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Method for increment of RF-phase based on static magnetic field inhomogeneity in MRI apparatus

机译:磁共振成像装置中基于静磁场不均匀性增加射频相位的方法

摘要

In order to reduce image quality deterioration due to static magnetic field inhomogeneity according to imaging conditions without increasing an operator workload, shimming current where static magnetic field inhomogeneity of a selected region is reduced is calculated, shimming is performed for the selected region using the calculated local Bo shimming current, and then an increment (RF-Phase) in an irradiation phase of an RF pulse that excites the selected region in a state where static magnetic field inhomogeneity of the selected region is reduced or a post-adjustment excitation frequency (f0′) that is an excitation frequency is calculated. These increments (RF-Phase) in an irradiation phase and post-adjustment excitation frequency (f0′) that is an excitation frequency correspond with each other in amount.
机译:为了在不增加操作员工作量的情况下减少由于成像条件导致的由于静磁场不均匀引起的图像质量劣化,计算出减小了所选区域的静磁场不均匀性的匀场电流,使用计算出的局部来对所选区域进行匀场Bo匀场电流,然后在所选区域的静磁场不均匀性降低或调整后的激励频率(f0')的状态下激发所选区域的RF脉冲的辐射相位中的增量(RF-Phase) )即为激励频率。照射阶段中的这些增量(RF-Phase)和作为激发频率的调整后激发频率(f0')在数量上彼此对应。

著录项

  • 公开/公告号US9678184B2

    专利类型

  • 公开/公告日2017-06-13

    原文格式PDF

  • 申请/专利权人 HITACHI LTD.;

    申请/专利号US201214365278

  • 申请日2012-12-12

  • 分类号G01V3/00;G01R33/3875;A61B5/055;G01R33/565;

  • 国家 US

  • 入库时间 2022-08-21 13:46:02

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