title: Analysis of 2-D motion tracking in ultrasound with dual transducers.
abstract: We study displacement and strain measurement error of dual transducers (two linear arrays, aligned orthogonally and coplanar). Displacements along the beam of each transducer are used to obtain measurements in two-dimensions. Simulations (5MHz) and experiments (10MHz) are compared to measurements with a single linear array, with and without angular compounding. Translation simulations demonstrate factors of 1.07 larger and 8.0 smaller biases in the axial and lateral directions respectively, for dual transducers compared to angular compounding. As the angle between dual transducers decreases from 90° to 40°, for 1% compression simulations, the lateral RMS error ranges from 2.1 to 3.9μm compared to 9μm with angular compounding. Simulation of dual transducer misalignment of 1mm and 2° result in errors of less than 9μm. Experiments demonstrate factors of 3.0 and 5.2 lower biases for dual transducers in the axial and lateral directions respectively compared to angular compounding.
authors: Department of Mechanical Engineering, University of British Columbia, Vancouver, BC, Canada. jeffa@ece.ubc.ca
authors: Jeffrey M
authors: JM
authors: Abeysekera
authors: Reza
authors: R
authors: Zahiri Azar
authors: Orcun
authors: O
authors: Goksel
authors: Robert
authors: R
authors: Rohling
authors: Septimiu E
authors: SE
authors: Salcudean
mesh_terms: D002138:Calibration; D003198:Computer Simulation; D054459:Elasticity Imaging Techniques / Q000295:instrumentation* / Q000379:methods*; D020342:Finite Element Analysis; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D019047:Phantoms, Imaging; D014159:Transducers; D016217:Ultrasonography, Mammary / Q000295:instrumentation* / Q000379:methods*