Abstract: The invention relates to an X-ray source (10) comprising at least one waveguide (30) for X-ray radiation, wherein the at least one waveguide (30) has a core (32) and a casing (40) surrounding the core (32), and wherein at least one part of the waveguide (30) is designed to emit X-ray radiation (50), if the part of the waveguide (30) is bombarded with electrons (52). The invention also relates to a system for generating X-ray radiation comprising an X-ray source of this type, and a method for generating X-ray radiation by means of an X-ray source of this type or a system of this type.

Abstract: A tomographic image-capturing technique is described. According to one device aspect (100) of the technique, a radiation source (102) is embodied to emit a beam. The radiation source (102) has a first transverse dimension (108) across the beam and a second transverse dimension (110) substantially perpendicular to the first transverse dimension (108). The second transverse dimension (110) is larger than the first transverse dimension (108). A detector (106) is embodied to capture the beam. A sample holder (104) arranged between radiation source (102) and detector (106) is embodied to rotate a sample in the beam about a first axis (112) and about a second axis (114) which differs from the first axis (112).