title: Unwrapping differential x-ray phase-contrast images through phase estimation from multiple energy data.
abstract: We present a spectral phase unwrapping approach for grating-based differential phase-contrast data where the unwrapped interferometer phase shift is estimated from energy discriminated measurements using maximum likelihood principles. We demonstrate the method on tomographic data sets of a test specimen taken at different x-ray energies using synchrotron radiation. The proposed unwrapping technique was demonstrated to successfully correct the data set for phase wrapping.
authors: F M
authors: FM
authors: Epple
authors: G
authors: G
authors: Potdevin
authors: P
authors: P
authors: Thibault
authors: S
authors: S
authors: Ehn
authors: J
authors: J
authors: Herzen
authors: A
authors: A
authors: Hipp
authors: F
authors: F
authors: Beckmann
authors: F
authors: F
authors: Pfeiffer
mesh_terms: D000465:Algorithms; D016013:Likelihood Functions; D011856:Radiographic Image Enhancement / Q000379:methods*; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000379:methods*; D014961:X-Ray Diffraction / Q000379:methods*