Magnetic resonance fingerprinting imaging method with variable number of echoes

A computer-implemented magnetic resonance fingerprinting imaging method with variable number of echoes, wherein, comprising the following steps:

• (1) designing and generating a magnetic resonance fingerprinting imaging sequence based on variable number of echoes according to a required quantitative tissue parameters and system parameters, the tissue parameters comprise longitudinal relaxation time T1 and transverse relaxation time T2*, the system parameters comprise main magnetic field inhomogeneity B0 and RF magnetic field (radio frequency magnetic field) B1+;
• (2) importing the magnetic resonance fingerprinting imaging sequence into a magnetic resonance scanner, scanning a subject to obtain the original k-space data;
• (3) reconstructing the original k-space data to obtain a series of images;
• (4) giving a required quantitative dynamic variation range and discretization step of tissue parameters and system parameters, a dictionary reflecting the temporal variation of echo signal is established based on Bloch equation;
• (5) matching the temporal variation signal of each pixel of the reconstructed images in step (3) with the echo signal in the dictionary one by one, so as to obtain the specific tissue parameter values for each pixel, and then obtain the quantitative image of the above tissue parameters and system parameters;
• (6) saving the quantitative image of the above tissue parameters and system parameters in a database for viewing.