X-ray Phase Contrast Imaging

[X-ray Phase Contrast Imaging]

An x-ray far-field interferometer using only phase gratings is based on the phase moiré effect. The mid grating forms Fourier images of the first grating. These images beat with the 3rd grating to produce broad moiré fringes on the detector at the appropriate distance. Phase shifts and de-coherence of the wavefront by the object cause fringe shifts and attenuation of the fringe contrast. (Source: https:
An x-ray far-field interferometer using only phase gratings is based on the phase moiré effect. The mid grating forms Fourier images of the first grating. These images beat with the 3rd grating to produce broad moiré fringes on the detector at the appropriate distance. Phase shifts and de-coherence of the wavefront by the object cause fringe shifts and attenuation of the fringe contrast.

X-RAY PHASE-CONTRAST (PC) IMAGING AND TOMOGRAPHY

The field of X-ray imaging is currently undergoing a revolution due to the development of X-ray phase-contrast (PC) imaging methods that have dramatic advantages over conventional radiographic X-ray imaging systems. Conventional X-ray imaging methods are based on absorption effects and therefore image contrast is due to differences only in the X-ray absorption properties of the tissues. This can be problematic when imaging soft tissues that do not possess large variations in X-ray absorption properties. There remains an important need for optimization, improvement, characterization, and validation of PC imaging methods, to make them suitable for routine and widespread use. Our research group is actively developing image formation methods for X-ray PC imaging and is collaborating with several groups (including Electronics and Telecommunications Research Institute (ETRI), Yonsei university, and Stanford University) and other institutions to translate the technology to address important needs in clinical and preclinical medicine.