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    • 1. 发明申请
    • SYSTEM FOR ADJUSTING A MAGNETIC FIELD FOR MR AND OTHER USE
    • 用于调整磁场和其他用途的系统
    • US20100127702A1
    • 2010-05-27
    • US12577644
    • 2009-10-12
    • Andreas GreiserRenate JerecicPeter KellmanSaurabh ShahPeter WealeSven Zuehlsdorff
    • Andreas GreiserRenate JerecicPeter KellmanSaurabh ShahPeter WealeSven Zuehlsdorff
    • G01R33/48
    • G01R33/3875G01R33/4828G01R33/543G01R33/56563G01R33/5673
    • An MR magnetic field inhomogeneity compensation system acquires multiple MR data sets representing luminance intensity values of individual image elements comprising corresponding multiple different image versions of at least a portion of a first imaging slice of patient anatomy including fat and water components. The compensation system employs the multiple MR data sets in solving corresponding multiple simultaneous nonlinear equations to calculate local frequency offset associated with magnetic field inhomogeneity at the individual image element location, for an individual image element of the image elements. The local frequency offset comprises a difference between proton spin frequency at the location and a nominal proton spin frequency. The compensation system derives data representing an electrical signal to be applied to magnetic field generation coils to substantially compensate for determined offset frequencies at the plurality of individual locations. A magnetic field generation coil generates a magnetic field in response to applying the electrical signal to substantially compensate for the magnetic field inhomogeneity at the individual image element location.
    • MR磁场不均匀性补偿系统获取多个MR数据集,其表示包括脂肪和水分量的患者解剖结构的第一成像切片的至少一部分的相应多个不同图像形式的各个图像元素的亮度强度值。 补偿系统采用多个MR数据集来解决相应的多个同时非线性方程,以计算与图像元素的单个图像元素相关联的与个体图像元素位置处的磁场不均匀性相关的局部频率偏移。 本地频率偏移包括位置处的质子自旋频率与标称质子自旋频率之间的差异。 补偿系统导出表示要施加到磁场产生线圈的电信号的数据,以基本上补偿多个单独位置处的确定的偏移频率。 磁场产生线圈响应于施加电信号而产生磁场,以基本上补偿各个图像元件位置处的磁场不均匀性。
    • 2. 发明授权
    • System for adjusting a magnetic field for MR and other use
    • 用于MR调整磁场的系统及其他用途
    • US08138759B2
    • 2012-03-20
    • US12577644
    • 2009-10-12
    • Andreas GreiserRenate JerecicPeter KellmanSaurabh ShahPeter WealeSven Zuehlsdorff
    • Andreas GreiserRenate JerecicPeter KellmanSaurabh ShahPeter WealeSven Zuehlsdorff
    • G01V3/00
    • G01R33/3875G01R33/4828G01R33/543G01R33/56563G01R33/5673
    • An MR magnetic field inhomogeneity compensation system acquires multiple MR data sets representing luminance intensity values of individual image elements comprising corresponding multiple different image versions of at least a portion of a first imaging slice of patient anatomy including fat and water components. The compensation system employs the multiple MR data sets in solving corresponding multiple simultaneous nonlinear equations to calculate local frequency offset associated with magnetic field inhomogeneity at the individual image element location, for an individual image element of the image elements. The local frequency offset comprises a difference between proton spin frequency at the location and a nominal proton spin frequency. The compensation system derives data representing an electrical signal to be applied to magnetic field generation coils to substantially compensate for determined offset frequencies at the plurality of individual locations. A magnetic field generation coil generates a magnetic field in response to applying the electrical signal to substantially compensate for the magnetic field inhomogeneity at the individual image element location.
