Fig. 5

Phase-type self-healing spiral phase contrast imaging. (a) Unstained paramecium cell image. Scale bar: 500 μm. (b) Self-healing spiral phase contrast images with obstacle diameters of 0 μm, 100 μm, 200 μm and 300 μm. Scale bar: 500 μm. (c) The normalized intensity distributions of the results in (b) with obstacle diameters of 0 μm, 100 μm, 200 μm and 300 μm.