K-space interpretation of image-scanning-microscopy

In recent years, image-scanning microscopy (ISM, also termed pixel-reassignment microscopy) has emerged as a technique that improves the resolution and signal-to-noise compared to confocal widefield by employing detector array at image plane of laser scanning microscope. Here, we present k-space analysis coherent ISM, showing ISM is equivalent spotlight synthetic-aperture radar (SAR) analogous oblique-illumination microscopy. This insight indicates can be performed with single placed in sample, which numerically demonstrate.