Analysis of 2-D motion tracking in ultrasound with dual transducers |
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Authors: | Abeysekera Jeffrey M Zahiri Azar Reza Goksel Orcun Rohling Robert Salcudean Septimiu E |
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Institution: | a Department of Mechanical Engineering, University of British Columbia, Vancouver, BC, Canada b Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, BC, Canada |
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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 (5 MHz) and experiments (10 MHz) 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 3.9 μm compared to 9 μm with angular compounding. Simulation of dual transducer misalignment of 1 mm and 2° result in errors of less than 9 μm. 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. |
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Keywords: | Displacement Dual transducer Elastography Motion tracking |
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