NDLI: Implementation of tissue harmonic synthetic aperture imaging on a commercial ultrasound system

Content Provider	IEEE Xplore Digital Library
Author	Rasmussen, J.H. Hemmsen, M.C. Madsen, S.S. Hansen, P.M. Nielsen, M.B. Jensen, J.A.
Copyright Year	2012
Description	Author affiliation: Dept. of Radiol., Rigshospitalet, Copenhagen, Denmark (Madsen, S.S.; Hansen, P.M.; Nielsen, M.B.) \|\| Dept. of Elec. Eng., Tech. Univ. of Denmark, Lyngby, Denmark (Rasmussen, J.H.; Hemmsen, M.C.; Jensen, J.A.)
Abstract	This paper presents an imaging technique for synthetic aperture (SAI) tissue harmonic imaging (THI) on a commercial ultrasound system. Synthetic aperture sequential beamforming (SASB) is combined with a pulse inversion (PI) technique on a commercial BK 2202 UltraView system. An interleaved scan sequence that performs dynamic receive focused (DRF) imaging and SASB, both using PI, is implemented. From each acquisition four images can be created: DRF image, SASB image, tissue harmonic DRF image (DRF-THI), and tissue harmonic SASB image (SASB-THI). For SASB imaging, a fixed transmit and receive focus at 80 mm and an F# of 3 is applied. For DRF imaging, default scanner settings are used, which are a focus at 85 mm and F# of 5.7 in transmit and a dynamic receive aperture with an F# of 0.8. In all cases a 2.14 MHz one-and-a-half cycle excitation transmit waveform is used. A BK 8820e 192 element convex array transducer is used to conduct scans of wire phantoms. The -6 dB and -20 dB lateral resolution is measured for each wire in the phantom. Results show that the -6 dB lateral resolution for SASB-THI is as good as for DRF-THI except at the point of the virtual source. SASB-THI even shows 7% reduction in -6 dB lateral resolution for the deepest wire at 100 mm. The -20 dB resolution for SASB-THI at [25, 50, 75, 100] mm was reduced by [5, 0 -34, 11] % compared to DRF-THI, which shows, that except for the point of the virtual source, the lateral resolution was improved by SASB-THI. A successful implementation of SASB-THI was achieved on a commercial system, which can be used for future pre-clinical trials.
Starting Page	121
Ending Page	125
File Size	309177
Page Count	5
File Format	PDF
ISBN	9781467345613
ISSN	19485719
e-ISBN	9781467345620
DOI	10.1109/ULTSYM.2012.0030
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-10-07
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Imaging Image resolution Harmonic analysis Wires Ultrasonic imaging Apertures Array signal processing
Content Type	Text
Resource Type	Article

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