Open AccessOptical dosimeter for selective retinal therapy based on multi-port fiber-optic interferometry
Author(s) -
Uihan Kim,
Minsung Kwon,
Gyeongyeon Jung,
Youngnam Kim,
Yunam Lee,
Sang Hee Im,
Barry Cense,
Hyungsuk Lee,
WonSuk Ohm,
Chulmin Joo
Publication year - 2021
Publication title -
biomedical optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.362
H-Index - 86
ISSN - 2156-7085
DOI - 10.1364/boe.434812
Subject(s) - retinal , pulse (music) , optics , interferometry , optical fiber , sensitivity (control systems) , retina , computer science , biomedical engineering , medicine , ophthalmology , physics , electronic engineering , detector , engineering
Selective retinal therapy (SRT) employs a micro-second short-pulse lasers to induce localized destruction of the targeted retinal structures with a pulse duration and power aimed at minimal damage to other healthy retinal cells. SRT has demonstrated a great promise in the treatment of retinal diseases, but pulse energy thresholds for effective SRT procedures should be determined precisely and in real time, as the thresholds could vary with disease status and patients. In this study, we present the use of a multi-port fiber-based interferometer (MFI) for highly sensitive real-time SRT monitoring. We exploit distinct phase differences among the fiber ports in the MFI to quantitatively measure localized fluctuations of complex-valued information during the SRT procedure. We evaluate several metrics that can be computed from the full complex-valued information and demonstrate that the complex contour integration is highly sensitive and most correlative to pulse energies, acoustic outputs, and cell deaths. The validity of our method was demonstrated on excised porcine retinas, with a sensitivity and specificity of 0.92 and 0.88, respectively, as compared with the results from a cell viability assay.