KobRa

Compact fiber-ceramic based X-ray tube for mobile computed tomography scanners

Computed tomography, an established method in diagnostic radiology, is successfully employed today for the diagnosis of various medical conditions. Particularly in stroke patients as well as in accident and attack victims, the use of mobile computed tomography (CT) units installed in ambulances can significantly increase survival and recovery chances. To achieve this technically, a drastic reduction in volume and weight of the components integrated into the CT is necessary.

Disc with a raised section in the centre. — Carbon/Carbon rotation unit with strain gauges.

In the collaborative project “KobRa“, the volume and weight of the X-ray emitter were reduced by more than 40% through functional integration and the use of new technologies. Additionally, the ramp-up time was significantly shortened by employing higher torque and reducing the mass of the drive unit. In close collaboration with consortium partners, a fiber-reinforced ceramic anode base was conceived and designed. Carbon-fiber-reinforced carbon was used as the base material, known for its high thermal conductivity and specific strength extending into the ultra-high-temperature range. These properties are crucial, as the compact design of the rotation system of the X-ray tube necessitates a substantial increase in the frequency of the anode's rotation, maintaining consistent short-term peak loads to avoid thermal overloading of the focal track.
In practical component tests, the rotors manufactured during the project not only surpassed expectations regarding mechanical and thermal performance but also demonstrated their potential for use as compact X-ray anodes.