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Green’s function approach has been employed to compute photoacoustic (PA) field for a source with a Gaussian optical absorption profile. The PA field has been computed for a spherical absorber (diameter, d= 5.5 µm) and normal red blood cell (RBC) (d=7.65 µm) over a wide range of frequency band (10-1000 MHz).The RBC contour was theoretically generated by the Cassinian oval model. The standard deviation (SD) of optical absorption coefficient was varied according to the diameter of both the objects and the integration for obtaining PA field was carried out numerically. The PA field at an angle of 45° from the direction of symmetry axis was evaluated. It was observed that for a spherical absorber the first minimum shifts from 510 to 390 MHz as the SD varies from 1.37 to 11 µm. Similarly, for RBC the first minimum moves from 520 to 350 MHz when SD increases from 1.91 to 15.30 µm. This paper demonstrates that the spatial distribution of optical absorption coefficient dictates PA spectral properties.
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