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Proceedings Paper

Morphotypic analysis and classification of bacteria and bacterial colonies using laser light-scattering, pattern recognition, and machine-learning system
Author(s): Bartek Rajwa; Murat Dundar; Valeri Patsekin; Karleigh Huff; Arun Bhunia; Murugesan Venkatapathi; Euiwon Bae; E. Daniel Hirleman; J. Paul Robinson
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Paper Abstract

Light scattering is one of the most fundamental optical processes whereby electromagnetic waves are forced to deviate from a straight trajectory by non-uniformities in the medium that they traverse. This presentation summarizes our recent research on application of light-scatter measurements paired with machine learning and pattern recognition methodologies for label-free classification of bioparticles. Two separate examples of light scatter-based techniques are discussed: forward-scatter measurements of bacterial colonies in an imaging system, and flow cytometry measurements of scatter signals formed by individual bacterial particles. Recently, we have reported a first practical implementation of a system capable of label-free classification and recognition of pathogenic species of Listeria, Salmonella, Vibrio, Staphylococcus, and E. coli using forward-scatter patterns produced by bacterial colonies irradiated with laser light. Individual bacteria in flow also form complex patterns dependent on particle size, shape, refraction index, density, and morphology. Although commercial flow cytometers allow scatter measurement at two angles this rudimentary approach cannot be used to separate populations of bioparticles of similar shape, size, or structure. The custom-built system used in the presented work collects axial light-loss and scatter signals at five carefully chosen angles. Experimental results obtained from colony scanner, as well from the extended cytometry instrument, were used to train the pattern-recognition algorithm. The results demonstrate that information provided by scatter alone may be sufficient to recognize various bioparticles with 90-99% success rate, both in flow and in imaging systems.

Paper Details

Date Published: 5 May 2009
PDF: 7 pages
Proc. SPIE 7306, Optics and Photonics in Global Homeland Security V and Biometric Technology for Human Identification VI, 73061A (5 May 2009); doi: 10.1117/12.818589
Show Author Affiliations
Bartek Rajwa, Purdue Univ. (United States)
Murat Dundar, Indiana Univ.-Purdue Univ., Indianapolis (United States)
Valeri Patsekin, Purdue Univ. (United States)
Karleigh Huff, Purdue Univ. (United States)
Arun Bhunia, Purdue Univ. (United States)
Murugesan Venkatapathi, Purdue Univ. (United States)
Euiwon Bae, Purdue Univ. (United States)
E. Daniel Hirleman, Purdue Univ. (United States)
J. Paul Robinson, Purdue Univ. (United States)

Published in SPIE Proceedings Vol. 7306:
Optics and Photonics in Global Homeland Security V and Biometric Technology for Human Identification VI
B.V.K. Vijaya Kumar; Craig S. Halvorson; Šárka O. Southern; Salil Prabhakar; Arun A. Ross, Editor(s)

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