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9 July 2009 Ultrasound-transmission parameter imaging in a photoacoustic imager
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We present a 'hybrid' imaging system, which can image both optical absorption properties and acoustic transmission properties of an object in a two-dimensional slice using a computed tomography photoacoustic imager. The ultrasound transmission measurement method uses a strong absorber of light which is placed in the path of the light illuminating the sample. This acts as a source of ultrasound, whose interaction with the sample can be measured at the far-end of the sample using the same ultrasound detector used for photoacoustics. Such measurements are made at various angles around the sample in a computerized tomography approach. The ultrasound transients at the multi-element detector at all projections are analyzed for both times-of-arrival and amplitude. Using a fan-beam projection reconstruction algorithm we obtain hybrid images of optical absorption, speed-of-sound and acoustic attenuation. We validate the method on an appropriate phantom.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. Jose, R. Willemink, S. Resink, T. Maalderink, J. C. G. van Hespen, T. G. van Leeuwen, and S. Manohar "Ultrasound-transmission parameter imaging in a photoacoustic imager", Proc. SPIE 7371, Novel Optical Instrumentation for Biomedical Applications IV, 73710S (9 July 2009);

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