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- W2916846169 abstract "Angular distribution of a differential photoacoustic cross-section (DPACS) has been examined for various nonspherical axisymmetric particles. The DPACS as a function of measurement angle has been computed for spheroidal particles with varying aspect ratios and fitted with a tri-axes ellipsoid form factor model to extract shape parameters. Similar study has been carried out for normal and pathological red blood cells, and fitting has been performed with the tri-axes ellipsoid and finite cylinder form factor models to evaluate cellular morphology. It is found that an enhancement of the DPACS occurs as the surface area of the photoacoustic source normal to the direction of measurement is increased. It decreases as the thickness of the source along the same direction increases. For example, the DPACS for normal erythrocyte along the direction of symmetry is nearly 20 times greater than a pathological cell. Further, the first minimum appears slightly later (≈4°) for a healthy cell compared with that of a diseased cell. Shape information of spheroids can be precisely estimated by the first model. Both models provide accurate estimates of shape parameters for normal red blood cells (errors within 4%). It may be possible to assess cellular morphology from an angular profile of the DPACS using form factor models." @default.
- W2916846169 created "2019-03-02" @default.
- W2916846169 creator A5025453146 @default.
- W2916846169 creator A5054063916 @default.
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- W2916846169 date "2019-02-22" @default.
- W2916846169 modified "2023-10-16" @default.
- W2916846169 title "Study on angular distribution of differential photoacoustic cross-section and its implication in source size determination" @default.
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- W2916846169 doi "https://doi.org/10.1364/josaa.36.000387" @default.
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