Automatic calculation of trigger delay for triggered magnetic resonance imaging sequence

摘要

The magnetic resonance (MR) imaging device 10 repeatedly executes a navigator pulse sequence 40 to generate navigator data in image space as a function of time and moves with a physiological cycle (eg, respiration) as a function of time. An anatomical feature motion signal 44 is extracted from the navigator data. A simultaneous physiological signal 16 as a function of time is generated by the physiological monitors 12, 14 concurrently with the repetition of the navigator pulse sequence. The gating time offset 50 is determined by comparing the motion signal of the anatomical feature as a function of time and the simultaneous physiological signal as a function of time. The MR imaging device performs a prospective or retrospective synchronized MR imaging sequence 36 using a gating time defined as the time of occurrence of the gating event detected by the physiological monitor modified by the gating time offset.