Patent ID: 11927659
Assignee: ZHEJIANG UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A method for frequency drift correction of magnetic resonance CEST imaging, comprising the following steps:
S1, controlling a CEST imaging system to emit a radio-frequency pulse with a flip angle less than 90° to excite a target slice;
S2, after the radio-frequency pulse is sent out, acquiring a single line of free induction decay signals and implementing step S21, or acquiring a line of non-phase encoding gradient echo signals at two different times respectively and implementing step S22;
S21, dividing the acquired free induction decay signals into odd-numbered lines and even-numbered lines, and dividing an inter-line phase difference between the odd-numbered lines and the even-numbered lines by a sampling period to obtain a value of a main magnetic field frequency drift;
S22, dividing the phase difference of the acquired two lines of non-phase encoding gradient echo signals by a signal acquisition time difference therebetween to obtain the value of the main magnetic field frequency drift;
S3, adjusting a center frequency of a magnetic resonance device in real time according to the obtained value of the main magnetic field frequency drift.