公开(公告)号：US11169238B2

公开(公告)日：2021-11-09

申请号：US16168040

申请日：2018-10-23

申请人： Bruker BioSpin MRI GmbH

发明人： Arno Nauerth ,  Michael Heidenreich

IPC分类号： G01R33/48 ,  G01R33/567 ,  G01R33/561 ,  G01R33/483

摘要： Techniques for determining motion states of at least two bodies by an MR-device are provided, wherein the bodies each have a respective target region which is in an anatomic motion comprising a repetitive motion pattern with a motion repetition rate, and in particular, for cardiac and/or respiratory motion. A sequence of individual MR-measurements are performed on the bodies at a MR-repetition rate higher than the motion-repetition rate, wherein nuclear spins of the at least two bodies are excited during the sequence of individual MR-measurements either simultaneously or alternately at navigator times. With the individual MR-measurements, navigator signals are determined, each respective navigator signal indicative of the motion state of at least one of the motion patterns at the navigator time of the navigator signal. These techniques allow simultaneously determining motion states for imaging more than one body with a repetitive motion pattern with reduced preparation time.

公开(公告)号：US09869738B2

公开(公告)日：2018-01-16

申请号：US15368463

申请日：2016-12-02

申请人： Bruker BioSpin MRI GmbH

发明人： Arno Nauerth

IPC分类号： G01R33/56 ,  A61B5/055 ,  G01R33/563 ,  A61B90/00

CPC分类号： G01R33/5601 ,  A61B5/055 ,  A61B34/20 ,  A61B90/39 ,  A61B2090/3954 ,  A61B2576/00 ,  G01N24/08 ,  G01R33/287 ,  G01R33/385 ,  G01R33/44 ,  G01R33/56308 ,  G01R33/56509

摘要： A method for determining the position of at least one ferromagnetic particle (30) in a liquid matrix (31) with an MRI system (50). An MRI measurement sequence (MS1, MS2) is applied (20) to a measurement volume (52) in which the particle is situated. The measurement sequence includes a plurality of individual measurements (E1, E2), during each of which there is a spatially encoding gradient switching operation, including an excitation pulse (1) and signal recording (2), via the MRI system. The measurement sequence has a multiplicity of measurement blocks (MB1, MB2), which each include one or more individual measurements and, in a pause of the spatial encoding, an intermediate gradient (ZW) switched by the MRI system. The intermediate gradients are dimensioned such that, averaged over time, the particle is kept substantially in the same position (M1, M2) over each measurement block.