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    MAGNETIC FIELD MAP DETERMINATION IN A MR SYSTEM
    1.
    发明公开
    MAGNETIC FIELD MAP DETERMINATION IN A MR SYSTEM 审中-公开

    公开(公告)号：EP3451008A1

    公开(公告)日：2019-03-06

    申请号：EP17188159.2

    申请日：2017-08-28

    申请人： Siemens Healthcare GmbH

    发明人： Feiweier, Thorsten ,  Niederlöhner, Daniel

    IPC分类号： G01R33/44 ,  G01R33/30 ,  G01R33/565

    CPC分类号： G01R33/56563 ,  A61B5/055 ,  G01R33/243 ,  G01R33/246 ,  G01R33/307 ,  G01R33/443 ,  G01R33/4828 ,  G01R33/543 ,  G01R33/5608 ,  G01R33/5615 ,  G01R33/565 ,  G06T2207/10088 ,  G06T2207/30004

    摘要： A method and system for determining a magnetic field map in a MR system based on position of a movable patient support of the MR system are provided, wherein a first resulting field map including position dependent information about a magnetic field distribution in an homogeneity volume including an examination volume of the MR system is provided when the movable patient support is located at a first position, wherein a stationary field map including information about a magnetic field distribution in the homogeneity volume is provided, which is independent of the position of the movable patient support, wherein a position dependent field map including information about a magnetic field distribution in the homogeneity volume mainly influenced by a position of the movable patient support is determined using the stationary field map and the first resulting field map, and wherein a second resulting field map in the homogeneity volume is determined when the movable patient support is located at a second position different from the first position, using the stationary field map and the position dependent field map.

    EPT METHOD OF ELECTRIC CONDUCTIVITY RECONSTRUCTION WITH ENHANCED STABILITY AND SPEED
    2.
    发明公开
    EPT METHOD OF ELECTRIC CONDUCTIVITY RECONSTRUCTION WITH ENHANCED STABILITY AND SPEED 审中-公开
    具有改进的稳定性和速度EPT程序电导率重建

    公开(公告)号：EP3132277A1

    公开(公告)日：2017-02-22

    申请号：EP15715271.1

    申请日：2015-04-10

    申请人： Koninklijke Philips N.V.

    发明人： STEHNING, Christian ,  KATSCHER, Ulrich ,  STEHLE, Thomas Heiko

    IPC分类号： G01R33/44 ,  G01R33/56 ,  G01R33/24 ,  A61B5/053 ,  A61B5/055 ,  G06T7/00

    CPC分类号： G01R33/5608 ,  A61B5/0536 ,  A61B5/055 ,  G01R33/246 ,  G01R33/443

    摘要： An electric properties tomography method for reconstructing a spatial distribution of electric conductivity (σ) from magnetic resonance image data representative of a magnetic resonance image of at least a portion of a subject of interest (20), the spatial distribution covering at least a portion of the area of the magnetic resonance image, and the method comprising following steps: - segmenting the magnetic resonance image, - extrapolating acquired phase values, - replacing acquired phase values by the extrapolated phase values, - transforming into the frequency domain, - multiplying a frequency domain-transformed numerical second derivative by the acquired phase values and the frequency domain-transformed numerical second derivative by the extrapolated phase values, respectively, and - transforming the result of the multiplying into the spatial domain. Also covered are a corresponding MRI system and a software module.

    摘要翻译： 一个电特性断层摄影重建从磁共振代表的兴趣（20）的对象的至少一部分的磁共振图像的图像数据的电导率（σ）的空间分布的方法，所述空间分布覆盖的至少一部分 磁共振图像的区域，并且该方法包括以下步骤：-segmenting磁共振图像，-extrapolating获取的相位值，由推断相位值-replacing获取相位值，-transforming到频域，频-multiplying 由所获取的相位值域变换数值二阶导数和由所述外推的相位值，分别和变换该相乘的结果成空间域中的频域变换的数值的第二导数。 所以是一个涵盖相应的MRI系统和软件模块。

    Method for calculating local specific energy absorption rate (SAR) in nuclear magnetic resonance
    3.
    发明公开
    Method for calculating local specific energy absorption rate (SAR) in nuclear magnetic resonance 审中-公开
    Kernspinresonanz的Verfahren zum Berechnen der lokalspezifischen Energieaufnahmerate（SAR）

    公开(公告)号：EP2343567A1

    公开(公告)日：2011-07-13

    申请号：EP09181034.1

    申请日：2009-12-31

    申请人： Koninklijke Philips Electronics N.V. ,  Philips Intellectual Property & Standards GmbH

    发明人： Voigt, Tobias, R. ,  Katscher, Ulrich ,  Homann, Hanno, H.

