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Recent advancements in whole slide imaging (WSI) have moved pathology closerto digital practice. Existing systems require precise mechanical control andthe cost is prohibitive for most individual pathologists. Here we report alow-cost and high-throughput WSI system termed OpenWSI. The reported system isbuilt using off-the-shelf components including a programmable LED array, aphotographic lens, and a low-cost computer numerical control (CNC) router.Different from conventional WSI platforms, our system performs real-timesingle-frame autofocusing using color-multiplexed illumination. For axialpositioning control, we perform coarse adjustment using the CNC router andprecise adjustment using the ultrasonic motor ring in the photographic lens. Byusing a 20X objective lens, we show that the OpenWSI system has a resolution of~0.7 microns. It can acquire whole slide images of a 225-mm^2 region in ~2mins, with throughput comparable to existing high-end platforms. The reportedsystem offers a turnkey solution to transform the high-end WSI platforms intoone that can be made broadly available and utilizable without loss of capacity.

OpenWSI: a low-cost, high-throughput whole slide imaging system via single-frame autofocusing and open-source hardware