{"authors":[{"id":"orcid_______::37062dc3373dc25dc032838e60522bd6","fullName":"Wojciech Krauze","name":"Wojciech","surname":"Krauze","rank":1,"pid":{"id":{"scheme":"orcid","value":"0000-0002-5248-3986"},"provenance":null}},{"id":null,"fullName":"Martyna Mazur","name":"Martyna","surname":"Mazur","rank":2,"pid":{"id":{"scheme":"orcid_pending","value":"0000-0002-7386-4243"},"provenance":null}},{"id":null,"fullName":"Arkadiusz Kuś","name":"Arkadiusz","surname":"Kuś","rank":3,"pid":{"id":{"scheme":"orcid_pending","value":"0000-0001-8009-4841"},"provenance":null}},{"id":null,"fullName":"Aleksandra Piekarska","name":"Aleksandra","surname":"Piekarska","rank":4,"pid":null}],"openAccessColor":"gold","publiclyFunded":false,"eoscIfGuidelines":null,"type":"publication","language":{"code":"eng","label":"English"},"countries":null,"subjects":[{"subject":{"scheme":"FOS","value":"0103 physical sciences"},"provenance":null},{"subject":{"scheme":"FOS","value":"01 natural sciences"},"provenance":null},{"subject":{"scheme":"keyword","value":"Article"},"provenance":null}],"mainTitle":"qtOCT: quantitative transmission optical coherence tomography","subTitle":null,"descriptions":["<jats:p>Transmission optical coherence tomography (OCT) enables analysis of biological specimens in vitro through the detection of forward-scattered light. Up to now, transmission OCT has been considered a technique that cannot directly retrieve quantitative phase and is thus a qualitative method. In this paper, we present qtOCT, a novel quantitative transmission optical coherence tomography method. Unlike existing approaches, qtOCT allows for a direct, easy, fast, and rigorous retrieval of 2D integrated phase information from transmission full-field swept-source OCT measurements. Our method is based on coherence gating and allows user-defined temporal measurement range selection, making it potentially suitable for analyzing multiple-scattering samples. In the weak-scattering regime, we demonstrate high consistency between qtOCT and digital holographic microscopy phase images, whereas in the multiple-scattering regime, we show the superiority of qtOCT. 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