Abstract:
The rotatable anode of a rotating anode X-ray source has demanding requirements placed upon it. For example, it may rotate at a frequency as high as 200 Hz. X-ray emission is stimulated by applying a large voltage to the cathode, causing electrons to collide with the focal track. The focal spot generated at the electron impact position may have a peak temperature between 2000°C and 3000°C. The constant rotation of the rotating anode protects the focal track to some extent, however the average temperature of the focal track immediately following a CT acquisition protocol may still be around 1500°C. Therefore, demanding requirements are placed upon the design of the rotating anode. The present application proposes a multi-layer coating for the target region of a rotating X-ray anode which improves mechanical resilience and thermal resilience, whilst reducing the amount of expensive refractory metals required.
Abstract:
Die Erfindung betrifft eine Röntgenstrahlungsquelle, in der insbesondere monochromatische Röntgenstrahlung erzeugt werden kann. Außerdem betrifft die Erfindung ein Verfahren zum Erzeugen von Röntgenstrahlung sowie eine Verwendung der Röntgenstrahlungsquelle zur Durchleuchtung von Körpern (beispielsweise menschlichen Körpern). Erfindungsgemäß ist vorgesehen, dass in einem Gehäuse als Target ein Aerogel (12) beispielsweise in Form von einer Stange (45) zur Verfügung ge- stellt wird. Diese wird mit einem Elektronenstrahl (13) beschossen, wobei hierbei das Aerogel (12) wegen seiner extrem geringen Dichte und der hohen Energie verdampft. Deswegen wird das Target über eine Rolle (46) nachgeführt, so dass immer unverbrauchtes Target zur Erzeugung der insbesondere monochromatischen Röntgenstrahlung zur Verfügung steht.
Abstract:
Provided are a radiation generating apparatus, a radiography system, and a radiation emission target having a stable radiation emission characteristic and improving the bonding characteristic between a target layer and a diamond substrate. A transmission type target includes a target layer, a carbon containing region having an sp2 bond, and a diamond substrate supporting the target layer. The carbon containing region is located between the target layer and the diamond substrate.
Abstract:
This application discloses a compact source for high brightness x-ray generation. Higher brightness is achieved through electron beam bombardment of multiple regions aligned with each other to achieve a linear accumulation of x-rays. This is achieved by aligning discrete x-ray emitters, or through use of novel x-ray targets comprising a number of microstructures of x-ray generating materials fabricated in close thermal contact with a substrate with high thermal conductivity. This allows heat to be more efficiently drawn out of the x-ray generating material, and allows bombardment of this material with higher electron density and/or higher energy electrons, leading to greater x-ray brightness. The orientation of the microstructures allows the use of an on-axis collection angle, allowing accumulation of x-rays from several microstructures to be aligned, appearing to have a single origin, also known as "zero-angle" x-ray emission.