X-ray detector comprising light source on holder element

Abstract

The invention discloses an X-ray detector 1 comprising a light source on a holder element. The X-ray detector 1 includes a converter element 3 and a carrier element 5 in a stack arrangement. In an embodiment, the X-ray detector further includes a light source 7 arranged on the carrier element 5, a light-directing unit 9 formed outside a projection of a planar extension 4 of the converter element 3in the stacking direction, and a light-directing unit 9 arranged such that a quantity of light emitted from the light source 7 is incident on a surface of the converter element 3, facing away from the carrier element via a light path 11.

Description

technical field [0001] The invention relates to an x-ray detector and its medical device; the x-ray detector has a light source arranged on a carrier element which illuminates a converter element of the x-ray detector via a beam path. Background technique [0002] In X-ray imaging, such as computed tomography, angiography or radiography, counting direct conversion X-ray detectors or integrating indirect conversion X-ray detectors can be used. [0003] In integral indirect conversion X-ray detectors, X-ray radiation or photons can be converted into light by suitable converter materials and into electrical pulses by photodiodes. Scintillators, such as GOS (Gd2O2S), CsJ, YGO, and LuTAG, are commonly used as converter materials. In particular, scintillators are used in medical X-ray imaging in the energy range up to 1 MeV. So-called indirect conversion X-ray detectors (so-called scintillator detectors) are usually used, in which the conversion of X-rays or gamma rays into elec...

AI Technical Summary

Problems solved by technology

[0011] The invention addresses the problem of insufficient heat dissipation and / or insufficient cooling leading to a limited amount of light: when radiating large amounts of light, the light source can overheat beyond the so-called SOA (Safe Operating Area), thereby limiting the lifetime of the light source (e.g. LED) , and thus limit the service life of the X-ray detector

[0012] Due to the limited amount of light, it is not possible to supply enough light output to the converter material for the material to be better conditioned

The negative drift characteristic can only be reduced insufficiently so that the count rate drift of the evaluation unit leads to corresponding negative image artifacts, so that a consistently good image quality can hardly be guaranteed during operation

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