A novel X-ray source based on parametric X-ray radiation
(PXR) has been employed for X-ray imaging at the Laboratory for
Electron Beam Research and Application (LEBRA), Nihon
University. Notable features of PXR are tunable energy,
monochromaticity with spatial chirp, narrow local bandwidth and
spatial coherence. Since the X-ray beam from the PXR system has a
large irradiation area with uniform flux density, the PXR-based
source is suited for X-ray imaging, especially for application to
phase-contrast imaging. Despite the cone-like X-ray beam,
diffraction-enhanced imaging (DEI) can be employed as a phase
contrast imaging technique. DEI experiments were performed using
14- to 34-keV X-rays and the phase-gradient images were obtained.
The results demonstrated the capability of PXR as an X-ray source
for phase-contrast imaging with a large irradiation field attributed
to the cone-beam effect. Given the significant properties of the
LEBRA-PXR source, the result suggests the possible construction of a
compact linac-driven PXR-Imaging instrument and its application to
medical diagnoses.
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