Arrangement for generation of x-ray radiation having a large real focus and a virtual focus adjusted according to requirements

Abstract

An arrangement for generating X-ray radiation comprising an anode (9) formed as a part of a sphere. The arrangement further comprises at least one virtual focus element (4) which is adapted to emit generated photons to create the useful beam field. An arrangement according to the invention has a real focus which is larger than the previously known X-ray tubes and arrangements for generating X-ray with an inclined anode surface. Accordingly, an increased radiation amount per unit of time compared to previously known X-ray tubes is achieved by the arrangement according to the invention, provided that the acceleration voltage and the electron density for each anode surface unit are equal for both arrangements. The virtual focus element (4) can be adapted to a specific field of application. Time-and geometry-related imaging errors maybe avoided due to the high photon density and a focus which can be adapted to the requirements. When generating useful radiation using the arrangement according to the present invention, the photons are equally distributed in respect of mass and energy in the beam field, which makes it possible to achieve equivalent imaging conditions in the entire useful beam field.

Description

technical field

[0001] The present invention relates to the generation of X-ray radiation, mainly for medical diagnosis and therapy, but also for other fields such as material control in industry and baggage control in aviation. Background technique

[0002] To those skilled in the art, known problems with X-ray tubes known heretofore are geometric ambiguity due to focal spot size and motion blur due to relatively long exposure times when imaging moving human organs. clarity. Another known problem is non-uniform photon energy distribution across the beam field.

[0003] All of these problems have the same basic cause, the way photons are extracted from the anode surface. In recent years, many improvements have been made to X-ray tubes to reduce the adverse effects of these known problems. Among them, improvements such as minimizing the size of the focal point, making the tube voltage uniform, and increasing the tube current to increase the amount of photons per unit time ...

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