Method for optimizing radio frequency impulse phases in fast spin echo impulse sequence

A spin echo and pulse sequence technology, which is applied in the direction of using magnetic variable measurement, using nuclear magnetic resonance imaging system for measurement, magnetic resonance measurement, etc. Influence and improve the effect of optimization efficiency

Active Publication Date: 2013-09-04
EAST CHINA NORMAL UNIV +1
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Problems solved by technology

Therefore, it often takes a long time to optimize the phase of the FSE sequence inversion pulse

Method used

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  • Method for optimizing radio frequency impulse phases in fast spin echo impulse sequence
  • Method for optimizing radio frequency impulse phases in fast spin echo impulse sequence
  • Method for optimizing radio frequency impulse phases in fast spin echo impulse sequence

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with accompanying drawing and embodiment:

[0019] figure 1 It is a structural block diagram of the MRI system of the present invention. In the MRI system, the magnet 101 has a cavity for placing a sample. A gradient coil 102 is placed around the cavity for generating gradient magnetic fields in the layer selection direction, phase encoding direction and reading direction, so as to spatially position the sample. A radio frequency transmitting coil 103 and a radio frequency receiving coil 104 are placed around the cavity, the transmitting coil is used to transmit radio frequency pulses to excite the magnetization vector of the sample, and the receiving coil is used to receive the magnetization vector precession signal. The gradient coil 102 is connected to a gradient power amplifier 112 , and the transmitting coil 103 and receiving coil 104 are respectively connected to a radio frequency power amplifi...

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Abstract

The invention provides a method for optimizing radio frequency impulse phases in a fast spin echo impulse sequence. According to the method, a spin echo and an excited echo are separated through the difference of effects of the spin echo and the excited echo according to spoiled gradients so as to ensure that the spin echo coincide with the excited spin echo more accurately; an optimized inversion impulse phase can be acquired through simple calculation according to the phase relation of the spin echo and an inversion impulse and the relation of the excited echo and the inversion impulse. The method for optimizing the radio frequency impulse phases in the fast spin echo impulse sequence can reduce the affect of unsatisfactory factors of instrument hardware on an FSE sequence parameter optimization process and the degree of dependence of the optimal parameter searching process on the phase step precisions, and therefore optimizing efficiency is improved.

Description

technical field [0001] The invention relates to a method for optimizing the phase of a radio frequency pulse in a fast spin echo pulse sequence, belonging to the technical field of magnetic resonance imaging. Background technique [0002] Magnetic resonance imaging (MRI) technology has become a very useful tool in medical diagnosis. Usually, in an MRI instrument, when the sample to be tested (such as human tissue) is placed in a static magnetic field B 0 (B 0 direction is defined as the Z-axis direction of the Cartesian coordinate system), when the equilibrium is reached in the sample, the nuclei (nuclear spin) in the sample are due to the B 0 Polarized to produce a macroscopic magnetization vector M 0 . m 0 Under the excitation of radio frequency pulses, it is rotated to the horizontal plane (XY plane), and then precesses around the Z axis. A receiving coil is placed around the tested sample, and it will induce the precession signal of the magnetization vector. After...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/54G01R33/56
Inventor 宁瑞鹏李钰胡彦杨光谢海滨
Owner EAST CHINA NORMAL UNIV
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