Multifocal structured illumination microscopy (MSIM) can rapidly retrieve 3D structures of thick samples by using multi-spot excitation and detection. Although numerous super-resolution (SR) and optical sectioning (OS) methods have been introduced in this field, the existing OS-SR method in MSIM still has the difficulty in rejecting deep defocused light, which may lead to strong background signal in the retrieved results. To this end, an enhanced OS-SR method is proposed to simultaneously achieve the desired OS capability and significant resolution improvement in MSIM. The enhanced OS-SR image is obtained by combining the standard deviation image with the conventional OS-SR image in the frequency domain. The validity of the proposed method is demonstrated by simulation and experimental results.
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