Peter Sievers

TL;DR: In this paper, it was shown that a distribution of micrometer-sized calcifications in the human breast which are not visible in clinical x-ray mammography at diagnostic dose levels can produce a significant dark-field signal in a grating-based xray phase-contrast imaging setup with a tungsten anode xray tube operated at 40 kVp.

TL;DR: In this paper, a Bayesian deconvolution method was proposed to improve the stability of the deconvolved spectrum by reducing the minimum radiation flux needed for reconstruction, which significantly reduced the uncertainties that spectrum reconstruction algorithms like spectrum stripping impose on reconstruction results.

TL;DR: The application-specific integrated circuit (ASIC) chip which was designed to provide pre-processing of photo-induced signals in the detector and readout of the processed digital data is described.

TL;DR: A method for combining the energy resolved phase-contrast images based on energy weighting is presented and an improvement in contrast-to-noise ratio by 58.2% with respect to an emulated integrating detector could be observed in the final image.

TL;DR: The response of a dosimeter based on a hybrid photon counting pixel detector can fulfill the IEC type testing requirements and is tested experimentally by reconstructing the air kerma free in air for different qualities of X-radiation in the energy range below 150 keV with an accuracy better than 4%.