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1. 发明授权

US11733329B2 B 有权
公开(公告)号：US11733329B2
公开(公告)日：2023-08-22
申请号：US17390985
申请日：2021-08-01
申请人： ETH Zurich , UNIVERSITAET ZUERICH
发明人： David Brunner , Simon Gross , Klaas Pruessmann
IPC分类号： G01R33/3873 , G01R33/38 , G01R33/54
CPC分类号： G01R33/3873 , G01R33/3804 , G01R33/543
摘要： A magnetic resonance (MR) apparatus comprises magnet means for generating a main magnetic field in a sample region, encoding means for generating encoding magnetic fields superimposed to the main magnetic field, RF transmitter means for generating MR radiofrequency fields, driver means for operating said encoding means and RF transmitter means to generate superimposed time dependent encoding fields and radiofrequency fields according to an MR sequence for forming images or spectra; and acquisition means for acquiring an MR signal from said object. The magnet means comprise a primary magnetic field source providing a static magnetic field B0 and at least one secondary magnetic field source providing an adjustable magnetic field B′. To provide improved shimming, the secondary magnetic field source comprises at least two spatially distinct portions of a first magnetic material and of a second magnetic material, respectively, said first magnetic material having a first magnetic moment density m1 and said second magnetic material having a second magnetic moment density m2, and means for independently adjusting said second magnetic moment density m2 by variation of an external control parameter.

2. 发明申请

US20220018921A1 B0 SHIMMING DEVICE FOR MRI 有权
公开(公告)号：US20220018921A1
公开(公告)日：2022-01-20
申请号：US17390985
申请日：2021-08-01
申请人： ETH Zurich , UNIVERSITAET ZUERICH
发明人： David Brunner , Simon Gross , Klaas Pruessmann
IPC分类号： G01R33/3873 , G01R33/38 , G01R33/54
摘要： A magnetic resonance (MR) apparatus comprises magnet means for generating a main magnetic field in a sample region, encoding means for generating encoding magnetic fields superimposed to the main magnetic field, RF transmitter means for generating MR radiofrequency fields, driver means for operating said encoding means and RF transmitter means to generate superimposed time dependent encoding fields and radiofrequency fields according to an MR sequence for forming images or spectra; and acquisition means for acquiring an MR signal from said object. The magnet means comprise a primary magnetic field source providing a static magnetic field B0 and at least one secondary magnetic field source providing an adjustable magnetic field B′. To provide improved shimming, the secondary magnetic field source comprises at least two spatially distinct portions of a first magnetic material and of a second magnetic material, respectively, said first magnetic material having a first magnetic moment density m1 and said second magnetic material having a second magnetic moment density m2, and means for independently adjusting said second magnetic moment density m2 by variation of an external control parameter.

3. 发明申请

US20190235036A1 B0 SHIMMING DEVICE FOR MRI 审中-公开
公开(公告)号：US20190235036A1
公开(公告)日：2019-08-01
申请号：US16083973
申请日：2017-01-17
申请人： ETH ZURICH , UNIVERSITAET ZUERICH
发明人： David Brunner , Simon Gross , Klaas Pruessmann
IPC分类号： G01R33/3873 , G01R33/38 , G01R33/54
CPC分类号： G01R33/3873 , G01R33/3804 , G01R33/543
摘要： A magnetic resonance (MR) apparatus comprises magnet means for generating a main magnetic field in a sample region, encoding means for generating encoding magnetic fields superimposed to the main magnetic field, RF transmitter means for generating MR radiofrequency fields, driver means for operating said encoding means and RF transmitter means to generate superimposed time dependent encoding fields and radiofrequency fields according to an MR sequence for forming images or spectra; and acquisition means for acquiring an MR signal from said object. The magnet means comprise a primary magnetic field source providing a static magnetic field B0 and at least one secondary magnetic field source providing an adjustable magnetic field B′. To provide improved shimming, the secondary magnetic field source comprises at least two spatially distinct portions of a first magnetic material and of a second magnetic material, respectively, said first magnetic material having a first magnetic moment density m1 and said second magnetic material having a second magnetic moment density m2, and means for independently adjusting said second magnetic moment density m2 by variation of an external control parameter.

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