<title>Coaxial acousto-optical tomography</title>
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説明
The proposed new method solves the problem that it is difficult to obtain high-resolution simultaneously in both x and y direction for an ultrasound -modulated optical tomographic 2-D image. In this method, incident laser and detector are coaxial to utilize the character of small lateral size of ultrasonic focused zone. An 860nm, 20mW laser is delivered by a fiber that passes the hole in the center of ultrasound transducer. It illuminated to a 20mm thick fat tissue with a buried object, a 5mm-wide colloidal cube, meanwhile ultrasound is focused to the sample. The scattering modulated photons are collected by an avalanche diode module, and then output signal is amplified and inputted to an oscilloscope with a FFT module. A 3D translation stage carried the sample moving to complete scanning. Combing with frequency swept ultrasound technology, the 2D tomographic images of different depth are obtained.© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
収録刊行物
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- SPIE Proceedings
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SPIE Proceedings 4597 59-64, 2001-10-25
SPIE