Biology subjects

Kontenis, L.

Publications and source records attributed to Kontenis, L..

3 recordsLinked to original sources

bioRxiv2022

Wide-Field Stokes Polarimetric Microscopy for Second Harmonic Generation Imaging

We employ wide-field second harmonic generation (SHG) microscopy together with nonlinear Stokes polarimetry for quick ultrastructural investigation of large sample areas (700 m x 700 m) in thin histology sections. The Stokes vector components for SHG are obtained from the polarimetric measurements with incident and outgoing linear and circular polarization states. The Stokes components are used to construct the images of polarimetric parameters and deduce the sample maps of achiral and chiral nonlinear susceptibility tensor components ratios and cylindrical axis orientation in fibrillar materials. The imaged histology sections with polarimetric wide-field SHG microscopy provide large area maps of ultrastructural information about the collagenous tissue, which can be used for rapid histology investigations.

biophysics↗

bioRxiv2022

Wide-Field Multicontrast Nonlinear Microscopy for Histopathology

A multicontrast polarimetric wide-field second harmonic generation (SHG) and multiphoton excitation fluorescence (MPF) microscope is optimized for large area imaging of hematoxylin and eosin (H&E) stained and unstained histology slides. The bleaching kinetics of MPF and SHG are examined with various laser intensities at different pulse repetition rates to determine the optimal wide-filed imaging conditions for H&E stained histology slides. Several polarimetric parameters are used to investigate the organization of extracellular matrix collagen in the histology samples.

biophysics↗

bioRxiv2021

Machine learning-enabled cancer diagnostics with widefield polarimetric second-harmonic generation microscopy

The extracellular matrix (ECM) collagen undergoes major remodeling during tumorigenesis. However, alterations to the ECM are not widely considered in cancer diagnostics, due to mostly uniform appearance of collagen fibers in white light images of hematoxylin and eosin-stained tissue sections. Polarimetric second-harmonic generation (P-SHG) microscopy enables label-free visualization and ultrastructural investigation of non-centrosymmetric molecules, which, when combined with texture analysis, provides multiparameter characterization of tissue collagen. This paper demonstrates whole slide imaging of breast tissue microarrays using high-throughput widefield P-SHG microscopy. The resulting P-SHG parameters are used in classification to differentiate tumor tissue from normal with 94.2% accuracy and F1-score, and 6.3% false discovery rate. Subsequently, the trained classifier is employed to predict tumor tissue with 91.3% accuracy, 90.7% F1-score, and 13.8% false omission rate. As such, we show that widefield P-SHG microscopy reveals collagen ultrastructure over large tissue regions and can be utilized as a sensitive biomarker for cancer diagnostics and prognostics studies.

pathology↗