  We report the initial demonstrations of the use of single crystals in
indirect x-ray imaging for x-ray phase contrast imaging at the Washington
University in St. Louis Computational Bioimaging Laboratory (CBL). Based on
single Gaussian peak fits to the x-ray images, we observed a four times smaller
system point spread function (21 {\mu}m (FWHM)) with the 25-mm diameter single
crystals than the reference polycrystalline phosphor's 80-{\mu}m value.
Potential fiber-optic plate depth-of-focus aspects and 33-{\mu}m diameter
carbon fiber imaging are also addressed.
