Title: Numerical investigation of non-linear propagation of amplitude-modulated ultrasound pulses in human soft tissues and superharmonic beam optimisation

Authors: Narendra D. Londhe; R.S. Anand

Addresses: Department of Electrical Engineering, Indian Institute of Technology Roorkee, Roorkee, India. ' Department of Electrical Engineering, Indian Institute of Technology Roorkee, Roorkee, India

Abstract: The concept of Superharmonic Imaging (SHI) evolved because of non-linear propagation of ultrasound in biological. In this work, the comparison of fundamental, second and superharmonic components are presented, which is associated with amplitude and propagation distance along on-axis and off-axis as well. The parameters associated with imaging quality are: lateral and axial resolutions; depth of field and Signal to Noise Ratio (SNR). The trade-offs among above-mentioned four aspects of fundamental, second harmonic and superharmonic fields and relating them to system parameters such as aperture size, f-number, focal depth, central frequency and applied pressure help in superharmonic beam optimisation, which further enhances imaging ability.

Keywords: harmonic imaging; superharmonic beam optimisation; KZK equation; soft tissue; ultrasound pulses; biomedical technology.

DOI: 10.1504/IJBET.2012.045359

International Journal of Biomedical Engineering and Technology, 2012 Vol.8 No.1, pp.82 - 98

Published online: 12 Dec 2014 *

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