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Pubmed for Handhelds

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  • Title: Subsample interpolation strategies for sensorless freehand 3D ultrasound.
    Author: Housden RJ, Gee AH, Treece GM, Prager RW.
    Journal: Ultrasound Med Biol; 2006 Dec; 32(12):1897-904. PubMed ID: 17169701.
    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.
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