Abstract
Phase contrast techniques, such as differential interference contrast (DIC) microscopy, are widely used to provide morphological images of unstained biological samples. The trans-illumination geometry required for these techniques restricts their application to thin samples. We introduce oblique back-illumination microscopy (OBM), a method of collecting en face phase gradient images of thick scattering samples, enabling near video-rate in vivo phase imaging with a miniaturized probe suitable for endoscopy.
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