OPUS - Optoacoustic imaging combined with conventional ultrasound for breast cancer detection

被引:3
|
作者
Haisch, C. [1 ]
Zell, K. [1 ]
Sperl, J. I. [2 ]
Ketzer, S. [2 ]
Vogel, M. W. [2 ]
Menzenbach, P. [3 ]
Niessner, R. [1 ]
机构
[1] Univ Munich, Chair Analyt Chem, Marchioninistr 17, D-81377 Munich, Germany
[2] GE Global Res, D-85748 Garching, Germany
[3] InnoLas GmbH, D-82152 Krailling, Germany
关键词
photoacoustic; optoacoustic; add-on system;
D O I
10.1117/12.727971
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Besides x-ray imaging, sonography is the most common method for breast cancer screening. The intention of our work is to develop optoacoustical imaging as an add-on to a conventional system. While ultrasound imaging reveals acoustical properties of tissue, optoacoustics generates an image of the distribution of optical absorption. Hence, it can be a valuable addition to sonography, because acoustical properties of different tissues show only a slight variation whereas the optical properties may differ strongly. Additionally, optoacoustics gives access to physiological parameters, like oxygen saturation of blood. For the presented work, we combine a conventional ultrasound system to a 100 Hz laser. The laser system consists of a Nd:YAG-laser at a wavelength of 532 nm with 7 ns pulse duration, coupled to a tunable Optical Parametric Oscillator (OPO) with a tuning rage from 680 nm to 2500 nm. The tunable laser source allows the selection of wavelengths which compromising high spectral information content with high skin transmission. The laser pulse is delivered fiber-optically to the ultrasound transducer and coupled into the acoustical field of view. Homogeneous illumination is crucial in order to achieve unblurred images. Furthermore the maximum allowed pulse intensities in accordance with standards for medical equipment have to be met to achieve a high signal to noise ration. The ultrasound instrument generates the trigger signal which controls the laser pulsing in order to apply ultrasound instrument's imaging procedures without major modifications to generate an optoacoustic image. Detection of the optoacoustic signal as well as of the classical ultrasound signal is carried out by the standard medical ultrasound transducer. The characterization of the system, including quantitative measurements, performed on tissue phantoms, is presented. These phantoms have been specially designed regarding their acoustical as well as their optical properties.
引用
收藏
页数:14
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