Practical Application of Microsphere Samples for Benchmarking a Quantitative Phase Imaging System

Overview

Journal Cytometry A

Specialties Cell Biology
Radiology

Date 2020 Dec 11

PMID 33305901

Citations 5

Authors

Edward Kwee

Alexander Peterson

Michael Halter

John Elliott

Affiliations

Soon will be listed here.

Abstract

Quantitative phase imaging (QPI) provides an approach for monitoring the dry mass of individual cells by measuring the optical pathlength of visible light as it passes through cells. A distinct advantage of QPI is that the measurements result in optical path length quantities that are, in principle, instrument independent. Reference materials that induce a well-defined optical pathlength shift and are compatible with QPI imaging systems will be valuable in assuring the accuracy of such measurements on different instruments. In this study, we evaluate seven combinations of microspheres embedded in index refraction matching media as candidate reference materials for benchmarking the performance of a QPI system and as calibration standards for the optical pathlength measurement. Poly(methyl metharylate) microspheres and mineral oil were used to evaluate the range of illumination apertures, signal-to-noise ratios, and focus positions that allow an accurate quantitative optical pathlength measurement. The microsphere-based reference material can be used to verify settings on an instrument that are suitable for obtaining an accurate pathlength measurement from biological cells. The microsphere/media reference material is applied to QPI-based dry mass measurements of a population of HEK293 cells to benchmark and provide evidence that the QPI image data are accurate.

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Practical application of microsphere samples for benchmarking a quantitative phase imaging system.

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