002 .

[2]  Hakan Elmali,et al.  Experimental Comparison of Delayed Resonator and PD Controlled Vibration Absorbers Using Electromagnetic Actuators , 1998, Vibration and Noise Control.

[3]  W. O’Brien,et al.  Young's modulus measurements of soft tissues with application to elasticity imaging , 1996, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[4]  Shankar P. Bhattacharyya,et al.  Robust Control: The Parametric Approach , 1995 .

[5]  B. G. Korenev,et al.  Dynamic Vibration Absorbers: Theory and Technical Applications , 1993 .

[6]  Osamu Nishihara,et al.  H2 optimization of three-element type dynamic vibration absorbers , 2002, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[7]  Katsuhiko Ogata,et al.  Modern Control Engineering , 1970 .

[8]  Jer-Nan Juang,et al.  Active vibration absorber for the CSI evolutionary model - Design and experimental results , 1991 .

[9]  N. Olgac,et al.  Optimum delayed feedback vibration absorber for MDOF mechanical structures , 1998, Proceedings of the 37th IEEE Conference on Decision and Control (Cat. No.98CH36171).

[10]  Jonathan Ophir,et al.  Elastography: Imaging the elastic properties of soft tissues with ultrasound , 2002, Journal of Medical Ultrasonics.

[11]  Jian-Qiao Sun,et al.  Passive, Adaptive and Active Tuned Vibration Absorbers—A Survey , 1995 .

[12]  W. Thomson.  Theory of vibration with applications , 1965 .

[13]  P. Bland,et al.  Quantitative tissue motion analysis of digitized M-mode images: gestational differences of fetal lung. , 1990, Ultrasound in medicine & biology.

[14]  S. A. Austin.  The Vibration Damping Effect of an Electrorheological Fluid , 1993 .

[15]  V. B. Venkayya,et al.  Simultaneous structural and control optimization via linear quadratic regulator eigenstructure assignment , 1987 .

[16]  Y. Chen,et al.  Active Vibration Control with State Feedback in Woodcutting , 2003 .

[17]  G Crosta.  Mathematical Review: MR2044619 (2005b:74051) Barbone, Paul E.; Gokhale, Nachiket H. Elastic modulus imaging: on the uniqueness and nonuniqueness of the elastography inverse problem in two dimensions , 2005 .