Application of the correlation method to the acoustic thermograph with focused antenna

Alexander M. Reyman; Eugene V. Krotov; Anatoly D. Mansfeld

doi:10.1117/12.429296

15 June 2001 Application of the correlation method to the acoustic thermograph with focused antenna

Alexander M. Reyman, Eugene V. Krotov, Anatoly D. Mansfeld

Proceedings Volume 4256, Biomedical Optoacoustics II; (2001) https://doi.org/10.1117/12.429296
Event: BiOS 2001 The International Symposium on Biomedical Optics, 2001, San Jose, CA, United States

Abstract

The acoustical thermovision (AT) method is based on the passive registration of thermal acoustical noise by ultrasonic antenna integrating signal over its receiving field. This method allows to find overheated object and measure its temperature contrast over surrounding medium. Various scanning and tomographic algorithms can be used to improve spatial resolution. One of the possible ways is to use focused antenna selecting signal from its focal area, but the localization quality strongly depends on the object transversal size. To reduce this bottleneck we can use the correlation processing from two focused antennae with combined focal areas. The spatial resolutions of AT with focused antenna and the correlation AT with two focused antennae were compared for various objects. The dependence of device output on the distance between antenna and object in both cases was calculated. The intensity maximum of emission received by the correlation AT is localized near antenna focus. Scanning this focal area across an object allows one to obtain spatial images. The 2D images of medium with inhomogeneous temperature distribution were calculated and the efficiency of correlation method was demonstrated. Thus correlation AT method provides new diagnostically significant information and allows us to approach to clinical application. This work was supported by RFBR (project #00-02-16600).

Citation Download Citation

Alexander M. Reyman, Eugene V. Krotov, and Anatoly D. Mansfeld "Application of the correlation method to the acoustic thermograph with focused antenna", Proc. SPIE 4256, Biomedical Optoacoustics II, (15 June 2001); https://doi.org/10.1117/12.429296

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