(Color online) Photograph of the experimental setup.
Plot of the dose delivered by the x-ray tube as a function of tube current. The dose increases linearly with increase in tube current.
Plot showing the dose received by dosimeter at two different distances at fixed tube voltage and current.
Plot showing the linearity of CCD detector with respect to increase in the (a) current and (b) integration time.
(Color online) (a) Measured MTF of the CCD detector system. (b) The image was taken by keeping the resolution pattern in contact with CCD detector.
(a) Measured NPS spectrum of the detector at the dose of . Gray values (intensity in arbitrary units) are scaled for display purpose. (b) Plot of DQE of the imaging system.
(a) Image of zirconia microsphere coated with pyrocarbon at . (b) Image obtained with the polychromatic x-ray data. Color bar represents the intensity values in the images normalized to direct x rays without any object.
(Color online) [(a)–(f)] Images of alumina microspheres obtained in phase contrast mode. Data collected at , , and varying source-to-object distance from (a) , (b) , (c) , (d) , (e) , and (f) .
(a) Zirconia microspheres of diameter deposited with pyrocarbon (E3–E5). (b) Magnified image shows the nonuniformity in the coated thickness.
(a) Zirconia microspheres of diameter deposited with pyrocarbon. The image shows that pyrocarbon deposition is uniform in this case (E12). The estimated coating thickness is .(b) Magnified image highlighting the coating.
(a) Alumina coated with pyrocarbon. The estimated coating thickness is . (b) Magnified image highlighting the coating.
Experimental parameters for pyrocarbon coating on zirconia microspheres.
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