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• W2013455802 endingPage "26" @default.
• W2013455802 startingPage "19" @default.
• W2013455802 abstract "A fibre optic probe and compact light detection system has been used to monitor the fluence-rate at the tissue surface during 5-aminolaevulinic acid based photodynamic therapy (PDT) of Barrett's oesophagous. The contributions from three specific wavelengths were recorded, corresponding to the combination of therapeutic laser light and fluorescence emission from protoporphyrin IX (635 nm), the fluorescence from an oxidation product of the photosensitiser (670 nm), and the protoporphyrin IX fluorescence alone (705 nm). We have found that light scattering results in an enhancement of the therapeutic fluence-rate, and hence light dose, by approximately 70%. At the onset of therapy the fluorescence provides a 10% contribution to the overall fluence-rate at 635 nm. The dynamics of photosensitiser bleaching could be extracted from the depletion in light signals. By defining a bleaching dose as the 635 nm light fluence delivered over the period during which the photosensitiser fluorescence decays to 1/e3 of its initial value, we find that the average ratio of bleaching to total dose is 33%. Further, the fluorescence contributes approximately 5% of the bleaching light dose. These results suggest that the prescribed period of therapeutic light exposure may be reduced with no loss in clinical efficacy, but with a consequent improvement in patient tolerance to this therapy." @default.
• W2013455802 created "2016-06-24" @default.
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• W2013455802 date "2006-03-01" @default.
• W2013455802 modified "2023-09-26" @default.
• W2013455802 title "Light dosimetry measurements during ALA-PDT of Barrett's oesophagus" @default.
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• W2013455802 doi "https://doi.org/10.1016/s1572-1000(05)00155-9" @default.
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