    IPC分类号： G01R33/28 ,  G01R33/56 ,  G01R33/58

    CPC分类号： G01R33/288 ,  G01R33/246 ,  G01R33/443 ,  G01R33/543 ,  G01R33/546 ,  G01R33/5608

    摘要： A method for calculating a local specific energy absorption rate (SAR) on basis of an electric parameter and the mass density of a segmented geometry of an object and a magnetic field vector distribution of a radio frequency (RF) antenna. The values of the electric parameter and the mass density are pre-determined values, while the magnetic field vector distribution is estimated by a magnetic field mapping method based on a magnetic resonance (MR) scan. The magnetic field mapping method based on a magnetic resonance scan can be a B 1 mapping method.
    The invention also relates to a magnetic resonance system by means of which SAR calculation can be done in a relatively short period of time.
    The invention also relates to a computer program comprising instructions for calculating a local specific energy absorption rate (SAR) according to the above mentioned method.
    The SAR calculation used in the above mentioned method, system and program is done in the relatively short period of time and as such is practicable in a clinical setting.

    摘要翻译： 一种用于根据电参数和物体的分段几何形状的质量密度和射频（RF）天线的磁场矢量分布来计算局部比能吸收率（SAR）的方法。 电参数和质量密度的值是预定值，而磁场矢量分布通过基于磁共振（MR）扫描的磁场映射方法来估计。 基于磁共振扫描的磁场映射方法可以是B 1映射方法。 本发明还涉及一种磁共振系统，通过该系统可以在相对短的时间内进行SAR计算。 本发明还涉及一种包括根据上述方法计算局部比能吸收率（SAR）的指令的计算机程序。 上述方法，系统和程序中使用的SAR计算在相对较短的时间内完成，因此在临床环境中可行。

    A method and system for determining the flip angle in the transient phase of a gradient echo pulse sequence
    5.
    发明公开
    A method and system for determining the flip angle in the transient phase of a gradient echo pulse sequence 审中-公开
    Verfahren und System zur Bestimmung des Pulswinkels in derÜbergangsphaseeiner Gradientenechoimpulsfolge

    公开(公告)号：EP2511726A1

    公开(公告)日：2012-10-17

    申请号：EP11162302.1

    申请日：2011-04-13

    申请人： Klinikum rechts der Isar der Technischen Universität München

    发明人： Ganter, Carl

    IPC分类号： G01R33/58 ,  G01R33/44

    CPC分类号： G01R33/443 ,  G01R33/583 ,  G01R33/586

    摘要： A method for determining the flip angle distribution in magnetic resonance imaging involves the acquisition of the signal in the transient phase of an unbalanced steady state free precession (SSFP) sequence. The actual flip angle may be determined by measuring the frequency of the damped oscillatory component of the deviation from steady state. The method according to the present invention allows to perform fast and accurate B 1 mapping with little dependence on tissue parameters and a good robustness against noise.

    摘要翻译： 用于确定磁共振成像中的翻转角分布的方法涉及在不平衡稳态自由进动（SSFP）序列的瞬态相位中获取信号。 实际的翻转角可以通过测量阻尼振荡分量与稳态偏差的频率来确定。 根据本发明的方法允许执行快速且准确的B 1映射，几乎不依赖于组织参数和对噪声的良好鲁棒性。

    Measuring magnetic fields using NMR principles
    7.
    发明公开
    Measuring magnetic fields using NMR principles 失效
    使用NMR原理测量磁场

    公开(公告)号：EP0240221A3

    公开(公告)日：1988-09-14

    申请号：EP87302467

    申请日：1987-03-23

    申请人： KABUSHIKI KAISHA TOSHIBA

    发明人： Tsuzuki, Naohisa Toshiba Corp.

    IPC分类号： G01R33/24

    CPC分类号： G01R33/443 ,  G01R33/24 ,  G01R33/36

    摘要： An apparatus for measuring a magnetic field comprising: a nuclear magnetic resonance (NMR) probe (20) including a high frequency coil (21); a high frequency oscillator (16) connected to provide to the NMR probe coil (21) a high frequency signal. Bias coils (23, 24, 18) generate a bias magnetic field which is superimposed on the magnetic field to be measured. An ancillary magnetic field measuring device (25, 15) for provides an approximate measurement of the magnetic field to be measured and a computing circuit (100) computes on the basis of the approximate magnetic field measurement a frequency for the high frequency signal for the NMR probe coil (21) which should cause nuclear magnetic resonance. The output of the high frequency oscillator (16) accordingly. The bias current for the bias coils is varied over a predetermined range, and detector amplifier means (17) senses variations in inductance in the high frequency coil (21) due to nuclear magnetic resonance as the bias current is varied. The bias current which produces a maximum variation in inductance is determined and computing means (100) calculates the magnitude of the magnetic field to be measured from the determined maximum inductance variation incuding bias current and the frequency of the signal supplied to the NMR probe coil (21). The result is displayed on a display (102).

