发明授权
US07960971B2 Method and magnetic resonance system for determining the flip angle distribution in a volume of an examination subject 有权
用于确定检查对象体积中的翻转角分布的方法和磁共振系统

  • 专利标题: Method and magnetic resonance system for determining the flip angle distribution in a volume of an examination subject
  • 专利标题(中): 用于确定检查对象体积中的翻转角分布的方法和磁共振系统
  • 申请号: US12358546
    申请日: 2009-01-23
  • 公开(公告)号: US07960971B2
    公开(公告)日: 2011-06-14
  • 发明人: Thorsten Feiweier
  • 申请人: Thorsten Feiweier
  • 申请人地址: DE Munich
  • 专利权人: Siemens Aktiengesellschaft
  • 当前专利权人: Siemens Aktiengesellschaft
  • 当前专利权人地址: DE Munich
  • 代理机构: Schiff Hardin LLP
  • 优先权: DE102005049229 20051014
  • 主分类号: G01V3/00
  • IPC分类号: G01V3/00
Method and magnetic resonance system for determining the flip angle distribution in a volume of an examination subject
摘要:
In a method for determination of flip angle distributions for various antenna transmission configurations in a magnetic resonance system, magnetic resonance measurements are implemented with the various transmission configurations, with the reception configuration being identical for all implemented magnetic resonance measurements, and all magnetic resonance measurements for the various transmission configurations are implemented with a specific pulse sequence. This pulse sequence is selected such that the total function that describes the dependency of the image signal at a specific location on the flip angle achieved at this location with the radiated radio-frequency field, as well as on further MR-relevant parameters, can be factored into a first sub-function that describes the dependency of the image signal on the achieved flip angle and a second sub-function (Tb) that describes the dependency of the image signal on the further MR-relevant parameters, and such that the functional dependency of the image signal on the achieved flip angle is known. The absolute flip angle distribution is measured for a reference transmission configuration, and the flip angle distributions of the other transmission configurations are then respectively determined on the basis of the absolute flip angle distribution of the reference transmission configuration and on the basis of the ratio of the spatially-dependent image signals of the magnetic resonance measurements of the respective transmission configuration to the corresponding spatially-dependent image signals of the magnetic resonance measurement of the reference transmission configuration.
信息查询
0/0