Phase-contrast imaging using parametric X-rays

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A novel X-ray source based on Parametric X-ray radiation(PXR) has been employed for phase-contrast imaging at the Laboratory for Electron Beam Research and Application(LEBRA), Nihon University, Japan.Since the angular distribution of PXR has a width of～1/γ(γ: the Lorentz factor), the X-ray beam profile at the take-out window, which is located about 7 m downstream from the source, becomes approximately 100 mm in diameter. For an efficient use of the large irradiated area of PXR in imaging, Laue geometry of diffraction enhanced imaging has been studied. The five times larger visual field than Bragg geometry has been achieved in the present analyzer(60 mm in width).Particular properties of PXR, i. e. angular divergence and horizontal energy dispersion were confirmed by simulation and experiments. The effects attributed to these were, however, scarcely ever recognized in the images.These results indicate the feasibility of the PXR-DEI as a tool for medical diagnoses.