In vitro analysis of exfoliated cells plays an important role in disease screening and clinical diagnosis. An accurate cytological diagnosis depends largely on the ability to detect changes in cellular and nuclear structural characteristics of individual single cells. The diffraction-limited resolution of a conventional light microscope limis the detection of mostly micron-scale features of cancer cells, which result in intra-observer variation, missed early-stage cancers (false negatives), and indeterminate cases that often result in unnecessary invasive procedures in the absence of cancer (false positives). Technologies that perform high-speed, accurate, quantitative and cost-effective cytological analysis and are suitable for routine clinic use are urgently needed. Cellular nanoscale structural changes represent a promising strategy for identifying pre-cancerous or cancerous cells. We have recently developed two complementary techniques, both of which can assess nanoscale structural characteristics at the single-cell level: quantitative phase microscopy and spectral-encoding of spatial frequency (SESF). We demonstrated their ability to detect structural changes in pre-cancerous cells missed by conventional light microscopy. We propose to develop a new advanced microscopy that integrates the complementary attributes of these two techniques to perform real-time quantitative structural imaging and high-speed and comprehensive nanoscale structural analysis of label-free single cells in their natural state for use in both research and clinical applications. The technical performance of this microscopy system will be characterized and their ability to analyze nanoscale structures will be rigorously validated. It will be optimized for routine clinical use to analyze unstained exfoliative cytology specimens by developing cell segmentation algorithm and multi-metric structural analysis. We will focus on two large-volume and clinically challenging cytology specimens as our disease models: cervical and urine cytology. The accuracy of the system will be tested using a relatively large scale of cervical and urine cytology specimens via a training and a validation set. If successful, this technique could be used to support conventional cytology for accurate, quantitative, high-speed, comprehensive and cost-effective cytological analysis to improve the diagnostic accuracy and prevent costly unnecessary procedures.

Public Health Relevance

This project aims to develop an advanced imaging microscopy system for high-speed and comprehensive nanoscale structural analysis of unlabeled single cells for use in research and clinical applications. It will be optimized for routne clinical use to analyze exfoliative cytology, which plays a significant role in disease screening and diagnosis. If successful, the technique will significantly improve the diagnostic accuracy of cancer screening and reduce number of false positives and false negatives.

Agency
National Institute of Health (NIH)
Institute
National Institute of Biomedical Imaging and Bioengineering (NIBIB)
Type
Research Project (R01)
Project #
5R01EB016657-02
Application #
8642179
Study Section
Biomedical Imaging Technology Study Section (BMIT)
Program Officer
Conroy, Richard
Project Start
2013-04-01
Project End
2017-03-31
Budget Start
2014-04-01
Budget End
2015-03-31
Support Year
2
Fiscal Year
2014
Total Cost
$335,288
Indirect Cost
$117,038
Name
University of Pittsburgh
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
004514360
City
Pittsburgh
State
PA
Country
United States
Zip Code
15213
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