Ultrasound imaging based on nonlinear pressure field properties
作者:
Ayache Bouakaz,
Peter J. A. Frinking,
Nico de Jong,
期刊:
AIP Conference Proceedings
(AIP Available online 1900)
卷期:
Volume 524,
issue 1
页码: 487-490
ISSN:0094-243X
年代: 1900
DOI:10.1063/1.1309270
出版商: AIP
数据来源: AIP
摘要:
Ultrasound image quality has experienced a significant improvement over the past years with the utilization of harmonic frequencies. This brings the need to understand the physical processes involved in the propagation of finite amplitude sound beams, and the issues for redesigning and optimizing the phased array transducers. New arrays with higher imaging performances are essential for tissue imaging and contrast imaging as well. This study presents measurements and simulations on a 4.6 MHz square transducer. The numerical scheme used solves the KZK equation in the time domain. Comparison of measured and computed data showed good agreement for low and high excitation levels. In a similar way, a numerical simulation was performed on a linear array with five elements. The simulation showed that the second harmonic beam is narrower than the fundamental with less energy in the near field. In addition, the grating lobes are significantly lower. Accordingly, selective harmonic imaging shows less near field artifacts and will lower the clutter, resulting in much cleaner images. ©2000 American Institute of Physics.
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