Transcranial shear-mode ultrasound imaging Characterization of Point Spread Function and assessment of excitation techniques

Author

Yousefi, Ali ; Hynynen, Kullervo

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Toronto, Toronto, ON

fYear

2008

fDate

2-5 Nov. 2008

Firstpage

1359

Lastpage

1362

Abstract

This study presents work on an imaging technique that utilizes shear-wave propagation through the skull. The pulse-echo point spread functions (PSF) were obtained by imaging a point scatterer behind ex vivo human craniums at 1 MHz. Brightness images of the target obtained with either shear-mode or conventional longitudinal-mode transmission in the bone were assessed to quantify distortions to the PSF. The signal-to-noise ratio (SNR) limitations introduced by severe attenuation of shear-waves in the skull were overcome with frequency modulated (FM) coded excitations.

Keywords

bioacoustics; biomechanics; biomedical ultrasonics; bone; brain; optical transfer function; orthopaedics; ultrasonic propagation; PSF; bone; ex vivo human craniums; excitation techniques; frequency 1 MHz; point scatterer; pulse-echo point spread function; shear-wave attenuation; shear-wave propagation; signal-to-noise ratio; skull; transcranial shear-mode ultrasound imaging; Attenuation; Bones; Brightness; Cranium; Frequency modulation; Humans; Scattering; Signal to noise ratio; Skull; Ultrasonic imaging; Brain; Diagnosis; Imaging; Shear waves;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 2008. IUS 2008. IEEE

Conference_Location

Beijing

Print_ISBN

978-1-4244-2428-3

Electronic_ISBN

978-1-4244-2480-1

Type

conf

DOI

10.1109/ULTSYM.2008.0329

Filename

4803452