## What is/are Quantitative Photoacoustic?

Quantitative Photoacoustic - Quantitative photoacoustic (PA) tomography aims to recover absolute chromophore concentrations from multiwavelength PA images.^{[1]}

## optical absorption coefficient

When using quantitative photoacoustic tomography (q-PAT) reconstruction to recover the optical absorption coefficients of tissue, the commonly used diffusion equation has several limitations in the case of the objects that have small geometries and high-absorption or low-scattering areas.^{[1]}Objective: A photoacoustic signal is proportional to the product of the optical absorption coefficient and the local light fluence; quantitative photoacoustic measurements of the optical absorption coefficients, therefore, require an accurate compensation of optical fluence variation.

^{[2]}OBJECTIVE A photoacoustic signal is proportional to the product of the optical absorption coefficient and the local light fluence; quantitative photoacoustic measurements of the optical absorption coefficients, therefore, require an accurate compensation of optical fluence variation.

^{[3]}A photoacoustic signal is proportional to a product of optical absorption coefficient and local light fluence; quantitative photoacoustic measurements of the optical absorption coefficients therefore require an accurate compensation of optical fluence variations.

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## quantitative photoacoustic tomography

When using quantitative photoacoustic tomography (q-PAT) reconstruction to recover the optical absorption coefficients of tissue, the commonly used diffusion equation has several limitations in the case of the objects that have small geometries and high-absorption or low-scattering areas.^{[1]}Significance: Recovering accurate oxygenation estimations in the breast with quantitative photoacoustic tomography (QPAT) is not straightforward.

^{[2]}Quantitative photoacoustic tomography aims to recover maps of the local concentrations of tissue chromophores from multispectral images.

^{[3]}By reconstructing the optical properties such as the absorption coefficient, quantitative photoacoustic tomography (QPAT) images the micro blood vessels and the hemoglobin concentration quantitatively.

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## quantitative photoacoustic measurement

Objective: A photoacoustic signal is proportional to the product of the optical absorption coefficient and the local light fluence; quantitative photoacoustic measurements of the optical absorption coefficients, therefore, require an accurate compensation of optical fluence variation.^{[1]}OBJECTIVE A photoacoustic signal is proportional to the product of the optical absorption coefficient and the local light fluence; quantitative photoacoustic measurements of the optical absorption coefficients, therefore, require an accurate compensation of optical fluence variation.

^{[2]}A photoacoustic signal is proportional to a product of optical absorption coefficient and local light fluence; quantitative photoacoustic measurements of the optical absorption coefficients therefore require an accurate compensation of optical fluence variations.

^{[3]}

## quantitative photoacoustic imaging

Motivated by applications in quantitative photoacoustic imaging, we study inverse problems to a semilinear radiative transport equation (RTE) where we intend to reconstruct absorption coefficients in the equation from single and multiple internal data sets.^{[1]}Tissue heterogeneities and the presence of strong optical absorbers hinder the applications of quantitative photoacoustic imaging (PA).

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