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    METHOD AND MRI SYSTEM FOR CALCULATING AT LEAST ONE OPTIMIZED INITIAL B1-SHIM FOR A MAGNETIC RESONANCE MEASUREMENT
    1.
    发明公开
    METHOD AND MRI SYSTEM FOR CALCULATING AT LEAST ONE OPTIMIZED INITIAL B1-SHIM FOR A MAGNETIC RESONANCE MEASUREMENT 审中-公开

    公开(公告)号：EP4431970A1

    公开(公告)日：2024-09-18

    申请号：EP24162192.9

    申请日：2024-03-07

    申请人： Siemens Healthineers AG

    发明人： Herrler, Jürgen ,  Liebig, Patrick

    IPC分类号： G01R33/565 ,  G01R33/561 ,  G01R33/56

    CPC分类号： G01R33/5659 ,  G01R33/5612 ,  G01R33/5608

    摘要： The invention relates to a method for calculating a set of optimized initial B1-shims (12) for an MR measurement, wherein a B1-shim comprises a vector of complex B1-shim coefficients, each coefficient representing a scaling factor for one element of a multi-element transmit coil, the method comprising the steps of: (a) receiving a set of previously measured B1-maps (6) for one or several body parts of various test subjects, (b) calculating a set of B1-shims (8) for a plurality of different field-of-views in the one or several body part(s) by means of an optimization algorithm, (c) identifying which B1-shim has the best performance for a group (35) of field-of-views by using the previously measured B1-maps, and (d) optimizing the B1-shim for that group of field-of-views to obtain an optimized initial B1-shim (12)p. The invention also relates to a computer program, a B1 shim design unit, a control unit and an MRI system.

    COMPUTING SYSTEM FOR PROVIDING A MAPPING OF A PHYSICAL QUANTITY ON A BIOLOGICAL TISSUE AND METHOD THEREOF
    2.
    发明公开
    COMPUTING SYSTEM FOR PROVIDING A MAPPING OF A PHYSICAL QUANTITY ON A BIOLOGICAL TISSUE AND METHOD THEREOF 审中-公开

    公开(公告)号：EP4431968A1

    公开(公告)日：2024-09-18

    申请号：EP23162592.2

    申请日：2023-03-17

    申请人： Siemens Healthineers AG ,  King's College London

    发明人： Dubiner, Michael ,  Hajnal, Joseph V. ,  Malik, Shaihan ,  Neji, Radhouene ,  Tomi-Tricot, Raphael

    IPC分类号： G01R33/56 ,  G01R33/24 ,  G01R33/561 ,  G06N3/02

    CPC分类号： G01R33/5608 ,  G01R33/246 ,  G01R33/5612 ,  G06N20/20

    摘要： A computing system (100) for providing a mapping of a physical quantity on a biological tissue, comprising: an input data interface (10), configured to obtain data from the physical quantity on different spatial points of the biological tissue; a computation module (20), having at least: (a) a digitization unit (220), configured to produce a digitized representation of the biological tissue in voxels and/or pixels, wherein, based on the obtained data, a subset of the voxels and/or pixels is assigned a value of the physical quantity; (b) a concatenation unit (230), configured to spatially correlate the voxels and/or pixels of the produced digitized representation of the biological tissue; and (c) a regression unit (240), configured to process the information of the spatially correlated voxels and/or pixels and generate a regression analysis of the physical quantity on the biological tissue; and an output data interface (30), configured to, based on the generated regression analysis, provide a mapping of the physical quantity on the biological tissue, wherein a value of the physical quantity is assigned to each voxel and/or pixel.

    MAGNETIC RESONANCE IMAGING APPARATUS AND CHEMICAL-SHIFT PEAK DETECTION METHOD
    7.
    发明公开
    MAGNETIC RESONANCE IMAGING APPARATUS AND CHEMICAL-SHIFT PEAK DETECTION METHOD 审中-实审

    公开(公告)号：EP4403946A1

    公开(公告)日：2024-07-24

    申请号：EP24152358.8

    申请日：2024-01-17

    申请人： Canon Medical Systems Corporation

    发明人： TAKI, Sotaro ,  TOMIHA, Sadanori ,  YUI, Masao

    IPC分类号： G01R33/48 ,  G01R33/54 ,  G01R33/56 ,  G01R33/565

    CPC分类号： G01R33/5605 ,  G01R33/5601 ,  G01R33/4828 ,  G01R33/4804 ,  G01R33/5608 ,  G01R33/56563 ,  G01R33/543

    摘要： An MRI apparatus (100) according to one embodiment includes an obtaining unit (136) obtains information about a contrast agent containing substances with mutually different chemical shifts; a determiner unit (138) determines, based on the information, a frequency band related to a decrease in a MR signal due to the chemical shifts; an acquirer unit (121) acquires, prior to contrast enhancement using the contrast agent, a first MR signal group in the frequency band by CEST imaging under different saturation pulse conditions; and acquire, after the contrast enhancement using the contrast agent, a second MR signal group in the frequency band by CEST imaging under different saturation pulse conditions; a calculator unit (140) calculates a difference between a first Z-spectrum generated based on the first MR signal group and a second Z-spectrum generated based on the second MR signal group; and a detector unit (142) detects, from the difference, peaks indicating the decrease in the MR signal due to the chemical shifts of the substances