Abstract: In a method of controlling a lithography-based additive manufacturing device capable of manufacturing a three-dimensional component from a plurality of volume elements, a check is made to determine whether the volume elements are entirely within the three-dimensional virtual model by identifying at least first and second boundary points of the volume element or virtual model in x-y planes spaced apart in the z-direction, and the volume element in question is provided for the manufacturing process only if it is within the model with respect to the first and second boundary points.

Abstract: A method of producing a test body for diffusion tensor imaging, which comprises a plurality of channels in a structuring material, the channels preferably having a maximum cross-section of 625 ?m2, wherein a virtual model of the test body is created and the virtual model is fed to a structuring device which produces the test body by means of a 3D printing-based, in particular lithography-based, structuring process, the structuring process being designed as a multiphoton lithography process, in particular as a multiphoton absorption process, in which the structuring material containing a photosensitizer or photoinitiator is irradiated in a location-selective manner, wherein the radiation is successively focused on focal points lying within the structuring material, resulting in that in each case a volume element of the material located in the focal point is subjected to a change in state by means of a photochemical reaction as a result of multiphoton absorption.

Abstract: A method of producing a test body for diffusion tensor imaging, which comprises a plurality of channels in a structuring material, the channels preferably having a maximum cross-section of 625 ?m2, wherein a virtual model of the test body is created and the virtual model is fed to a structuring device which produces the test body by means of a 3D printing-based, in particular lithography-based, structuring process, the structuring process being designed as a multiphoton lithography process, in particular as a multiphoton absorption process, in which the structuring material containing a photosensitizer or photoinitiator is irradiated in a location-selective manner, wherein the radiation is successively focused on focal points lying within the structuring material, resulting in that in each case a volume element of the material located in the focal point is subjected to a change in state by means of a photochemical reaction as a result of multiphoton absorption.

Abstract: In a method for lithography-based generative production of three-dimensional components, in which material that can be solidified under the effect of electromagnetic radiation is arranged in a vat, a build platform is positioned at a distance from the vat bottom, material located between the build platform and the vat bottom is irradiated at selected locations with the aid of an irradiating unit, the electromagnetic radiation is introduced into the material from below through a vat bottom that is transmissive to the radiation, at least in a certain region, and successively focused on focal points within the material, whereby a volume element of the material that is respectively located at the focal point is solidified. The solidification takes place by means of multiphoton absorption and the volume of the focal point is varied at least once during the method, and so the component is built up from solidified volume elements of different volumes.