title: Zernike x-ray ptychography.
abstract: We present an imaging technique combining Zernike phase-contrast imaging and ptychography. The contrast formation is explained by following the theory of Zernike phase-contrast imaging. The method is demonstrated with x-rays at a photon energy of 6.2 keV, showing how ptychographic reconstruction of a phase sample leads to a Zernike phase-contrast image appearing in the amplitude reconstruction. In addition, the results presented in this Letter indicate an improvement of the resolution of the reconstructed object in the case of Zernike ptychography compared with the conventional one.
authors.forename: Ismo
authors.initials: I
authors.lastname: Vartiainen
authors.forename: Istvan
authors.initials: I
authors.lastname: Mohacsi
authors.forename: Karolina
authors.initials: K
authors.lastname: Stachnik
authors.forename: Manuel
authors.initials: M
authors.lastname: Guizar-Sicairos
authors.forename: Christian
authors.initials: C
authors.lastname: David
authors.forename: Alke
authors.initials: A
authors.lastname: Meents
mesh_terms: D007091:Image Processing, Computer-Assisted; D061848:Optical Imaging / Q000379:methods*; D055620:Optical Phenomena; D059629:Signal-To-Noise Ratio; D014965:X-Rays