Speed-of-sound imaging in a photoacoustic imager


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Manohar, Srirang and Willemink, Rene G.H. and Leeuwen, Ton G. van (2007) Speed-of-sound imaging in a photoacoustic imager. In: Eighth Conference on Biomedical Thermoacoustics, Optoacoustics, and Acousto-optics; Photons Plus Ultrasound: Imaging and Sensing, 13-15 February 2007, San Jose, CA, USA (pp. p. 64370).

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Abstract:The effects of an inappropriately chosen speed-of-sound in photoacoustic imaging reconstructions are to cause blurring of images and impairment of contrast. Here we outline a new methodology to measure the speed-of-sound in a photoacoustic imager with little or no additional cost and without the need to perform extra measurements. The 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. This yields time-of-arrival measurements of the ultrasound transient at the multi-element detector. Such measurements are made at various angles around the sample in a computerized tomography approach. Reconstruction of the time-of-arrival or speed-of-sound tomogram of the object can be made by implementing a fan-beam projection reconstruction algorithm. We present the concept and validate the method on a speed-of-sound phantom.
Item Type:Conference or Workshop Item
Copyright:© 2007 SPIE
Faculty:
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/62179
Official URL:http://dx.doi.org/10.1117/12.700078
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