Caltech engineers show how to make cost-effective, ultra-high-performance microscopes
Engineers at the California Institute of Technology (Caltech) have devised a method to convert a relatively inexpensive conventional microscope into a billion-pixel imaging system that significantly outperforms the best available standard microscope. Such a system could greatly improve the efficiency of digital pathology, in which specialists need to review large numbers of tissue samples. By making it possible to produce robust microscopes at low cost, the approach also has the potential to bring high-performance microscopy capabilities to medical clinics in developing countries.
“In my view, what we’ve come up with is very exciting because it changes the way we tackle high-performance microscopy,” says Changhuei Yang, professor of electrical engineering, bioengineering and medical engineering at Caltech.
Yang is senior author on a paper that describes the new imaging strategy, which appears in the July 28 early online version of the journal Nature Photonics.
Until now, the physical limitations of microscope objectives—their optical lenses— have posed a challenge in terms of improving conventional microscopes. Microscope makers tackle these limitations by using ever more complicated stacks of lens elements in microscope objectives to mitigate optical aberrations. Even with these efforts, these physical limitations have forced researchers to decide between high resolution and a small field of view on the one hand, or low resolution and a large field of view on the other. That has meant that scientists have either been able to see a lot of detail very clearly but only in a small area, or they have gotten a coarser view of a much larger area.
“We found a way to actually have the best of both worlds,” says Guoan Zheng, lead author on the new paper and the initiator of this new microscopy approach from Yang’s lab. “We used a computational approach to bypass the limitations of the optics. The optical performance of the objective lens is rendered almost irrelevant, as we can improve the resolution and correct for aberrations computationally.”
Indeed, using the new approach, the researchers were able to improve the resolution of a conventional 2X objective lens to the level of a 20X objective lens. Therefore, the new system combines the field-of-view advantage of a 2X lens with the resolution advantage of a 20X lens. The final images produced by the new system contain 100 times more information than those produced by conventional microscope platforms. And building upon a conventional microscope, the new system costs only about $200 to implement.
“One big advantage of this new approach is the hardware compatibility,” Zheng says, “You only need to add an LED array to an existing microscope. No other hardware modification is needed. The rest of the job is done by the computer.”
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