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SM Journal of Biomedical Engineering

Effect of Frequency and Focal Depth of Push Pulses on Acoustic Intensity, Mechanical Index, and Shear Wave Amplitude for Elastography Imaging

[ ISSN : 2573-3702 ]

Abstract
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Received: 13-Jan-2017

Accepted: 27-Feb-2017

Published: 02-Mar-2017

Research Article | Volume 3 - Issue 2 | Article DOI :

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Seyedali Sadeghi¹, Sean Rothenberger¹, Dooman Akbarian¹, and Daniel H Cortes¹,²*

¹Department of Mechanical Engineering, Pennsylvania State University, USA
²Department of Biomedical Engineering, Pennsylvania State University, USA

Corresponding Author:

Daniel H Cortes, Department of Biomedical Engineering and Mechanical Engineering, Pennsylvania State University, University Park, USA; Tel: 814-863-3103; E-mail: dhc13@psu.edu

Keywords

Ultrasound shear wave elastography; Push pulse methods; FDA parameters; Shear waves; Axial particle velocity

Abstract

Over the past few years, there has been an increase on the application of Shear Wave Elastography (SWE) techniques to measure mechanical properties of musculoskeletal tissues for clinical applications. Imaging soft musculoskeletal tissues often requires the use of high frequency probes for high resolution at lower depths. The objective of this study is to measure the effect of frequency and focal depth on the acoustic output parameters (ISPPA , ISPTA and MI) as well as the amplitude of the generated shear waves by a ‘push’ pulse. To do this, acoustic output parameters were measured following NEMA guidelines. The frequency range used for the push pulses was 5-10MHz. The effect of frequency and focal depth on the amplitude of shear waves was evaluated on ultrasound phantom as well as on muscle and Achilles tendon. Acoustic output parameters and shear wave amplitude decreased as function of focal depth. However, the maximum acoustical intensity and the maximum displacement occurred at different frequencies. The maximum acoustic intensity was found at the center frequency of the transducer. These results shed light into the relationships between the properties of the ultrasound probe, acoustic output parameters, and shear wave amplitude for elastography applications.

Citation

Sadeghi S, Rothenberger S, Akbarian D and Cortes DH. Effect of Frequency and Focal Depth of Push Pulses on Acoustic Intensity, Mechanical Index, and Shear Wave Amplitude for Elastography Imaging. SM J Biomed Eng. 2017; 3(2): 1015.