Subsample interpolation strategies for sensorless freehand 3D ultrasound |
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Authors: | Housden R James Gee Andrew H Treece Graham M Prager Richard W |
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Affiliation: | aUniversity of Cambridge, Department of Engineering, Trumpington Street, Cambridge CB2 1PZ, UK |
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Abstract: | Freehand 3D ultrasound can be acquired without a position sensor by deducing the elevational probe motion from the interframe speckle decorrelation. However, a freehand scan involves lateral and axial, as well as elevational, probe motion. The lateral sampling is determined by the A-line separation and is relatively sparse: lateral motion tracking therefore requires subsample interpolation. In this paper, we investigate the resilience of lateral interpolation techniques to simultaneous lateral and elevational probe motion. We propose a novel interpolation strategy and, through a series of in vitro experiments, compare its performance with that of established alternatives. The new technique is shown to be superior, limiting interpolation errors to around 5% of the length of the freehand reconstruction. (E-mail: rjh80@eng.cam.ac.uk) |
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Keywords: | 3D ultrasound Subsample interpolation Speckle decorrelation |
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