A fast magnetic resonance imaging method and system
A fast, imaging module technology, applied in the direction of measuring magnetic variables, measuring devices, instruments, etc., can solve the problems of reduced signal-to-noise ratio, broken gradient separation, time-consuming imaging, etc., and achieve the effect of increasing signal-to-noise ratio
Active Publication Date: 2015-08-19
SHENZHEN INST OF ADVANCED TECH
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The trueFISP sequence adopts a completely symmetrical gradient waveform, and the acquisition signal is S + and S - The result of complete signal superposition has a high signal-to-noise ratio, but its signal is affected by the uniformity of the main magnetic field. As TR increases, banding artifacts will occur, and the increase in magnetic field inhomogeneity will cause artifacts Intensified, seriously affecting image quality
In a two-echo steady-state sequence, the S + and S - The formed gradient echo signal is collected to obtain the free decay signal (FISP-FID: Fast Imaging with Steady Processing, Free Induction Decay) and the echo signal (FISP-echo), but because two signal, and in order to completely separate the two signals, the TR time is very long, and the imaging takes too much time, and the signal-to-noise ratio is also reduced due to the extension of TR. In addition, due to the S + and S coexist in the same TR time, the two signals need to be separated by an appropriate destruction gradient, otherwise, mutual interference will cause artifacts in the image
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[0033] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.
[0034] figure 1 A flowchart showing an embodiment of a fast magnetic resonance imaging method according to the present application, including:
[0035] Step 102: applying periodic radio frequency pulses to make the magnetization vector of the imaging region reach a steady state;
[0036] Step 104: Collect the free decay signal (FISP-FID) and the echo signal (FISP-echo) in the steady-state precession sequence alternately;
[0037] Step 106: Perform free attenuation signal imaging and T2 weighted imaging.
[0038] In this embodiment, periodic radio frequency pulses are used to make the magnetization vector of the imaging area reach a steady state, and the free decay signal (FISP-FID) and echo signal (FISP-echo) in the steady state precession sequence are collected alternately to realize free decay signal imaging and T2-weighted i...
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The invention discloses a fast magnetic resonance imaging method, which comprises the following steps of enabling a magnetization vector of an imaging area to reach a steady state by using periodic radio frequency pulses; alternately acquiring free attenuation signals and echo signals in a steady state procession sequence; and performing free attenuation signal imaging and T2-weighted imaging. The invention also discloses a fast magnetic resonance imaging system. According to the specific embodiment of the invention, the free attenuation signals and the echo signals in the steady state procession sequence are alternately acquired, so that the signal to noise ratio of the acquired signals can be effectively increased, and the sensitivity of the sequence to motions can be reduced.
Description
technical field [0001] The present application relates to a magnetic resonance imaging technology, in particular to a fast magnetic resonance imaging method and system. Background technique [0002] In magnetic resonance imaging, a steady-state precession sequence can be formed as long as radio frequency pulses are applied periodically with the same dephasing angle in each cycle. If the cycle time is less than the T2 decay time, the transverse magnetization vector does not disappear completely at the end of the cycle, and it will continue to the next cycle, forming a coherent steady-state sequence. Since the coherent steady-state sequence can obtain a high signal-to-noise ratio in a short acquisition time, it has become an important branch of the fast MRI sequence. At present, the main coherent steady-state sequences include equilibrium steady-state free precession sequences (Siemens:trueFISP, GE:FIESTA), double-echo steady-state sequences (Siemens:DESS) and so on. [0003...
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IPC IPC(8): G01R33/561G01R33/565
Inventor 钟耀祖朱燕杰刘新郑海荣
Owner SHENZHEN INST OF ADVANCED TECH