3 May 2002 Image quality in digital phase contrast imaging using a tungsten anode x-ray tube with small focal-spot size
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Phase contrast x-ray imaging has been studied intensively using x-rays from synchrotron radiation and micro-focus x- ray rubes. However, these studies have revealed the difficulty of this technique's application to practical medical imaging. We have created a phase contrast imaging technique using practical x-ray tubes with small focal spot sizes. In a previous study, we identified the radiographic conditions for phase contrast magnification mammography with screen-film systems, where the edge effect due to phase contrast outweighs the geometrical unsharpness introduced by the 0.1mm-focal spot of a molybdenum-anode x-ray tube. In the present study, phase contrast images of a hand and a chest phantoms were obtained using computed radiography and a geometrical magnification of two using a tungsten-anode x- ray tube with a 0.1mm-focal spot. The digital images were printed so that objects were reproduced at their original size. Compared to conventional digital contact images obtained at the same x-ray dose, the life-sized digital phase contrast x-ray images displayed improved sharpness and resolution, and reduced grain. We describe the empirical results of digital phase contrast imaging, and discuss these performance improvements through simulation including x-ray scatter.
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Hiromu Ohara, Hiromu Ohara, Chika Honda, Chika Honda, Akira Ishisaka, Akira Ishisaka, Fumio Shimada, Fumio Shimada, } "Image quality in digital phase contrast imaging using a tungsten anode x-ray tube with small focal-spot size", Proc. SPIE 4682, Medical Imaging 2002: Physics of Medical Imaging, (3 May 2002); doi: 10.1117/12.465619; https://doi.org/10.1117/12.465619

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