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Methods for Measuring Dry Mass Change in Time-Lapse Gradient Light Interference Microscopy

Gradient Light Interference Microscopy (GLIM) is a recently developed label-free technique used for imaging optically thick samples, such as acute brain slices.  GLIM is similar to spatial light interference microscopy (SLIM) but differs from it because it measures the gradient of the phase rather than the phase itself [2].  Once the sample is imaged, it needs to be reconstructed, meaning phase integration of the gradient image must be performed to recover the object’s scattering potential.  In this project, we validated the performance of GLIM by comparing several integration techniques with samples of pillars as well as with acute brain slices.  We demonstrated the capability of our approach to measuring the dry mass change of cells in the brain slices over periods of the order of hours and developed a new imaging method, GLIM, for imaging 3D tissue cultures and models, which enables quantitative observation with DIC images, and has the potential to track subtle changes in diseased tissue.

Author: 
Brittani Carroll
School: 
University of Evansville
Department: 
Electrical Engineering and Mathematics
Research Advisor: 
Dr. Gabriel Popescu
Department of Research Advisor: 
Electrical & Computer Engineering
Year of Publication: 
2017