title: Subsample interpolation strategies for sensorless freehand 3D ultrasound.
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.
authors.affiliation: University of Cambridge, Department of Engineering, Trumpington Street, Cambridge CB2 1PZ, UK. rjh80@eng.cam.ac.uk
authors.forename: R James
authors.initials: RJ
authors.lastname: Housden
authors.forename: Andrew H
authors.initials: AH
authors.lastname: Gee
authors.forename: Graham M
authors.initials: GM
authors.lastname: Treece
authors.forename: Richard W
authors.initials: RW
authors.lastname: Prager
mesh_terms: D000465:Algorithms; D016477:Artifacts; D007091:Image Processing, Computer-Assisted / Q000379:methods; D021621:Imaging, Three-Dimensional / Q000379:methods*; D009038:Motion; D016011:Normal Distribution; D019047:Phantoms, Imaging; D014159:Transducers; D014465:Ultrasonics; D014463:Ultrasonography / Q000379:methods*