Flow cytometry is the main technology used in hematology analyzers. However, this technology requires bulky and complex hardware systems. Lens-free imaging is an emerging microscopy technique based on a simple and compact inline holography setup. This technique enables to image a large field-of-view (≈30mm²) leading to statistical counting (>10 000 cells) in a single-shot acquisition consistent with performances required in hematology. We report high accuracy platelet count in 54 platelet-rich plasma samples. This accuracy can be achieved through a wise choice of the illumination spectral properties and an optimized algorithmic chain dedicated to small pure phase objects.
Very wide-field of view imaging can provide statistical data on large cell populations in a single acquisition. In this paper, we describe a multimodal imaging system combining brightfield, phase and fluorescence contrasts. Its greater simplicity and lower cost compared to flow cytometry make it suitable for Point-Of-Care applications. The system’s resolution was characterized on calibrated beads and resolution targets. We illustrate the potential of the single-shot imaging approach in hematology by studying the specific morphologies of white blood cell sub-types. The results suggest that very wide field of view imaging could be an alternative to flow cytometry for some applications in hematology.
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