Journal of the Acoustical Society of America, volume 120, issue 5, pages 2737-2745

Adaptive focusing for transcranial ultrasound imaging using dual arrays

F Vignon ^{1, 2}

J.-F. Aubry ²

M. Tanter ²

A. Margoum ²

M. Fink ²

Laboratoire Ondes et Acoustique, ESPCI, Université Paris VII, C.N.R.S U.M.R.7587, 10 rue Vauquelin, 75231 Paris, France.

Université Paris VII Laboratoire Ondes et Acoustique, ESPCI, , C.N.R.S U.M.R.7587, 10 rue Vauquelin, 75231 Paris Cedex 05, France

Publication type: Journal Article

Publication date: 2006-11-01

Acoustical Society of America (ASA)

Journal: Journal of the Acoustical Society of America

scimago Q1

SJR: 0.687

CiteScore: 4.6

Impact factor: 2.1

ISSN: 00014966, 15208524

DOI: 10.1121/1.2354073

Copy DOI

PubMed ID: 17139734

Acoustics and Ultrasonics

Arts and Humanities (miscellaneous)

Abstract

Ultrasonic brain imaging remains difficult and limited because of the strong aberrating effects of the skull (absorption, diffusion and refraction of ultrasounds): high resolution transcranial imaging would require adaptive focusing techniques in order to correct the defocusing effect of the skull. In this paper, a noninvasive brain imaging device is presented. It is made of two identical linear arrays of 128 transducers located on each side of the skull. It is possible to separate the respective influence of the two bone windows on the path of an ultrasonic wave propagating from one array to the other, and thus estimate at each frequency the attenuation and phase shift locally induced by each bone window. The information obtained on attenuation and phase is used to correct the wave fronts that have to be sent through the skull in order to obtain a good focusing inside the skull. Compared to uncorrected wave fronts, the spatial shift of the focal spot is corrected, the width of the focal spot is reduced, and the sidelobes level is decreased up to 17dB. Transcranial images of a phantom are presented and exhibit the improvement in image quality provided by this new noninvasive adaptive focusing method.

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Publisher

Acoustical Society of America (ASA)

Journal

Journal of the Acoustical Society of America

scimago Q1

SJR

0.687

CiteScore

4.6

Impact factor

2.1

ISSN

00014966 (Print)

15208524 (Electronic)

Adaptive focusing for transcranial ultrasound imaging using dual arrays

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