    Measuring magnetic fields using NMR principles
    8.
    发明公开
    Measuring magnetic fields using NMR principles 失效
    Messen von Magnetfeldern mittels magnetischer Kernresonanz-Prinzipien。

    公开(公告)号：EP0240221A2

    公开(公告)日：1987-10-07

    申请号：EP87302467.3

    申请日：1987-03-23

    申请人： KABUSHIKI KAISHA TOSHIBA

    发明人： Tsuzuki, Naohisa§Toshiba Corp.

    IPC分类号： G01R33/24

    CPC分类号： G01R33/443 ,  G01R33/24 ,  G01R33/36

    摘要： An apparatus for measuring a magnetic field comprising: a nuclear magnetic resonance (NMR) probe (20) including a high frequency coil (21); a high frequency oscillator (16) connected to provide to the NMR probe coil (21) a high frequency signal. Bias coils (23, 24, 18) generate a bias magnetic field which is superimposed on the magnetic field to be measured. An ancillary magnetic field measuring device (25, 15) for provides an approximate measurement of the magnetic field to be measured and a computing circuit (100) computes on the basis of the approximate magnetic field measurement a frequency for the high frequency signal for the NMR probe coil (21) which should cause nuclear magnetic resonance. The output of the high frequency oscillator (16) accordingly. The bias current for the bias coils is varied over a predetermined range, and detector amplifier means (17) senses variations in inductance in the high frequency coil (21) due to nuclear magnetic resonance as the bias current is varied. The bias current which produces a maximum variation in inductance is determined and computing means (100) calculates the magnitude of the magnetic field to be measured from the determined maximum inductance variation incuding bias current and the frequency of the signal supplied to the NMR probe coil (21). The result is displayed on a display (102).

    摘要翻译： 一种用于测量磁场的装置，包括：包括高频线圈（21）的核磁共振（NMR）探针（20）; 连接到高频振荡器（16）以向NMR探针线圈（21）提供高频信号。 偏置线圈（23,24,18）产生叠加在要测量的磁场上的偏置磁场。 一种用于提供要测量的磁场的近似测量的辅助磁场测量装置（25,15），并且计算电路（100）基于近似磁场测量来计算用于NMR的高频信号的频率 应该引起核磁共振的探针线圈（21）。 因此，高频振荡器（16）的输出。 偏置线圈的偏置电流在预定范围内变化，并且当偏置电流变化时，检测器放大器装置（17）由于核磁共振而感测高频线圈（21）中的电感的变化。 确定产生电感最大变化的偏置电流，并且计算装置（100）根据确定的最大电感变化（包括偏置电流）和提供给NMR探针线圈的信号的频率来计算要测量的磁场的大小 21）。 结果显示在显示器（102）上。

    MAGNETIC RESONANCE IMAGING SYSTEM
    9.
    发明公开
    MAGNETIC RESONANCE IMAGING SYSTEM 审中-公开

    公开(公告)号：EP4382945A1

    公开(公告)日：2024-06-12

    申请号：EP22212192.3

    申请日：2022-12-08

    申请人： Koninklijke Philips N.V.

    发明人： RAHMER, Juergen Erwin ,  GLEICH, Bernhard ,  NIELSEN, Tim ,  KOKEN, Peter

    IPC分类号： G01R33/28 ,  G01R33/341 ,  G01R33/565 ,  G01R33/563 ,  G01R33/44 ,  G01R33/3415

    CPC分类号： G01R33/341 ,  G01R33/3415 ,  G01R33/56509 ,  G01R33/56308 ,  G01R33/286 ,  G01R33/443

    摘要： The invention relates to a magnetic resonance imaging (MRI) system 1 comprising a magnet unit 4 that carries out an MRI sequence for generating MRI signals of a patient 2, excites a resonator device 8, 38 attached to the patient or to an object not being the patient and comprising a resonator element having piezoelectric properties and a coil element connected to the resonator element, and receives resonator device signals from the resonator device. A processor 5 reconstructs an MR image of the patient based on the MRI signals and determines a property of the patient or the object, to which the resonator device is attached, based on the received resonator device signals. This allows determining the property of the patient or the object by the MRI system without necessarily requiring, besides the resonator device, additional hardware, i.e. the property can be determined without requiring sophisticated additional hardware.