[Lab on a chip] Holographic microscope slide in a spatio-temporal imaging modality for reliable 3D c
In the current trend of miniaturization and simplification of imaging flow cytometry, Lab-on-a-Chip (LoC) microfluidic devices represent an innovative and cost-effective solution. In this framework, we propose for the first time a novel platform based on the compactness of a holographic microscope slide (HMS) in combination with the new computational features of space-time digital holography (STDH) that uses a 1D linear sensor array (LSA) instead of 2D CCD or CMOS cameras to respond to real diagnostic needs. In this LoC platform, computational methods, holography, and microfluidics are intertwined in order to provide an imaging system with a reduced amount of optical components and capability to achieve reliable cell counting even in the absence of very accurate flow control. STDH exploits the sample motion into the microfluidic channel to obtain an unlimited field-of-view along the flow direction, independent of the magnification factor. Furthermore, numerical refocusing typical of a holographic modality allows imaging and visualization of the entire volume of the channel, thus avoiding loss of information due to the limited depth of focus of standard microscopes. Consequently, we believe that this platform could open new perspectives for enhancing the throughput by 3D volumetric imaging.
Biagio Mandracchia,*a Vittorio Bianco,a Zhe Wang,ab Martina Mugnano,a Alessia Bramanti,ac Melania Paturzoa and Pietro Ferraroa Author affiliations * Corresponding authors a Institute of Applied Sciences and Intelligent Systems—Italian National Research Council (ISASI-CNR), Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy E-mail: firstname.lastname@example.org b College of Applied Sciences, Beijing University of Technology, Beijing 100124, China c IRCCS Centro Neurolesi “Bonino Pulejo”, Messina, Italy