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Proceedings Paper

Experimental evaluation of noise generated by grating lobes for a sparse 3D ultrasound computer tomography system
Author(s): Nicole V. Ruiter; Michael Zapf; Torsten Hopp; Hartmut Gemmeke
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Paper Abstract

3D ultrasound computer tomography (USCT) requires a large number of transducers approx. two orders of magnitude larger than in a 2D system. Technical feasibility limits the number of transducer positions to a much smaller number resulting in a sparse aperture and causing artifacts due to grating lobe effects in the images. Usually, grating lobes are suppressed by using a non-sparse geometry. Thus, there is no quantitative estimation method available how much the image contrast is degraded when a sparse aperture is applied and how much the contrast is improved when adding more transducers, changing the overall aperture or the object. In this paper the effect of the grating lobes on the image quality was analyzed for a spherical, a hemispherical and the semi-ellipsoidal USCT aperture: The background noise due to grating lobes is very similar for the three apertures and mainly influenced by the sparseness and the imaged object. A model for noise reduction was fitted to simulated and experimental data, and can be used to predict the peak-signal-to-noise- ratio for a given object and number of aperture positions.

Paper Details

Date Published: 29 March 2013
PDF: 8 pages
Proc. SPIE 8675, Medical Imaging 2013: Ultrasonic Imaging, Tomography, and Therapy, 86750N (29 March 2013); doi: 10.1117/12.2008197
Show Author Affiliations
Nicole V. Ruiter, Karlsruher Institut für Technologie (Germany)
Michael Zapf, Karlsruher Institut für Technologie (Germany)
Torsten Hopp, Karlsruher Institut für Technologie (Germany)
Hartmut Gemmeke, Karlsruher Institut für Technologie (Germany)

Published in SPIE Proceedings Vol. 8675:
Medical Imaging 2013: Ultrasonic Imaging, Tomography, and Therapy
Johan G. Bosch; Marvin M. Doyley, Editor(s)

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