    • MR磁场不均匀性补偿系统获取多个MR数据集,其表示包括脂肪和水分量的患者解剖结构的第一成像切片的至少一部分的相应多个不同图像形式的各个图像元素的亮度强度值。 补偿系统采用多个MR数据集来解决相应的多个同时非线性方程,以计算与图像元素的单个图像元素相关联的与个体图像元素位置处的磁场不均匀性相关的局部频率偏移。 本地频率偏移包括位置处的质子自旋频率与标称质子自旋频率之间的差异。 补偿系统导出表示要施加到磁场产生线圈的电信号的数据,以基本上补偿多个单独位置处的确定的偏移频率。 磁场产生线圈响应于施加电信号而产生磁场,以基本上补偿各个图像元件位置处的磁场不均匀性。
    • 3. 发明申请
    • System for Dynamically Compensating for Inhomogeneity in an MR Imaging Device Magnetic Field
    • 用于动态补偿MR成像装置磁场中的不均匀性的系统
    • US20100019766A1
    • 2010-01-28
    • US12481649
    • 2009-06-10
    • Sven ZuehlsdorffPeter WealeSaurabh ShahAndreas Greiser
    • Sven ZuehlsdorffPeter WealeSaurabh ShahAndreas Greiser
    • G01R33/44
    • G01R33/3875G01R33/243G01R33/5614
    • A system automatically dynamically compensates for inhomogeneity in an MR imaging device magnetic field. An MR imaging compensation system applies swept frequency magnetic field variation in determining an estimate of proton spin frequency at multiple individual locations associated with individual image elements in an anatomical volume of interest and substantially independently of tissue associated relaxation time. For the multiple individual locations, the system determines an offset frequency comprising a difference between a determined estimate of proton spin frequency associated with an individual image element location and a nominal proton spin frequency. The system derives data representing an electrical signal to be applied to magnetic field generation coils to substantially compensate for determined offset frequencies at the multiple individual locations. An MR magnetic field coil generates a magnetic field in response to applying the electrical signal to substantially compensate for magnetic field variation represented by the determined offset frequencies at the multiple individual locations.
    • 系统自动动态补偿MR成像装置磁场的不均匀性。 MR成像补偿系统应用扫描频率磁场变化来确定在感兴趣的解剖体积中与各个图像元素相关联的多个单独位置处的质子旋转频率的估计,并且基本上独立于组织相关的弛豫时间。 对于多个单独位置,系统确定偏移频率,该偏移频率包括与单个图像元素位置相关联的质子自旋频率的确定估计与标称质子旋转频率之间的差异。 系统导出表示要施加到磁场产生线圈的电信号的数据,以基本上补偿多个单独位置处的确定的偏移频率。 MR磁场线圈响应于施加电信号而产生磁场,以基本上补偿由多个单独位置处确定的偏移频率所表示的磁场变化。
    • 10. 发明授权
    • Method and control device to operate a magnetic resonance system
    • 用于操作磁共振系统的方法和控制装置
    • US08379946B2
    • 2013-02-19
    • US12774278
    • 2010-05-05
    • Andreas GreiserSaurabh Shah
    • Andreas GreiserSaurabh Shah
    • G06K9/00
    • G01R33/54A61B5/055G01R33/543G01R33/58
    • In a method of a magnetic resonance system and a method and computer-readable storage medium for the operation thereof to acquire magnetic resonance image data of an examination subject, wherein magnetic resonance system has a number of subsystems and a control device, a number of adjustment measurements to adjust at least one subsystem for making a medical diagnostic data acquisition are implemented through the control device. In these adjustment measurements, an adjustment volume associated with the appertaining adjustment measurement is taken into account that encompasses at least one region of a body containing the examination subject. For this purpose, markings established by the control device within image data of the examination subject and characterizing the spatial occupation (position and orientation) and/or a dimension of the examination subject are determined. Based on these markings the spatial occupation and extent of an adjustment volume for an adjustment measurement are determined automatically by the control device.
    • 在磁共振系统的方法和方法和计算机可读存储介质中,其用于获取检查对象的磁共振图像数据,其中磁共振系统具有多个子系统和控制装置,多个调整 通过控制装置实现用于调整用于进行医疗诊断数据采集的至少一个子系统的测量。 在这些调整测量中,考虑与包含检查对象的身体的至少一个区域相关联的调整量调整量。 为此目的,确定由检查对象的图像数据中的控制装置建立的并且表征空间占用(位置和方向)和/或检查对象的维度的标记。 基于这些标记,调节测量的调节量的空间占用和范围由控制装置自动确定。