Photoacoustic imaging is an upcoming medical imaging modality with the potential of imaging both optical and
acoustic properties of objects. We present a measurement system and outline reconstruction methods to image
both speed of sound and acoustic attenuation distributions of an object using only pulsed light excitation. These
acoustic properties can be used in a subsequent step to improve the image quality of the optical absorption
distribution. A passive element, which is a high absorbing material with a small cross-section such as a carbon
fiber, is introduced between the light beam and the object. This passive element acts as a photoacoustic source
and measurements are obtained by allowing the generated acoustic signal to propagate through the object. From
these measurements we can extract measures of line integrals over the acoustic property distribution for both
the speed of sound and the acoustic attenuation. Reconstruction of the acoustic property distributions then
comes down to the inversion of a linear system relating the obtained projection measurements to the acoustic
property distributions. We show the results of applying our approach on phantom objects. Satisfactory results
are obtained for both the reconstruction of speed of sound and the acoustic attenuation.
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