Siemens Aktiengesellschaft

Albert-ludwigs-universitat Freiburg

Esther Meyer

Dominik Paul

Rainer Raupach

Per Egedal

Peder Bay Enevoldsen

Marc Kachelriess

Guobin Li

Søren Hjort

Jochen Cleve

Martin Greiner

In a method to operate a magnetic resonance (MR) system to acquire MR data, an RF excitation pulse is radiated followed by repeated, chronologically sequential implementation of the following steps in order to respectively acquire the MR data of an echo train. A refocusing pulse is radiated, a phase coding gradient is activated, and an additional magnetic field gradient for spatial coding is activated in a direction that is orthogonal to the direction of the phase coding gradient in order to read out the MR data of a k-space line. A k-space line in the k-space center is acquired at a predetermined echo time. A first half of k-space is acquired by entering data into k-space lines of the respective echo train, the data being acquired before the echo time. A second half of k-space is acquired by entering data into k-space lines of the respective echo train, this data having been acquired after the echo time. The k-space lines in the first half of k-space have a first density while the k-space lines in the second half of k-space have a second density that differs from the first density.

Method and magnetic resonance apparatus to acquire MR data and to reconstruct an MR image

In a method to associate k-space lines with echo trains of raw magnetic resonance data, parallel k-space lines orthogonally intersect a plane at respective intersection points. Each echo train has a trajectory length, and the k-space lines are associated with the echo trains such that a sum of trajectory lengths of all echo trains is minimal. The trajectory length TL of an echo train is defined by wherein L is a sequence of k-space lines, Pis an intersection point of the i-th k-space line of the echo train with the plane; andis the length of the path from the i-th intersection point to the (i+1)-th intersection point.

Method to enter magnetic resonance data into a memory organized as k-space, and magnetic resonance apparatus operating according to the method

A method is disclosed for reducing metal artifacts in CT image datasets. An embodiment of the method includes reconstructing a first CT image dataset with and a second CT image dataset without metal artifact correction, weighted summation of a high-pass-filtered first and a high-pass-filtered second CT image dataset plus a low-pass-filtered second CT image dataset, wherein the weightings are dependent on the proximity to metal in the CT image datasets. A computing unit, a CT system and a C-arm system designed to execute the method are also disclosed.

Method, computing unit, CT system and C-arm system for reducing metal artifacts in CT image datasets

A method and a device for operating a wind farm with a plurality of wind turbines are provided. According to the method, operating parameters of the wind turbines of the wind farm are adjusted according to an optimization goal, the optimization goal being the maximum value of the total output of the wind farm produced from the sum of all individual outputs of the wind turbines. The optimization goal differs from conventional optimization goals where the respective individual outputs of the wind turbines are optimized without taking the overall output into consideration.

Method for operating a wind farm comprising a plurality of wind turbines

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Erlangen, Germany

Esther Meyer