A Magnetic Resonance Imaging Method Using Steady-State Free Precession Sequence

Abstract

The invention provides a magnetic resonance imaging method based on a steady-state free procession sequence and belongs to the technical field of magnetic resonance imaging. The magnetic resonance imaging method based on the steady-state free procession sequence comprises the steps that excitation pulses and a first-level selection gradient A are applied at the same time; a second-level selection gradient B and a first phase encoding gradient U are applied, and a phase pre-dispersing gradient J is read; a first reading gradient G is applied, and an echo horizontal-movement signal is acquired at the same time; a third-level selection gradient D is applied; a second reading gradient H is applied, and a time reversed steady-state procession signal is acquired at the same time; a reading back-gathering gradient F, a second phase encoding gradient V and a fourth-level selection gradient C are applied, wherein the moment of the gradient A, the moment of the gradient B, the moment of the gradient C and the moment of the gradient D meet the relation: MC=-MA / 2 and 2MB-MD=MA; a k space is filled with obtained signals, and Fourier transformation is conducted, so that a magnetic resonance image is obtained. According to the magnetic resonance imaging method based on the steady-state free procession sequence, the time reversed steady-state procession signal and the time reversed steady-state procession signal can be acquired at the same time, and imaging time is shortened.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to a magnetic resonance imaging method using a steady-state free precession sequence. Background technique [0002] Time-reversed Fast Imaging with Steady-state Precession, timereversed FISP, or PSIF, or Contrast Enhanced Fourier Acquired Steady state (CE-FAST) signal is a heavily T2-weighted gradient echo signal. Compared with the traditional T2-weighted signal based on fast spin echo, it has the advantages of fast acquisition speed and low selective absorption rate. [0003] Echo shift (Echo Shift, ES) signal is a heavy T2* weighted gradient echo signal, which has the characteristics of long echo time (Echo Time, TE) and is also very sensitive to phase changes, usually used in magnetic resonance Real-time monitoring fields such as temperature imaging. [0004] At present, the industry usually uses corresponding sequences to collect these two signals separately...

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the embodiments of the present invention is to provide a magnetic resonance imaging method using a steady-state free precession sequence to solve the problem in the prior art that the echo translation signal and the time-reversed steady-state precession signal cannot be collected simultaneously

Images