We have developed a phase-contrast X-ray microtomography system based on scanning microscopy with X-ray focusing optics. The system is very simple because only two conventional intensity detectors and a half-obstructing-plate for the second detector are installed into the conventional scanning microscopy setup. We constructed the system with a 450-nm-size focused beam of a 10 keV X-ray. The system is operated with a sampling rate of 100 Hz. Adopting data correction using a guide object and data interpolation procedure in sinograms, tomographic reconstruction images with a high spatial resolution and phase sensitivity are obtained.
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