The photoacoustic pressure is equal to the Gruneisen parameter times the absorption coefficient times the fluence.
The absorption coefficient is a logarithm, logarithms are added not multiplied, how can it be used like this?
The equation in a more readable form is in the attached scanned image.
Dear Henry Savage,
Although absorption coefficient is defined in terms of a logarithmic expression, in Photoacoustic Tomography it is the quantity of interest, found by solving the inverse problem. Photoacoustic pressure is what you measure and fluence is estimated by photon-migration modelling. Absorption coefficient is considered as the quantity of interest and is spatially varying.
Or, more simply stated, once a logarithm is computed you can multiply that result by whatever you wish.
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