Reducing Artifacts In X-ray Interferometry Using Multiple Harmonics

X-ray interferometry is a promising medical imaging modality because of its ability to capitalize on properties of light to simultaneously measure absorption, scatter, and refraction to produce attenuation, dark-field, and differential-phase images in a single scan. This allows a promising application in using x-rays to image more features of the human body besides dense tissue. Images are created by fitting sinusoidal parameters to the fringe pattern at the detector created by a diffraction grating. Currently, only one harmonic has been used in making the images. By considering the second harmonic we can fit more sinusoidal parameters to the phase stepping curve resulting in an image with less artifact error.