Siemens Aktiengesellschaft

Heinrich Wallschläger

Thomas Flohr

Herbert Bruder

Rainer Raupach

Martin Sedlmair

Friedrich Distler

Karlheinz Pauli

Johannes Ebersberger

Wolfgang Bressel

A method is disclosed for reconstructing image data of an examination object from measured data, the measured data being captured during a rotating movement of a radiation source of a computed tomography system around the examination object. In at least one embodiment, different iteration images of the examination object are determined successively from the measured data by way of an iterative algorithm, wherein with the iterative algorithm the current iteration image at any one time is high-pass-filtered and weighted as a function of contrast using a variable which contains contrast information relating to the current iteration image at that time.

Contrast-dependent regularization strength in the iterative reconstruction of CT images

A gating device to delimit an x-ray beam, has a device housing, first and second absorber elements mounted in the device housing opposite each other, and an adjustment device for moving the absorber elements relative to each other to set a spacing therebetween forming a slit for passage of an x-ray beam therethrough. Each absorber element has an edge shaped to give the slit a slit width that varies in a longitudinal direction of the slit that increases outwardly from a central position toward respectively opposite ends of the slit. Each slit edge has a middle region producing a uniform width of the slit and further regions respectively disposed on opposite sides of the middle region that produce a linearly, longitudinally increasing slit width. The adjustment device produces a parallelogram-like relative movement between the absorber elements.

Computed tomography apparatus and beam diaphragm therefor having absorber elements shaped to produce a non-uniform beam passage opening

In a method for calculating the temperature T of a solid body or the time t that is needed for a change of the temperature T of the solid body, a solution function to a dimensionless equation corresponding to the differential equation dT/dt=b&#x2212;aT&#x2212;cT, is determined and used to create a matrix=(a) with which T or t can be easily calculated.

Computer-assisted method for calculating the temperature of a solid body

In a method for diaphragm regulation in a computed tomography system and a computed tomography system with diaphragm regulation and a multi-line detector, the image detector signals are utilized for generating a setting signal for the diaphragm.

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Erlangen, Germany

Heinrich Wallschläger