Focused array transducer for optoacoustic tomography

Author

Pelivanov, Ivan ; Kozhushko, Viktor ; Khokhlova, Tanya ; Zharinov, Alexei ; Karabutov, Alexander

Author_Institution

Int. Laser Center, Moscow State Univ., Russia

Volume

3

fYear

2004

fDate

23-27 Aug. 2004

Firstpage

1840

Abstract

Optoacoustic (OA) imaging is based on the generation of thermoelastic stress waves by heating an object in an optically heterogeneous medium with a short laser pulse. The stress waves contain information on the distribution of structures with preferential optical absorption that can be used for early cancer diagnostics. In this work a new design of array transducer is proposed and different characteristics of the array are discussed. The array consists of 64 focused piezo-elements made of PVDF slabs imposed on a spherical surface. Resolution yielded by the array in different directions is determined and discussed. Numerical modeling is performed for optimization of tissue irradiation conditions, determination of contrast of the OA images and maximum imaging depth.

Keywords

acoustic tomography; acousto-optical signal processing; biological tissues; biomedical transducers; cancer; piezoelectric transducers; thermoelasticity; ultrasonic focusing; ultrasonic imaging; ultrasonic transducer arrays; PVDF slabs; array transducer; early cancer diagnostics; focused array transducer; focused piezo-elements; maximum imaging depth; optically heterogeneous medium; optoacoustic imaging; optoacoustic tomography; short laser pulse; thermoelastic stress waves; tissue irradiation conditions; Absorption; Cancer; Focusing; Heating; Optical imaging; Optical pulse generation; Thermal stresses; Thermoelasticity; Tomography; Transducers;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 2004 IEEE

ISSN

1051-0117

Print_ISBN

0-7803-8412-1

Type

conf

DOI

10.1109/ULTSYM.2004.1418187

Filename

1418187