利索-全球专利检索

  1. 登录
  2. 注册
发明授权
CN107110938B 使用具有额外180度RF脉冲的自旋回波脉冲序列的磁共振指纹 失效 - 权利终止

使用具有额外180度RF脉冲的自旋回波脉冲序列的磁共振指纹
摘要：
本发明提供一种用于根据磁共振指纹技术从测量区(108)内的对象(118)采集磁共振数据的磁共振系统(100)。脉冲序列包括一连串脉冲序列重复(302、304)。每个脉冲序列重复具有从重复时间的分布选择的重复时间。每个脉冲序列重复包括从射频脉冲的分布选择的射频脉冲(306)。射频脉冲的分布使得磁自旋旋转到翻转角的分布，并且每个脉冲序列重复包括在从采样时间的分布选择的采样时间处的采样事件(310)。脉冲序列的每个脉冲序列重复包括在射频脉冲与采样事件之间的第一时间中点处执行的第一180度RF脉冲(308)，以将磁共振信号重聚焦。脉冲序列的每个脉冲序列重复包括在采样事件与接下来的脉冲重复的开始之间的第二时间中点处执行的第二180度RF脉冲(309)。
摘要（英）：

The invention provides for a magnetic resonance system (100) for acquiring a magnetic resonance data from a subject (118) within a measurement zone (108) according to a magnetic resonance fingerprinting technique. The pulse sequence comprises a train of pulse sequence repetitions (302, 304). Each pulse sequence repetition has a repetition time chosen from a distribution of repetition times. Each pulse sequence repetition comprises a radio frequency pulse (306) chosen from a distribution of radio frequency pulses. The distribution of radio frequency pulses cause magnetic spins to rotate to a distribution of flip angles, and each pulse sequence repetition comprises a sampling event (310) at a sampling time chosen from a distribution of sampling times. Each pulse sequence repetition of the pulse sequence comprises a first 180 degree RF pulse (308) performed at a first temporal midpoint between the radio frequency pulse and the sampling event to refocus the magnetic resonance signal. Each pulse sequence repetition of the pulse sequence comprises a second 180 degree RF pulse (309) performed at a second temporal midpoint between the sampling event and the start of the next pulse repetition.

公开/授权文献
0/0