Abstract: The invention relates to a slot aperture, in particular for an imaging device which is suitable to delimit high-energy radiation originating from a radiation source, in particular x-rays and/or synchrotron radiation. The invention further relates to a production method for said multiple slot aperture and to a use thereof for the imaging representation of a test element.

Abstract: The aim of the invention is to provide a method that increases the discernibility of fine structures in an input image and that suppresses noise. Said method comprises the following steps: calculation of a Fourier-transformation I(k) of the input image; calculation of a scaled power spectrum Psk(k) from the Fourier transformation; calculation of a noise function R(k), the following equation R(k)=Psk(k) for ?k?>ks being true for the higher frequencies k of said function above a predetermined threshold frequency ks; calculation of a differential function D(k)=Psk(k)?R(k); calculation of a filter function according to F(k)=? ?k? D(k); multiplication of the Fourier transformation I(k) with the filter function F(k) and subsequent execution of an inverse Fourier transformation (30) for calculating a reconstructed image Ir(r).

Abstract: To provide a device and a corresponding method for producing a slit diaphragm using a very simple production process, the device includes a cutting tool (12) capable of cutting along a straight line, and means capable of effecting a relative movement between the cutting tool (12) and a workpiece (10), such that the cutting tool (12) cuts the workpiece (10) along a line which corresponds a beam path in the slit diaphragm to be produced.