27 April 2016 Hyperspectral imaging for presumptive identification of bacterial colonies on solid chromogenic culture media
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Abstract
BioMérieux is automating the microbiology laboratory in order to reduce cost (less manpower and consumables), to improve performance (increased sensitivity, machine algorithms) and to gain traceability through optimization of the clinical laboratory workflow. In this study, we evaluate the potential of Hyperspectral imaging (HSI) as a substitute to human visual observation when performing the task of microbiological culture interpretation. Microbial colonies from 19 strains subcategorized in 6 chromogenic classes were analyzed after a 24h-growth on a chromogenic culture medium (chromID® CPS Elite, bioMérieux, France). The HSI analysis was performed in the VNIR region (400-900 nm) using a linescan configuration. Using algorithms relying on Linear Spectral Unmixing, and using exclusively Diffuse Reflectance Spectra (DRS) as input data, we report interclass classification accuracies of 100% using a fully automatable approach and no use of morphological information. In order to eventually simplify the instrument, the performance of degraded DRS was also evaluated using only the most discriminant 14 spectral channels (a model for a multispectral approach) or 3 channels (model of a RGB image). The overall classification performance remains unchanged for our multispectral model but is degraded for the predicted RGB model, hints that a multispectral solution might bring the answer for an improved colony recognition.
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Mathilde Guillemot, Mathilde Guillemot, Rony Midahuen, Rony Midahuen, Delpine Archeny, Delpine Archeny, Corine Fulchiron, Corine Fulchiron, Regis Montvernay, Regis Montvernay, Guillaume Perrin, Guillaume Perrin, Denis F. Leroux, Denis F. Leroux, } "Hyperspectral imaging for presumptive identification of bacterial colonies on solid chromogenic culture media", Proc. SPIE 9887, Biophotonics: Photonic Solutions for Better Health Care V, 98873L (27 April 2016); doi: 10.1117/12.2229761; https://doi.org/10.1117/12.2229761
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