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Lett."],"published-print":{"date-parts":[[2026,10,1]]},"abstract":"<jats:p>We introduce quantitative scanned oblique back-illumination microscopy (qsOBM) for laser scanning microscopes (LSMs), enabling quantitative three-dimensional refractive index (RI) tomography in thick scattering samples. By exploiting the reciprocity of light scattering, the established camera-based qOBM reconstruction framework is extended to a scanning implementation. Experimentally, qsOBM is realized with a slide-mounted four-quadrant photodetector requiring only minimal optomechanical modification of a conventional LSM. We demonstrate quantitative RI imaging and multimodal qsOBM\/epi-detected second-harmonic generation (SHG) microscopy of type I collagen and adipose tissue in chicken muscle. 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All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.","name":"copyright","label":"Copyright"}]}}