Physics - Conference Items
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Item Time resolved SPAD micro-camera probe for wide-field FLIm in microendoscopy(Society of Photo‑Optical Instrumentation Engineers (SPIE), 2023-03-06) Angelone, Dario; Konugolu Venkata Sekar, Sanathana; Messina, Walter; Matheson, Andrew B.; Erdogan, Ahmet T.; Henderson, Robert K.; Burke, Ray; Andersson-Engels, Stefan; James W. Tunnell; Horizon 2020; Science Foundation Ireland; EPSRC Interdisciplinary Research CollaborationWe propose a handheld single photon avalanche diode (SPAD) micro-camera probe for wide-field in-vivo fluorescence lifetime imaging (FLIm) applications. The presented probe includes a novel 3D stacked 1.4 mm × 1.4 mm SPAD array, an integrated excitation light source, and imaging optics. The spatial and temporal performance of the integrated system was characterised using a USAF test target and range of fluorescence lifetime beads.Item Investigation of lung volume measurements in neonates using gas in scattering media absorption spectroscopy(Optica Publishing Group, 2022-04) Pacheco, Andrea; Jayet, Bapiste; Grygoryev, Konstantin; Messina, Walter; Dehghani, Hamid; Krite Svanberh, Emilie; Dempsey, Eugene M.; Andersson-Engels, Stefan; Science Foundation IrelandWe perform phantom and numerical studies of the changes in molecular oxygen and water vapor spectroscopic signals, showing the potential of measuring pulmonary volume changes with GASMAS technique in neonates.Item Theoretical modelling of modulation depth of acoustic optical imaging at varying mechanical properties(Optica Publishing Group, 2022-04) Gunther, Jacqueline; Jayet, Baptiste; Amissah, Michael; Andersson-Engels, Stefan; Science Foundation IrelandThe signal from acousto-optical imaging is affected by the mechanical properties of a sample. A theoretical model showed that speed of sound, density, peizooptical coefficient, and acoustic amplitude affect modulation depth.Item Wavelength selection using diffuse reflectance spectra and machine learning algorithms for tissue differentiation in orthopedic surgery(Optica Publishing Group, 2022-04) Li, Celina L.; Fisher, Carl J.; Komolibus, Katarzyna; Grygoryev, Konstantin; Burke, Ray; Andersson-Engels, StefanDRS-based measurements of tissue types encountered in orthopedic surgery are utilized to establish a wavelength selection methodology using machine learning techniques, which enables rapid development of clinically translatable optical systemsItem Non-invasive lung oxygen monitoring in term infants: a pilot trial(Optica Publishing Group, 2022-04) Panaviene, Jurate; Grygoryev, Konstantin; Pacheco, Andrea; Dempsey, Eugene M.; Andersson-Engels, Stefan; Science Foundation IrelandEmploying non-invasive GASMAS based system, lung oxygen measurements were performed on 25 healthy term infants on various chest positions. Oxygen and water vapor absorption signal was detected on most occasions.