Fig. 1. Schematics and photos of the computational cytometer.

a A magnetically modulated lensless imaging module (inset) that includes a lensless holographic microscope and two electromagnets driven by two alternating currents with opposite phase. The fluid sample that contains magnetic-bead-conjugated cells of interest is loaded into a capillary tube. The imaging module is mounted to a linear motion stage to scan along the sample tube to record holographic images of each section of the tube. b A laptop computer is used to control the device and acquire data. A function generator and a power supply, together with custom-designed circuitry, are used to provide the power and driving current for the linear motion stage and electromagnets